EP0886056A1 - Méthode et dispositif pour la surveillance d'un système d'alimentation en carburant - Google Patents

Méthode et dispositif pour la surveillance d'un système d'alimentation en carburant Download PDF

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Publication number
EP0886056A1
EP0886056A1 EP98108227A EP98108227A EP0886056A1 EP 0886056 A1 EP0886056 A1 EP 0886056A1 EP 98108227 A EP98108227 A EP 98108227A EP 98108227 A EP98108227 A EP 98108227A EP 0886056 A1 EP0886056 A1 EP 0886056A1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
fuel supply
monitoring
signal
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
EP98108227A
Other languages
German (de)
English (en)
Other versions
EP0886056B1 (fr
Inventor
Christof Hammel
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 EP0886056A1 publication Critical patent/EP0886056A1/fr
Application granted granted Critical
Publication of EP0886056B1 publication Critical patent/EP0886056B1/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
    • 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
    • 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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02D2041/224—Diagnosis of the fuel system
    • 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
    • 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
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • 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

Definitions

  • the invention relates to a method and a device for monitoring a fuel metering system.
  • a method and an apparatus for monitoring a Fuel metering systems are from DE 38 02 770 (US 4,905,645). There is a procedure for Monitoring a security device to interrupt the Fuel supply described.
  • This security means will referred to as a safety shut-off valve or as an ELAB the internal combustion engine control unit is at Switching off the internal combustion engine switched off with a time delay.
  • the safety shut-off valve is actuated when switching off and the engine going out as correct Function of the safety shut-off valve evaluated. Does that The engine does not switch off, so the device recognizes malfunction of the safety shut-off valve and represents the internal combustion engine by means of the fuel quantity adjuster from.
  • From DE-OS 195 48 280 is a fuel metering system known, which is referred to as a common rail system.
  • the invention has for its object a method and a device for monitoring a fuel system to provide with the particular one Safety shutdown valve can be checked safely without that this affects the behavior of the Has internal combustion engine. This task is carried out by the in features characterized in the independent claims solved.
  • FIG. 1 shows 2 shows a block diagram of the device according to the invention
  • FIG. 2 a flowchart of the inventive method and figure 3 different signals plotted over time.
  • FIG. 1 are those for understanding the invention required components of a Fuel supply system of an internal combustion engine with High pressure injection shown.
  • the system shown is commonly referred to as a common rail system.
  • With 10 is called a fuel tank. This stands via a fuel supply line with a filter 15, one Pre-feed pump 20, a safety shut-off valve 25, one High-pressure feed pump 30 in connection with a rail 35.
  • a pressure control valve 40 or a pressure relief valve arranged in the fuel supply line. Means this valve is the supply line with a Return line 45 connectable.
  • the pressure control valve connects the high pressure area with a low pressure area. The fuel returns via the return line 45 the tank 10.
  • the safety shutdown valve 25 is by means of a coil 26 actuatable. Accordingly, the valve 40 is by means of a Coil 41 controllable.
  • a sensor 50 is on the rail 35 arranged. This sensor 50 is preferably around a pressure sensor that has a signal provides that the fuel pressure in the rail and thus the Pressure in the high pressure area corresponds.
  • the rail 35 is connected to the individual injectors 61 to 66 in connection.
  • the injectors comprise solenoid valves 71 to 76 by means of which the Fuel flow is controllable through the injectors. Of the injectors each have a connection with the return line 45 in connection.
  • the output signal of the pressure sensor 50 and the Output signals of further sensors 80 reach one Control unit 100 which in turn solenoid valves 71 to 76, the coil 26 of the pre-feed pump, the coil 41 of the Pressure control valve 40 and the high pressure feed pump controls.
  • the control unit is constantly on a first line 90 in connection with supply voltage Ubat. At a particularly advantageous embodiment provides that this line by means of a switching means, in particular of a relay can be interrupted by the control unit.
  • the control unit 100 is also connected via a second line 95 in connection with the supply voltage Ubat.
  • the line is a switch 96 which can be actuated by the driver arranged.
  • the connection with which this switch with the Control unit 100 is connected as terminal 15 designated. If there is a voltage at terminal 15, then the internal combustion engine switched on. There is no tension indicates that the driver is the internal combustion engine has switched off.
  • the pre-feed pump 20 that as an electric fuel pump or mechanical pump can be carried, promotes the fuel that is in the Fuel reservoir 10 is located via a filter 15 to the high pressure feed pump 30.
  • the high pressure feed pump 30 feeds the fuel into the rail 35 and builds one there Pressure on.
  • the safety shutoff valve 25 which is arranged by of the control unit 100 can be controlled in order to control the fuel flow to interrupt.
  • Control unit 100 determines control signals Actuation of the solenoid valves 71 to 76 of the injectors 61 to 66. By opening and closing the solenoid valves 71 to 76 becomes the beginning and end of fuel injection controlled in the internal combustion engine.
  • the pressure of the fuel is measured by means of the pressure sensor 50 detected in the rail 35 and thus in the high pressure area.
  • the control unit 100 calculates a signal from this value to act on the pressure control valve 40.
