EP3234328A1 - Procédé et dispositif de diagnostic d'un système de refoulement de carburant - Google Patents

Procédé et dispositif de diagnostic d'un système de refoulement de carburant

Info

Publication number
EP3234328A1
EP3234328A1 EP15788063.4A EP15788063A EP3234328A1 EP 3234328 A1 EP3234328 A1 EP 3234328A1 EP 15788063 A EP15788063 A EP 15788063A EP 3234328 A1 EP3234328 A1 EP 3234328A1
Authority
EP
European Patent Office
Prior art keywords
pressure
controllable valve
fuel
reached
low pressure
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
EP15788063.4A
Other languages
German (de)
English (en)
Other versions
EP3234328B1 (fr
Inventor
Patrick Weiss
Yiping Chen
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 EP3234328A1 publication Critical patent/EP3234328A1/fr
Application granted granted Critical
Publication of EP3234328B1 publication Critical patent/EP3234328B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • 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 in the fuel storage.
  • Known methods of this type evaluate a signal representing the time course of the pressure in the fuel storage, with regard to a possible defect of a component of the injection system.
  • the metering unit is increasingly closed or opened during the evaluation of the signal representing the pressure in the fuel storage.
  • Conventional test methods offer the possibility of a two-digit system, which generates a first electrically controlled tes actuator in front of the high-pressure pump and a pressure control valve on the high-pressure accumulator has to check with respect to a defect of the first electric actuator.
  • the first electrically controlled actuator can be checked for any desired operating points, since excess fuel can be deactivated via the pressure regulating valve.
  • the electrically controlled actuator can be tested so far in the vehicle installed state only in a limited operating range. If errors occur outside this operating range, this can not be diagnosed in the workshop. In order to avoid that an error is not recognized correctly, the method according to the invention offers the possibility of testing the electrically actuated actuator in all operating ranges.
  • control unit for carrying out the inventive method is claimed, as well as a motor tester, which requests the inventive method on a control unit.
  • the object is achieved by an inventive method according to the independent claim 1 and by an inventive control device according to the independent patent claim 11, and a motor tester according to the independent claim 11.
  • the inventive method comprises the following steps:
  • the further variable is the pressure difference between the first low pressure level and a maximum value of the pressure, or if the further amount is the time required for the pressure to increase 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 map gives a simple and advantageous way to an error of the controllable valve.
  • the controllable valve does not need to be removed to verify a fault, which reduces both time and cost in the workshop.
  • Repeating steps 1) through 5) several times during a check of the controllable valve is advantageous because the repetitions increase the accuracy of the test and also detect an error that occurs with less likelihood.
  • a multiple repetition of steps 1) to 5), wherein the current flow of the controllable valve is changed by a different value, is advantageous because a wider range of operating conditions can be examined and thus an error, possibly only in a certain operating condition occurring with higher probability can be found.
  • a simple possibility here is to change the current at each repetition by the same amount.
  • the pressure in the fuel tank for the process steps 2) and 4) is set via the pressure regulator, which supplies the control unit with information about the pressure in the fuel reservoir, so that it controls the controllable valve.
  • control In the context of this application, the term is used to control or control for the terms known in the control engineering terms control and regulating used.
  • Figure 1 shows a fuel delivery device in a schematic representation
  • FIG. 2 shows a flowchart of the method according to a first embodiment of the present invention.
  • FIG. 1 shows a schematic representation of a fuel delivery device 10 with a control unit 11 according to an embodiment of the present invention. Only the components important for understanding the invention are shown.
  • a prefeed pump 12 sucks in fuel via a supply line 13 from a tank 14.
  • the prefeed pump 12 supplies a controllable valve 15 with fuel.
  • the controllable valve 15 controls that supplied to a high-pressure pump 16 Fuel quantity.
  • the high-pressure pump 16 conveys 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 reservoir 17 is further via a high-pressure line
  • injector 22 at least one injector 23, which injects fuel into at least one cylinder, not shown, of an internal combustion engine.
  • An amount of fuel required for the operation of the injectors 23 is also returned to the tank 14 via a fuel return line 21.
  • a control unit 11 controls the controllable valve 15 via an electrical control line 25. Furthermore, the control unit 11 receives via an electrical control line 26 the pressure in the fuel accumulator 17 measured by the pressure regulator 20. The control unit 11 controls the injectors 23 via an electrical control line 27.
  • the control unit 11 also includes a software for controlling the motor during operation and software for carrying out the method according to the invention for testing the controllable valve 15. The motor is controlled by electrical control of the electrically controlled actuator, namely the controllable valve 15, the input side of the high-pressure pump 16th
  • FIG. 2 shows a flow chart which describes the method according to the invention.
  • the object of the method according to the invention is to test the electrically controlled actuator in a workshop without having to remove the electrically controlled actuator.
  • step 31 all functionalities can optionally be blocked, which can falsify the result of the test of the controllable valve 15.
  • This can e.g. a particle regenerator, which is turned off during the test.
  • step 32 the speed of the high-pressure pump 16 is raised sharply in order to realize a high delivery rate of the high-pressure pump 16 and a high injection quantity of the at least one injector 23. Raising the speed usually takes place in workshop operation at idle. The procedure can but also at a load which must be identical throughout the process.
  • controllable valve 15 is actuated such that the pressure in fuel accumulator 17 decreases until the pressure in fuel accumulator 17 has reached a first low pressure level.
  • the control of the controllable valve 15 via the controller 11, which receives information about the pressure in the fuel tank 17 by the pressure regulator 20. For this reason, the pressure in 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 actuate it until a desired pressure, which corresponds to the first low pressure level, is established in the fuel reservoir 17.
  • step 34 the energization of the controllable valve 15 is changed by the control unit 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.
  • a maximization of an injection quantity by the at least one injector 23 takes place in method step 34.
  • the changed energization of the controllable valve 15 and the maximization of the injection quantity of the at least one injector 23 is maintained until the pressure in the fuel accumulator 17 has reached a first threshold value.
  • the controllable valve 15 is controlled so that the
  • Pressure in the fuel tank 17 decreases until the pressure in the fuel tank 17 has reached the first low pressure level.
  • the actuation of the controllable valve 15 takes place in method step 35 analogously to method step 33.
  • a further variable is determined, 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 value and is health effects of the fuel injection system 10 conditionally. Closing of the controllable valve 15 only after a certain time delay has an effect on the pressure in the fuel accumulator 17, so that the pressure in the fuel accumulator 17 still rises after reaching the threshold value until the maximum value is reached.
  • the further variable may be a pressure difference between the first low pressure level and the maximum value of the pressure.
  • the further variable may also be the time 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 variable, which was determined in method step 36, takes place with a stored characteristic map of the further variable of controllable valve 15.
  • a deviation of the pressure difference and / or the time of the respective stored characteristic map can give a conclusion to an error of the controllable valve 15.
  • controllable valve 15 has an error, such as, for example, a jamming component, then 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, wherein the energization of the controllable valve 15 in each case by the same value, which corresponds to the predetermined value in the first pass, is changed.
  • the current supply could be lowered or raised by 50 mA
  • the current in a second pass of the method steps 32 to 37 the current could be reversed
  • the energization could be lowered or raised by 150mA, etc ..
  • the inventive method is carried out by a control unit 11, which communicates via electrical control lines 25,26 with the controllable valve 15 and the pressure regulator 20 in connection. Furthermore, a software is stored on the control unit 11 and data on the map of the respective controllable valve.
  • the method according to the invention is requested by a workshop tester, which can record a connection to the control unit 11 via an arbitrary interface.
  • the results of the method according to the invention are transmitted by the control unit 11 to the workshop tester.

