WO2008038977A1 - Apparatus and method for supplying lpg fuel and gasoline fuel of lpi car - Google Patents

Apparatus and method for supplying lpg fuel and gasoline fuel of lpi car Download PDF

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Publication number
WO2008038977A1
WO2008038977A1 PCT/KR2007/004673 KR2007004673W WO2008038977A1 WO 2008038977 A1 WO2008038977 A1 WO 2008038977A1 KR 2007004673 W KR2007004673 W KR 2007004673W WO 2008038977 A1 WO2008038977 A1 WO 2008038977A1
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WO
WIPO (PCT)
Prior art keywords
fuel
injector
determined
supply
amount
Prior art date
Application number
PCT/KR2007/004673
Other languages
French (fr)
Inventor
Young Ki Min
Young Soo Yang
Gyu Tak Kim
Kyeong Won Lim
Jong Hwan Chi
Hye Jin Choi
Original Assignee
Siemens Automotive Systems Co., Ltd.
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
Priority claimed from KR1020060093525A external-priority patent/KR100771824B1/en
Priority claimed from KR1020060136751A external-priority patent/KR100840126B1/en
Application filed by Siemens Automotive Systems Co., Ltd. filed Critical Siemens Automotive Systems Co., Ltd.
Publication of WO2008038977A1 publication Critical patent/WO2008038977A1/en

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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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0605—Control of components of the fuel supply system to adjust the fuel pressure or temperature
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • F02D19/061—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
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0623—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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F02D19/0676—Multi-way valves; Switch-over 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
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0694—Injectors operating with a plurality of fuels
    • 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

Definitions

  • the present invention relates to an apparatus and a method for supplying an LPI vehicle with fuel, and more particularly to an apparatus and a method for supplying an LPI vehicle with various types of fuel in a compatible manner.
  • LPG Liquefied Petroleum Gas
  • octane number As generally known in the art, LPG (Liquefied Petroleum Gas) has a high octane number and good heat resistance, and is inexpensive. Therefore, LPG is used as fuel for some types of automobiles, and its application is expected to incorporate large vehicles.
  • LPG is supplied to the engine of vehicles in a liquid state.
  • LPG easily mixes with air, and thus has excellent combustibility. Therefore, LPG causes less knocking compared with gasoline and light oil. This prevents vapor lock and percolation. As a result, LPG is gradually replacing gasoline and diesel.
  • LPG fuel supply apparatuses supply injectors with liquid LPG fuel via fuel pumps and fuel supply lines.
  • the injectors inject LPG fuel into cylinders.
  • the injected fuel mixes with air, vaporizes, and drives the engine. When the engine is turned off, the remaining fuel returns to the fuel tank via fuel return lines.
  • an LPI vehicle which is compatible with both LPG and gasoline, has injectors and fuel supply lines dedicated to each fuel type.
  • injectors and fuel supply lines dedicated to each fuel type.
  • each fuel type requires separate fuel supply lines and injectors makes the manufacturing process complicated and increases the manufacturing cost. Disclosure of Invention Technical Problem
  • the present invention has been made in view of the above-mentioned problems, and the present invention provides an apparatus and a method for supplying an LPI vehicle with fuel, wherein a three-way fuel supply valve for switching to a type of fuel selected by the user and supplying the selected type of fuel to an injector compatible with a number of fuel types is installed together with a fuel interruption valve having return and returnless control modes so that a number of conventional injectors and fuel supply lines are replaced with a single injector and a single fuel supply line compatible with a number of fuel types, thereby simplifying the manufacturing process and reducing the manufacturing cost.
  • an apparatus for supplying an LPI vehicle with fuel including a fuel supply line for transmitting fuel from one of a first fuel tank filled with first fuel and a second fuel tank filled with second fuel to an injector; a pressure regulator for maintaining a constant fuel pressure difference between the fuel supply line and a fuel return line; a three-way fuel supply valve positioned between the pressure regulator and the injector to supply the injector with one of the first fuel in the first fuel tank and the second fuel in the second fuel tank; and a fuel interruption valve positioned between the pressure regulator and the second fuel tank and adapted to be controllably opened and closed based on a fuel type so that a redundant amount of the second fuel returns to the second fuel tank.
  • the first fuel is gasoline fuel
  • the second fuel is one of LPG fuel and compressed natural gas.
  • the fuel interruption valve is controllably opened when the second fuel is used and controllably closed when the first fuel is used.
