EP0446453B1 - Procédé et dispositif de commande et/ou de régulation du moteur automobile à combustion - Google Patents

Procédé et dispositif de commande et/ou de régulation du moteur automobile à combustion Download PDF

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Publication number
EP0446453B1
EP0446453B1 EP90124329A EP90124329A EP0446453B1 EP 0446453 B1 EP0446453 B1 EP 0446453B1 EP 90124329 A EP90124329 A EP 90124329A EP 90124329 A EP90124329 A EP 90124329A EP 0446453 B1 EP0446453 B1 EP 0446453B1
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EP
European Patent Office
Prior art keywords
detection element
combustion engine
signals
internal combustion
operating parameter
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.)
Expired - Lifetime
Application number
EP90124329A
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German (de)
English (en)
Other versions
EP0446453A1 (fr
Inventor
Werner Dipl.-Phys. Nitschke
Reinhard Dipl.-Ing. Pfeufer
Wolfgang Dipl.-Ing. Drobny
Hans-Peter Dipl.-Ing. Goldhammer (Fh)
Johann Dipl.-Ing. Schmid (Fh)
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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0446453A1 publication Critical patent/EP0446453A1/fr
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Publication of EP0446453B1 publication Critical patent/EP0446453B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/107—Safety-related aspects
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0404—Throttle position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/08—Redundant elements, e.g. two sensors for measuring the same parameter

