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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 1688. Отображено 100.
05-01-2012 дата публикации

Adaptive control of scr urea injection to compensate errors

Номер: US20120000189A1
Автор: Kevin Andrew Gady, Yu Sun, Yue-Yun Wang
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

A method for controlling a selective catalytic reduction injection system having a storage tank, a pump, a delivery line, and an injection nozzle includes monitoring the selective catalytic reduction injection system, determining a selective catalytic reduction injector system effective area ratio, comparing the selective catalytic reduction injector system effective area ratio to a threshold, calculating a compensation factor upon surpassing the threshold, and modifying the commanded injected mass according to the calculated compensation factor.

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Номер записи: 1
02-02-2012 дата публикации

System and method for processing nh3 slippage of a selective catalyst reduction system

Номер: US20120023907A1
Автор: Avra Brahma, Devesh Upadhyay
Принадлежит: FORD GLOBAL TECHNOLOGIES LLC

Systems and methods for storing NH 3 that has slipped through a first SCR are described. In one example, NH 3 is stored in a second SCR and released to the first SCR via desorption. The systems and method may reduce NH 3 consumption and increase NH 3 utilization within an exhaust system.

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Номер записи: 2
08-03-2012 дата публикации

Exhaust purification system of internal combustion engine

Номер: US20120055143A1
Автор: Daichi Imai, Hiromasa Nishioka, Kazuhiro Umemoto, Takamitsu Asanuma, Yuka Nakata
Принадлежит: Toyota Motor Corp

An exhaust purification system is provided with an NO x storage reduction catalyst arranged in an exhaust passage and an SO x trap material arranged upstream of the NO x storage reduction catalyst and removes SO x contained in exhaust gas. A main flow path has a secondary flow path connected to it. In the secondary flow path, a removal device is arranged for removing the sulfur constituent contained in fuel. The secondary flow path includes an opening and closing device. When the SO x removal rate of the SO x trap material becomes a predetermined removal rate judgment value or less or the concentration of the SO x which flows into the SO x trap material becomes a predetermined concentration judgment value or more, at least part of the fuel flowing through a main flow path is made to flow into the secondary flow path and run through the removal device.

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Номер записи: 3
05-04-2012 дата публикации

Particulate filter ash loading prediction method and vehicle using same

Номер: US20120083967A1
Автор: Antonio Triana, Danan Dou, Ryan Nevin, Taner Tuken
Принадлежит: Deere and Co

A particulate filter ash loading prediction method including the steps of determining a service age for the particulate filter; calculating an ash accumulation rate in the particulate filter; determining a maximum service age for the particulate filter dependent upon the ash accumulation rate; and comparing the service age to the maximum service age. If the service age exceeds the maximum service age then indicating that a service and/or replacement of the particulate filter is needed due to ash loading.

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Номер записи: 4
05-04-2012 дата публикации

Particulate filter ash loading prediction method and vehicle using same

Номер: US20120083990A1
Автор: Antonio Triana, Danan Dou, Ryan Nevin, Taner Tuken
Принадлежит: Deere and Co

A particulate filter ash loading prediction method including the steps of determining a maximum average time for the filter; performing a calculation of a running average of time between regenerations of the filter; calculating an end-of-service life ratio of the filter dependent upon the maximum average time and the running average. The method further includes the steps of determining a delta pressure adjustment factor to compensate for ash loading of the filter depending upon the end-of-service life ratio; and comparing the delta pressure adjustment factor to a predetermined maximum delta pressure value, and, if the delta pressure adjustment factor exceeds the predetermined maximum normalized delta pressure adjustment factor, then indicating that a service or replacement of the filter is needed due to the ash loading.

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Номер записи: 5
22-11-2012 дата публикации

Methods And System For Ash Detection In Exhaust Particulate Filter

Номер: US20120291419A1
Автор: Anthony C. Rodman, Michael A. Snopko, Rajesh N. Nair
Принадлежит: Caterpillar Inc

A method of detecting ash in an exhaust particulate filter system for an internal combustion engine includes transmitting electromagnetic energy through an exhaust particulate filter containing soot and ash, and sensing a strength of the transmitted electromagnetic energy after having been attenuated in response to the soot. The method further includes electronically storing a filter monitoring history responsive to a difference between the transmitted strength and the sensed strength of the electromagnetic energy, and detecting an amount of the ash based at least in part upon a pattern of electromagnetic energy attenuation defined by the stored filter monitoring history. An exhaust particulate filter system for implementing related methodology includes a microprocessor configured to determine a value indicative of an amount of ash contained within an exhaust particulate filter responsive to a pattern of electromagnetic energy attenuation defined by a stored filter monitoring history.

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Номер записи: 6
14-11-2013 дата публикации

Service test for exhaust gas treatment system

Номер: US20130298655A1
Автор: Janean E. Kowalkowski, John Coppola
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

A service procedure to test the SCR device involves turning on an upstream and downstream SCR NOx sensor, turning off an NH 3 injector, running the engine until enough upstream NOx mass has been generated by the engine to deplete any NH 3 load remaining in the SCR device, determining the operational status of the NOx sensors as follows: if 1−downstream NOx ppm/upstream NOx ppm=approx. 0; then the downstream NOx sensor is reading the same as the upstream NOx sensor and the downstream NOx sensor is determined to be good and the SCR device may have to be replaced; and if 1−downstream NOx ppm/upstream NOx ppm>approx. 0; then the downstream NOx sensor is reading high and the downstream NOx sensor is determined to be bad and downstream NOx sensor may have to be replaced.

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Номер записи: 7
06-02-2014 дата публикации

Method for operating an scr catalyic converter provided for the aftertreatment of exhaust gases of an internal combustion engine

Номер: US20140033682A1
Автор: Frank Schweizer
Принадлежит: ROBERT BOSCH GMBH

In a method for operating an SCR catalytic converter provided for the reduction of NOx in exhaust gases of an internal combustion engine, which SCR catalytic converter is operated with a reagent which can be stored in the SCR catalytic converter such that there is a certain reagent fill level in the SCR catalytic converter, wherein the actual NOx concentration downstream of the SCR catalytic converter is monitored on the basis of the signal of a sensor, which is arranged downstream of the SCR catalytic converter and which is sensitive at least with respect to NOx, in comparison with a calculated NOx concentration downstream of the SCR catalytic converter, it is provided according to the invention that, in the case of a comparison result which represents a conversion deficit as a difference between the measured actual NOx concentration and the previous calculated reagent fill level in the SCR catalytic converter is corrected to a new calculated reagent fill level, whereby an immediate dosing of reagent takes place.

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Номер записи: 8
02-01-2020 дата публикации

Compact Selective Catalytic Reduction System

Номер: US20200003099A1
Автор: Alexis Eden, Ben Reid, Dan Pierce, Hannah Petto, Leo Shead, Mark Kennedy, Ridwan KUREEMUN, Ronald Silver
Принадлежит: Perkins Engines Co Ltd

A selective catalytic reduction (SCR) system for treating exhaust gas from a diesel engine is provided, along with a method of assembling such a system. The system comprises a frame, a SCR catalyst contained within a SCR canister, and an ammonia oxidation catalyst contained within an ammonia oxidation canister. Each of the SCR and ammonia oxidation canisters is removably attached to the frame.

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Номер записи: 9
12-01-2017 дата публикации

CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

Номер: US20170009674A1
Автор: Nogawa Shinichiro
Принадлежит: TOYOTA JIDOSHA KABUSHIKI KAISHA

The control device executes transition control when the operating state of the air flow control valve is switched during implementation of the lean burn operation, and the NOx storage amount which is estimated is smaller than a determination value. According to the transition control, a combustion air-fuel ratio in a cycle of which an intake stroke overlaps a time period of switching the operating state of the air flow control valve is made fuel-leaner than the theoretical air-fuel ratio and fuel-richer than the predetermined air-fuel ratio. When the estimated value of the NOx storage amount is the determination value or more, rich spike is executed during a predetermined time period including the time period of switching the operating state of the air flow control valve. 1. A control device for an internal combustion engine having a NOx storage reduction catalyst disposed in an exhaust passage , and an air flow control valve that changes a velocity of an air flow generated in a cylinder , and capable of a lean burn operation by a predetermined air-fuel ratio that is fuel-leaner than a theoretical air-fuel ratio , comprising:at least one processor; andat least one memory including at least one computer program, the at least one computer program configured to cause the control device at least toexecute switching of an operating state of the air flow control valve;execute estimation of a NOx storage amount of the NOx storage reduction catalyst;execute transition control of making a combustion air-fuel ratio in a cycle of which an intake stroke overlaps a time period of switching the operating state of the air flow control valve, fuel-leaner than the theoretical air-fuel ratio and fuel-richer than the predetermined air-fuel ratio, when the operating state of the air flow control valve is switched during implementation of the lean burn operation, and the NOx storage amount which is estimated is smaller than a determination value; andexecute rich spike that makes a ...

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Номер записи: 10
14-01-2021 дата публикации

Control device for internal combustion engine

Номер: US20210010434A1
Автор: Kazuya Suzuki, Takahiko Fujiwara
Принадлежит: Toyota Motor Corp

A control device for the internal combustion engine is provided with a carbon dioxide concentration control part configured to cause a concentration of carbon dioxide in exhaust flowing into the filter to decrease when the temperature of the filter becomes a predetermined first temperature setting or more and less than a predetermined second temperature setting. The first temperature setting is made a temperature selected from a temperature band at which ash deposited on the filter can be made to be separate from the filter when the inside of the filter is in an atmosphere where the concentration of carbon dioxide is lower than when it is in an exhaust atmosphere. The second temperature setting is made a temperature set so as to prevent excessive temperature rise of the catalyst device.

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Номер записи: 11
18-01-2018 дата публикации

APPARATUS FOR PURIFYING EXHAUST GAS AND REGENERATION METHOD THEREOF

Номер: US20180016958A1
Автор: Jung Changho, KIM Pyung Soon
Принадлежит: HYUNDAI MOTOR COMPANY

A regeneration method of an apparatus of purifying an exhaust gas including a catalytic converter which is disposed on an exhaust pipe and includes a lean NOx trap (LNT) device in which a first LNT catalyst is coated and a catalyzed particulate filter (CPF) in which a second LNT catalyst is coated may include determining whether a nitrogen oxide (NOx) amount absorbed in the LNT device is greater than a threshold NOx amount, determining whether a temperature of the LNT device is higher than a first predetermined temperature when the NOx amount absorbed in the LNT device is greater than the threshold NOx amount, and regenerating, both of the LNT device and the CPF or only the LNT device according to a temperature of the CPF when the temperature of the LNT device is higher than the first predetermined temperature. 1. A regeneration method of an apparatus of purifying an exhaust gas including a catalytic converter which is disposed on an exhaust pipe and includes a lean NOx trap (LNT) device in which a first LNT catalyst is coated and a catalyzed particulate filter (CPF) in which a second LNT catalyst is coated , wherein the LNT device and the CPF are sequentially disposed in the catalytic converter , the regeneration method comprising:determining, by a controller, whether a nitrogen oxide (NOx) amount absorbed in the LNT device is greater than a threshold NOx amount;determining, by the controller, whether a temperature of the LNT device is higher than a first predetermined temperature when the NOx amount absorbed in the LNT device is greater than the threshold NOx amount; andregenerating, by the controller, both of the LNT device and the CPF or only the LNT device according to a temperature of the CPF when the temperature of the LNT device is higher than the first predetermined temperature.2. The regeneration method of claim 1 , wherein the regenerating both of the LNT device and the CPF or only the LNT device according to the temperature of the CPF comprises: ...

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Номер записи: 12
18-01-2018 дата публикации

EXHAUST EMISSION CONTROL SYSTEM OF ENGINE

Номер: US20180017002A1
Автор: Kanno Masanobu, Nishimura Hiroyuki, Tanimura Kenji
Принадлежит:

An exhaust emission control system of an engine is provided, which includes a NOcatalyst disposed in an exhaust passage for storing NOwithin exhaust gas when an air-fuel ratio of the exhaust gas is lean, and reducing the stored NOwhen the air-fuel ratio is approximately stoichiometric or rich. A processor executes a NOreduction controlling module for performing a NOreduction control in which a fuel injector performs a post injection to control the air-fuel ratio to a target ratio, and an EGR controlling module for controlling an EGR valve to recirculate EGR gas. In the NOreduction control, the EGR controlling module controls an opening of the EGR valve to a target opening smaller than when the NOreduction control is not performed. The NOreduction controlling module starts the control after the EGR valve opening is controlled to the target opening. 1. An exhaust emission control system of an engine , including a NOcatalyst disposed in an exhaust passage of the engine for storing NOwithin exhaust gas when an air-fuel ratio of the exhaust gas is lean , and reducing the stored NOwhen the air-fuel ratio is approximately stoichiometric or rich , the exhaust emission control system comprising a processor configured to execute:{'sub': x', 'x', 'x', 'x, 'a NOreduction controlling module for performing a NOreduction control in which a fuel injector performs a post injection of fuel to control the air-fuel ratio to a target air-fuel ratio so that the stored NOis reduced, the target air-fuel ratio being a ratio at which the stored NOis reducible; and'}an exhaust gas recirculation (EGR) controlling module for controlling an EGR valve disposed in an EGR passage connected to the exhaust passage and an intake passage of the engine, to recirculate EGR gas from the exhaust passage to the intake passage at a flow rate according to an operating state of the engine, wherein{'sub': x', 'x', 'x', 'x, 'when the NOreduction controlling module performs the NOreduction control, the EGR ...

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Номер записи: 13
21-01-2021 дата публикации

EXHAUST SYSTEM INCLUDING SCRF CATALYST WITH OXIDATION ZONE

Номер: US20210017889A1
Автор: BERGEAL David, BROWN GAVIN, HOUEL Valerie, WALTON MARK, WIJEMANNE Thilanka
Принадлежит:

Systems and methods of the present invention related to an exhaust gas purification system comprising: (a) a first injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas; (b) a diesel particulate filter including an inlet and an outlet, wherein the filter includes a selective catalyst reduction (SCR) catalyst and an oxidation catalyst; (c) a second injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas, located downstream of the filter; and (d) a downstream catalyst comprising a selective catalytic reduction catalyst, located downstream of the second injector. 1. An exhaust gas purification system comprising:a. a first injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas;b. a diesel particulate filter including an inlet and an outlet, wherein the filter includes a selective catalyst reduction (SCR) catalyst and an oxidation catalyst;c. a second injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas, located downstream of the filter; andd. a downstream catalyst comprising a selective catalytic reduction catalyst, located downstream of the second injector.2. The exhaust gas purification system of claim 1 , wherein the oxidation catalyst is coated on the outlet of the filter.3. The exhaust gas purification system of claim 1 , wherein the oxidation catalyst comprises one or more platinum group metals.4. The exhaust gas purification system of claim 1 , wherein the oxidation catalyst comprises platinum claim 1 , palladium claim 1 , or combinations thereof.5. The exhaust gas purification system of claim 1 , wherein the selective catalytic reduction catalyst comprises a metal oxide based SCR catalyst formulation claim 1 , a molecular sieve based SCR catalyst formulation claim 1 , or mixtures thereof.6. The exhaust gas purification system of claim 1 , wherein the downstream catalyst further comprises an ammonia oxidation catalyst.7. ...

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Номер записи: 14
25-01-2018 дата публикации

SYSTEM AND METHOD OF PURIFYING EXHAUST GAS

Номер: US20180023440A1
Автор: Cho Ji Ho, KIM Jong Hag
Принадлежит: HYUNDAI MOTOR COMPANY

A method of purifying exhaust gas may include predicting a slip probability of ammonia (NH3) to a rear end of a selective catalytic reduction on diesel particulate filter (SDPF), comparing the predicted ammonia slip probability with a slip probability of ammonia limiting operation of a low pressure-exhaust gas recirculation (LP-EGR) system, comparing an absorption amount of ammonia with a value obtained by multiplying an ammonia absorption target amount by a minimum target absorption amount ratio when the predicted ammonia slip probability is larger than the slip probability of ammonia limiting operation of the LP-EGR system, limiting the operation of the LP-EGR when the absorption amount of ammonia is not larger than the value obtained by multiplying an ammonia absorption target amount by a minimum target absorption amount ratio, and dosing a urea solution. 1. A method of purifying exhaust gas , comprising:predicting, by a controller, a slip probability of ammonia (NH3) to a rear end of a selective catalytic reduction on diesel particulate filter (SDPF);comparing, by the controller, the predicted ammonia slip probability with a slip probability of ammonia limiting operation of a low pressure-exhaust gas recirculation (LP-EGR) system;comparing, by the controller, an absorption amount of ammonia with a value obtained by multiplying an ammonia absorption target amount by a minimum target absorption amount ratio when the predicted ammonia slip probability is larger than the slip probability of ammonia limiting operation of the LP-EGR system;limiting, by the controller, the operation of the LP-EGR when the absorption amount of ammonia is not larger than the value obtained by multiplying an ammonia absorption target amount by a minimum target absorption amount ratio; anddosing a urea solution, by the controller.2. The method of claim 1 , further comprising:comparing, by the controller, the ammonia absorption amount with a minimum ammonia absorption amount when the ...