  • a method for supplying an LPI vehicle with fuel including a three-way fuel supply valve installed in a fuel supply line for supplying one of first fuel and second fuel to an injector and a fuel interruption valve for returning the second fuel to a second fuel tank, the method including the steps of a) creating a fuel injection signal corresponding to fuel previously supplied to the injector; b) executing a second fuel supply mode by determining if a fuel switch request signal has been received from a user, determining if a switch to the first fuel is requested when it has been determined that the fuel switch request signal has been received, determining if supply of the first fuel has been cut if it has been determined that a switch to the first fuel has been requested, controllably opening the fuel interruption valve if it has been determined that supply of the first fuel has not been cut, and supplying the injector with the second fuel; and c) executing a first fuel supply mode by determining if supply of the second fuel has been cut
  • Step a) further includes a step of determining if a first fuel supply apparatus is malfunctioning if no fuel switch request signal has been received, proceeding to step b) if the first fuel supply apparatus is malfunctioning, and executing the second fuel supply mode.
  • Step a) further includes a step of determining if an amount of the first fuel is below a predetermined first threshold when it has been determined that the first fuel supply apparatus is not malfunctioning, proceeding to step b) when the amount of the first fuel is below the first threshold, and executing the second fuel supply mode.
  • Step a) further includes a step of determining if a second fuel supply apparatus is malfunctioning when the amount of the first fuel is not below the first threshold, proceeding to step c) when it has been determined that the second fuel supply apparatus is malfunctioning, and executing the first fuel supply mode.
  • Step a) further includes a step of sensing a cooling water temperature when it has been determined that the second fuel supply apparatus is not malfunctioning, comparing the sensed cooling water temperature with a predetermined second threshold, proceeding to step c) when it is confirmed as a result of comparison that the cooling water temperature is below the second threshold, and executing the first fuel supply mode.
  • Step a) further includes a step of sensing an amount of the second fuel when it has been determined as a result of comparison that the sensed cooling water temperature is not below the second threshold, comparing the sensed amount of the second fuel with a predetermined third threshold, proceeding to step c) when the amount of the second fuel is below the third threshold, and executing the first fuel supply mode.
  • the second fuel supply mode in step b) includes the steps of b-1) creating a second fuel injection signal corresponding to the second fuel; b-2) controllably opening the fuel interruption valve, counting a cylinder number, correcting the second fuel injection signal in step b-1) for each cylinder; and b-3) determining if cylinder counting in step b-2) has been completed and transmitting the second fuel injection signal corrected in step b-2) to the injector when it has been determined that cylinder counting has been completed.
  • the first fuel supply mode in step c) includes the steps of c-1) creating a first fuel injection signal corresponding to the first fuel; c-2) controllably closing the fuel interruption valve, counting a cylinder number, and correcting the first fuel injection signal in step c-1) for each cylinder; and c-3) determining if cylinder counting in step c-2) has been completed, determining if first fuel injection is initial fuel injection when it has been determined that cylinder counting has been completed, and transmitting the first fuel injection signal corrected in step c-2) to the injector when it has been determined that the first fuel injection is initial fuel injection.
  • the method further includes a step of c-4) transmitting an existing first fuel injection signal to the injector when it has been determined in step c-3) that the first fuel injection is not initial fuel injection.
  • the first fuel injection signal corrected in step c-2) indicates a predetermined amount of additional injection added to an existing amount of first fuel injection.
  • the predetermined amount of additional injection corresponds to an amount of the first fuel adhering to a wall surface of an intake manifold during initial injection of the first fuel.
  • the amount of the first fuel adhering to the wall surface of the intake manifold is calculated by interpolation based on running time using the second fuel before fuel switching.
  • the apparatus and method for supplying an LPI vehicle with fuel according to the present invention is advantageous in that, by providing the fuel supply line with a three-way fuel supply valve for supplying the injector with one of first fuel and second fuel and with a fuel interruption valve for returning a redundant amount of second fuel in the injector to the second fuel tank, a number of conventional injectors and fuel supply lines are replaced with a single injector and a single fuel supply line compatible with a number of fuel types, thereby simplifying the manufacturing process and reducing the manufacturing cost.
  • FIG. 1 shows the construction of an apparatus for supplying an LPI vehicle with fuel according to the prior art
  • FIG. 2 shows the construction of an apparatus for supplying an LPI vehicle with fuel according to the present invention
  • FIG. 3 is a flowchart showing processes for supplying an LPI vehicle with fuel.
