EP2132473A1 - Method for the diagnosis of a shut-off valve - Google Patents

Method for the diagnosis of a shut-off valve

Info

Publication number
EP2132473A1
EP2132473A1 EP08708931A EP08708931A EP2132473A1 EP 2132473 A1 EP2132473 A1 EP 2132473A1 EP 08708931 A EP08708931 A EP 08708931A EP 08708931 A EP08708931 A EP 08708931A EP 2132473 A1 EP2132473 A1 EP 2132473A1
Authority
EP
European Patent Office
Prior art keywords
valve
shut
fuel
pressure
expected
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.)
Withdrawn
Application number
EP08708931A
Other languages
German (de)
French (fr)
Inventor
Juergen Foerster
Winfried Langer
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 EP2132473A1 publication Critical patent/EP2132473A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
    • F02D19/025—Failure diagnosis or prevention; Safety measures; Testing
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0206—Non-hydrocarbon fuels, e.g. hydrogen, ammonia or carbon monoxide
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for diagnosing a shut-off valve in a fuel line according to the preamble of the independent claim and a fuel supply system.
  • Compressed gas (CNG) systems typically include a series connection of a tank shut-off valve, a pressure regulator shut-off valve, a pressure regulator module, and a low-pressure relief valve.
  • the pressure regulator module itself also has a valve function which shuts off the low-pressure region from the high-pressure region if the pressures are too high in order to prevent the injection valves or injection valves from reliably opening when the pressures are too high.
  • a CNG system is known by way of example in which fuel is stored under pressure in a tank and conducted via a fuel line to injection valves. After switching off the internal combustion engine and closing the tank valves, it is provided to check the fuel pressure in the fuel line, with an external leakage - ie a leak of the
  • Fuel system out to the environment - is detected when the fuel pressure drops faster than expected.
  • the inventive method with the features of the independent method claim has the advantage that a shut-off valve, which is arranged in a fuel line between at least one tank and at least one injection valve, in a few steps with typically already existing sensors or measuring means on its shut-off - ie internal leakage - can be checked.
  • the shut-off valve is closed and monitored the fuel pressure downstream of the closed shut-off valve, wherein further fuel is admitted via a blow-in valve for operating an internal combustion engine in a combustion chamber.
  • a downstream of the shut-off valve expected fuel pressure is determined, the shut-off of the valve is not recognized as sufficient if the fuel pressure downstream of the shut-off valve from the expected fuel pressure deviates or does not decrease as expected.
  • a fuel supply system having the features of the independent apparatus claim is equally advantageous.
  • a control device with an adjusting means and a monitoring means is provided, wherein the control device and the device means are arranged for carrying out the method according to the invention.
  • the shut-off is also recognized as insufficient if the fuel pressure downstream of the shut-off valve exceeds the expected fuel pressure and / or the fuel pressure deviates from an expected pressure profile.
  • a fuel mass in the system can be determined from the pressure and the temperature, and the shut-off effect of the valve can be recognized as insufficient if the fuel mass in the fuel line downstream of the shut-off valve does not fall below an expected fuel mass.
  • FIG. 1 An example of a fuel supply system according to the invention is shown in FIG.
  • FIG. 1 shows schematically a fuel supply system for the operation of an internal combustion engine with LPG or compressed gas, for example o- the hydrogen or natural gas.
  • the fuel is stored under pressure in a first and second tank 100, 110.
  • a first and second tank pressure sensor 200, 210 Of the Pressure of the fuel in the first and second tanks 100, 110, and thus indirectly also the fuel level, is monitored in each case via a first and second tank pressure sensor 200, 210.
  • the two tanks 100, 110 are connected to a common fuel line 50, which leads the fuel to a pressure control valve 300 and downstream of the pressure control valve 300 to four injection valves 700.
  • a Tankabsperrventil 500, 510 is arranged in each case.
  • a shut-off valve 400 is provided and between the pressure regulator 300 and the shut-off valve 400, a third pressure sensor 220 and between the pressure regulator 300 and the injection valves 700, a fourth pressure sensor 230.
  • a filler neck 600 is arranged at one end of the common fuel line 50 ,
  • hydrogen is stored in the two tanks 100, 110 under a pressure of up to 300 bar.
  • the Tankabsperrventile 500, 510 and the check valve 400 in the fuel line 50 are open.
  • the tank pressure of, for example, ⁇ 300 bar is measured via the third pressure sensor 220.
  • the pressure regulator 300 reduces the applied pressure, so that downstream of the pressure regulator 300, for example, a pressure of 2 to 6 bar is applied in the fuel line. With this low pressure, the fuel is then blown into the combustion chamber of an internal combustion engine, not shown, via the injection valves 700.
  • shut-off valves 500, 510, 400 In the event of a malfunction or under special operating conditions, it is planned to close the shut-off valves 500, 510, 400. For example, if there is a leakage of the injection valves 700 or the fuel line, so escape of the fuel is avoided in the environment. Due to the high safety relevance of the shut-off valves, it is desirable to check the shut-off effect of the shut-off valves routinely.