Definitions

  • the invention relates to a method and a device for electronic control and / or regulation of an internal combustion engine of a motor vehicle according to the preambles of the independent claims.
  • Such a method or such a device is known from DE-OS 35 10 173.
  • a detection element assigned to the accelerator pedal generates at least one signal representing the position of the accelerator pedal and, at least depending on the latter, the throttle valve position and thus the air supply to the internal combustion engine are regulated.
  • the detection element which consists of two potentiometers connected to the accelerator pedal
  • the position signal of the one is compared in a logic unit with a threshold value derived from the position signal of the second potentiometer, and in this way the correct function of the detection element, in particular of the first potentiometer, detected.
  • the potentiometer-switch combination can be configured such that the potentiometer signal and the switching signal change in opposite directions with respect to the position of the accelerator pedal connected to them.
  • using a second potentiometer instead of the switch will only a change in the same direction of the signals with respect to the position of the accelerator pedal is proposed, ie a change in the accelerator pedal position leads to a change in the same direction of both potentiometer signals.
  • Such a procedure cannot ensure a reliable check of the respective detection element, since possible types of error such as shunts between the two potentiometer wipers or non-linearities of the potentiometers cannot be detected.
  • the invention is based on the object of providing measures in a method or a device for controlling and / or regulating an internal combustion engine, with the aid of which comprehensive safety monitoring is ensured.
  • the detection element for an operating parameter of the internal combustion engine or the motor vehicle generates a plurality of signals representing the operating parameter, which signals are designed such that when the operating parameter determined by the detection element changes, the signal variables change in opposite directions.
  • DE-OS 36 21 937 proposes a monitoring device for an electronic control device in a motor vehicle, a detection device for determining an operating parameter of the internal combustion engine and / or the motor vehicle, in particular the respective position of an element determining the performance of the internal combustion engine, such as throttle valve or Control rod and / or accelerator pedal is provided and by comparing the signal values emitted by the detection element with predefined limit values, fault states in the respective detection element are deduced.
  • a position detection member for a movable part in a motor vehicle is known, which is designed in the form of a multi-path potentiometer and is used to improve the resolution of the position detection in predetermined areas of the position of the element connected to it.
  • the procedure according to the invention has the advantage that both the nonlinearities of the detection element or characteristic curve deviations as well as shunts between the signal lines of the sensors can be detected due to the electrical countercurrent of the signals emitted by the respective detection element consisting of several sensors. Comprehensive security monitoring of the detection element can thus be ensured by the procedure according to the invention.
  • the procedure according to the invention offers particular advantages in connection with a detection element designed as a double potentiometer for determining the position of a performance-determining element, such as throttle valve, control rod and / or a control element that can be actuated by the driver, such as an accelerator pedal of an electronic accelerator pedal.
  • a detection element designed as a double potentiometer for determining the position of a performance-determining element, such as throttle valve, control rod and / or a control element that can be actuated by the driver, such as an accelerator pedal of an electronic accelerator pedal.
  • FIG. 1 shows an exemplary circuit arrangement for realizing the inventive idea
  • FIG. 2 shows a flow chart to clarify the signal evaluation.
  • FIG. 1 shows a detection element 10 for the position of an element of a motor vehicle, not shown, which determines the performance of the internal combustion engine, in particular a power actuator such as a throttle valve or control rod and / or an accelerator pedal of an electronic accelerator pedal system which comprises two sensors or transmitters P1 and P2, which are shown in FIG. 1 as a so-called double potentiometer.
  • the resistance track 12 is connected via its line 16 to the positive pole of the supply voltage, via line 18 to the negative pole of the supply voltage.
  • the resistance path 14 of the sensor P1 is linked via line 20 to the positive, via line 22 to the negative pole of the supply voltage.
  • Both resistance tracks 12, 14 are covered by movable grinders 24, 26 connected to the respective performance-determining element of the motor vehicle.
  • the two grinders 24 and 26 are coupled to one another via a mechanical connection 28 such that both move parallel to one another in the same direction, depending on the power-determining element (not shown).
  • the wiper sweeping over the first resistance track 12 is guided to a connection point P1S via a line 30 and a resistor 32 with the resistance value RS1. while the wiper 26 crossing the second resistance path 14 is conducted via line 34 and resistor 36 with resistance value RS2 to connection point P2S.
  • a resistor 38 with the resistance value R is connected to the connection point P1S, and a line 40 is connected on the one hand, which connects the connection point P1S to the computing unit 44.
  • the resistor 38 is connected with its second connection to the negative pole of the supply voltage.
  • the resistor 46 with the resistance value R and the line 48, which connects the connection point P2S to a computing or evaluation unit 44, are connected to the connection point P2S.
  • the other connection of the resistor 46 is connected to the positive pole of the supply voltage in accordance with the electrical counter-current of the two sensors.
  • the connecting line 40 connects the connection point P1S of the first sensor to an input 42 of the computing unit 44, while the line 48 connects the connecting point P2S of the second sensor to a second input 50 of the computing unit 44.
  • the computing unit 44 in the illustration of which FIG. 1 does not include components which do not directly support the procedure according to the invention, comprises a first A / D converter 52 assigned to the input 42 and a second A / D converter assigned to the second input 50.
  • Converter 54 a processing unit 55 and an output stage 56.
  • the output stage 56 is assigned to the output 57 of the computing unit 44, to which line 58 is applied, which connects the computing unit 44 to devices 60 for influencing an operating parameter of an internal combustion engine.
