ДИСКРЕТНАЯ ГИДРАВЛИЧЕСКАЯ СИСТЕМА

Система, поворотное устройство, устройство вращения, способ и контроллер для управления системой предназначены для перемещения нагрузки из одного положения в другое. Система включает гидроусилитель, посредством которого генерируются суммарные усилия, действующие на нагрузку, по меньшей мере, одну рабочую камеру, работающую по принципу вытеснения и расположенную в указанном гидроусилителе, один контур подпитки высокого давления и один контур подпитки низкого давления, управляющий контур, посредством которого к одной из рабочих камер могут быть по очереди подключены по одному из вышеупомянутых контуров подпитки высокого и низкого давления, при этом управляющий контур содержит для каждой предопределенной камеры управляемые интерфейсы управления, посредством которых подключение к контуру подпитки высокого давления или низкого давления может быть открыто или закрыто, причем каждая рабочая камера способна генерировать силовые составляющие, которые соответствуют давлениям контуров подпитки, подключаемых ...

ГИДРАВЛИЧЕСКАЯ СИСТЕМА, ПРИВОДЯЩАЯ В ДВИЖЕНИЕ НЕФТЯНОЙ СКВАЖИННЫЙ НАСОС

FIELD: engines and pumps. SUBSTANCE: invention relates to oil production by means of bottom-hole oil pumps. The hydraulic system driving the oil bottom-hole pump comprises the bidirectional variable displacement piston pump, the outlet speed detection section, the outlet pressure detection section and the proportional solenoid operating valve. They are implemented in the form of integrated structure of the block in the same shell with the pump housing. The pump housing includes a connection section which is implemented on a side surface of a covering and which joins the outlet channel of the pump of the external pilot hydraulic contour and the second pilot channel which supplies external pilot pressure from the connection section to the pilot channel between the outlet channel of the piston pump and the proportional solenoid operating valve. Also it contains a device which mechanically shuts supply of external pilot pressure when outlet pressure of the piston pump is below the pre-set pressure. As a result, the hydraulic system driving the oil bottom-hole pump is capable to exclude cavitation, even when the control system stops. EFFECT: providing the simple design which does not depend from electric controls and causes no cost increase. 3 cl, 8 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 563 425 C1 (51) МПК F04B 47/02 (2006.01) F04B 49/10 (2006.01) F04B 1/26 (2006.01) F15B 15/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2014109449/06, 14.03.2013 (24) Дата начала отсчета срока действия патента: 14.03.2013 (72) Автор(ы): ХИРАИДЕ Хирокадзу (JP), ХАЯСИ Акихиро (JP) (73) Патентообладатель(и): ЮКЕН КОГИО КО., ЛТД. (JP) R U Приоритет(ы): (22) Дата подачи заявки: 14.03.2013 (45) Опубликовано: 20.09.2015 Бюл. № 26 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 12.03.2014 (86) Заявка PCT: 2 5 6 3 4 2 5 R U Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, строение 3, ООО " ...

ДИСКРЕТНАЯ ГИДРАВЛИЧЕСКАЯ СИСТЕМА

... 1. Система со средой, находящейся под давлением, содержащая: ! - по меньшей мере один гидроусилитель (23) или гидроусилительный блок, посредством которого могут быть созданы суммарные усилия (Fcyl), действующие на нагрузку; ! - по меньшей мере две рабочие камеры, работающие по принципу расширения и размещенные в гидроусилителе или гидроусилительном блоке, ! отличающаяся тем, что она дополнительно содержит: ! - по меньшей мере один контур подпитки высокого давления (HPi, HPia), являющийся источником гидравлической мощности, который может как вырабатывать, так и принимать объемный расход при заданном уровне давления; ! - по меньшей мере один контур подпитки низкого давления (LPi, LPia), являющийся источником гидравлической мощности, который может как вырабатывать, так и принимать объемный расход при заданном уровне давления; ! - по меньшей мере две предопределенные рабочие камеры (19, 20, 21, 22), которые относятся к вышеуказанным камерам; ! - управляющий контур (40), посредством которого ...

PLUG WITH A HYDRAULIC CYLINDER AND PROCEDURE FOR SETTING AND RELEASING A PLUG

Hydraulic drive unit and operating method

Hydraulische Antriebseinheit für eine Formgebungsmaschine mit - einer von einem Motor (3) angetriebenen Pumpe (4), - einer Regel- oder Steuereinheit (5) zur Regelung und/oder Steuerung der Antriebseinheit (1) auf einen Sollbetriebspunkt der Antriebseinheit (1) sowie - einem mit der Regel- oder Steuereinheit (5) verbundenen Speicher (6), wobei im Speicher (6) ein Zusammenhang zwischen einer für einen durch die Antriebseinheit (1) direkt oder indirekt verursachten Schall charakteristischen Größe und einem verschiedene Betriebspunkte der Antriebseinheit (1) repräsentierenden Datensatz hinterlegt ist und dass die Regel- oder Steuereinheit (5) dazu ausgebildet ist, auf Basis des Zusammenhangs den Sollbetriebspunkt auszuwählen.

DIGITAL HYDRAULIC SYSTEM

A method and a pressurized medium system, comprising: at least one actuator (23) or actuator unit, by means of which it is possible to generate sum forces (Fcyl) effective on said load; at least one working chamber (19, 20, 21, 22) operating by the principle of displacement and located in said actuator or actuator units; at least one charging circuit (HPi, HPia) of a higher pressure, which is a source of hydraulic power; at least one charging circuit (LPi, LPia) of a lower pressure, which is a source of hydraulic power; a control circuit (40), by means of which at least one said charging circuits of higher pressure (HPi, HPia) and at least one of said charging circuits of lower pressure (LPi, LPia) can be coupled, in turn, to at least one of said working chambers (19, 20, 21, 22); wherein each of said working chambers (10, 20, 21, 22) is capable of generating force components (FA, FB, FC, FD) that correspond to the pressures of the charging circuits (HPi, HPia, LPi, LPia) to be coupled ...

HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE

A hydraulic system provided with a relief valve for a construction machine is disclosed, which can reduce a discharge flow rate of a hydraulic pump when a relief valve is operated. The hydraulic system includes an attachment actuator connected to the hydraulic pump to be driven by an operation of the attachment operation device, a control valve installed in a flow path between the hydraulic pump and the attachment actuator, an orifice installed in a flow path branched from a discharge flow path of the hydraulic pump, a relief valve installed on a downstream side of the orifice in the flow path, and a controller outputting a control signal to a flow control valve of the hydraulic pump so as to reduce a discharge flow rate of the hydraulic pump when a difference between pressures before and after the orifice exceeds a predetermined pressure value of the relief valve.

Hydraulic pressure regulator for driving an adjustable hydraulic displacement unit.

Die vorliegende Erfindung betrifft einen hydraulischen Druckregler (20) zur Ansteuerung einer verstellbaren hydraulischen Verdrängereinheit, bestehend aus einer Vor- und Hauptstufe (20a, 20b), wobei die mittels mechanischem oder elektrischem Primäraktor ansteuerbare Vorstufe zwei Anschlüsse (22, 23) aufweist, deren fluidsche Verbindung mittels eines Pilotkolbens (21) der Vorstufe (20a) steuerbar ist, wobei der Pilotkolben (21) von einer Stufenbuchse (30) umgeben ist und die Einbauorientierung der aus dem Pilotkolben (21) und Stufenbuchse (30) gebildeten Bauteilkombination derart änderbar ist, so dass der Druckregler wahlweise mit einer steigenden oder fallenden Kennlinie betreibbar ist.

HYDRAULIC SYSTEM ELECTRONICALLY-CONTROLLABLE PRESSURE AND FLOW

작업 기계의 유압 제어 장치

... 블리드 오프 제어에 의한 유압 펌프의 토출 유량의 스로틀 오프의 손실을 저감시켜, 에너지 효율을 향상시킴과 함께, 유압 펌프의 토출 압력을 조작 레버 장치의 조작량에 따라 제어 가능하게 하고, 조작 성능도 향상시킨다. 컨트롤러(6)는 조작량 검출기(20A, 20B)로부터의 조작량 신호에 기초하여, 조작량 신호가 증가하는 것에 따라서 증가하는 목표 펌프 토출 압력을 산출하는 목표 펌프 압력 설정부(32)와, 조작량 신호에 기초하여, 조작량 신호가 증가하는 것에 따라서 증가하는 펌프 유량 상한값을 산출하는 펌프 유량 상한 설정부(33)를 갖고, 목표 펌프 압력 설정부(32)에서 산출한 목표 펌프 토출 압력과, 펌프 유량 상한 설정부(33)에서 산출한 펌프 유량 상한값과, 압력 검출기(21)에서 검출한 유압 펌프(2)의 토출 압력에 기초하여 유압 펌프(2)의 틸팅량이 제어된다.

Hydraulic control device for working machine

A hydraulic control device for a working machine includes hydraulic actuators, a hydraulic pump which functions as a hydraulic power source, control valves which control the actuators on the basis of operations by an operating unit, a common bleed-off valve which returns excess oil to a tank via an unload passage on the basis of the operations by the operating unit, and a control unit which controls the common bleed-off valve. The common bleed-off valve is capable of setting a position for closing the unload passage when the common bleed-off valve is in a non-operating state. The control valves have center bypass passages which function as individual bleed-off passages which open when the control valves are in neutral states. Opening characteristics of the control valves are set such that the center bypass passages are closed in initial stroke periods in which the control valves move toward operating positions.

Valve for valve assembly

A valve (18), for a valve assembly (10) for regulating the pressure of a fluid guided in a hydraulic system for supplying pressure to at least one hydraulic consumer (12a, 12b), includes a pilot control stage (48) and a main control stage (38) for at least partially clearing or blocking a fluid path from a supply connection (P) to an outflow connection (T). A relief stage (54) for pressure relief of a fluid chamber is arranged between the pilot control stage (48) and the main control stage (38). The relief stage (54) compares the existing load pressure at load terminal (LS) dedicated to the hydraulic consumer (12a, 12b) with the outflow pressure at the outflow connection (T), clearing the pressure relief if both pressures are approximately the same. The relief stage (54) can be directly connected to the load connection (LS) and can be charged with load pressure.

Pressurized fluid actuated positioning device, in particular for vehicle steering apparatus

Eine druckmittelbetätigte Stelleinrichtung, insbesondere für eine Fahrzeuglenkvorrichtung, umfasst einen doppeltwirkenden Aktuator (12) mit zwei im Wesentlichen entgegengesetzt wirkenden Wirkbereichen (24, 26), wobei an jeden Wirkbereich (24, 26) je eine Druckmittelleitungsstrecke (28, 30) angeschlossen ist, durch welche den Wirkbereichen (24, 26) ein Druckmittel zuführbar beziehungsweise aus diesen (24, 26) abführbar ist, und wobei jede dem Aktuator (12) Druckmittel zuführende Druckmittelleitungsstrecke (28, 30) mit einer Druckmittelpumpe (14) verbunden ist, welche mit einem Pumpenantrieb (16) gekoppelt ist, durch den die wenigstens eine Druckmittelpumpe (14) zur Förderung von Druckmittel antreibbar ist. Erfindungsgemäß ist der Pumpenantrieb (16) derart ausgebildet, dass die Menge des von der Druckmittelpumpe (14) pro Zeiteinheit geförderten Druckmittels veränderbar und seine Förderrichtung (I, II) umkehrbar ist.

HYDRAULIC CIRCUIT FOR A SWING SYSTEM IN A MACHINE

СПОСОБ И СИСТЕМА СО СРЕДОЙ, НАХОДЯЩЕЙСЯ ПОД ДАВЛЕНИЕМ С КОНТРОЛЛЕРОМ

FIELD: machine building. SUBSTANCE: method and system with a medium under pressure comprising: at least one hydraulic actuator (23) or a hydraulic actuating unit, by means of which total forces (Fcyl) acting on the said load are generated; at least one working chamber (19, 20, 21, 22) operating as per the principle of displacing and located inside the said hydraulic actuator or hydraulic actuating unit; at least one high-pressure charge circuit (HPi, HPia), which is the source of hydraulic power; at least one low-pressure charge circuit (LPi, LPia), which is the source of hydraulic power; control circuit (40), through which at least one of the aforementioned high (HPi, HPia) and low (LPi, LPia) pressure charge circuits can be connected in turn to at least one of working chambers (19, 20, 21, 22); herewith each working chamber (19, 20, 21, 22) is able to generate force components (FA, FB, FC, FD), which correspond to the pressures of charge circuits (HPi, HPia, LPi, LPia) connected to a specified working chamber, and each force component generates at least one of the aforementioned total forces separately or together with the force components produced by the other working chambers of the specified hydraulic actuator or hydraulic actuating unit. Control circuit of the system uses a controller. EFFECT: reduction of energy losses. 25 cl, 18 dwg, 3 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 647 932 C2 (51) МПК F15B 1/02 (2006.01) F15B 11/036 (2006.01) F15B 21/14 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК F15B 1/024 (2017.08); F15B 11/036 (2017.08); F15B 21/14 (2017.08) (21)(22) Заявка: 2013156857, 02.04.2009 (24) Дата начала отсчета срока действия патента: Дата регистрации: 21.03.2018 (73) Патентообладатель(и): НОРРХИДРО ОЙ (FI) 10.10.2008 FI 20085958 Номер и дата приоритета первоначальной заявки, из которой данная заявка выделена: 2011118361 10.10.2008 (56) Список документов, цитированных в отчете о ...

ЛЕТАТЕЛЬНЫЙ АППАРАТ

Изобретение относится к области авиации, в частности к конструкциям гидравлических систем летательных аппаратов. Летательный аппарат (1) имеет систему (4, 5) управления пространственным положением в полете, в свою очередь имеющую, по меньшей мере, один исполнительный механизм (6, 7) и гидравлический контур, соединенный с исполнительным механизмом (6, 7). Гидравлический контур содержит, по меньшей мере, один насос (8), выполненный с возможностью выдавать первый расход, когда давление гидравлического контура выше предварительно задаваемого порогового значения. Насос (8) выполнен с возможностью выдавать второй расход, больший, чем первый расход, причем летательный аппарат (1) имеет датчик (11а, 11b, 12, 13) для обнаружения величины, связанной с давлением гидравлического контура, и программируемый центральный блок (10) управления, который управляет насосом (8), чтобы выдавать второй расход, когда величина, обнаруживаемая датчиком (11а, 11b, 12, 13), соответствует давлению гидравлического контура ...

Patent RU2018120596A3

ВИ“? 2018120596” АЗ Дата публикации: 19.02.2020 Форма № 18 ИЗ,ПМ-2011 Федеральная служба по интеллектуальной собственности Федеральное государственное бюджетное учреждение ж 5 «Федеральный институт промышленной собственности» (ФИПС) ОТЧЕТ О ПОИСКЕ 1. . ИДЕНТИФИКАЦИЯ ЗАЯВКИ Регистрационный номер Дата подачи 2018120596/06(032466) 03.11.2016 РСТ/ЕР2016/076543 03.11.2016 Приоритет установлен по дате: [ ] подачи заявки [ ] поступления дополнительных материалов от к ранее поданной заявке № [ ] приоритета по первоначальной заявке № из которой данная заявка выделена [ ] подачи первоначальной заявки № из которой данная заявка выделена [ ] подачи ранее поданной заявки № [Х] подачи первой(ых) заявки(ок) в государстве-участнике Парижской конвенции (31) Номер первой(ых) заявки(ок) (32) Дата подачи первой(ых) заявки(ок) (33) Код страны 1. 10 2015 119 108.3 06.11.2015 РЕ Название изобретения (полезной модели): [Х] - как заявлено; [ ] - уточненное (см. Примечания) СПОСОБ И УСТРОЙСТВО ДЛЯ УПРАВЛЕНИЯ ГИДРАВЛИЧЕСКИ АКТИВИРУЕМЫМ ПРИВОДНЫМ УЗЛОМ АРМАТУРЫ Заявитель: ПЛЯИГЕР МАШИНЕНБАУ ГМБХ УНД КО. КГ, ОЕ 2. ЕДИНСТВО ИЗОБРЕТЕНИЯ [Х] соблюдено [ ] не соблюдено. Пояснения: см. Примечания 3. ФОРМУЛА ИЗОБРЕТЕНИЯ: [Х] приняты во внимание все пункты (см. п см. Примечания [ ] приняты во внимание следующие пункты: р [ ] принята во внимание измененная формула изобретения (см. Примечания) 4. КЛАССИФИКАЦИЯ ОБЪЕКТА ИЗОБРЕТЕНИЯ (ПОЛЕЗНОЙ МОДЕЛИ) (Указываются индексы МПК и индикатор текущей версии) Е15В 11/042 (2006.01) 5. ОБЛАСТЬ ПОИСКА 5.1 Проверенный минимум документации РСТ (указывается индексами МПК) Е15В 11/042 5.2 Другая проверенная документация в той мере, в какой она включена в поисковые подборки: 5.3 Электронные базы данных, использованные при поиске (название базы, и если, возможно, поисковые термины): Езрасепе, Рабеагсв 6. ДОКУМЕНТЫ, ОТНОСЯЩИЕСЯ К ПРЕДМЕТУ ПОИСКА Кате- Наименование документа с указанием (где необходимо) частей, Относится к гория* относящихся к предмету поиска пункту ...

СПОСОБ И УСТРОЙСТВО ДЛЯ УПРАВЛЕНИЯ ГИДРАВЛИЧЕСКИ АКТИВИРУЕМЫМ ПРИВОДНЫМ УЗЛОМ АРМАТУРЫ

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2018 120 596 A (51) МПК F15B 11/042 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2018120596, 03.11.2016 (71) Заявитель(и): ПЛЯЙГЕР МАШИНЕНБАУ ГМБХ УНД КО. КГ (DE) Приоритет(ы): (30) Конвенционный приоритет: 06.11.2015 DE 10 2015 119 108.3 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 06.06.2018 R U (43) Дата публикации заявки: 09.12.2019 Бюл. № 34 (72) Автор(ы): ЛИЧКО Бьерн (DE) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2017/076965 (11.05.2017) A Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, стр. 3, ООО "Юридическая фирма Городисский и Партнеры" R U (57) Формула изобретения 1. Способ управления гидравлически активируемым приводным узлом (1-3), в частности для арматуры, в котором по меньшей мере на части пути перестановки приводного узла определяют скорость (v') перестановки и сравнивается с заданной скоростью (v) перестановки, после чего в случае разности между фактическим значением (v') и заданным значением (v) скорости управление приводным узлом (1-3) изменяют таким образом, что скорость (v') перестановки приводного узла приводится к заданному значению (v). 2. Способ по п.1, в котором скорость (v') перестановки определяют путем комбинирования измерения пути и регистрации времени пути перестановки по меньшей мере в двух точках измерения. 3. Способ по п.1 или 2, в котором скорость (v') перестановки приводного узла (1-3) измеряют на отдельном участке (S1-S3) пути и используют в качестве основы для расчета времени для перестановки на остальном пути перестановки. 4. Способ по п.3, в котором скорость (v') перестановки приводного узла (1-3) измеряют в начале пути перестановки, исходя из конечного положения (S1) на отдельном участке (S1-S3) пути. 5. Способ по п.1, в котором скорость (v') перестановки приводного узла определяют непрерывно и сравнивают с заданной скоростью (v), после чего при возникновении Стр.: 1 A 2 0 1 8 1 2 0 5 9 6 (54 ...

