EP1711704B1 - Procede pour surveiller le bon fonctionnement d'un systeme d'injection de carburant - Google Patents

Procede pour surveiller le bon fonctionnement d'un systeme d'injection de carburant Download PDF

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Publication number
EP1711704B1
EP1711704B1 EP06704233A EP06704233A EP1711704B1 EP 1711704 B1 EP1711704 B1 EP 1711704B1 EP 06704233 A EP06704233 A EP 06704233A EP 06704233 A EP06704233 A EP 06704233A EP 1711704 B1 EP1711704 B1 EP 1711704B1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
pressure accumulator
accumulator
control unit
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 - Fee Related
Application number
EP06704233A
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German (de)
English (en)
Other versions
EP1711704B8 (fr
EP1711704A1 (fr
Inventor
Carl-Eike Hofmeister
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.)
Continental Automotive GmbH
Original Assignee
Siemens VDO Automotive AG
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 Siemens VDO Automotive AG filed Critical Siemens VDO Automotive AG
Publication of EP1711704A1 publication Critical patent/EP1711704A1/fr
Application granted granted Critical
Publication of EP1711704B1 publication Critical patent/EP1711704B1/fr
Publication of EP1711704B8 publication Critical patent/EP1711704B8/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/003—Measuring variation of fuel pressure in high pressure line
    • 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
    • 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
    • F02D2041/225—Leakage detection
    • 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
    • F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions

Definitions

  • the invention relates to a method for monitoring the operability of a fuel injection system according to claim 1.
  • a fuel supply system for an internal combustion engine of a motor vehicle in which fuel is pumped by a pump in a pressure accumulator.
  • injection valves are connected, which supply the fuel of the internal combustion engine according to a control by a control unit.
  • the control unit causes a pressure change in the pressure accumulator. Subsequently, the time required to set the pressure change is detected. The recorded time is compared with experimentally determined time values and an error is concluded if the recorded time values do not correspond to the stored time values.
  • the object of the invention is to provide an improved method for monitoring the operability of a fuel injection system.
  • the object of the invention is solved by the features of claim 1.
  • the method according to claim 1 has the advantage that an analysis of the cause of the error is carried out and a more accurate determination of the error source is made possible.
  • the leaktightness of the injection system is recognized as a source of error if the setpoint pressure in the accumulator is undershot during a change in the injection quantity and a constant pressure is established in the pressure accumulator. In this way, leaks in the pressure system of the injection system can be accurately detected. Thus, corresponding emergency programs can be processed by the control unit.
  • the fuel supply is detected as a source of error in a change in the injection quantity and a fall below the target pressure in the pressure accumulator and a contrary to the change in the injection quantity changing fuel pressure in the pressure accumulator.
  • the pressure in the pressure accumulator is detected after a change in the injection quantity over a period of 1 sec., And the pressure detected during the measuring time is compared with a desired value or setpoint course. Due to the longer period of time short-term errors that may occur, for example due to defective injectors, averaged out. This will only detect faults caused by the injection system and not by the injectors.
  • FIG. 1 shows a schematic representation of a fuel injection system for an internal combustion engine, in particular a common rail injection system.
  • the injection system has a high-pressure accumulator 1, which is connected to injection valves 2.
  • the high-pressure accumulator 1 is connected via a feed line 3 to a fuel supply system 4.
  • the fuel supply system is connected to a fuel tank 5.
  • a control unit 6 is provided, which controls the fuel supply system 4 and the injection valves 2 as a function of operating conditions of an internal combustion engine 8.
  • the control unit 6 has a data memory 7 in which corresponding control programs are stored.
  • a control line 11 is provided between the control unit 6 and the fuel supply system 4.
  • 8 sensors 9 are arranged on the internal combustion engine, which detect the operating conditions of the internal combustion engine 8. As operating conditions are For example, the speed and accelerator pedal position determined and forwarded to the control unit 6.
  • control lines between the injection valves 2 and the control unit 6 for controlling the injection valves 2 are formed.
  • a pressure sensor 10 is provided on the high pressure accumulator 1, which detects the fuel pressure in the high pressure accumulator 1 and forwards it to the control unit 6.
  • the task of the fuel supply system 4 is to supply the high-pressure accumulator 1 with fuel according to the control by the control unit 6 with a desired setpoint pressure.
  • the fuel supply system 4 may have various components.
  • the fuel supply system 4 includes a fuel pump 12 and an inflow control valve 13 interposed between the fuel tank 5 and the fuel pump 12.
  • a pressure valve 14 is connected, the output of which is connected to a return line 15.
  • a flow cross-section of the inflow control valve 13 is opened up by the control unit 6 to a greater or lesser extent, so that more or less fuel can be conveyed into the high-pressure accumulator 1 by the fuel pump 12.
  • the pressure valve 14 is available, which is also controlled by the control unit 6. If the pressure valve 14 is opened by the control unit 6, then fuel which has already been compressed by the fuel pump 12 and pumped into the supply line 3 is conveyed via the return line 15 back into the fuel tank 5. Thus, the fuel pressure in the high-pressure accumulator 1 is lowered.
  • the fuel supply is dependent on specified control programs depending on operating conditions of the internal combustion engine 8 to the high-pressure accumulator 1, the fuel pressure in the high-pressure accumulator 1 and the amount of fuel discharged from the injectors 2 set.
  • the fuel pressure with which the fuel is injected is an essential feature for the exhaust quality of the internal combustion engine and therefore must be precisely adhered to.
  • the fuel pressure in the high-pressure accumulator is also a measurement signal that can be used for an error analysis of the injection system.
  • FIG. 2 shows in an upper diagram the time profile of the amount of fuel that is discharged from the injectors 2.
  • the course of the pressure in the high-pressure accumulator 1, which is detected by the pressure sensor 10 is plotted in parallel over time.
  • the upper diagram shows that the fuel quantity at time t0 falls from an upper value to a lower value at time t1 and then increases again to a higher value at time t2, again to fall to a lower value at time t3.
  • the time between the 0th time t0 and the third time t3 is longer than 1 second.
  • both the nominal value of the fuel pressure and the measured pressure p are plotted over time in the lower diagram.
  • the desired value is predetermined by control programs depending on operating conditions of the internal combustion engine.
  • the controller 6 controls the fuel supply system 4 so that the target pressure is adjusted. From the lower diagram, it can be seen that during the measurement period, i. H. From the 0th time to the third time t3, the detected pressure value p remains almost constant and is below the target pressure.
  • control unit 6 detects that a malfunction of the fuel supply system 4 is present. Furthermore, that recognizes Control unit 6 due to the present situation that the injected fuel quantity changes over time and the pressure prevailing in the high-pressure accumulator 1 fuel pressure remains almost constant and below the target pressure that there is a malfunction of the pressure valve. For the detection of a nearly constant pressure, a pressure range of, for example, 3% is set, in which the pressure in the high-pressure accumulator 1 can change during the measurement, but the control unit 6 nevertheless detects a constant fuel pressure in the high-pressure accumulator 1.
  • an appropriately prepared emergency program is used by the control unit 6 for the further control of the fuel supply system 4 and / or the injection valves 2.
  • the emergency program is stored in the memory 7 of the control unit 6.
  • FIG. 3 shows in the upper diagram again the change over time of the fuel injected from the injectors 2 amount of fuel.
  • the setpoint of the fuel pressure and the measured fuel pressure p are plotted in parallel over time.
  • the fuel injected from the injectors 2 is decreased in the amount from the time t0 from a high value to a lower value at the first time t1, then increased again to a higher value at the second time t2 and then again to a lower value lowered at the third time t3.
  • the period between the 0th time t0 and the third time t3 corresponds to approximately 1 second.
  • the time course of the measured pressure in the high pressure accumulator 1 has a pressure change opposite to the pressure change, ie, while the injected fuel quantity decreases, the fuel pressure in the high pressure accumulator decreases 1 to and vice versa.
  • the control unit 6 clearly detects a malfunction of the inflow control valve 13.
  • a corresponding emergency program for the further control of the feed system 4 and / or the injection valves 2 is used by the control unit 6.
  • the emergency program which is used in a malfunction of the inflow control valve, for example, reduces the amount of fuel to be injected from the injectors 2.
  • the desired value of the pressure is also limited.

Landscapes

  • 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 pour surveiller le bon fonctionnement d'un système d'injection d'un moteur à combustion interne. Lorsque la quantité de carburant injecté varie, une source d'erreurs est détectée en fonction du comportement de la pression régnant dans le réservoir haute pression. Un programme de commande d'urgence correspondant est exécuté par l'appareil de commande, en fonction de la source d'erreurs détectée. Le procédé selon l'invention permet d'analyser une source d'erreurs de manière simple et précise.

