EP3234328A1 - Method and device for diagnosing a fuel delivery system - Google Patents

Method and device for diagnosing a fuel delivery system

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)
French (fr)
Other versions
EP3234328B1 (en
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/en
Application granted granted Critical
Publication of EP3234328B1 publication Critical patent/EP3234328B1/en
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

The invention relates to a method for testing an electrically activated actuator in a fuel delivery device (10) of an internal combustion engine, wherein the electrical actuator is a controllable valve (15) that is arranged on the inlet side of a high-pressure pump (16). The high-pressure pump (16) conveys fuel into a fuel store (17) having a pressure controller (20). The fuel store (17) is connected to at least one injector (23). The method comprises the following steps: 1) increasing the rotational speed of the high-pressure pump (16), 2) activating the controllable valve (15) until the pressure in the fuel store (17) has reached a first low pressure level, 3) changing the supply of current to the controllable valve (15) by a first specified value such that the controllable valve (15) is opened further and simultaneously maximizing an injection amount by means of the at least one injector (23) until the pressure in the fuel store (17) has reached a first threshold value, 4) activating the controllable valve (15) until the pressure in the fuel store (17) has reached the first low pressure level again, 5) determining a further quantity, which depends on the low pressure level and a maximum value of the pressure that was reached in the fuel store (17).

Description

Beschreibung Titel  Description title
VERFAHREN UND VORRICHTUNG ZUR DIAGNOSE EINES KRAFTSTOFFFÖRDERSYSTEMS METHOD AND DEVICE FOR DIAGNOSIS OF A FUEL SUPPLY SYSTEM
Stand der Technik State of the art
Die Erfindung betrifft ein Verfahren zur Prüfung einer Kraftstofffördereinrichtung, insbesondere eines elektrisch angesteuerten Stellglieds, sowie ein Steuergerät und einen Werkstatt- Tester. 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.
Aus der DE 103 54 656 AI ist ein Verfahren zum Überwachen eines Einspritz- systems einer Brennkraftmaschine bekannt. Das Einspritzsystem weist einen Kraftstoffspeicher und eine gesteuerte Zumesseinheit zum Steuern der Kraftstoff- Fördermenge in den Kraftstoffspeicher auf. Bekannte Verfahren dieser Art werten ein Signal, welches den zeitlichen Verlauf des Druckes in dem Kraftstoffspeicher repräsentiert, im Hinblick auf einen möglichen Defekt einer Komponente des Einspritzsystems aus. Um gezielt auf einen Defekt der Zumesseinheit schließen zu können, wird die Zumesseinheit während der Auswertung des den Druck im Kraftstoffspeicher repräsentierten Signals zunehmend geschlossen oder geöffnet. From DE 103 54 656 AI 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. In order to be able to close specifically on a defect of the metering unit, the metering unit is increasingly closed or opened during the evaluation of the signal representing the pressure in the fuel storage.
Ein weiteres Verfahren zur Prüfung der Kraftstoffmengenbilanz in einem Common- Rail System mit zwei elektrisch angesteuerten Stellgliedern ist in der DE 10 2011 005 527 AI gezeigt. Another method for testing the fuel quantity balance in a common rail system with two electrically actuated actuators is shown in DE 10 2011 005 527 AI.
Offenbarung der Erfindung Disclosure of the invention
Es ist eine Aufgabe der Erfindung ein Verfahren zur Prüfung einer Kraftstofffördereinrichtung, insbesondere eines elektrisch angesteuerten Stellglieds einer Kraftstofffördereinrichtung, bereitzustellen. Herkömmliche Prüfverfahren bieten die Möglichkeit ein Zweisteller-System, welches ein erstes elektrisch angesteuer- tes Stellglied vor der Hochdruckpumpe und ein Druckregelventil am Hochdruckspeicher aufweist, im Bezug auf einen Defekt des ersten elektrischen Stellgliedes zu überprüfen. Hierbei kann das erste elektrisch angesteuerte Stellglied für alle beliebigen Betriebspunkte überprüft werden, da überschüssiger Kraftstoff über das Druckregelventil abgesteuert werden kann. It is an object of the invention to provide a method for testing a fuel delivery device, in particular an electrically controlled actuator of a fuel delivery device. 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. In this case, the first electrically controlled actuator can be checked for any desired operating points, since excess fuel can be deactivated via the pressure regulating valve.