Hydraulic drive system of construction machine

Hydraulic system with open loop electrohydraulic pressure compensation

Systems and methods for selective enablement of hydraulic operation

A hydraulic system 100 is provided. The hydraulic system 100 includes: a pump 102; a load sense conduit 141; a tank conduit 143; a function workport 178; and a function control valve 118. The hydraulic system 100 further includes a function poppet valve 122 arranged between the function workport 178 and the function control valve 118 and having a function poppet vent passage164, and a system control valve 120 arranged downstream of the function control valve 118. The system control valve 120 is biased into a first position where fluid communication between the function poppet vent passage 164 and the tank conduit 143 is prevented and fluid communication between the load sense conduit 141 and the tank conduit 143 is provided. The system control valve 120 is selectively movable to a second position where fluid communication between the function poppet vent passage 164 and the tank conduit 143 is allowed and fluid communication between the load sense conduit 141 and the tank conduit 143 is ...

HYDRAULIC CONTROL SYSTEM OF A MACHINE

HYDRAULIC ABSORPTION DEVICE AND MONITORING SYSTEM

Regelung drehzahlvariabler Verstellpumpen mittels modellbasierter Optimierung

Die Erfindung betrifft ein Verfahren zur Regelung einer Druckmittelzufuhr für mindestenseinen hydraulischen Aktor (110), der von einer drehzahlvariablen Verstellpumpe, bei der einin einem Verdrängervolumen je Arbeitsspiel verstellbares Förderwerk (122) von einem drehzahlvariablenAntrieb (121) angetrieben wird, mit einer Druckmittelmenge versorgt wird, dieurch ein vorgegebenes Druck- und/oder Volumenstrom-Profil bestimmt ist, wobei ein Drehzahlsoliwert(nson) und ein Sollwert (ason) für die das Verdrängervolumen je Arbeitsspiel bestimmendeKenngröße für einen Verfahrensablauf vorgegeben werden, indem ein modellbasiertesOptimierungsproblem, das durch eine Zielfunktion für den Verfahrensablauf vorgegebenwird, gelöst wird.

Variable speed control adjustment pump means model-based optimization

Die Erfindung betrifft ein Verfahren und ein Steuergerät (140) zur Regelung einer Druckmittelzufuhr für mindestens einen hydraulischen Aktor (110), der von einer drehzahlvariablen Verstellpumpe (120), bei der ein in einem Verdrängervolumen je Arbeitsspiel verstellbares Förderwerk (122) von einem drehzahlvariablen Antrieb (121) angetrieben wird, mit einer Druckmittelmenge versorgt wird, die durch ein vorgegebenes Druck- und/oder Volumenstrom-Profil bestimmt ist, wobei als bestimmende Kenngröße für einen Verfahrensablauf ein Drehzahlsollwert (ns011) und ein Sollwert (aSoll) für das Verdrängervolumen je Arbeitsspiel vorgegeben werden, indem ein modellbasiertes Optimierungsproblem, das durch eine Zielfunktion für den Verfahrensablauf vorgegeben wird, gelöst wird, dadurch gekennzeichnet, dass in der Zielfunktion dynamische Verluste, die von einer Veränderung des Drehzahlsollwerts (nSoll) oder des Sollwerts (aSoll) für das Verdrängervolumen je Arbeitsspiel verursacht werden, berücksichtigt werden ...

BY A UNDER PRESSURE STANDING UNKOMPRIMIERBARE LIQUID OPERATED SCHLAGVORRICHTUNG

HYDRAULIC PLANT

DEVICE FOR THE OPTIMIZATION OF HYDRAULICALLY CONTROLLED ENGAGEMENT OF CLUTCHES USED IN MARINE TRANSMISSIONS

HYDRAULIC SYSTEM AND METHOD OF CONTROLLING HYDRAULIC ACTUATOR

The invention relates to a hydraulic system, a mobile mining machine and to a method of controlling a hydraulic actuator. The hydraulic system comprises two hydraulic pumps (P1, P2) for generating hydraulic power for a hydraulic actuator (HA). The pumps are powered by means of a common electric motor (M). Operation of the actuator is controlled by controlling speed and direction of the motor, whereby hydraulic lines (19a, 19b) may be without actively controlled control valves.

DIGITAL HYDRAULIC SYSTEM

METHOD FOR CONTROLLING FLOW RATE OF ATTACHMENT FOR CONSTRUCTION EQUIPMENT

In the method for controlling a flow rate of an attachment for construction equipment according to the present invention, a control device is connected to an engine and a pump and an attachment is connected to the pump for carrying out particular operations, wherein the control device is input with various control information according to the equipment characteristics, user setting information from an instrument panel, engine rpm control information via an engine control dial, or the like. The method for controlling the flow rate of the attachment for construction equipment includes the steps of: selecting an attachment to operate in the instrument panel and an optimum operational rpm according to the attachment; controlling a flow rate by controlling a swash plate angle of the pump; and additionally controlling a supply flow rate of the attachment by resetting the engine rpm if flow rate control is necessary in the process of operating the attachment.

Work vehicle

A work vehicle includes: an operation tool that is operated by an operator; and a controller that determines a target flow rate for hydraulic oil fed to a hydraulic device on a basis of the amount of operation of the operation tool. The controller calculates a bleed-off target flow rate on a basis of the flow rate of hydraulic oil fed from a hydraulic oil pump and the target flow rate for hydraulic oil fed to the hydraulic device, calculates a bleed-off throttle differential pressure on a basis of a pressure of hydraulic oil fed from the hydraulic oil pump and a pressure of hydraulic oil in a hydraulic oil tank, calculates a bleed-off target opening area on a basis of the bleed-off target flow rate and the bleed-off throttle differential pressure, and controls a hydraulic oil control valve such that the bleed-off target opening area is achieved.

СПОСОБ И СИСТЕМА СО СРЕДОЙ, НАХОДЯЩЕЙСЯ ПОД ДАВЛЕНИЕМ С КОНТРОЛЛЕРОМ

... 1. Система со средой, находящейся под давлением, содержащая: по меньшей мере один гидроусилитель (23) или гидроусилительный блок, посредством которого могут быть созданы суммарные усилия (Гсу1), действующие на нагрузку;- по меньшей мере две рабочие камеры, работающие по принципу расширения и размещенные в гидроусилителе или гидроусилительном блоке,отличающаяся тем, что она дополнительно содержит:- по меньшей мере один контур подпитки высокого давления (НР, НР1), являющийся источником гидравлической мощности, который может как вырабатывать, так и принимать объемный расход при заданном уровне давления;- по меньшей мере один контур подпитки низкого давления (LР, LР1), являющийся источником гидравлической мощности, который может как вырабатывать, так и принимать объемный расход при заданном уровне давления;- по меньшей мере две предопределенные рабочие камеры (19, 20, 21, 22), которые относятся к вышеуказанным камерам;- управляющий контур (40), посредством которого к каждой из предопределенных ...

Hydraulic system used in construction vehicle e.g. hydraulic excavator, has control device to hydraulically control inlet pressure of conveying device, and inlet pressure resting against loads to control moving direction of loads

The system (1) has a conveying device downstream setting unit (22) to adjust moving direction of loads (23,33,43). A control device is provided to control the volume of fluid conveyed by a conveying device (20), and moving direction of loads adjusted by setting unit. The inlet pressure of conveying device, and inlet pressure resting against the loads are hydraulically controlled to control moving direction of loads.

Device for controlling actuator, particularly actuator of active chassis control, has hydraulic control unit comprises pressure regulating device, which is connected with pressure controlled unit for setting pump flow of pump

The device has a hydraulic control unit (22), which is connected with the actuator (12,14) and a variable positive-displacement pump (20), for the supply of a hydraulic power, which is driven by the combustion engine of the vehicle. The hydraulic control unit has a pressure regulating device (28), which is connected with a pressure controlled unit for setting the pump flow of the variable positive-displacement pump.

Hydrostatisches Antriebssystem

Die Erfindung betrifft ein hydrostatisches Antriebssystem (1) mit einer im Fördervolumen verstellbaren Pumpe (2), die zur Versorgung mindestens eines Verbrauchers (6) vorgesehen ist, wobei eine Fördervolumenstelleinrichtung (10) der Pumpe (2) mittels eines Vorgabesignals in Richtung einer Erhöhung des Fördervolumens beaufschlagt ist und in Abhängigkeit von einem den überschüssig geförderten Volumenstrom der Pumpe (2) erfassenden, hydraulischen Rückstellsignal in Richtung einer Verringerung des Fördervolumens beaufschlagt ist, wobei zur Erzeugung des Rückstellsignals eine Umlaufdruckwaage (20) vorgesehen ist, die in einem eine Förderleitung (5) der Pumpe (3) mit einem Behälter (4) verbindenden Strömungspfad angeordnet ist und in einer Rückstellsignalerzeugungsstellung (20b) das hydraulische Rückstellsignal erzeugt. Die Aufgabe, ein derartiges hydrostatisches Antriebssystem zur Verfügung zu stellen, das bei geringem Bauaufwand einen Abbau eines Leistungsvolumenstroms der Pumpe zu dem Behälter ...

Ventil-Anordnung für ein Druckölsystem

Ventil-Anordnung für ein einen Filter aufweisendes Druckölsystem für ein Getriebe und mit einem Überdruckventil (20) und einem Öldruckregelventil (22) zur Steuerung der Arbeitsdrücke des von einer Pumpe gelieferten Ölstromes, die in einem gemeinsamen Ventilgehäuse (24) angeordnet sind; vgl. Fig. 1.

Hydraulic drive unit and operating method

Hydraulische Antriebseinheit für eine Formgebungsmaschine mit - einer von einem Motor (3) angetriebenen Pumpe (4), - einer Regel- oder Steuereinheit (5) zur Regelung und/oder Steuerung der Antriebseinheit (1) auf einen Sollbetriebspunkt der Antriebseinheit (1) sowie - einem mit der Regel- oder Steuereinheit (5) verbundenen Speicher (6), wobei im Speicher (6) ein Zusammenhang zwischen einer für einen durch die Antriebseinheit (1) direkt oder indirekt verursachten Schall charakteristischen Größe und einem verschiedene Betriebspunkte der Antriebseinheit (1) repräsentierenden Datensatz hinterlegt ist und dass die Regel- oder Steuereinheit (5) dazu ausgebildet ist, auf Basis des Zusammenhangs den Sollbetriebspunkt auszuwählen.

AIRCRAFT

Regelung drehzahlvariabler Verstellpumpen mittels modellbasierter Optimierung

Die Erfindung betrifft ein Verfahren zur Regelung einer Druckmittelzufuhr für mindestens einen hydraulischen Aktor (11 0), der von einer drehzahlvariablen Verstellpumpe, bei der ein in einem Verdrängervolumen je Arbeitsspiel verstellbares Förderwerk (122) von einem drehzahlvariablen Antrieb (121) angetrieben wird, mit einer Druckmittelmenge versorgt wird, die durch ein vorgegebenes Druck- und/oder Volumenstrom-Profil bestimmt ist, wobei ein Drehzahlsoliwert (nson) und ein Sollwert (ason) für die das Verdrängervolumen je Arbeitsspiel bestimmende Kenngröße für einen Verfahrensablauf vorgegeben werden, indem ein modellbasiertes Optimierungsproblem, das durch eine Zielfunktion für den Verfahrensablauf vorgegeben wird, gelöst wird ...

LIFT DEVICE WITH VARIABLE SPEED ACTUATION

A lift device of the type appended to a vehicle such as a tailgate lift or wheelchair lift. The lift includes a platform (12) movable between a lower o r ground position (G) , an upper or load position (E) and a stowed position (S ). The platform (12) assumes a horizontal orientation in the ground (G) and loa d (E) positions and is pivotable to a vertical orientation when stowed for vehicle movement. The platform (12) is connected to a lever arm assembly(13) and further includes hydraulic apparatus (14) to move the platform (12) between ground (G), load (E) and stowed (S) positions. The hydraulic apparat us (14) is actuated by a pump and motor assembly (36) which includes an electri c motor (42) for actuation of the pump (4O) and hydraulic apparatus (14). By varying the speed of the motor (42), the speed of the platform (12) between various platform orientations can be varied.

METHOD AND DEVICE FOR CONTROLLING A HYDRAULICALLY ACTUATED DRIVE UNIT OF A VALVE

The invention relates to a method for controlling a hydraulically actuated drive unit (1-3) in particular for a valve, wherein the adjustment velocity (v1) is determined at least over part of the adjustment travel of the drive unit and is compared with a specified target adjustment velocity (v), whereupon, in the case of a difference between the actual value (v1) and the target value (v) of the velocity, the control of the drive unit (1-3) is changed in such a way that the adjustment velocity (v') of the drive unit is adjusted to the target value (v).

FLUID BYPASS SYSTEM

A method for actuating a bypass control valve assembly of a fluid system includes receiving a first input signal at an electronic control unit. The first input signal is related to an active position of a direction control valve that is in fluid communication with a fluid pump and a fluid actuation device. The directional control valve includes a neutral position that provides fluid communication between a fluid inlet port of the directional control valve and a fluid outlet port of the directional control valve. A second input signal is received at the electronic control unit. The second input signal is related to the rotational speed of the fluid pump. The second input signal is compared to a limit. A drain valve of a bypass valve assembly is actuated so that fluid communication between the fluid pump and a fluid reservoir through the bypass valve assembly is blocked.

DIGITAL HYDRAULIC SYSTEM

A method and a pressurized medium system, comprising: at least one actuator (23) or actuator unit, by means of which it is possible to generate sum forces (Fcyl) effective on said load; at least one working chamber (19, 20, 21, 22) operating by the principle of displacement and located in said actuator or actuator units; at least one charging circuit (HPi, HPia) of a higher pressure, which is a source of hydraulic power; at least one charging circuit (LPi, LPia) of a lower pressure, which is a source of hydraulic power; a control circuit (40), by means of which at least one said charging circuits of higher pressure (HPi, HPia) and at least one of said charging circuits of lower pressure (LPi, LPia) can be coupled, in turn, to at least one of said working chambers (19, 20, 21, 22); wherein each of said working chambers (10, 20, 21, 22) is capable of generating force components (FA, FB, FC, FD) that correspond to the pressures of the charging circuits (HPi, HPia, LPi, LPia) to be coupled ...

WORKING VEHICLE

작업 기계의 유압 제어 장치

... 블리드 오프 제어에 의한 유압 펌프의 토출 유량의 스로틀 오프의 손실을 저감시켜, 에너지 효율을 향상시킴과 함께, 유압 펌프의 토출 압력을 조작 레버 장치의 조작량에 따라 제어 가능하게 하고, 조작 성능도 향상시킨다. 컨트롤러(6)는 조작량 검출기(20A, 20B)로부터의 조작량 신호에 기초하여, 조작량 신호가 증가하는 것에 따라서 증가하는 목표 펌프 토출 압력을 산출하는 목표 펌프 압력 설정부(32)와, 조작량 신호에 기초하여, 조작량 신호가 증가하는 것에 따라서 증가하는 펌프 유량 상한값을 산출하는 펌프 유량 상한 설정부(33)를 갖고, 목표 펌프 압력 설정부(32)에서 산출한 목표 펌프 토출 압력과, 펌프 유량 상한 설정부(33)에서 산출한 펌프 유량 상한값과, 압력 검출기(21)에서 검출한 유압 펌프(2)의 토출 압력에 기초하여 유압 펌프(2)의 틸팅량이 제어된다.

CONTROL DEVICE FOR A HYDRAULIC DRIVE

The invention relates to a control device (1) for a working fluid for operating a hydraulic drive (11) such as is used, in particular, for a lift. Said control device (1) comprises a flow path (6) for directing a volume flow of the working fluid in a first and a second direction, and a first and a second control valve (21, 22) for controlling the volume flow, a flow-measuring means (610) for measuring the volume flow, a pilot control means (3) with a first and a second pilot control valve (31, 32), and an electric actuating means (4) for interacting with a comparison means (52) for comparing the measured volume flow with a volume flow setpoint value which can be predefined by a setpoint value-setting means (51), and a regulator (53) for generating an actuating signal for activating the first and second pilot control valves (31, 32) via a coupling means (33) which can move to and fro between a first and a second position and has the purpose of controlling the volume flow of the working fluid ...

HYDROSTATIC SYSTEM, EQUIPPED WITH A HYDRAULIC DISPLACEMENT PUMP, FOR THE RADIATOR OF AN INTERNAL COMBUSTION ENGINE

The invention relates to a hydrostatic system comprising a hydraulic variable displacement pump, preferably an adjustable axial piston pump and a hydraulic motor connected thereto, preferably an axial piston motor, for driving the fan of a heat exchanger in an internal combustion engine, preferably a diesel engine. According to said inventive hydrostatic system, the variable displacement pump is flange-mounted on the housing of the internal combustion engine in such a way that the drive shaft of the gear driven variable displacement pump is connected to the crankshaft or the timing gears of the internal combustion engine.

HYDRAULIC CONTROLLER

This invention relates to a hydraulic controller having a construction wherein individual operation valves (12, 13) for controlling the oil feed quantity to hydraulic actuators (15, 16) are disposed between a hydraulic pump (10) and the hydraulic actuators (15, 16). In this hydraulic controller, a flow rate regulating solenoid valve (11) is connected to the hydraulic pump (10) in parallel and individual operation opening characteristics which are applied to the single operation of each operation valve (12, 13) and composite operation opening characteristics which are applied to the combinated operation of the operation valves (12, 13) are set in advance as the opening characteristics of the solenoid valve (11). When either one of the operation valves (12, 13) is operated individually, the opening of the solenoid valve (11) is controlled on the basis of a single operation opening characteristics which are to be applied to that operation valve, and when the operation valves (12, 13) are operated ...

AUTOMATIC BOOSTER FOR WORKING MACHINES

A pilot-operated type relief valve (16) is provided for the delivery passages (12a, 12b) of main pumps (11a, 11b), and a relief set pressure variable adjustment means (17) for variably adjusting the relief set pressure to a pressure higher than the initial relief set pressure is provided for the relief valve (16). Pump delivery pressure sensors (32a, 32b) are provided for the delivery passages (12a, 12b), and a head-side pressure sensor (33) is provided for a bucket cylinder (7a). A controller (31) outputs a signal to the relief set pressure variable adjustment means (17) to boost the initial relief set pressure to a higher relief set pressure in the case where the head-side pressure in the bucket cylinder (7a) is not less than the threshold with the pump delivery pressure continuing in its relief state for a given time. The oil pressure drive force is automatically increased during high load operation of a hydraulic shovel so as to improve operability and working efficiency.

HYDRAULIC CONTROL SYSTEM FOR CONSTRUCTION MACHINERY

The present invention relates to a hydraulic control system for construction machinery capable of variably adjusting a set pressure of a relief valve, which controls a set pressure of a hydraulic system, according to a value inputted by means of pressure in the hydraulic system or the manipulation of a joystick. The hydraulic control system comprises: a flow control valve installed in a passage between a hydraulic pump and a hydraulic actuator, for controlling the driving of the hydraulic actuator by being switched by a control signal according to the manipulation of the joystick; a main relief valve installed in a passage between an upstream-side discharge passage of the hydraulic pump and a hydraulic tank, for returning a working fluid to the hydraulic tank when a high load exceeding a set pressure occurs in the system; a pressure controlling means for controlling, either continuously or in stages, a set pressure of the main relief valve; a pressure sensing means for sensing a pressure ...

HYDRAULIC ACTUATOR SYSTEM HAVING DYNAMIC LOAD SENSE BOOST VALVE

A hydraulic actuator system includes a load sense assembly that is configured to transmit a load sense signal to a variable pump to vary a flow of pressurized fluid from the variable pump in response to the load sense signal to generate a desired flow to the actuator. The load sense assembly includes a load sense boost valve (LSBV) configured to dynamically boost the load-sense signal according to the desired margin pressure and the flow demand from the system. When flow demands are low, margin pressure will be above the set threshold of the adjustable LSBV, and no boosting occurs. When flow demands are high and pressure in the load sense line drops to the set threshold, or minimum margin pressure, the LSBV begins boosting the load sense signal pressure dynamically. The boosted load sense signal signals the variable pump to stroke and displace more fluid to increase flow to the actuator.

