EP0811116B1 - Procede et dispositif de controle du systeme de dosage de carburant d'un moteur a combustion interne - Google Patents

Procede et dispositif de controle du systeme de dosage de carburant d'un moteur a combustion interne Download PDF

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Publication number
EP0811116B1
EP0811116B1 EP96926997A EP96926997A EP0811116B1 EP 0811116 B1 EP0811116 B1 EP 0811116B1 EP 96926997 A EP96926997 A EP 96926997A EP 96926997 A EP96926997 A EP 96926997A EP 0811116 B1 EP0811116 B1 EP 0811116B1
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EP
European Patent Office
Prior art keywords
pressure
pressure signal
internal combustion
combustion engine
value
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
EP96926997A
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German (de)
English (en)
Other versions
EP0811116A1 (fr
Inventor
Detlev Straub
Jürgen Biester
Martin Grosser
Claus Hinrichsen
Wilhelm Eyberg
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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Filing date
Publication date
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Publication of EP0811116A1 publication Critical patent/EP0811116A1/fr
Application granted granted Critical
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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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • 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
    • F02D41/22—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
    • F02D2041/223—Diagnosis of fuel pressure sensors
    • 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
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • 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
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F02D2200/0604—Estimation of fuel pressure
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off

Definitions

  • the invention relates to a method and a device to monitor a fuel metering system Internal combustion engine according to the generic terms of the independent Expectations.
  • Method and device for monitoring a Fuel metering system of an internal combustion engine known.
  • a Fuel metering system of an internal combustion engine known.
  • one supports Prefeed pump fuel from a low pressure range in a high pressure area.
  • the fuel is controllable injectors the individual combustion chambers of the Internal combustion engine metered.
  • a sensor detects the pressure in the High pressure range, which is taken into account in the control. Accurate fuel metering is only possible if the exact value of the pressure in the high pressure range is known.
  • the pressure is in the range between a few 100 to approx. 2000 bar. Within this The pressure sensor must reliably transmit a signal provide. A failure of the pressure sensor or a faulty signal from the pressure sensor leads to a inaccurate fuel metering.
  • the invention is based, with one Method and a device of the type mentioned improve the accuracy of fuel metering.
  • This Task is by the in the independent claims marked features solved.
  • WO / A-95/06814 discloses monitoring a Fuel metering system of an internal combustion engine, in which the Fuel from a low pressure area by means of a pump a high pressure area is promoted. From there by means of Fuel controllable depending on the operating parameters Injectors measurable the combustion chambers of the internal combustion engine. On Sensor provides a pressure signal that the pressure in the High pressure area characterized. In given Operating conditions, the pressure signal with an expected Value compared and, depending on the comparison, an incorrect one Pressure signal recognized.
  • the disadvantage of this device is that it cannot be distinguished whether there is a fault in the pressure sensor or from other components of the metering system.
  • DE-OS 43 35 700 is a device and a Method known in which a drift of the output signal of a position sensor is reliably detected. For this, in certain operating conditions in which the position of a Known approximately, the measured variable is recorded and with compared to the expected value. Starting from this Comparison can be a drift or an error of the Detect position sensor.
  • FIG. 1 shows a block diagram of a common rail system
  • Figure 2 a Flow chart of the method according to the invention.
  • FIG. 1 is a common rail system as a block diagram shown.
  • a control is designated by 100.
  • This includes a pressure controller 101, which is a switching means 102 controlled and with the output signals of a Current measuring means 103 is applied.
  • the current control 101 also processes the output signal of a pressure sensor 110 and the output signals from further sensors 105 first input of the switching means 102 is via the Current measuring means 103 connected to battery voltage.
  • the second connection of the switching means 102 is with a coil 115 in contact, the second input of which is connected to ground in Connection is established.
  • the other sensors 105 are sensors, the different operating states of the internal combustion engine and of the vehicle driven by the internal combustion engine to capture. This is for example the Speed N of the internal combustion engine and the accelerator pedal position, that identify the driver request.
  • the pressure sensor 110 detects the pressure in a rail 112 which assigned to the high pressure area of the fuel metering system is.
  • the rail 112 has various injectors 111 in Contact.