Da in einem Einstellersystem ohne Druckregelventil diese Möglichkeit nicht gegeben ist, kann das elektrisch angesteuerte Stellglied bisher im im Fahrzeug eingebauten Zustand nur in einem eingeschränkten Betriebsbereich getestet werden. Treten Fehler außerhalb dieses Betriebsbereichs auf, kann dies in der Werkstatt nicht diagnostiziert werden. Um zu vermeiden, dass ein Fehler nicht richtig erkannt wird, bietet das erfindungsgemäße Verfahren die Möglichkeit, das elektrisch angesteuerte Stellglied in allen Betriebsbereichen zu testen. Since in a adjuster system without pressure control valve, this possibility is not given, 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.
Des Weiteren wird ein Steuergerät zur Durchführung des erfinderischen Verfahrens beansprucht, sowie ein Motor- Tester, welcher das erfinderische Verfahren auf einem Steuergerät anfordert. Furthermore, a 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.
Die Aufgabe wird durch ein erfindungsgemäßes Verfahren nach dem unabhängigen Patentanspruch 1 und durch ein erfindungsgemäßes Steuergerät nach dem unabhängigen Patenanspruch 11, sowie einem Motor- Tester nach dem unabhängigen Patentanspruch 11 gelöst. 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.
Das erfinderische Verfahren umfasst die folgenden Schritte: The inventive method comprises the following steps:
1. ) Anheben der Drehzahl der Hochdruckpumpe. 1.) raising the speed of the high pressure pump.
2. ) Ansteuern des regelbaren Ventils bis der Druck im Kraftstoffspeicher ein erstes niedriges Druckniveaus erreicht hat. Verändern der Bestromung des regelbaren Ventils um einen ersten vorgegeben Wert, so dass das regelbare Ventil weiter geöffnet wird und gleichzeitiges Maximieren einer Einspritzmenge durch den mindestens einen Injektor bis der Druck im Kraftstoffspeicher einen ersten Schwellwert erreicht hat. 2.) Actuation of the controllable valve until the pressure in the fuel reservoir has reached a first low pressure level. Changing the energization of the controllable valve by a first predetermined value, so that the controllable valve is opened further and simultaneously maximizing an injection amount by the at least one injector until the pressure in the fuel storage has reached a first threshold.
4.) Ansteuern des regelbaren Ventils, bis der Druck im Kraftstoffspeicher wieder das erste niedrige Druckniveau erreicht hat. 5.) Bestimmen einer weiteren Größe, welche abhängig von dem niedrigen Druckniveau und einem Maximalwert des Druckes der im Kraftstoffspeicher erreicht wurde, ist. 4.) Activation of the controllable valve until the pressure in the fuel reservoir has again reached the first low pressure level. 5.) Determining a further quantity, which is dependent on the low pressure level and a maximum value of the pressure reached in the fuel storage is.
Es ist von Vorteil wenn, die weitere Größe die Druckdifferenz zwischen dem ersten niedrigen Druckniveau und einem Maximalwert des Druckes ist oder wenn die weitere Größe die Zeit ist, welche benötigt wird bis der Druck vom ersten niedrigen Druckniveau auf den Maximalwert des Druckes angestiegen ist. Beide Größen lassen sich für das regelbare Ventil in einem Kennfeld beschreiben, so dass sie für ein funktionsfähiges regelbares Ventil einfach und sicher reproduzierbar sind. It is advantageous if 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. Both variables can be described for the controllable valve in a characteristic diagram, so that they can be easily and reliably reproduced for a functional controllable valve.
Eine Abweichung der Druckdifferenz und/oder der Zeit von dem jeweils hinterlegten Kennfeld gibt auf einfache und vorteilhafte Weise Rückschluss auf einen Fehler des regelbaren Ventils. Das regelbare Ventil muss nicht zur Überprüfung eines Fehlers ausgebaut werden, was sowohl Zeit als auch Kosten in der Werkstatt reduziert. 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.
Eine mehrfache Wiederholung der Schritte 1.) bis 5.), während einer Überprüfung des regelbaren Ventils ist von Vorteil, da durch die Wiederholungen die Genauigkeit des Testes erhöht wird und auch ein Fehler, der mit einer geringeren Wahrscheinlichkeit auftritt detektiert wird. Hierbei bietet die Bestromung des regelbaren Ventils jeweils mit dem gleichen Wert, welcher dem ersten vorgegeben Wert entspricht, einen einfachen Testmodus. 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. Here, the energization of the controllable valve in each case with the same value, which corresponds to the first predetermined value, a simple test mode.