  • the pressure is increased by actuating the pressure control valve 40 regulated a predeterminable value, which among other things from Operating conditions of the internal combustion engine depends on that can be detected by means of the sensors 80.
  • the pressure by measures in Low pressure range is regulated. So you can for example the pressure in the high pressure range with a regulate a suitable high-pressure feed pump.
  • the safety shutoff valve 25 is a safety-critical component whose function is constant must be guaranteed.
  • the pressure control valve When the engine is turned off by appropriate control of the pressure control valve and tries to increase the pressure by closing the ELAB achieve. If a corresponding pressure increase is achieved, then the ELAB does not shut off the fuel supply sufficiently and the ELAB is recognized as defective.
  • the test procedure for the ELAB a pressure increase in High pressure area, especially in the rail 35 as a criterion to ensure that the ELAB is not working correctly.
  • FIG. 2 An embodiment of the procedure according to the invention is shown as a flow chart in Figure 2.
  • the program starts in step 200 after the signal at terminal 15 (KL15) indicates that the driver is the internal combustion engine wants to turn off. In this case, it is usually due to a clamp 15 no voltage on. There is a corresponding signal value Terminal 15, then the shutdown begins Internal combustion engine.
  • a time counter t becomes zero reset.
  • a first one Pressure value P1 recorded.
  • the pressure value P1 is the pressure value that is currently available when the parking request the driver is recognized.
  • step 220 the control unit increases this Control signal DRV for the pressure control valve 40 by one first value ⁇ DRV1. This is then carried out in step 230 Control of the ELAB so that it is the fuel supply prevents. Then in step 240 the is still Idle control LL active. The subsequent query 250 checks to see if a time counter is greater than a threshold T1 is. If this is not the case, step is repeated 240.
  • This query 250 ensures that the test cycle matches the Controls described above for a time T1 in this State remains.
  • This time T1 is chosen so that the dead volume between the ELAB 25 and the High pressure feed pump 30 breaks down.
  • the time period is T1 between approx. 150 ms and 200 ms. This delay is for the driver not recognizable. After that time there is pressure in the low pressure area before the high pressure pump under the The minimum inlet pressure of the high pressure pump has dropped.
  • step 260 Fuel quantity QK to be injected set to zero. This means the injectors are controlled so that they stop measuring fuel.
  • step 270 that is Control signal DRV for the pressure control valve to a value DRV2 set. This value DRV2 is chosen so that the Pressure control valve 40 essentially completely closes. From At this point, all fuel is still on conveyed into the rail 35 by the high-pressure feed pump 30 becomes available for pressure build-up. If the ELAB 25 is defective and / or does not close completely, the High pressure feed pump 30 continue to promote and the pressure P im Rail rises. If the ELAB is OK, the pressure can no longer increase, but will always be due to the existing leakage decrease.
  • the current pressure value P2 is detected in step 280.
  • the subsequent query 282 checks whether the pressure value P2 is greater than the pressure value P1 + ⁇ P. That is the query 282 checks to see if the pressure has occurred since the shutdown began has increased by more than a differential pressure ⁇ P. Alternatively, it can also be provided that query 282 queries whether the pressure P2 is greater than a threshold value.
  • step 285 checks whether the time t is greater than a value T2. Is if this is not the case, query 280 is repeated. If the Time condition expired, the program ends in step 287.
  • T1 occurs in a first time period Switching off the internal combustion engine the system into one brought defined state. During this period there is no verification. After this first Time period is the pressure control valve 40 in the sense of a controlled further pressure increase.
  • FIG 3 there are various signals over time t applied.
  • the signal at terminal 15 is in Sub-figure b, the control signal E for the ELAB and in Sub-figure c, the control signal DRV for the pressure control valve 40 applied.
  • the control signal AD is for applied the injectors.
  • Partial figure e shows the course of the pressure P in the rail when properly operated with a solid and with faulty operation with a dashed line.
  • the speed N is Internal combustion engine shown.
  • the signal at terminal 15 indicates that the internal combustion engine is running. Up to this point the ELAB is not controlled.
  • the DRV signal for control of the pressure control valve is at a value which is from Output of a pressure regulator, not shown, depends. The same applies to the control signal AD for the Injectors.
  • the value of the pressure P is also there to a value dependent on the previous operation.
  • the speed N is usually in the range of the idle speed.
  • the driver switches off the vehicle at time t0. For this he actuates switch 96, causing the clamp 15 is no longer energized and that signal KL15 drops. At the same time, the ELAB is controlled so that it closes. The signal E thus rises to its higher level. in the following the signals KL15 and E remain on the now reached value.
  • the control signal DRV increases by the value ⁇ DRV1.
  • the Control signal AD for the injectors remains on his old value.
  • the pressure P is reduced by a small amount increase, the increase for defective and non-defective ELAB differs only slightly.
  • the speed N also remains at its value because of the speed controller is still active.
  • the signal DRV to control the pressure regulating means 40 to the value DRV2 raised.
  • the control signal AD for the Injectors withdrawn to zero. This has the consequence that the speed slowly drops to zero. Is the ELAB in Order, the pressure P also drops to zero. Is this If the ELAB is defective, the pressure P increases according to the broken line drawn course, and exceeds at time t3 the value P1 + ⁇ P.

