EP3234328B1 - Procédé et appareil pour diagnostiquer un systeme d'alimentation en carburant - Google Patents

Procédé et appareil pour diagnostiquer un systeme d'alimentation en carburant Download PDF

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Publication number
EP3234328B1
EP3234328B1 EP15788063.4A EP15788063A EP3234328B1 EP 3234328 B1 EP3234328 B1 EP 3234328B1 EP 15788063 A EP15788063 A EP 15788063A EP 3234328 B1 EP3234328 B1 EP 3234328B1
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EP
European Patent Office
Prior art keywords
pressure
controllable valve
reached
fuel accumulator
fuel
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EP15788063.4A
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German (de)
English (en)
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EP3234328A1 (fr
Inventor
Patrick Weiss
Yiping Chen
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Robert Bosch GmbH
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Robert Bosch GmbH
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Classifications

    • 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
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • 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
    • F02D41/30—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
    • 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
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • 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
    • F02D41/24—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 for testing a fuel delivery device, in particular an electrically controlled actuator, and a control device and a workshop tester.
  • a method for monitoring an injection system of an internal combustion engine is known.
  • the injection system has a fuel accumulator and a controlled metering unit for controlling the fuel delivery quantity into the fuel accumulator.
  • Known methods of this type evaluate a signal, which represents the time course of the pressure in the fuel accumulator, with regard to a possible defect in a component of the injection system. In order to be able to conclude that the metering unit is defective, the metering unit is increasingly closed or opened during the evaluation of the signal representing the pressure in the fuel accumulator.
  • EP 1 279 822 A2 discloses a method of diagnosing a fuel delivery system wherein the pressure in the fuel accumulator is controlled.
  • Conventional test methods offer the possibility of a two-digit system, which is a first electrically controlled one Actuator in front of the high pressure pump and a pressure control valve on the high pressure accumulator to check for a defect in the first electrical actuator.
  • the first electrically controlled actuator can be checked for any operating points, since excess fuel can be controlled via the pressure control valve.
  • the electrically controlled actuator can only be tested in a limited operating range when installed in the vehicle. If faults occur outside of this operating range, this cannot be diagnosed in the workshop. In order to avoid that a fault is not recognized correctly, the method according to the invention offers the possibility of testing the electrically controlled actuator in all operating areas.
  • control device for carrying out the inventive method is claimed, as well as a motor tester, which requests the inventive method on a control device.
  • the object is achieved by an inventive method according to one of the independent claims 1 or 7 and by an inventive control device according to the independent patent claim 10, and a motor tester according to the independent claim 11.
  • the further variable is the pressure difference between the first low pressure level and a maximum value of the pressure or if the further variable is the time which is required until the pressure has risen from the first low pressure level to the maximum value of the pressure.
  • a deviation of the pressure difference and / or the time from the respective stored characteristic map provides a simple and advantageous way of inferring an error in the controllable valve.
  • the controllable valve does not have to be removed to check a fault, which reduces both time and costs in the workshop.
  • the pressure in the fuel accumulator for process steps 2.) and 4.) is set via the pressure regulator, which supplies the control unit with information about the pressure in the fuel accumulator, so that it controls the controllable valve.
  • control is used for the terms known and regulated in control engineering.
  • FIG. 1 shows a schematic representation of a fuel delivery device 10 with a control device 11 according to an embodiment of the present invention. Only the components that are important for understanding the invention are shown.
  • a prefeed pump 12 draws fuel from a tank 14 via an inlet line 13.
  • the prefeed pump 12 supplies a controllable valve 15 with fuel.
  • the controllable valve 15 controls the supply of a high pressure pump 16 Amount of fuel.
  • the high-pressure pump 16 delivers the fuel supplied to it under high pressure into the fuel accumulator 17. In the fuel accumulator 17, the pressure is controlled by a pressure regulator 20.
  • the fuel in the fuel accumulator 17 is also fed via a high-pressure line 22 to at least one injector 23, which injects fuel into at least one cylinder, not shown, of an internal combustion engine.
  • a quantity of fuel required for the operation of the injectors 23 is likewise returned to the tank 14 via a fuel return line 21.