  • FIG. 2 shows the construction of an apparatus for supplying an LPI vehicle with fuel according to the present invention
  • FIG. 3 is a flowchart showing processes for controlling the fuel supply apparatus by a sub-ECU shown in FIG. 2.
  • the fuel supply apparatus according to the present invention includes a gasoline fuel tank 11, an LPG fuel tank 13, an injector 17, a gasoline fuel supply line 21, an LPG fuel supply line 23, a fuel supply valve 25, a fuel return line 27, a fuel pressure regulator 29, a fuel interruption valve 31, and an ECU 33.
  • the fuel supply valve 25 is adapted to provide the injector 17 with one of gasoline fuel and LPG fuel, which are supplied via the gasoline fuel supply line 21 and the LPG fuel supply line 23, respectively, under the control of the ECU 33.
  • the fuel supply valve 25 is positioned between the fuel pressure regulator 29 and the injector 17.
  • the fuel supply valve 25 according to an embodiment of the present invention adopts a three-way scheme, i.e. it selects from first and second types of fuel and supplies it to the injector 17, the fuel supply valve 25 may be adapted to select from a larger number of types of fuel and supply it.
  • the injector 17 is adapted to inject gasoline or LPG fuel, which is supplied by the fuel supply valve 25, into the cylinder according to a fuel injection signal from the ECU 33.
  • the fuel interruption valve 31 is positioned between the fuel pressure regulator 29 and the LPG fuel tank 13. When the fuel interruption valve 31 is opened under the control of the ECU 33, a redundant amount of LPG fuel outputted from the injector 17 returns to the LPG fuel tank 13 via the fuel return line 27. When the fuel interruption valve 31 is closed under the control of the ECU 33, the redundant amount of fuel from the injector 17 does not return to the gasoline fuel tank 11.
  • the apparatus for supplying an LPI vehicle with fuel according to the present invention which is constructed as mentioned above, is operated in the following manner: the ECU 33 creates a fuel injection signal corresponding to previously employed fuel and transmits the signal to the injector 17 (step 101). The ECU 33 then determines if a fuel switch request signal has been received (step 103).
  • step 105 the ECU 33 decides if the signal requests a switch to gasoline fuel (step 105). If a switch to gasoline fuel has been requested, the ECU determines if the supply of gasoline fuel has been cut (step 107). If the supply of gasoline fuel has not been cut, the ECU 33 creates a gas fuel injection signal (step 109), and controls and closes the fuel interruption valve 31 (step 111).
  • the gas fuel is managed in a return system, i.e. the redundant amount of fuel from the injector 17 returns to the LPG fuel tank 13.
  • the fuel pressure regulator 29 maintains a fuel pressure difference between the fuel supply line 21 and the fuel return line 27 at 5bar.
  • the ECU 33 counts the number of cylinders of the injector 17 (step 113), and corrects the gas fuel injection signal created in step 109 for each counted cylinder (step 115).
  • the ECU 33 determines if the counting in step 113 has ended (step 117). If it is determined that the cylinder counting has ended, the ECU 33 outputs the gas fuel injection signal corrected in step 115 (step 119), and transmits the outputted gas fuel injection signal to the injector 17 (step 120).
  • the LPG fuel which has been supplied to the injector 17 via the LPG fuel supply line 23 and the fuel supply valve 25, is injected into the cylinders of the injector 17 according to the gas fuel injection signal.
  • step 105 If it is determined in step 105 that the signal has not requested a switch to gasoline fuel, the ECU 33 confirms that a switch to LPG fuel has been requested, and determines if the supply of LPG fuel has been cut. If the supply of LPG fuel has not bee cut, the ECU 33 creates a gasoline fuel injection signal (step 123). The ECU 33 then controls and closes the fuel interruption valve 31 (step 125).
  • the gasoline fuel is managed in a returnless system, and the fuel pressure regulator 29 maintains a fuel pressure difference between the gasoline fuel supply line 21 and the fuel return line 27 at 3bar.
  • the ECU 33 counts the number of cylinders of the injector 17 (step 127), and corrects the gasoline fuel injection signal created in step 123 for each counted cylinder (step 129).
  • the ECU 33 determines if the counting in step 127 has ended (step 131). If it is determined that the cylinder counting has ended, the ECU 33 decides if the gasoline fuel is to be injected for the first time (step 132). If so, the ECU outputs the gasoline fuel injection signal corrected in step 129 (step 133), and transmits the gasoline fuel injection signal to the injector 17 (step 135).