  • shut-off valve 400 To check the shut-off or the tightness of a shut-off valve, it is provided according to the invention to close the shut-off valve 400 and to monitor the fuel pressure downstream of the shut-off valve 400, wherein the injection valve 700 is further actuated to operate the internal combustion engine.
  • a fuel mass can be determined, which flows into the combustion chamber.
  • the injected fuel mass reduces the fuel mass in the fuel line and leads, in a closed and tight-fitting shut-off valve 400, to a pressure reduction in the fuel line. If the pressure reduction does not occur in the expected manner, it can be assumed that fuel will flow into the fuel line via the shut-off valve.
  • Each injection process also reduces the expected fuel pressure in the fuel line downstream of the closed shut-off valve. As the number of injections increases, the differential pressure between the upstream and downstream sides of the shut-off valve thus increases.
  • a threshold above the expected fuel pressure at which the blocking effect of the shut-off valve 400 is still tolerated as sufficient.
  • the threshold value has to be tracked in accordance with the fuel mass flowing out via the injection valve.
  • the pressure downstream of the closed shut-off valve 400 to be tested is lowered by blowing out the fuel via the injection valves 700 to a pressure below the pressure control threshold. If the pressure control threshold of the pressure regulator 300 is, for example, 6 bar, the pressure would be below 6 bar, for example 2 bar. Under these conditions, the pressure regulator 300 is fully open and the
  • Pressure sensor 230 thus measures the pressure directly on the downstream side of the shut-off valve 400.
  • This procedure has the advantage that, on the one hand, the differential pressure at the shut-off valve 400 becomes as large as possible and, on the other hand, the fourth pressure sensor 230 reacts more sensitively in the low-pressure region than through the smaller measuring range the third pressure sensor 220 in the high pressure Area. The accuracy and reliability of the measurement thus increases.
  • an additional calculation of the mass increase in the observed volume can be carried out by an additional temperature detection.
  • the temperature can be measured with a temperature sensor at the observed volume or a tank temperature sensor.
  • a fuel supply system can be dispensed with a first and second pressure sensor 200, 210 and the fuel pressure in other ways or for example via the third pressure sensor 220 can be determined.
  • the method according to the invention is furthermore not limited to the diagnosis of a shut-off valve 400.
  • the two tank valves 500, 510 can be examined for their shut-off.
  • a pressure threshold is expediently provided below which the diagnosis is not carried out, or a load threshold above which the diagnosis is not carried out.
  • the shut-off valve is closed until the fuel pressure downstream of the shut-off valve has noticeably dropped. This allows the further operation of the internal combustion engine as well as the implementation of the diagnosis.
  • the injected fuel mass is accumulated and compared to a maximum value defined for that shut-off valve at which a pressure drop is detectable.
  • the defined permissible maximum value of the accumulated injected fuel mass can be determined, for example, in advance and, if necessary, stored in maps for retrieval. If the stored permissible maximum value is exceeded, the shut-off valve is detected as faulty.
  • a suitable maximum permissible opening time of the shut-off valve can also be stored. Furthermore, it is also possible to provide a second pressure threshold, from which the shut-off valve is closed again. It is also conceivable to operate the shut-off valve periodically.
  • the shut-off effect is only recognized as insufficient if this has been established in several diagnoses.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a method for the diagnosis of a shut-off valve (400, 500, 510) in a fuel line (50), wherein the shut-off valve is disposed in the fuel line between at least one reservoir and at least one injection valve (70), wherein the shut-off valve is closed for the diagnosis, and fuel is removed via an injection valve for the operation of an internal combustion engine. The shut-off effect of the shut-off valves is determined to be insufficient if the pressure in the fuel line does not drop in an unexpected manner.

Description

Beschreibung description
Titeltitle
Verfahren zur Diagnose eines AbsperrventilsMethod for diagnosing a shut-off valve
Stand der TechnikState of the art
Die Erfindung geht aus von einem Verfahren zur Diagnose eines Absperrventils in einer Kraftstoff leitung nach der Gattung des unabhängigen Anspruchs sowie ein Kraftstoffversorgungssystem.The invention relates to a method for diagnosing a shut-off valve in a fuel line according to the preamble of the independent claim and a fuel supply system.
Systeme mit komprimiertem Gas, so genannte CNG (compressed natural gas) - Systeme beinhalteten typischerweise eine Reihenschaltung von einem Tank- Absperrventil, einem Druckreglerabsperrventil, einem Druckregelmodul und einem Überdruckventil im Niederdruck-System. Hierbei hat häufig das Druckre- gelmodul selbst ebenfalls eine Ventilfunktion, die bei zu hohen Drücken den Niederdruckbereich vom Hochdruckbereich absperrt, um zu vermeiden, dass bei zu hohen Drücken die Einspritzventile bzw. Einblasventile nicht mehr zuverlässig öffnen.Compressed gas (CNG) systems typically include a series connection of a tank shut-off valve, a pressure regulator shut-off valve, a pressure regulator module, and a low-pressure relief valve. Often, the pressure regulator module itself also has a valve function which shuts off the low-pressure region from the high-pressure region if the pressures are too high in order to prevent the injection valves or injection valves from reliably opening when the pressures are too high.