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Номер записи: 15
24-01-2019 дата публикации

ABNORMALITY DIAGNOSIS SYSTEM FOR EXHAUST GAS PURIFICATION APPARATUS

Номер: US20190024564A1
Автор: Kidokoro Toru, Takaoka Kazuya
Принадлежит: TOYOTA JIDOSHA KABUSHIKI KAISHA

An object of the disclosure is to provide a technology that enables abnormality diagnosis of an NOx trap catalyst to make the diagnosis that the NOx trap catalyst is abnormal even if the degree of deterioration of the NOx trap catalyst, is relatively small yet. When performing abnormality diagnosis of an NOx trap catalyst, a system according to the disclosure performs a lean temperature raising process, which is the process of raising the temperature of the NOx trap catalyst to or above a predetermined temperature while keeping the air-fuel ratio of the exhaust gas flowing into the NOx trap catalyst at a lean air-fuel ratio. The system diagnoses abnormality of the NOx trap catalyst on the basis of the NOx storage efficiency of the NOx trap catalyst or a parameter correlating with that NOx storage efficiency after the completion of the lean temperature raise process. 1. An abnormality diagnosis system for an exhaust gas purification apparatus including an NOx trap catalyst prodded in an exhaust passage of an internal combustion engine that operates in a lean burn mode to store NOx in exhaust gas , comprising:a controller comprising at least one processor configured toperform a lean temperature raise process, which is the process of raising the temperature of said NOx trap catalyst to above predetermined temperature while keeping the air-fuel ratio of the exhaust gas flowing into said NOx trap catalyst at a lean air-fuel ratio higher than the theoretical air-fuel ratio, when a specific abnormality diagnosis condition is met; anddiagnose abnormality of said NOx trap catalyst on the basis of the NOx storage efficiency of said NOx trap catalyst or a parameter correlating with that NOx storage efficiency after the completion of said lean temperature raise process.2. An abnormality diagnosis system for an exhaust gas purification apparatus according to claim 1 , wherein said predetermined temperature is a temperature at which NOx stored in said NOx trap catalyst can be ...

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Номер записи: 16
02-02-2017 дата публикации

DEVICE AND METHOD FOR IMPACTING THE AMOUNT OF NITROGEN OXIDES IN EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE

Номер: US20170030235A1
Автор: NILSSON MAGNUS
Принадлежит:

A method and an exhaust treatment system are provided for treatment of an exhaust stream that comprises nitrogen oxides NO. The method comprises using a first slip-catalyst SC, arranged at a first device to create a first impact on a first amount of nitrogen oxides NOAn NO-storing catalyst may store nitrogen oxides NO. The first slip-catalyst SCmay reduce nitrogen oxides NO, and/or oxidize potential additive in the exhaust stream. This first impact is actively controlled, based on the first amount of nitrogen oxides NOreaching the first device. The method also comprises a second impact on a second amount of nitrogen oxides NOreaching a second device. The active control of the first impact may be by active control of the dosage of additive at the first device, and/or through an active control of an exhaust environment, for example, a temperature for the exhaust stream. 1. A method for treatment of an exhaust stream , resulting from a combustion in a combustion engine and comprising nitrogen oxides NO , comprising nitrogen monoxide NO and nitrogen dioxide NO; said method comprising:{'sub': x', '_', '1', 'x', '_', '1', '1', '1', 'x', 'x', '_', '1, 'a first impact on a first amount of nitrogen oxides NOreaching a first device, arranged in said exhaust treatment system in order to impact said first amount of nitrogen oxides NO, so that first said impact is carried out through the use of at least a first slip-catalyst (SC) in said first device, wherein said first slip-catalyst (SC) carries out primarily a reduction of nitrogen oxides NO, and secondarily an oxidation of potential additive in said exhaust stream, so that said first impact is actively controlled, based at least on said first amount of nitrogen oxides NOreaching said first device; and'}{'sub': x', '_', '2', 'x', '_', '2, 'a second impact on a second amount of nitrogen oxides NOreaching a second device, arranged downstream of said first device, in order to impact said second amount of nitrogen oxides NO.'}2. A ...

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Номер записи: 17
05-02-2015 дата публикации

Temperature gradient correction of ammonia storage model

Номер: US20150033704A1
Автор: James M. Perrin, Justin Adam Shetney, Paul Jasinkiewicz, Raffaello Ardanese
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

An exhaust gas treatment system includes a SCR device that stores a reductant that reacts with the NOx emissions and a reductant supply system to inject the reductant according to a reductant load model. At least one temperature sensor or model generates a temperature signal indicating an SCR temperature of the SCR device. The exhaust gas treatment system further includes a control module in electrical communication with the reductant supply system. The control module is configured to determine an amount of reductant that slips from the SCR device based on the at least one temperature signal and the rate of change of the SCR temperature. The control module further determines a correction factor based on the amount of slipped reductant to modify the reductant load model.

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Номер записи: 18
04-02-2021 дата публикации

A SYSTEM AND A METHOD FOR DIAGNOSING THE PERFORMANCE OF TWO NOX SENSORS IN AN EXHAUST GAS PROCESSING CONFIGURATION COMPRISING TWO SCR UNITS

Номер: US20210033041A1
Автор: SOMMANSSON Joakim, STRÅÅT Fredrik
Принадлежит: SCANIA CV AB

The invention relates to a method, system, and computer program product for diagnosing an exhaust gas processing configuration for a combustion engine of a vehicle, said configuration comprising two SCR-units, two NOx-sensors and two reducing agent dosing units suitably arranged, comprising the steps of: performing a series of reducing agent dosing operations by a first reducing agent dosing unit; comparing measured NOx-contents measured by a first NOx-sensor and a second NOx-sensor related to said operations; and if the respective NOx-content measured by the respective NOx-sensors during the performed reducing agent dosing operations are substantially equal, determining that the respective NOx-sensors provide a proper performance. 1. A method for diagnosing an exhaust gas processing configuration for a combustion engine of a vehicle , said configuration comprising a first SCR-unit and a first NO-sensor arranged downstream said first SCR-unit and a second SCR-unit and a second NO-sensor arranged downstream said second SCR-unit and a first reducing agent dosing unit arranged upstream said first SCR-unit and a second reducing agent dosing unit arranged between said first SCR-unit and said second SCR-unit , said method comprising:determining whether a predetermined status of said exhaust gas processing configuration is at hand, and if so;performing a series of reducing agent dosing operations by said first reducing agent dosing unit;{'sub': x', 'x', 'x, 'determining an amount of NO-content measured by means of said first NO-sensor and said second NO-sensor for a number of said reducing agent dosing operations;'}{'sub': x', 'x', 'x, 'comparing said NO-content measured by said first NO-sensor and said second NO-sensor; and'}{'sub': x', 'x', 'x, 'if the respective NO-content measured by the respective NO-sensors during the performed reducing agent dosing operations are substantially equal, determining that the respective NO-sensors provide a proper performance.'}2. The ...

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Номер записи: 19
09-02-2017 дата публикации

AMMONIA SENSOR CONTROL, WITH NOX FEEDBACK, OF AN SCR AFTERTREATMENT SYSTEM

Номер: US20170037758A1
Автор: Geveci Mert, Osburn Andrew W.
Принадлежит:

An exemplary method includes determining an NHreference target in an exhaust conduit between a first SCR catalyst and a second SCR catalyst. The method includes determining a present amount of NHin the exhaust conduit between the first SCR catalyst and the second SCR catalyst, and determining an NHerror term in response to the NHreference target and the present amount of NH. The method further includes determining an amount of NOdownstream of the second SCR catalyst, and adjusting one of the NHreference target and a reductant doser command in response to the amount of NOdownstream of the second SCR catalyst. The method further includes providing a reductant doser command in response to the NHerror term. 1. A method , comprising:{'sub': 3', '3, 'determining an ammonia (NH) reference target comprising a target amount of NHin an exhaust conduit between a first selective catalytic reduction (SCR) catalyst and a second SCR catalyst located in the exhaust conduit;'}{'sub': '3', 'determining a present amount of NHin the exhaust conduit between the first SCR catalyst and the second SCR catalyst with an ammonia sensor;'}{'sub': 3', '3', '3, 'determining an NHerror term in response to the NHreference target and the present amount of NH;'}{'sub': '3', 'determining a reductant closer command in response to the NHerror term;'}{'sub': x', '3', 'x, 'determining an amount of NOdownstream of the second SCR catalyst, and adjusting one of the NHreference target and a reductant doser command in response to the amount of NOdownstream of the second SCR catalyst; and'}{'sub': '3', 'injecting, with a reductant injector, an amount of reductant in response to the adjusted one of the NHreference tamet and the reductant doser command.'}2. (canceled)3. The method of claim 2 , further comprising determining a rate of change of the amount of NOdownstream of the second SCR catalyst claim 2 , and further adjusting the one of the NHreference target and the reductant doer conunand in response to the ...

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Номер записи: 20
08-02-2018 дата публикации

EXHAUST EMISSION CONTROL SYSTEM OF ENGINE

Номер: US20180038301A1
Автор: Kanno Masanobu, Tetsuno Masayuki, Yamaguchi Takayuki
Принадлежит:

An exhaust emission control system of an engine including a NOcatalyst disposed in an exhaust passage and for storing NOwithin exhaust gas when an air-fuel ratio of the exhaust gas is lean, and reducing the stored NOwhen the air-fuel ratio is approximately stoichiometric or rich, is provided. The system includes a SCR catalyst disposed downstream of the NOcatalyst and for purifying NOby causing a reaction with ammonia, and a processor configured to execute a NOreduction controlling module for controlling the air-fuel ratio to a target ratio so that the stored NOis reduced. The controlling module limits the performance of the NOreduction control when a temperature of the SCR catalyst is above a given temperature and loosens the limitation in a given engine operating state in which an exhaust gas flow rate is above a given rate despite the SCR catalyst temperature. 1. An exhaust emission control system of an engine , including a NOcatalyst disposed in an exhaust passage of the engine and for storing NOwithin exhaust gas when an air-fuel ratio of the exhaust gas is lean , and reducing the stored NOwhen the air-fuel ratio is approximately stoichiometric or rich , the system comprising:{'sub': x', 'x, 'a SCR catalyst disposed in the exhaust passage downstream of the NOcatalyst and for purifying NOwithin exhaust gas by causing a reaction with ammonia; and'}{'sub': x', 'x', 'x', 'x', 'x', 'x', 'x, 'a processor configured to execute a NOreduction controlling module for performing a NOreduction control in which the air-fuel ratio is controlled to a target air-fuel ratio so that the stored NOis reduced, the target air-fuel ratio being a ratio at which the stored NOis reducible, wherein the NOreduction controlling module limits the performance of the NOreduction control when temperature of the SCR catalyst is above a given temperature, the limitation of the performance of the NOreduction control being loosened in a given operating state of the engine in which a flow rate of ...

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Номер записи: 21
07-02-2019 дата публикации

EXHAUST TREATMENT SYSTEM AND METHOD FOR TREATMENT OF AN EXHAUST STREAM

Номер: US20190040778A1
Автор: BIRGERSSON Henrik, NILSSON MAGNUS
Принадлежит: SCANIA CV AB

An exhaust treatment system comprising: a first dosage device, arranged to supply a first additive into said exhaust stream; a first reduction catalyst device, downstream of said first dosage device arranged for reduction of nitrogen oxides in said exhaust stream through the use of said first additive; a particulate filter, at least partly comprising a catalytically oxidizing coating, which is downstream of said first reduction catalyst device to catch soot particles, and to oxidize one or several of nitrogen oxide and incompletely oxidized carbon compounds in said exhaust stream; a second dosage device, downstream of said particulate filter to supply a second additive into said exhaust stream; and a second reduction catalyst device, downstream of said second dosage device for a reduction of nitrogen oxides in said exhaust stream, with the use of at least one of said first and said second additive. 1. An exhaust treatment system , arranged for treatment of an exhaust stream , which results from a combustion in a combustion engine , said system comprising:a first dosage device, arranged to supply a first additive into said exhaust stream;{'sub': 'x', 'b': '1', 'a first reduction catalyst device, arranged downstream of said first dosage device, and arranged for reduction of nitrogen oxides NOin said exhaust stream through the use of said first additive, wherein said first reduction catalyst device comprises a first slip-catalyst (SC), arranged for at least one of a reduction of nitrogen oxides NOx and oxidation of a residue of additive in said exhaust stream;'}a particulate filter, at least partly comprising a catalytically oxidizing coating, which is arranged downstream of said first reduction catalyst device, and is arranged to catch and oxidize soot particles, and to oxidize one or several of nitrogen oxide NO and incompletely oxidized carbon compounds in said exhaust stream;a second dosage device, arranged downstream of said particulate filter, and arranged to ...

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Номер записи: 22
06-02-2020 дата публикации

UREA INJECTION CONTROL METHOD IN EXHAUST AFTERTREATMENT SYSTEM

Номер: US20200040785A1
Автор: CHOI Yoon Sung
Принадлежит:

A urea injection control method in an exhaust after-treatment system includes: performing an ammonia slip prevention logic that adjusts a urea injection amount based on the highest temperature during a predetermined period of time from an end point of filter regeneration to a thermal equilibrium point when a temperature of a selective catalytic reduction (SCR) catalyst is higher than or equal to a predetermined threshold temperature at the end point of the filter regeneration; and adjusting a urea injection amount based on an ammonia storage amount map when the temperature of the SCR catalyst is lower than or equal to the predetermined threshold temperature at the end point of the filter regeneration. In particular, the thermal equilibrium point is a point at which a temperature of a filter is close or equal to an exhaust gas temperature. 1. A urea injection control method in an exhaust after-treatment system having a selective catalytic reduction (SCR) catalyst , a filter located upstream of the SCR catalyst , a dosing module injecting urea to the SCR catalyst , and a dosing control unit controlling the dosing module , the method comprising:performing an ammonia slip prevention logic that adjusts a urea injection amount based on a highest temperature during a predetermined period of time from an end point of filter regeneration to a thermal equilibrium point when a temperature of the SCR catalyst is higher than or equal to a predetermined threshold temperature at the end point of the filter regeneration; andadjusting a urea injection amount based on an ammonia storage amount map when the temperature of the SCR catalyst is lower than or equal to the predetermined threshold temperature at the end point of the filter regeneration,wherein the thermal equilibrium point is a point at which a temperature of the filter is close or equal to an exhaust gas temperature.2. The method according to claim 1 , wherein the filter is a diesel particulate filter with SCR coating ( ...

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Номер записи: 23
25-02-2016 дата публикации

Exhaust purification device for internal combustion engine

Номер: US20160053654A1
Автор: Masafumi Noda, Mitsuhiro Aso, Tadashi Uchiyama
Принадлежит: Isuzu Motors Ltd

An exhaust gas purification device includes a diesel particulate filter (DPF) that collects particulate matter (PM) from an exhaust gas, a urea water spray unit that sprays urea water into the exhaust gas, a selection catalytic reduction (SCR) device that reduces and purifies NO x of the exhaust gas, a capacitance detecting unit that detects capacitance of the DPF, a PM accumulation calculating unit that calculates an amount of accumulated PM on the basis of the capacitance, an NO 2 consumption estimating unit that calculates an amount of consumed NO 2 on the basis of the amount of accumulated PM, and a control unit that controls an engine such that a ratio of NO to NO 2 flowing into the SCR approaches 1:1 on the basis of the estimated consumption.

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Номер записи: 24
27-02-2020 дата публикации

Selective catalytic reduction process and off-line regeneration of deactivated catalyst of the process

Номер: US20200061538A1
Автор: Guido SENG
Принадлежит: SHELL OIL COMPANY

Presented is a process for the off-line regeneration of a deactivated nitrogen oxide decomposition catalyst of a selective catalytic reduction system that is a component of a flue gas treating system. The selective catalytic reduction system is isolated to allow for removal and replacement of deactivated SCR catalyst. The removed SCR catalyst may be regenerated off-line from the flue gas treating system. The off-line regenerated SCR catalyst can be used as a replacement SCR catalyst.

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Номер записи: 25
11-03-2021 дата публикации

Determination of an Ash Loading of a Particulate Filter for an Internal Combustion Engine

Номер: US20210071562A1
Автор: Ralf Schulz
Принадлежит: Bayerische Motoren Werke AG

A measuring device for the determination of an ash loading of a particulate filter for an internal combustion engine of a motor vehicle, where a regeneration operation of the particulate filter is carried out such that, after termination of the regeneration operation, a predefined, minimum soot loading remains on the particulate filter. The measuring device is configured to determine an actual regeneration variable which is characteristic for a loading combustion operation during the regeneration operation of the particulate filter via a pressure sensor which is attached downstream in the exhaust gas flow of the particulate filter in the exhaust gas system of the internal combustion engine. The measuring device is further configured to determine the ash loading of the particulate filter dependent on the actual regeneration variable and a variable which is characteristic for the time duration of the regeneration operation.

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Номер записи: 26
15-03-2018 дата публикации

METHOD FOR CONTROLLING AN EXHAUST GAS TREATMENT SYSTEM

Номер: US20180071681A1
Автор: Miller Jon C., Smith Michael A.
Принадлежит:

Provided is a method for controlling an exhaust gas treatment system, wherein the system includes an exhaust gas stream supplied by an exhaust gas source to a selective catalytic reduction (SCR) device and a particulate filter device. The method comprises detecting a threshold level of reductant deposits proximate the SCR device, and initiating a selective catalytic reduction device service in response thereto. A threshold level of reductant deposits is detected using a reductant deposit model comprising determining an actual SCR NOconversion using measured process variables; and comparing the actual SCR NOconversion to a calibrated NOconversion value. The calibrated NOconversion value is determined using exhaust gas flow and system temperature values which substantially correspond to the process variables under which the actual SCR NOconversion was determined. The device service can include increasing the exhaust gas temperature or initiating an active regeneration of the particulate filter device. 1. A method for controlling an exhaust gas treatment system including an exhaust gas stream supplied by an exhaust gas source to a selective catalytic reduction (SCR) device and a particulate filter device , the method comprising: detecting a threshold level of reductant deposits proximate the SCR device , and initiating a selective catalytic reduction device service in response thereto.2. The method of claim 1 , wherein the SCR device comprises a selective catalytic reduction filter device.3. The method of claim 1 , wherein the SCR device service comprises an active regeneration of the particulate filter device.4. The method of claim 3 , wherein active regeneration comprises increasing the exhaust gas temperature.5. The method of claim 3 , wherein active regeneration comprises one or more of normally operating the exhaust gas source claim 3 , utilizing an electrically heated catalyst claim 3 , and utilizing an oxidizing catalyst device.6. The method of claim 1 , wherein ...

