CN100520018C - Diagnosing system and method of LPI engine - Google Patents

Diagnosing system and method of LPI engine Download PDF

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Publication number
CN100520018C
CN100520018C CNB2006100757483A CN200610075748A CN100520018C CN 100520018 C CN100520018 C CN 100520018C CN B2006100757483 A CNB2006100757483 A CN B2006100757483A CN 200610075748 A CN200610075748 A CN 200610075748A CN 100520018 C CN100520018 C CN 100520018C
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CN
China
Prior art keywords
petrolift
relay
shutoff valve
fuel
lpi
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Expired - Fee Related
Application number
CNB2006100757483A
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Chinese (zh)
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CN101059104A (en
Inventor
金德烈
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Hyundai Motor Co
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Hyundai Motor Co
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Publication of CN101059104A publication Critical patent/CN101059104A/en
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • 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
    • 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
    • F02D19/022—Control of components of the fuel supply system to adjust the fuel pressure, temperature or composition
    • 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
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • 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
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • 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

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

Abstract

The present invention relates to a diagnostic system and diagnostic method of the LPI engines, which is provided with the advantage that it can diagnose the malfunction of the electric relay in the fuel pump quickly with continuously supervising the output electric tension of the electric relay in the fuel pump. The invention includes: a high pressure container which is provided with the driver of the fuel pump and the first cut-off valve; the pressure regulator provided with pressure sensor and the second cut-off valve; the electric relay unit provided with fuel pump electric relay and main relay; the LPG switch which is used to cut off the fuel supplying to the engine in case of emergency; and LPI ECU, which is connected to the fuel pump, the first cut-off valve, the second cut-off valve, the electric relay unit and the LPG switch, is used to control their operation, wherein the LPI ECU is provided with the failure diagnosis unit which is used to diagnose the malfunction of the fuel pump electric relay.

