Verfahren und anordnung zur messdatenerfassung mit überprüfen der verkabelung

FOR the MEASUREMENT DATA RECORDING WITH the EXAMINING of the WIRING the gegenständliche invention a procedure for examining the wiring in an arrangement for the measurement data recording and an arrangement concerns PROCEDURES AND ARRANGEMENT for the measurement data recording, whereby by a number of measuring sensors over measuring sensor lines a measuring sensor signal is sent in each case to a measuring amplifier and the measuring amplifiers over measuring signal lines in each case a measuring signal to a measuring data evaluation unit senden.

In test systems of vehicles and/or vehicle components, like a Rollenprüfstand for vehicles or a test stand for engines, drive strands, transmission, etc., are e.g. seized a row of measuring signals and processed in superordinate units, like e.g. a test stand software. In such arrangements for measurement data recording the Messkette usually exists of several measuring sensors, like e.g. piezoelectric or resistive pressure sensors, sensors for oscillation, Kraft, Drehmoment, Temperatur, Abgasanalyse, etc., which is connected with a measuring amplifier in each case. The individual measuring amplifiers are thereby with a measuring data evaluation unit verbunden.

In on test stands, in particular on engine test stands, frequently used indicating technology, all desired engine characteristic values - among them characteristic values and parameters of the combustion engine which can be examined (e.g. this-blaze petrol engine), and/or its operational behaviour (e.g. during a duty cycle) are understood - are seized and/or from measured values computed. To the indicating arrangement belonged also a signal amplifier (measuring amplifier), which a sensor signal for a further use accordingly processes, e.g. strengthens, conditionedly, filters and/or digitizes. With certain sensors, like the piezoelectric cylinder pressure absorbers particularly important for the indicating technology, as signal amplifier generally a load amplifier is e.g. used. In addition, e.g. strain gauges, piezoresisitive pressure absorbers, impact sound knocking sensors, sensors for Schallund ultrasonic mission analysis, can lonenstromsonden flaming photosensors, sensors for needle stroke, Ventilhub or piston stroke, etc., with which ever associated signal amplifiers are used. Depending upon kind of the sensors the different well-known signal amplifier circuits can be used. For piezoelectric sensors, which uA for the measurement of pressure, Kraft, Drehmoment, and acceleration are used, the principle of the load amplifier (in the closer sense) has itself opposite electrometer amplifiers and Transimpedanzverstärkern (e.g.

Spannungs-Strombzw. Load current converter) to a large extent interspersed. Also for load amplifiers in the closer sense are different circuits admits become. In indicating equipment downstream, i.e. equipment with sign-blaze to time-based triggering of the individual points of gate time, become then the measuring signals supplied by the signal amplifiers weiterverarbeitet.

As measuring amplifiers thereby also frequently more-canal devices are used, whereby in each measuring channel its own signal amplifier is intended. Each individual channel becomes thereby for the following description of the invention as individual measuring amplifiers angesehen.

In arrangements with many sensors, how it is to be usually found on test stands, it is quite a difficulty this abundance at sensors, amplifiers, indicating devices, to administer etc. and guarantee that the configuration (sensor, wiring, etc.) of the individual Messketten and the entire arrangement is error free for measurement data recording, there it otherwise to incorrect measurements or measuring losses, etc. to come can. In an arrangement for measurement data recording an appropriate wiring is necessary between the individual measuring sensors and measuring amplifiers and between the individual measuring amplifiers and measuring data evaluation unit. By the necessary wiring which can be made manually, open however a multiplicity of possible sources of error, e.g. by a missing cable, a defective cable or by a mistake of individual cables, thus a FehlanPatentamt conclusion. Such errors which can be attributed to the cables are beyond that, particularly in an arrangement with many sensors to find extremely difficult. In order to achieve a high measure to automation and an associated error reduction, it is desirable, if the configuration of the measuring instrument can be automatically recognized to a high measure and also verified. In addition there is also appropriate software to administer around the configuration of the measuring instrument and document. Possible errors in the wiring do not leave themselves however with such a administrative software without further measures erkennen.

It was already suggested to planning at the sensor or in the plug of the sensor cable a memory unit in which determined, the sensor data concerned, like e.g.

Calibration data, to be stored and by an evaluation unit be queried können.

Such an arrangement is revealed e.g. in the EP 1,302,755 B1. Likewise it is from the EP 1,300,657 a2 already admits in the sensor only one sensor identification to deposit and the sensor-relevant data in the sensor assigned a memory unit to deposit, of where the sensor-relevant data can be queried after identification the sensor over the sensor identification which can be queried. Thus the sensor could be identified and over the sensor-relevant data a Parametrierung of the configuration, e.g. the amplifier, be made, the wiring between the components of the measuring instrument, in particular between the measuring amplifiers and the measuring data evaluation unit, cannot thereby however not examined werden.

It is from there a task of the gegenständlichen invention to indicate an arrangement and a procedure for the measurement data recording with which the wiring between measuring amplifiers and measuring data evaluation unit can be examined simply and automatically for errors, with more appropriate associated increase of the working reliability, shortening of error search time and simplification of the Bedienung.