Aufgrund rechtlicher Erfordernisse sind insbesondere Tankabsperrventile vorgeschrieben. Ein Fehler der Absperrfunktion, also interne Leckagen, haben jedoch keinen Einfluss auf den normalen Fahrzeugbetrieb. Sollten die Absperrvorrichtungen in einem Störfall nicht ausreichend schließen, besteht die Gefahr, dass der komplette Tankinhalt in die Umgebung entweichen kann. Deshalb besteht ein besonderes Interesse die Absperrwirkung der Absperrvorrichtungen/-ventile imDue to legal requirements in particular Tankabsperrventile are prescribed. An error in the shut-off function, ie internal leaks, does not affect normal vehicle operation. If the shut-off devices do not close sufficiently in the event of a malfunction, there is a risk that the entire tank contents may escape into the environment. Therefore, there is a particular interest the shut-off effect of the shut-off devices / valves in
Vorfeld vorzugsweise routinemäßig zu überprüfen und bei mangelnder Absperrwirkung eine Warnung oder eine Fehlerreaktion einzuleiten.It is preferable to check the apron routinely and to initiate a warning or a fault reaction if there is a lack of blocking effect.
Aus der nicht vorveröffentlichten DE 10 2005 048 456 ist bereits ein Verfahren bekannt, bei dem stromabwärts eines Absperrventils ein geringer Kraftstoffdruck eingestellt wird, wobei bei einem geschlossenen Absperr- und Einblasventil ü- berprüft wird, ob der Kraftstoffdruck stromabwärts des Absperrventils ansteigt. Bei einem ansteigenden Kraftstoff druck wird eine nicht ausreichende Absperrwirkung des Absperrventils erkannt.From the unpublished DE 10 2005 048 456 a method is already known in which downstream of a shut-off valve, a low fuel pressure is set, with a closed shut-off and insufflation ü checks whether the fuel pressure rises downstream of the check valve. In an increasing fuel pressure insufficient blocking of the shut-off valve is detected.
Aus der US 6,427,670 B2 ist beispielhaft ein CNG-System bekannt, bei dem Kraftstoff unter Druck in einem Tank bevorratet und über eine Kraftstoff leitung zu Einspritzventilen geführt wird. Nach dem Abstellen der Brennkraftmaschine und Schließen der Tankventile ist es vorgesehen, den Kraftstoffdruck in der Kraftstoff- leitung zu überprüfen, wobei eine externe Leckage - also eine Undichtigkeit desFrom US Pat. No. 6,427,670 B2, a CNG system is known by way of example in which fuel is stored under pressure in a tank and conducted via a fuel line to injection valves. After switching off the internal combustion engine and closing the tank valves, it is provided to check the fuel pressure in the fuel line, with an external leakage - ie a leak of the
Kraftstoffsystems nach außen zur Umgebung - erkannt wird, wenn der Kraftstoffdruck schneller als erwartet sinkt.Fuel system out to the environment - is detected when the fuel pressure drops faster than expected.
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Verfahren mit den Merkmalen des unabhängigen Verfahrensanspruchs hat demgegenüber den Vorteil, dass ein Absperrventil, das in einer Kraftstoffleitung zwischen mindestens einem Tank und mindestens einem Einblasventil angeordnet ist, in wenigen Schritten mit typischerweise ohnehin vorhandenen Sensoren oder Messmitteln auf seine Absperrwirkung - also interne Leckage - überprüft werden kann. Hierzu wird das Absperrventil geschlossen und der Kraftstoff druck stromabwärts des geschlossenen Absperrventils überwacht, wobei weiterhin Kraftstoff über ein Einblasventil zum Betreiben einer Brennkraftmaschine in einen Brennraum eingelassen wird. Ausgehend von der eingelassenen Kraftstoffmasse wird ein stromabwärts des Absperrventils zu erwartender Kraftstoffdruck ermittelt, wobei die Absperrwirkung des Ventils als nicht ausreichend erkannt wird, wenn der Kraftstoff druck stromabwärts des Absperrventils von dem erwarteten Kraftstoff druck abweicht bzw. nicht wie erwartet abnimmt.The inventive method with the features of the independent method claim has the advantage that a shut-off valve, which is arranged in a fuel line between at least one tank and at least one injection valve, in a few steps with typically already existing sensors or measuring means on its shut-off - ie internal leakage - can be checked. For this purpose, the shut-off valve is closed and monitored the fuel pressure downstream of the closed shut-off valve, wherein further fuel is admitted via a blow-in valve for operating an internal combustion engine in a combustion chamber. Starting from the introduced fuel mass, a downstream of the shut-off valve expected fuel pressure is determined, the shut-off of the valve is not recognized as sufficient if the fuel pressure downstream of the shut-off valve from the expected fuel pressure deviates or does not decrease as expected.