Description

LPI engine diagnosis system and method
The cross reference of related application
The application number that the application requires on April 17th, 2006 to apply in Korea S Department of Intellectual Property is that the korean patent application of 10-2006-0034611 is a preference, quotes its full content here.
Technical field
The present invention relates to the diagnostic system and the method for liquefied petroleum injection (LPI) motor.More specifically, the present invention relates to the diagnostic system and the diagnostic method of LPI motor, it has the advantage of diagnosing petrolift relay fault by the output voltage that continues monitoring petrolift relay rapidly.
Background technique
The LPI motor typically refers to petrolift and is installed in the high-pressure bottle (bombe) and by the LPG fuel that will liquefy and is fed to the motor that is ejected into motor in the sparger again by sparger with liquid form.The LPI motor can spray adjusting, and can solve the variety of issue of traditional LPG system, for example starts the problem that difficulty and outputting power reduce in winter.
As shown in Figure 4, the LPI system comprises high-pressure bottle 1, has the petrolift 2 that is used for liquid fuel is fed to motor E therein; Supply of fuel pipeline 4, one end are connected on the petrolift 2, and the other end is connected on the sparger 7 of motor E; Fuel return pipeline 8, one end are connected on the high-pressure bottle 1, and the other end is connected on the motor E.
Therefore, petrolift 2 supplied fuel are successively by supply of fuel pipeline 4 and sparger 7 and be injected in the firing chamber.Therefore, residual fuel flows back in the high-pressure bottle 1 by fuel return pipeline 8.
The temperature transducer 6 that supply of fuel pipeline 4 has first shutoff valve 3 that is used for fuel shutoff supply when motor E quits work and second shutoff valve 5 and is used to detect fuel temperature.
Fuel return pipeline 8 has the pressure transducer 9 that is used to detect fuel pressure and is used to make fuel pressure to remain on pressure regulator 10 in the prespecified range.
In addition, the LPI system has the LPI electronic control unit (ECU) 12 that is used to control the control unit of engine (ECU) 11 of motor E operation and is used to control supply of fuel.
The following describes the method for traditional control motor E of LPI system.
If ignition switch is connected, ECU 11 control LPI ECU 12 connect main relay (not shown) and petrolift relay (not shown), thereby the energy content of battery is input in the petrolift 2.
Therefore, petrolift 2 is worked and the liquid fuel in the high-pressure bottle 1 is fed in the supply of fuel pipeline 4.
LPI ECU 12 opens first shutoff valve 3 and second shutoff valve 5, thereby liquid fuel is fed in the sparger 7.
Afterwards, disconnect if ECU 11 detects ignition switch, then ECU 11 control LPIECU 12 disconnect main relay and petrolift relay.In addition, LPI ECU 12 closes first shutoff valve 3 and second shutoff valve 5, thereby no longer supplies fuel among the motor E.
According to traditional LPI system, when the petrolift relay breaks down, no longer be petrolift 2, first shutoff valve 3 and second shutoff valve, 5 supply electric energy.
Therefore, when the petrolift relay was in simple fault state, petrolift 2 quit work, and first shutoff valve 3 and second shutoff valve 5 are also closed simultaneously.Therefore, the supply of fuel of motor E is completely severed, and motor E quits work.Therefore, if above-mentioned condition occurs, then can cause fatal accident when vehicle driving.
In addition, when the petrolift relay is in simple fault state, owing to supply of fuel is completely severed, so the driver can not reset motor.
Therefore, must carry out trailer to keep in repair.
In addition, although the petrolift relay is simple fault, owing to do not have the storage failure sign indicating number, thus must check all starting units, to find failure cause.
Disclosed above-mentioned information is just in order to understand background of the present invention better in background technique, so it can comprise the content that does not constitute prior art well known by persons skilled in the art.
Summary of the invention
The present invention tries hard to provide a kind of diagnostic system and diagnostic method of LPI motor, and it has the output voltage that continues monitoring petrolift relay and judge the petrolift relay whether fault is with the convenient advantage of maintenance rapidly.
In addition, the present invention can prevent that the motor that causes owing to petrolift relay fault from stopping when vehicle driving, thereby has the advantage of safety traffic.
The LPI engine diagnosis system comprises according to an embodiment of the invention: high-pressure bottle, and it has first shutoff valve that is used to control the petrolift driver of petrolift operation and is used to cut off fuel cut engine; Pressure regulator, it has second shutoff valve that is used to detect the pressure transducer of fuel pressure and is used to cut off fuel cut engine; Relay unit, it has petrolift relay and main relay; The LPG switch is used in case of emergency cutting off the supply of fuel of motor; And LPI ECU, it is electrically connected on petrolift driver, first shutoff valve, second shutoff valve, relay unit and the LPG switch, is used to control their operation, and wherein LPI ECU has failure diagnosis unit, is used to diagnose the fault of petrolift relay.
When can being less than or equal to preset reference voltage at the output voltage of petrolift relay, failure diagnosis unit determines that the petrolift relay breaks down.
Preset reference voltage can be 5V.
Wherein, failure diagnosis unit can all determine that the petrolift relay breaks down during fault at petrolift, first shutoff valve and second shutoff valve.