  • the devices 60 are a power actuator provided with an electrically actuable servomotor, such as, for example, a throttle valve for controlling the air throughput to the internal combustion engine or a control rod for influencing the amount of fuel supplied to the internal combustion engine, or a device for controlling injection valves.
  • an electrically actuable servomotor such as, for example, a throttle valve for controlling the air throughput to the internal combustion engine or a control rod for influencing the amount of fuel supplied to the internal combustion engine, or a device for controlling injection valves.
  • the computing unit 44 naturally has further inputs and outputs, not shown, which are used to carry out further control functions, such as ignition, fuel injection and / or idling control.
  • the performance-determining element of the motor vehicle or the internal combustion engine which in the preferred exemplary embodiment is a throttle valve or control rod and / or an accelerator pedal of an electronic accelerator pedal system, is rigid with the two grinders 24 and 26 or signal lines 30 and 34 of the two sensors P1 and P2 are connected, so that a change in position of this element leads to a corresponding change in position of the two wipers 24 and 26.
  • a change in position of the two wipers takes place in the same direction, in the same direction.
  • a movement of the throttle valve in the direction of its fully open position means a change in the sliders 24 and 26 in FIG.
  • connection points P1S and P2S are then corresponding to the position of the wipers 24 and 26 at a potential value formed by the resistors RS1 and R or RS2 and R, which represent a measure of the respective positions of the wipers and thus of the position of the power-determining element . It is It should be noted that a change in the position of the power-determining element in the direction of a larger opening leads to an increase in the potential at the connection point P1S and to a lowering of the potential at the connection point P2S, and the two sensors accordingly behave in opposite electrical directions.
  • the two voltage values corresponding to the positions of the sensors P1 and P2 are fed to the inputs 42 and 50 of the computing unit 44.
  • the A / D converters assigned to the inputs form digital signals from the analog voltage signals for further processing in processing unit 55.
  • the voltage signals are converted into corresponding position values for the respective performance-determining element of the motor vehicle or the internal combustion engine, and on the basis of these position values, which in the case of an electronic accelerator pedal system correspond to a target or an actual value, the output stage 56 controls the devices 60 accordingly.
  • the processing unit 55 In order to improve the security of the system, it is provided in the processing unit 55 that the values read in via the inputs 42 and 50 and the A / D converters 52 and 54 are checked individually and with one another to determine whether the detection element 10 is functioning correctly. It is also provided that appropriate measures are taken in the event of a recognized inability to function.
  • the procedure for checking the function of the detection element 10 and the measures to be taken when the inability to function is detected are shown in FIG. 2 on the basis of a flow chart executed in the processing unit 55.
  • Step 102 the position values determined by the respective sensor are read in and compared in query block 104 with their upper maximum limit. If it is recognized in step 104 that the position value of the respective sensor is greater than its maximum permissible value, an individual error of the respective sensor is recognized in block 106 and a corresponding mark is set and the program part continues.
  • An individual fault identified after step 106 indicates a short circuit either from the negative to the positive pole of the supply voltage of the sensor or from the connection point P1S or P2S to the positive pole of the supply voltage or to an interruption of the connection at the negative pole of the supply voltage of the respective sensor.
  • a corresponding mark can also be set in step 106.
  • step 108 If it has been determined in step 104 that the respective position value is below its upper limit, it is checked in step 108 whether the position value is less than a lower minimum threshold. In the opposite case, the individual fault detection is completed in step 110 by setting a mark for the functionality of the individual sensors. If, according to step 108, the position value of the respective sensor is below the predetermined minimum value, a second individual error is recognized in step 112 and a corresponding mark is set. This second individual fault can indicate short circuits from the positive pole of the supply voltage to the negative, from the connection point P1S or P2S to the negative pole of the supply voltage or to interruptions in the positive supply voltage lines or the wiper or connection lines.
  • step 116 This limp home function can either be from a shutdown of the System or from a continuation of the function of the system based on the sensor that is considered to be functioning correctly.
  • step 116 the program part is ended and is carried out again.
  • step 118 the functionality of the entire detection element 10 is checked in step 118 by comparing the amount of a difference in the position values generated by the sensors with a predetermined threshold. If the difference is below the predetermined threshold, the operability of the detection element is determined in step 120 and the system function is taken up as normal operation. However, if the difference after step 118 is above the predetermined threshold, a flag is set for an error in the detection element in step 122 and an emergency operation function is initiated.
  • An error detected in step 122 indicates shunts between the supply voltage poles and the wiper connection points, a shunt, in contrast to the short circuit, having a finite contact resistance.
  • the emergency operation measure taken in step 122 can consist in either stopping the system or continuing the system function on the basis of the respective smaller position value.
  • the procedure according to the invention can also be applied to detection organs with a plurality of sensors, at least one of the sensors then having electrical opposition in relation to the others and the position signal of this or these sensors being used to check the function of the others.
  • a further advantageous embodiment of the detection element according to FIG. 1 results from the different selection of the resistance values of the resistors 38 and 46.
  • This measure also in connection with the dimensioning of the resistors 32 and 36 and / or the resistance tracks 12 and 14, leads to the above advantages shown regarding the choice of the resistances of the resistance tracks 12 and 14.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)