  • a control device 11 controls the controllable valve 15 via an electrical control line 25. Furthermore, the control unit 11 receives the pressure in the fuel accumulator 17 measured by the pressure regulator 20 via an electrical control line 26. The control unit 11 controls the injectors 23 via an electrical control line 27. The control unit 11 also contains software for controlling the engine during operation and software for executing the method according to the invention for testing the controllable valve 15. The control of the engine is carried out by electrically actuating the electrically controlled actuator, namely the controllable valve 15, on the input side of the high-pressure pump 16.
  • Figure 2 shows a flowchart diagram which describes the method according to the invention.
  • the object of the method according to the invention is to test the electrically actuated actuator in a workshop without the electrically actuated actuator having to be removed.
  • controllable valve 15 Before the actual test procedure begins, all functionalities that can falsify the result of the test of the controllable valve 15 can optionally be blocked in process step 31.
  • This can e.g. be a particle regenerator, which is switched off during the test.
  • the speed of the high-pressure pump 16 is increased sharply in order to achieve a high delivery rate of the high-pressure pump 16 and a high injection rate of the at least one injector 23.
  • the speed is usually increased while idling.
  • the procedure can but also with a load, which must be identical throughout the entire process.
  • controllable valve 15 is activated such that the pressure in the fuel accumulator 17 drops until the pressure in the fuel accumulator 17 has reached a first low pressure level.
  • the controllable valve 15 is controlled via the control unit 11, which receives information about the pressure in the fuel accumulator 17 from the pressure regulator 20. For this reason, the pressure in method step 33 is set via the pressure regulator 20.
  • the pressure regulator 20 it is possible for the pressure regulator 20 to be connected directly to the controllable valve 15 and to control it until a desired pressure, which corresponds to the first low pressure level, is established in the fuel accumulator 17.
  • the energization of the controllable valve 15 is changed by the control device 11 by a first predetermined value, so that the controllable valve 15 is opened further.
  • the energization can be increased or decreased in order to achieve a further opening of the controllable valve 15.
  • a possible value of 50 mA can be used here, by which the current of the controllable valve 15 can be raised or lowered.
  • an injection quantity is maximized by the at least one injector 23.
  • the changed energization of the controllable valve 15 and the maximization of the injection quantity of the at least one injector 23 are maintained until the pressure in the fuel accumulator 17 has reached a first threshold value.
  • controllable valve 15 is activated such that the pressure in the fuel accumulator 17 drops until the pressure in the fuel accumulator 17 has reached the first low pressure level.
  • the controllable valve 15 is activated in method step 35 analogously to method step 33.
  • a further variable is determined in method step 36, which is dependent on the first low pressure level and a maximum value of the pressure.
  • the maximum value is usually above the first threshold and is due to inertia effects of the fuel injection system 10 conditional. Closing the controllable valve 15 shows an effect on the pressure in the fuel accumulator 17 only after a certain time delay, so that the pressure in the fuel accumulator 17 increases even after the threshold value has been reached until the maximum value is reached.
  • the further size can be a pressure difference between the first low pressure level and the maximum value of the pressure.
  • the further quantity can also be the time which is required until the pressure has risen from the first low pressure level to the maximum value of the pressure.
  • method step 37 a comparison of the further size, which was determined in method step 36, with a stored characteristic map of the further size of the controllable valve 15 takes place.
  • a deviation of the pressure difference and / or the time from the respective stored map can give an indication of a fault in the controllable valve 15.
  • controllable valve 15 has a fault, such as a jamming component, the measured pressure difference and / or the measured time do not match the stored characteristic curve.
  • the method steps 32 to 37 can be repeated several times, the energization of the controllable valve 15 being changed by the same value, which corresponds to the value specified in the first pass.
  • a comparison of the further size between the respective repetitions can take place here.
  • the value of the additional size differs between repetitions from each other, although the boundary conditions were the same (for example, the same change in the current supply), there is a fault in the controllable valve 15.
  • the energization could be reduced or increased by 50 mA
  • the energization could be reduced or increased by 100 mA
  • the current is reduced or increased by 150mA, etc.
  • the method according to the invention is carried out by a control unit 11, which is connected to the controllable valve 15 and the pressure regulator 20 via electrical control lines 25, 26. Furthermore, software is stored on the control unit 11 and data on the characteristic diagram of the respective controllable valve.
  • the method according to the invention is requested by a workshop tester, who can establish a connection with the control unit 11 via any interface.
  • the results of the method according to the invention are transmitted to the workshop tester by the control unit 11.