Bei mehrfachen Wiederholungen ist ein Vergleich der weiteren Größe zwischen den Wiederholungen vorteilhaft, da die weitere Größe bei gleichbleibenden Randbedingungen keine Veränderung aufweisen sollte. Auf diese Weise ist auch ohne Kennfeld ein Fehler des regelbaren Ventils einfach zu erkennen. For multiple iterations, a comparison of the further size between the repetitions is advantageous, since the further size should have no change under constant boundary conditions. In this way, a fault of the controllable valve is easy to recognize even without a map.
Eine mehrfache Wiederholung der Schritte 1.) bis 5), wobei die Bestromung des regelbaren Ventils um jeweils einen anderen Wert verändert wird, ist vorteilhaft, da eine größere Bandbreite von Betriebszuständen untersucht werden kann und somit ein Fehler, der eventuell nur bei einem bestimmten Betriebszustand auftritt mit höherer Wahrscheinlichkeit gefunden werden kann. Eine einfache Möglichkeit ist hierbei die Bestromung bei jeder Wiederholung um den gleichen Betrag zu verändern. Typischerweise wird der Druck im Kraftstoffspeicher für die Verfahrensschritte 2.) und 4.) über den Druckregler eingestellt wird, welcher dem Steuergerät eine Information über den Druck im Kraftstoffspeicher liefert, so dass das dieser das regelbare Ventil entsprechen ansteuert. 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. Typically, 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.
Im Rahmen dieser Anmeldung wird der Begriff steuern bzw. ansteuern für die in der Reglungstechnik bekannten Begriffe steuern und regeln benutzt. 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.
Um die Genauigkeit zu erhöhen, können vorteilhafterweise Funktionen, welche das Ergebnis des erfinderischen Verfahrens verfälschen können, gesperrt werden. In order to increase the accuracy, advantageously functions which can falsify the result of the inventive method can be blocked.
Ausführungsbeispiele embodiments
Bevorzugte Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Preferred embodiments of the invention are illustrated in the drawing and explained in more detail in the following description.
Es zeigen: Show it:
Figur 1 eine Kraftstofffördereinrichtung in einer schematischen Darstellung und Figure 1 shows a fuel delivery device in a schematic representation and
Figur 2 ein Flussdiagramm des Verfahrens gemäß einer ersten Ausführungsform der vorliegenden Erfindung. FIG. 2 shows a flowchart of the method according to a first embodiment of the present invention.
Ausführungsformen der Erfindung Embodiments of the invention
Figur 1 zeigt eine schematische Darstellung einer Kraftstofffördereinrichtung 10 mit einer Steuergerät 11 gemäß einer Ausführungsform der vorliegenden Erfindung. Es sind nur die für das Verständnis der Erfindung wichtigen Bauteile dargestellt. 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.
Eine Vorförderpumpe 12 saugt Kraftstoff über eine Zulaufleitung 13 aus einem Tank 14 an. Die Vorförderpumpe 12 versorgt ein regelbares Ventil 15, mit Kraftstoff. Das regelbare Ventil 15 steuert die einer Hochdruckpumpe 16 zugeführte Kraftstoffmenge. Die Hochdruckpumpe 16 fördert den ihr zugeführten Kraftstoff unter hohem Druck in den Kraftstoffspeicher 17. Im Kraftstoffspeicher 17 wird der Druck durch einen Druckregler 20 kontrolliert. Der Kraftstoff im Kraftstoffspeicher 17 wird weiterhin über eine HochdruckleitungA 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
22 mindestens einem Injektor 23 zugeführt, welcher Kraftstoff in mindestens einen nicht gezeigten Zylinder einer Brennkraftmaschine einspritzt. Eine für den Betrieb der Injektoren 23 erforderliche Kraftstoffmenge wird ebenfalls über eine Kraftstoffrückführungsleitung 21 zum Tank 14 zurückgeführt. 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.