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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)
  • Fuel-Injection Apparatus (AREA)
EP98108227A 1997-06-20 1998-05-06 Méthode et dispositif pour la surveillance d'un système d'alimentation en carburant Expired - Lifetime EP0886056B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19726183 1997-06-20
DE19726183A DE19726183A1 (de) 1997-06-20 1997-06-20 Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems

Publications (2)

Publication Number Publication Date
EP0886056A1 true EP0886056A1 (fr) 1998-12-23
EP0886056B1 EP0886056B1 (fr) 2002-08-14

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EP98108227A Expired - Lifetime EP0886056B1 (fr) 1997-06-20 1998-05-06 Méthode et dispositif pour la surveillance d'un système d'alimentation en carburant

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EP (1) EP0886056B1 (fr)
JP (1) JPH1182248A (fr)
DE (2) DE19726183A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118761A3 (fr) * 2000-01-18 2002-02-06 C.R.F. Società Consortile per Azioni Méthode d'évaluation du fonctionnement du système d'injection à rampe d'alimentation d'un moteur à combustion interne
FR2812913A1 (fr) * 2000-08-14 2002-02-15 Bosch Gmbh Robert Procede et installation de diagnostic d'un composant de moteur a combustion interne
WO2002020970A1 (fr) * 2000-09-04 2002-03-14 Robert Bosch Gmbh Procede de diagnostic d'une soupape d'un systeme de ravitaillement en carburant d'une machine a combustion interne
WO2002055873A1 (fr) * 2001-01-10 2002-07-18 Robert Bosch Gmbh Systeme d'injection de carburant avec regulation de la pression dans la conduite de retour
WO2005001264A1 (fr) * 2003-06-30 2005-01-06 Siemens Aktiengesellschaft Procede de diagnostic d'une soupape de regulation de debit volumetrique dans un moteur a combustion equipe d'un systeme d'injection a accumulateur haute pression
WO2005052349A1 (fr) * 2003-11-28 2005-06-09 Robert Bosch Gmbh Dispositif pour transporter du carburant d'un reservoir vers un moteur a combustion interne et procede pour detecter la pression
WO2014008936A1 (fr) * 2012-07-12 2014-01-16 Wärtsilä Switzerland Ltd. Procédé de commande d'un injecteur défectueux
WO2016058733A1 (fr) * 2014-10-14 2016-04-21 Continental Automotive Gmbh Procédé de fonctionnement d'un système d'alimentation en carburant pour un moteur à combustion interne
CN108368792A (zh) * 2015-11-30 2018-08-03 罗伯特·博世有限公司 用于控制燃料供应***的方法和设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10215906A1 (de) * 2002-04-11 2003-10-23 Bayerische Motoren Werke Ag Dosierventilüberwachung
CN114017222A (zh) * 2021-10-14 2022-02-08 思达耐精密机电（常熟）有限公司 一种柴油机高压共轨自适应供油***和轨压控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802770A1 (de) 1988-01-30 1989-08-10 Bosch Gmbh Robert Sicherheitssystem fuer brennkraftmaschinen
DE3838267A1 (de) * 1988-11-11 1990-05-17 Bosch Gmbh Robert Verfahren und vorrichtung zur ueberwachung eines sicherheitsabstellers bei brennkraftmaschinen, insbesondere dieselmotoren
DE4401806A1 (de) * 1993-02-03 1994-08-04 Volkswagen Ag Verfahren zur Funktionsprüfung einer Abstellvorrichtung einer Einspritz-Brennkraftmaschine
WO1995006814A1 (fr) * 1993-09-03 1995-03-09 Robert Bosch Gmbh Methode de diagnostic de defaillances d'un circuit a haute pression d'un systeme d'injection a haute pression d'un moteur a combustion interne
DE19626689C1 (de) * 1996-07-03 1997-11-20 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Einspritzsystems

