WO2007042388A1 - Procede de diagnostic d'une soupape d'arret - Google Patents

Procede de diagnostic d'une soupape d'arret Download PDF

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Publication number
WO2007042388A1
WO2007042388A1 PCT/EP2006/066670 EP2006066670W WO2007042388A1 WO 2007042388 A1 WO2007042388 A1 WO 2007042388A1 EP 2006066670 W EP2006066670 W EP 2006066670W WO 2007042388 A1 WO2007042388 A1 WO 2007042388A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
shut
fuel
pressure
downstream
Prior art date
Application number
PCT/EP2006/066670
Other languages
German (de)
English (en)
Inventor
Thorsten Allgeier
Winfried Langer
Juergen Foerster
Jens Thurso
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 WO2007042388A1 publication Critical patent/WO2007042388A1/fr

Links

Classifications

    • 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
    • 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
    • F02D19/026—Measuring or estimating parameters related to the fuel supply system
    • F02D19/027—Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position
    • 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
    • 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
    • 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
    • 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
    • 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
    • F02D19/021—Control of components of the fuel supply system
    • F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection
    • 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 is based on 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 systems so-called CNG (compressed natural gas) 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 regulating module itself often also has a valve function, which shuts off the low pressure region from the high pressure region in the event of excessively high pressures in order to prevent the injection valves or injection valves from reliably opening when the pressures are too high.
  • shut-off devices Due 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 special interest to check the shut-off effect of the shut-off devices / valves in advance preferably routinely and to initiate a warning or an error reaction in the case of a lack of shut-off effect.
  • US Pat. No. 6,427,670 B2 discloses, by way of example, a CNG system in which fuel is stored under pressure in a tank and fed to injection valves via a fuel line. After switching off the internal combustion engine and closing the tank valves, it is provided to check the fuel pressure in the fuel line, whereby external leakage - fuel leakage to the environment - is detected when 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 mittein on its Absperrrial - ie internal leakage - can be checked.
  • the shut-off valve is closed and then set downstream of the closed shut-off valve, a fuel pressure which is smaller than the fuel pressure upstream of the shut-off valve. Thereafter, the fuel pressure downstream of the closed check valve is monitored, and the shut-off action of the valve is found to be insufficient when the pressure in the fuel line downstream of the valve increases.
  • a fuel supply system having the features of the independent apparatus claim is likewise advantageous.
  • a control unit is provided which closes a shut-off valve for diagnosis and sets a fuel pressure downstream of the shut-off valve which is smaller than upstream of the shut-off valve and thereafter closes the injection valves, and the control unit detects a lack of shut-off of the shut-off valve when the pressure in the fuel line rises downstream of the shut-off valve.
  • Valve is set in a first mode of an internal combustion engine, and the fuel pressure downstream of the check valve is monitored in a second mode of the internal combustion engine.
  • the first mode of operation could, for example, be selected such that the fuel located downstream of the closed shut-off valve is injected into a combustion chamber of an internal combustion engine and burnt there. By this fuel consumption, the amount of fuel decreases downstream of the closed check valve and the fuel pressure decreases in the desired manner.
  • the second operating mode is preferably selected so that the injection valves remain closed, for example, in a coasting operation of the internal combustion engine or also an operation of the internal combustion engine with a further combustion method without using the injection valves.
  • a further advantageous embodiment provides for using a first fuel in the first operating mode and a second fuel in the second operating mode.
  • a first fuel in the first operating mode may be advantageous to operate in a first operating mode with hydrogen, natural gas, liquid gas or similar compressed media, and in the second operating mode with liquid fuel such as gasoline or diesel or with an electric motor (hybrid).
  • the first operating mode preferably takes place via the injection valves and the second operating mode via additional valves or other devices.