Ein Steuergerät 11 steuert über eine elektrische Steuerleitung 25 das regelbare Ventil 15 an. Des Weiteren erhält das Steuergerät 11 über eine elektrische Steuerleitung 26 den durch den Druckregler 20 gemessenen Druck im Kraftstoffspeicher 17. Das Steuergerät 11 steuert über eine elektrische Steuerleitung 27 die In- jektoren 23 an. Das Steuergerät 11 enthält außerdem einer Software zur Steuerung des Motors im Betrieb und eine Software zur Ausführung des erfindungsgemäßen Verfahrens zur Prüfung des regelbaren Ventils 15. Die Steuerung des Motors erfolgt durch elektrische Ansteuerung des elektrisch angesteuerten Stellgliedes, nämlich des regelbaren Ventils 15, eingangsseitig der Hochdruckpumpe 16. 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
Figur 2 zeigt ein Flussablaufdiagramm, welches das erfindungsgemäße Verfahren beschreibt. Aufgabe des erfindungsgemäßen Verfahrens ist die Prüfung des elektrisch angesteuerten Stellglieds in einer Werkstatt ohne, dass das elektrisch angesteuerte Stellglied ausgebaut werden muss. 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.
Bevor das eigentliche Verfahren zur Prüfung beginnt, können im Verfahrensschritt 31 optional alle Funktionalitäten gesperrt werden, welche das Ergebnis der Prüfung des regelbaren Ventils 15 verfälschen können. Dies kann z.B. ein Partikel regenerator sein, welcher während der Prüfung ausgeschaltet wird. Before the actual method for testing begins, in 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.
Im Verfahrensschritt 32 wird die Drehzahl der Hochdruckpumpe 16 stark angehoben, um eine hohe Fördermenge der Hochdruckpumpe 16 und eine hohe Einspritzmenge des mindestens einen Injektors 23 zu realisieren. Das Anheben der Drehzahl findet im Werkstattbetrieb meist im Leerlauf statt. Das Verfahren kann aber auch bei einer Last, welche während des gesamten Verfahrens identisch sein muss, stattfinden. In method 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.
Im Verfahrensschritt 33 wird das regelbare Ventils 15 so angesteuert, dass der Druck im Kraftstoffspeicher 17 sinkt bis der Druck im Kraftstoffspeicher 17 ein erstes niedriges Druckniveaus erreicht hat. Die Ansteuerung des regelbaren Ventils 15 erfolgt über das Steuergerät 11, welches durch den Druckregler 20 eine Information über den Druck im Kraftstoffspeicher 17 erhält. Aus diesem Grund wird der Druck im Verfahrensschritt 33 über den Druckregler 20 eingestellt. In method step 33, 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.
In einer weiteren Ausführungsform ist es möglich, dass der Druckregler 20 direkt mit dem regelbaren Ventil 15 verbunden ist und dieses so ansteuert bis sich ein gewünschter Druck, welcher dem ersten niedrigen Druckniveau entspricht, im Kraftstoffspeicher 17 einstellt. In a further embodiment, 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.
Im Verfahrensschritt 34 wird die Bestromung des regelbaren Ventils 15 durch das Steuergerät 11 um einen ersten vorgegeben Wert verändert, so dass das regelbare Ventil 15 weiter geöffnet wird. Abhängig von der Art des regelbaren Ventils 15 kann hierbei die Bestromung erhöht werden oder gesenkt werden, um ein weiteres Öffnen des regelbaren Ventils 15 zu erreichen. Beispielhaft kann hier ein möglicher Wert von 50mA genutzt werden, um den der Strom des regelbaren Ventils 15 angehoben oder gesenkt werden kann. In 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. Depending on the type of controllable valve 15 in this case the energization can be increased or decreased in order to achieve a further opening of the controllable valve 15. By way of example, a possible value of 50 mA can be used here, by which the current of the controllable valve 15 can be raised or lowered.