Claims (11)

  1. Procédé pour tester un actionneur à commande électrique dans un dispositif de refoulement de carburant (10) d'un moteur à combustion interne, dans lequel l'actionneur électrique est une vanne réglable (15) qui est disposée à l'entrée d'une pompe à haute pression (16), dans lequel la pompe à haute pression (16) refoule du carburant dans un réservoir de carburant (17) pourvu d'un régulateur de pression (20) et le réservoir de carburant (17) est relié à au moins un injecteur (23), caractérisé par les étapes suivantes :
    1) augmenter la vitesse de rotation de la pompe à haute pression (16),
    2) commander la vanne réglable (15) jusqu'à ce que la pression dans le réservoir de carburant (17) ait atteint un premier niveau de pression bas,
    3) faire varier l'alimentation en courant de la vanne réglable (15) d'une première valeur prescrite de manière à ouvrir davantage la vanne réglable (15) et à simultanément augmenter au maximum une quantité d'injection par l'intermédiaire dudit au moins un injecteur (23) jusqu'à ce que la pression dans le réservoir de carburant (17) ait atteint une première valeur de seuil,
    4) commander la vanne réglable (15) jusqu'à ce que la pression dans le réservoir de carburant (17) revienne au premier niveau de pression bas,
    5) déterminer une autre grandeur qui est fonction du premier niveau de pression bas et d'une valeur maximale de la pression qui a été atteinte dans le réservoir de carburant (17) après que la valeur de seuil a été atteinte,
    6) comparer l'autre grandeur à un diagramme caractéristique stocké pour la vanne réglable (15), dans lequel un écart par rapport au diagramme caractéristique stocké donne une indication de défaut.
  2. Procédé selon la revendication 1, dans lequel l'autre grandeur est la différence de pression entre le premier niveau de pression bas et une valeur maximale de la pression.
  3. Procédé selon la revendication 1, dans lequel l'autre grandeur est le temps nécessaire pour que la pression s'élève du premier niveau de pression bas à la valeur maximale de la pression.
  4. Procédé selon la revendication 1, dans lequel les étapes 1) à 6) sont répétées plusieurs fois et l'alimentation en courant de la vanne réglable (15) est amenée à varier de la même valeur, qui correspond à la première valeur prédéterminée.
  5. Procédé selon la revendication 1, dans lequel les étapes 1) à 6) sont répétées plusieurs fois et l'alimentation en courant de la vanne réglable (15) est respectivement amenée à varier d'une quantité différente.
  6. Procédé selon la revendication 5, dans lequel le courant est augmenté ou diminué de la même quantité lors de chaque répétition.
  7. Procédé pour tester un actionneur à commande électrique dans un dispositif de refoulement de carburant (10) d'un moteur à combustion interne, dans lequel l'actionneur électrique est une vanne réglable (15) qui est disposée à l'entrée d'une pompe à haute pression (16), dans lequel la pompe à haute pression (16) refoule du carburant dans un réservoir de carburant (17) pourvu d'un régulateur de pression (20) et le réservoir de carburant (17) est relié à au moins un injecteur (23), caractérisé par les étapes suivantes :
    1) augmenter la vitesse de rotation de la pompe à haute pression (16),
    2) commander la vanne réglable (15) jusqu'à ce que la pression dans le réservoir de carburant (17) ait atteint un premier niveau de pression bas,
    3) faire varier l'alimentation en courant de la vanne réglable (15) d'une première valeur prescrite de manière à ouvrir davantage la vanne réglable (15) et à simultanément augmenter au maximum une quantité d'injection par l'intermédiaire dudit au moins un injecteur (23) jusqu'à ce que la pression dans le réservoir de carburant (17) ait atteint une première valeur de seuil,
    4) commander la vanne réglable (15) jusqu'à ce que la pression dans le réservoir de carburant (17) revienne au premier niveau de pression bas,
    5) déterminer une autre grandeur qui est fonction du premier niveau de pression bas et d'une valeur maximale de la pression qui a été atteinte dans le réservoir de carburant (17) après que la valeur de seuil a été atteinte, dans lequel les étapes 1) à 5) sont répétées plusieurs fois et l'alimentation en courant de la vanne réglable (15) est respectivement amenée à varier de la même valeur qui correspond à la première valeur prescrite, dans lequel un écart de l'autre grandeur entre les répétitions donne une indication d'un défaut de la vanne réglable (15).
  8. Procédé selon l'une des revendications précédentes, dans lequel la pression est réglée aux étapes 2) et 4) par l'intermédiaire du régulateur de pression (20).
  9. Procédé selon l'une des revendications précédentes, dans lequel, avant l'étape 1), des fonctionnalités qui peuvent fausser le résultat du procédé sont bloquées.
  10. Appareil de commande (11) destiné à mettre en œuvre le procédé selon l'une des revendications 1 à 9.
  11. Testeur d'atelier faisant appel au procédé selon l'une des revendications 1 à 9 sur l'appareil de commande (11) selon la revendication 10, qui a établi une connexion avec l'appareil de commande (11) de la revendication 10 par l'intermédiaire d'une interface quelconque, et dans lequel les résultats du procédé selon l'une des revendications 1 à 9 sont transmis par l'appareil de commande au testeur d'atelier.
EP15788063.4A 2014-12-19 2015-11-03 Procédé et appareil pour diagnostiquer un systeme d'alimentation en carburant Active EP3234328B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014226565.7A DE102014226565A1 (de) 2014-12-19 2014-12-19 Verfahren zur Prüfung einer Kraftstofffördereinrichtung, sowie ein Steuergerät und ein Werkstatt-Tester
PCT/EP2015/075538 WO2016096229A1 (fr) 2014-12-19 2015-11-03 Procédé et dispositif de diagnostic d'un système de refoulement de carburant