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Номер записи: 27
15-03-2018 дата публикации

NOx OCCLUSION AMOUNT ESTIMATING DEVICE AND NOx OCCLUSION AMOUNT ESTIMATING METHOD

Номер: US20180073413A1
Автор: Nagaoka Daiji, Nakada Teruo, Sakamoto Takayuki
Принадлежит:

An exhaust purification system includes a NOx-occlusion-reduction-type catalyst that occludes NOx in exhaust in a lean state and reduces and purifies the occluded NOx in exhaust in a rich state, and a NOx purge rich control unit that executes NOx purge of reducing and purifying the occluded NOx by putting the exhaust into the rich state by fuel injection control, where a catalyst temperature of the NOx-occlusion-reduction-type catalyst is equal to or higher than a catalyst temperature threshold value and a NOx occlusion amount of the NOx-occlusion-reduction-type catalyst is equal to or higher than an NOx occlusion amount threshold value, and executes the NOx purge when the catalyst temperature is lower than a catalyst temperature threshold value. 1. A NOx occlusion amount estimating device of a NOx-occlusion-reduction-type catalyst provided in an exhaust passage of an engine and configured to purify NOx in exhaust , the device comprising a controller configured to:acquire a catalyst temperature of the NOx-occlusion-reduction-type catalyst;as a provisional NOx occlusion amount, a NOx amount, which is to be emitted from the engine and occluded in the NOx-occlusion-reduction-type catalyst, on the basis of a catalyst-inlet NOx amount estimated from an operating state of the engine and the acquired catalyst temperature;calculate a lean-time NOx release amount, which is to be separated and released from the NOx-occlusion-reduction-type catalyst during a lean operation of the engine, on the basis of the acquired catalyst temperature during the lean operation; andcalculate an actual NOx occlusion amount occluded in the NOx-occlusion-reduction-type catalyst by subtracting the lean-time NOx release amount from the provisional NOx occlusion amount.2. The NOx occlusion amount estimating device according to claim 1 ,wherein the NOx-occlusion-reduction-type catalyst is a NOx-occlusion-reduction-type catalyst configured to occlude NOx in the exhaust in an exhaust lean state and to ...

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Номер записи: 28
16-03-2017 дата публикации

EXHAUST TREATMENT SYSTEM AND METHOD FOR TREATMENT OF AN EXHAUST STREAM

Номер: US20170074139A1
Автор: BIRGERSSON Henrik, NILSSON MAGNUS
Принадлежит:

An exhaust treatment system is provided for treatment of an exhaust stream, where the system comprises a first dosage device, arranged to supply a first additive into said exhaust stream and a first reduction catalyst device, arranged downstream for reduction of nitrogen oxides in said exhaust stream through the use of said first additive, and for the generation of heat through at least one exothermal reaction with said exhaust stream. A particulate filter arranged downstream of said first reduction catalyst device to catch soot particles. A second dosage device arranged downstream of said particulate filter to supply a second additive into said exhaust stream and a second reduction catalyst device, arranged downstream of said second dosage device for reduction of nitrogen oxides in said exhaust stream through the use of at least one of said first and said second additive. 1. An exhaust treatment system arranged for treatment of an exhaust stream , which results from a combustion in a combustion engine , said system comprising:a first dosage device arranged to supply a first additive into said exhaust stream;{'sub': x', '1', 'x, 'a first reduction catalyst device, arranged downstream of said first dosage device, and arranged for reduction of nitrogen oxides NOin said exhaust stream, through the use of said first additive, said first reduction catalyst device comprising a first slip-catalyst (SC) arranged primarily for carrying out a reduction of nitrogen oxides NO, and secondarily for carrying out an oxidation of a residue of additive in said exhaust stream, and also for the generation of heat through at least one exothermal reaction with said exhaust stream, said generated heat enabling a regeneration of one or several components, through which said exhaust stream passes;'}a particulate filter, which is arranged downstream of said first reduction catalyst device, and is arranged to catch and oxidise soot particles;a second dosage device, arranged downstream of said ...

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Номер записи: 29
16-03-2017 дата публикации

Method for determining the aging of an oxidation catalyst in an exhaust gas aftertreatment system of an internal combustion engine, method for detecting ash in a particle filter of an exhaust gas aftertreatment system, control device, and internal combustion engine

Номер: US20170074146A1
Автор: Boban Maletic, Gerald Fast, Jens Niemeyer, Ralf Müller, Tim Späder
Принадлежит: MTU Friedrichshafen GmbH

A method for determining the aging of an oxidation catalyst in an exhaust gas aftertreatment system of an internal combustion engine, having the following steps: ascertaining a soot burn rate of a particle filter of the exhaust gas aftertreatment system; adapting a function having at least one adaptation parameter to the soot burn rate dependent on at least one variable, a value of the adaptation parameter depending on an aging of the oxidation catalyst; and determining the aging of the oxidation catalyst using the adaptation parameter value ascertained by adapting the function.

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Номер записи: 30
24-03-2016 дата публикации

Catalyst Protection Against Hydrocarbon Exposure

Номер: US20160084135A1
Автор: Aaron Harmon, Adwait Joshi, Brandon Abel, Joshua Ratts, Wilce Williams
Принадлежит: Caterpillar Inc

A system to protect an after treatment system from the effects of hydrocarbon accumulation on a catalyst. An engine system microprocessor using software estimates the amount of hydrocarbon accumulation on the after treatment system based on engine system parameters and other parameters. The accumulated hydrocarbons can cause an exothermic event if the catalyst temperature is allowed to ramp up too quickly. Similarly, accumulated hydrocarbon can temporarily reduce after treatment system performance. In the case of SCR, the microprocessor can control a reductant injector to modulate the amount of reductant being injected into the after treatment system to control the amount of ammonia slip. Alternatively or in addition to, the microprocessor can communicate with proper electronic control modules to modulate the engine system parameters such as engine speed, fuel, and back pressure to control engine exhaust flow temperature during operation of the engine system.

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Номер записи: 31
23-03-2017 дата публикации

METHOD AND SYSTEM FOR CONTROLLING NITROGEN OXIDE EMISSIONS FROM A COMBUSTION ENGINE

Номер: US20170082003A1
Автор: NILSSON MAGNUS
Принадлежит: SCANIA CV AB

A treatment system for providing treatment of an exhaust stream comprising nitrogen oxides NO, in which nitrogen monoxide NO and nitrogen dioxide NOare comprised. When the exhaust stream passes through the treatment system, oxidation occurs of compounds comprising nitrogen, carbon and/or hydrogen. An amount of nitrogen oxides NOreaching a reduction catalyst device downstream of the oxidising component in the exhaust treatment system is reduced. A ratio (NO/NO)between an amount of nitrogen dioxide NOreaching a reduction catalyst device and the amount of nitrogen oxides NOreaching the reduction catalyst device is determined. An active control of at least one parameter related to the combustion engine is carried out, based on the determined ratio, so that the amount of nitrogen oxides NOreaching the reduction catalyst device is increased, if the determined ratio (NO/NO)exceeds an upper threshold value (NO/NO). 1. A method for treatment of an exhaust stream , resulting from a combustion in a combustion engine , passing through an exhaust treatment system , and comprising nitrogen oxides NO , wherein said NOcomprises nitrogen monoxide NO and nitrogen dioxide NO; said method comprising:an oxidation of compounds comprising one or several of nitrogen, carbon and hydrogen in said exhaust stream, wherein said oxidation is carried out by at least one oxidizing component arranged in said exhaust treatment system;{'sub': 'x', 'a reduction of an amount of nitrogen oxides NOreaching a reduction catalyst device, arranged downstream of said oxidizing component in said exhaust treatment system, wherein said reduction is carried out through a catalytic reaction using an additive, and wherein said reduction catalyst device includes a first reduction catalyst device arranged upstream of a particulate filter of said exhaust treatment system to provide a first impact on a first amount of nitrogen oxides reaching said first device and a second reduction catalyst device arranged downstream ...

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Номер записи: 32
31-03-2022 дата публикации

SELF-ADAPTIVE OIL SPRAYING CONTROL SYSTEM AND METHOD FOR BIODIESEL ENGINE

Номер: US20220099010A1
Автор: FANG Liang, Hu Zhiyuan, LOU Diming, TAN Piqiang, ZHANG Yunhua, Zhao Yinghua
Принадлежит: TONGJI UNIVERSITY

The disclosure relates to a self-adaptive oil spraying control system and method for a biodiesel engine. The control system includes an exhaust pipe, a gas sensor, a control module and an oil sprayer, wherein the exhaust pipe is connected to the oil sprayer, the gas sensor is mounted in the exhaust pipe, and the gas sensor and the oil sprayer are connected to the control module respectively. According to the control method, a main spray advance angle of the engine is subjected to closed-loop control directly through comparison between an idling steady state NOemission signal and an idling steady state NOemission value of pure diesel when the engine uses the biodiesel, so that emission of NOin the exhaust is reduced. Compared with the prior art, the disclosure has the advantages of no need of detecting a biodiesel ratio, high efficiency, good effect and the like. 1. A self-adaptive oil spraying control system for a biodiesel engine , comprising an exhaust pipe , a gas sensor , a control module and an oil sprayer , wherein the exhaust pipe is connected to the oil sprayer; the gas sensor is mounted in the exhaust pipe; the gas sensor and the oil sprayer are connected to the control module respectively; and a self-adaptive oil spraying control program is embedded in the control module.2. The self-adaptive oil spraying control system for the biodiesel engine according to claim 1 , wherein there is a plurality of oil sprayers; and the plurality of oil sprayers are connected to the control module respectively.3. The self-adaptive oil spraying control system for the biodiesel engine according to claim 1 , wherein the gas sensor is a NOsensor.4. The self-adaptive oil spraying control system for the biodiesel engine according to claim 1 , wherein the control module is a vehicle-mounted electronic control unit (ECU).5. A self-adaptive oil spraying control method for a biodiesel engine applied to the oil spraying control system according to claim 1 , comprising:{'b': '1', 'sub ...

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Номер записи: 33
30-03-2017 дата публикации

Exhaust Gas Purification System of Internal Combustion Engine

Номер: US20170089242A1
Автор: Hiroyoshi Ueda
Принадлежит: Toyota Motor Corp

In an exhaust gas purification system having an oxidation catalyst and an exhaust gas purifying unit formed so as to include a filter and a selective reduction-type NOx catalyst, at least one of supply of the fuel component and supply of ammonia or an ammonia precursor in an amount that is increased when a prescribed condition under which a part of a fuel component supplied to exhaust gas passes through to a downstream side of the oxidation catalyst is satisfied as compared to a non-passing time supply amount that is a supply amount of ammonia or the ammonia precursor to be supplied when the prescribed condition is not satisfied is controlled such that ammonia for NOx selective reduction by the increased ammonia or ammonia precursor reaches the exhaust gas purifying unit before the passed fuel component. Accordingly, an effect of a fuel component supplied to exhaust gas on a NOx purification performance of the selective reduction-type NOx catalyst is minimized in the exhaust gas purification system of the internal combustion engine which includes the filter and the selective reduction-type NOx catalyst.

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Номер записи: 34
12-05-2022 дата публикации

Method for controlling the operation of an engine system in a vehicle

Номер: US20220145789A1
Автор: Johan Dahl
Принадлежит: Volvo Truck Corp

A method for controlling the operation of an engine system in a vehicle. The engine system including an engine and an exhaust aftertreatment system having an SCR catalyst and a DPF. The method includes determining preview information of the vehicle operation based at least on an upcoming road event and an engine operation associated with the upcoming road event; performing, in response of the preview information, at least one of: controlling the operation of the engine system by increasing reductant injection to meet an ammonia storage threshold level; controlling the operation of the engine system by increasing the engine out NOx to reduce the ammonia storage in the SCR catalyst to meet an ammonia slip threshold level in the SCR catalyst; controlling the operation of the engine system by decreasing the engine out NOx to increase the amount of engine out particles to meet a soot threshold level in the DPF.

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Номер записи: 35
28-03-2019 дата публикации

APPARATUS FOR PURIFYING EXHAUST GAS

Номер: US20190093539A1
Автор: Jung Changho, KIM Pyung Soon
Принадлежит:

A regeneration method of an apparatus of purifying an exhaust gas including a catalytic converter which is disposed on an exhaust pipe and includes a lean NOx trap (LNT) device in which a first LNT catalyst is coated and a catalyzed particulate filter (CPF) in which a second LNT catalyst is coated may include determining whether a nitrogen oxide (NOx) amount absorbed in the LNT device is greater than a threshold NOx amount, determining whether a temperature of the LNT device is higher than a first predetermined temperature when the NOx amount absorbed in the LNT device is greater than the threshold NOx amount, and regenerating, both of the LNT device and the CPF or only the LNT device according to a temperature of the CPF when the temperature of the LNT device is higher than the first predetermined temperature. 17-. (canceled)8. An apparatus for purifying an exhaust gas , comprising:a catalytic converter disposed on an exhaust pipe and including a lean NOx trap (LNT) device in which a first LNT catalyst is coated and a catalyzed particulate filter (CPF) in which a second LNT catalyst is coated, the LNT device and the CPF being sequentially disposed in the catalytic converter; anda controller determining or detecting an inlet lambda of the LNT device, an outlet lambda of the LNT device, and an outlet lambda of the CPF, determining or detecting a temperature of the LNT device and a temperature of the CPF, determining nitrogen oxide (NOx) amounts absorbed in the LNT device and the CPF, and controlling regeneration of the LNT device and the CPF,wherein the controller performs the regeneration of the LNT device and the CPF according to the temperature of the LNT device and the temperature of the CPF when the NOx amount absorbed in the LNT device is greater than a threshold NOx amount, andthe controller performs regeneration of both of the LNT device and the CPF when the temperature of the LNT device is higher than a first predetermined temperature and the temperature of ...

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Номер записи: 36
08-04-2021 дата публикации

Systems and methods for diagnosis of nox storage catalyst

Номер: US20210102488A1
Автор: ASHOK KUMAR, Krishna Kamasamudrum, Michael Haas
Принадлежит: Cummins Inc

Systems, apparatuses, and methods include an upstream exhaust analysis circuit structured to determine a characteristic of an exhaust gas stream entering a nitrous oxide (NOx) storage catalyst; a prediction circuit structured to predict a downstream NOx concentration of an exhaust gas stream exiting the NOx storage catalyst based on a model of a NOx storage capacity or a dynamic response of the NOx storage catalyst; a downstream exhaust analysis circuit structured to determine a downstream NOx concentration of the exhaust gas stream exiting the NOx storage catalyst; and a comparison circuit structured to compare the predicted downstream NOx concentration to the determined downstream NOx concentration, and determine a health of the NOx storage catalyst based on the comparison.

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Номер записи: 37
04-04-2019 дата публикации

METHOD FOR DESULFURIZATION OF SELECTIVE CATALYTIC REDUCTION DEVICES

Номер: US20190101034A1
Автор: Mital Rahul, Qi Gongshin, Yadav Anil
Принадлежит:

Described herein is a desulfurization method for desulfurizing a SCR device treating an exhaust gas. The desulfurization method includes injecting a reductant into the exhaust gas upstream from or into the SCR device and increasing a temperature of the exhaust gas. 1. An emissions control system for treating exhaust gas in a motor vehicle including an internal combustion engine , the emissions control system comprising:a selective catalytic reduction (SCR) device;a controller operably connected to the SCR device and configured to perform a desulfurization method to desulfurize the SCR device by:injecting a reductant into the exhaust gas upstream from or into the SCR device; andincreasing a temperature of the exhaust gas;a downstream NOx sensor operably connected to and in fluid communication with the exhaust gas, the downstream NOx sensor disposed downstream of the SCR device and operably connected to the controller; andan upstream NOx sensor operably connected to and in fluid communication with the exhaust gas, the upstream NOx sensor disposed upstream of the SCR device and operably connected to the controller,wherein the downstream NOx sensor is configured to measure a downstream NOx value of the exhaust gas from the downstream NOx sensor, andwherein the upstream NOx sensor is configured to measure a upstream NOx value of the exhaust gas from the upstream NOx sensor, andwherein the desulfurization method further comprises:measuring a downstream NOx value from the downstream NOx sensor;measuring an upstream NOx value from the upstream NOx sensor; anddetermining a NOx conversion efficiency using the downstream NOx value and the upstream NOx value,wherein, if the NOx conversion efficiency is equal to or less than a NOx conversion efficiency lower limit, the injecting of the reductant and the increasing of the temperature of the exhaust is initiated.2. The emissions control system of claim 1 , wherein the controller is programmed to inject the reductant and increase ...

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Номер записи: 38
02-06-2022 дата публикации

METHODS AND SYSTEM FOR CONTROLLING SELECTIVE CATALYTIC REDUCTANT CATALYST OF A GASOLINE ENGINE

Номер: US20220170400A1
Автор: Cavataio Giovanni, Gernant Timothy R., Thomas Joseph, Uhrich Michael, Van Nieuwstadt Michiel J.
Принадлежит:

Systems and methods for controlling a gasoline urea selective catalytic reductant catalyst are described. In one example, an observer is provided that corrects an estimate of an amount of NHthat is stored in a SCR. The amount of NHthat is stored in the SCR is a basis for generating additional NHor ceasing generation of NH. 1. A method for operating an engine , comprising:{'sub': '3', 'estimating an amount of NHstored in a selective catalytic reductant catalyst (SCR) via a controller;'}{'sub': '3', 'correcting the amount of NHstored in the SCR via the controller in response to output of first oxygen sensor and output of a second oxygen sensor; and'}{'sub': '3', 'adjusting an amount of fuel injected to an engine via the controller according to the corrected amount of NHstored in the SCR.'}2. The method of claim 1 , further comprising delivering a rich air-fuel ratio to the engine to correct the amount of NHstored in the SCR.3. The method of claim 2 , further comprising correcting the output of the first oxygen sensor and the output of the second oxygen sensor for voltage offsets.4. The method of claim 3 , further comprising correcting the amount of NHstored in the SCR via integrating a difference between the output of the first oxygen sensor and the output of the second oxygen sensor.5. The method of claim 4 , further comprising correcting the amount of NHstored in the SCR based on the integrated difference between the output of the first oxygen sensor and output of the second oxygen sensor.6. The method of claim 5 , further comprising correcting the amount of NHstored in the SCR based on an estimated amount of NHslip past the SCR.7. The method of claim 1 , where adjusting the amount of fuel injected to the engine includes enriching an engine air-fuel in response to the corrected amount of NHstored in the SCR being less than a first threshold.8. The method of claim 7 , where adjusting the amount of fuel injected to the engine includes leaning an engine air-fuel in ...