Gleichzeitig findet im Verfahrensschritt 34 ein Maximieren einer Einspritzmenge durch den mindestens einen Injektor 23 statt. Die veränderte Bestromung des regelbaren Ventils 15 und das Maximieren der Einspritzmenge des mindestens einen Injektors 23 wird so lange beibehalten bis der Druck im Kraftstoffspeicher 17 einen ersten Schwellwert erreicht hat. Im Verfahrensschritt 35 wird das regelbare Ventils 15 so angesteuert, dass derAt the same time, 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. In step 35, the controllable valve 15 is controlled so that the
Druck im Kraftstoffspeicher 17 sinkt bis der Druck im Kraftstoffspeicher 17 das erste niedrige Druckniveau erreicht hat. Das Ansteuern des regelbaren Ventils 15 erfolgt im Verfahrensschritt 35 analog zum Verfahrensschritt 33. Im Verfahrensschritt 36 wird eine weitere Größe bestimmt, welche abhängig von dem ersten niedrigen Druckniveau und einem Maximalwert des Druckes ist. Der Maximalwert liegt meist oberhalb des ersten Schwellwertes und ist durch Träg- heitseffekte des Kraftstoffeinspritzsystems 10 bedingt. Ein Schließen des regelbaren Ventils 15 zeigt erst mit einer gewissen Zeitverzögerung eine Auswirkung auf den Druck im Kraftstoffspeicher 17, so dass der Druck im Kraftstoffspeicher 17 auch nach dem Erreichen des Schwellwertes noch ansteigt bis der Maximalwert erreicht ist. 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. In method step 36, 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.
Die weitere Größe kann eine Druckdifferenz zwischen dem ersten niedrigen Druckniveau und dem Maximalwert des Druckes sein. In einer alternativen Ausführungsform kann die weitere Größe auch die Zeit sein, welche benötigt wird bis der Druck vom ersten niedrigen Druckniveau auf den Maximalwert des Druckes angestiegen ist. The further variable may be a pressure difference between the first low pressure level and the maximum value of the pressure. In an alternative embodiment, 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.
Im Verfahrensschritt 37 findet ein Vergleich der weiteren Größe, die im Verfahrensschritt 36 bestimmt wurde, mit einem hinterlegten Kennfeld der weiteren Größe des regelbaren Ventils 15 statt. In 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.
In einer weiteren alternativen Ausführungsform ist es auch möglich sowohl die Druckdifferenz zwischen dem ersten niedrigen Druckniveau und dem Maximalwert des Drucks zu bilden, als auch die Zeit zu bestimmen, welche benötigt wird bis der Druck vom ersten niedrigen Niveau auf den Maximalwert angestiegen ist. Sowohl die Druckdifferenz als auch die Zeit können dann mit dem jeweiligen Kennfeld verglichen werden. In a further alternative embodiment, it is also possible to form both the pressure difference between the first low pressure level and the maximum value of the pressure, as well as to determine the time required for the pressure to increase from the first low level to the maximum value. Both the pressure difference and the time can then be compared with the respective map.
Eine Abweichung der Druckdifferenz und/oder der Zeit von dem jeweiligen hinterlegten Kennfeld kann einen Rückschluss auf einen Fehler des regelbaren Ventils 15 geben. 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.
Weist das regelbare Ventil 15 einen Fehler auf, wie zum Beispiel ein klemmendes Bauteil, so stimmt die gemessene Druckdifferenz und/oder die gemessene Zeit nicht mit der hinterlegten Kennlinie überein. If the 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.
Die Verfahrensschritte 32 bis 37 können mehrfach wiederholt werden, wobei die Bestromung des regelbaren Ventils 15 jeweils um den gleichen Wert, welcher dem im ersten Durchlauf vorgegeben Wert entspricht, verändert wird. 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.
Hierbei kann ein Vergleich der weiteren Größe zwischen den jeweiligen Wiederholungen stattfinden. Weicht der Wert der weiteren Größe zwischen den Wieder- holungen voneinander ab, obwohl die Randbedingungen gleich waren (z.B. gleiche Veränderung der Bestromung), so liegt ein Fehler des regelbaren Ventils 15 vor. Here, a comparison of the further size between the respective repetitions take place. If the value of the further variable differs between the From each other, although the boundary conditions were the same (eg, the same change in the energization), so there is a fault of the controllable valve 15 before.
Alternativ ist es möglich die Verfahrensschritte 32 bis 37 mehrfach zu wiederholen, wobei die Bestromung des regelbaren Ventils 15 um jeweils einen anderen Wert verändert wird. Hierbei ist es möglich die Bestromung bei jeder Wiederholung um den gleichen Betrag zu verändern. Alternatively, it is possible to repeat the method steps 32 to 37 several times, wherein the energization of the controllable valve 15 is changed by a different value. It is possible to change the current at each repetition by the same amount.