Ferner ist auch ein Kraftstoffversorgungssystem mit den Merkmalen des unabhängigen Vorrichtungsanspruchs in gleicher Weise vorteilhaft. Hierbei ist ein Steuergerät mit einem Stellmittel und einem Überwachungsmittel vorgesehen, wobei das Steuergerät und die Vorrichtungsmittel zur Ausführung des erfin- dungsgemäßen Verfahrens eingerichtet sind. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im unabhängigen Anspruch angegeben Verfahrens möglich.Further, a fuel supply system having the features of the independent apparatus claim is equally advantageous. In this case, a control device with an adjusting means and a monitoring means is provided, wherein the control device and the device means are arranged for carrying out the method according to the invention. The measures listed in the dependent claims advantageous refinements and improvements of the method specified in the independent claim are possible.
Die Absperrwirkung wird ferner als nicht ausreichend erkannt, wenn der Kraftstoffdruck stromabwärts des Absperrventils den erwarteten Kraftstoffdruck übersteigt und/oder der Kraftstoff druck von einem zu erwartenden Druckverlauf abweicht.The shut-off is also recognized as insufficient if the fuel pressure downstream of the shut-off valve exceeds the expected fuel pressure and / or the fuel pressure deviates from an expected pressure profile.
Bei einer weiteren vorteilhaften Ausgestaltung ist es vorgesehen, die Diagnose des Absperrventils beim Abstellen der Brennkraftmaschine durchzuführen, wobei die Brennkraftmaschine bis zum Abschluss der Diagnose betrieben wird.In a further advantageous embodiment, it is provided to carry out the diagnosis of the shut-off valve when switching off the internal combustion engine, wherein the internal combustion engine is operated until the completion of the diagnosis.
Weiterhin ist es von Vorteil, bei der Messung des Drucks in der Kraftstoffleitung eine Größe, die eine Temperatur des Kraftstoffs kennzeichnet zu berücksichtigen.Furthermore, it is advantageous to take into account in the measurement of the pressure in the fuel line, a variable which indicates a temperature of the fuel.
So kann in vorteilhafter Weise, aus dem Druck und der Temperatur eine Kraft- stoffmasse im System ermittelt werden, und die Absperrwirkung des Ventils als nicht ausreichend erkannt werden, wenn die Kraftstoffmasse in der Kraftstoffleitung stromabwärts des Absperrventils ein erwartete Kraftstoffmasse nicht unterschreitet.Thus, in an advantageous manner, a fuel mass in the system can be determined from the pressure and the temperature, and the shut-off effect of the valve can be recognized as insufficient if the fuel mass in the fuel line downstream of the shut-off valve does not fall below an expected fuel mass.
Zeichnungdrawing
Ein Beispiel eines erfindungsgemäßen Kraftstoffversorgungssystems ist in der Figurl dargestellt.An example of a fuel supply system according to the invention is shown in FIG.
Beschreibungdescription
Figur 1 zeigt schematisch ein Kraftstoffversorgungssystem für den Betrieb einer Brennkraftmaschine mit Flüssiggas oder komprimiertem Gas, beispielsweise o- der Wasserstoff oder Erdgas. Der Kraftstoff wird im gezeigten Ausführungsbei- spiel in einem ersten und zweiten Tank 100, 110 unter Druck bevorratet. Der Druck des im ersten und zweiten Tank 100, 110 befindlichen Kraftstoffs, und somit indirekt auch der Kraftstofffüllstand, wird jeweils über einen ersten und zweiten Tankdrucksensor 200, 210 überwacht. Die beiden Tanks 100, 110 sind mit einer gemeinsamen Kraftstoff leitung 50 verbunden, die den Kraftstoff zu einem Druckregelventil 300 und stromabwärts des Druckregelventils 300 auf vier Einblasventile 700 führt. Zwischen der gemeinsamen Kraftstoffleitung 50 und den Tanks 100, 110 ist jeweils ein Tankabsperrventil 500, 510 angeordnet. Stromaufwärts des Druckreglers 300 ist ein Absperrventil 400 vorgesehen und zwischen Druckregler 300 und dem Absperrventil 400 ein dritter Drucksensor 220 und zwischen Druckregler 300 und den Einblasventilen 700 ein vierter Drucksensor 230. Zum Befüllen des Kraftstoffsystems ist an einem Ende der gemeinsamen Kraftstoffleitung 50 ein Füllstutzen 600 angeordnet.Figure 1 shows schematically a fuel supply system for the operation of an internal combustion engine with LPG or compressed gas, for example o- the hydrogen or natural gas. In the exemplary embodiment shown, the fuel is stored under pressure in a first and second tank 100, 110. Of the Pressure of the fuel in the first and second tanks 100, 110, and thus indirectly also the fuel level, is monitored in each case via a first and second tank pressure sensor 200, 210. The two tanks 100, 110 are connected to a common fuel line 50, which leads the fuel to a pressure control valve 300 and downstream of the pressure control valve 300 to four injection valves 700. Between the common fuel line 50 and the tanks 100, 110, a Tankabsperrventil 500, 510 is arranged in each case. Upstream of the pressure regulator 300, a shut-off valve 400 is provided and between the pressure regulator 300 and the shut-off valve 400, a third pressure sensor 220 and between the pressure regulator 300 and the injection valves 700, a fourth pressure sensor 230. To fill the fuel system, a filler neck 600 is arranged at one end of the common fuel line 50 ,