This task is solved according to invention by the fact that the measuring data evaluation unit sends an inquiry signal over a query line to the measuring amplifiers and the measuring amplifiers as answer to the inquiry signal over the measuring signal lines which can be examined to the measuring data evaluation unit sends an answer signal. By this feedback of the measuring amplifiers to the measuring data evaluation unit over the measuring signal lines it can be examined whether the wiring between these two components is incorrect. Thus also a given configuration can be examined automatically, simply and rapidly or an existing configuration seized werden.

In a particularly simple arrangement of the invention the measuring amplifiers send their answer signal at the same time. Thus will for a more-canal amplifier only one query line needed and the recognition of an incorrect wiring can to at least (more-canal) a measuring amplifier with associated measuring data evaluation unit be limited, which for a rapid error analysis are already sufficient kann.

In order to be able or around the exact defective equipment to determine be able to examine a whole configuration, it can be also intended that the measuring amplifiers are sequentially queried by the measuring data evaluation unit. Alternatively to it each measuring amplifier knows assigned identification over a its own it also separately queried werden.

The gegenständliche invention becomes in the following on the basis the schematic, exemplary and not restrictive and favourable arrangements of measurement data recordings figures showing 1 to 3 beschrieben.

An arrangement according to invention 1 for measurement data recording covers several (at least one) measuring sensor 4a - 4n, which in each case over measuring sensor lines 5 with a suitable measuring amplifier 3a - 3n is connected. The measuring amplifiers 3 can thereby in more-canal equipment, as equipment with several connections for measuring sensors 4, as in Fig. 1 represented, arranged its or a measuring amplifier 3 can be also separate equipment, as in Fig. 2 suggested. For the invention this distinction has however no Bedeutung.

The measuring amplifiers 3 are over measuring signal lines 6 with a measuring data evaluation A PATENT OFFICe heit 2, as e.g. indicating equipment or a test stand control, connected. Again each measuring amplifier can be connected 3 with its own measuring data evaluation unit 2 or an entrance of a more-canal measuring data evaluation unit 2, with which a parallel processing of measuring signals is possible. Alternatively also several measuring amplifiers can be connected 3 with only one measuring data evaluation unit 2 or only one entrance of a measuring data evaluation unit 2, if a serial processing of measuring signals is sufficient, as e.g. in Fig. 3 angedeutet.

Each measuring amplifier 3 is further connected with a query line 7. Also only one query line 7 can be intended, as in Fig for a more-canal measuring amplifier 3. 1 represented, it can be intended in addition, for each individual measuring amplifier 3 its own query line 7 or it is also conceivable to fold up the query line 7 and the measuring signal line 6 as in Fig. 2 angedeutet.

In order to thus recognize an incorrect wiring between measuring amplifier 3 and measuring data evaluation unit 2, an incorrect measuring signal line 6, now 2 over the query line 7 an inquiry signal, e.g. a certain impulse becomes by the measuring data evaluation unit, or a coded instruction, e.g. as pulse rate or in a digital data communication, or as signal of a certain frequency, etc., to the measuring amplifier 3 transmission. The measuring amplifier 3 recognizes this coded instruction and sends in consequence over the measuring signal lines 6 an appropriate answer signal, e.g. again as impulse, pulse rate or in a digital data communication, or as signal of a certain frequency, etc. the answer signal is favourably different thereby to the measuring signals, in order to make possible a simple recognition in the measuring data evaluation unit 2. If no answer signal arrives at an entrance of the measuring data evaluation unit 2, then can be assumed the wiring between the entrance of the measuring data evaluation unit 2 and the associated measuring amplifier 3, e.g.

between the measuring amplifier 3a and the measuring data evaluation unit 2 as in Fig. 1 suggested, incorrectly and/or not is missing, e.g. by an incorrect cable or by or badly put cable. As a possible wiring error can on a small unit, as e.g. a measuring data evaluation unit 2 or a more-canal measuring amplifier 3 or ideally on a certain measuring amplifier 3, limited werden.

In order to examine a given configuration, it can be also planned that each individual measuring amplifier 3 can be addressed separately. In addition each measuring amplifier 3 can have its own identification or become the measuring amplifiers 3 sequentially queried. Each measuring amplifier 3 sends thereupon its answer signal. If no answer signal arrives or at a wrong entrance an answer signal at the intended entrance of the measuring data evaluation unit 2, e.g. according to stored configuration, then a wiring error or an incorrect cable can be present. In this way a configuration of a measuring instrument can, or a part of such a configuration, also automatically examines werden.

If the measuring signal line 6 as querying line 7 is used at the same time, then it is favourable to dispatch the inquiry signal and/or the answer signal and the measuring signal in different frequency bands. The inquiry signal and/or the answer signal can exhibit thereby a clearly higher frequency, e.g. some powers of ten more highly, than a regular measuring signal. Thus can very simply distinctive between inquiry signal and/or answer signal and measuring signal werden.

Also the connecting quality can be examined by the evaluation of the signal quality of the answer signal, what also a diagnosis of the wiring zulässt.

Further also an existing wiring can be seized independently by the procedure according to invention. In addition the measuring amplifiers 3 are e.g. queried separately and examined on which channel of the measuring data evaluation unit 2 an answer zurückkommt.

So the configuration and e.g. an administrative software can be seized handed over werden.

Also the service personnel can be supported with the wiring, e.g. as patent office is constantly examined during the wiring whether the put cables correspond also to the intended configuration.