  • the rail 112 is connected via a high-pressure line 122 a high pressure pump 125 connected.
  • the high pressure line 122 is also via a pressure control valve 120 with a Return line 121 in contact.
  • the high pressure pump 125 is stopped with a prefeed pump 127 and a filter 129 with a Tank in connection. With the tank there is also Return line 121 in connection.
  • the pre-feed pump 127 pumps the fuel out of the tank via the filter 129 to high pressure pump 125.
  • This area is called Designated low pressure range.
  • the high pressure pump 125 delivers the fuel under high pressure over the High pressure line 122 into rail 112.
  • the pressure in rail 112 and thus in the high pressure area by means of the pressure sensor 110 detected and fed to the controller 100.
  • the controller 100 applies sensors to the injectors 111 with control signals that control the fuel metering.
  • the pressure in the High-pressure line 122 and thus in the rail 112 to predeterminable Values can be set.
  • the pressure control valve 120 is like this trained that it at a predetermined pressure in High pressure area the connection to the return line 121 releases and thus the pressure is reduced until it is below the predeterminable pressure value drops.
  • the pressure value at which the Pressure control valve 120 releases the connection by means of the coil 115 can be adjusted. Depending on the current I, that flows through the coil 115 turn up different pressure values in the high pressure range.
  • Step 200 it is checked whether a defined one Operating status is present. If this is the case, then in Step 210 the actual pressure PI from the pressure sensor 110 detected. In step 220, starting from various Quantities which are detected by means of sensors 225 expected value PS determined for the pressure. The value PS will preferably depending on suitable sizes from one Map memory read out. In the subsequent step 230 the two pressure values PI and PS are checked for plausibility checked.
  • step 200 If the measured pressure value PI is plausible, then this sets Program continues with step 200.
  • Query 230 recognizes that the values are not plausible, so in step 250 the Measured values PI corrected or an error is recognized.
  • implausible Pressure values detected for errors This is in step 250 displayed. This can be done using a Display device take place. On the other hand, it is also possible in this case to initiate an emergency operation.
  • drift is recognized and corrected this.
  • the difference becomes in step 250 between the expected value PS and the measured value PI certainly. Based on this difference, one can then Determine the correction value for the measured value PI. With this Correction value, the measured value is continuously corrected.
  • step 200 checks whether there is an overrun operation.
  • overrun mode no fuel is usually injected. Will the Thrust operation is recognized, so the pressure control valve 120 controlled so that it is in its open position remains.
  • the pressure value PS that now arises only shows still a relatively small spread.
  • the value PS expected for this operating state depends of the speed N stored in a map. Gives way to measured pressure PI from the speed-dependent value PS around more than a predefinable threshold value, then in Step 250 detected for errors.
  • the Check before starting the engine or after the shutdown of the internal combustion engine is usually the pressure control valve 120 controlled so that the pressure decreases. Usually the pressure decreases to atmospheric pressure or it builds up down to a predetermined value. This predetermined value depends on the design of the pressure control valve. According to the invention, query 200 therefore checks whether the engine is turned off, that is, whether it is before or after the start.
  • Step 210 the program starts Step 210 before starting or after turning off is processed automatically.
  • the pressure PI is recorded and with a predetermined value, that of the pressure control valve used 120 depends. Is the pressure control valve designed so that there is a decrease in pressure to atmospheric pressure enables, an output signal of a Atmospheric pressure sensor used as a comparison value PS become.
  • the detected value PI of the pressure compared with a value PS, the of the current I flowing through the pressure control valve 115 depends.
  • the pressure P it was recognized that there was a defined relationship between the pressure P and the the pressure control valve I gives flowing current.
  • the Current I becomes a setpoint PS for the setpoint in step 220 of the pressure.
  • the expected one Pressure value as a function of the current stored in a map. This procedure is used to check the correct function of the pressure sensor without using any other Sensors possible.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un procédé et un dispositif de contrôle du système de dosage de carburant d'un moteur à combustion interne. Le carburant est refoulé par une pompe d'une zone de basse pression à une zone de haute pression, d'où il est amené aux chambres de combustion du moteur à combustion interne par des injecteurs réglables en fonction des caractéristiques de fonctionnement du moteur. Un capteur génère un signal de pression qui caractérise la pression dans la zone de haute pression. Dans des états de fonctionnement prédéterminés, le signal de pression est comparé à une valeur attendue, ce qui permet de reconnaître un signal de pression non conforme.

Claims (8)