  • the injection valves remain closed during operation in the second operating mode and the diagnosis of the shut-off valve can be carried out according to the invention.
  • the at least one blow-off valve is periodically briefly opened in order to reduce the fuel pressure downstream of the closed valve. So that by the periodic opening in an advantageous manner, the fuel pressure can be controlled controlled.
  • 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 when the fuel mass in the fuel line rises downstream of the valve.
  • FIG. 1 An example of a fuel supply system according to the invention is shown in FIG.
  • FIG. 1 schematically shows a fuel supply system for the operation of an internal combustion engine with LPG or compressed gas, for example or hydrogen or natural gas.
  • the fuel is stored in the embodiment shown in a first and second tank 100, 110 under pressure.
  • the pressure of the first and second tank 100, 110 under pressure.
  • Tank 100, 110 located fuel, and thus indirectly 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 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 ,
  • 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. If, for example, there is a leakage of the blow-in valves 700 or the fuel line, then an escape of the fuel in the
  • the shut-off valve 400 For checking the shut-off valve 400 shown in FIG. 1, the shut-off valve 400 would first have to be closed. Upstream of the shut-off valve 400 is then the tank pressure with, for example, 300 bar. To lower the pressure downstream of the shut-off valve 400, for example, one option would be to continue to operate the internal combustion engine. Through the injection valves 700, the fuel of the internal combustion engine is supplied to the combustion, whereby the amount of fuel downstream of the check valve 400 decreases and the pressure in the fuel line decreases. At a specified differential pressure, for example. Of 150 bar - i. 300 bar upstream of the shut-off valve 400 and 50 bar downstream of the valve measured on the third pressure sensor
  • the operation of the internal combustion engine is stopped and the injection valves 700 are closed.
  • the pressure at the pressure sensor 220 should change in time only in the context of temperature changes.
  • the shut-off valve 400 closes insufficiently.
  • 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 reacts to the other the fourth pressure sensor 230 in the low-pressure region is more sensitive due to the smaller measuring range than the third pressure sensor 220 in the high-pressure region. 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 measurement can be done with a temperature sensor on the observed volume or a tank temperature sensor.
  • Pressure sensor 200, 210 are dispensed with and the fuel pressure can be determined in other ways or for example via the third pressure sensor 220. It may also be provided to operate only one fuel tank or more than two fuel tanks.
  • 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.
  • the diagnosis according to the invention can always be carried out when there is an operating state of the internal combustion engine which does not require opening of the injection valves, that is to say a fuel supply.
  • the diagnosis can thus be made, for example, when the vehicle is parked or parked, or during a fuel cut.
  • the shut-off valve is preferably already closed during operation of the internal combustion engine with low load. Due to the ongoing low-load operation, fuel is requested and the fuel pressure drops downstream of the shut-off valve. If then a fuel cutoff is already a suitable pressure downstream of the check valve before and a diagnosis according to the invention can be performed.
  • a pressure threshold is expediently provided in which, when the fuel pressure falls below the pressure threshold, the shut-off valve is opened again.
  • the shut-off valve is preferably opened only briefly when it reaches or falls below it, so that the fuel pressure downstream of the shut-off valve increases only slightly.
  • a suitable differential pressure at the shut-off valve for the diagnosis according to the invention is still maintained.
  • Suitable opening times of the shut-off valve can be determined, for example, in advance and possibly stored in maps for retrieval.
  • two-fuel systems when operating with a first fuel, which is introduced via the injection valves in the combustion chamber of the internal combustion engine, to close a shut-off valve and to set a suitable pressure downstream of the shut-off valve.
  • the two-fuel system makes it possible to switch to a second fuel, which can then be introduced into the combustion chamber independently of the injection valves and thus allows further operation of the internal combustion engine, while the injection valves can remain closed and a diagnosis according to the invention can be carried out.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