Landscapes

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

Abstract

L'invention concerne un procédé pour tester un actionneur à commande électrique dans un dispositif de refoulement de carburant (10) d'un moteur à combustion interne. L'actionneur électrique est une vanne réglable (15) qui est disposée à l'entrée d'une pompe à haute pression (16). La pompe à haute pression (16) refoule le carburant jusque dans un réservoir de carburant (17) pourvu d'un régulateur de pression (20). Le réservoir de carburant (17) est relié à au moins un injecteur (23). Le procédé comprend les étapes suivantes consistant à : 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 façon à ouvrir davantage la vanne réglable (15) et à simultanément augmenter au maximum une quantité d'injection à travers l'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, et 5) déterminer une nouvelle grandeur qui est fonction du faible niveau de pression et d'une valeur maximale de la pression qui a été atteinte dans le réservoir de carburant (17).
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 true EP3234328A1 (fr) 2017-10-25
EP3234328B1 EP3234328B1 (fr) 2020-08-05

Family

ID=54365269

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Country Link
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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
ATE468481T1 (de) 2007-07-05 2010-06-15 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

Also Published As

Publication number Publication date
CN107110101B (zh) 2019-11-26
CN107110101A (zh) 2017-08-29
EP3234328B1 (fr) 2020-08-05
DE102014226565A1 (de) 2016-06-23
US10400731B2 (en) 2019-09-03
WO2016096229A1 (fr) 2016-06-23
US20170350359A1 (en) 2017-12-07

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