ГИДРАВЛИЧЕСКАЯ СИСТЕМА И СПОСОБ УПРАВЛЕНИЯ ГИДРАВЛИЧЕСКИМ ИСПОЛНИТЕЛЬНЫМ МЕХАНИЗМОМ

Hydraulische Anordnung

Offenbart ist eine hydraulische Anordnung mit einer verstellbaren Hydromaschine und einem einer ersten Betriebsart der Hydromaschine, insbesondere einem Motorbetrieb zugeordneten Regelventil, über dessen Regelung eine Stellkammer eines Stellzylinders der Hydromaschine mit Druckmittel beaufschlagbar ist. Zudem weist die Anordnung für eine zweite Betriebsart der Hydromaschine, insbesondere für einen Pumpenbetrieb, ein zweites Regelventil zur Druckmittelbeaufschlagung der Stellkammer auf. Über eine Betätigung eines Mittels der Anordnung ist eins der Regelventile aktivierbar oder deaktivierbar und das andere entsprechend deaktivierbar oder aktivierbar, so dass die Regelung in den unterschiedlichen Betriebsarten mit unterschiedlichen Wirkprinzipien und / oder Regelparametern erfolgen kann. Disclosed is a hydraulic arrangement with an adjustable hydraulic machine and a first operating mode of the hydraulic machine, in particular an engine operation associated control valve, via the control of a control chamber of a control cylinder of the hydraulic machine can be acted upon with pressure medium. In addition, the arrangement for a second operating mode of the hydraulic machine, in particular for a pump operation, a second control valve for pressure medium to the actuating chamber. By actuating an arrangement means, one of the control valves can be activated or deactivated and the other can be correspondingly deactivated or activated, so that the control can take place in the different operating modes with different operating principles and / or control parameters.

Steuerungsverfahren für ein teilelektronisches System

Ein Steuerungsverfahren für ein teilelektronisches System, wie ein elektrohydraulisches System, mit mindestens einem elektroproportionalen Stellglied, das in Abhängigkeit seiner Stellgröße (u(t)) zur Beeinflussung mindestens einer physikalischen Regelgröße (y(t)) des eine Regelstrecke aufweisenden Systems dient, ist dadurch gekennzeichnet, dass aus korrelierenden Zustandswerten von Stell-(u(t)) und Regelgröße (y(t)) ein Kennfeld erstellt wird, welches für Steuerungsvorgänge im späteren Betrieb des Systems herangezogen wird.

Hydraulic system

This hydraulic system comprises: an operating device which outputs an operating signal according to a control variable with respect to the operating part; a pump which supplies hydraulic oil to a hydraulic actuator via a control valve; a bleed valve which stipulates the bleed flowrate at which hydraulic oil discharged from the pump is released to a tank; and a control device which controls the bleed valve in such a manner that the opening surface area of the bleed valve is reduced as the operating signal outputted from the operating device increases. The control device varies the opening surface area of the bleed valve between a maximum value and zero along a standard opening line, if sudden acceleration operation is not performed with respect to the operating device; and if a sudden acceleration operation is performed, the opening surface area of the bleed valve is varied between a maximum value and a minimum value that is greater than zero, along a special opening line, from the start ...

Hydraulic drive system for construction machine

Hydraulic system

The hydraulic system according to the present invention is provided with a regulator for adjusting the tilt angle of a pump, and a control device for controlling the regulator so that the discharge flow rate of the pump is equal to the lesser of an operation required flow rate and a horsepower control flow rate, a first horsepower control line and a second horsepower control line lower than the first horsepower control line being stored in the control device, the control device reducing the tilt angle of the pump when a working point exceeds the first horsepower control line in a case in which an operation signal outputted from an operation device is increased and the operation required flow rate is greater than the horsepower control flow rate, the control device increasing the tilt angle of the pump when the working point falls below the second horsepower control line, and the control device maintaining the tilt angle of the pump when a working point that exceeds the first horsepower ...

HYDRAULIC CONTROLLER FOR A CONSTRUCTION MACHINE

Tragbares, akkubetriebenes Hydraulikaggregat für hydraulische Rettungswerkzeuge

Die Erfindung betrifft ein tragbares, akkubetriebenes Hydraulikaggregat (1) für hydraulische Rettungswerkzeuge (4), insbesondere für Spreiz- und/oder Scherenwerkzeuge, sowie ein Verfahren zum Betreiben eines derartigen Hydraulikaggregats (1). Die Erfindung umfasst eine Steuerungsvorrichtung (13), wenigstens eine Hydraulikpumpe (11), wenigstens eine erste und eine zweite Druckleitung (16, 23), welche mit einem Druckabgang (15) der Hydraulikpumpe (11) gekoppelt sind, einen Hydrauliktank (21), wenigstens einen Akkupack und wenigstens einen Elektromotor (12). Des Weiteren ist ein Druckbegrenzungsventil (22) dazu ausgebildet, dass bei Erreichen eines Maximaldrucks in wenigstens einer der Druckleitungen (16, 23) eine Hydraulikflüssigkeit (17) über das Druckbegrenzungsventil (22) und eine mit diesem gekoppelte Rückflussleitung (27) in den Hydrauliktank (21) rückgeführt wird. Zudem ist eine Druckbegrenzungsventil-Zustandserfassung (29) derart ausgebildet, um das Ansprechen des Druckbegrenzungsventils ...

HYDRAULIC UNIT AND PROCEDURE FOR THE CONTROLLING OF THE NUMBER OF REVOLUTIONS OF AN ENGINE IN THE HYDRAULIC UNIT

Tragbares, akkubetriebenes Hydraulikaggregat für hydraulische Rettungswerkzeuge

Die Erfindung betrifft ein tragbares, akkubetriebenes Hydraulikaggregat (1) für hydraulische Rettungswerkzeuge (4), insbesondere für Spreiz- und/oder Scherenwerkzeuge, sowie ein Verfahren zum Betreiben eines derartigen Hydraulikaggregats (1). Die Erfindung umfasst eine Steuerungsvorrichtung (13), wenigstens eine Hydraulikpumpe (11), wenigstens eine erste und eine zweite Druckleitung (16, 23), welche mit einem Druckabgang (15) der Hydraulikpumpe (11) gekoppelt sind, einen Hydrauliktank (21), wenigstens einen Akkupack (5) und wenigstens einen Elektromotor (12). Des Weiteren ist ein Druckbegrenzungsventil (22) dazu ausgebildet, dass bei Erreichen eines Maximaldrucks in wenigstens einer der Druckleitungen (16, 23) eine Hydraulikflüssigkeit (17) über das Druckbegrenzungsventil (22) und eine mit diesem gekoppelte Rückflussleitung (27) in den Hydrauliktank (21) rückgeführt wird. Zudem ist eine Druckbegrenzungsventil-Zustandserfassung (29) derart ausgebildet, um das Ansprechen des Druckbegrenzungsventils ...

HYDRAULIC TAX ARRANGEMENT

CLUTCHED HYDRAULIC SYSTEM FOR A REFUSE VEHICLE

A hydraulic system for a vehicle includes a variable displacement pump configured to pressurize a fluid based on a pump stroke, a clutch, and a controller that is coupled to the variable displacement pump and the clutch. The clutch is positioned to selectively couple the variable displacement pump with an engine when engaged and selectively decouple the variable displacement pump from the engine when disengaged. The controller is configured to generate a first command signal to decrease the pump stroke and thereafter generate a second command signal to disengage the clutch.

No-throttling hydraulic system with multiple actuating mechanism loops

Control circuit for vehicle steering

Circuit d'alimentation en fluide d'un récepteur (120) comprenant une pompe hydraulique à cylindrée fixe (110), un récepteur (120) raccordé à la conduite de refoulement (112) de cette pompe par une conduite (118) dite " de récepteur ". Le circuit comporte des moyens de réglage qui permettent de générer dans la conduite de récepteur (118) une pression de fluide qui dépend du débit de refoulement de la pompe (110) selon une loi de pression déterminée. Ces moyens de réglage comprennent un organe de restriction (116) dont l'entrée est en communication avec la conduite de refoulement (112) et dont la sortie est en communication avec des moyens d'évacuation (126). L'organe de restriction comporte des moyens pour faire varier la section d'évacuation du fluide en fonction du débit de fluide à évacuer. La conduite de récepteur (118) est raccordée à la conduite de refoulement (112) en amont de l'organe de restriction (116) et en dérivation par rapport à ce dernier. Application à la conduite automotive ...

VALVE

COMMAND BASED METHOD FOR ALLOCATING FLUID FLOW FROM A PLURALITY OF PUMPS TO MULTIPLE HYDRAULIC FUNCTIONS

Fluid from two pumps is allocated to a plurality of hydraulic actuators based on a plurality of flow commands, each specifying a desired amount of flow to be applied to a different hydraulic actuator. For a given hydraulic actuator, the allocation involves (1) determining an apportionment of the desired amount of flow, if no other hydraulic actuator is active, and (2) altering the apportionment in response to all the plurality of flow commands, and (3) using the altered apportionment to determine a first amount of the flow for one pump to provide and a second amount of the flow for the other pump to provide. The process is repeated for all the hydraulic actuators. Supply valves for each hydraulic actuator are controlled by the associated first and second amounts and each pump is controlled in response to either the first or second amounts for all the hydraulic actuators.

Hydraulic control circuit and method thereof

Disclosed is a hydraulic control circuit and method thereof for reducing heat generation and energy losses caused by overload. The hydraulic control circuit of the present invention includes a control lever for generating a manipulated signal according to a manipulated variable; a control valve driven by a pilot signal pressure for controlling a flow of the pressurized fluid traveling from the hydraulic pump to the actuator; a displacement sensor for detecting a switching position of the control valve; a pump pressure sensor for detecting a pump pressure applied to the hydraulic pump; an electronic proportional valve for supplying a pilot signal pressure to the control valve; and a controller for receiving the manipulated signal, determining a pilot signal pressure, outputting a control signal to the electronic proportional valve, receiving signals from the displacement sensor and the pump pressure sensor and comparing the signals with pre-stored reference data, and outputting to the electronic ...

Flow control apparatus

In a flow control apparatus, a fluid pressure is introduced from downstream of a metering orifice to a rear room (32) of a spool (20) while a relief valve in the spool (20) is assembled in advance. A front section (41a) of a relief valve sub-assembly (40) is press fitted to a hole (21) provided on the spool and is opening to rear room (32) of the spool so that a receiving room of a valve body in a relief valve casing (41) communicates to a bypass path (13). A communicating path (41b) provided in a rod communicates to the rear room of the spool through outside of the relief valve subassembly (40). The relief valve casing (41) is received in a receiving hole (21) provided in the spool (20) and a cylindrical room between the relief valve casing and the receiving room is used as a part of a communicating path.

ЛЕТАТЕЛЬНЫЙ АППАРАТ

... 1. Летательный аппарат, содержащий: ! - по меньшей мере, одну систему управления пространственным положением в полете, в свою очередь содержащую, по меньшей мере, один исполнительный механизм; и ! - гидравлический контур, соединенный с упомянутым, по меньшей мере, одним исполнительным механизмом и содержащий, по меньшей мере, один насос, выполненный с возможностью выдавать первый расход, когда давление гидравлического контура выше предварительно задаваемого порогового значения; ! отличающийся тем, что упомянутый насос выполнен с возможностью выдавать второй расход, больший, чем упомянутый первый расход; ! причем упомянутый летательный аппарат также отличается тем, что содержит: ! - датчик для обнаружения величины, связанной с давлением упомянутого гидравлического контура; и ! - программируемый центральный блок управления, который управляет упомянутым насосом, чтобы выдавать упомянутый второй расход, когда упомянутая величина, обнаруживаемая упомянутым датчиком, соответствует давлению упомянутого ...

Hydraulischer Antrieb

Die Erfindung betrifft einen hydraulischen Antrieb (A) zum Antreiben von wenigstens einem hydraulischen Aktuator, aufweisend zumindest eine von einem Elektromotor (M) antreibbare Hydraulikpumpe (2) und mindestens eine ein Hydraulikfluid leitende Hydraulikleitung (L), über die die Hydraulikpumpe (2) mit dem hydraulischen Aktuator verbindbar ist. Um einen energieeffizienten und kostengünstig betreibbaren hydraulischen Antrieb (A) bereitzustellen, wird mit der Erfindung vorgeschlagen, dass dieser wenigstens eine Einrichtung (7) zum Erfassen des Ist-Drucks in der Hydraulikleitung (L) sowie eine damit verbundene elektronische Steuereinrichtung (10) aufweist, die mit dem Elektromotor (M) verbunden und derart eingerichtet ist, dass sie den Elektromotor (M) automatisch abschaltet, wenn der erfasste Ist-Druck gleich einem vorgebbaren Soll-Druck oder größer als dieser ist, und automatisch einschaltet, wenn der Ist-Druck kleiner als der Soll-Druck ist.

Hydrauliksystem

Es wird ein Hydrauliksystem (10) mit einem Antriebsmotor (25), einen durch den Antriebsmotor (25) antreibbaren hydraulischen Verstellpumpe (18), einem durch die Verstellpumpe (18) antreibbaren hydraulischen Verbraucher (12) und einer elektronischen Steuereinheit (32) vorgeschlagen, wobei die Verstellpumpe (18) mit einem Förderstromregler (20) ausgestattet ist, mit welchem eine sich zwischen Verbraucher (12) und Verstellpumpe (18) einstellende Druckdifferenz auf einen voreingestellten Regeldruckdifferenzwert regelbar ist. Um die Leistungsabgabe der Verstellpumpe an die Betriebsbedingungen eines Fahrzeugs (44) anzupassen, wird vorgeschlagen, dass der Förderstromregler (20) durch die Steuereinheit (32) ansteuerbare Stellmittel (38, 38') umfasst, durch welche der Regeldruckdifferenzwert am Förderstromregler (20) über die elektronische Steuereinheit (32) veränderbar ist, wobei die elektronische Steuereinheit (32) ein antriebsdrehzahlabhängiges Signal erfasst, in Abhängigkeit dessen durch die Steuereinheit (32) ein Steuersignal für das ansteuerbare Stellmittel (38, 38') generierbar ist, welches den Regeldruckdifferenzwert am Förderstromregler (20) verändert. A hydraulic system (10) with a drive motor (25), a hydraulic variable displacement pump (18) drivable by the drive motor (25), a hydraulic consumer (12) drivable by the variable displacement pump (18) and an electronic control unit (32) are proposed. wherein the variable displacement pump (18) is equipped with a delivery flow regulator (20) with which a pressure difference between the consumer (12) and the variable displacement pump (18) can be regulated to a preset control differential pressure value. In order to adapt the power output of the variable displacement pump to the operating conditions of a vehicle (44), it is proposed that the delivery flow regulator (20) comprises controllable adjusting means (38, 38 ') by the control unit (32) through which the control pressure differential value at the ...

Pressure medium pump, especially for power steering system, has measurement stop in form of electrically controlled switching valve with on/off circuit formed by electrical switch in steering system

The pressure medium pump (1) has a by-pass volume regulation arrangement (6) and a measurement stop for controlling or reducing the flow of the pressure medium to the load. The measurement stop is in the form of an electrically controlled switching valve (7) with an on/off circuit that is formed by an electrical switch (9) in the steering system. An independent claim is also included for the following: (a) a method of controlling a pressure medium pump.

Hydraulisches Antriebssystem

Hydraulisches Antriebssystem (1), umfassend: eine Hydraulikpumpe (10); eine Antriebsquelle (57), die für den Antrieb der Hydraulikpumpe (10) konfiguriert ist; einen Hydraulikzylinder (14), der durch Hydraulikfluid, das von der Hydraulikpumpe (10) abgegeben wird, angetrieben wird; einen Hydraulikfluidweg (15), der zwischen der Hydraulikpumpe (10) und dem Hydraulikzylinder (14) einen geschlossenen Kreis bildet; eine Pumpenflussraten-Steuereinheit (25, 26), die konfiguriert ist für die Steuerung einer Abgabeflussrate der Hydraulikpumpe (10); ein Flussraten-Steuerventil (16), das in dem Hydraulikfluidweg (15) zwischen die Hydraulikpumpe (10) und den Hydraulikzylinder (14) geschaltet ist, wobei das Flussraten-Steuerventil (16) konfiguriert ist für die Steuerung einer Flussrate des Hydraulikfluids, das dem Hydraulikzylinder (14) von der Hydraulikpumpe (10) zugeführt wird; eine Richtungssteuerungseinheit (44, 45), die konfiguriert ist, einen Fluss von Hydraulikfluid von der Hydraulikpumpe (10) zu dem Hydraulikzylinder (14) zuzulassen und einen Fluss von Hydraulikfluid von dem Hydraulikzylinder (14) zur Hydraulikpumpe (10) zu verhindern, wenn über das Flussraten-Steuerventil (16) Hydraulikfluid von der Hydraulikpumpe (10) dem Hydraulikzylinder (14) zugeführt wird; eine Zielflussraten-Einstelleinheit, die konfiguriert ist für die Einstellung einer Zielflussrate von Hydraulikfluid, das dem Hydraulikzylinder (14) zugeführt wird; und eine Steuervorrichtung (24), die konfiguriert ist für ein Steuern einer Flussrate von Hydraulikfluid, das dem Hydraulikzylinder (14) zugeführt wird, durch das Flussraten-Steuerventil (16), wenn die Zielflussrate innerhalb eines vorgegebenen Bereichs liegt, und für ein Steuern einer Flussrate von Hydraulikfluid, das dem Hydraulikzylinder (14) zugeführt wird, durch die Pumpenflussraten-Steuereinheit (25, 26), wenn die Zielflussrate größer als der vorgegebene Bereich ist. A hydraulic drive system (1) comprising: a hydraulic pump (10); a drive source ( ...

Hydraulikmodul

Hydraulikmodul zum Ansteuern wenigstens eines hydraulischen Stellgliedes (2) mit einer Hydraulik-Pumpe (9) in einem Gehäuse (8), mit einem an einer ersten Gehäuseseite (8.1) befestigten Elektromotor (26) zum Antrieb der Pumpe (9), mit einem an einer zweiten, der ersten gegenüberliegenden Gehäuseseite (8.2) vorgesehenen Tank (19) für eine hydraulische Flüssigkeit, z.B. Hydrauliköl, mit im Gehäuse (8) erzeugten Strömungswegen (31 - 34) für die hydraulische Flüssigkeit zum Zuführen dieser Flüssigkeit aus dem Tank (19) an eine Pumpenkammer (11.1), zum Weiterleiten der von der Pumpe (9) geförderten hydraulischen Flüssigkeit an einen am Gehäuse (8) vorgesehenen Druckanschluß zum Anschließen des wenigstens einen Stellgliedes (2) sowie zum Rückführen der hydraulischen Flüssigkeit von dem Druckanschluß (7) in den Tank, dadurch gekennzeichnet, daß in dem Strömungsweg (31, 32, 33) zum Rückführen der hydraulischen Flüssigkeit in den Tank (19) ein elektrisch steuerbares oder regelbares Ventil (36) vorgesehen ...

Hydraulic hoist with lifting cylinder driven by constant output pump

The hoist cylinder receives fluid from a speed controlled electric motor which operates at a minimum speed to provide smooth working and adequate lubrication at very low lifting speeds by diverting excess fluid back to the fluid reservoir. The pump (1) is driven by a three-phase asynchronous motor (2) whose speed is controlled by a frequency converter (3) and electronic control unit (5). A two-way valve (7) directs hydraulic fluid from a reservoir tank (T) to the lifting cylinder (8) and to a by-pass (9) with adjustable throttle valve (10), controlled by the electronic control unit, so that lower pump delivery requirements cause greater flow to the tank.