  • the amount of fuel injection based on the gasoline fuel injection signal corrected in step 129 is determined in such a manner that, after switching from LPG to gasoline, the amount of initially injected gasoline is increased as much a predetermined amount, which corresponds to the amount of gasoline adhering to the wall surface of the intake manifold during the initial gasoline injection, and which is calculated by interpolation based on consideration of how long the vehicle has been running and using LPG before the fuel switch.
  • the LPG fuel which has been supplied to the injector 17 via the gasoline fuel supply line 21 and the fuel supply valve 25, is injected into the cylinders of the injector 17 according to the gasoline fuel injection signal.
  • step 132 If it is determined in step 132 that the gasoline fuel is not initially injected, a predetermined gasoline fuel injection signal is outputted (step 135).
  • step 137 the ECU 33 checks if the gasoline fuel supply apparatus is malfunctioning. If it is determined that the gasoline fuel supply apparatus is not malfunctioning, the ECU 33 determines if the amount of fuel in the gasoline fuel tank 11 is below a predetermined first threshold (step 141).
  • step 137 If the gasoline fuel supply apparatus is confirmed to be malfunctioning in step 137, or if the amount of fuel is confirmed to be below the first threshold in step 141, the ECU 33 proceeds to step 107 and enters into an LPG fuel supply mode.
  • step 137 if it is confirmed in step 137 that the gasoline fuel supply apparatus is not malfunctioning and if it is confirmed in step 141 that the amount of gasoline fuel is not below the first threshold, the ECU 33 checks if the LPG fuel supply apparatus is malfunctioning (step 141). Then, the ECU 33 determines if the cooling water temperature is below a predetermined second threshold (step 143), and determines if the amount of LPG fuel is below a predetermined third threshold (step 145).
  • step 141 If it is determined in step 141 that the LPG fuel supply apparatus is malfunctioning, if it is determined in step 143 that the cooling water temperature is below the second threshold, or if it is confirmed in step 145 that the amount of LPG fuel is below the third threshold, the ECU 33 proceeds to step 123 and enters into a gasoline fuel supply mode.
  • step 141 determines whether the LPG fuel supply apparatus is not malfunctioning. If it is determined in step 143 that the cooling water temperature is not below the second threshold, and if it is determined in step 145 that the amount of LPG fuel is not below the third threshold, the ECU 33 proceeds to step 101.
  • step 147) and, if so, ends the program.
  • the present invention is advantageous in that, by installing a three-way fuel supply valve for switching to a type of fuel selected by the user and supplying the selected type of fuel to an injector compatible with a number of fuel types, as well as a fuel interruption valve having return and returnless control modes, a number of conventional injectors and fuel supply lines are replaced with a single injector and a single fuel supply line compatible with a number of fuel types, thereby simplifying the manufacturing process and reducing the manufacturing cost.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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  • Biomedical Technology (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

Disclosed is an apparatus and a method for supplying an LPI vehicle with fuel by using a single injector and a single fuel supply line. The fuel supply line is provided with a three-way fuel supply valve for supplying the injector with one of gasoline fuel and LPG fuel, as well as with a fuel interruption valve for returning a redundant amount of second fuel in the injector to the second fuel tank. As a result, a number of conventional injectors and fuel supply lines are replaced with a single injector and a single fuel supply line compatible with LPG fuel and gasoline fuel. This simplifies the manufacturing process and reduces the manufacturing cost.

Description

Description
APPARUS AND METHOD FOR SUPPLYING LPG FUEL AND
GASOLINE FUEL OF LPI CAR
Technical Field
[1] The present invention relates to an apparatus and a method for supplying an LPI vehicle with fuel, and more particularly to an apparatus and a method for supplying an LPI vehicle with various types of fuel in a compatible manner. Background Art
[2] As generally known in the art, LPG (Liquefied Petroleum Gas) has a high octane number and good heat resistance, and is inexpensive. Therefore, LPG is used as fuel for some types of automobiles, and its application is expected to incorporate large vehicles.
[3] LPG is supplied to the engine of vehicles in a liquid state. When vaporized, LPG easily mixes with air, and thus has excellent combustibility. Therefore, LPG causes less knocking compared with gasoline and light oil. This prevents vapor lock and percolation. As a result, LPG is gradually replacing gasoline and diesel.
[4] LPG fuel supply apparatuses supply injectors with liquid LPG fuel via fuel pumps and fuel supply lines. The injectors inject LPG fuel into cylinders. The injected fuel mixes with air, vaporizes, and drives the engine. When the engine is turned off, the remaining fuel returns to the fuel tank via fuel return lines.