The diagnostic method of LPI motor comprises according to an embodiment of the invention: whether the ignition switch of judging motor is connected; If judge the igniting switch connection, then connect main relay and petrolift relay; The operation petrolift is also opened first shutoff valve and second shutoff valve; Judge whether the LPG switch is connected; If judge the LPG switch connection, then compare the output voltage and the preset reference voltage of petrolift relay; If the output voltage of petrolift relay is less than or equal to preset reference voltage, then determine petrolift relay fault, and the storage failure sign indicating number.
Disconnect if judge the LPG switch, then this diagnostic method also comprises: close petrolift; Stop the operation of petrolift and close first and second shutoff valves.
If the output voltage of petrolift relay is greater than preset reference voltage, then this diagnostic method also comprises: judge whether ignition switch disconnects; If ignition switch disconnects, then close main relay and petrolift relay; And stop the operation of petrolift and close first and second shutoff valves.
Preset reference voltage can be 5V.
Diagnostic method according to the LPI motor of second embodiment of the invention comprises: whether the ignition switch of judging motor is connected; If judge the igniting switch connection, then connect main relay and petrolift relay; The operation petrolift is also opened first shutoff valve and second shutoff valve; Judge whether the LPG switch is connected; If judge the LPG switch connection, judge whether that then petrolift, first shutoff valve and second shutoff valve all have fault; If petrolift, first shutoff valve and second shutoff valve all break down, determine that then the petrolift relay breaks down, and the storage failure sign indicating number.
Disconnect if judge the LPG switch, then second embodiment's diagnostic method also comprises: close the petrolift relay; Stop the operation of petrolift and close first and second shutoff valves.
If any one does not all break down in petrolift, first shutoff valve and second shutoff valve, then second embodiment's diagnostic method also comprises: judge whether ignition switch disconnects; Disconnect if judge ignition switch, then close main relay and petrolift relay; And stop the operation of petrolift and close first and second shutoff valves.
Description of drawings
Fig. 1 is the schematic representation of the diagnostic system of LPI motor according to an embodiment of the invention.
Fig. 2 represents the flow chart of the diagnostic method of LPI motor according to another embodiment of the present invention.
Fig. 3 is the flow chart of expression according to the diagnostic method of the LPI motor of further embodiment of this invention.
Fig. 4 is the schematic representation of traditional LPI motor.
Embodiment
Describe the diagnostic system of LPI motor according to an embodiment of the invention in detail referring to accompanying drawing 1.
Fig. 1 is the schematic representation of the diagnostic system of LPI motor according to an embodiment of the invention.
As shown in Figure 1, the diagnostic system of LPI motor comprises high-pressure bottle 400, pressure regulator 500, relay unit 300, LPG switch 200 and LPI electronic control unit (ECU) 100 according to an embodiment of the invention.
The liquid fuel of high-pressure bottle 400 storages.High-pressure bottle 400 has petrolift driver 405 that is used to control the petrolift (not shown) operation that is positioned at wherein and first shutoff valve 401 that is used to cut off fuel cut engine.
Pressure regulator 500 remains in the prespecified range fuel pressure, and fuel can be by injector leakage in cylinder like this.Pressure regulator 500 has second shutoff valve 501 that is used to detect the pressure transducer 503 of fuel pressure and is used to cut off fuel cut engine.
Relay unit 300 has the petrolift relay 320 that is used to supply power to the main relay 310 of a plurality of sensors and is used to control 405 work of petrolift driver.
LPG switch 200 is according to driver's the supply of fuel that is controlled at emergency incision broken hair motivation.
LPI ECU 100 comprises shutoff valve control section 120, LPG on-off controller 110, petrolift relay control section 101 and failure diagnosis unit 103.
Shutoff valve control section 120 comprises first driver 121, first switch part 123, second driver 125 and second switch parts 126.
First driver 121 is connected on first shutoff valve 401, and is used to control the operation of first shutoff valve 401.First switch part 123 is according to the control signal operation of first driver 121.
Second driver 125 is connected on second shutoff valve 501, and is used to control the operation of second shutoff valve 501.Second switch parts 126 are according to the control signal operation of second driver 125.
LPG on-off controller 110 comprises switch driver 111 and switch part 113.LPG on-off controller 110 is connected on the LPG switch 200, and the operation of control LPG switch 200.Switch driver 111 is according to the control signal operating switch parts 113 of control unit of engine (not shown) input.
In addition, the output of LPG switch 200 is connected electrically on the LPI ECU 100, and LPI ECU 100 can monitor the operation of LPG switch 200 like this.
Petrolift relay control section 101 is according to the control signal control petrolift relay 320 from the input of control unit of engine (not shown).
Failure diagnosis unit 103 is connected the output of petrolift relay 320, and monitors the output voltage of petrolift relay 320 constantly.If the output voltage of petrolift relay 320 is less than or equal to predetermined voltage, then failure diagnosis unit 103 determines that petrolift relay 320 or its electric distribution break down.Export diagnostic trouble code then and it is stored among the LPI ECU 100.