Controlling speed of electrohydraulic lifting drive involves using range between minimum, maximum revolution rates as proportional working range for controlling electric motor speed

The method involves determining the minimum revolution rate of the constant pump (12), which is a displacement pump, for which a load-dependent motor (23) parameter no longer increases during a ramp acceleration of the motor after the starting process. The range between the minimum and maximum revolution rate is used as a proportional working range for controlling the electric motor speed depending on an operator demand signal.

Electrically driven hydraulic actuator

An electrically driven hydraulic actuator comprises a variable speed motor, a variable capacity displacement pump 20 arranged to be driven by the variable speed motor 10 and a hydraulic actuator 30 driven by the variable displacement pump. A controller 40 varies the speed of motor 10 by a control signal on line 11 and varies the capacity of the pump by means of a control signal long line 21. Operational input requirements for the actuator are fed along line 41. Being able to vary the speed of the motor and the displacement of the pump enables the actuator to be able to be operated very flexibly, and the motor does not have to be driven at an excessively high or low speed, reducing wear and over-heating of the motor.

Command based method for allocating fluid flow from a plurality of pumps to multiple hydraulic functions

Fluid from two pumps is allocated to a plurality of hydraulic actuators based on a plurality of flow commands, each specifying a desired amount of flow to be applied to a different hydraulic actuator. For a given hydraulic actuator, the allocation involves: determining an apportionment of the desired amount of flow, if no other hydraulic actuator is active; altering the apportionment in response to all the plurality of flow commands; and using the altered apportionment to determine a first amount of the flow for one pump to provide and a second amount of the flow for the other pump to provide. The process is repeated for all the hydraulic actuators. Supply valves for each hydraulic actuator are controlled by the associated first and second amounts and each pump is controlled in response to either the first or second amounts for all the hydraulic actuators.

Regeneration device, hydraulic drive system equipped with same, and control device therefor

A regeneration device comprising a regeneration valve for controlling the flow rate of a working liquid discharged from one port of a cylinder, a check valve for allowing a flow for regenerating the working liquid from the regeneration valve to the other port of the cylinder and preventing a flow in the opposite direction thereto, and a discharge valve capable of controlling the flow rate of the working liquid to be discharged to a tank, which is output from the regeneration valve, wherein the regeneration valve controls the flow rate independently from the discharge valve.

LOG CUTTING DEVICE

A device for cutting a log into at least two pieces, comprises at least one elongated cutting blade having a cutting edge with an edge angle of 40° to 48°, and a pressure system for providing a relative displacement between the log and the at least one cutting blade such that the cutting edge thereof and the log contact one another and the log is thereafter cut lenghtwise by the cutting blade. The use of such a cutting blade enables one to considerably reduce the force required for sectioning a log.

Air conditioning demand hydraulic drive system

건설기계의 유압펌프 토출유량 제어방법

... 굴삭기 등의 건설기계에 구비되는 유압펌프 제어시스템을 개시한다. 본 발명에 따른 건설기계의 유압펌프 제어시스템에 있어서, 하부주행체에 대해 상부프레임을 선회 가속시키거나, 주행모터 등의 관성체를 선회시키기 위하여 유압펌프로부터 초기에 유압모터로 필요한 만큼의 작동유를 공급하여 유량 손실을 줄일 수 있도록 한 건설기계의 유압펌프 제어시스템을 제공한다.

Hydraulic module

The invention relates to a new type of hydraulic module for actuating at least one hydraulic control element with a hydraulic pump in a housing, with an electric motor fastened to a first housing side for driving the pump, with a tank located on a second housing side opposite the first side for a hydraulic fluid, e.g. hydraulic oil, with flow channels produced in the housing produced preferably by bore holes for the hydraulic fluid to supply this fluid from the tank to a pump chamber, for transmitting the hydraulic fluid conveyed by the pump to a pressure connection located on the housing, for connection of the at least one actuating element and for returning the hydraulic fluid from the pressure connection into the tank.

Hydraulic drive system

A hydraulic fluid flowpath includes a first flowpath and a second flowpath. The first flowpath connects a first pump port and a first chamber in a hydraulic cylinder. The second flowpath connects a second pump port and a second chamber in the hydraulic cylinder. The hydraulic fluid flowpath forms a closed circuit between a hydraulic pump and the hydraulic cylinder. A bleed-off flowpath bleeds off a portion of the hydraulic fluid from the second flowpath. A control valve connects the second flowpath to the bleed-off flowpath via a throttle when an operation amount of an operating member for lowering a work implement is less than a predetermined operation amount so that a hydraulic pressure in second flowpath is maintained at less than a relief pressure. The predetermined operation amount is less than or equal to the maximum operation amount for lowering the work implement.

OVER-PRESSURE PROTECTION SYSTEM

Example aspects of an over-pressure protection system and a method for using an over-pressure protection system are disclosed. The over-pressure protection system can comprise a main body comprising a main body housing, the main body housing defining a main body chamber; an incompressible fluid received in the main body chamber, the fluid defining a fluid pressure; a pressure sensor for measuring the fluid pressure of the incompressible fluid, the pressure sensor configurable an activated mode and a deactivated mode; a first barrier movable between a first position and a second position; wherein the over-pressure protection system is configurable an under-pressure configuration, wherein the pressure of the incompressible fluid is below a threshold pressure, and an over-pressure configuration, wherein the pressure of the incompressible fluid is equal to or above the threshold pressure; and a control system configuring the pressure sensor in the deactivated mode in the over-pressure configuration 1. An over-pressure protection system comprising:a main body comprising a main body housing, the main body housing defining a main body chamber;an incompressible fluid received in the main body chamber, the fluid defining a fluid pressure;a pressure sensor configured to measure fluid pressure of the incompressible fluid, the pressure sensor configurable in an activated mode and a deactivated mode;a first barrier configured to move between a first position and a second position;wherein the over-pressure protection system is configurable in an under-pressure configuration, wherein the pressure of the incompressible fluid is below a threshold pressure, and an over-pressure configuration, wherein the pressure of the incompressible fluid is equal to or above the threshold pressure; anda control system configured to place the pressure sensor in the deactivated mode in the over-pressure configuration.2. The over-pressure protection system of claim 1 , wherein the control system is ...

Switchable hydrostatic adjusting device

Hydrostatic adjusting device of a hydraulic machine, the swept volume of which can be adjusted by way of a servo adjusting unit, having a control unit which has a control cylinder which has at least one inlet for pressurized hydraulic fluid, at least one servo connector for a connecting line to the servo adjusting unit, and at least one outlet to a hydraulic fluid collecting region. A control piston is arranged in the control cylinder, which control piston can be displaced by means of at least one control piston actuator and has control edges. In interaction with control edges which are configured in the control cylinder, the inlet or the outlet can be alternately connected hydraulically to the connecting line, whereby the pressure which prevails in the connecting line can be returned hydraulically via a control line to at least one end side of the control piston.

Servohydraulic drive

A servohydraulic drive includes a hydrostatic displacement machine, an electric machine that is mechanically speed-coupled with the displacement machine, a hydraulic cylinder that is fluidically connected to the displacement machine via first and second working lines, a hydraulic accumulator, and a supply unit. The displacement machine has a stroke that is adjustable via a hydraulic adjustment device. The cylinder is configured to be activated by reversal of the fluid flow through the displacement machine in opposite directions. The accumulator is preset to a low pressure and is fluidically connected via a valve assembly in each case to the lower pressure working line. The supply unit is configured to supply the adjustment device with pressurized fluid under the necessary pressure for the adjustment regardless of the present pressure in the working lines such that the displacement machine is configured for an active and load pressure-independent adjustment of its stroke volume.

Hydraulic valve and system

An apparatus includes a hydraulic circuit that is configured to selectively open fluid communication between one portion of the hydraulic circuit and another portion of the hydraulic circuit, such as a reservoir, based on the flow of the hydraulic fluid in the one portion. When the flow of hydraulic fluid exceeds a selected threshold in the one portion of the hydraulic circuit, the flow of fluid urges the opening of a hydraulic component of the hydraulic circuit to allow fluid communication between the one portion and the reservoir to discharge fluid from the one portion.

HYDRAULIC CONTROL DEVICE FOR WORKING MACHINE

PROBLEM TO BE SOLVED: To continue operation of a machine even if a control system fails by using an electronic control method for an integrated bleed-off valve. SOLUTION: Bleed-off control is performed by the integrated bleed-off valve 15 common to a plurality of hydraulic actuators 1-3. On condition that an electronic control method for controlling the bleed-off valve 15 with the secondary pressure of a proportional solenoid valve 18 controlled by a controller 17 is employed, the integrated bleed-off valve 15 is provided with a position in which the unload passage is closed in an operation-stopping state of the valve 15 . Control valves 7-9 are provided with a center bypass passage 11 which is opened in the neutral sate of the valves 7-9, wherein an opening characteristic of the control valves 7-9 is set so as to close the center bypass passage 11 at the initial stage of a stroke toward the operation position. COPYRIGHT: (C)2005,JPO&NCIPI ...

СПОСОБ И УСТРОЙСТВО ДЛЯ УПРАВЛЕНИЯ ГИДРАВЛИЧЕСКИ АКТИВИРУЕМЫМ ПРИВОДНЫМ УЗЛОМ АРМАТУРЫ (ВАРИАНТЫ)

FIELD: control systems. SUBSTANCE: invention relates to control method of hydraulically actuated drive unit (1–3), in particular, for valves, wherein at least on part of driving unit permutation path determining speed (v') permutation and is compared with a predetermined permutation speed (v), after which in case of difference between actual value (v') and set value (v) of speed of drive unit (1–3) is changed so that speed (v') of the drive unit permutation is reduced to the specified value (v). EFFECT: technical result is invariable time of reinforcement irrespective of varying ambient temperatures. 15 cl, 8 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 731 353 C2 (51) МПК F15B 11/042 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК F15B 11/0423 (2020.02) (21)(22) Заявка: 2018120596, 03.11.2016 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): ПЛЯЙГЕР МАШИНЕНБАУ ГМБХ УНД КО. КГ (DE) Дата регистрации: 01.09.2020 06.11.2015 DE 10 2015 119 108.3 (43) Дата публикации заявки: 09.12.2019 Бюл. № 34 (56) Список документов, цитированных в отчете о поиске: EP 0111637 A1, 27.06.1984. SU 679952 А, 15.08.1979. US 4215844 A, 05.08.1980. DE 102007007005 A1, 14.08.2008. EP 2123594 A1, 25.11.2009. SU 1110693 A, 30.08.1984. DE 19801338 C1, 02.06.1999. (45) Опубликовано: 01.09.2020 Бюл. № 25 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 06.06.2018 2 7 3 1 3 5 3 Приоритет(ы): (30) Конвенционный приоритет: R U 03.11.2016 (72) Автор(ы): ЛИЧКО Бьерн (DE) EP 2016/076543 (03.11.2016) C 2 C 2 (86) Заявка PCT: (87) Публикация заявки PCT: R U 2 7 3 1 3 5 3 WO 2017/076965 (11.05.2017) Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, стр. 3, ООО "Юридическая фирма Городисский и Партнеры" (54) СПОСОБ И УСТРОЙСТВО ДЛЯ УПРАВЛЕНИЯ ГИДРАВЛИЧЕСКИ АКТИВИРУЕМЫМ ПРИВОДНЫМ УЗЛОМ АРМАТУРЫ (ВАРИАНТЫ) (57) Реферат: Изобретение касается способа управления заданным значением (v) скорости ...

Hydrauliksystem einer Getriebeeinrichtung mit einer Hydraulikpumpe

Es wird ein Hydrauliksystem (1) einer Getriebeeinrichtung mit einer Hydraulikpumpe (2), mit einer Drosseleinrichtung (4) und mit einem Druckregelventil (5) beschrieben. Der Druck stromauf und der Druck stromab der Drosseleinrichtung (4) sind über das Druckregelventil (5) im Bereich von Druckkammern (9, 10) der Hydraulikpumpe (2) zum Einstellen des Fördervolumens der Hydraulikpumpe (2) anlegbar und die Förderseite (3) der Hydraulikpumpe (2) steht mit einem vorsteuerbaren Druckreduzierventil (11) in Wirkverbindung, über das der Druck stromauf des Druckreduzierventils (11) einstellbar ist. Die Druckkammern (9, 10) der Hydraulikpumpe (2) sind über das Druckregelventil (5) mit einer Saugseite (12) der Hydraulikpumpe (2) verbindbar. Die Drosseleinrichtung (4) ist stromab des vorsteuerbaren Druckreduzierventils (11) angeordnet. Am Druckregelventil (5) liegt der im Bereich zwischen dem Druckreduzierventil (11) und der Drosseleinrichtung (4) wirkende Druck sowie der Druck stromab der Drosseleinrichtung ...

Formgebungsmaschine mit hydraulischer Antriebseinheit und Verfahren zum Betreiben

Formgebungsmaschine umfassend eine hydraulische Antriebseinheit (1) mit- einer von einem Motor (3) angetriebenen Pumpe (4),- einer Regel- oder Steuereinheit (5) zur Regelung und/oder Steuerung der Antriebseinheit (1) auf einen Sollbetriebspunkt der Antriebseinheit (1) sowie- einem mit der Regel- oder Steuereinheit (5) verbundenen Speicher (6), dadurch gekennzeichnet, dass im Speicher (6) ein Zusammenhang zwischen einer für einen durch die Antriebseinheit (1) direkt oder indirekt verursachten Schall charakteristischen Größe und einem verschiedene Betriebspunkte der Antriebseinheit (1) repräsentierenden Datensatz hinterlegt ist und dass die Regel- oder Steuereinheit (5) dazu ausgebildet ist, auf Basis des Zusammenhangs den Sollbetriebspunkt auszuwählen.

Hydraulically actuated armature for valves, flaps in aircraft, ships, plant has variable delivery pump with control input for hydraulic signal connected to control motor pressure port

The armature has a control motor (1), a pump (3) in the hydraulic circuit and a motor (4) as the drive for the pump that are combined to form a unit. The pump is a variable delivery pump with a control input (16) for a hydraulic signal connected to a pressure connection of the control motor. An Independent claim is also included for a system with a number of armatures.

Hydraulische Steueranordnung

Offenbart sind eine hydraulische Steueranordnung und ein dafür vorgesehenes vorgesteuertes Druckbegrenzungsventil. Die hydraulische Steueranordnung hat einen Differentialzylinder mit einem kolbenstangenseitigen Druckraum und einem bodenseitigen Druckraum, die über eine Steuerventilanordnung zum Betätigen des Differentialzylinders mit einer Pumpe oder einem Tank verbindbar sind. Der Druck in einem Druckraum wird über ein vorgesteuertes Druckbegrenzungsventil begrenzt, das mit einer Druckumschaltstufe ausgeführt ist, über die der am Druckbegrenzungsventil eingestellte Druck in Abhängigkeit vom Druck im anderen Druckraum der Druckräume absenkbar ist.

Hydraulic system for motor vehicle power steering of e.g. servo steering system, has pump-pressure port connected with load-pressure port, and bypass line provided between pump-pressure port and fluid storage to form overload circuit

The system (10) has a pump-pressure port (18) connected with a load-pressure port (22) via an intake pipe (20). A pump suction port (24) is connected with a load-return port via a fluid storage (12) and a return pipe (26) so that a pump (14) and a load (16) define a main pressure medium circuit (30). A bypass line (36) is provided between the pump-pressure port and the fluid storage to form an overload circuit (34). The intake pipe and the return pipe are sectioned part of the overload circuit. The load is provided with a servo valve of an attached working cylinder.

KINEMATIC CONTROL IN A HYDRAULIC SYSTEM

A hydraulic system is provided, having a pump, operably connected to a motor. It also comprises a controller-driven hydraulic actuator, operably connected to the pump and a hydraulic valve, operable to direct hydraulic fluid to and from either a rod side or a cylinder side of the hydraulic actuator. Rod and cylinder side pressures are pre-defined based on the instantaneous acceleration or deceleration required. Decelerating the hydraulic actuator could involve maintaining the current pressure in the meter-out side of the hydraulic actuator and decreasing the current pressure in the meter-in side by varying the speed of the pump. Deceleration of the hydraulic actuator could also include decreasing pressure on the meter-in side of the hydraulic actuator at a higher rate than on the meter-out side. Acceleration is achieved using a similar approach.

Kinematic control in a hydraulic system

A hydraulic system is provided, having a pump, operably connected to a motor. It also comprises a controller-driven hydraulic actuator, operably connected to the pump and a hydraulic valve, operable to direct hydraulic fluid to and from either a rod side or a cylinder side of the hydraulic actuator. Rod and cylinder side pressures are pre-defined based on the instantaneous acceleration or deceleration required. Decelerating the hydraulic actuator could involve maintaining the current pressure in the meter-out side of the hydraulic actuator and decreasing the current pressure in the meter-in side by varying the speed of the pump. Deceleration of the hydraulic actuator could also include decreasing pressure on the meter-in side of the hydraulic actuator at a higher rate than on the meter-out side. Acceleration is achieved using a similar approach.

Charge bypass system for engine start

The present invention provides an engine start system in a vehicle. The engine start system includes an engine and a charge system. The vehicle also includes an engine speed sensor for measuring a speed of the engine. The charge system is coupled to the engine and includes a charge pump. The vehicle further includes a control unit and a temperature sensor for sensing a temperature of fluid in the charge system. The temperature sensor is electrically coupled to the control unit. A bypass system is fluidly coupled to the charge system and includes a valve and a solenoid. The solenoid is electrically coupled to the control unit such that the control unit energizes the solenoid to control the valve in response to the speed measured by the speed sensor and the temperature sensed by the temperature sensor.

Meterless hydraulic system having multi-actuator circuit

A hydraulic system is disclosed. The hydraulic system may have a pump, a first actuator, and a meterless circuit connecting the first actuator to the pump. The hydraulic system may also have a second actuator connected to the meterless circuit in parallel with the first actuator. The second actuator may be a variable-area linear actuator

Hydraulic control system

A hydraulic control system comprises: a regulator valve, which regulates a fluid pressure established by an oil pump to an operating pressure required in a control circuit; a signal pressure establishing valve, which applies a signal pressure to the regulator valve to determine a level of the fluid pressure to be established by the regulator valve; and an accumulator, which accumulates the operating pressure to be applied to the control circuit. The hydraulic control system is characterized by: an accumulator control valve, which is arranged between the accumulator and the control circuit, and which is adapted to connect the accumulator with the control circuit when opened, and to disconnect the accumulator from the control circuit when closed; and a signal pressure feeding passage, which delivers the signal pressure established by the signal pressure establishing valve to a signal pressure port of the accumulator control valve thereby actuating the accumulator control valve in accordance with the signal pressure.

Hydraulic system for construction machine, provided with protection device

A hydraulic system for a construction machine having a protection device is disclosed, which can limit a flow rate of hydraulic fluid that is discharged from a hydraulic pump in accordance with a hydraulic fluid temperature and notify an operator of information on the hydraulic fluid temperature. The hydraulic system for a construction machine includes a hydraulic actuator operated by hydraulic fluid that is supplied from a hydraulic pump; a control valve installed in a flow path between the hydraulic pump and the hydraulic actuator to control a flow rate of the hydraulic fluid that is supplied from the hydraulic pump to the hydraulic actuator; an oil cooler installed in a return flow path from the control valve to an hydraulic fluid tank to cool the hydraulic fluid; a hydraulic fluid temperature sensor detecting in real time a hydraulic fluid temperature of the hydraulic fluid tank; a hydraulic pump regulator controlling a discharge flow rate of the hydraulic pump through adjustment of an inclination angle of a swash plate of the hydraulic pump; and a controller comparing the hydraulic fluid temperature detected by the hydraulic fluid temperature sensor with a predetermined hydraulic fluid temperature, and outputting a control signal to the hydraulic pump regulator so as to limit the discharge flow rate of the hydraulic pump to or below a predetermined flow rate if the detected hydraulic fluid temperature is equal to or lower than a predetermined lower limit value, or equal to or higher than a predetermined upper limit value.

