EP0423494A1 - Procédé et dispositif pour vérifier le fonctionnement de capteurs dans un véhicule - Google Patents

Procédé et dispositif pour vérifier le fonctionnement de capteurs dans un véhicule Download PDF

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Publication number
EP0423494A1
EP0423494A1 EP19900117841 EP90117841A EP0423494A1 EP 0423494 A1 EP0423494 A1 EP 0423494A1 EP 19900117841 EP19900117841 EP 19900117841 EP 90117841 A EP90117841 A EP 90117841A EP 0423494 A1 EP0423494 A1 EP 0423494A1
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EP
European Patent Office
Prior art keywords
count value
switch
plausibility check
value
plausibility
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19900117841
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German (de)
English (en)
Other versions
EP0423494B1 (fr
Inventor
Klaus Dipl.-Ing. Bleuel
Martin Dipl.-Ing. Grosser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0423494A1 publication Critical patent/EP0423494A1/fr
Application granted granted Critical
Publication of EP0423494B1 publication Critical patent/EP0423494B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue

Definitions

  • the invention relates to a method and a device for checking the functionality of different sensors on a vehicle.
  • Numerous sensors are used on vehicles, in particular to check the functionality of the internal combustion engine. So z. B. to determine the ignition timing and injection quantity, the speed is continuously monitored. If a sensor fails, this generally represents a safety risk for the continued operation of the vehicle. The functionality of the sensors must therefore be checked continuously. This is done in particular by a plausibility check as to whether the value of the received signal can be expected in comparison with the value of a signal received by another sensor. For example, there are various signals in a vehicle that are directly coupled to the speed. If a first such signal shows a high speed, a second shows a low speed, this is a sign that one of the sensors which the two signals deliver, works incorrectly. An error signal is then output, which is usually used to carry out an emergency run. Procedures of the above type are such. B. in DE 31 45 732 A1 (US 815 308).
  • DE 33 01 743 A1 discloses a method in which a plausibility check is not carried out between two analog signals, as mentioned above, but in which an analog signal is compared with a digital signal from a switch.
  • the analog signal is a voltage as it is emitted by a so-called pedal value transmitter, ie a potentiometer, the axis of rotation of which is coupled to the axis of rotation of an accelerator pedal.
  • the digital signal is the signal from a switch which is also coupled to the accelerator pedal axis and which switches when the accelerator pedal reaches a minimum position, which indicates idling.
  • a switch is called an empty gas switch.
  • Corresponding switches that switch when actuators assume a minimum or maximum position are used on various components, eg. B. on the brake pedal, on the throttle valve or the control rod of an injection pump. Plausibility checks can be carried out for all signals of such switches in relation to other signals.
  • the invention is based on the object of specifying a method for checking the functionality of sensors in a vehicle which also works very reliably when one of the sensors, the signals of which are subjected to a plausibility check in order to determine the functionality, is a switch.
  • the invention is further based on the object of specifying a device for executing such a method.
  • the inventive method is characterized in that after a switching operation of a switch whose signal is subjected to a plausibility check, the result of the plausibility check is only taken into account with a time delay after the switching operation.
  • the invention is based on the knowledge that the various unreliability of plausibility checks with the signals from switches that have been observed so far is due to the fact that some of the switches show a switch bounce for a short time after the switching process.
  • the waiting time is realized by repeating the plausibility check continuously and changing a count value in the process. With each plausible result, the count is set to an output count. If, on the other hand, the result of the plausibility check reveals implausibility, the count value is changed in a predetermined direction, e.g. B. reduced. If it reaches an error count, e.g. B. the value zero, this is the sign that the plausibility check, which indicates implausibility, may be trusted. The error signal is then output. The output and error count value and the step size during counting are set so that counting from one value to the other surely takes a longer period of time than corresponds to the bounce period.
  • the device according to the invention has a customary checking means for checking for plausibility and, moreover, a time condition means which checks whether there is still implausibility when a time condition is met.
  • the device preferably has a counting means for carrying out the counting method mentioned above.
  • a self-monitoring system with a delay circuit is already known from DE 34 23 404 A1.
  • a predetermined waiting time is started, which is dimensioned such that the battery voltage can recover to a normal level until the waiting time has expired. Only then are self-monitoring processes carried out.
  • Such a time delay method has nothing to do with the time delay in the method according to the invention for checking the functionality of sensors on a vehicle.
  • the two methods can be used together, i.e. H. Execution of the method according to the invention does not begin until it has been ensured that the battery voltage has recovered to a normal level after the vehicle engine has been started.
  • FIG. 1B The time-synchronous logic signal from an empty gas switch LGS is shown in FIG. 1B with the sequence of FIG. 1A.
  • the switch In the idle case LL, the switch outputs high level "1", while in the non-idle case LL outputs low level "0". Switching from one area to the other takes place at a relatively low accelerator pedal angle. Due to hysteresis effects, this angle can vary within small limits between an angle ⁇ 1 and an angle ⁇ 2, which are shown in FIG. 1A.
  • a lower voltage U1 from the pedal value transmitter belongs to the lower angle ⁇ 1, while an upper voltage U2 belongs to the upper angle ⁇ 2 of the hysteresis range.
  • Fig. 1B it is shown in detail that the signal from the empty gas switch when switching from the idle state to the non-idle state is not in a simple manner from LL to LL jumps, but that the high level LL is reached again several times within a period t after triggering the switching. It is now assumed that the signal from the empty gas switch LGS is repeatedly sampled by a computer. The sampling times are shown in FIG. 1B and the associated measuring cycles are denoted by n to n + 3. The measurement cycle n is the last one before switching from the idle state to the non-idle state.