Claims (12)

  1. Procédé de commande et/ou de régulation électronique d'un moteur thermique d'un véhicule automobile, dans lequel au moins un organe de détection (10) génère au moins deux signaux représentant un paramètre de fonctionnement du moteur ou du véhicule, et cela en permanence par rapport au paramètre de fonctionnement, qui sont envoyés à un système de commande et/ou de régulation (44) pour commander et/ou réguler le moteur thermique et pour contrôler l'aptitude au fonctionnement d'au moins un organe de détection (10), le contrôle du fonctionnement se faisant au moins par l'exploitation de la déviation au moins des deux grandeurs de signaux,
    procédé caractérisé en ce que l'organe de détection (10) est conçu pour qu'au moins les deux grandeurs de signaux changent en sens opposé lorsque le paramètre de fonctionnement change.
  2. Procédé selon la revendication 1, caractérisé en ce que l'organe de détection génère des grandeurs de signaux représentant la position d'un élément définissant la puissance du moteur thermique ou du véhicule comme l'organe de réglage de la puissance et/ou la pédale d'accélérateur.
  3. Procédé selon la revendication 2, caractérisé en ce que l'organe de détection est au moins un potentiomètre double avec chaque fois des valeurs de résistance différentes associées à chaque potentiomètre séparé.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que les signaux de l'organe de détection qui sont fournis à au moins une unité de calcul ou d'exploitation, séparément et/ou en commun, sont exploités pour contrôler l'aptitude au fonctionnement de cet organe de détection.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'exploitation se fait selon les étapes suivantes :
    - contrôle séparé des grandeurs des signaux dans une plage de valeurs autorisées pour reconnaître des défauts individuels,
    - contrôle de l'amplitude de la différence des signaux avec une valeur limite prédéterminée pour reconnaître les états de défauts au niveau de l'organe de détection,
    - prise de mesure de secours en cas de défaut.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que les mesures de secours sont la coupure du système de commande et/ou de régulation, la poursuite du fonctionnement du système de commande et/ou de régulation en fonction d'un signal non entaché d'erreur ou à une valeur plus faible.
  7. Installation de commande et/ou de régulation électronique d'un moteur thermique d'un véhicule automobile, comprenant :
    - au moins un organe de détection (10) d'un paramètre de fonctionnement du moteur thermique ou du véhicule, cet organe de détection (10) générant au moins deux signaux liés en permanence au paramètre de fonctionnement et qui représentent ce paramètre de fonctionnement,
    - au moins un organe de détection (10) avec au moins deux capteurs ou détecteurs (P1, P2),
    - un système de commande et/ou de régulation (44) qui reçoit au moins deux signaux de commande et/ou de régulation du moteur thermique,
    - des moyens (55) qui définissent au moins à partir de la déviation d'au moins ces deux signaux, l'un par rapport à l'autre, l'aptitude au fonctionnement de cet organe de détection (10),
    installation caractérisée en ce que :
    - cet organe de détection (10) est conçu pour qu'en cas de variation du paramètre de fonctionnement au moins les deux signaux changent en opposition.
  8. Installation selon la revendication 7, caractérisée en ce que le paramètre de fonctionnement et la position d'un élément définissant la puissance du moteur thermique et/ou du véhicule et l'organe de détection, est un capteur de position associé respectivement à un tel élément.
  9. Installation selon la revendication 8, caractérisée en ce qu'au moins un organe de détection comprend au moins deux capteurs en forme de potentiomètres ayant des valeurs de résistance différentes, les deux capteurs étant associés au même élément définissant la puissance.
  10. Installation selon l'une des revendications précédentes, caractérisée par au moins une unité de calcul ou d'exploitation qui exploite les signaux fournis par l'organe de détection pour contrôler son aptitude au fonctionnement.
  11. Installation selon les revendications 8 ou 9, caractérisée en ce que l'organe de détection est un potentiomètre double, l'un des potentiomètres individuels étant polarisé en opposition sur la tension de fonctionnement de l'autre potentiomètre individuel.
  12. Installation selon l'une des revendications précédentes, caractérisée en ce que les signaux représentant le paramètre de fonctionnement pour l'organe de détection sont fournis séparément et/ou en commun pour la suite du traitement à une unité de calcul ou d'exploitation.
EP90124329A 1990-02-10 1990-12-15 Procédé et dispositif de commande et/ou de régulation du moteur automobile à combustion Expired - Lifetime EP0446453B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4004085A DE4004085A1 (de) 1990-02-10 1990-02-10 Verfahren und einrichtung zur elektronischen steuerung und/oder regelung einer brennkraftmaschine eines kraftfahrzeugs
DE4004085 1990-02-10

Publications (2)

Publication Number Publication Date
EP0446453A1 EP0446453A1 (fr) 1991-09-18
EP0446453B1 true EP0446453B1 (fr) 1993-11-24

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EP90124329A Expired - Lifetime EP0446453B1 (fr) 1990-02-10 1990-12-15 Procédé et dispositif de commande et/ou de régulation du moteur automobile à combustion

Country Status (5)

Country Link
US (1) US5260877A (fr)
EP (1) EP0446453B1 (fr)
JP (1) JP3588127B2 (fr)
CZ (1) CZ279398B6 (fr)
DE (2) DE4004085A1 (fr)

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DE4004085A1 (de) 1991-08-14
US5260877A (en) 1993-11-09
EP0446453A1 (fr) 1991-09-18
DE59003628D1 (de) 1994-01-05
JPH04214949A (ja) 1992-08-05
CZ279398B6 (cs) 1995-04-12
JP3588127B2 (ja) 2004-11-10
CS9100296A2 (en) 1991-08-13

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