Beispielsweise könnte bei einem ersten Durchlauf der Verfahrensschritte 32 bis 37 die Bestromung um 50 mA gesenkt oder angehoben werden, bei einem zweiten Durchlauf der Verfahrensschritte 32 bis 37 könnte die Bestromung um For example, in a first pass of the method steps 32 to 37, the current supply could be lowered or raised by 50 mA, in a second pass of the method steps 32 to 37 the current could be reversed
100mA gesenkt oder angehoben werden, bei einem dritten Durchlauf der Verfahrensschritte 32 bis 37 könnte die Bestromung um 150mA gesenkt oder angehoben werden, usw.. 100mA lowered or raised, in a third pass of steps 32 to 37, the energization could be lowered or raised by 150mA, etc ..
Es ist sowohl möglich die Differenz des Druckes und oder die Zeit nach jedem der Durchläufe zu bestimmen. Alternativ ist es aber auch möglich nur die Verfahrensschritte 32 bis 36 zu wiederholen und eine Auswertung der Druckdifferenzen und /oder Zeit jedes Durchlaufes am Schluss in einem gemeinsamen Verfahrensschritt 37 anzuschließen. It is possible to determine the difference of the pressure and / or the time after each of the runs. Alternatively, it is also possible to repeat only the method steps 32 to 36 and to connect an evaluation of the pressure differences and / or time of each run at the end in a common method step 37.
Das erfindungsgemäße Verfahren wird durch ein Steuergerät 11 durchgeführt, welches über elektrische Steuerleitungen 25,26 mit dem regelbaren Ventil 15 und dem Druckregler 20 in Verbindung steht. Des Weiteren ist auf dem Steuergerät 11 eine Software hinterlegt und Daten über das Kennfeld des jeweiligen regelbaren Ventiles. 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.
Das erfindungsgemäße Verfahren wird durch einen Werkstatt- Tester angefordert, welcher über eine beliebige Schnittstelle eine Verbindung mit dem Steuergerät 11 aufnehmen kann. Die Ergebnisse des erfindungsgemäßen Verfahrens werden durch das Steuergerät 11 an den Werkstatttester übermittelt. 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.

Claims

Patentansprüche  claims
1. Verfahren zur Prüfung eines elektrisch angesteuerten Stellglieds in einer Kraftstofffördereinrichtung (10) einer Brennkraftmaschine, wobei das elektrische Stellglied ein regelbares Ventil (15) ist, welches eingangsseitig einer Hochdruckpumpe (16) angeordnet ist, wobei die Hochdruckpumpe (16)1. A method for testing an electrically controlled actuator in a fuel delivery device (10) of an internal combustion engine, wherein the electric actuator is a controllable valve (15) which is arranged on the input side of a high pressure pump (16), wherein the high pressure pump (16)
Kraftstoff in einen Kraftstoffspeicher (17) mit einem Druckregler (20) fördert und der Kraftstoffspeicher (17) mit mindestens einem Injektor (23) verbunden ist, umfassend die folgenden Schritte: Conveying fuel into a fuel reservoir (17) with a pressure regulator (20) and the fuel reservoir (17) being connected to at least one injector (23), comprising the following steps:
1.) Anheben der Drehzahl der Hochdruckpumpe (16).  1.) Raising the speed of the high-pressure pump (16).
2.) Ansteuern des regelbaren Ventils (15) bis der Druck im Kraftstoffspeicher 2.) Actuation of the controllable valve (15) until the pressure in the fuel tank
(17) ein erstes niedriges Druckniveaus erreicht hat. (17) has reached a first low pressure level.
3. ) Verändern der Bestromung des regelbaren Ventils (15) um einen ersten vorgegeben Wert, so dass das regelbare Ventil (15) weiter geöffnet wird und gleichzeitiges Maximieren einer Einspritzmenge durch den mindes- tens einen Injektor (23) bis der Druck im Kraftstoffspeicher (17) einen ersten Schwellwert erreicht hat.  3.) changing the energization of the controllable valve (15) by a first predetermined value, so that the controllable valve (15) is opened further and simultaneously maximizing an injection quantity through the at least one injector (23) until the pressure in the fuel reservoir ( 17) has reached a first threshold.
4. ) Ansteuern des regelbaren Ventils (15), bis der Druck im Kraftstoffspeicher (17) wieder das erste niedrige Druckniveau erreicht hat.  4.) activating the controllable valve (15) until the pressure in the fuel reservoir (17) has again reached the first low pressure level.