  • the signal from the empty gas switch LGS drops from the high level LL to the low level LL , then to switch back to the high level due to switch bouncing and from there again to the low level LL to fall.
  • This low level is present at the next measurement cycle n + 1.
  • the voltage U from the pedal value transmitter PWG is above the upper voltage U2. The signals from the two sensors are therefore plausible to one another.
  • the device has a conventional microcomputer 10 with an A / D converter 11 and a logic measurement input 12.
  • the signal from a pedal value transmitter PWG 13 is fed to the A / D converter 11, while the logic measurement input 12 receives the signal from an empty gas switch LGS 14 receives.
  • the two sensors, that is, the pedal value sensor 13 and the empty gas switch 14 are supplied with a supply voltage VS of z. B. + 5 V. It is important for the method explained below with reference to FIG. 4 that the microcomputer 10 also contains a count value register 15.
  • step s3 the voltage is determined by the pedal value transmitter PWG.
  • step s2 it is checked whether the voltage has changed the range, that is from ⁇ U1 to> U2 or vice versa. According to the example in FIG. 1b, no range change is found for the measuring cycles n and n + 4 in step s2, while a range change is determined for the measuring cycles n + 1 and n + 3.
  • a step s3 is used Waiting time t 'set in the form of a count value. This waiting time is longer than the longest observed switch bounce time t. After step s3, the main program is returned to.
  • the waiting time t'new is set for the measuring cycles n + 2 and n + 3. Only in measuring cycle n + 4 is it determined that the range indicated by the pedal value transmitter PWG has not changed. The time count is then reduced by a predetermined value in a step s3 'and a check is carried out in a step s4 to determine whether the waiting time has expired. This is not the case with the example, which is why the main program is returned to. If step s4 is reached again the next time the test program is run, that is to say for measuring cycle n + 5, the waiting time t 'has still not expired, which is why the main program is re-entered.
  • step s6 the plausibility check explained above with reference to FIGS. 1A and 1B is carried out. If it is found in an evaluation step s7 that the signals are not implausible to one another, the main program is reached again. If, on the other hand, there is implausibility, this determination corresponds to an error signal which ensures that an error is displayed in step s8 and an emergency operation measure is taken. After that, the main program is also reached in this case. The nature of the emergency operation measure depends on the individual case.
  • the method according to FIG. 3 immediately applies the knowledge that it is expedient to wait for a waiting time to elapse after a change in position of the empty gas switch has been ascertained before the result of the plausibility check is trusted.
  • the method described in FIG. 4 described below also uses the expiry of a waiting time, but in an indirect manner, which leads to less computing effort than is required in the method according to FIG. 3.
  • step s4.1 The position of the empty gas switch LGS and the voltage from the pedal value transmitter PWG are determined in this.
  • step s4.2 the plausibility check, which has already been mentioned several times, is carried out.
  • step s4.3 it is checked whether implausibility is present. If this is not the case, the counter value Z of a counter is set to an output counter value A in step s4.4, in the example to the value "4". Then the main program continues. If, on the other hand, there is implausibility in step s4.3, a step s4.5 is reached in which it is checked whether the count value Z has reached the value "0".
  • step s4.6 If this is not the case, the count value Z is decreased by "1" in a step s4.6.
  • the main program follows. If, on the other hand, it occurs in step s4.5 that the counter has counted down to the count "0" as an error count, this determination corresponds to the output of an error signal which leads to an error display and emergency operation measures in step s4.7. The main program then follows again.
  • the method according to FIG. 4 can be carried out more easily than that according to FIG. 3, since it is not necessary to carry out a test for a change in the position of the empty gas switch.
  • the output count value A, the step size when counting and the error count value are set in such a way that, together with the time which elapses between two runs of the test program, it is ensured that an error signal is only output if more implausibility states than occur they can be determined within a switch bounce time.
  • the signals from an empty gas switch and a pedal value transmitter were used, since a reliable plausibility check is of particular importance for safety reasons for these signals. If implausibility is detected in the signals from these sensors, drastic emergency operation measures are always necessary. One tries to avoid unnecessary error signals. On the other hand, it is of the utmost importance to reliably identify errors that actually occur as quickly as possible.
  • the method according to the invention is particularly advantageous for this. However, it can be applied to all methods for checking the functionality of sensors in which one of the sensors is a switch. In this case, a switch is understood to be any sensor whose signal level changes abruptly when a predetermined value of the variable to be measured is exceeded.
  • the output of the error signal leads to an error display and to the taking of emergency operation measures.
  • one of the two measures can be dispensed with.
  • both sensors can also be switches.
  • the microcomputer 10 according to FIG. 2 is at the same time a test means for carrying out the plausibility check, and also a time condition means for checking whether the aforementioned time condition has been met, now check it using the method according to FIG. 3 or the one according to FIG. 4 or another method.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
EP90117841A 1989-10-18 1990-09-17 Procédé et dispositif pour vérifier le fonctionnement de capteurs dans un véhicule Expired - Lifetime EP0423494B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3934723A DE3934723A1 (de) 1989-10-18 1989-10-18 Verfahren und vorrichtung zum ueberpruefen der funktionsfaehigkeit von sensoren in einem fahrzeug
DE3934723 1989-10-18