Claims (5)

  1. Procédé pour contrôler un bon fonctionnement d'un système d'injection d'un moteur à combustion interne, comprenant un accumulateur de pression (1), une soupape d'injection (2) raccordée à l'accumulateur de pression, un système d'arrivée de carburant (4) réglable, qui alimente l'accumulateur de pression (1) en carburant, un capteur de pression (10), qui est raccordé à l'accumulateur de pression (1) et enregistre la pression dans l'accumulateur de pression, un appareil de commande (6) auquel la pression dans l'accumulateur de pression est amenée par le capteur de pression (10) et la quantité de carburant évacuée par la soupape d'injection (2) et la quantité de carburant amenée par le système d'arrivée de carburant sont commandées en fonction de paramètres de service du moteur à combustion interne, la quantité de carburant à fournir par la soupape d'injection (2) étant modifiée, caractérisé en ce que la pression s'établissant alors est enregistrée, la pression s'établissant étant comparée avec une pression de consigne pour les conditions de service données, et une source d'erreur étant identifiée en fonction de l'écart de la pression mesurée par rapport à la valeur de comparaison et en cas de sous-dépassement de la pression de consigne.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans le cas d'une variation de la quantité injectée, dans le cas d'un sous-dépassement de la pression de consigne dans l'accumulateur de pression (1) et dans le cas d'une pression approximativement constante dans l'accumulateur de pression (1), on identifie comme source d'erreur une soupape de pression (14) raccordée à l'accumulateur de pression qui ne peut pas régler la pression souhaitée.
  3. Procédé selon la revendication 1, caractérisé en ce que, dans le cas d'une variation de la quantité injectée, dans le cas d'un sous-dépassement de la pression de consigne dans l'accumulateur de pression (1) et dans le cas d'une pression de carburant dans l'accumulateur de pression (1) variant dans le sens contraire à la variation de la quantité injectée, on identifie comme source d'erreur le système d'arrivée de carburant (6) qui n'amène pas suffisamment de carburant.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la pression est enregistrée pendant un temps de mesure de 1 seconde et le comportement dans le temps de la pression est comparé pendant le temps de mesure avec une courbe de valeurs de consigne.
  5. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que, en fonction du défaut détecté, on utilise un programme de secours approprié pour la commande par l'appareil de commande, de sorte que les programmes de secours appropriés pour les divers défauts sont mis à disposition pour l'appareil de commande.
EP06704233A 2005-01-31 2006-01-20 Procede pour surveiller le bon fonctionnement d'un systeme d'injection de carburant Expired - Fee Related EP1711704B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005004423A DE102005004423B3 (de) 2005-01-31 2005-01-31 Verfahren zum Überwachen der Funktionsfähigkeit eines Kraftstoffeinspritzsystems
PCT/EP2006/050334 WO2006079606A1 (fr) 2005-01-31 2006-01-20 Procede pour surveiller le bon fonctionnement d'un systeme d'injection de carburant

Publications (3)

Publication Number Publication Date
EP1711704A1 EP1711704A1 (fr) 2006-10-18
EP1711704B1 true EP1711704B1 (fr) 2008-03-05
EP1711704B8 EP1711704B8 (fr) 2008-04-23

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EP06704233A Expired - Fee Related EP1711704B8 (fr) 2005-01-31 2006-01-20 Procede pour surveiller le bon fonctionnement d'un systeme d'injection de carburant

Country Status (5)

Country Link
US (1) US7444993B2 (fr)
EP (1) EP1711704B8 (fr)
CN (1) CN100434683C (fr)
DE (2) DE102005004423B3 (fr)
WO (1) WO2006079606A1 (fr)

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Also Published As

Publication number Publication date
CN100434683C (zh) 2008-11-19
EP1711704B8 (fr) 2008-04-23
DE102005004423B3 (de) 2006-06-14
US20080109144A1 (en) 2008-05-08
WO2006079606A1 (fr) 2006-08-03
CN1942663A (zh) 2007-04-04
DE502006000413D1 (de) 2008-04-17
US7444993B2 (en) 2008-11-04
EP1711704A1 (fr) 2006-10-18

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