Publications (2)

Publication Number Publication Date
EP3234328A1 EP3234328A1 (fr) 2017-10-25
EP3234328B1 true EP3234328B1 (fr) 2020-08-05

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EP15788063.4A Active EP3234328B1 (fr) 2014-12-19 2015-11-03 Procédé et appareil pour diagnostiquer un systeme d'alimentation en carburant

Country Status (5)

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US (1) US10400731B2 (fr)
EP (1) EP3234328B1 (fr)
CN (1) CN107110101B (fr)
DE (1) DE102014226565A1 (fr)
WO (1) WO2016096229A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10352266B2 (en) * 2017-05-11 2019-07-16 Ford Global Technologies, Llc Method of fuel injection control in diesel engines
DE102019204482A1 (de) * 2019-03-29 2020-10-01 Robert Bosch Gmbh Verfahren zur Prüfung eines Injektors

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Publication number Priority date Publication date Assignee Title
IT1319633B1 (it) * 2000-01-18 2003-10-20 Fiat Ricerche Metodo di valutazione della funzionalita' di un impianto di iniezionea collettore comune di un motore a combustione interna.
DE10136179A1 (de) 2001-07-25 2003-02-13 Bosch Gmbh Robert Verfahren zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE10349628A1 (de) * 2003-10-24 2005-06-02 Robert Bosch Gmbh Verfahren zum Regeln des Druckes in einem Kraftstoffspeicher einer Brennkraftmaschine
DE10354656B4 (de) 2003-11-22 2018-02-08 Robert Bosch Gmbh Verfahren zum Überwachen eines Einspritzsystems einer Brennkraftmaschine
DE102004040706B4 (de) * 2004-08-19 2010-05-06 Audi Ag Verfahren zur Diagnose des Kraftstoffversorgungssystems einer Brennkraftmaschine
DE602007006656D1 (de) 2007-07-05 2010-07-01 Magneti Marelli Powertrain Spa Verfahren zur Steuerung eines Überdruckventils in einem Common-Rail-Kraftstoffversorgungssystem
DE102011005527A1 (de) 2011-03-15 2012-09-20 Robert Bosch Gmbh Verfahren zur Prüfung der Kraftstoffmengenbilanz in einem Common Rail System, entsprechende Motorsteuerung sowie entsprechendes Diagnosegerät
DE102014217443A1 (de) * 2014-09-01 2016-03-03 Robert Bosch Gmbh Prüfablauf für Hochdruckpumpen

Non-Patent Citations (1)

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Publication number Publication date
CN107110101B (zh) 2019-11-26
US20170350359A1 (en) 2017-12-07
US10400731B2 (en) 2019-09-03
CN107110101A (zh) 2017-08-29
EP3234328A1 (fr) 2017-10-25
DE102014226565A1 (de) 2016-06-23
WO2016096229A1 (fr) 2016-06-23

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