Im Normalbetrieb des Kraftstoffversorgungssystems wird beispielsweise Wasser- stoff in den beiden Tanks 100, 110 unter einem Druck von bis zu 300 bar bevorratet. Die Tankabsperrventile 500, 510 und das Absperrventil 400 in der Kraftstoffleitung 50 sind geöffnet. Insofern steht in der gemeinsamen Kraftstoffleitung 50 bis zum Druckregler der Tankdruck von bspw. <300 bar an und wird über den dritten Drucksensor 220 gemessen. Der Druckregler 300 reduziert den anliegen- den Druck, so dass stromabwärts des Druckreglers 300 beispielsweise ein Druck von 2 bis 6 bar in der Kraftstoffleitung anliegt. Mit diesem Niederdruck wird der Kraftstoff dann in einen Brennraum einer nicht gezeigten Brennkraftmaschine über die Einblasventile 700 eingeblasen.In normal operation of the fuel supply system, for example, hydrogen is stored in the two tanks 100, 110 under a pressure of up to 300 bar. The Tankabsperrventile 500, 510 and the check valve 400 in the fuel line 50 are open. In this respect, in the common fuel line 50 to the pressure regulator, the tank pressure of, for example, <300 bar and is measured via the third pressure sensor 220. The pressure regulator 300 reduces the applied pressure, so that downstream of the pressure regulator 300, for example, a pressure of 2 to 6 bar is applied in the fuel line. With this low pressure, the fuel is then blown into the combustion chamber of an internal combustion engine, not shown, via the injection valves 700.
In einem Störfall oder bei besonderen Betriebsbedingungen ist es vorgesehen, die Absperrventile 500, 510, 400 zu schließen. Liegt beispielsweise eine Leckage der Einblaseventile 700 oder der Kraftstoffleitung vor, wird so ein Entweichen des Kraftstoffs in die Umwelt vermieden. Aufgrund der hohen Sicherheitsrelevanz der Absperrventile ist es wünschenswert, die Absperrwirkung der Absperrventile rou- tinemäßig zu überprüfen.In the event of a malfunction or under special operating conditions, it is planned to close the shut-off valves 500, 510, 400. For example, if there is a leakage of the injection valves 700 or the fuel line, so escape of the fuel is avoided in the environment. Due to the high safety relevance of the shut-off valves, it is desirable to check the shut-off effect of the shut-off valves routinely.
Zur Überprüfung der Absperrwirkung bzw. der Dichtheit eines Absperrventils ist es erfindungsgemäß vorgesehen, das Absperrventil 400 zu schließen und den Kraftstoff druck stromabwärts des Absperrventils 400 zu überwachen, wobei das Einblasventil 700 weiterhin zum Betreiben der Brennkraftmaschine betätigt wird. Ausgehend von den bekannten Betriebsbedingungen wie Druck und ggf. Temperatur in der Kraftstoff leitung sowie der Einblasdauer des Einblasventils 700 lässt sich eine Kraftstoff masse ermittelt, die in den Brennraum einströmt. Die eingeblasene Kraftstoff masse reduziert die Kraftstoffmasse in der Kraftstoffleitung und führt, bei einem geschlossenen und dicht schließenden Absperrventil 400, zu einer Druckabsenkung in der Kraftstoff leitung. Erfolgt die Druckabsenkung nicht in der erwarteten Weise ist davon auszugehen, dass Kraftstoff in die Kraftstoffleitung über das Absperrventil nachströmt.To check the shut-off or the tightness of a shut-off valve, it is provided according to the invention to close the shut-off valve 400 and to monitor the fuel pressure downstream of the shut-off valve 400, wherein the injection valve 700 is further actuated to operate the internal combustion engine. Starting from the known operating conditions such as pressure and possibly temperature in the fuel line and the injection duration of the injection valve 700, a fuel mass can be determined, which flows into the combustion chamber. The injected fuel mass reduces the fuel mass in the fuel line and leads, in a closed and tight-fitting shut-off valve 400, to a pressure reduction in the fuel line. If the pressure reduction does not occur in the expected manner, it can be assumed that fuel will flow into the fuel line via the shut-off valve.
Mit jedem Einblasvorgang reduziert sich auch der zu erwartende Kraftstoffdruck in der Kraftstoffleitung stromabwärts des geschlossenen Absperrventils. Mit zunehmender Anzahl von Einblasvorgängen steigt somit der Differenzdruck zwischen der stromauf- und abwärtigen Seiten des Absperrventils.Each injection process also reduces the expected fuel pressure in the fuel line downstream of the closed shut-off valve. As the number of injections increases, the differential pressure between the upstream and downstream sides of the shut-off valve thus increases.
Erfindungsgemäß kann es daher auch vorgesehen sein, den Differenzdruck über dem Absperrventil zu überwachen.Therefore, according to the invention, it may also be provided to monitor the differential pressure across the shut-off valve.