HYDRAULIC CONTROL SYSTEM

A hydraulic control system includes a flow rate control valve; a variable displacement hydraulic pump which is connected to the flow rate control valve and discharges hydraulic pressure to the flow rate control valve; a pump discharge pressure detector which is installed in a section where the flow rate control valve and the variable displacement hydraulic pump are connected, and detects the discharge pressure of the hydraulic pressure discharged from the variable displacement hydraulic pump to the flow rate control valve; and a hydraulic controller including a detection unit which is connected to the pump discharge pressure detector, detects the discharge pressure of the variable displacement hydraulic pump and converts the discharge pressure to a pump discharge pressure value, a comparison unit which receives the pump discharge pressure value from the detection unit, compares the pump discharge pressure value with a pre-stored lowest recognition pressure value, and determines whether the pump discharge pressure value is greater or less than the lowest recognition pressure value, and a calculation unit which, by interworking with the comparison unit, if the pump discharge pressure value is less than the lowest recognition pressure value, calculates a control pressure by recognizing the control 1. A hydraulic control system comprising:a flow control valve;a variable displacement hydraulic pump connected to the flow control valve to discharge pressurized fluid toward the flow control valve;a pump discharge pressure detector disposed on a passage between the flow control valve and the variable displacement hydraulic pump, the pump discharge pressure detector detecting a discharge pressure of the pressurized fluid discharged toward the flow control valve by the variable displacement hydraulic pump; and a detector connected to the pump discharge pressure detector to convert the detected discharge pressure to a pump discharge pressure value,', 'a comparator receiving the ...

APPARATUS FOR THE PRODUCTION OF AIR GASES BY THE CRYOGENIC SEPARATION OF AIR WITH VARIABLE LIQUID PRODUCTION AND POWER USAGE

An apparatus for the production of air gases by the cryogenic separation of air can include a cold box having a heat exchanger, and a system of columns; a pressure monitoring device; and a controller. The cold box can be configured to receive a purified and compressed air stream under conditions effective for cryogenically separating the air stream to form an air gas product. The apparatus may also include means for transferring the air gas product from the cold box to an air gas pipeline. The pressure monitoring device is configured to monitor the pipeline pressure, and the controller is configured to determine whether to operate in a power savings mode or a variable liquid production mode. By operating the apparatus in a dynamic fashion, a power savings and/or additional high value cryogenic liquids can be realized in instances in which the pipeline pressure deviates from its highest value. 1. An apparatus for the production of air gases by the cryogenic separation of air , the apparatus comprising:{'sub': 'o', 'a) a main air compressor configured to compress air to a pressure suitable for the cryogenic rectification of air to produce a compressed humid air stream, the compressed humid air stream having a first pressure P;'}b) a front end purification system configured to purify the compressed humid air stream of water and carbon dioxide to produce a dry air stream having reduced amounts of water and carbon dioxide as compared to the compressed humid air stream;{'sub': 'B1', 'c) a booster compressor in fluid communication with the front end purification system, wherein the booster compressor is configured to compress a first portion of the dry air stream to form a boosted air stream, the boosted air stream having a first boosted pressure P;'}d) a cold box comprising a main heat exchanger, a system of columns having a double column composed of a lower pressure column and a higher pressure column, a condenser disposed at a bottom portion of the lower pressure column ...

ROTATIONAL SPEED LIMITATION DEVICE FOR A MOTOR

Hydraulic motor for driving a work equipment comprising a hydraulic drive mechanism with a high pressure side and a low pressure side. On the low pressure side a first throttle orifice and a second throttle orifice within a first bypass line bypassing the first throttle orifice are arranged, whereby at least the throttle orifice opening of the second throttle orifice is adjustable. 1. A hydraulic motor for driving a working equipment , with a drive mechanism comprising a high pressure side and a low pressure side whereby on the low pressure side a first throttle orifice and a second throttle orifice within a bypass line which bypasses the first throttle orifice are arranged , whereas at least the orifice opening of the second throttle orifice is adjustable.2. The hydraulic motor according to claim 1 , whose first throttle orifice comprise a fixed orifice opening.3. The hydraulic motor according to claim 1 , in which the second throttle orifice is formed as a metering orifice whose orifice opening claim 1 , can be closed in the manner of a flow control valve against an elastic force by a pressure after the driving mechanism and before the measuring orifice.4. The hydraulic motor according to claim 1 , in which the orifice opening of the second throttle orifice is adjustable by means of an actuator which is operable mechanically claim 1 , hydraulically claim 1 , electrically or pneumatically by means of a control device.5. The hydraulic motor according to claim 1 , whose displacement is adjustable.6. The hydraulic motor according to claim 1 , wherein the hydraulic motor can be operated in both rotational directions.7. The hydraulic motor according to claim 6 , in which on each of both sides of the driving mechanism a first throttle orifice and a second throttle orifice within a bypass line which bypasses the first throttle orifice are arranged claim 6 , whereas at least the orifice opening of each of the second throttle orifices is adjustable and whereby in each of ...

AUXILIARY POWER UNIT FOR MOBILE SERVICE VEHICLE

An auxiliary power unit system for mobile service vehicles is provided that can provide DC power to DC-powered equipment. The system attaches to the power take-off port of the transmission and can provide power to the DC-powered equipment without idling the engine of the mobile service vehicle, thereby reducing fossil fuel consumption and engine exhaust emissions. 1. An auxiliary power unit system for operating hydraulically-operated equipment , the system configured to be disposed in or on a mobile service vehicle comprising an internal combustion engine operatively coupled to a transmission and at least one alternator operatively coupled to the engine , the transmission comprising a power take-off (“PTO”) port , the system comprising:a) a first hydraulic pump operatively coupled to the PTO port;b) a hydraulic motor/pump operatively coupled to the first hydraulic pump via a control block/valve, the control block/valve configured to operatively couple to the hydraulically-operated equipment;c) a direct current (“DC”) electric motor/generator operatively coupled to the hydraulic motor/pump via a first clutch; andd) at least one battery operatively coupled to the DC electric motor/generator via one or both of a charger control circuit and a motor control circuit, wherein the charger control circuit is operatively coupled to the at least one alternator.2. The system as set forth in claim 1 , wherein the first clutch comprises one of a one-way free-wheeling clutch claim 1 , an electrically-operated clutch and a centrifugal clutch.3. The system as set forth in claim 1 , further comprising one or both of an air conditioning compressor and a second hydraulic pump operatively coupled to the DC electric motor/generator.4. The system as set forth in claim 1 , wherein the charger control circuit is configured to operatively couple with the at least one alternator.5. The system as set forth in claim 1 , further comprising an alternating current (“AC”) inverter operatively ...

SYSTEM FOR CONTROLLING CONSTRUCTION MACHINE AND METHOD FOR CONTROLLING CONSTRUCTION MACHINE

A control system for construction machinery, includes a hydraulic pump, at least one control valve installed in a center bypass line connected to the hydraulic pump and configured to control a flow direction of a working oil discharged from the hydraulic pump to selectively supply the working oil to an actuator, a bypass control valve installed downstream from the control valve in the center bypass line to variably control an amount of the working oil draining to a drain tank through the center bypass line, and a controller configured to control operations of the hydraulic pump and the bypass control valve according to a manipulation signal of an operator and to open the bypass control valve according to pump peak occurrence to reduce a pump peak. 1. A control system for construction machinery , comprising:a hydraulic pump;at least one control valve installed in a center bypass line connected to the hydraulic pump, and configured to control a flow direction of a working oil discharged from the hydraulic pump to selectively supply the working oil to an actuator;a bypass control valve installed downstream from the control valve in the center bypass line to variably control an amount of the working oil draining to a drain tank through the center bypass line; anda controller configured to control operations of the hydraulic pomp and the bypass control valve according to a manipulation signal of an operator, and to open the bypass control valve according to pump peak occurrence to reduce a pump peak.2. The control system for construction machinery of claim 1 , wherein the controller comprisesa sudden stop determiner determining whether or not a sudden stop manipulation of the actuator occurs, based on a joystick manipulation signal;a calculator determining an opening area of the bypass control valve in case of the sudden stop manipulation of the actuator; andan output portion outputting a control signal for opening the bypass control valve according to the calculated ...

Hydraulic Fluid Energy Regeneration Apparatus of Work Machine

A hydraulic fluid energy regeneration apparatus of a work machine includes: a regeneration hydraulic motor driven by a return hydraulic fluid; a first hydraulic pump mechanically connected to the regeneration hydraulic motor; a second hydraulic pump that delivers a hydraulic fluid for driving a hydraulic actuator; a confluence line that causes the hydraulic fluid delivered from the first hydraulic pump to join the hydraulic fluid delivered from the second hydraulic pump; a first adjuster configured to adjust the flow rate of the hydraulic fluid of the first hydraulic pump; and a second adjuster configured to adjust the delivery flow rate of the second hydraulic pump. A control device includes: a first calculation section configured to calculate a non-confluence time pump flow rate in the case where the hydraulic actuator is driven solely by the second hydraulic pump and calculate a control command output to the first adjuster such that the flow rate of the hydraulic fluid from the first hydraulic pump is equal to or lower than the non-confluence time pump flow rate; and a second calculation section configured to calculate a target pump flow rate by subtracting from the non-confluence time pump flow rate the flow rate of the hydraulic fluid from the first hydraulic pump and calculate a control command output to the second adjuster such that the target pump flow rate is attained.

HYDRAULIC DRIVE SYSTEM

A hydraulic driving system includes a hydraulic pump, a driving source, a hydraulic cylinder, a closed circuit hydraulic path between the pump and cylinder, a pump-flow-rate control unit controlling a discharge flow rate of the pump, a flow rate control valve between the pump and the cylinder in the fluid path, a directional control unit, a target flow rate setting unit and a control device. The directional control unit allows a flow of fluid from the pump to the cylinder and prohibits a flow of fluid from the cylinder to the pump when fluid is supplied from the pump to the cylinder via the flow rate control valve. The control device controls fluid flow to the cylinder with the flow rate control valve when the target flow rate is within a prescribed range, and with the pump-flow-rate control unit when the target flow rate is greater than the prescribed range. 1. A hydraulic driving system comprising:a hydraulic pump;a driving source configured to drive the hydraulic pump;a hydraulic cylinder configured to be driven by hydraulic fluid discharged from the hydraulic pump;a hydraulic fluid path forming a closed circuit between the hydraulic pump and the hydraulic cylinder;a pump-flow-rate control unit configured to control a discharge flow rate of the hydraulic pump;a flow rate control valve disposed between the hydraulic pump and the hydraulic cylinder in the hydraulic fluid path, the flow rate control valve being configured to control a flow rate of hydraulic fluid supplied to the hydraulic cylinder from the hydraulic pump;a directional control unit configured to allow a flow of hydraulic fluid from the hydraulic pump to the hydraulic cylinder and prohibit a flow of hydraulic fluid from the hydraulic cylinder to the hydraulic pump when hydraulic fluid is supplied from the hydraulic pump to the hydraulic cylinder via the flow rate control valve;a target flow rate setting unit configured to set a target flow rate of hydraulic fluid supplied to the hydraulic cylinder; ...

WHEELCHAIR LIFT WITH LOW ENERGY CONSUMPTION

A wheelchair lift with low energy consumption includes a platform assembly to receive a wheelchair. The wheelchair lift includes a hydraulic drive system to move the platform assembly between an entry level position and a ground level position. The wheelchair lift includes a fluid circuit being embodied to transport a hydraulic fluid from a tank using a pump driven by an electric motor to the hydraulic drive system to raise the platform assembly from the ground level position to the entry level position. The fluid circuit is further embodied to transport the hydraulic fluid from the hydraulic drive system via the pump to the tank, when lowering the platform assembly from the entry level position to the ground level position. 1. A wheelchair lift with low energy consumption , comprising:{'b': '10', 'a platform assembly () to receive a wheelchair;'}{'b': 20', '10', '2', '3', '20', '21', '22, 'a lifting assembly () to move the platform assembly () between an entry level position () and a ground level position () which is below the entry level position, wherein the lifting assembly () comprises a hydraulic drive system (, );'}{'b': 100', '110, 'a tank () to provide a hydraulic fluid ();'}{'b': 120', '110', '100', '21', '22, 'a pump () to pump the hydraulic fluid () from the tank () to the hydraulic drive system (, );'}{'b': 130', '120', '130', '130', '130', '120, 'an electric motor () to drive the pump (), wherein the electric motor () comprises a terminal (T) to apply an operating voltage to operate the electric motor () for driving the pump (); and'}{'b': 140', '110', '100', '21', '22', '10', '3', '2, 'a fluid circuit () being embodied to transport the hydraulic fluid () from the tank () to the hydraulic drive system (, ) to raise the platform assembly () from the ground level position () to the entry level position ();'}{'b': 140', '110', '21', '22', '120', '100', '10', '2', '3, 'wherein the fluid circuit () is further embodied to transport the hydraulic fluid () ...

Systems and Methods for Operating a Direct Current Hydraulic Pump

System and methods for a DC powered hydraulic system capable of providing control over pressurized hydraulic fluid delivered to directional valves without the need for a PTO and/or a proportional valve. The hydraulic system controls the output from a battery to a direct current hydraulic pump.

Turn-driving apparatus for work machine

A turn-drive apparatus capable of securing high acceleration at the time of turning start with a reduced relief loss includes a hydraulic pump of a variable capacity type, a turning motor, a turning control device, a relief valve, and a flow rate control device that controls a pump flow rate. The flow rate control device calculates a relief-cut-control target pump flow rate on the basis of the sum of a minimum relief flow rate and a turning-speed flow rate, and inputs a pump capacity command to the variable capacity-type hydraulic pump based thereon. The flow rate control device makes the relief-cut-control target pump flow rate larger than the sum of the minimum relief flow rate and the turning-speed flow rate at the time of turning start.

Hydraulic valve and system

An apparatus includes a hydraulic circuit that is configured to selectively open fluid communication between one portion of the hydraulic circuit and another portion of the hydraulic circuit, such as a reservoir, based on the flow of the hydraulic fluid in the one portion. When the flow of hydraulic fluid exceeds a selected threshold in the one portion of the hydraulic circuit, the flow of fluid urges the opening of a hydraulic component of the hydraulic circuit to allow fluid communication between the one portion and the reservoir to discharge fluid from the one portion.

Hydraulic circuit for a patient handling apparatus

A patient handling apparatus includes a patient support surface, a base, and a hydraulic circuit. The hydraulic circuit includes a pump, a fluid reservoir, and a hydraulic cylinder operable to selectively raise or lower the patient support surface or the base. The hydraulic circuit controls flow of fluid between the cylinder and the fluid reservoir to thereby control the movement of the base or patient support surface. In addition, the hydraulic circuit may include a manual bypass circuit configured to bypass the pump in response to a manual input, which allows manual extension or retraction of the cylinder, for example, when the pump is not operational. The hydraulic circuit may also include a pump bypass circuit configured to bypass the pump to allow fluid to discharge from the cap end to the fluid reservoir for faster evacuation of fluid from the cylinder, thereby increasing retraction speed of the rod.

DRIVING DEVICE FOR WORK MACHINE AND WORK MACHINE EQUIPPED THEREWITH

There is provided a driving device for a work machine, having a closed hydraulic circuit system for driving cylinders with hydraulic pumps, the driving device making the speed of operation substantially the same in both directions of piston rod extension and contraction. The driving device includes: a first hydraulic pump that has flow rate control device for controlling the flow rate and direction of hydraulic fluid to be delivered; a single rod hydraulic cylinder that is driven with the hydraulic fluid to drive one of work members of a work device on the work machine; a closed hydraulic circuit that connects the first hydraulic pump with the single rod hydraulic cylinder to form a closed circuit using flow lines through which the hydraulic fluid flows; a branch line that branches from the flow line between the first hydraulic pump and the single rod hydraulic cylinder; a first flow line of which one end is connected to the branch line; a tank to which the other end of the first flow line is connected; and a hydraulic fluid flow rate control device attached to the first flow line to control the flow rate of the hydraulic fluid flowing from the branch line to the tank or from the tank to the branch line. 1. A driving device for a work machine , comprising:a first hydraulic pump that has flow rate control device for controlling the flow rate and direction of hydraulic fluid to be delivered;a single rod hydraulic cylinder that is driven with the hydraulic fluid to drive one of work members of a work device on the work machine;a closed hydraulic circuit that connects the first hydraulic pump with the single rod hydraulic cylinder to form a closed circuit using flow lines through which the hydraulic fluid flows;a branch line that branches from the flow line between the first hydraulic pump and the single rod hydraulic cylinder;a first flow line of which one end is connected to the branch line;a tank to which the other end of the first flow line is connected; anda ...

Hydraulic system

A hydraulic system includes: a regulator that adjusts a tilting angle of a pump; and a controller that controls the regulator such that a discharge flow rate of the pump is a lower one of an operation-requiring flow rate and a horsepower control flow rate. The controller stores a first horsepower control line and a second horsepower control line lower than the first control line. When an operating point exceeds the first horsepower control line, the controller decreases the tilting angle of the pump; when the operating point falls below the second horsepower control line, the controller increases the tilting angle of the pump. When the operating point exceeds the first control line or falls below the second control line, it is shifted and positioned between the first control line and the second horsepower control line, keeping the tilting angle of the pump as it is.

Hydraulic drive system

A hydraulic fluid flowpath includes a first flowpath and a second flowpath. The first flowpath connects a first pump port and a first chamber in a hydraulic cylinder. The second flowpath connects a second pump port and a second chamber in the hydraulic cylinder. The hydraulic fluid flowpath forms a closed circuit between a hydraulic pump and the hydraulic cylinder. A bleed-off flowpath bleeds off a portion of the hydraulic fluid from the second flowpath. A control valve connects the second flowpath to the bleed-off flowpath via a throttle when an operation amount of an operating member for lowering a work implement is less than a predetermined operation amount so that a hydraulic pressure in second flowpath is maintained at less than a relief pressure. The predetermined operation amount is less than or equal to the maximum operation amount for lowering the work implement.

HYDRAULIC DRIVE SYSTEM AND METHOD FOR DRIVING A BELT CONVEYOR

The invention relates to a hydraulic drive system for a belt conveyor with a motor-driven primary pump which is arranged in a hydraulic primary circuit and is intended for conveying hydraulic fluid, a hydraulic motor which is supplied with hydraulic fluid via the primary circuit and is intended for driving the belt conveyor, and a control device which influences the flow of hydraulic fluid in the primary circuit and is intended for controlling the belt speed of the belt conveyor. In exemplary embodiments, the primary pump is a variable displacement pump and has a pump regulator for regulating the conveyed flow of hydraulic fluid, and the control device comprises a hydraulic control circuit, which is operated by means of an auxiliary pump, for subjecting the pump regulator to an adjustable actuating pressure. 1. A hydraulic drive system for a belt conveyor of the type used on a mobile conveying appliance , the drive system comprising:a motor-driven primary pump arranged in a hydraulic primary circuit for conveying hydraulic fluid, the primary pump being a variable displacement pump having a pump regulator for regulating the conveyed hydraulic fluid stream;a hydraulic motor supplied with hydraulic fluid via the primary circuit for driving the belt conveyor; anda controller that influences the hydraulic fluid stream in the primary circuit for controlling the belt speed of the belt conveyor, the controller comprising a hydraulic control circuit operated by an auxiliary pump for acting upon the pump regulator with an adjustable actuating pressure.2. The drive system as claimed in claim 1 , wherein the primary pump is directly connected claim 1 , free of valves claim 1 , on the delivery side to the hydraulic motor via a delivery line of the primary circuit.3. The drive system as claimed in claim 1 , wherein the primary circuit is closed and the primary pump is arranged in the primary circuit claim 1 , the hydraulic motor being directly connected on the outlet side to the ...