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Номер записи: 39
21-04-2016 дата публикации

Aftertreatment Control for Detection of Fuel Contaminant Concentration

Номер: US20160108791A1
Автор: Brian V. Tranel, Purvarag S. Shah, Sylvain J. Charbonnel
Принадлежит: Caterpillar Inc

A method and a system for determining if fuel containing more than the desired concentration of sulfur is being combusted in an engine. The engine includes a selected catalytic reduction (SCR) module or a lean NOx trap (LNT) and the system includes various sensors and a controller for calculating NOx conversion ratio and ammonia slip. Timers are utilized for purposes of positively identifying when sulfur in the fuel is causing a substandard performance of the exhaust system. If the timers or time periods are not satisfied, a conversion ratio failure or an ammonia slip failure is attributable to equipment failure, and not sulfur in the fuel. However, if the timers are satisfied, then sulfur in the fuel is positively identified as the problem thereby enabling the operator to eliminate equipment failure as a possible source of the conversion ratio or ammonia slip failure.

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Номер записи: 40
11-04-2019 дата публикации

ENGINE CONTROL APPARATUS

Номер: US20190107028A1
Автор: SHIMADA Masanori
Принадлежит: TOYOTA JIDOSHA KABUSHIKI KAISHA

An ECU calculates a target temperature of a bed temperature of a DOC under PM regeneration control at each control period by the elements M to M. Among these elements, the estimating section M estimates a passing SOamount at each control period by using an inflow SOx amount and a representative temperature. The estimating section M estimates a SOreduction rate, which is a ratio of reduction from SOto SOin the DOC . Then, the calculating unit M calculates an amount of SOthat is allowed to desorb from the DOC as an allowable desorption SOamount at each control period, by using a constrained SOamount which corresponds to a constraint concerning sulfate white smoke, the passing SOamount, and the SOreduction rate. 1. An engine control apparatus comprising:a purifying device provided in an exhaust pipe of a diesel engine;a fuel adding valve for supplying unburnt fuel into the purifying device; and acquire a representative temperature that is a representative value of the purifying device at each predetermined control period;', 'estimate an amount of SOx flowing into the purifying device as an inflow SOx amount at each control period;', 'estimate a final adsorbed SOx distribution by using the inflow SOx amount and the representative temperature at each control period, the final adsorbed SOx distribution expressed as a graph in which an amount of SOx that finally adsorbs to the purifying device in each temperature during temperature increase of the purifying device is related with the representative temperature;', {'sub': 3', '3, 'estimate an amount of SOx that flows into the purifying device in a state of SOx and passes without adsorbing to the purifying device to be converted in a state of SOas a passing SOamount at each control period, by using the inflow SOx amount and the representative temperature;'}, {'sub': 2', '3', '2, 'estimate a SOreduction rate which is a ratio of reduction of SOto SOin the purifying device;'}, {'sub': 3', '3', '3', '3', '2, 'calculate an amount ...

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Номер записи: 41
30-04-2015 дата публикации

Scr filter washcoat thickness efficiency compensation system

Номер: US20150118112A1
Автор: Christopher C. Swoish, Christopher Whitt, Justin Adam Shetney, Thomas LaRose, JR.
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

An exhaust treatment system includes an SCRF device, a reductant delivery system, and an SCR storage module. The SCRF device includes a filter portion having a washcoat formed thereon that defines a washcoat thickness (WCT). The reductant delivery system is configured to inject a reductant that reacts with the washcoat based on a reductant storage model. The SCR storage module is in electrical communication with the reductant delivery system to provide the reductant storage model the amount of reductant to be injected based on the reductant storage model. The exhaust treatment system further includes a WCT compensation module configured to electrically communicate a WCT compensation value to the SCR storage module. The SCR storage module modifies the reductant storage model according to the WCT compensation value such that the amount of ammonia that slips from the SCRF device is reduced thereby increasing a storage efficiency of the SCRF device.

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Номер записи: 42
09-06-2022 дата публикации

Systems and methods for desulfation of catalysts included in aftertreatment systems

Номер: US20220178286A1
Автор: Aleksey Yezerets, James A. Cramer, Junhui Li, Michael J. Cunningham
Принадлежит: Cummins Emission Solutions Inc

An aftertreatment system for reducing constituents of an exhaust gas having a sulfur content includes: an oxidation catalyst; a filter disposed downstream of the oxidation catalyst; and a controller configured, in response to determining that the filter is to be regenerated and a desulfation condition being satisfied, to: cause a temperature of the oxidation catalyst to increase to a first regeneration temperature that is greater than or equal to 400 degrees Celsius and less than 550 degrees Celsius; cause the temperature of the oxidation catalyst to be maintained at the first regeneration temperature for a first time period; and after the first time period, cause the temperature of the oxidation catalyst to increase to a second regeneration temperature equal to or greater than 550 degrees Celsius.

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Номер записи: 43
27-04-2017 дата публикации

Methods and systems for rotating an exhaust aftertreatment device

Номер: US20170114740A1
Автор: Michael Solger
Принадлежит: FORD GLOBAL TECHNOLOGIES LLC

Methods and systems are provided for inverting a particulate filter housing. In one example, a method may include inverting the particulate filter housing to dislodge an ash load in the particulate filter.

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Номер записи: 44
18-04-2019 дата публикации

EXHAUST PURIFICATION SYSTEM OF CONTROLLING INJECTION AMOUNT OF REDUCING AGENT

Номер: US20190112953A1
Автор: JOO Ki Hyung, Kansy Waldemar Josef, Kwee John Henry, Lee Myung Jong, Muthukaruppan Arun Palaniappan, Park Jin Woo
Принадлежит:

Provided is an exhaust purification system that may include : a first catalyst installed on a rear exhaust pipe of an engine; a selective catalytic reduction (SCR) catalyst installed on the rear exhaust pipe of the first catalyst; a reducing agent injector which is installed on an exhaust pipe between the first catalyst and the SCR catalyst and configured to inject a reducing agent; and a controller configured to control an amount of reducing agent injected from the reducing agent injector. / The controller may calculate a total amount of ammonia adsorbed in the SCR catalyst, a required amount of reducing agent based on a total amount of ammonia adsorbed in the SCR catalyst, and the amount of nitrogen oxide introduced into the SCR catalyst, and then control a reducing agent injector to inject the required amount of reducing agent. 1. An exhaust purification system of controlling an injection amount of a reducing agent , comprising:a first catalyst installed on a rear exhaust pipe of an engine;a selective catalytic reduction (SCR) catalyst installed on the rear exhaust pipe of the first catalyst;a reducing agent injector which is installed on an exhaust pipe between the first catalyst and the SCR catalyst and configured to inject a reducing agent; anda controller configured to control an amount of the reducing agent injected from the reducing agent injector;wherein the SCR catalyst comprises a plurality of slices along a flow of exhaust gas and each slice comprises a plurality of cells having predetermined shapes having an uniform area wherein a total number of the plurality of the slices is represented by n and a total number of the cells is represented by m,wherein the controller sequentially calculates:i) a respective amount of ammonia adsorbed in the cells of each slice, sequentially from a first slice to a n-th slice, wherein an amount of ammonia adsorbed of an i-th slice is calculated by adding sequentially an amount of ammonia adsorbed in each cell from a ...

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Номер записи: 45
09-04-2020 дата публикации

SYSTEM AND METHODS OF INTEGRATED CONTROL OF COMBUSTION AND SCR SYSTEMS

Номер: US20200109651A1
Автор: ALFIERI Vincenzo, MAZZARA BOLOGNA Giuseppe, Wang Yue-Yun
Принадлежит:

An emissions control system for a motor vehicle that includes an internal combustion engine includes a first selective catalytic reduction (SCR) device and a reductant injector, The system further includes a model-based controller that is configured to calculate a target amount of reductant to inject to maintain a predetermined ratio between an amount of NH3 and an amount of NOx at the outlet of the first SCR device, and to send a command for receipt by the reductant injector to inject the calculated amount of reductant. The model-based controller is further configured to send a command for receipt by an engine controller to influence NOx production by the engine by modifying an engine operating parameter, based on a calculated target amount of NOx at the inlet of the first SCR device. 1. An emissions control system for a motor vehicle that includes an internal combustion engine , the emissions control system comprising:a first selective catalytic reduction (SCR) device;a reductant injector; anda model-based controller that is configured to:determine an amount of NOx and an amount of NH3 at an outlet of the first SCR device;calculate an allowable NOx increase multiplier value that will maintain the amount of NH3 at the outlet of the first SCR device below a predetermined level;calculate a target amount of NOx at an inlet of the first SCR device based on a present amount of NOx at the inlet of the first SCR device and the allowable NOx increase multiplier value;send a command for receipt by an engine controller to influence NOx production by the engine by modifying an engine operating parameter, based on the calculated target amount of NOx at the inlet of the first SCR device;calculate a target amount of reductant to inject to maintain a predetermined ratio between the amount of NH3 and the amount of NOx at the outlet of the first SCR device; andsend a command for receipt by the reductant injector to inject the calculated amount of reductant.2. The emissions control ...

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Номер записи: 46
05-05-2016 дата публикации

EXHAUST PURIFICATION DEVICE

Номер: US20160123207A1
Автор: ASO MITSUHIRO, Uchiyama Tadashi
Принадлежит: Isuzu Motors Limited

An exhaust gas purification device, including a diesel particulate filter (“DPF”) for collecting particulate matter contained in an exhaust gas, a forced regeneration unit or performing forced regeneration, a capacitance detection unit for detecting a capacitance of the DPF, a total accumulated amount estimation unit for estimating a total amount of accumulated particulate matter and ash collected in the DPF on the basis of the detected capacitance, and an ash accumulated amount calculation unit for calculating an amount of accumulated ash by using, as the amount of accumulated ash, the total amount of accumulation which is estimated when the forced regeneration finishes. 1. An exhaust gas purification device comprising:a filter provided in an exhaust passage of an internal combustion engine and configured to collect particulate matter contained in an exhaust gas;a filter regenerating unit configured to execute a forced regeneration to burn and remove the particulate matter that has accumulated in the filter;a capacitance detecting unit configured to detect a capacitance of the filter;a total accumulated amount estimating unit configured to estimate a total accumulated amount of the particulate matter and an ash component, which are collected by the filter, based on the capacitance detected by the capacitance detecting unit; andan ash accumulated amount calculating unit configured to calculate an ash accumulated amount by using, as the ash accumulated amount, the total accumulated amount that is estimated by the total accumulated amount estimating unit when the forced regeneration by the filter regenerating unit finishes.2. The exhaust gas purification device according to further comprising a particulate matter accumulated amount calculating unit configured to calculate an amount of accumulated particulate matter collected by the filter by subtracting the ash accumulated amount claim 1 , which is calculated by the ash accumulated amount calculating unit claim 1 , ...

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Номер записи: 47
04-05-2017 дата публикации

Device and method comprising double reducing devices and a catalytically coated particle filter for treatment of an exhaust stream

Номер: US20170122166A1
Автор: Henrik BIRGERSSON, Magnus Nilsson
Принадлежит: SCANIA CV AB

An exhaust treatment system comprising: a first oxidation catalyst to oxidize nitrogen compounds and/or hydrocarbon compounds in said exhaust stream; a first dosage device downstream of said first oxidation catalyst to supply a first additive into said exhaust stream; a first reduction catalyst device downstream of said first dosage device for reduction of nitrogen oxides in said exhaust stream using said first additive; a particulate filter, comprising a catalytically oxidizing coating downstream of said first reduction catalyst device to catch soot particles and oxidize one or several of nitrogen oxide and incompletely oxidized carbon compounds in said exhaust stream; a second dosage device downstream of said particulate filter to supply a second additive into said exhaust stream; and a second reduction catalyst device downstream of said second dosage device for a reduction of nitrogen oxides in said exhaust stream, using at least one of said first and second additive.

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Номер записи: 48
04-05-2017 дата публикации

AMMONIA SLIP DETECTION

Номер: US20170122168A1
Автор: Angst Monika, Bartsch Leonhard, De Smet Frederik, Roettger Daniel, Vigild Christian Winge
Принадлежит:

Methods and systems are provided for detecting ammonia slip from a catalytic converter. In one example, a method may include recirculating exhaust gas containing ammonia and measuring only a NOconcentration of the recirculated exhaust gas following its combustion. 1. A method comprising:{'sub': 'x', 'measuring an exhaust NOconcentration, during an injection of a reductant from an injector, via a sensor located between an exhaust side of an engine and the injector;'}{'sub': 'x', 'comparing the exhaust NOconcentration to a baseline value; and'}{'sub': 'x', 'determining if ammonia is slipping through a catalyst in response to the exhaust NOconcentration being greater than the baseline value by a threshold amount.'}2. The method of claim 1 , wherein the baseline value is measured via the sensor prior to the injection.3. The method of claim 1 , wherein the baseline value is estimated based on EGR flow claim 1 , engine temperature claim 1 , engine speed claim 1 , and air/fuel ratio.4. The method of claim 1 , wherein the injection is terminated in response to the exhaust NOconcentration being greater than the baseline value by an amount greater than or equal to the threshold amount.5. The method of claim 1 , wherein the injection is adjusted to inject less reductant in response to the exhaust NOconcentration being greater than the baseline value by an amount less than the threshold amount.6. The method of claim 5 , wherein the injection is adjusted based on a difference between the exhaust NOconcentration and the baseline value claim 5 , wherein an injection amount is increasingly decreased as the difference increases.7. The method of claim 1 , wherein the catalyst is one or more of a selective catalytic reduction device and a lean NOtrap.8. The method of claim 7 , wherein the catalyst further comprises a particulate filter.9. The method of claim 1 , further comprising flowing low-pressure exhaust gas recirculate (LP-EGR) through a passage coupled to an exhaust passage ...

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Номер записи: 49
25-08-2022 дата публикации

OPTICAL SENSING OF NOx AND AMMONIA IN AFTERTREATMENT SYSTEMS

Номер: US20220268195A1
Автор: Liu Z. Gerald, Ottinger Nathan A., Xi Yuanzhou
Принадлежит: Cummins Emission Solutions Inc.

An aftertreatment system configured to reduce constituents of an exhaust gas produced by an engine comprises an aftertreatment component and an optical assembly. The optical assembly comprises an optical emitter configured to emit light onto a face of the aftertreatment component, and an optical detector configured to detect light reflected from the face of the aftertreatment component. A controller is configured to determine at least one of an amount of NOx gases or an amount of ammonia on the face of the aftertreatment component based on an optical parameter of the detected light that has reflected from the face of the aftertreatment component. 1. An aftertreatment system configured to reduce constituents of an exhaust gas produced by an engine , comprising:an aftertreatment component; an optical emitter configured to emit light onto a face of the aftertreatment component, and', 'an optical detector configured to detect light reflected from the face of the aftertreatment component; and, 'an optical assembly comprising{'sub': 'x', 'a controller configured to determine at least one of an amount of NOgases or an amount of ammonia on the face of the aftertreatment component based on an optical parameter of the detected light that has reflected from the face of the aftertreatment component.'}2. The aftertreatment system of claim 1 , wherein the controller is configured to determine the at least one of the amount of NOgases or the amount of ammonia on the face of the aftertreatment component based on a difference between a parameter of the light emitted from the optical emitter and a parameter of the detected light that has reflected from the face of the aftertreatment component.3. The aftertreatment system of claim 1 , wherein the emitted light has a wavelength in the infrared (IR) range.4. The aftertreatment system of claim 1 , wherein the emitted light has a wavelength in the ultraviolet-visible (UV-vis) range.5. The aftertreatment system of claim 1 , wherein the ...

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Номер записи: 50
31-07-2014 дата публикации

Method, system, and apparatus for diagnosing an exhaust aftertreatment component

Номер: US20140208721A1
Автор: Nassim Khaled, Richard Booth
Принадлежит: Cummins Intellectual Property Inc

According to one embodiment, an apparatus is disclosed for diagnosing a condition of a component of an exhaust aftertreatment system in exhaust receiving communication with an internal combustion engine where the exhaust aftertreatment system includes a selective catalytic reduction (SCR) catalyst. The diagnostic module is configured to determine a normalized tailpipe nitrogen-oxide NO x value based on a tailpipe NO x sensor signal and a ratio of an SCR inlet ammonia (NH 3 ) flow rate to an SCR inlet NO x flow rate. The apparatus also includes a component condition module configured to determine a condition of the component based on the normalized tailpipe NO x value.

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Номер записи: 51
12-05-2016 дата публикации

Method for operating an exhaust gas aftertreatment, device for controlling an exhaust gas after treatment, exhaust gas aftertreatment and internal combustion engine having exhaust gas after treatment

Номер: US20160131012A1
Автор: Andrea PROSPERO, Stefan Merk, Tim Späder
Принадлежит: MTU Friedrichshafen GmbH

A method and a device for operating an exhaust gas aftertreatment, wherein a diesel particulate filter is regenerated during the operation, in particular passively regenerated, wherein a corrected differential pressure is calculated from a current differential pressure across the diesel particulate filter at a current exhaust gas volumetric flow rate and with a current correction factor. The current correction factor is determined by determining a lower differential pressure in a predetermined time interval at a defined exhaust gas volumetric flow rate, in particular in a specified exhaust gas volumetric flow rate interval around the defined exhaust gas volumetric flow rate, and comparing the lower differential pressure with a specified current reference value and, depending thereon, calculating a new correction factor or retaining the previous correction factor as the current correction factor.