5. ) Bestimmen einer weiteren Größe, welche abhängig von dem niedrigen Druckniveau und einem Maximalwert des Druckes der im Kraftstoffspeicher (17) erreicht wurde, ist.  5.) Determining a further variable, which is dependent on the low pressure level and a maximum value of the pressure in the fuel reservoir (17) has been reached.
2. Verfahren nach Anspruch 1, wobei die weitere Größe die Druckdifferenz zwischen dem ersten niedrigen Druckniveau und einem Maximalwert des Druckes ist. 2. The method of claim 1, wherein the further variable is the pressure difference between the first low pressure level and a maximum value of the pressure.
3. Verfahren nach Anspruch 1, wobei die weitere Größe die Zeit ist, welche benötigt wird bis der Druck vom ersten niedrigen Druckniveau auf den Maximalwert des Druckes angestiegen ist. 3. The method of claim 1, wherein 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.
4. Verfahren nach einem der Ansprüche 1 bis 3, wobei in einem weiteren 4. The method according to any one of claims 1 to 3, wherein in a further
Schritt 6.) die weitere Größe mit einem hinterlegten Kennfeld für das regel- bare Ventils (15) verglichen wird und eine Abweichung von dem hinterlegten Kennfeld einen Rückschluss auf einen Fehler gibt. Step 6.) the further size with a stored characteristic field for the regular bare valve (15) is compared and a deviation from the stored map gives an indication of an error.
Verfahren nach Anspruch 4, wobei die Schritte 1.) bis 6.) mehrfach wiederholt werden und die Bestromung des regelbaren Ventils (15) jeweils um den gleichen Wert, welcher dem ersten vorgegeben Wert entspricht, verändert wird. Method according to claim 4, wherein the steps 1.) to 6.) are repeated several times and the energization of the controllable valve (15) is changed in each case by the same value, which corresponds to the first predetermined value.
6. Verfahren nach einem der Ansprüche 1 bis 3 , wobei die Schritte 1.) bis 5.) mehrfach wiederholt werden und die Bestromung des regelbaren Ventils (15) jeweils um den gleichen Wert, welcher dem ersten vorgegeben Wert entspricht, verändert wird, wobei eine Abweichung der weiteren Größe zwischen den Wiederholungen einen Rückschluss auf einen Fehler des regelbaren Ventils (15) gibt. 6. The method according to any one of claims 1 to 3, wherein steps 1.) to 5.) are repeated several times and the energization of the controllable valve (15) in each case by the same value, which corresponds to the first predetermined value, is changed a deviation of the further size between the repetitions can be traced back to an error of the controllable valve (15).
7. Verfahren nach Anspruch 4, wobei die Schritte 1.) bis 6.) mehrfach wiederholt werden und die Bestromung des regelbaren Ventils (15) um jeweils einen anderen Betrag verändert wird. 8. Verfahren nach Anspruch 7, wobei die Bestromung bei jeder Wiederholung um den gleichen Betrag erhöht oder erniedrigt wird. 7. The method of claim 4, wherein the steps 1.) to 6.) are repeated several times and the energization of the controllable valve (15) is changed by a different amount. 8. The method of claim 7, wherein the current is increased or decreased at each repetition by the same amount.
9. Verfahren nach einem der vorherigen Ansprüche, wobei der Druck in Schritt 2.) und 4.) über den Druckregler (20) eingestellt wird. 9. The method according to any one of the preceding claims, wherein the pressure in step 2.) and 4.) via the pressure regulator (20) is set.
10. Verfahren nach einem der vorherigen Ansprüche, wobei vor Schritt 1.) Funktionalitäten gesperrt werden, welche das Ergebnis des Verfahrens verfälschen können. 11. Steuergerät (11) zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 10. 10. The method according to any one of the preceding claims, wherein prior to step 1.) functionalities are blocked, which can falsify the result of the method. 11. Control device (11) for carrying out the method according to one of claims 1 to 10.
12. Werkstatt- Tester, welcher das Verfahren nach einem der Ansprüche 1 bis 10 auf einem Steuergerät (11) anfordert. 12. workshop tester, which requests the method according to one of claims 1 to 10 on a control unit (11).
EP15788063.4A 2014-12-19 2015-11-03 Method and apparatus for diagnosing a fuel supply system Active EP3234328B1 (en)

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