HYDRAULIC SYSTEM

A hydraulic system includes: an operation device that outputs an operation signal corresponding to an operating amount of an operating unit; a pump that supplies hydraulic oil to a hydraulic actuator via a control valve; a bleed valve that defines a bleed flow rate, at which the hydraulic oil is released to a tank; and a controller that controls the bleed valve, so an opening area of the valve decreases in accordance with increase in the operation signal. The controller: when a rapid acceleration operation is not performed on the device, changes the opening area of the valve between a maximum value and zero along a normal opening line; and when the rapid acceleration operation is performed, changes the opening area of the valve between the maximum value and minimum value greater than zero along a special opening line from when the operation is started until a predetermined time elapses. 1. A hydraulic system comprising:an operation device that outputs an operation signal corresponding to an operating amount of an operating unit;a pump that supplies hydraulic oil to a hydraulic actuator via a control valve;a bleed valve that defines a bleed flow rate, at which the hydraulic oil discharged from the pump is released to a tank; anda controller that controls the bleed valve, such that an opening area of the bleed valve decreases in accordance with increase in the operation signal outputted from the operation device, whereinthe controller determines whether or not a rapid acceleration operation is performed on the operation device, and in a case where the rapid acceleration operation is not performed, changes the opening area of the bleed valve between a maximum value and zero along a normal opening line; and', 'in a case where the rapid acceleration operation is performed, changes the opening area of the bleed valve between the maximum value and a minimum value greater than zero along a special opening line from when the rapid acceleration operation is started until when ...

Construction Machine

An object of the present invention is to provide a construction machine capable of suppressing lugging down of an engine irrespective of contents of operation of an operator and the load state of a hydraulic actuator. A controller 50 includes: a demanded torque estimating section 50c configured to estimate demanded torque as torque demanded from an engine 9 by the first hydraulic pump on the basis of a demanded velocity of a first hydraulic actuator 1 and a load pressure on the first hydraulic actuator; a demanded velocity limiting section 50d configured to, in a case in which a demanded torque change rate as a change rate of the demanded torque exceeds a predetermined change rate, limit the demanded velocity such that the demanded torque change rate becomes equal to or lower than the predetermined change rate; and a command calculating section 50e configured to calculate a delivery flow rate of the first hydraulic pump on the basis of the demanded velocity of the first hydraulic actuator, the demanded velocity being limited by the demanded velocity limiting section.

HYDRAULIC CONTROL DEVICE FOR FORKLIFT

A hydraulic control device for a forklift includes a hydraulic pump, a single electric motor for driving the hydraulic pump, an outflow control mechanism provided between a lift cylinder and the hydraulic pump, a flow control valve provided between the outflow control mechanism and a draining portion, and a controller. When a lowering operation of a fork and either forward or rearward mast tilting operations of a mast are performed at the same time, the controller controls the electric motor based on a target speed of the hydraulic pump. The flow control valve controls the flow rate of hydraulic fluid from the lift cylinder to the hydraulic pump and the flow rate from the lift cylinder to the draining portion in accordance with the difference between the actual rotation speed of the hydraulic pump and the target rotation speed of the hydraulic pump. 1. A hydraulic control device for a forklift , whereinthe hydraulic control device selectively raises and lowers a fork by supplying hydraulic fluid to a lift cylinder or discharging hydraulic fluid from the lift cylinder through manipulation of a raising/lowering instruction member,the hydraulic control device tilts a mast to which the fork is attached selectively forward and rearward by supplying hydraulic fluid to a tilt cylinder and/or discharging hydraulic fluid from the tilt cylinder through manipulation of a tilting instruction member,the hydraulic control device comprises:at least one hydraulic pump;a single electric motor for driving the hydraulic pump;an outflow control mechanism arranged between the lift cylinder and the hydraulic pump, wherein the outflow control mechanism permits hydraulic fluid to flow from a bottom chamber of the lift cylinder to the hydraulic pump when the fork is lowered, and the outflow control mechanism prohibits hydraulic fluid from flowing from the bottom chamber of the lift cylinder to the hydraulic pump when the fork is in a stopped state or raised;a flow control valve arranged ...

Work Machine

Provided is a work machine including: a variable-displacement pump an actuator driven by a hydraulic fluid delivered from the pump a flow control valve of an open-center type that controls a flow rate of the hydraulic fluid supplied to the actuator a bleed-off line connecting the actuator flow control valve to a tank a bleed-off flow control valve disposed in the bleed-off line an operating device that specifies operation of the actuator a bleed-off control device that controls a degree of opening of the bleed-off flow control valve in accordance with an amount of manipulation of the operating device and a pump control device that controls, in accordance with the degree of opening of the bleed-off flow control valve a pump flow rate by correcting a reference pump flow rate that is based on the amount of manipulation of the operating device The work machine with this configuration can save energy while at the same time inhibiting an occurrence of a sense of strangeness or discomfort in particular operation. 1. A work machine comprising:a variable-displacement pump;an actuator driven by a hydraulic fluid delivered from the pump;a flow control valve of an open-center type that controls a flow rate of the hydraulic fluid supplied to the actuator;a bleed-off line connecting the actuator flow control valve to a tank;a bleed-off flow control valve disposed in the bleed-off line;an operating device that specifies operation of the actuator;a bleed-off control device that controls a degree of opening of the bleed-off flow control valve in accordance with an amount of manipulation of the operating device; anda pump control device that controls, in accordance with the degree of opening of the bleed-off flow control valve, a pump flow rate by correcting a reference pump flow rate that is based on the amount of manipulation of the operating device.2. The work machine according to claim 1 , whereinthe bleed-off control device is adapted to selectively execute one of a first mode ...

Systems and Methods for Operating a Direct Current Hydraulic Pump

System and methods for a DC powered hydraulic system capable of providing control over pressurized hydraulic fluid delivered to directional valves without the need for a PTO and/or a proportional valve. The hydraulic system controls the output from a battery to a direct current hydraulic pump. 1. A controller for operating a hydraulic system with an axis of operation , a battery with a battery output , and a direct current (DC) hydraulic pump , the controller comprising:an axis switch in operative communication with the axis of operation in the hydraulic system; anda trigger switch configured to control the battery output to the DC hydraulic pump.2. The controller according to claim 1 , wherein the hydraulic system has a receiver and the controller further comprises a transmitter configured to transmit the position of the axis switch and the position of the trigger switch to the receiver of the hydraulic system.3. The controller according to claim 1 , wherein the axis switch is a two-way momentary switch.4. The controller according to claim 1 , wherein the trigger switch is a variable speed switch.5. A hydraulic system comprising:a machine with an axis of operation;a directional valve operatively connected to the axis of operation;a direct current (DC) hydraulic pump operatively connected to the directional valve;a controller;a battery with a battery output; anda command center in electrical communication with the hydraulic pump, the controller, and the battery;whereby the controller communicates with the command center, operation of the directional valve and the battery output to the hydraulic pump.6. The hydraulic system of claim 5 , wherein the controller further comprises an axis switch and a trigger switch claim 5 , both configured to be in communication with the command center claim 5 , whereby operation of the axis switch corresponds to the operation of the directional valve and operation of the trigger switch corresponds to the battery output provided to the ...

HYDRAULIC SYSTEM AND METHOD OF CONTROLLING HYDRAULIC ACTUATOR

A hydraulic system, a mobile mining machine and to a method of controlling a hydraulic actuator is provided. The hydraulic system includes two hydraulic pumps (P, P) for generating hydraulic power for a hydraulic actuator. The pumps are powered by means of a common electric motor. Operation of the actuator is controlled by controlling speed and direction of the motor, whereby hydraulic lines () may be without actively controlled control valves. 1. A hydraulic system of a mobile work machine comprising:at least one hydraulic pump arranged to generate hydraulic fluid flow and pressure to a hydraulic circuit;at least one electric motor arranged to rotate the at least one hydraulic pump;at least one hydraulic actuator connected to the hydraulic circuit; andat least one control device for controlling operation of the hydraulic system, the at least one hydraulic pump including a first hydraulic pump and a second hydraulic pump, the first hydraulic pump being connected to a first working pressure space of the hydraulic actuator by a first hydraulic line and the second hydraulic pump being connected to a second working pressure space of the hydraulic actuator by a second hydraulic line, and wherein pressure of the hydraulic fluid prevailing in the first working pressure space and the second pressure space are configured to cause inversely directed forces for a moving element of the hydraulic actuator, the at least one electric motor being one common electric motor configured to rotate the two hydraulic pumps simultaneously, the first and second hydraulic pumps having inverse pumping characteristics so that when the first hydraulic pump generates a pressure the second hydraulic pump generates a suction, and vice versa, and wherein movement speed and direction of the hydraulic actuator are controlled by controlling rotational speed and direction of the common electric motor.2. The hydraulic system as claimed in claim 1 , comprising one single hydraulic actuator claim 1 , ...

CONTROL SYSTEM AND WORK MACHINE

A control system includes: calculating a distribution flow rate of hydraulic fluid to be supplied to first and second hydraulic actuators based on a pressure of hydraulic fluid in the first and second hydraulic actuators and an operation amount operated to drive the first and second hydraulic actuators; calculating merged-state pump output indicating outputs of first and second hydraulic pumps required in a merged state based on the distribution flow rate; calculating separated-state pump output indicating outputs of the first and second hydraulic pumps required in the separated state based on the distribution flow rate; calculating excessive output of an engine based on the merged-state pump output and the separated-state pump output; calculating reduced output of the engine more reduced than target output by correcting the target output of the engine based on the excessive output; and controlling the engine based on the reduced output in the separated state. 1. A control system , comprising:an engine;a first hydraulic pump and a second hydraulic pump driven by the engine;a switching device provided in a flow path that connects the first hydraulic pump to the second hydraulic pump, and configured to perform switching between a merged state in which the flow path is opened and a separated state in which the flow path is closed;a first hydraulic actuator to which hydraulic fluid discharged from the first hydraulic pump is supplied in the separated state;a second hydraulic actuator to which hydraulic fluid discharged from the second hydraulic pump is supplied in the separated state;a distribution flow rate calculation unit configured to calculate a distribution flow rate of the hydraulic fluid to be supplied to each of the first hydraulic actuator and the second hydraulic actuator on the basis of a pressure of hydraulic fluid in each of the first hydraulic actuator and the second hydraulic actuator and an operation amount of an operation device operated in order to ...

Adaptive control of hydraulic tool on remote controlled demolition robot

A remote controlled demolition robot ( 10 ) comprising a controller ( 17 ) and at least one actuator ( 12 ) controlled through a hydraulic system ( 400 ) comprising at least one valve ( 13 a ) connected to a corresponding actuator for a tool ( 11 b ) and a pump ( 410 ). The controller ( 17 ) is configured to operate in a first mode wherein the fluid flow is controlled through the at least one valve ( 13 a ), wherein said valve ( 13 a ) is a proportional valve, receive a pressure indication indicating a pressure in the hydraulic system ( 400 ) and determine if the pressure in the hydraulic system ( 400 ) is above a first mode threshold and/or if a pressure change fulfills a first mode condition, and if so operate in a second mode wherein the at least one valve ( 13 a ) is in an opened state and the fluid flow is controlled through the pump ( 410 ).

METHOD AND DEVICE FOR CONTROLLING A HYDRAULICALLY ACTUATED DRIVE UNIT OF A VALVE

The invention relates to a method for controlling a hydraulically actuated drive unit (-), especially for a valve or control device, wherein at least on a part of the displacement of the drive unit the displacement speed (v′) is detected and compared with a predetermined target displacement speed (v), whereupon in the case of a difference between actual value (v′) and target value (v) of the speed, the controlling of the drive unit (-) is changed such that the displacement speed (v′) of the drive unit is adapted to the target value (v). 113. Method for controlling a hydraulically actuated drive unit (-) especially for a valve or control device , wherein at least on a part of the displacement of the drive unit the displacement speed (v′) is detected and compared with a predetermined target displacement speed (v) ,{'b': 1', '3, 'whereupon in the case of a difference between actual value (v′) and target value (v) of the speed, the controlling of the drive unit (-) is changed such that the displacement speed (v′) of the drive unit is adapted to the target value (v).'}2. Method according to claim 1 , wherein the displacement speed (v′) is detected by means of a combination of distance measurement and time measurement of the displacement at at least two measuring points.31313. Method according to claim 1 , wherein the displacement speed (v′) of the drive unit (-) is measured on a partial section (S to S) and used as a basis for calculating the time for displacing over the remaining displacement path.4131. Method according to claim 3 , wherein the displacement speed (v′) at the beginning of the displacement is measured on a partial section (S-S) starting from the end position (S).513. Method according to claim 1 , wherein the displacement speed (v′) of the drive unit (-) is detected continuously and compared with the predetermined target displacement speed (v) claim 1 , whereupon in the occurrence of a difference between target value and actual value the controlling of the ...

HYDRAULIC SYSTEM AND METHOD FOR CONTROLLING SAME

A hydraulic system includes an engine; at least one hydraulic pump operatively coupled to the engine for transfer of mechanical power therebetween; and a controller operatively coupled to the engine and the at least one hydraulic pump. The controller is configured to determine a lug speed error as a difference between a target lug speed value and a speed of the engine, set at least one closed-loop gain to a non-zero value when the speed of the engine is less than the target lug speed value, and generate a pump control signal by scaling the lug speed error by the at least one closed-loop gain. 1. A hydraulic system , comprising:an engine;at least one hydraulic pump operatively coupled to the engine for transfer of mechanical power therebetween; and determine a lug speed error as a difference between a target lug speed value and a speed of the engine,', 'set at least one closed-loop gain to a non-zero value when the speed of the engine is less than the target lug speed value,', 'generate a pump control signal by scaling the lug speed error by the at least one closed-loop gain,', 'receive a first pressure signal based on a discharge pressure of the at least one hydraulic pump,', 'generate a first open-loop signal based at least in part on the first pressure signal and a target engine speed value,', 'superimpose the first open-loop signal with the pump control signal to generate a superimposed pump control signal, and', 'transmit the superimposed pump control signal to the at least one hydraulic pump for controlling a load applied to the engine by the at least one hydraulic pump., 'a controller operatively coupled to the engine and the at least one hydraulic pump, the controller being configured to'}2. The hydraulic system of claim 1 , wherein the scaling the lug speed error by the at least one closed-loop gain includesgenerating an integrated lug speed error value by integrating the lug speed error with time, andscaling the integrated lug speed error value by an ...

OVER-PRESSURE PROTECTION SYSTEM

Example aspects of an over-pressure protection system and a method for operating an over-pressure protection system are disclosed. The over-pressure protection system can comprise a main body housing defining a main body chamber; a fluid received in the main body chamber, the fluid defining a fluid pressure; a pressure sensor configured to measure the fluid pressure of the fluid, the pressure sensor configurable in an activated mode and a deactivated mode; and a control system configured to place the pressure sensor in the deactivated mode when the fluid pressure is equal to or above a pre-determined threshold pressure. 1. An over-pressure protection system comprising:a main body housing defining a main body chamber;a fluid received in the main body chamber, the fluid defining a fluid pressure;a pressure sensor configured to measure the fluid pressure of the fluid, the pressure sensor configurable in an activated mode and a deactivated mode; anda control system configured to place the pressure sensor in the deactivated mode when the fluid pressure is equal to or above a pre-determined threshold pressure.2. The over-pressure protection system of claim 1 , wherein the control system is configured to place the pressure sensor in the activated mode when the fluid pressure is below the pre-determined threshold pressure.3. The over-pressure protection system of claim 1 , further comprising a barrier configured to move between a first position and a second position within the main body chamber.4. The over-pressure protection system of claim 3 , wherein the barrier defines a seal and the main body chamber defines a stop surface claim 3 , and wherein the seal is disengaged from the stop surface in the first position and the seal engages with the stop surface in the second position.5. The over-pressure protection system of claim 3 , wherein the barrier is a flexible diaphragm.6. The over-pressure protection system of claim 1 , wherein:the over-pressure protection system ...

hydraulic module

Die Erfindung bezieht sich auf eine neuartige Ausbildung eines Hydraulikmoduls zum Ansteuern wenigstens eines hydraulischen Stellgliedes mit einer Hydraulik-Pumpe in einem Gehäuse, mit einem an einer ersten Gehäuseseite befestigten Elektromotor zum Antrieb der Pumpe, mit einem an einer zweiten, der ersten gegenüberliegenden Gehäuseseite versehenen Tank für eine hydraulische Flüssigkeit, z. B. Hydrauliköl, mit im Gehäuse vorzugsweise durch Bohrungen erzeugte Strömungswege für die hydraulische Flüssigkeit zum Zuführen dieser Flüssigkeit aus dem Tank an eine Pumpenkammer, zum Weiterleiten der von der Pumpe geförderten hydraulischen Flüssigkeit an einen am Gehäuse vorgesehenen Druckanschluß zum Anschließen des wenigstens einen Stellgliedes sowie zum Rückführen der hydraulischen Flüssigkeit von dem Druckanschluß in den Tank. The invention relates to a novel design of a hydraulic module for controlling at least one hydraulic actuator with a hydraulic pump in a housing, with an electric motor attached to a first housing side for driving the pump, with a tank provided on a second, opposite housing side for a hydraulic fluid, e.g. As hydraulic oil, with flow paths for the hydraulic fluid for supplying this fluid from the tank to a pump chamber, preferably generated by bores in the housing, for passing on the hydraulic fluid delivered by the pump to a pressure connection provided on the housing for connecting the at least one actuator and for Return the hydraulic fluid from the pressure port to the tank.

Over-pressure protection system

An over-pressure protection system includes a main body housing defining a main body chamber configured to receive a fluid therein, wherein the main body housing comprises a spring, the main body housing configurable in a collapsed configuration and an expanded configuration; and a pressure sensor configured to measure a fluid pressure of the fluid, the pressure sensor configurable in an activated mode and a deactivated mode; wherein, in the collapsed configuration, the spring biases main body housing inward at an intermediate point of the main body housing such that the main body housing defines a substantially hourglass shape.

Kinematic control in a hydraulic system

液压系统包括：泵；为泵供应液压油的油箱；与泵连接的马达；与注塑系统负载质量连接的液压触发器；与泵和触发器连接的液压阀，该阀用于将液压油引入触发器；通过下列方式使触发器加速或减速的控制器；若要使触发器减速，控制器通过以下方式控制马达和泵：通过以下任一方式进行操作：(i)维持压力，和(ii)减小出口节流处的压力；减小入口节流处的的压力，液压触发器入口节流处的压降速度比出口节流处的速度快得多；并且可通过调整泵的速度来减小液压触动器入口节流处的压力；若要使液压触发器加速，该控制器执行：通过以下任一方式进行操作：(i)维持压力，和(ii)增加出口节流处的压力；增加入口节流处的压力，液压触发器入口节流处的压力升高速度比出口节流处要快得多；并且可通过调整泵的速度来增加入口节流处的压力。

Hydraulic system

본 발명의 실시예에 따른 유압 시스템은 작동유를 토출하고 사판을 포함하는 가변 용량형 유압 펌프와, 상기 사판의 각도를 측정하는 사판 각도 센서와, 대경부와 소경부를 가지며 상기 대경부에 가해진 압력의 변화에 따라 상기 유압 펌프의 상기 사판을 움직이는 사판 구동 피스톤과, 상기 유압 펌프가 토출한 작동유의 일부를 상기 대경부로 공급하기 위한 사판 제어 유압 라인과, 상기 사판 제어 유압 라인 상에 설치되어 상기 대경부로 공급되거나 상기 대경부에서 배출되는 작동유의 유량을 제어하는 제어 밸브와, 상기 제어 밸브에 일측에 전달될 파일럿 압력을 생성하는 전자 비례 감압 밸브와, 조작 신호를 생성하는 조작 장치, 그리고 상기 조작 장치의 조작 신호와 상기 사판 각도 센서의 각도 정보에 따라 상기 전자 비례 감압 밸브를 제어하는 제어 장치를 포함한다.