[5] Referring to FIG. 1, an LPI vehicle, which is compatible with both LPG and gasoline, has injectors and fuel supply lines dedicated to each fuel type. The fact that each fuel type requires separate fuel supply lines and injectors makes the manufacturing process complicated and increases the manufacturing cost. Disclosure of Invention Technical Problem
[6] Therefore, the present invention has been made in view of the above-mentioned problems, and the present invention provides an apparatus and a method for supplying an LPI vehicle with fuel, wherein a three-way fuel supply valve for switching to a type of fuel selected by the user and supplying the selected type of fuel to an injector compatible with a number of fuel types is installed together with a fuel interruption valve having return and returnless control modes so that a number of conventional injectors and fuel supply lines are replaced with a single injector and a single fuel supply line compatible with a number of fuel types, thereby simplifying the manufacturing process and reducing the manufacturing cost. Technical Solution [7] In accordance with an aspect of the present invention, there is provided an apparatus for supplying an LPI vehicle with fuel, the apparatus including a fuel supply line for transmitting fuel from one of a first fuel tank filled with first fuel and a second fuel tank filled with second fuel to an injector; a pressure regulator for maintaining a constant fuel pressure difference between the fuel supply line and a fuel return line; a three-way fuel supply valve positioned between the pressure regulator and the injector to supply the injector with one of the first fuel in the first fuel tank and the second fuel in the second fuel tank; and a fuel interruption valve positioned between the pressure regulator and the second fuel tank and adapted to be controllably opened and closed based on a fuel type so that a redundant amount of the second fuel returns to the second fuel tank.
[8] The first fuel is gasoline fuel, and the second fuel is one of LPG fuel and compressed natural gas. The fuel interruption valve is controllably opened when the second fuel is used and controllably closed when the first fuel is used.
[9] According to another aspect of the present invention, there is provided a method for supplying an LPI vehicle with fuel, the LPI vehicle including a three-way fuel supply valve installed in a fuel supply line for supplying one of first fuel and second fuel to an injector and a fuel interruption valve for returning the second fuel to a second fuel tank, the method including the steps of a) creating a fuel injection signal corresponding to fuel previously supplied to the injector; b) executing a second fuel supply mode by determining if a fuel switch request signal has been received from a user, determining if a switch to the first fuel is requested when it has been determined that the fuel switch request signal has been received, determining if supply of the first fuel has been cut if it has been determined that a switch to the first fuel has been requested, controllably opening the fuel interruption valve if it has been determined that supply of the first fuel has not been cut, and supplying the injector with the second fuel; and c) executing a first fuel supply mode by determining if supply of the second fuel has been cut if it has been determined in step b) that no switch to the first fuel has been requested, controllably closing the fuel interruption valve if it has been determined that supply of the second fuel has not been cut, and supplying the injector with the first fuel. The first fuel is gasoline fuel, and the second fuel is LPG fuel.
[10] Step a) further includes a step of determining if a first fuel supply apparatus is malfunctioning if no fuel switch request signal has been received, proceeding to step b) if the first fuel supply apparatus is malfunctioning, and executing the second fuel supply mode.
[11] Step a) further includes a step of determining if an amount of the first fuel is below a predetermined first threshold when it has been determined that the first fuel supply apparatus is not malfunctioning, proceeding to step b) when the amount of the first fuel is below the first threshold, and executing the second fuel supply mode.
[12] Step a) further includes a step of determining if a second fuel supply apparatus is malfunctioning when the amount of the first fuel is not below the first threshold, proceeding to step c) when it has been determined that the second fuel supply apparatus is malfunctioning, and executing the first fuel supply mode.
[13] Step a) further includes a step of sensing a cooling water temperature when it has been determined that the second fuel supply apparatus is not malfunctioning, comparing the sensed cooling water temperature with a predetermined second threshold, proceeding to step c) when it is confirmed as a result of comparison that the cooling water temperature is below the second threshold, and executing the first fuel supply mode.
[14] Step a) further includes a step of sensing an amount of the second fuel when it has been determined as a result of comparison that the sensed cooling water temperature is not below the second threshold, comparing the sensed amount of the second fuel with a predetermined third threshold, proceeding to step c) when the amount of the second fuel is below the third threshold, and executing the first fuel supply mode.
[15] The second fuel supply mode in step b) includes the steps of b-1) creating a second fuel injection signal corresponding to the second fuel; b-2) controllably opening the fuel interruption valve, counting a cylinder number, correcting the second fuel injection signal in step b-1) for each cylinder; and b-3) determining if cylinder counting in step b-2) has been completed and transmitting the second fuel injection signal corrected in step b-2) to the injector when it has been determined that cylinder counting has been completed.