In addition, failure diagnosis unit 103 monitoring are arranged in the operation of the petrolift driver 405 of high-pressure bottle 400, and judge whether petrolift driver 405 breaks down.In addition, failure diagnosis unit 103 is monitored first shutoff valve 401 that is arranged in high-pressure bottle 400 and the operation that is arranged in second shutoff valve 501 of pressure regulator 500 constantly.Failure diagnosis unit 103 judges whether first shutoff valve 401 and second shutoff valve 501 break down.
Describe the diagnostic method of LPI motor according to another embodiment of the present invention in detail referring to accompanying drawing 2.
Fig. 2 represents the flow chart of the diagnostic method of LPI motor according to another embodiment of the present invention.
As shown in Figure 2, at step S101, LPI ECU 100 judges by communicating by letter with control unit of engine (ECU) whether ignition switch is connected.
Disconnect if judge ignition switch, then the LPI system keeps not starting.If judged the igniting switch connection, then connect main relay 310, and petrolift relay control section 101 is connected petrolift relay 320 at step S102.
When petrolift relay 320 was connected, the electric energy that is input to petrolift relay 320 was supplied in the petrolift.Therefore, at step S103 operation petrolift.
In addition, shutoff valve control section 120 is opened first and second shutoff valves 401 and 501, and like this at step S104, the liquid fuel that pressurizes by the operation petrolift is supplied in the sparger.
Afterwards, when liquid fuel was fed to sparger, at step S105, LPIECU 100 judged whether LPG switch 200 is connected.
Disconnect if judge LPG switch 200, then at step S106, LPI ECU 100 determines that the driver wants to cut off rapidly the supply of fuel of motor.In this case, at step S107, LPI ECU 100 disconnects petrolift relay 320.In addition, at step S108, LPI ECU 100 shut-down operation petrolifts, and close first and second shutoff valves 401 and 501, thus cut off the supply of fuel of motor.
If judge 200 connections of LPG switch, then detect the output voltage of petrolift relay 320, and compare with preset reference voltage at step S110 at step S109 at step S105.
If the output voltage of petrolift relay 320 is less than or equal to preset reference voltage, then at step S115, LPI ECU 100 determines petrolift relay 320 or its electric distribution fault, and at step S116 storage failure sign indicating number.
If greater than preset reference voltage, then at step S111, LPI ECU 100 judges whether ignition switch disconnects at the output voltage of step S110 petrolift relay 320.
Disconnect if judge ignition switch, then disconnect main relay 310 and petrolift relay 320 at step S112, S113 stops petrolift in step.
In addition, close first and second shutoff valves 401 and 501, thereby cut off the supply of fuel of motor at step S114.
Wherein, preset reference voltage can be 5V.
Referring to the diagnostic method of Fig. 3 detailed description according to the LPI motor of further embodiment of this invention.
Fig. 3 is the flow chart of expression according to the diagnostic method of the LPI motor of further embodiment of this invention.
As shown in Figure 3, LPI ECU 100 and control unit of engine interlocking, and judge at step S101 whether ignition switch is connected.
Disconnect if judge ignition switch, then the LPI system keeps not starting state.If judge the igniting switch connection, then connect main relay 310, and petrolift relay control section 101 is connected petrolift relay 320 at step S102.
When petrolift relay 320 was connected, the electric energy that is input to petrolift relay 320 was supplied in the petrolift.Therefore, at step S103 operation petrolift.
In addition, shutoff valve control section 120 is opened first shutoff valve 401 and second shutoff valve 501, and like this at step S104, the liquid fuel that pressurizes by the operation petrolift is supplied in the sparger.
Afterwards, when liquid fuel was fed to sparger, at step S105, LPIECU 100 judged whether LPG switch 200 is connected.
If LPG switch 200 disconnects, then at step S106, LPI ECU 100 determines that the driver wants to cut off rapidly the supply of fuel of motor.In this case, at step S107, LPI ECU 100 disconnects petrolift relay 320.In addition, at step S108, LPI ECU 100 shut-down operation petrolifts, and close first and second shutoff valves 401 and 501, thus cut off the supply of fuel of motor.
If judge 200 connections of LPG switch at step S105, then judge whether that at step S110 ' LPIECU 100 petrolift, first shutoff valve 401 and second shutoff valve 501 all break down.
All break down if judge petrolift, first shutoff valve 401 and second shutoff valve 501, then at step S115, LPI ECU 100 determines that petrolift relay 320 or its electric distribution break down, and at step S116 storage failure sign indicating number.
If any one does not all break down in step S110 ' judgement petrolift, first shutoff valve 401 and second shutoff valve 501, then at step S111, LPI ECU 100 judges whether ignition switch disconnects.
Disconnect if judge ignition switch, then disconnect main relay 310 and petrolift relay 320 at step S112, S113 stops petrolift in step.
In addition, close first shutoff valve 401 and second shutoff valve 501, thereby cut off the supply of fuel of motor at step S114.
Although the present invention has been described, be appreciated that to the invention is not restricted to the disclosed embodiments that on the contrary, various distortion and equivalent structure are included in the design and scope of claims qualification by embodiment.
As mentioned above, the fault of diagnosable petrolift relay of the present invention and electric distribution thereof, and diagnostic trouble code is stored among the LPI ECU.Therefore, but according to the present invention's convenient for maintaining.
In addition, when petrolift relay generation simple fault, motor still keeps work, can under predetermined condition vehicle be sailed to check station like this.