Hydraulic system

Hydraulic control circuit of working machine

【課題】 通常制御をいかしつつ、リリーフ損失を低減して、エネルギー効率を向上させることのできる作業機械の油圧制御回路を提供する。 【解決手段】 この油圧制御回路は、油圧モータ２にコントロール弁３を介して作動油を供給する油圧ポンプ１と、メインリリーフ弁４と、コントローラ１５とを備え、このコントローラ１５は、さらに圧力センサ９で検出した油圧ポンプ１の吐出圧に基づく圧力フィードバック制御を行うように油圧ポンプ１にポンプ流量指令を発する第１指令部と、圧力センサ１３で検出したパイロット圧に基づくポジティブ制御を行うように油圧ポンプ１にポンプ流量指令を発する第２指令部と、油圧ポンプ１の吐出流量が小さくなる方のポンプ流量指令を選択する選択部とを備え、その選択されたポンプ流量指令で油圧ポンプ１を制御することにより、メインリリーフ弁４の開閉制御を行うように構成されている。 【選択図】 図１

Hydraulic circuit for construction machine

In the negative control of the split pump having one swash plate, the energy saving is achieved more than the development. The hydraulic circuit 1 of the construction machine for controlling the split pump 111 capable of reducing the discharge capacity according to the magnitude of the external signal pressure. This hydraulic circuit 1 is provided with a plurality of switching valves 118 and 124 for controlling a plurality of actuators 119, 120, 125, 126 and 127, And control valves 115 and 116 that can feed back to the split pump 111 as signal pressure. The hydraulic circuit 1 is configured such that the minimum pressure (external signal pressure 114) selected by the low-pressure selection valve 131 among the plurality of external signal pressures is fed back to the split pump 111. [

Hydraulic control circuit and method thereof

公开了一种用于减少由过载引起的发热和能量损耗的液压控制回路及其方法。本发明的液压控制回路包括：控制杆，用于根据操纵变量产生操纵信号；控制阀，其由先导信号压力驱动，用于控制自液压泵传递到致动器的受压流体的流量；位移传感器，用于检测控制阀的切换位置；泵压力传感器，用于检测施加到液压泵的泵压力；电子比例阀，用于向控制阀提供先导信号压力；以及，控制器，用于接收操纵信号，确定先导信号压力，向电子比例阀输出控制信号，接收来自位移传感器和泵压力传感器接收信号，并将该信号同预存的参考数据比较，并且向电子比例阀输出行程误差校正控制信号，用于调节控制阀的切换位置。

Hydraulic circuit for construction machinery

一個の斜板を有するスプリットポンプのネガティブ制御において、現状よりも省エネルギー化を図る。外部信号圧力の大きさに応じて吐出容量を小さくすることが出来るスプリットポンプ１１１を制御するための建設機械の油圧回路１である。この油圧回路１は、複数のアクチュエータ（１１９、１２０、１２５、１２６、１２７）を制御する複数の切換弁（１１８、１２４）を備え、２系統のセンタバイパス流量による背圧を外部信号圧力としてスプリットポンプ１１１へフィードバックすることができるコントロールバルブ（１１５、１１６）を有する。そして油圧回路１は、前記複数の外部信号圧力のうち低圧選択弁１３１によって選択された最小圧力（外部信号圧力１１４）がスプリットポンプ１１１にフィードバックされるように構成されている。

Hydraulic control system having over-pressure protection

A hydraulic control system for a machine is disclosed. The hydraulic control system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The hydraulic system may also have a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid directed to the actuator exceeds a first threshold pressure, and a controller in communication with the pump. The controller may be configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid directed to the actuator exceeds a second threshold pressure.

Hydraulic pump control system for construction machinery

A hydraulic pump control system provided in a construction machine such as an excavator is provided. According to the hydraulic pump control system, a loss of a flow rate is reduced by initially supplying hydraulic fluid as much as necessary from a hydraulic pump to a hydraulic motor in order to accelerate a swing movement of an upper frame against a lower traveling structure or to make an upper swing structure swing.

Hydraulic control system for working machine

Pressure oil energy recovery device of working machine

복귀 오일에 의해 구동되는 회생용 유압 모터와, 회생용 유압 모터와 기계적으로 연결된 제1 유압 펌프와, 유압 액추에이터를 구동하는 압유를 토출하는 제2 유압 펌프와, 제1 유압 펌프가 토출한 압유를 제2 유압 펌프가 토출한 압유에 합류시키는 합류관로와, 제1 유압 펌프의 압유의 유량을 조정 가능하게 하는 제1 조정기와, 제2 유압 펌프의 토출 유량을 조정 가능하게 하는 제2 조정기를 구비한 작업 기계의 압유 에너지 회생 장치에 있어서, 제어 장치는, 제2 유압 펌프만으로, 유압 액추에이터를 구동하는 경우의 비합류 시 펌프 유량을 산출하고, 제1 유압 펌프로부터의 압유의 유량이 비합류 시 펌프 유량 이하로 되도록 제1 조정기에 출력하는 제어 지령을 연산하는 제1 연산부와, 비합류 시 펌프 유량으로부터 제1 유압 펌프로부터의 압유의 유량을 감산하여 목표 펌프 유량을 산출하고, 목표 펌프 유량이 되도록 제2 조정기에 출력하는 제어 지령을 연산하는 제2 연산부를 구비하였다. A regenerative hydraulic motor driven by return oil, a first hydraulic pump mechanically connected to the regenerative hydraulic motor, a second hydraulic pump for discharging the hydraulic fluid for driving the hydraulic actuator, and a second hydraulic pump for discharging the hydraulic oil discharged from the first hydraulic pump A first regulator for adjusting the flow rate of the pressure oil of the first hydraulic pump, and a second regulator for adjusting the discharge flow rate of the second hydraulic pump. In the pressure oil energy regenerating device of one working machine, the control device calculates the pump flow rate at the time of non-confluence in the case of driving the hydraulic actuator with only the second hydraulic pump, and when the flow rate of the pressure oil from the first hydraulic pump is non- A first calculation unit for calculating a control command to be outputted to the first regulator so as to be equal to or less than the pump flow rate; and a second calculation unit for calculating a flow rate of the pressure oil from the first hydraulic pump, Acid calculates a target pump flow, followed by a second computing unit for computing a control command for outputting a second regulator such that the target pump flow.

Pressure overshooting preventing system for Electronic pump of Hydraulic system

본 발명은 유압시스템의 전자유압펌프의 압력 오버슈팅 방지 시스템에 관한 것이다. 본 발명에 따른 유압시스템의 전자유압펌프의 압력 오버슈팅 방지 시스템은, 유량지령을 가산(+)하고, 토출유량을 감산(-)하여 변위 유량(Delta Q)을 연산하여, 변위 유량(Delta Q)에 상응하는 제1 압력 지령을 생성하고, 토출유량에 상응하는 작동유 압력 값을 생성하고, 작동유 압력 값의 증가 기울기를 제한하도록 제한압력지령을 발생시키며, 유량지령의 제1변화율과 토출유량의 제2변화율에 근거하여 스톨(stall)을 판단하며, 스톨로 판단되면 제한압력지령을 제2 압력 지령으로 설정하여, 제1 압력지령과 제2 압력지령 중에 작은 값을 최종 압력지령으로 선택하여 전자비례제어 밸브를 제어하도록 하여 전자유압펌프의 오버슈팅을 저감하도록 하는 것이다. The present invention relates to a pressure overshooting prevention system for an electrohydraulic pump of a hydraulic system. In the hydraulic overheating prevention system of the hydraulic pump according to the present invention, the flow rate command is added (+), the discharge flow rate is subtracted (-) to calculate the displacement flow rate Delta Q, ), Generates an operating oil pressure value corresponding to the discharge flow rate, generates a restricted pressure command to limit the increase slope of the operating oil pressure value, and generates the first variation rate of the flow rate command and the discharge flow rate The stall is determined based on the second rate of change. If it is determined that the stall is stalled, the limit pressure command is set to the second pressure command, and a smaller value of the first pressure command and the second pressure command is selected as the final pressure command, The proportional control valve is controlled so as to reduce overshooting of the electrohydraulic pump.

Hydraulic control device

一种油压控制装置，配备有调压阀、信号压发生用阀和蓄压器，所述调压阀将由油泵产生的油压调节到在控制回路中要求的工作油压，所述信号压发生用阀将信号压供应给所述调压阀，所述信号压决定应由该调压阀设定的油压，所述蓄压器蓄积应供应给所述控制回路的工作油压，所述油压控制装置配备有：蓄压器控制阀，所述蓄压器控制阀，设置在所述蓄压器与控制回路之间，并且通过开闭动作，使所述蓄压器与所述控制回路连通，并且使所述蓄压器相对于所述控制回路断开；信号压用连通通路，所述信号压连通通路将由所述信号压发生用阀产生的所述信号压供应给所述蓄压器控制阀的信号压端口，根据该信号压使所述蓄压器控制阀进行开闭动作。

Control device for a hydraulic pump of construction machinery

本发明公开一种用于安装在挖掘机或其他施工机械上的液压泵的负控制型控制装置。根据本发明的用于施工机械液压泵的控制装置包括：蓄能器，其用于存储控制信号压力；电磁阀，其用于在根据提供的控制信号切换过程中，提供信号压力或来自蓄能器的负压力；以及控制杆闭合装置，其用于根据操作者的控制打开或关闭提供给电磁阀的控制信号，其中，在发动机的启动过程中，补偿由于电磁阀的切换而由蓄能器提供的工作流体产生的负压力，并且筛板的旋转角保持在最小流量位置。

Work machine

【課題】油圧アクチュエータに対する微操作時における操作性と省エネルギを両立させることができる作業機械を提供する。 【解決手段】作業機械は、油圧ポンプ２２からの圧油により駆動する油圧アクチュエータ２３、２４と、センタバイパスライン２９上に配置され油圧アクチュエータ２３、２４に供給される圧油の流れを制御するオープンセンタ型の方向制御弁２５、２６と、センタバイパスライン２９上の方向制御弁２６と作動油タンク２８の間に配置されたＣＢカット弁３１と、ＣＢカット弁３１の開度を制御する機体コントローラ６０とを備える。機体コントローラ６０は、油圧アクチュエータ２３、２４に対する操作が微操作の領域を示す所定の範囲内にある微操作の状態であって且つ当該微操作の状態が所定の期間を超えて継続されている場合ＣＢカット弁３１の開度を絞り、それ以外の場合ＣＢカット弁３１を全開にする。 【選択図】 図２

Hydraulic control circuit and method thereof

본 발명은 피드백 제어에 의해 제어밸브의 절환위치를 보정하여 유압펌프 측에 과부하가 작용하지 않도록 함으로써 과부하에 의한 발열과 에너지 손실을 줄이도록 한 유압제어회로 및 유압제어방법에 관한 것이다. 본 발명에 따른 유압제어회로는 조작신호를 발생하는 조작레버와, 파일럿 신호압에 의해 작동되어 유압펌프에서 토출되어 액추에이터에 공급되는 압유의 흐름을 제어하는 제어밸브와, 제어밸브의 절환위치를 검출하는 변위센서와, 유압펌프 측에 작용하는 펌프압력을 검출하는 펌프압력센서와, 제어밸브에 파일럿 신호압을 공급하는 전자비례밸브와, 조작신호를 입력받아 파일럿 신호압을 결정하여 제어신호를 전자비례밸브에 출력하며 변위센서와 펌프압력센서의 신호를 입력받아 저장된 기준데이터와 비교하여 제어밸브의 절환위치를 보정하기 위한 제어신호를 전자비례밸브에 출력하는 제어부를 포함한다. 제어밸브, 스풀스틱, 피드백제어, 스트로크센서, 스풀변위, 과부하

Rotation device controlling device, has complimentary pistons controlled by control signals to control adjusting time of piston and brake valves with opening sections adjusted with respect to control signals, when motor brake by inversion

Commande hydraulique, notamment commande de dispositif de rotation d'une machine de travail, comportant un consommateur moteur entraîné par une pompe à débit de refoulement réglable dans un circuit fermé, le débit volumique de refoulement de la pompe étant réglable par une installation de réglage comprenant un piston de réglage muni d'une première et d'une seconde chambre pression de commande reliées par une soupape de réglage commandée en fonction des signaux de commande à une source de pression de commande ou être déchargées vers un réservoir, avec au moins une vanne de frein sollicitée par les signaux de commande servant à commander le temps de réglage du piston de réglage. Au freinage du consommateur (2) par inversion, on règle la section d'ouverture de la vanne de frein (25a, 25b) en fonction du signal de commande (Y, Z).

Method of controlling the flow rate of a variable capacity hydraulic pump for a construction apparatus

유압펌프의 토출 압력이 변경되는 경우에도 사용자에 의한 조작레버의 조작량에 비례하여 토출 유량을 제어하기 위한 유압펌프 유량 제어방법을 개시한다. 본 발명에 따른 건설기계용 가변용량형 유압펌프 유량 제어방법에 있어서, 사용자에 의한 조작레버의 조작량에 따라 유압펌프에 요구되는 유량을 연산하는 제1단계와, 토출 압력 검출센서에 의해 검출된 압력 대비 미리 설정된 유압펌프의 특정 마력 또는 토오크를 초과하지않는 최대 토출 가능한 유량을 연산하는 제2단계와, 제2단계에서 설정된 최대 토출 가능한 유량값 범위내에서 조작레버의 조작량에 따라 비례적으로 유압펌프의 토출 유량을 제어하는 제3단계를 포함하는 것을 특징으로 하는 유압펌프 유량 제어방법을 제공한다. Disclosed is a hydraulic pump flow rate control method for controlling a discharge flow rate in proportion to an operation amount of an operation lever by a user even when a discharge pressure of a hydraulic pump is changed. In the variable capacity hydraulic pump flow rate control method for a construction machine according to the present invention, A first step of calculating a flow rate required for the hydraulic pump according to an operation amount of the operation lever by a user, A second step of calculating a maximum dischargeable flow rate not exceeding a predetermined horsepower or torque of a predetermined hydraulic pump relative to a pressure detected by the discharge pressure detecting sensor, And a third step of controlling the discharge flow rate of the hydraulic pump proportionally in accordance with the operation amount of the operation lever within the range of the maximum dischargeable flow amount set in the second step.

Engine lug-down suppressing device for hydraulic work machinery

본 발명의 과제는 유압 액추에이터에 정지 상태로부터 급한 동작을 행하게 할 때의 유압 액추에이터의 조작성의 저하가 억제되는 유압 작업 기계의 엔진 러그 다운 억제 장치를 제공하는 것이다. 가변 용량형 유압 펌프(23)의 틸팅 제어부(25)로의 파일럿 압력이 전자기 밸브(54)에 의해 제어된다. 컨트롤러(55)는 입력 장치(40)로부터의 목표 회전수 신호에 따라서 전자기 밸브(54)의 제어를 행한다. 이 제어는 조작 레버 장치(34)에 의해 생성된 파일럿 압력을 검지 장치(51)가 검지하고 있지 않을 때와 검지했을 때에는 다르고, 검지하지 않을 때의 펌프 흡수 토크가, 모든 목표 엔진 회전수에 있어서, 검지했을 때의 펌프 흡수 토크 이하의 범위 내에 있는 동시에, 목표 엔진 회전수가 높을수록, 검지했을 때의 펌프 흡수 토크에 근접하도록 되어 있다. An object of the present invention is to provide an engine lag-down suppressing device for a hydraulic working machine in which a deterioration in operability of a hydraulic actuator when a hydraulic actuator is urgently operated from a stationary state is suppressed. The pilot pressure to the tilting control unit 25 of the variable displacement hydraulic pump 23 is controlled by the electromagnetic valve 54. [ The controller 55 controls the electromagnetic valve 54 in accordance with the target number of revolutions signal from the input device 40. This control is different when the detection device 51 detects and does not detect the pilot pressure generated by the operation lever device 34. The pump absorption torque when the detection is not detected is different for all target engine speeds Is within a range equal to or smaller than the pump absorption torque at the time of detection, and the higher the target engine speed is, the closer to the pump absorption torque at the time of detection.

The engine of engineering machinery and the integration control device and its method of hydraulic pump

本发明提供工程机械的发动机及液压泵的统合控制装置及其方法。在具备发动机、被所述发动机驱动的液压泵、用于控制从所述液压泵排出的工作油的控制阀以及利用来自所述控制阀的工作油而运转的执行器的工程机械的发动机系统中，工程机械的发动机及液压泵的统合控制装置包括：动力模式判断部，其利用表示所述液压泵的作业负载的第一状态值及表示作业者所要求的作业速度的第二状态值的函数，计算自动模式变更指数，从而决定所述液压泵的动力模式的变更与否；泵动力设定部，其根据所述动力模式的变更与否而设定所述液压泵的动力模式；以及发动机转数设定部，其根据所述动力模式的变更与否而设定所述发动机的转数。

Control valve for power steering

The valve has a valve slide (14) movably accommodated in a guide (15) along an axis (16) for acting upon a side by a hydraulic liquid and on an opposite side with defined supporting forces. An opening structure (23) is provided at one of the slide and the guide. A movement of the slide relative to the guide effects a change of a free passage area of the structure that is uncovered by a cover, where the liquid flows from an inlet (9) through the area to an outlet (11). The structure has a defined shape such that the area is linearly independent on the movement of the slide.

Work machine

Hydraulic circuit, and combination valve used in same hydraulic circuit

The invention relates to a hydraulic circuit which makes it possible to perform maintenance on a stack valve of the hydraulic circuit and to perform various functions such as flushing of the circuit and a trial run in parallel with the maintenance, and relates to a composite valve used in the hydraulic circuit. In the hydraulic circuit, the composite valve is interposed between the stack valve and a hydraulic power supplier and between the stack valve and a multifunction valve coupled to a hydraulic device. The composite valve includes: stop valves opening/closing communication between the hydraulic power supplier and the stack valve and stop valves opening/closing communication between the stack valve and the multifunction valve; and bypass circuits including stop valves opening/closing communication between the hydraulic power supplier and the multifunction valve, the bypass circuits provided closer to the hydraulic power supplier than the stop valves. This structure makes it possible to perform repair, checking, and/or maintenance on the hydraulic power supplier and the stack valve; flushing; and repair, checking, maintenance, and/or a trial run of the hydraulic device, simultaneously. The composite valve has uniform circuit configurations, which facilitates production of the valve.

Hydraulic system for construction machine, provided with protection device

Hydraulic control device for forklift

A hydraulic control device for a forklift includes a hydraulic pump, a single electric motor for driving the hydraulic pump, an outflow control mechanism provided between a lift cylinder and the hydraulic pump, a flow control valve provided between the outflow control mechanism and a draining portion, and a controller. When a lowering operation of a fork and either forward or rearward mast tilting operations of a mast are performed at the same time, the controller controls the electric motor based on a target speed of the hydraulic pump. The flow control valve controls the flow rate of hydraulic fluid from the lift cylinder to the hydraulic pump and the flow rate from the lift cylinder to the draining portion in accordance with the difference between the actual rotation speed of the hydraulic pump and the target rotation speed of the hydraulic pump.