Publications (2)

Publication Number Publication Date
EP0423494A1 true EP0423494A1 (fr) 1991-04-24
EP0423494B1 EP0423494B1 (fr) 1993-02-10

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EP90117841A Expired - Lifetime EP0423494B1 (fr) 1989-10-18 1990-09-17 Procédé et dispositif pour vérifier le fonctionnement de capteurs dans un véhicule

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EP (1) EP0423494B1 (fr)
JP (1) JP2958095B2 (fr)
DE (2) DE3934723A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753321A1 (fr) * 1996-08-08 1998-03-13 Bosch Gmbh Robert Procede pour surveiller l'aptitude au fonctionnement d'un convertisseur analogique/numerique
AT4497U3 (de) * 2001-03-28 2001-12-27 Avl List Gmbh Verfahren zur analyse und bewertung von messwerten eines offenen prüfsystems

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4210848A1 (de) * 1992-02-19 1993-08-26 Beckhausen Karlheinz Sicherheitseinrichtung
DE19636443A1 (de) * 1996-09-07 1998-03-12 Bosch Gmbh Robert Vorrichtung und Verfahren zur Überwachung von Sensoren in einem Fahrzeug
DE10144076A1 (de) * 2001-09-07 2003-03-27 Daimler Chrysler Ag Vorrichtung und Verfahren zur Früherkennung und Vorhersage von Aggregateschädigungen
KR100721058B1 (ko) * 2002-11-07 2007-05-22 주식회사 만도 차량용 센서의 고장발생 장치

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133906A (en) * 1983-01-20 1984-08-01 Bosch Gmbh Robert Fuel feed control means for a compression ignition internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133906A (en) * 1983-01-20 1984-08-01 Bosch Gmbh Robert Fuel feed control means for a compression ignition internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 231 (M-506)[2287], 12. August 1986; & JP-A-61 65 049 (TOYOTA MOTOR CORP.) 03-04-1986 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753321A1 (fr) * 1996-08-08 1998-03-13 Bosch Gmbh Robert Procede pour surveiller l'aptitude au fonctionnement d'un convertisseur analogique/numerique
AT4497U3 (de) * 2001-03-28 2001-12-27 Avl List Gmbh Verfahren zur analyse und bewertung von messwerten eines offenen prüfsystems

Also Published As

Publication number Publication date
DE59000883D1 (de) 1993-03-25
DE3934723A1 (de) 1991-04-25
EP0423494B1 (fr) 1993-02-10
JP2958095B2 (ja) 1999-10-06
JPH03138529A (ja) 1991-06-12

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