Ferner kann es auch vorgesehen sein einen Schwellenwert oberhalb des erwarteten Kraftstoffdrucks festzulegen, bei dem die Sperrwirkung des Absperrventil 400 noch als ausreichend toleriert wird. Der Schwellenwert ist entsprechend der über das Einblasventil abströmenden Kraftstoff masse nachzuführen.Furthermore, it may also be provided to set a threshold above the expected fuel pressure at which the blocking effect of the shut-off valve 400 is still tolerated as sufficient. The threshold value has to be tracked in accordance with the fuel mass flowing out via the injection valve.
Um die Genauigkeit der Überprüfung der Absperrwirkung weiter zu verbessern, besteht die Möglichkeit stromabwärts des Druckreglers mit dem vierten Druck- sensor 230 den Druck zu überprüfen. Hierzu ist der Druck stromabwärts des zu prüfenden geschlossenen Absperrventils 400 durch Ausblasen des Kraftstoffs über die Einblasventile 700 auf einen Druck unterhalb der Druckregelschwelle abzusenken. Liegt die Druckregelschwelle des Druckreglers 300 beispielsweise bei 6 bar wäre der Druck auf unter 6 bar also beispielsweise 2 bar einzustellen. Unter diesen Bedingungen ist der Druckregler 300 vollständig geöffnet und derIn order to further improve the accuracy of checking the shut-off effect, it is possible to check the pressure downstream of the pressure regulator with the fourth pressure sensor 230. For this purpose, the pressure downstream of the closed shut-off valve 400 to be tested is lowered by blowing out the fuel via the injection valves 700 to a pressure below the pressure control threshold. If the pressure control threshold of the pressure regulator 300 is, for example, 6 bar, the pressure would be below 6 bar, for example 2 bar. Under these conditions, the pressure regulator 300 is fully open and the
Drucksensor 230 misst somit den Druck direkt an der stromabwärts liegenden Seite des Absperrventils 400. Dieses Vorgehen hat den Vorteil, dass zum einen der Differenzdruck am Absperrventil 400 möglichst groß wird und zum anderen reagiert der vierte Drucksensor 230 im Niederdruckbereich empfindlicher bedingt durch den kleineren Messbereich als der dritte Drucksensor 220 im Hochdruck- bereich. Die Genauigkeit und Zuverlässigkeit der Messung nimmt somit zu. Zur Verbesserung der Genauigkeit kann durch eine zusätzliche Temperaturerfassung eine exakte Berechnung der Massenzunahme im beobachteten Volumen erfolgen. Die Temperaturmessung kann mit einem Temperatursensor am beobachte- ten Volumen oder einem Tanktemperatursensor erfolgen.Pressure sensor 230 thus measures the pressure directly on the downstream side of the shut-off valve 400. This procedure has the advantage that, on the one hand, the differential pressure at the shut-off valve 400 becomes as large as possible and, on the other hand, the fourth pressure sensor 230 reacts more sensitively in the low-pressure region than through the smaller measuring range the third pressure sensor 220 in the high pressure Area. The accuracy and reliability of the measurement thus increases. To improve the accuracy, an additional calculation of the mass increase in the observed volume can be carried out by an additional temperature detection. The temperature can be measured with a temperature sensor at the observed volume or a tank temperature sensor.
Selbstverständlich sind auch andere Ausführungen eines erfindungsgemäßen Kraftstoffversorgungssystems denkbar. So kann beispielsweise auf einen ersten und zweiten Drucksensor 200, 210 verzichtet werden und der Kraftstoff druck auf andere Art und Weise oder beispielsweise über den dritten Drucksensor 220 ermittelt werden.Of course, other embodiments of a fuel supply system according to the invention are conceivable. For example, can be dispensed with a first and second pressure sensor 200, 210 and the fuel pressure in other ways or for example via the third pressure sensor 220 can be determined.
Auch kann es vorgesehen sein, nur einen Kraftstofftank oder auch mehr als zwei Kraftstofftanks zu betreiben.It may also be provided to operate only one fuel tank or more than two fuel tanks.
Das erfindungsgemäße Verfahren ist ferner nicht nur auf die Diagnose eines Absperrventils 400 beschränkt. Insbesondere können auch die beiden Tankventile 500, 510 auf Ihre Absperrwirkung untersucht werden.The method according to the invention is furthermore not limited to the diagnosis of a shut-off valve 400. In particular, the two tank valves 500, 510 can be examined for their shut-off.
Wird die Diagnose beispielsweise bei hoher Last durchgeführt, besteht die Gefahr, dass der Kraftstoffdruck mit einem großen Gradienten stromabwärts des geschlossenen Absperrventils einen kritischen Druck unterschreitet und ein Betrieb der Brennkraftmaschine nicht mehr möglich ist. Um dies zu vermeiden, ist sinnvoller Weise eine Druckschwelle vorgesehen, unterhalb der die Diagnose nicht durchgeführt wird, bzw. eine Lastschwelle oberhalb der die Diagnose nicht durchgeführt wird.If the diagnosis is carried out, for example, at high load, there is the risk that the fuel pressure with a large gradient downstream of the closed shut-off valve falls below a critical pressure and operation of the internal combustion engine is no longer possible. In order to avoid this, a pressure threshold is expediently provided below which the diagnosis is not carried out, or a load threshold above which the diagnosis is not carried out.