Kinematic control in a hydraulic system

A hydraulic system is provided, having a pump, operably connected to a motor. It also comprises a controller-driven hydraulic actuator, operably connected to the pump and a hydraulic valve, operable to direct hydraulic fluid to and from either a rod side or a cylinder side of the hydraulic actuator. Rod and cylinder side pressures are pre-defined based on the instantaneous acceleration or deceleration required. Decelerating the hydraulic actuator could involve maintaining the current pressure in the meter-out side of the hydraulic actuator and decreasing the current pressure in the meter-in side by varying the speed of the pump. Deceleration of the hydraulic actuator could also include decreasing pressure on the meter-in side of the hydraulic actuator at a higher rate than on the meter-out side. Acceleration is achieved using a similar approach.

Digital hydraulic system

一种增压介质系统及其方法，包括：至少一个促动器(23)或促动器单元，通过它能够产生作用在所述负载上的合力(Fcyl)；至少一个工作腔(19，20，21，22)，基于排量原理进行操作，并位于所述促动器或促动器单元中；至少一个高压充压管路(HPi，HPia)，为液压动力源；至少一个低压充压管路(LPi，LPia)，为液压动力源；控制管路(40)，通过所述控制管路(40)，能够将至少一个所述高压充压管路(HPi，HPia)和至少一个所述低压的充压管路(LPi，LPia)依次耦接至至少一个所述工作腔(19，20，21，22)，其中每个所述工作腔(10，20，21，22)能够产生与将被耦接至所述工作腔的充压管路(HPi，HPia，LPi，LPia)的压强相应的分力(FA，FB，FC，FD)，并且每个分力单独或与由所述促动器或促动器单元的其它工作腔产生的分力相组合来产生至少一个所述合力。所述促动器单元例如为回转装置或旋转装置。所述系统在控制管路的控制中利用了控制器。

Hydraulic control circuit for working machine

为了实现减少燃料消耗和提高可操作性，提出了一种液压控制回路，该液压控制回路设置有通过从液压泵的排出管线分支并且延伸到油箱而形成的旁通油路和具有可变打开面积以控制旁通油路的流量的旁通阀，并且通过旁通阀的打开面积控制精确地执行泵压力控制，而不受每次的条件影响。液压控制回路被配置为执行旁通阀(11)的打开面积的闭环控制，使得在操作杆(7)的非操作期间，泵压力维持在设定压力，另一方面，在操作杆(7)的操作期间，执行开环控制以根据操作杆的操作输入减小旁通阀(11)的打开面积，并且进一步被配置为基于闭环控制期间旁通阀(11)的打开面积纠正开环控制期间操作杆的操作输入与旁通阀(11)的打开面积之间的对应关系。

Work machine

A work machine comprises a variable-capacity pump (2), an actuator (5) driven by oil discharged by the pump (2), an open-center actuator flow rate control valve (4) for controlling the rate at which hydraulic oil flows to the actuator (5), a bleed-off pipe (8a) for connecting the actuator flow rate control valve (4) to a tank (6), a bleed-off flow rate control valve (8) disposed in the bleed-off pipe (8a), an operating device (3) for directing the operation of the actuator (5), a bleed-off controller (14) for controlling the opening degree of the bleed-off flow rate control valve (8) in accordance with the manipulated variable of the operating device (3), and a pump controller (15) for controlling the pump flow rate by correcting a reference pump flow rate, which corresponds to the manipulated variable of the operating device (3), in accordance with the opening degree of the bleed-off flow rate control valve (8). Provided thereby is a work machine capable of conserving energy while suppressing the incidence of any adverse sensation related to operation.

Charge bypass system for engine start

The present invention provides an engine start system in a vehicle. The engine start system includes an engine and a charge system. The vehicle also includes an engine speed sensor for measuring a speed of the engine. The charge system is coupled to the engine and includes a charge pump. The vehicle further includes a control unit and a temperature sensor for sensing a temperature of fluid in the charge system. The temperature sensor is electrically coupled to the control unit. A bypass system is fluidly coupled to the charge system and includes a valve and a solenoid. The solenoid is electrically coupled to the control unit such that the control unit energizes the solenoid to control the valve in response to the speed measured by the speed sensor and the temperature sensed by the temperature sensor.

A kind of symmetrical hydraulic cylinder series connection propulsion system of shield excavation machine double piston-rod

一种盾构掘进机双活塞杆对称液压油缸串联连接推进系统主要由若干个结构相同的分区推进系统组成，每个分区推进系统包括一个伺服电机、一个定量泵、一个安全阀及若干个结构相同的双活塞杆对称液压油缸等，伺服电机的输出轴与定量泵的输入轴刚性联接，定量泵的左端油口与第一液压油缸的左端油口、安全阀的进油口连接，右端油口与第三液压油缸的右端油口连接，第一、第二、第三液压油缸之间的油路串联连接，本发明各分区推进液压油缸易于实现同步控制,各推进系统的液压油路相互独立，既可独立控制，又能协调控制，增加了系统控制的灵活性；采用泵控缸的直驱式容积调速系统，系统节能显著。

Construction machinery

Working vehicle

고정 용량형 유압 펌프에 기인하는 엔진의 부하를 저감시켜, 엔진 스톨(stall)을 방지하는 효과를 높이는 것을 과제로 한다. 엔진(9)으로부터의 동력에 의해 구동하는 고정 용량형 유압 펌프(23)와, 고정 용량형 유압 펌프(23)로부터 압송된 작동유로 구동하는 작업용 유압 액추에이터(7·13·14·15·18)를 구비하는 작업 차량(1)에 있어서, 고정 용량형 유압 펌프(23)로부터의 작동유압을 변경하는 압력 변경 수단(43)이 마련되어, 엔진(9)의 부하가 커져, 엔진(9)의 실회전수(N)가 설정 회전수(Ns)보다 작아지면, 엔진(9)의 실회전수(N)와 설정 회전수(Ns)의 편차(e)에 따라 압력 변경 수단(43)이 작동해 고정 용량형 유압 펌프(23)로부터의 작동유압이 변경되는 선회 작업차(1)이다. There is a problem in that the load of the engine caused by the fixed displacement type hydraulic pump is reduced and the effect of preventing stalling of the engine is enhanced. A fixed capacity type hydraulic pump 23 driven by the power from the engine 9 and working hydraulic actuators 7, 13, 14, 15, 18 driven by working oil pumped from the fixed capacity type hydraulic pump 23, A pressure changing means 43 for changing the working oil pressure from the fixed displacement hydraulic pump 23 is provided in the working vehicle 1 having the engine 9, The pressure changing means 43 operates according to the deviation e between the actual rotation speed N of the engine 9 and the set rotation speed Ns when the rotation speed N becomes smaller than the set rotation speed Ns And the working oil pressure from the fixed displacement hydraulic pump 23 is changed.

Regeneration device, hydraulic drive system provided with regeneration device, and control device for hydraulic drive system

再生装置具备：控制从缸的一方的端口排出的工作液的流量的再生阀；允许从再生阀向缸的另一方的端口再生工作液的流动，且阻止其反方向的流动的逆流防止阀；和能控制从再生阀输出的工作液排出至罐的流量的排出阀，所述再生阀与所述排出阀独立地控制流量。

The hydraulic control device of fork truck

叉车的液压控制装置具备：液压泵；驱动液压泵的单一的电动机；被配设于起重缸和液压泵之间的流出控制机构；被配设于流出控制机构和排泄部之间的流量控制阀；和控制部。在货叉的下降动作和桅杆的前倾动作或后倾动作中任意一方的动作同时进行的情况下，控制部根据为了以与升降指示部件的操作量或倾转指示部件的操作量对应的指示速度进行动作所需的液压泵的目标转速来控制电动机。流量控制阀根据为了以与升降指示部件的操作量对应的指示速度进行所述下降动作所需的液压泵的目标转速和液压泵的实际转速之间的差，来控制从起重缸流向液压泵的工作油的流量和从起重缸流向排泄部的流量。

Hydraulic system and method of controlling hydraulic actuator

The invention relates to a hydraulic system, a mobile mining machine and to a method of controlling a hydraulic actuator. The hydraulic system comprises two hydraulic pumps (PI, P2) for generating hydraulic power for a hydraulic actuator (HA). The pumps are powered by means of a common electric motor (M). Operation of the actuator is controlled by controlling speed and direction of the motor, whereby hydraulic lines (19a, 19b) may be without actively controlled control valves.

Hydraulic circuit for construction machine

本发明提供一种建筑机械的液压回路(1)，能在具有一个斜板的分流泵的负控制中，比现有技术更节能。建筑机械的液压回路(1)用于控制分流泵(111)，该分流泵(111)能根据外部信号压力的大小使排出容量减小。该液压回路(1)具有多个切换阀(118、124)，该多个切换阀(118、124)用于控制多个液压驱动机构(119、120、125、126、127)，并且该液压回路(1)具有控制阀(115、116)，该控制阀(115、116)能把由两个系统的中路旁通流量产生的背压作为外部信号压力，向分流泵(111)反馈。并且液压回路(1)把由低压选择阀(131)选择的所述多个外部信号压力中的最小压力(外部信号压力(114))向分流泵(111)反馈。

Hydraulic circuit, and combination valve used in same hydraulic circuit

Low noise hydraulic power unit for an auto hoist lift

A hydraulic power unit for an auto-hoist lift having improved noise characteristics and a more compact design. A motor (14) and pump (16) driving the power unit are located inside a hydraulic fluid reservoir (12) to thereby reduce the amount of noise reaching the immediate vicinity of the power unit. The motor (14) and pump (16) are submerged in the hydraulic fluid (18) to advantageously utilize the hydraulic fluid to cool the motor. The power unit may further incorporate a delay valve (40) for reducing the start-up torque load on the motor, thereby allowing the motor to be sized for normal operating requirements rather than oversized for start-up requirements.

Pressure overshooting prevention system for electronic hydraulic pump in hydraulic system

The present invention relates to a pressure overshooting prevention system for an electronic hydraulic pump in a hydraulic system. A flow command is added (+) and a discharge flow rate is subtracted (-) to calculate a displacement flow rate (Delta Q) and generate a first pressure command corresponding to the displacement flow rate (Delta Q). A working fluid pressure value corresponding to the discharge flow rate is generated. A limit pressure command is generated so as to limit an increased gradient for a working fluid pressure value. A stall is determined based on a first rate of change of the flow command and a second rate of change of the discharge flow rate. When a stall is determined, the limit pressure command is set as a second pressure command. The smaller value of the first pressure command and the second pressure command is selected as a final pressure command so as to control an electronic proportional control valve and reduce overshooting of the electronic hydraulic pump.

Hydraulic power steering, has regulating pin with first control elements for controlling fluid flow in relation to steering movement, second for regulating emergency operation in event of

The arrangement has a valve device (1) with a variable aperture (2) for controlling a fluid flow to a hydraulic cylinder pressure chamber or bypass regulator depending on a steering movement. The aperture has a regulating pin (3) regulated by an electromagnet and a choke. The pin has a first control element (13) for controlling the fluid flow in relation to the steering movement and a second (14) for regulating emergency operation for fault states.

Work machine control system, work machine, and work machine control method

A control system for a work machine includes a plurality of hydraulic pumps that discharge hydraulic oil, a hydraulic cylinder that moves a working equipment element, a plurality of flow rate control valves that are respectively connected to the hydraulic pumps and adjust a flow rate of the hydraulic oil supplied to the hydraulic cylinder, a plurality of supply flow paths respectively connected to the of flow rate control valves, a meter-in flow path that connects a collective part of the supply flow paths and an inlet of the hydraulic oil in the hydraulic cylinder, a plurality of discharge flow paths respectively connected to the flow rate control valves, a meter-out flow path that connects a collective part of the discharge flow paths and an outlet of the hydraulic oil in the hydraulic cylinder, and a throttle disposed in the meter-out flow path.

Fittings for hydraulic operation

本发明提出的一种液压操作配件带有一台伺服马达(1)、一个液压控制系统、一台在该液压系统中的泵(3)和一台该泵(3)传动用的电动机(4)，它们一起组合在一个结构单元中。这种配件可减少供电的结构费用。为此，泵(3)作成调节泵。

Kinematic control in a hydraulic system

Hydraulic system comprising: pump; reservoir to supply pump with hydraulic fluid; motor connected to pump; hydraulic actuator connected to load mass of molding system; hydraulic valve connected with pump and actuator, valve to direct fluid to actuator; controller to alternatively accelerate and decelerate actuator by: for decelerating actuator, controller to control motor and pump by: any one of: (i) maintaining pressure, and (ii) decreasing pressure in meter-out side of actuator; decreasing pressure on meter-in side of actuator, actuator decreasing pressure on meter-in side more rapidly than on meter-out side; and decreasing pressure on meter-in side is achieved by adjusting speed in pump; for accelerating actuator, controller performs: any one of: (i) maintaining pressure, and (ii) increasing pressure in meter-out side; increasing pressure on meter-in side, actuator increasing pressure on meter-in side more rapidly than on meter-out side; and increasing pressure on meter-in side is achieved by adjusting speed in pump.

Hydraulic valve and hydraulic circuit with such a hydraulic valve

Die Erfindung betrifft ein Hydraulikventil (18) mit einem Ventilgehäuse, einem Ventilsitz und einem im Ventilgehäuse beweglichen Ventilelement, in dem ein Kanal (30) von einer ersten Stirnseite des Ventilelements zu einer entgegengesetzten zweiten Stirnseite des Ventilelements ausgebildet ist, wobei die erste Stirnseite mit einem Systemdruck in Ricch eine Feder (36) in entgegengesetzter Richtung vom Ventilsitz weg beaufschlagt ist. Des weiteren betrifft die Erfindung einen Hydraulikkreislauf für ein aktives Fahrwerkstabilisierungssystem, mit einem solchen Hydraulikventil (18) und einer hydraulischen Steuereinheit (12), wobei das Hydraulikventil (18) parallel zur hydraulischen Steuereinheit (12) zwischen eine Pumpe (8) und ein druckloses Reservoir (16) geschaltet ist. The invention relates to a hydraulic valve (18) having a valve housing, a valve seat and a valve element movable in the valve element, in which a channel (30) is formed from a first end side of the valve element to an opposite second end side of the valve element, wherein the first end face with a System pressure in Ricch a spring (36) is acted upon in the opposite direction from the valve seat away. Furthermore, the invention relates to a hydraulic circuit for an active chassis stabilization system, with such a hydraulic valve (18) and a hydraulic control unit (12), wherein the hydraulic valve (18) parallel to the hydraulic control unit (12) between a pump (8) and a non-pressurized reservoir (16) is switched.

Method for operating a hydraulic drive

Die Erfindung betrifft ein Verfahren zum Betreiben eines hydraulischen Antriebs (100), der einen hydraulischen Verbraucher (130) mit einem positionierbaren Kolben in einem Zylinder umfasst, der an einem Anschluss über eine drehzahlvariable Pumpe (110) und an einem anderen Anschluss (B) über ein Proportionalventil (140) mit einem Tank verbunden ist, wobei eine Position (x) des Kolbens unter Verwendung einer modellbasierten Regelung geregelt wird, in der eine Drehzahl (n) der Pumpe (110) als Stellgröße verwendet wird, und in der eine Stellung (y) des Proportionalventils (140) vorgegeben wird. The invention relates to a method for operating a hydraulic drive (100), which comprises a hydraulic consumer (130) with a positionable piston in a cylinder, which is connected to a connection via a variable-speed pump (110) and to another connection (B). a proportional valve (140) is connected to a tank, wherein a position (x) of the piston is controlled using a model-based control, in which a speed (n) of the pump (110) is used as a manipulated variable, and in which a position ( y) of the proportional valve (140).

Hydraulic drive system for construction machinery

Lift device with variable speed actuation

A lift device of the type appended to a vehicle such as a tailgate lift or wheelchair lift. The lift includes a platform (12) movable between a lower or ground position (G) , an upper or load position (E) and a stowed position (S). The platform (12) assumes a horizontal orientation in the ground (G) and load (E) positions and is pivotable to a vertical orientation when stowed for vehicle movement. The platform (12) is connected to a lever arm assembly(13) and further includes hydraulic apparatus (14) to move the platform (12) between ground (G), load (E) and stowed (S) positions. The hydraulic apparatus (14) is actuated by a pump and motor assembly (36) which includes an electric motor (42) for actuation of the pump (4O) and hydraulic apparatus (14). By varying the speed of the motor (42), the speed of the platform (12) between various platform orientations can be varied.

Hydraulic drive

In a hydraulic drive of a tool, a piston is adapted to be acted upon by a pump via a pressure limiting seat valve and a parallel switching seat valve of a valve arrangement. A restriction is provided in a pressure line upstream of the pressure limiting seat valve which is connected to a tank on the flow-off side. A drain line leads from a working chamber of the piston via the switching seat valve to the tank. A closing side is adapted to be acted upon by pressure and an opening side is adapted to be acted upon by a force generated when the pressure limiting seat valve responds. The pump is adapted to be switched off when the maximum operating pressure has been reached, so that the piston will execute a return stroke. A pressure-increasing restriction is provided on the flow-off side of the pressure limiting seat valve.

Control device for a hydraulic pump of construction machinery

굴삭기 등의 건설기계에 장착되는 네가티브 제어방식의 유압펌프 제어장치를 개시한다. 본 발명에 따른 건설기계의 유압펌프 제어장치에 있어서, 제어 신호압력을 저장하는 축압기와, 제어신호 인가에 따라 절환시 축압기로부터의 신호압력과 네가티브 압력중 어느 하나를 레귤레이터에 공급하는 솔레노이드밸브와, 운전자의 조작에 따라 솔레노이드밸브에 인가되는 제어신호를 온,오프시키는 조작레버 잠금수단을 포함하여, 엔진 시동시 솔레노이드밸브의 절환으로 축압기로부터 공급되는 작동유에 의해 네가티브 압력을 보상하여 유압펌프의 사판 경전각을 최소 용량으로 유지하는 것을 특징으로 하는 유압펌프 제어장치를 제공한다.

Hydraulic device for driving oil well pump

　油井ポンプ駆動用油圧装置において、少なくとも双方向可変容量ピストンポンプと吐出量検出部と吐出圧検出部と比例電磁制御弁とをポンプ本体としての同一ハウジング内に単一ユニット構造で備え、ポンプ本体に、ハウジング側面に設けられて外部パイロット油圧回路のポンプ吐出流路が接続される接続部と、前記ピストンポンプの吐出流路と比例電磁制御弁との間のパイロット流路に前記接続部から外部パイロット圧を導入する第２パイロット流路とを備え、該第２パイロット流路上に、前記ピストンポンプの吐出圧が予め定められた圧力以下となった時点で機械的に外部パイロット圧の供給を遮断する手段を更に備えた。これにより電気的制御に頼ることなく且つコスト高を招くことのない簡便な構成で、制御系が停止してもキャビテーション発生を回避できる油井ポンプ駆動用油圧装置の提供が可能となった。

Kinematic control in a hydraulic system

A hydraulic system is provided, having a pump, operably connected to a motor. It also comprises a controller-driven hydraulic actuator, operably connected to the pump and a hydraulic valve, operable to direct hydraulic fluid to and from either a rod side or a cylinder side of the hydraulic actuator. Rod and cylinder side pressures are pre-defined based on the instantaneous acceleration or deceleration required. Decelerating the hydraulic actuator could involve maintaining the current pressure in the meter-out side of the hydraulic actuator and decreasing the current pressure in the meter-in side by varying the speed of the pump. Deceleration of the hydraulic actuator could also include decreasing pressure on the meter-in side of the hydraulic actuator at a higher rate than on the meter-out side. Acceleration is achieved using a similar approach.