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Номер записи: 52
21-05-2015 дата публикации

On-board catalyst health monitoring and control system adaptation in internal combustion engines

Номер: US20150139860A1
Автор: Maruthi Narasinga Rao Devarakonda
Принадлежит: General Electric Co

Various embodiments include systems adapted to monitor catalyst deterioration. Some embodiments include a catalyst deterioration detection system including a pre-catalytic converter gas sensor, a post-catalytic converter gas sensor, at least one computing device in communication with the pre-catalytic converter and post-catalytic converter gas sensors, the at least one computing device configured to monitor catalyst deterioration by performing actions including estimating a catalyst gas storage level by comparing a difference between a pre-catalytic converter gas level from the pre-catalytic converter gas sensor and a post-catalytic converter gas level from the post-catalytic converter gas sensor, comparing the estimated catalyst gas storage level to a baseline catalyst gas storage level and determining that the catalyst is deteriorated in response to the baseline catalyst gas storage level exceeding the estimated gas storage level by a threshold difference.

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Номер записи: 53
02-05-2019 дата публикации

Exhaust gas purification system and exhaust gas purification method

Номер: US20190128166A1
Автор: Kunihiko Nakagaki
Принадлежит: NGK Insulators Ltd

An exhaust gas purification system and an exhaust gas purification method are disclosed. The exhaust gas purification system is provided with: an injector for injecting urea water, said injector being installed between a combustion device and a selective catalytic reduction (SCR) catalyst; a first gas sensor which is installed downstream of the SCR catalyst, and which detects the NO concentration and the NH 3 concentration in exhaust gas outputted from the SCR catalyst; and an opening amount control means for controlling the opening amount of the injector for injecting urea water.

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Номер записи: 54
28-05-2015 дата публикации

SYSTEM AND METHOD OF DEFULFURIZING LEAN NOx TRAP

Номер: US20150143799A1
Автор: Jin Ha Lee
Принадлежит: Hyundai Motor Co

A system of dusulfurizing an LNT may control desulfurization of the LNT provided in an apparatus of purifying exhaust gas, in which the LNT may be adapted to absorb nitrogen oxide (NOx) contained in the exhaust gas at a lean air/fuel ratio and to release the absorbed nitrogen oxide and reduce the nitrogen oxide contained in the exhaust gas or the released nitrogen oxide at a rich air/fuel ratio and the apparatus of purifying exhaust gas may further include a particulate filter trapping particulate matter contained in the exhaust gas as soot and regenerated by burning the trapped soot when a regeneration condition is satisfied, and a controller controlling desulfurization of the LNT and regeneration of the particulate filter.

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Номер записи: 55
08-09-2022 дата публикации

Jmz-12, a disordered aei/cha family of zeolites, its synthesis and use

Номер: US20220281752A1
Автор: Alessandro Turrina, Alexander Green, Guy R. CHANDLER, Jillian Collier, Kaneshalingam Arulraj, Maria Pia RUGGERI, Nicholas McNamara, Paul Phillips, Raquel GARCIA
Принадлежит: JOHNSON MATTHEY PLC

The present invention is directed to a method of preparing a synthetic crystalline material, designated as JMZ-12, with a framework built up by the disorder AEI and CHA structures, substantially free of framework phosphorous and prepared preferably in the absence of halides such as fluoride ions. Such method comprises the step of heating a reaction mixture under crystallization conditions for a sufficient period to form a disordered zeolite having both CHA and AEI topologies, wherein the reaction mixture comprises at least one source of aluminum, at least one source of silicon, a source of alkaline or alkaline-earth cations, and a structure directing agent containing at least one source of quaternary ammonium cations and at least one source of alkyl-substituted piperidinium cations in a molar ratio of 0.20 to about 1.4. The resulting zeolites are useful as catalysts, particularly when used in combination with exchanged transition metal(s) and, optionally, rare earth metal(s).

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Номер записи: 56
30-04-2020 дата публикации

EXHAUST GAS TREATMENT SYSTEMS AND METHODS FOR DIAGNOSING THE SAME

Номер: US20200131961A1
Автор: Esposito Raffaele, Irlando Francesco, Li Wei, MONTINARO Giovanni, Qi Gongshin, Ren Shouxian
Принадлежит:

Provided are methods for diagnosing a selective catalytic reduction device (SCR) of an exhaust gas treatment system, wherein the system includes an engine, an ammonia-generating catalytic device (AGC) configured to receive exhaust gas generated by the engine and capable of generating ammonia from rich exhaust gas, the SCR configured to receive exhaust gas and ammonia generated by the AGC, an upstream NOx sensor disposed upstream from the SCR, and a downstream NOx sensor disposed downstream from the SCR. The method includes increasing the temperature of the SCR to substantially empty all reductant stored within the SCR, during a diagnostic period, maintaining a rich engine operating condition and communicating the generated exhaust gas to the AGC and the SCR, determining a SCR reductant storage capacity based on measurements taken by the downstream NOx sensor during the diagnostic period, and optionally implementing a control action based on the determined storage capacity. 1. An exhaust gas treatment system , comprising:an internal combustion engine (ICE);an ammonia-generating catalytic device (AGC) configured to receive exhaust gas generated by the ICE and capable of generating ammonia from rich exhaust gas;a selective catalytic reduction device (SCR) configured to receive exhaust gas and ammonia generated by the AGC;an upstream NOx sensor disposed upstream from the SCR;a downstream NOx sensor disposed downstream from the SCR; and increase the temperature of the SCR to substantially empty all reductant stored within the SCR;', 'maintain a rich ICE operating condition; and', 'subsequently determine a SCR reductant storage capacity using the downstream NOx sensor., 'a controller configured to2. The exhaust gas treatment system of claim 1 , wherein the AGC comprises a diesel oxidation catalyst or a lean NOX trap.3. The exhaust gas treatment system of claim 1 , wherein the AGC comprises a platinum and/or palladium catalyst.4. The exhaust gas treatment system of claim 1 ...

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Номер записи: 57
24-05-2018 дата публикации

DIAGNOSTIC METHODS FOR A HIGH EFFICIENCY EXHAUST AFTERTREATMENT SYSTEM

Номер: US20180142590A1
Автор: Cunningham Michael J., Gupta Aniket, Haas Michael, Kothandaraman Govindarajan
Принадлежит:

A method includes interpreting NOx data indicative of an amount of NOx exiting an engine and an amount of NOx exiting an exhaust aftertreatment system coupled to the engine, determining a NOx conversion efficiency fault is present based on the amount of NOx exiting the engine and the amount of NOx exiting the exhaust aftertreatment system, and determining at least one of a selective catalytic reduction (SCR) catalyst of the exhaust aftertreatment system and a diesel particulate filter having a coating of a SCR reaction catalyst (DPF-SCR) of the exhaust aftertreatment system are responsible for the NOx conversion efficiency fault based on at least one of a reductant slip amount and a NOx conversion value across at least one of the SCR catalyst and the DPF-SCR. 1. A method , comprising:interpreting, by a processing circuit, nitrogen oxide (NOx) data indicative of an amount of NOx exiting an engine and an amount of NOx exiting an exhaust aftertreatment system coupled to the engine;determining, by the processing circuit, a NOx conversion efficiency fault is present based on the amount of NOx exiting the engine and the amount of NOx exiting the exhaust aftertreatment system; anddetermining, by the processing circuit, at least one of a selective catalytic reduction (SCR) catalyst of the exhaust aftertreatment system or a diesel particulate filter having a coating of a SCR reaction catalyst (DPF-SCR) of the exhaust aftertreatment system are responsible for the NOx conversion efficiency fault based on at least one of a reductant slip amount or a NOx conversion value across at least one of the SCR catalyst or the DPF-SCR.2. The method of claim 1 , further comprising determining claim 1 , by the processing circuit claim 1 , the DPF-SCR is faulty responsive to the reductant slip amount across the DPF-SCR being greater than an expected amount of reductant slip across the DPF-SCR.3. The method of claim 2 , further comprising interpreting claim 2 , by the processing circuit claim ...

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Номер записи: 58
24-05-2018 дата публикации

MODEL PREDICTIVE CONTROL FOR MULTI-CAN SELECTIVE CATALYTIC REDUCTION SYSTEM

Номер: US20180142593A1
Автор: ALFIERI Vincenzo, Hoyos Velasco Carlos Ildefonso, MAZZARA BOLOGNA Giuseppe, Wang Yue-Yun
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Disclosed are model predictive control (MPC) systems, methods for using such MPC systems, and motor vehicles with selective catalytic reduction (SCR) employing MPC control. An SCR-regulating MPC control system is disclosed that includes an NOx sensor for detecting nitrogen oxide (NOx) input received by the SCR system, catalyst NOx sensors for detecting NOx output for two SCR catalysts, and catalyst NH3 sensors for detecting ammonia (NH3) slip for each SCR catalyst. The MPC system also includes a control unit programmed to: receive desired can conversion efficiencies for the SCR catalysts; determine desired can NOx outputs for the SCR catalysts; determine maximum NH3 storage capacities for the SCR catalyst; calculate the current can conversion efficiency for each SCR catalyst; calculate an optimized reductant pulse-width and/or volume from the current can conversion efficiencies; and, command an SCR dosing injector to inject a reductant into an SCR conduit based on the calculated pulse-width/volume. 1. A model predictive control (MPC) system for regulating a selective catalytic reduction (SCR) system , the SCR system including first and second SCR catalysts , a storage tank storing a reductant , a conduit fluidly connecting the storage tank to the SCR catalysts , and a dosing injector for injecting the reductant into the conduit , the MPC system comprising:a fluid conduit NOx sensor configured to detect a current nitrogen oxide (NOx) input received by the conduit;first and second SCR catalyst NOx sensors each configured to detect a respective current NOx output of a respective one of the first and second SCR catalysts;first and second SCR catalyst NH3 sensors each configured to detect a respective current ammonia (NH3) slip volume of a respective one of the SCR catalysts; and receive an indication of a respective desired can conversion efficiency for each of the first and second SCR catalysts;', 'determine, from the first and second desired can conversion ...

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Номер записи: 59
16-05-2019 дата публикации

EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE AND EXHAUST GAS PURIFICATION METHOD FOR INTERNAL COMBUSTION ENGINE

Номер: US20190143271A1
Автор: NAGASHIMA Youhei
Принадлежит:

A first temperature which is a temperature of exhaust gas which has passed through an exhaust gas purification treatment device is detected during supply of urea water from a urea water supply device, and a second temperature which is a temperature of exhaust gas which has passed through a second exhaust gas purification treatment device in a state where an engine in the same operating state as when the first temperature is detected and the supply of the urea water from the urea water supply device is stopped is calculated from preset data. Further, an ammonia calorific value which is an amount of heat generated in an ammonia slip catalyst device by oxidation of ammonia is calculated based on the first temperature and the second temperature, and an ammonia slip amount from the selective reduction catalyst device is calculated based on the ammonia calorific value. 1. An exhaust gas purification system for an internal combustion engine , in which an exhaust passage of the internal combustion engine includes , in order from an upstream side: a urea water supply device; an exhaust gas purification treatment device; and a downstream temperature detecting device , the exhaust gas purification treatment device including: a selective reduction catalyst device group including at least one selective reduction catalyst device; and an oxidation catalyst device arranged at a downstream side of the selective reduction catalyst device group , detect, by the downstream temperature detecting device, a first temperature which is a temperature of exhaust gas which has passed through the exhaust gas purification treatment device during supply of urea water from the urea water supply device;', 'calculate, from preset data, a second temperature which is a temperature of exhaust gas which has passed through the exhaust gas purification treatment device in a state where the engine is in a same operating state as when the first temperature is detected and the supply of the urea water from ...

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Номер записи: 60
15-09-2022 дата публикации

ENGINE MULTI-PATH AFTERTREATMENT SYSTEM WITH RADIO FREQUENCY SENSORS AND METHODS, ASSEMBLIES, AND COMPONENTS THEREOF

Номер: US20220290602A1
Автор: RATTS Joshua L., RICHARDS Tyler V.
Принадлежит: CATERPILLAR INC.

Systems, methods, assemblies, and components for aftertreatment of an engine can comprise an aftertreatment module including an exhaust enclosure with at least one inlet port to receive exhaust gas, an outlet port to output exhaust gas, a first compartment, and a second compartment; a plurality of particulate filters extending in parallel with each other within the exhaust enclosure such that, for each of the particulate filters, an inlet of the particulate filter is in the first compartment and an outlet of the particulate filter is in the second compartment; and at least one radio frequency (RF) sensor set including an RF transmitter assembly and an RF receiver assembly. The RF transmitter assembly can be provided in the first compartment at the inlet of one of the particulate filters, and the RF receiver assembly can be provided at the outlet of said one particulate filter. 1. An engine aftertreatment system comprising:electronic control circuitry; and an exhaust enclosure with an inlet port to receive the exhaust gas from the internal combustion engine via a first exhaust conduit downstream of the internal combustion engine, an outlet port to output treated exhaust gas to a second exhaust conduit downstream of the internal combustion engine, a first compartment in fluid communication with the inlet port, a second compartment in fluid communication with the outlet port, and a divider between the first compartment and the second compartment,', 'a plurality of particulate filters extending in parallel with each other within the exhaust enclosure such that, for each of the plurality of particulate filters, an inlet of the particulate filter is in the first compartment and an outlet of the particulate filter is in the second compartment, and', 'a radio frequency (RF) sensor set operatively coupled to the electronic control circuitry and comprised of an RF transmitter assembly and an RF receiver assembly, each of the RF transmitter assembly and the RF receiver ...

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Номер записи: 61
31-05-2018 дата публикации

Vehicle control system

Номер: US20180149063A1
Автор: Katsuya Iwazaki, Kensei Hata, Takahito Endo, Yasuhiro Oshiumi, Yasuyuki Kato, Yushi SEKI
Принадлежит: Toyota Motor Corp

A vehicle control system vehicle control system to remove deposition from the purification system without generating noises and vibrations is provided. The vehicle control system comprises a controller that operates the vehicle having an engine autonomously, and that removes deposition from a purification system. The controller is configured to: obtain an amount of deposition on the purification system; determine a presence of a passenger in the vehicle; and execute the removal control when an amount of the deposition on the purification system exceeds a threshold value. The threshold value includes a first threshold value used when the vehicle is propelled while carrying a passenger, and a second threshold value used when the vehicle is propelled autonomously without carrying a passenger that is smaller than the first threshold value.

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Номер записи: 62
23-05-2019 дата публикации

EXHAUST GAS PURIFYING SYSTEM

Номер: US20190153922A1
Автор: Nagaoka Daiji, Sakamoto Takayuki
Принадлежит: Isuzu Motors Limited

A control apparatus (): creates a torque correction table indicating a relationship between a change rate of an intake air amount, a change of the main injection amount and the main injection timing of a fuel injection apparatus () in the torque value of a diesel engine () in a lean state; measures an intake air amount in a rich state by using an MAF sensor (); calculates a change rate of the measured intake air amount for the intake air amount in the lean state; obtains a correction value of the main injection amount and a correction value of the main injection timing of the fuel injection apparatus () based on the calculated change rate and the torque correction table; and performs an injection of the fuel in the rich state at the main injection amount and the main injection timing, corrected by the respective correction values. 1. An exhaust gas purifying system comprising:{'sub': x', 'x', 'x, 'a NOstorage-reduction catalyst that stores NOwhen exhaust gas flowing through an exhaust passage of an engine is in a lean state and reduces the stored NOwhen the exhaust gas is in a rich state;'}a fuel injection apparatus that injects fuel to a cylinder of the engine;an MAF sensor that is installed in an intake passage of the engine; anda control apparatus, whereinin response to a request of a rich spike, the control apparatus is configured to:switch the exhaust gas from the lean state to the rich state,create a torque correction table indicating a relationship between a change rate of an intake air amount, a change of a main injection amount and a change of a main injection timing of the fuel injection apparatus in a torque value of the engine in the lean state,measure an intake air amount in the rich state by using the MAF sensor,calculate a change rate of the measured intake air amount with respect to the intake air amount in the lean state,obtain a correction value of the main injection amount and a correction value of the main injection timing of the fuel injection ...

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Номер записи: 63
14-06-2018 дата публикации

METHOD AND APPARATUS FOR CONTROLLING REDUCTANT INJECTION INTO AN EXHAUST GAS FEEDSTREAM FROM AN INTERNAL COMBUSTION ENGINE

Номер: US20180163589A1
Автор: DAVID Giovanni, Lauritano Luca, Spina Giuseppe Antonio
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

An exhaust aftertreatment system includes first and second selective catalytic reduction devices (SCRs) and a single reductant injection system. A total ammonia storage capacity and an ammonia storage level are determined for the first and second SCRs, and determine a total SCR ammonia storage level for the first and second SCRs based upon the ammonia storage level on the first and second SCRs. A first storage error is determined, and a second storage error is determined based upon an ammonia storage level and an ammonia storage capacity for the second SCR. A second reductant dosing rate is determined based upon the second storage error. The reductant injection system injects reductant into the exhaust gas feedstream based upon the second reductant dosing rate when the second storage error indicates an imbalance between the ammonia storage on the first SCR and the ammonia storage on the second SCR. 1. An exhaust aftertreatment system configured to purify an exhaust gas feedstream for an internal combustion engine , comprising:first and second selective catalytic reduction devices (SCRs), wherein the first SCR is disposed upstream relative to the second SCR;a reductant injection system disposed to inject reductant into the exhaust gas feedstream upstream relative to the first SCR;a first temperature sensor disposed to monitor a first temperature of the exhaust gas feedstream upstream relative to the first SCR;a second temperature sensor disposed to monitor a second temperature of the exhaust gas feedstream upstream relative to the second SCR; anda controller operatively connected to the reductant injection system and in communication with the first and second temperature sensors and the internal combustion engine, determine a total ammonia storage capacity for the first and second SCRs;', 'determine an ammonia storage level on the first SCR and an ammonia storage level on the second SCR;', 'determine a total SCR ammonia storage level for the first and second SCRs ...