L'invention concerne un procédé de diagnostic d'une soupape d'arrêt dans une conduite de carburant. La soupape d'arrêt de la conduite de carburant est implantée entre au moins un réservoir et au moins une soupape d'injection avec les opérations suivantes: fermeture de la soupape d'arrêt ; réglage d'une pression de carburant, en aval de la soupape d'arrêt fermée, inférieure à la pression de carburant en amont de la soupape d'arrêt ; surveillance, lorsque la soupape d'injection est fermée, de la pression de carburant en aval de la soupape d'arrêt, l'action d'arrêt de la soupape étant reconnue insuffisante si la pression régnant dans la conduite de carburant en aval de la soupape augmente.
PCT/EP2006/066670 2005-10-07 2006-09-25 Procede de diagnostic d'une soupape d'arret WO2007042388A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005048456A DE102005048456A1 (de) 2005-10-07 2005-10-07 Verfahren zur Diagnose eines Absperrventils
DE102005048456.5 2005-10-07

Publications (1)

Publication Number Publication Date
WO2007042388A1 true WO2007042388A1 (fr) 2007-04-19

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PCT/EP2006/066670 WO2007042388A1 (fr) 2005-10-07 2006-09-25 Procede de diagnostic d'une soupape d'arret

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DE (1) DE102005048456A1 (fr)
WO (1) WO2007042388A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2177741A1 (fr) * 2008-10-15 2010-04-21 Magneti Marelli Powertrain S.p.A. Procédé pour le diagnostic d'un système d'alimentation en carburant gazeux pour moteur à combustion interne
EP2565431A1 (fr) * 2011-08-31 2013-03-06 MAN Diesel & Turbo SE Procédé de surveillance de clapets anti-retour placés dans les conduites d'alimentation en gaz d'un moteur à gaz
US9004050B2 (en) 2012-04-19 2015-04-14 Ford Global Technologies, Llc Gaseous fuel rail sensor diagnostics
US9482176B2 (en) 2012-06-13 2016-11-01 Ford Global Technologies, Llc System and method for compensating gaseous fuel injection

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015783A1 (de) 2007-03-30 2008-10-02 Robert Bosch Gmbh Verfahren zur Diagnose eines Absperrventils
JP5425677B2 (ja) * 2010-03-19 2014-02-26 株式会社ケーヒン 燃料供給システム及び遮断弁故障診断装置
EP2915984B1 (fr) * 2014-03-07 2017-03-01 Caterpillar Motoren GmbH & Co. KG Supervision d'un injecteur de carburant gazeux d'un moteur à combustibles au cours d'une opération de combustible liquide
WO2018051159A1 (fr) * 2016-09-16 2018-03-22 Carrier Corporation Commande de circuit de carburant pour moteur d'unité de réfrigération
DE102021204058B3 (de) 2021-04-23 2022-09-22 Vitesco Technologies GmbH Verfahren und Vorrichtung zur Diagnose eines Absperrventils eines Fluidsystems

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284785A1 (fr) * 1987-03-16 1988-10-05 G. Kromschröder Aktiengesellschaft Méthode et dispositif pour le contrôle de l'étanchéité de deux vannes disposées successivement sur un conduit de fluide
JP2000303909A (ja) * 1999-04-22 2000-10-31 Honda Motor Co Ltd 車両用ガス燃料供給システム
EP1243772A2 (fr) * 2001-03-23 2002-09-25 C.R.F. Società Consortile per Azioni Système de diagnose pour des fuites des systèmes de refoulement à gaz et procédé d'inspection des soupapes de ces systèmes
WO2005073687A1 (fr) * 2004-01-30 2005-08-11 Siemens Schweiz Ag Procede pour tester l'etancheite d'une voie d'alimentation en gaz

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284785A1 (fr) * 1987-03-16 1988-10-05 G. Kromschröder Aktiengesellschaft Méthode et dispositif pour le contrôle de l'étanchéité de deux vannes disposées successivement sur un conduit de fluide
JP2000303909A (ja) * 1999-04-22 2000-10-31 Honda Motor Co Ltd 車両用ガス燃料供給システム
EP1243772A2 (fr) * 2001-03-23 2002-09-25 C.R.F. Società Consortile per Azioni Système de diagnose pour des fuites des systèmes de refoulement à gaz et procédé d'inspection des soupapes de ces systèmes
WO2005073687A1 (fr) * 2004-01-30 2005-08-11 Siemens Schweiz Ag Procede pour tester l'etancheite d'une voie d'alimentation en gaz

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2177741A1 (fr) * 2008-10-15 2010-04-21 Magneti Marelli Powertrain S.p.A. Procédé pour le diagnostic d'un système d'alimentation en carburant gazeux pour moteur à combustion interne
EP2565431A1 (fr) * 2011-08-31 2013-03-06 MAN Diesel & Turbo SE Procédé de surveillance de clapets anti-retour placés dans les conduites d'alimentation en gaz d'un moteur à gaz
US9004050B2 (en) 2012-04-19 2015-04-14 Ford Global Technologies, Llc Gaseous fuel rail sensor diagnostics
US9482176B2 (en) 2012-06-13 2016-11-01 Ford Global Technologies, Llc System and method for compensating gaseous fuel injection

Also Published As

Publication number Publication date
DE102005048456A1 (de) 2007-04-12

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