Liegt eine geringe Lastanforderung vor, wird das Absperrventil solange geschlossen, bis der Kraftstoffdruck stromabwärts des Absperrventils erkennbar abgefallen ist. Dies ermöglicht den weiteren Betrieb der Brennkraftmaschine als auch die Durchführung der Diagnose. Während des geschlossenen Absperrventils wird die eingespritzte Kraftstoffmasse akkumuliert und mit einem für dieses Absperrventil definierten Maximalwert verglichen, bei dem ein Druckabfall erkennbar ist. Der definierte zulässige Maximalwert der akkumulierten eingespritzten Kraftstoffmasse kann beispielsweise im Vorfeld ermittelt werden und ggf. in Kennfeldern zum Abruf abgelegt werden. Wird der abgelegte zulässige Maximalwert ü- berschritten, wird das Absperrventil als fehlerhaft erkannt.If there is a low load request, the shut-off valve is closed until the fuel pressure downstream of the shut-off valve has noticeably dropped. This allows the further operation of the internal combustion engine as well as the implementation of the diagnosis. During the closed shut-off valve, the injected fuel mass is accumulated and compared to a maximum value defined for that shut-off valve at which a pressure drop is detectable. The defined permissible maximum value of the accumulated injected fuel mass can be determined, for example, in advance and, if necessary, stored in maps for retrieval. If the stored permissible maximum value is exceeded, the shut-off valve is detected as faulty.
Alternativ kann auch eine geeignete maximal zulässige Öffnungszeit des Absperrventils abgelegt werden. Ferner ist es auch möglich, eine zweite Druckschwelle vorzusehen, ab der das Absperrventil wieder zu schließen ist. Auch ist es denkbar, das Absperrventil periodisch zu betreiben.Alternatively, a suitable maximum permissible opening time of the shut-off valve can also be stored. Furthermore, it is also possible to provide a second pressure threshold, from which the shut-off valve is closed again. It is also conceivable to operate the shut-off valve periodically.
Ferner kann es vorgesehen sein, die als nicht ausreichend erkannt Absperrwirkung des Absperrventils in einem Fehlerspeicher abzulegen.Furthermore, it may be provided to store the blocking effect of the shut-off valve, which is not recognized as sufficient, in a fault memory.
Weiterhin kann es vorgesehen sein, die Diagnose in festgelegten Intervallen oder nach einer definierten Zeit vorzunehmen. Hierbei kann es beispielsweise auch vorgesehen sein, dass die Absperrwirkung nur dann als nicht ausreichend erkannt wird, wenn dies in mehreren Diagnosen festgestellt wurde.Furthermore, it may be provided to carry out the diagnosis at fixed intervals or after a defined time. In this case, it can also be provided, for example, that the shut-off effect is only recognized as insufficient if this has been established in several diagnoses.
Darüber hinaus kann es vorgesehen sein, das während der Leckdiagnose weite- re Diagnosen, insbesondere elektrische Diagnosen des Absperrventils durchgeführt werden, wie beispielsweise eine Diagnose auf Leitungsunterbrechung oder Kurzschluss nach Versorgungsspannung. Durch ein solches Vorgehen ist in einfacher Art und Weise eine Fehlerunterscheidung zwischen Endstufe und Komponente (Ventil) möglich. In addition, it may be provided that further diagnoses during the leak diagnosis, in particular electrical diagnostics of the shut-off valve, are carried out, such as a diagnosis for line interruption or short-circuit to the supply voltage. By such a procedure, a fault differentiation between the power amplifier and component (valve) is possible in a simple manner.

Claims

Ansprüche claims
1. Verfahren zur Diagnose eines Absperrventils (400, 500, 510) in einer Kraftstoffleitung (50), wobei das Absperrventil (400, 500, 510) in der Kraftstoff leitung (50) zwi- sehen mindestens einem Tank (100, 110) und mindestens einem Einblasventil (70) angeordnet ist, wobei ein Kraftstoffdruck stromabwärts des Absperrventils (400, 500, 510) erfasst wird, wobei Kraftstoff über ein Einblasventil in einen Brennraum eingelassen wird, wobei zur Diagnose das Absperrventil (400, 500, 510) geschlossen wird, dadurch gekennzeichnet, dass eine über das Einblasventil eingelassene Kraftstoffmasse ermittelt wird, dass ausgehend von der eingelassenen Kraftstoffmasse ein stromabwärts zu erwartender Kraftstoffdruck ermittelt wird, und dass die Absperrwirkung des Absperrventils (400, 500, 510) als nicht ausreichend erkannt wird, wenn der Kraftstoff druck stromabwärts des Absperrventils (400, 500, 510) von dem erwarteten Kraftstoffdruck abweicht.A method of diagnosing a shut-off valve (400, 500, 510) in a fuel line (50), wherein the shut-off valve (400, 500, 510) in the fuel line (50) between at least one tank (100, 110) and at least one inflation valve (70) is arranged, wherein a fuel pressure downstream of the check valve (400, 500, 510) is detected, wherein fuel is introduced via a blow-in in a combustion chamber, wherein the check valve (400, 500, 510) is closed for diagnosis in that a fuel mass introduced via the blow-in valve is determined, that a fuel pressure which is to be expected downstream is determined on the basis of the introduced fuel mass and that the blocking effect of the shut-off valve (400, 500, 510) is not recognized as sufficient if the fuel pressure downstream of the shut-off valve (400, 500, 510) deviates from the expected fuel pressure.