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Номер записи: 64
30-05-2019 дата публикации

CONTROL RESET AND DIAGNOSTIC TO MAINTAIN TAILPIPE COMPLIANCE

Номер: US20190162094A1
Автор: Binetti Giulio, MAZZARA BOLOGNA Giuseppe, Smith Michael A.
Принадлежит:

A method, control system, and vehicle system configured to control a selective catalyst reduction (SCR) system subtracts an amount of NOpresent in a tailpipe upstream of the SCR system from an amount of NOpresent in the tailpipe downstream of the SCR injector. A cumulative difference may be determined based on integrating the subtracted NOvalue. The method, control system, and vehicle system are configured to determine whether the cumulative difference exceeds a control threshold, and to set a selected upstream NOvalue as a predetermined model upstream NOamount if the cumulative difference exceeds the control threshold, but to set the selected upstream NOvalue as the determined upstream NOamount if the cumulative difference does not exceed the control threshold. Thus, the system is reset to the model when downstream NOvalues exceed upstream NOvalues above a threshold, to bring the system back within control. 1. A method of controlling a selective catalytic reduction reductant delivery system , the method comprising:{'sub': x', 'x, 'determining an amount of nitrogen oxide compounds (NO) present in a tailpipe at a first location upstream of a reductant injector to define a determined upstream NOamount;'}{'sub': x', 'x, 'determining an amount of NOpresent in the tailpipe at a second location downstream of the reductant injector to define a determined downstream NOamount;'}{'sub': x', 'x', 'x, 'subtracting the determined upstream NOamount from the determined downstream NOamount to define a subtracted NOvalue;'}{'sub': 'x', 'determining a cumulative difference based on the subtracted NOvalue;'}determining whether the cumulative difference exceeds a control threshold;{'sub': x', 'x, 'setting a selected upstream NOvalue as a predetermined model upstream NOamount if the cumulative difference exceeds the control threshold; and'}{'sub': x', 'x, 'setting the selected upstream NOvalue as the determined upstream NOamount if the cumulative difference does not exceed the control ...

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Номер записи: 65
21-05-2020 дата публикации

Exhaust gas detection and treatment, and related systems

Номер: US20200157994A1
Автор: Markus Iivonen
Принадлежит: AGCO International GMBH

A method for calculating the relative ratios of NH 3 and NO x in exhaust gases to detect NH 3 slip using NO x sensors includes measuring a first NO x level at an upstream NO x sensor, administering a first predetermined dose of urea to the exhaust gases, measuring a second NO x level at a downstream NO x sensor, administering a second predetermined dose of urea to the exhaust gases, measuring a third NO x level at the downstream NO x sensor, calculating a difference between the second NO x level and the third NO x level, and comparing the difference between the second NO x level and the third NO x level to a lookup table to determine a ratio of a concentration of NH 3 to a concentration of NO x in the exhaust gases. Related systems and methods are also disclosed.

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Номер записи: 66
21-06-2018 дата публикации

METHOD FOR MOBILISING ASH IN AN EXHAUST-GAS PARTICLE FILTER

Номер: US20180171844A1
Автор: CHATTERJEE Daniel, LEOPOLD Raphael-David, MALETIC Boban, MANTAJ Viktor, MARKERT Norbert, NEUSCHELER Michael, PROSPERO Andrea, RAUTER Michael, RUSCH Klaus, Schneider Alexander, SCHOLZ John, SPÄDER Tim, WOLMAN Hilmar, ZITZLER Günter
Принадлежит:

A method for execution with an exhaust-gas particle filter which is operated with an exhaust-gas aftertreatment system, wherein the exhaust-gas particle filter has a filter wall along which exhaust gas is conducted for filtering purposes; wherein the method includes a regeneration phase with the steps: a) setting a soot load on the exhaust-gas particle filter, wherein the set soot load effects the formation of a soot layer on ash deposited on the filter wall; and b) subsequently mobilising the deposited ash by burning off the formed soot layer during the course of an active regeneration of the exhaust-gas particle filter. 110-. (canceled)11. A method performed with an exhaust particulate filter operated with an exhaust gas aftertreatment system , wherein the exhaust particulate filter comprises a filter wall , along which exhaust gas is led for filtering , wherein the method comprises a regeneration phase having the steps of:a) setting of a soot load on the exhaust particulate filter, wherein the set soot load gives rise to formation of a layer of soot on top of ash deposited on the filter wall; andb) subsequent mobilization of the deposited ash by burning off the formed layer of soot during an active regeneration of the exhaust particulate filter.12. The method according to claim 11 , whereinstep a) and step b) immediately follow one another during the regeneration phase; orthe set soot load is maintained at a predefined value over a period between step a) and step b).13. The method according to claim 11 , includinginitiating the regeneration phase with step a), as soon as a threshold value that varies as a function of the load on the exhaust particulate filter is reached; and/orwhen initiating the regeneration phase with step a) account is taken of an effective filter volume of the exhaust particulate filter.14. The method according to claim 11 , further comprising increasing the soot load in a step c) claim 11 , which immediately follows the active regeneration ...

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Номер записи: 67
22-06-2017 дата публикации

METHODS AND SYSTEMS FOR INTRODUCING REDUCTANT INTO AN EXHAUST PASSAGE

Номер: US20170175607A1
Автор: Angst Monika, De Smet Frederik
Принадлежит:

Methods and systems are provided for an exhaust passage having a plurality of catalysts. In one example, a method may include injecting reductant via one or more injectors of the exhaust passage and monitoring injection conditions by flowing exhaust gas to the engine. 1. An arrangement in a motor vehicle having an internal combustion engine with an exhaust tract from which a low-pressure exhaust-gas recirculation system branches off and in which an exhaust-gas aftertreatment system is arranged , the exhaust-gas aftertreatment system comprisinga diesel oxidation catalyst;a first selective catalytic reduction device downstream of the diesel oxidation catalyst and upstream of an intersection in the exhaust tract from which the low-pressure exhaust-gas recirculation branches off;a second catalytic reduction device located in the exhaust tract downstream of the intersection;at least one first reducing agent feed device which is arranged upstream of the first selective catalytic reduction device and downstream of the diesel oxidation catalyst; andat least one second reducing agent feed device which is arranged downstream of the branching point of the exhaust-gas recirculation system and upstream of the second catalytic reduction device.2. The arrangement of claim 1 , wherein the first reducing agent feed device and the second reducing agent feed device are designed for introducing gaseous ammonia or an aqueous ammonia solution into the exhaust tract.3. The arrangement of claim 1 , wherein the second reducing agent feed device is configured to inject gaseous ammonia claim 1 , aqueous ammonia solution claim 1 , or fuel claim 1 , and is upstream of a nitrogen oxide trap catalyst.4. The arrangement of claim 3 , wherein the nitrogen oxide trap catalyst is upstream of the second selective catalytic reduction device and corresponds to the second reducing agent feed device claim 3 , and the reducing agent that is introduced is gaseous ammonia produced in the second nitrogen oxide ...

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Номер записи: 68
30-06-2016 дата публикации

EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE

Номер: US20160186627A1
Автор: HABA Yuki, Nozaki Yusuke, Yoshida Kohei
Принадлежит: TOYOTA JIDOSHA KABUSHIKI KAISHA

In an internal combustion engine, a hydrocarbon feed valve () and an exhaust purification catalyst () are arranged in an engine exhaust passage. When releasing the stored NOfrom the exhaust purification catalyst (), usually combustion gas of a rich air-fuel ratio is generated in the combustion chamber () to make the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst () rich. When releasing the stored NOfrom the exhaust purification catalyst () in case where the temperature of the exhaust purification catalyst () is low, the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst () is made rich by injecting hydrocarbons from the hydrocarbon feed valve (). 1. An exhaust purification system of an internal combustion engine comprising an exhaust purification catalyst arranged in an engine exhaust passage and a hydrocarbon feed valve arranged in the engine exhaust passage upstream of the exhaust purification catalyst , a precious metal catalyst being carried on an exhaust gas flow surface of the exhaust purification catalyst , a basic layer being formed around the precious metal catalyst , and an air-fuel ratio of an exhaust gas flowing into the exhaust purification catalyst being made rich when releasing NOwhich is stored in the basic layer from the exhaust purification catalyst , wherein{'sub': 'x', 'when releasing the stored NOX from the exhaust purification catalyst, the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made rich by generating combustion gas of a rich air-fuel ratio in a combustion chamber or the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made rich by injecting hydrocarbons from the hydrocarbon feed valve into the engine exhaust passage, and, in case where hydrocarbons are injected from the hydrocarbon feed valve into the engine exhaust passage to release the stored NOfrom the exhaust purification catalyst, an amount of ...

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Номер записи: 69
13-06-2019 дата публикации

METHODS FOR CONTROLLING SELECTIVE CATALYTIC REDUCTION SYSTEMS

Номер: US20190178131A1
Автор: Dean Charles E., Funk Sarah, Lee Po-I, Quigley David P.
Принадлежит:

A selective catalytic reduction device (SCR) system performs intrusive steady state dosing correction (SSDC) when a NOx error between a predicted and measured downstream NOx value exceeds a threshold. In SSDC, if NOx breakthrough or NH3 slip is detected above a SSDC threshold, a short term reductant dosing adaptation occurs. Optionally long term dosing adaptations occur if the magnitude of previous short term adaptations exceed a short term adaptation threshold. If SSDC is insufficiently improving SCR performance based on the number of intrusive events occurring within a period of time and the change in NOx error during the time period, a method includes modifying the SSDC protocol by one or more of increasing the duration of short term adaptations, decreasing the SSDC threshold, and reducing the short term adaptation threshold. The method further includes subsequently inhibiting intrusive events from occurring. 1. A method for controlling a selective catalytic reduction device (SCR) system , wherein the SCR is configured to receive exhaust gas and reductant , and the system further includes a controller capable of predicting NOx concentration downstream of the SCR and controlling reductant dosing to the SCR via a computer implemented chemical model , wherein iteratively during steady state conditions the system performs a steady state dosing correction (SSDC) protocol by comparing a SCR downstream NOx measurement with a predicted NOx value to determine a NOx error , initiating an intrusive event by modulating reductant dosing to determine a degree of NOx breakthrough or reductant slip occurring prior to initiation of the intrusive event if the NOx error exceeds a NOx error threshold , making a short term adaptation to reductant dosing in order to reduce NOx breakthrough or reductant slip for a period of time as determined by a plausibility timer if the degree of NOx breakthrough or reductant slip exceeds a respective NOx breakthrough threshold or reductant slip ...

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Номер записи: 70
09-07-2015 дата публикации

Abnormality diagnosis device and exhaust gas purification device of internal combustion engine

Номер: US20150192048A1
Автор: Kenichi Tanioka
Принадлежит: Bosch Corp

An abnormal diagnosis device capable of specifying abnormality of an ammonia slip catalyst provided on a downstream side of a selection reduction catalyst, and an exhaust gas purification device of an internal combustion engine including the abnormal diagnosis device are provided. A purification rate diagnosis unit which diagnoses an NO x purification rate in the exhaust gas purification device, and an abnormality determination unit which specifies abnormality of the ammonia slip catalyst based on a diagnostic result of the NO x purification rate obtained at the time of a high load operation of the internal combustion engine and a diagnostic result of the NO x purification rate obtained at the time of a low load operation of the internal combustion engine are provided.

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Номер записи: 71
29-06-2017 дата публикации

Filter failure diagnostic device for an internal combustion engine

Номер: US20170184003A1
Автор: Makoto Ogiso, Taiga Hagimoto, Tomoyuki Kogo
Принадлежит: Toyota Motor Corp

A device is provided, which makes it possible to perform a failure diagnostics for a filter more accurately even in the case of an internal combustion engine which is constructed to be capable of using both of gaseous fuel and liquid fuel. The device of the invention comprises judging means which judges any failure of the filter by comparing the added-up amount of the particulate matter contained in the exhaust gas as detected by a PM amount detecting sensor during a predetermined period and the added-up amount of the particulate matter contained in the exhaust gas as estimated by PM amount estimating means during the predetermined period, wherein the PM amount estimating means estimates the added-up amount of the particulate matter contained in the exhaust gas on the basis of the predetermined parameter and only a fuel injection amount of the liquid fuel out of a fuel injection amount of the gaseous fuel and the fuel injection amount of the liquid fuel.

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Номер записи: 72
04-06-2020 дата публикации

Methods for operating and diagnosing internal combustion engine exhaust gas treatment systems

Номер: US20200173327A1
Автор: Anirban Sett, Gongshin Qi, Rahul Mital, Shouxian Ren
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Internal combustion engine (ICE) exhaust gas treatment systems include the ICE having one or more cylinders configured to receive a mixture of air and fuel defined by an air to fuel ratio (AFR) for combustion therein, a control module configured to control the AFR, a diesel oxidation catalyst (DOC) configured to receive exhaust gas generated by the ICE and oxidize NOx species within the exhaust gas, and a selective catalytic reduction device (SCR) configured to receive exhaust gas from the DOC. Methods for operating and diagnosing such systems include determining, via the control module, a baseline value of a SCR performance parameter which is unsuitable, changing, via the control module, the AFR to change the DOC outlet NO2:NOx ratio, subsequently assessing a second value of the SCR performance parameter, and implementing a control action based on the second value of the SCR performance parameter.

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Номер записи: 73
07-07-2016 дата публикации

Engine Exhaust Gas Purifier

Номер: US20160194992A1
Автор: Keigo Hara, Shigeki SHIRAI, Tomoaki SHUTO
Принадлежит: CATERPILLAR SARL

In an engine exhaust gas purifier having a urea-SCR-catalyst and an injector, the urea-SCR-catalyst is regenerated periodically to remove stack up sulfur caused by the diesel fuel, by stopping supply of urea water, and raising exhaust gas temperature to heat the catalyst. The injector locates in the downstream of cooling wind of a variable speed cooling fan which creates variable cooling wind based on the temperature of the cooling component like radiator, oil cooler, after cooler of the engine. At the regeneration of the urea-SCR-catalyst, controller changes preset fan-speed to higher speed to increase cooling wind to inhibit overheating.

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Номер записи: 74
05-07-2018 дата публикации

METHODS AND SYSTEMS FOR AN EXHAUST GAS AFTERTREATMENT SYSTEM

Номер: US20180187583A1
Автор: Angst Monika, Boerensen Christoph, Carberry Brendan, De Smet Frederik, GOEBEL Felix, Linzen Frank, Roemer Dirk, Smirnov Evgeny
Принадлежит:

Methods and systems are provided for an exhaust gas aftertreatment system. In one example, a method may include limiting ammonia desorption from a catalyst in response to an increase in driver demand by activating an electric motor. 1. A method comprising:activating an electric motor and flowing low-pressure exhaust gas recirculation (LP-EGR) flow for a threshold duration in response to an ammonia slip risk of a catalyst being present; anddeactivating the electric motor, shutting off LP-EGR flow, and flowing HP-EGR in response to the ammonia slip risk being present after the threshold duration.2. The method of claim 1 , the ammonia slip risk is based on an increase in driver demand claim 1 , where the increase in driver demand results in engine conditions promoting desorption of ammonia stored on the catalyst.3. The method of claim 1 , wherein the catalyst is arranged upstream of a LP-EGR passage and downstream of a HP-EGR passage.4. The method of claim 3 , wherein the catalyst is a first selective reduction catalyst claim 3 , further comprising a second selective reduction catalyst arranged downstream of the first selective reduction catalyst and the LP-EGR passage.5. The method of claim 1 , wherein activating the electric motor further includes decreasing engine speed and torque.6. The method of claim 1 , wherein deactivating the electric motor further includes increasing engine speed and torque and where ammonia slips from the catalyst.7. A system comprising:an engine coupled to an exhaust passage housing a first catalyst upstream of a second catalyst relative to a direction of exhaust gas flow;a HP-EGR passage branching from the exhaust passage at a location upstream of the first catalyst and a LP-EGR passage branching from the exhaust passage at a location between the first and second catalysts, and where the LP-EGR passage houses a third catalyst; anda controller with computer-readable instructions stored on non-transitory memory thereof that when executed ...

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Номер записи: 75
06-07-2017 дата публикации

EXHAUST PURIFICATION SYSTEM

Номер: US20170191394A1
Автор: AMAGASAKI Shin, Minezawa Masanobu, Oomura Yasuhisa
Принадлежит:

An exhaust purification system that includes a selective catalytic reduction to purify NOx contained in an exhaust gas by using ammonia produced from urea water and an NOx sensor to acquire a value of the NOx contained in the exhaust gas, and the exhaust purification system includes: a reach time measurement unit that measures a reach time of the NOx value acquired by the NOx sensor, the reach time being a required time for the NOx value to reach, from a first predetermined determinative NOx value, a second predetermined determinative NOx value, which is higher than the first determinative NOx value; and a determination unit that determines that malfunction occurs in the NOx sensor when the reach time measured by the reach time measurement unit is equal to or shorter than a first predetermined determinative time. 1. An exhaust purification system that includes a selective catalytic reduction that is provided in an exhaust passage of an internal combustion engine to purify NOx contained in an exhaust gas by using ammonia produced from urea water as a reducing agent and an NOx sensor that is provided in the exhaust passage to acquire a value of the NOx contained in the exhaust gas , the exhaust purification system characterized by comprising:a reach time measurement unit that measures a reach time of the NOx value acquired by the NOx sensor, the reach time being a required time for the NOx value to reach, from a first predetermined determinative NOx value, a second predetermined determinative NOx value, which is higher than the first determinative NOx value; anda determination unit that determines that malfunction occurs in the NOx sensor when the reach time measured by the reach time measurement unit is equal to or shorter than a first predetermined determinative time.2. The exhaust purification system according to claim 1 ,wherein the determination unit determines that a temporary response defection occurs in the NOx sensor when the reach time measured by the reach ...