Claims (8)

1. the diagnostic system of a liquefied petroleum injection motor comprises:
High-pressure bottle, it has first shutoff valve that is used to control the petrolift driver of petrolift operation and is used to cut off fuel cut engine;
Pressure regulator, it has second shutoff valve that is used to detect the pressure transducer of fuel pressure and is used to cut off fuel cut engine;
Relay unit, it has petrolift relay and main relay;
The LPG switch is used in case of emergency cutting off the supply of fuel of motor; And
Liquefied petroleum injection ECU, it is connected electrically on petrolift driver, first shutoff valve, second shutoff valve, relay unit and the LPG switch, is used to control their operation,
Wherein liquefied petroleum injection ECU has failure diagnosis unit, is used to diagnose the fault of petrolift relay.
2. diagnostic system according to claim 1, wherein failure diagnosis unit determines that when the output voltage of petrolift relay is less than or equal to preset reference voltage the petrolift relay breaks down.
3. diagnostic system according to claim 2, wherein preset reference voltage is 5V.
4. diagnostic system according to claim 1, wherein failure diagnosis unit determines that when petrolift, first shutoff valve and second shutoff valve all have fault the petrolift relay breaks down.
5. the diagnostic method of a liquefied petroleum injection motor comprises:
Judge whether the ignition switch of motor is connected;
If judge the igniting switch connection, then connect main relay and petrolift relay;
The operation petrolift is also opened first shutoff valve and second shutoff valve;
Judge whether the LPG switch is connected;
If judge the LPG switch connection, then compare the output voltage and the preset reference voltage of petrolift relay; And
If the output voltage of petrolift relay is less than or equal to preset reference voltage, then determine petrolift relay fault, and the storage failure sign indicating number.
6. diagnostic method according to claim 5 also comprises:
Disconnect if judge the LPG switch, then disconnect the petrolift relay;
Stop the operation of petrolift and close first and second shutoff valves.
7. diagnostic method according to claim 5 also comprises:
If the output voltage of petrolift relay, judges then whether ignition switch disconnects greater than preset reference voltage;
Disconnect if judge ignition switch, then disconnect main relay and petrolift relay; And
Stop the operation of petrolift and close first and second shutoff valves.
8. diagnostic method according to claim 5, wherein preset reference voltage is 5V.
CNB2006100757483A 2006-04-17 2006-04-26 Diagnosing system and method of LPI engine Expired - Fee Related CN100520018C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020060034611 2006-04-17
KR1020060034611A KR100748671B1 (en) 2006-04-17 2006-04-17 Diagnosis system and method of lpi engine

Publications (2)

Publication Number Publication Date
CN101059104A CN101059104A (en) 2007-10-24
CN100520018C true CN100520018C (en) 2009-07-29

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KR100748671B1 (en) 2007-08-10
JP2007285286A (en) 2007-11-01
CN101059104A (en) 2007-10-24
AU2006201752A1 (en) 2007-11-01
ITMI20060839A1 (en) 2007-10-18
NL1031709C2 (en) 2009-01-20
NL1031709A1 (en) 2007-10-19
AU2006201752B2 (en) 2009-03-05

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