2. Verfahren nach Anspruch 1, bei dem die Absperrwirkung des Absperrventils (400, 500, 510) als nicht ausreichend erkannt wird, wenn der Kraftstoffdruck stromabwärts des Absperrventils (400, 500, 510) den erwarteten Kraftstoffdruck übersteigt und/oder von einem zu erwartenden Druckverlauf abweicht.2. The method of claim 1, wherein the shut-off of the shut-off valve (400, 500, 510) is recognized as insufficient when the fuel pressure downstream of the shut-off valve (400, 500, 510) exceeds the expected fuel pressure and / or expected Pressure course deviates.
3. Verfahren nach mindestens einem der vorhergehenden Ansprüche, bei dem beim Abstellen der Brennkraftmaschine das Absperrventil (400, 500, 510) geschlossen wird, und die Brennkraftmaschine solange betrieben wird, bis die Diagnose abgeschlossen ist. 3. The method according to at least one of the preceding claims, wherein when stopping the internal combustion engine, the shut-off valve (400, 500, 510) is closed, and the internal combustion engine is operated until the diagnosis is completed.
4. Verfahren nach mindestens einem der vorhergehenden Ansprüche, bei dem bei der Messung des Drucks in der Kraftstoff leitung (50) eine Größe, die eine Temperatur des Kraftstoffs kennzeichnet, berücksichtigt wird.4. The method according to at least one of the preceding claims, wherein in the measurement of the pressure in the fuel line (50) is taken into account a size that indicates a temperature of the fuel.
5. Verfahren nach mindestens einem der vorhergehenden Ansprüche, bei dem aus Druck und Temperatur eine Kraftstoffmasse in der Kraftstoff leitung (50) ermittelt wird, und die Absperrwirkung des Absperrventils (400, 500, 510) als nicht ausreichend erkannt wird, wenn die Kraftstoffmasse in der Kraftstoffleitung (50) nicht entsprechend der eingelassenen Kraftstoff masse abnimmt.5. The method according to at least one of the preceding claims, wherein from pressure and temperature, a fuel mass in the fuel line (50) is determined, and the shut-off of the shut-off valve (400, 500, 510) is recognized as insufficient if the fuel mass in the fuel line (50) does not decrease according to the embedded fuel mass.
6. Kraftstoffversorgungssystem mit mindestens einem Tank (100, 110), einem Einblasventil (70) und einem Absperrventil (400, 500, 510) und einem Steuergerät, dadurch gekennzeichnet, dass das Steuergerät zur Diagnose das Absperrventil (400, 500, 510) ein6. Fuel supply system with at least one tank (100, 110), a Einblasventil (70) and a shut-off valve (400, 500, 510) and a control unit, characterized in that the control unit for diagnosis, the shut-off valve (400, 500, 510) a
Stellmittel und ein Überwachungsmittel aufweist, wobei das Stellmittel derart ausgestaltet sind, dass die Stellmittel zu Diagnose eines Absperrventils (400, 500, 510) das Absperrventil (400, 500, 510) schließt, - wobei das Überwachungsmittel der eingerichtet ist, dass es einen Kraft- stoffdruck stromabwärts des Absperrventils (400, 500, 510) überwacht, und in Abhängigkeit einer über ein Einblasventil in einen Brennraum eingelassene Kraftstoffmasse einen erwarteten Kraftstoffdruck ermittelt und eine mangelnde Absperrwirkung des Absperrventils (400, 500, 510) erkennt, wenn der Kraftstoffdruck stromabwärts des Absperrventils (400, 500, 510) den erwarteten Kraftstoffdruck übersteigt. Adjusting means and a monitoring means, wherein the adjusting means are configured such that the adjusting means for diagnosing a shut-off valve (400, 500, 510) closes the shut-off valve (400, 500, 510), - wherein the monitoring means is adapted that there is a force monitored fuel pressure downstream of the shut-off valve (400, 500, 510), and depending on an inset via a blow-in in a combustion chamber fuel mass an expected fuel pressure determined and a lack of Absperrwirkung the check valve (400, 500, 510) detects when the fuel pressure downstream of the Stop valve (400, 500, 510) exceeds the expected fuel pressure.
EP08708931A 2007-03-30 2008-02-13 Method for the diagnosis of a shut-off valve Withdrawn EP2132473A1 (en)

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