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Номер записи: 76
11-06-2020 дата публикации

Method and system for purifying exhaust gas for prevention of nh3 slip

Номер: US20200182119A1
Автор: Hyo-Sang Cho, Jun-Yong Lee, Kyoung-Chan HAN, Kyoung-Min Lee
Принадлежит: Hyundai Motor Co, Kia Motors Corp

A system for purifying exhaust gas includes a controller to predict a possibility of ammonia (NH3) slip occurring at the rear end of a selective catalytic reduction on a diesel particulate filter (SDPF) by comparing a convective heat transfer value (h) with a first predetermined value. The controller determines whether an engine is rapidly accelerated, and performs a control to prevent introduction of ammonia downstream of the SDPF when the ammonia slip is predicted to occur.

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Номер записи: 77
13-07-2017 дата публикации

Engine control systems and methods for nitrogen oxide reduction

Номер: US20170198652A1
Автор: Arun S. Solomon, David P. Sczomak, Robert J. Gallon, Robert S. McAlpine
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

A fuel control module controls fuel injection of an engine based on a predetermined lean air/fuel ratio. The predetermined lean air/fuel ratio is fuel lean relative to a stoichiometric air/fuel ratio for the fuel. A cylinder control module selectively deactivates opening of intake and exhaust valves of M cylinders of the engine to increase removal of nitrogen oxide (NOx) from exhaust. M is an integer greater than 0 and less than a total number of cylinders of the engine. The fuel control module further: disables fueling of the M cylinders while opening of the intake and exhaust valves of the M cylinders is deactivated; and, while fueling of the M cylinders is disabled and opening of the intake and exhaust valves of the M cylinders is deactivated, controls fuel injection of other cylinders based on a predetermined rich air/fuel ratio that is fuel rich relative to the stoichiometric air/fuel ratio.

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Номер записи: 78
27-06-2019 дата публикации

REGENERATION SYSTEM, VEHICLE COMPRISING THE SAME AND REGENERATION METHOD

Номер: US20190195104A1
Автор: Kapp Andreas, Lang Stefan, Schreiber Michael
Принадлежит:

A regeneration system of a combustion engine of a vehicle includes a speed control device configured to determine an acceleration time of the vehicle to a set speed, a NOx trap configured to reduce nitrogen oxides produced by the combustion engine, and a trigger configured to detect a loading level of the nitrogen oxides of the NOx trap in an exhaust gas produced by the combustion engine during operation. In further, the speed control device is configured to communicate with the trigger, wherein a regeneration of the NOx trap is configured to start in case the acceleration time of the vehicle to the set speed is at least equal to a regeneration time of the NOx trap at the loading level of the nitrogen oxides. 1. A regeneration system of a combustion engine of a vehicle comprising:a speed control device configured to determine an acceleration time of the vehicle to a set speed;a NOx trap configured to reduce nitrogen oxides produced by the combustion engine; anda trigger configured to detect a loading level of the nitrogen oxides of the NOx trap,wherein the speed control device is configured to communicate with the trigger, andwherein a regeneration of the NOx trap is configured to start in case the acceleration time of the vehicle to the set speed is at least equal to a regeneration time of the NOx trap at the loading level of the nitrogen oxides.2. The regeneration system according to claim 1 , wherein the loading level of the nitrogen oxides of the NOx trap is bigger than 40% with respect to a saturation level of the NOx trap.3. The regeneration system according to claim 2 , wherein the regeneration time of the NOx trap at the loading level of the nitrogen oxides is shorter than a further regeneration time of the NOx trap at the saturation level.4. The regeneration system according to claim 3 , wherein the regeneration time of the NOx trap at the loading level of the nitrogen oxides is at least two seconds shorter than the further regeneration time of the NOx trap ...

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Номер записи: 79
27-06-2019 дата публикации

ABNORMALITY DIAGNOSIS SYSTEM FOR AN EXHAUST GAS PURIFICATION APPARATUS

Номер: US20190195107A1
Автор: FURUI Kenji, Kidokoro Toru, OGISO Makoto, SHIRASAWA Takeru
Принадлежит: TOYOTA JIDOSHA KABUSHIKI KAISHA

When an abnormality diagnosis of an SCR catalyst is carried out, diagnostic supply control is carried out in such a manner that the first estimated adsorption amount, which is an amount of adsorption of ammonia in the SCR catalyst at the time when the SCR catalyst is assumed to be in a predetermined abnormal state, becomes equal to or more than a first predetermined adsorption amount, and the second estimated adsorption amount, which is an amount of adsorption of ammonia in the SCR catalyst at the time when the SCR catalyst is assumed to be in a predetermined normal state, becomes smaller than a second predetermined adsorption amount. Then, supply decreasing control to decrease an amount of adsorption of ammonia in the SCR catalyst is carried out, after the end of the execution of the diagnostic supply control. 1. An abnormality diagnosis system for an exhaust gas purification apparatus which includes:an NOx selective reduction catalyst that is arranged in an exhaust passage of the internal combustion engine, and reduces NOx in an exhaust gas by using ammonia as a reducing agent; andan ammonia supply device that is arranged in the exhaust passage at the upstream side of the NOx selective reduction catalyst, and supplies ammonia to the NOx selective reduction catalyst;wherein the abnormality diagnosis system is applied to the exhaust gas purification apparatus and comprises a controller comprising at least one processor configured to carry out an abnormality diagnosis of the NOx selective reduction catalyst; whereinthe controllerdetects a concentration of ammonia in the exhaust gas at the downstream side of the NOx selective reduction catalyst;estimates a first estimated adsorption amount which is an amount of adsorption of ammonia in the NOx selective reduction catalyst at the time when the NOx selective reduction catalyst is assumed to be in a predetermined abnormal state;estimates a second estimated adsorption amount which is an amount of adsorption of ammonia in ...

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Номер записи: 80
18-06-2020 дата публикации

Method for Operating an Internal Combustion Engine of a Motor Vehicle and Arrangement of a Particulate Filter in an Exhaust System of a Motor Vehicle

Номер: US20200191079A1
Автор: LANZERATH Peter, SCHWAAB Julius
Принадлежит:

In a method for operating an internal combustion engine of a motor vehicle, exhaust gas from the internal combustion engine is fed to a particulate filter of the motor vehicle. Until a predetermined filtration rate of the particulate filter is reached, a temporary interruption of a fuel supply to the internal combustion engine is prevented in an overrun mode of the motor vehicle if a temperature of the exhaust gas in the particulate filter is greater than a predetermined threshold value of the temperature. An arrangement of the particulate filter in an exhaust system of the motor vehicle is also described. 110-. (canceled)11. A method for operating an internal combustion engine of a motor vehicle , comprising:supplying exhaust gas from the internal combustion engine to a particulate filter of the motor vehicle, andpreventing a temporary interruption of a fuel supply to the internal combustion engine if a temperature of the exhaust gas in the particulate filter is greater than a predetermined threshold value of the temperature until a predetermined filtration rate of the particulate filter is reached in an overrun mode of the motor vehicle.12. The method according to claim 11 , wherein interruption of the fuel supply is prevented by operating the internal combustion engine with a combustion air ratio at which there is a lack of air or with a stoichiometric combustion air ratio.13. The method according to claim 11 , wherein a value of at least 475 degrees Celsius is used as the predetermined temperature threshold.14. The method according to claim 11 , wherein a value of at least 500 degrees Celsius is used as the predetermined temperature threshold.15. The method according to claim 11 , wherein a filtration rate of at least 90 percent with regard to a number of particles is used as the predetermined filtration rate of the particulate filter.16. The method according to claim 11 , wherein the filtration rate is determined depending on a loading of the particulate filter ...

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Номер записи: 81
20-07-2017 дата публикации

EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE

Номер: US20170204763A1
Автор: Imai Daichi, Ito Kazuhiro, Nishioka Hiromasa, NOTAKE Yasumasa, Otsuki Hiroshi, Tsukamoto Yoshihisa
Принадлежит:

An exhaust purification system including a particulate filter , a selective reduction catalyst provided at a downstream side from the filter, an ammonia ingredient feed device which feeds an ammonia ingredient to the selective reduction catalyst, a control device which controls the amount of the ammonia ingredient which is adsorbed at the selective reduction catalyst to become a target adsorption amount, and a filter regeneration system which performs filter regeneration processing to remove PM which has built up on the particulate filter when an execution start condition stands. When removal of PM is demanded, so long as the execution start condition of the filter regeneration processing by the filter regeneration system does not stand, the target adsorption amount is decreased a plurality of times in stages, and the execution start condition of the filter regeneration processing is changed to a different condition at each stage of the target adsorption amount. 1. An exhaust purification system of an internal combustion engine , comprising:a particulate filter which is provided in an engine exhaust passage;a selective reduction catalyst which is provided in the engine exhaust passage at a downstream side from said particulate filter in a direction of exhaust flow;an ammonia ingredient feed device which feeds an ammonia ingredient to said selective reduction catalyst;a control device which controls the amount of feed of ammonia ingredient from said ammonia ingredient feed device so that the amount of the ammonia ingredient which is adsorbed at said selective reduction catalyst becomes a target adsorption amount; anda filter regeneration system which performs filter regeneration processing to remove PM which has built up on said particulate filter, when an execution start condition of the filter regeneration processing stands,wherein when removal of PM which has built up on said particulate filter is demanded, so long as the execution start condition of the filter ...

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Номер записи: 82
19-07-2018 дата публикации

INTEGRATED START/STOP AND AFTER-TREATMENT CONTROLS

Номер: US20180202341A1
Автор: "OBRIEN JOHN P.", Cochran Robert Edward, Piper Erik L.
Принадлежит:

An apparatus and method for controlling engine start/stop operations based at least in part on considerations relating to the thermal management of an exhaust gas after-treatment system. A control system may monitor and/or predict conditions and/or properties of the after-treatment system, including conditions related to the thermal management of a selective catalytic reduction system and the properties of an exhaust gas stream that has been released from an internal combustion engine and into the after-treatment system. Such conditions may be evaluated in determining whether the thermal management of the after-treatment system is at, or will be in, a condition that may accommodate a start/stop operation of the internal combustion engine with minimal, if any, adverse impact on the thermal management of the after-treatment system. Such an evaluation may, in at least certain situations, provide at least a consideration as to whether to de-activate or activate start/stop operations. 1. A method comprising:releasing, from an internal combustion engine, an exhaust gas stream into an exhaust gas after-treatment system;managing one or more thermal properties of the exhaust gas after-treatment system; andinhibiting start/stop operations of the internal combustion engine based on a status of the managed one or more thermal properties of the exhaust gas after-treatment system.2. The method of claim 1 , further including the step of detecting one or more characteristics of the released exhaust gas stream.3. The method of claim 2 , wherein the step of managing one or more thermal properties comprises managing claim 2 , using at least the detected one or more characteristics of the released exhaust gas stream claim 2 , the operation of a selective catalytic reduction system.4. The method of claim 3 , wherein the status of the managed one or more thermal properties comprises an inlet temperature of the exhaust gas stream in the selective catalytic reduction system relative to a ...

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Номер записи: 83
27-07-2017 дата публикации

Method of monitoring an exhaust gas aftertreatment system

Номер: US20170211444A1
Автор: Frederik De Smet, Kim Ford, Marcus Timothy Davies
Принадлежит: FORD GLOBAL TECHNOLOGIES LLC

The subject matter of the disclosure relates to a method of diagnosing NOx storage catalyst during the operation of a motor vehicle. The method uses two diagnosis sub-methods having various sensitivities with respect to sulfur contamination of the NOx storage catalyst. The results of the two sub-methods are used to ascertain proportions of aging of the NOx storage catalyst resulting from thermal aging and sulfur contamination.

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Номер записи: 84
09-10-2014 дата публикации

Enhanced real-time ammonia slip detection

Номер: US20140301925A1
Автор: Dean Pennala, Devesh Upadhyay, Frank Korpics, Hao Wu
Принадлежит: FORD GLOBAL TECHNOLOGIES LLC

Systems and methods for detecting ammonia slip in an exhaust system based upon transient NOx sensor responses are described. In one example method, an exhaust system allocates tailpipe NOx sensor output to NOx and NH 3 levels responsive to the transient sensors using a segment length method that processes the transient signals based on the total segment lengths calculated within a window. A ratio of segment lengths relative to a threshold is determined for a measured and expected NOx rate of change downstream of an SCR that is further used to determine a probability of NOx and NH 3 based on the measured sensor activities, and a controller is included to adjust one or more parameters based on the allocation and changes of sensor output.

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Номер записи: 85
04-07-2019 дата публикации

NH3 SLIP DETECTION USING NOX SENSOR

Номер: US20190203624A1
Автор: Gong Jinqian, Rajagopal Varun R.
Принадлежит: Cummins Emission Solutions Inc.

System and methods for detecting NHslip using cross-sensitivity of an NOsensor may include accessing a temperature value for a catalyst and determining the temperature value for the catalyst exceeds a predetermined value. If the temperature exceeds the predetermined value, a system-out NOmeasurement signal from the system-out NOsensor and an estimated system-out NOvalue are used to calculate a delta value. A flag is set indicative of NHslip for an exhaust system responsive to an average of delta values for a predetermined period of time exceeding a predetermined value. If the temperature does not exceed the predetermined value, then an average of a plurality of system-out NOmeasurement signals can be calculated and a flag is set indicative of NHslip responsive to the calculated average for a predetermined period of time exceeding a predetermined value. 1. A method for detecting NHslip using a system-out NOsensor comprising:accessing a temperature value for a catalyst; [{'sub': x', 'x, 'accessing a plurality of system-out NOmeasurement signals from the system-out NOsensor,'}, {'sub': 'x', 'determining a plurality of estimated system-out NOvalues,'}, {'sub': x', 'x, 'calculating a plurality of delta values over a first predetermined period of time, based on the system-out NOmeasurement signals and the estimated system-out NOvalues, and'}, {'sub': '3', 'setting a flag indicative of NHslip for an exhaust system responsive to an average of the plurality delta values exceeding a first predetermined value; and'}], 'when the temperature value for the catalyst exceeds a predetermined temperature value and one or more first prerequisite conditions are met [{'sub': 'x', 'accessing a plurality of system-out NOmeasurement signals over a second predetermined period of time,'}, {'sub': 'x', 'calculating an average of the plurality of system-out NOmeasurement signals, and'}, {'sub': 3', 'x, 'setting the flag indicative of NHslip for the exhaust system responsive to the calculated ...

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Номер записи: 86
16-10-2014 дата публикации

Control apparatus of internal combustion engine

Номер: US20140305106A1
Автор: Hiroki NISHIJIMA, Tatsuhiro Hashida
Принадлежит: Toyota Motor Corp

An SCR system ( 8 ) is arranged in an exhaust path ( 4 ) of an internal combustion engine ( 2 ) to which the invention is applied, and a particulate filter ( 14 ) is arranged downstream thereof. A control apparatus ( 16 ) includes temperature controlling means for controlling a temperature of an element portion of the particulate sensor. The temperature controlling means performs control to increase the temperature of the element portion of the particulate sensor to a first temperature range (T 1 ), when a cumulative value (t) of a time for which the particulate sensor is used in a specific operating state reaches a reference time (t 1 ), after detection of a particulate amount by the particulate sensor has started this time. Here, the specific operating state is an operating state set taking into account an operating state in which urea related substances tend to be discharged to a downstream side of the SCR system ( 8 ). Also, the first temperature range (T 1 ) is a temperature that is higher than a temperature at which the urea related substances decompose, and lower than a temperature at which the particulates are burned off.

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Номер записи: 87
03-08-2017 дата публикации

EXHAUST TREATMENT SYSTEM AND METHOD FOR TREATMENT OF AN EXHAUST STREAM

Номер: US20170218812A1
Автор: BIRGERSSON Henrik, NILSSON MAGNUS
Принадлежит:

An exhaust treatment system comprising: a first oxidation catalyst to oxidize nitrogen- and/or hydrocarbon compounds in an exhaust stream; a first dosage device downstream of said first oxidation catalyst to supply a first additive into said exhaust stream; a first reduction catalyst device, arranged downstream of said first dosage device, including a slip-catalyst primarily for reduction of nitrogen oxides (NOx), and secondarily for oxidation of additive; a second oxidation catalyst arranged downstream of said first reduction catalyst; a particulate filter arranged downstream of said oxidation catalyst; a second dosage device, arranged downstream of said particulate filter to supply a second additive into said exhaust stream; and a second reduction catalyst device, arranged downstream of said second dosage device for reduction of nitrogen oxides in said exhaust stream, with the use of at least one of said first and said second additive. 1. An exhaust treatment system , arranged for treatment of an exhaust stream , which results from a combustion in a combustion engine , said system comprising:a first oxidation catalyst, arranged to oxidize compounds comprising one or several of nitrogen, carbon and hydrogen in said exhaust stream;a first dosage device, arranged downstream of said first oxidation catalyst, and arranged to supply a first additive into said exhaust stream;{'sub': x', 'x, 'a first reduction catalyst device, arranged downstream of said first dosage device, and arranged for reduction of nitrogen oxides NOin said exhaust stream, through the use of said first additive, wherein said first reduction catalyst device comprises at least one slip-catalyst (SC), which is arranged primarily for reduction of nitrogen oxides NO, and secondarily for oxidation of additive in said exhaust stream;'}a second oxidation catalyst, which is arranged downstream of said first reduction catalyst device, and is arranged to oxidize one or several of nitrogen oxide NO and ...