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19520300A1 (de) * 1995-06-02 1996-12-05 Bosch Gmbh Robert Einrichtung zur Erkennung eines Lecks in einem Kraftstoffversorgungssystem
DE19548280A1 (de) * 1995-12-22 1997-06-26 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802770A1 (de) 1988-01-30 1989-08-10 Bosch Gmbh Robert Sicherheitssystem fuer brennkraftmaschinen
US4905645A (en) 1988-01-30 1990-03-06 Robert Bosch Gmbh Safety system for internal combustion engines
DE3838267A1 (de) * 1988-11-11 1990-05-17 Bosch Gmbh Robert Verfahren und vorrichtung zur ueberwachung eines sicherheitsabstellers bei brennkraftmaschinen, insbesondere dieselmotoren
DE4401806A1 (de) * 1993-02-03 1994-08-04 Volkswagen Ag Verfahren zur Funktionsprüfung einer Abstellvorrichtung einer Einspritz-Brennkraftmaschine
WO1995006814A1 (fr) * 1993-09-03 1995-03-09 Robert Bosch Gmbh Methode de diagnostic de defaillances d'un circuit a haute pression d'un systeme d'injection a haute pression d'un moteur a combustion interne
DE19626689C1 (de) * 1996-07-03 1997-11-20 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Einspritzsystems

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118761A3 (fr) * 2000-01-18 2002-02-06 C.R.F. Società Consortile per Azioni Méthode d'évaluation du fonctionnement du système d'injection à rampe d'alimentation d'un moteur à combustion interne
US6502551B2 (en) 2000-01-18 2003-01-07 C.R.F. Societa Consortile Per Azioni Method of assessing operation of an internal combustion engine common-rail injection system
FR2812913A1 (fr) * 2000-08-14 2002-02-15 Bosch Gmbh Robert Procede et installation de diagnostic d'un composant de moteur a combustion interne
WO2002020970A1 (fr) * 2000-09-04 2002-03-14 Robert Bosch Gmbh Procede de diagnostic d'une soupape d'un systeme de ravitaillement en carburant d'une machine a combustion interne
WO2002055873A1 (fr) * 2001-01-10 2002-07-18 Robert Bosch Gmbh Systeme d'injection de carburant avec regulation de la pression dans la conduite de retour
US6729309B2 (en) 2001-01-10 2004-05-04 Robert Bosch Gmbh Fuel-injection system comprising pressure regulation in the return line
WO2005001264A1 (fr) * 2003-06-30 2005-01-06 Siemens Aktiengesellschaft Procede de diagnostic d'une soupape de regulation de debit volumetrique dans un moteur a combustion equipe d'un systeme d'injection a accumulateur haute pression
US7389767B2 (en) 2003-06-30 2008-06-24 Siemens Aktiengesellschaft Method for diagnosis of a volume flow control valve in an internal combustion engine comprising a high-pressure accumulator injection system
WO2005052349A1 (fr) * 2003-11-28 2005-06-09 Robert Bosch Gmbh Dispositif pour transporter du carburant d'un reservoir vers un moteur a combustion interne et procede pour detecter la pression
US7383821B2 (en) 2003-11-28 2008-06-10 Robert Bosch Gmbh Apparatus for pumping fuel from a tank to an internal combustion engine, and method for pressure detection
WO2014008936A1 (fr) * 2012-07-12 2014-01-16 Wärtsilä Switzerland Ltd. Procédé de commande d'un injecteur défectueux
WO2016058733A1 (fr) * 2014-10-14 2016-04-21 Continental Automotive Gmbh Procédé de fonctionnement d'un système d'alimentation en carburant pour un moteur à combustion interne
US10309335B2 (en) 2014-10-14 2019-06-04 Continental Automotive Gmbh Fuel-supply system for an internal combustion engine
CN108368792A (zh) * 2015-11-30 2018-08-03 罗伯特·博世有限公司 用于控制燃料供应***的方法和设备

Also Published As

Publication number Publication date
JPH1182248A (ja) 1999-03-26
DE59805158D1 (de) 2002-09-19
DE19726183A1 (de) 1998-12-24
EP0886056B1 (fr) 2002-08-14

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