  1. Procédé de contrôle d'un système de dosage de carburant d'un moteur à combustion interne, dans lequel on transfert le carburant au moyen d'une pompe depuis une zone à basse pression dans une zone à haute pression, et de là au moyen d'injecteurs qui peuvent être commandés en fonction de grandeurs caractéristiques de la marche on peut fournir de façon dosée le carburant aux chambres de combustion du moteur à combustion interne, un capteur préparant un signal de pression qui caractérise la pression dans la zone à haute pression,
    caractérisé en ce que
    lors de la marche en poussée ou en inertie forcée la vanne de réglage de la pression est commandée d'une manière telle qu'elle demeure dans sa position ouverte,
    on compare le signal de pression à une valeur attendue et on constate que l'on a un signal entaché d'erreur, quand le signal de pression (PI) s'écarte de la valeur attendue (PS) de plus d'une valeur de seuil que l'on peut définir au préalable.
  2. Procédé de contrôle d'un système de dosage de carburant d'un moteur à combustion interne, dans lequel on transfert le carburant au moyen d'une pompe depuis une zone basse pression dans une zone haute pression, et de là au moyen d'injecteurs qui peuvent être commandés en fonction de grandeurs caractéristiques de la marche on peut fournir de façon dosée le carburant aux chambres de combustion du moteur à combustion interne, un capteur préparant un signal de pression qui caractérise la pression dans la zone à haute pression,
    caractérisé en ce que
    en marche à vide et/ou avant le démarrage, on compare le signal de pression à une valeur attendue PI et on constate qu'il y a un signal de pression entaché d'erreur, quand le signal de pression (PI) s'écarte de la valeur attendue (PS).
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    la valeur attendue peut être définie à l'avance en fonction de la vitesse de rotation.
  4. Procédé selon la revendication 2
    caractérisé en ce que
    la valeur attendue est fournie par un capteur de la pression atmosphérique.
  5. Procédé selon la revendication 1 ou 2
    caractérisé en ce qu'
    on peut alimenter une vanne de réglage de la pression avec une intensité que l'on peut définir au préalable et on contrôle si la signal de pression tombe à la valeur attendue.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    la valeur attendue peut être définie au préalable en fonction de l'intensité qui passe à travers la vanne de régalage de la pression.
  7. Dispositif de contrôle d'un système de dosage de carburant d'un moteur à combustion interne, dans lequel on transfert le carburant au moyen d'une pompe depuis une zone basse pression dans une zone haute pression, et de là au moyen d'injecteurs qui peuvent être commandés en fonction de grandeurs caractéristiques de la marche on peut fournir de façon dosée le carburant aux chambres de combustion du moteur à combustion interne, un capteur préparant un signal de pression qui caractérise la pression dans la zone haute pression,
    caractérisé en ce qu'
    on prévoit des moyens qui commandent en marche en poussée ou inertie forcée la vanne de réglage de la pression d'une manière telle qu'elle demeure dans sa position ouverte et
    on compare le signal de pression à une valeur attendue et on constate que l'on a un signal entaché d'erreur, quand le signal de pression (PI) s'écarte de la valeur attendue (PS) de plus d'une valeur de seuil que l'on peut définir au préalable.
  8. Dispositif de contrôle d'un système de dosage de carburant d'un moteur à combustion interne, dans lequel on transfert le carburant au moyen d'une pompe depuis une zone basse pression dans une zone haute pression, et de là au moyen d'injecteurs qui peuvent être commandés en fonction de grandeurs caractéristiques de la marche on peut fournir de façon dosée le carburant aux chambres de combustion du moteur à combustion interne, un capteur préparant un signal de pression, qui caractérise la pression dans la zone à haute pression,
    caractérisé en ce qu'
    on prévoit des moyens qui commandent en marche à vide et/ou avant le démarrage comparent le signal de pression à une valeur attendue et constatent que l'on a un signal entaché d'erreur quand le signal de pression(PI) s'écarte de la valeur attendue (PS) .
EP96926997A 1995-12-20 1996-07-18 Procede et dispositif de controle du systeme de dosage de carburant d'un moteur a combustion interne Expired - Lifetime EP0811116B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19547647 1995-12-20
DE19547647A DE19547647A1 (de) 1995-12-20 1995-12-20 Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems einer Brennkraftmaschine
PCT/DE1996/001349 WO1997022791A1 (fr) 1995-12-20 1996-07-18 Procede et dispositif de controle du systeme de dosage de carburant d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0811116A1 EP0811116A1 (fr) 1997-12-10
EP0811116B1 true EP0811116B1 (fr) 2000-04-26

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EP96926997A Expired - Lifetime EP0811116B1 (fr) 1995-12-20 1996-07-18 Procede et dispositif de controle du systeme de dosage de carburant d'un moteur a combustion interne

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Country Link
EP (1) EP0811116B1 (fr)
JP (1) JP4073485B2 (fr)
KR (1) KR100413305B1 (fr)
DE (2) DE19547647A1 (fr)
WO (1) WO1997022791A1 (fr)

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Also Published As

Publication number Publication date
JP4073485B2 (ja) 2008-04-09
DE19547647A1 (de) 1997-06-26
EP0811116A1 (fr) 1997-12-10
KR19980702318A (ko) 1998-07-15
DE59605057D1 (de) 2000-05-31
JPH11506813A (ja) 1999-06-15
KR100413305B1 (ko) 2004-05-10
WO1997022791A1 (fr) 1997-06-26

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