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Номер записи: 88
03-08-2017 дата публикации

EXHAUST TREATMENT SYSTEM AND METHOD FOR TREATMENT OF AN EXHAUST STREAM

Номер: US20170218813A1
Автор: BIRGERSSON Henrik, NILSSON MAGNUS
Принадлежит:

An exhaust treatment system comprising: a first dosage device to supply a first additive into an exhaust stream; a first reduction catalyst device downstream of said first dosage device, including a slip-catalyst primarily for reduction of nitrogen oxides (NOx) through the use of the additive, and secondarily for oxidation of additive; an oxidation catalyst downstream of said first reduction catalyst device; a particulate filter downstream of said oxidation catalyst; a second dosage device downstream of said particulate filter to supply a second additive into said exhaust stream; a second reduction catalyst device downstream of said second dosage device for a reduction of nitrogen oxides in said exhaust stream using at least one of said first and said second additive. 1. An exhaust treatment system arranged for treatment of an exhaust stream , which results from a combustion in a combustion engine , said system comprising:a first dosage device arranged to supply a first additive into said exhaust stream;{'sub': x', 'x, 'a first reduction catalyst device, arranged downstream of said first dosage device, and arranged for reduction of nitrogen oxides NOin said exhaust stream through the use of said first additive, wherein said first reduction catalyst device comprises at least on slip catalyst (SC), arranged primarily for reduction of nitrogen oxides NO, and secondarily for oxidation of additive in said exhaust stream;'}an oxidation catalyst, arranged downstream of said first reduction catalyst device, and arranged to oxidize one or several of nitrogen oxide NO and incompletely oxidized carbon compounds in said exhaust stream;a particulate filter, arranged downstream of said oxidation catalyst, and arranged to catch and oxidize soot particles;a second dosage device, arranged downstream of said particulate filter, and arranged to supply a second additive into said exhaust stream; and{'sub': 'x', 'a second reduction catalyst device, arranged downstream of said second ...

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Номер записи: 89
03-08-2017 дата публикации

METHOD FOR DETERMINING AN AMMONIA MASS FLOW

Номер: US20170218828A1
Автор: Schweizer Frank
Принадлежит:

A method for determining a mass flow of ammonia between two SCR catalytic converters disposed one after the other in an SCR catalytic converter system in an exhaust system, which comprises only one reduction agent dosing unit upstream of the first SCR catalytic converter, characterized in that the determination is carried out from the signal of a NOx sensor disposed between the two SCR catalytic converters and the signal of a NOx sensor disposed downstream of the second SCR catalytic converter. 132222320112122323323. A method for determining a mass flow of ammonia (dm(NH)_) between two SCR catalytic converters ( , ) disposed one after an other in an SCR catalytic converter system () in an exhaust system () , which includes only one reduction agent dosing unit () upstream of the first SCR catalytic converter () , the method comprising determining the mass flow from a signal of a NOx sensor () disposed between the two SCR catalytic converters and a signal of a NOx sensor () disposed downstream of the second SCR catalytic converter ().2323323. The method according to claim 1 , characterized in that a difference of the signals of the NOx sensor () disposed between the two SCR catalytic converters and the signal of the NOx sensor () disposed downstream of the second SCR catalytic converter () is formed for the determination.3202022203233322022. The method according to claim 1 , characterized in that a specific demand for a dosing agent (facDos_) of the SCR catalytic converter system () and a specific demand for a dosing agent (facDos_) of the first SCR catalytic converter (facDos_) are calculated from the signal of the NOx sensor () disposed between the two SCR-catalytic converters and the signal of the NOx sensor () disposed downstream of the second SCR catalytic converter claim 1 , and the mass flow of ammonia (dm(NH)_) is determined by comparing the integral against time of the two dosing agent demands (facDos_ claim 1 , facDos_).42020222021213122. The method ...

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Номер записи: 90
11-08-2016 дата публикации

DUAL PATH AFTERTREATMENT SYSTEM AND METHOD UTILIZING FUEL AS AN ON-BOARD REDUCTANT FOR NOx SCR

Номер: US20160230632A1
Автор: Baldwin-Squib Cody, Brocker Andrew, Dimaggio Craig L., Hamilton Travis T., Hardman Ken, Smith Michael A., Wuttke Jeffrey P.
Принадлежит:

A system and method for utilizing fuel as an on-board reductant for selective catalytic reduction of NOx is provided and includes a controller for controlling an engine to produce a lean first exhaust stream and a rich second exhaust stream that are received in respective first and second passageways of a dual path aftertreatment system. The rich second exhaust stream reacts with NOx stored in a NOx storage and reduction catalyst of the second passageway to regenerate this catalyst and generate ammonia. The first exhaust stream and the second exhaust stream having the generated ammonia are combined in a downstream common passageway to form a combined lean exhaust gas stream where the ammonia carried therein is stored or used by an SCR catalyst of the common passageway for NOx reduction. The engine is subsequently controlled to produce a rich first exhaust stream and a lean second exhaust stream. 1. A system for utilizing fuel as an on-board reductant for selective catalytic reduction , the system comprising:an engine including a first set of cylinders configured to produce a first exhaust gas stream and a second set of cylinders configured to produce a second exhaust stream separate from the first exhaust stream; a first exhaust gas passageway fluidly coupled to only the first set of cylinders so as to receive only the first exhaust stream, and a second exhaust gas passageway separate from the first exhaust gas passageway and fluidly coupled to only the second set of cylinders so as to receive only the second exhaust stream, the first and second exhaust gas passageways including respective first and second NOx storage and reduction catalysts;', 'a common exhaust gas passageway coupled to the first and second exhaust gas passageways at a junction downstream of the respective NOx storage reduction catalysts, the common exhaust gas passageway including an oxidation catalyst downstream of an SCR catalyst and configured to receive the first and second exhaust gas streams ...

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Номер записи: 91
25-07-2019 дата публикации

EXHAUST SYSTEM AND CONTROL METHOD OF AMOUNT OF UREA SUPPLY

Номер: US20190226377A1
Автор: Kim Chang Hwan, LEE Hyokyung
Принадлежит:

An exhaust system according to an exemplary embodiment of the present invention includes a nitrogen oxide storing catalytic collector connected to an exhaust line and collecting a nitrogen oxide included an exhaust gas in a first temperature or less; a first selective catalytic reducer disposed at a rear portion of the nitrogen oxide storing catalytic collector and reducing a nitrogen oxide included in the exhaust gas; and a first urea injector disposed at the front side of the nitrogen oxide storing catalytic collector and supplying a urea solution when a temperature of the nitrogen oxide exceeds the first temperature. 1. An exhaust system comprising:a nitrogen oxide storing catalytic collector connected to an exhaust line, the nitrogen oxide storing catalytic collector collecting a nitrogen oxide included an exhaust gas in a first temperature or less;a first selective catalytic reducer disposed at a rear portion of the nitrogen oxide storing catalytic collector, the first selective catalytic reducer reducing the nitrogen oxide included in the exhaust gas; anda first urea injector disposed at a front portion of the nitrogen oxide storing catalytic collector, the first urea injector supplying a urea solution when a temperature of the nitrogen oxide exceeds the first temperature.2. The exhaust system of claim 1 , further comprising:a second selective catalytic reducer disposed at a rear portion of the first selective catalytic reducer device, the second selective catalytic reducer reducing the nitrogen oxide included in the exhaust gas.3. The exhaust system of claim 2 , further comprising:a second urea injector disposed between the first selective catalytic reducer and the second selective catalytic reducer, the second urea injector supplying the urea solution to the exhaust line when the temperature of the nitrogen oxide exceeds a second temperature.4. The exhaust system of claim 3 , wherein:the first selective catalytic reducer includes a low temperature selective ...

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Номер записи: 92
24-08-2017 дата публикации

Abnormality diagnosis device for exhaust gas purification apparatus in internal combustion engine

Номер: US20170241315A1
Автор: Kenji Furui, Makoto Ogiso, Takeru Shirasawa, Toru Kidokoro
Принадлежит: Toyota Motor Corp

When an integrated value of a determination value correlated with a command value for an amount of supply of a reducing agent at the time of the command value being larger than a command supply amount threshold value reaches an integration threshold value, a determination is made that a diagnosis condition is satisfied, and an abnormality in the supply of the reducing agent is diagnosed based on an integrated value of the command value for the amount of supply of the reducing agent and an integrated value of an estimated value of the amount of supply of the reducing agent, whereas in cases where a period of time in which the diagnosis condition is not satisfied is longer than a time period threshold value, an interval of supply of the reducing agent is extended.

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Номер записи: 93
31-08-2017 дата публикации

CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE

Номер: US20170248058A1
Автор: Goto Isamu
Принадлежит: TOYOTA JIDOSHA KABUSHIKI KAISHA

A control apparatus for an internal combustion engine includes an electronic control unit. The electronic control unit is configured to: execute increasing a temperature of an exhaust gas control apparatus at a second temperature increase speed as a regeneration control when the temperature of the exhaust gas control apparatus is in a second temperature range; control the temperature of an exhaust gas control apparatus during an idle operation so as to be equal to or smaller than the temperature of the exhaust gas control apparatus when the internal combustion engine enters an idle operation state as a temperature increase suppression control when the temperature of the exhaust gas control apparatus during a regeneration control is in the second temperature range and the internal combustion engine is in the idle operation state. 1. A control apparatus for an internal combustion engine , the internal combustion engine including an exhaust gas control apparatus provided in an exhaust passageway of the internal combustion engine and a fuel supply apparatus configured to supply fuel to the exhaust gas control apparatus , the control apparatus comprising:an electronic control unit configured to:(a) control the supply of fuel by the fuel supply apparatus as a regeneration control such that a temperature of the exhaust gas control apparatus is increased and a particulate matter accumulated on the exhaust gas control apparatus is burned;(b) execute increasing the temperature of the exhaust gas control apparatus at a first temperature increase speed as the regeneration control when the temperature of the exhaust gas control apparatus is in a first temperature range;(c) execute increasing the temperature of the exhaust gas control apparatus at a second temperature increase speed as the regeneration control when the temperature of the exhaust gas control apparatus is in a second temperature range, the second temperature increase speed being slower than the first temperature ...

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Номер записи: 94
08-09-2016 дата публикации

METHOD OF EVALUATING A SOOT QUANTITY ACCUMULATED IN A SELECTIVE CATALYTIC REDUCTION WASHCOATED PARTICULATE FILTER (SDPF)

Номер: US20160258331A1
Автор: ACETO Alessandra, Bologna Giuseppe Mazzara, PELLEGRINO Stefano, Ricci Isadora
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

A method is disclosed for evaluating a soot quantity accumulated in a Selective Catalytic Reduction wash-coated particulate filter of an internal combustion engine. The internal combustion engine is equipped with an exhaust gas aftertreatment system including an urea injector. Using a map correlating a urea quantity value, a NOx quantity value, a temperature value and a mass flow value to a correction value of a soot quantity is used to correct an estimated value of the soot quantity in order to obtain an evaluated value of the soot quantity. 112-. (canceled)13. A method of evaluating a soot quantity accumulated in a Selective Catalytic Reduction wash-coated particulate filter of an internal combustion engine having an exhaust gas aftertreatment system including a urea injector , the method comprising:determining an urea quantity value to be injected by the urea injector;{'sub': 'x', 'determining a NOquantity value at an inlet of the selective catalytic reduction wash-coated particulate filter;'}determining a temperature value at the inlet of the selective catalytic reduction wash-coated particulate filter;determining a mass flow value of an exhaust gas in the aftertreatment system;{'sub': 'x', 'computing a correction value of a soot quantity using a map correlating the urea quantity value, the NOquantity value, the temperature value and the mass flow value; and'}correcting an estimated value of the soot quantity using the correction value in order to obtain an evaluated value of the soot quantity.14. The method according to claim 13 , wherein subdividing the map in a first sub-map correlating the urea quantity value and the NOquantity value to an intermediate value and a second sub-map correlating the intermediate value claim 13 , the temperature value and the mass flow value to the correction value.15. The method according to claim 13 , further comprising determining the estimated value on the basis of a pressure difference between the inlet and an outlet of the ...

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Номер записи: 95
08-08-2019 дата публикации

EXHAUST GAS TREATMENT DEVICE COMPRISING AN ELECTROCHEMICAL CELL

Номер: US20190242287A1
Автор: Birri Anthony, Caporali Roberto, EASTWOOD Peter
Принадлежит:

Methods and systems are provided for an exhaust gas treatment device. In one example, the exhaust gas treatment device comprises an electrochemical cell having a first electrode, a second electrode and an electrolyte provided between the first and second electrodes, wherein the electrochemical cell is configured to convert a first pollutant species, such as nitric oxide, within the exhaust gas to a second pollutant species, such as nitrogen dioxide, such that a concentration of the second pollutant species within the exhaust gases leaving the exhaust gas treatment device is increased relative to the exhaust gases entering the exhaust gas treatment device. 1. An exhaust system comprising:{'sub': '2', 'an exhaust passage comprising a first exhaust gas treatment device upstream of a first emission control device, further comprising a second exhaust gas treatment device downstream of the first emission control device and upstream of a second emission control device, where the first and second exhaust gas treatment devices are configured to increase a concentration of NO.'}2. The exhaust system of claim 1 , wherein the first exhaust gas treatment device is identical to the second exhaust gas treatment device claim 1 , and where each of the first and second exhaust gas treatment devices comprises an electrochemical cell comprising a cathode and an anode claim 1 , and where oxygen ions flow from the cathode to the anode.3. The exhaust system of claim 2 , wherein the anode is arranged in the exhaust passage and the cathode is arranged outside of the exhaust passage.4. The exhaust system of claim 2 , wherein the cathode and the anode are arranged in the exhaust passage claim 2 , and where the anode is upstream of the cathode relative to a direction of exhaust gas flow claim 2 , and where a wall is arranged between the cathode and the anode claim 2 , the wall shaped to direct exhaust gas to flow around and away from the cathode.5. The exhaust system of claim 2 , wherein the ...

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Номер записи: 96
15-09-2016 дата публикации

EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

Номер: US20160265411A1
Автор: Imai Daichi, Itoh Kazuhiro, Nishioka Hiromasa, NOTAKE Yasumasa, Otsuki Hiroshi, Tsukamoto Yoshihisa
Принадлежит: TOYOTA JIDOSHA KABUSHIKI KAISHA

Micropore zones ZMI are defined at upstream sides of partition walls of a particulate filter and macropore zones ZMA are defined at downstream sides of partition walls. The pore size of the partition walls at the micropore zones is set so that the particulate matter and the ash can be trapped by the partition walls at the micropore zones, while the pore size of the partition walls at the macropore zones is set so that the ash can pass through the partition walls at the macropore zones. When a quantity of trapped particulate matter is smaller than a limit quantity, control for increasing gas which temporarily increases the flow rate of the gas which flows into the particulate filter in order to remove the ash from the particulate filter, is performed. 1. An exhaust purification device for an internal combustion engine which arranges a particulate filter for trapping particulate matter which is contained in exhaust gas in an engine exhaust passage , where said particulate filter is provided with alternately arranged exhaust gas inflow passages and exhaust gas outflow passages and porous partition walls which separate these exhaust gas inflow passages and exhaust gas outflow passages from each other , micropore zones are defined at upstream sides of the partition walls , macropore zones are defined at downstream sides of the partition walls , a pore size of the partition walls in the micropore zones is set so that particulate matter and ash can be trapped by the partition walls at the micropore zones , and a pore size of the partition walls in the macropore zones is set so that ash can pass through the partition walls at the macropore zones , characterized in that when a quantity of trapped particulate matter on the particulate filter is smaller than a predetermined limit quantity , control for increasing gas which temporarily increases the flow rate of gas which flows into the particulate filter in order to remove the ash from the particulate filter , is performed.2. ...

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Номер записи: 97
15-08-2019 дата публикации

Abnormality diagnosis apparatus and vehicle

Номер: US20190249586A1
Автор: Hiromasa Nishioka, Keishi Takada, Tetsuya Sakuma
Принадлежит: Toyota Motor Corp

An abnormality diagnosis apparatus for an exhaust gas control apparatus. The abnormality diagnosis apparatus includes: an adsorption amount detector which detects an actual adsorption amount that is an amount of ammonia actually adsorbed in a catalyst; and an electronic control unit configured to: i) estimate an estimated adsorption amount that is an ammonia adsorption amount in the catalyst on an assumption that an ammonia supply apparatus is normal; and ii) execute an abnormality diagnosis in which the ammonia supply apparatus is diagnosed as being abnormal, in a case where the estimated adsorption amount is equal to or smaller than a predetermined adsorption amount and where a difference between the estimated adsorption amount and the actual adsorption amount is larger than a threshold.

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Номер записи: 98
13-09-2018 дата публикации

DIAGNOSIS APPARATUS AND DIAGNOSIS METHOD FOR NOx SENSOR

Номер: US20180258821A1
Автор: Hiroshi Miyamoto, Koji Hagiwara, Masahiko Masubuchi, Toru Kidokoro, Yasushi Iwazaki
Принадлежит: Toyota Motor Corp

An object is to prevent a wrong diagnosis from being made in diagnosis of an NOx sensor provided downstream of an SCR catalyst. A diagnosis apparatus is applied to an NOx sensor provided in an exhaust system including an SCR catalyst, a reducing agent supply device, an NOx sensor, an exhaust gas purification device provided upstream of the SCR catalyst, and a controller configured to raise the temperature of the exhaust gas purification device and control supply of reducing agent so as to adjust the ammonia adsorption amount to a specific amount. The controller is further configured to perform diagnosis of the NOx sensor on the basis of the concentration of ammonia slipping out of the SCR catalyst and disallow diagnosis of the NOx sensor since the ammonia adsorption amount is adjusted to the specific amount until a specific time elapses.

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Номер записи: 99
21-10-2021 дата публикации

Systems and methods for selective catalytic reduction and/or ammonia slip catalyst sulfur protection

Номер: US20210324775A1
Автор: Aleksey Yezerets, Di Wang, Jinyong LUO, Michael J. Cunningham, Richard J. ANCIMER, Yadan Tang, Yuhui ZHA
Принадлежит: Cummins Inc

Systems, apparatuses, and methods include predicting a sulfur exposure of one or more copper-zeolite catalysts deployed in an exhaust aftertreatment system; comparing the predicted sulfur exposure to a predefined sulfur exposure threshold; and responsive to the determination, heating the exhaust aftertreatment catalyst to a predefined heat treatment temperature for a predefined time period to desulfate the one or more copper-zeolite catalysts.

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Номер записи: 100