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)
• General Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Health & Medical Sciences (AREA)
• Biomedical Technology (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)

Applications Claiming Priority (2)

Publications (1)

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• 2007
  • 2007-03-30 DE DE102007015783A patent/DE102007015783A1/de not_active Withdrawn
• 2008
  • 2008-02-13 RU RU2009139911/06A patent/RU2009139911A/ru not_active Application Discontinuation
  • 2008-02-13 KR KR1020097020313A patent/KR20100014658A/ko not_active Application Discontinuation
  • 2008-02-13 EP EP08708931A patent/EP2132473A1/de not_active Withdrawn
  • 2008-02-13 WO PCT/EP2008/051707 patent/WO2008119588A1/de active Application Filing
  • 2008-02-13 JP JP2010500167A patent/JP2010521625A/ja active Pending
  • 2008-02-13 BR BRPI0808027-5A2A patent/BRPI0808027A2/pt not_active IP Right Cessation
  • 2008-02-13 CN CN200880010639A patent/CN101646892A/zh active Pending

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