[16] The first fuel supply mode in step c) includes the steps of c-1) creating a first fuel injection signal corresponding to the first fuel; c-2) controllably closing the fuel interruption valve, counting a cylinder number, and correcting the first fuel injection signal in step c-1) for each cylinder; and c-3) determining if cylinder counting in step c-2) has been completed, determining if first fuel injection is initial fuel injection when it has been determined that cylinder counting has been completed, and transmitting the first fuel injection signal corrected in step c-2) to the injector when it has been determined that the first fuel injection is initial fuel injection.
[17] The method further includes a step of c-4) transmitting an existing first fuel injection signal to the injector when it has been determined in step c-3) that the first fuel injection is not initial fuel injection.
[18] The first fuel injection signal corrected in step c-2) indicates a predetermined amount of additional injection added to an existing amount of first fuel injection. The predetermined amount of additional injection corresponds to an amount of the first fuel adhering to a wall surface of an intake manifold during initial injection of the first fuel. The amount of the first fuel adhering to the wall surface of the intake manifold is calculated by interpolation based on running time using the second fuel before fuel switching.
Advantageous Effects
[19] The apparatus and method for supplying an LPI vehicle with fuel according to the present invention is advantageous in that, by providing the fuel supply line with a three-way fuel supply valve for supplying the injector with one of first fuel and second fuel and with a fuel interruption valve for returning a redundant amount of second fuel in the injector to the second fuel tank, a number of conventional injectors and fuel supply lines are replaced with a single injector and a single fuel supply line compatible with a number of fuel types, thereby simplifying the manufacturing process and reducing the manufacturing cost. Brief Description of the Drawings
[20] The foregoing and other objects, features, and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:
[21] FIG. 1 shows the construction of an apparatus for supplying an LPI vehicle with fuel according to the prior art;
[22] FIG. 2 shows the construction of an apparatus for supplying an LPI vehicle with fuel according to the present invention; and
[23] FIG. 3 is a flowchart showing processes for supplying an LPI vehicle with fuel.
Mode for the Invention
[24] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. It will be assumed in the following description that the vehicle is equipped with an LPI system compatible with gasoline and LPG.
[25] FIG. 2 shows the construction of an apparatus for supplying an LPI vehicle with fuel according to the present invention, and FIG. 3 is a flowchart showing processes for controlling the fuel supply apparatus by a sub-ECU shown in FIG. 2. Referring to FIGs. 2 and 3, the fuel supply apparatus according to the present invention includes a gasoline fuel tank 11, an LPG fuel tank 13, an injector 17, a gasoline fuel supply line 21, an LPG fuel supply line 23, a fuel supply valve 25, a fuel return line 27, a fuel pressure regulator 29, a fuel interruption valve 31, and an ECU 33.
[26] The fuel supply valve 25 is adapted to provide the injector 17 with one of gasoline fuel and LPG fuel, which are supplied via the gasoline fuel supply line 21 and the LPG fuel supply line 23, respectively, under the control of the ECU 33. The fuel supply valve 25 is positioned between the fuel pressure regulator 29 and the injector 17. Although the fuel supply valve 25 according to an embodiment of the present invention adopts a three-way scheme, i.e. it selects from first and second types of fuel and supplies it to the injector 17, the fuel supply valve 25 may be adapted to select from a larger number of types of fuel and supply it.
[27] The injector 17 is adapted to inject gasoline or LPG fuel, which is supplied by the fuel supply valve 25, into the cylinder according to a fuel injection signal from the ECU 33.
[28] The fuel interruption valve 31 is positioned between the fuel pressure regulator 29 and the LPG fuel tank 13. When the fuel interruption valve 31 is opened under the control of the ECU 33, a redundant amount of LPG fuel outputted from the injector 17 returns to the LPG fuel tank 13 via the fuel return line 27. When the fuel interruption valve 31 is closed under the control of the ECU 33, the redundant amount of fuel from the injector 17 does not return to the gasoline fuel tank 11.
[29] The apparatus for supplying an LPI vehicle with fuel according to the present invention, which is constructed as mentioned above, is operated in the following manner: the ECU 33 creates a fuel injection signal corresponding to previously employed fuel and transmits the signal to the injector 17 (step 101). The ECU 33 then determines if a fuel switch request signal has been received (step 103).
[30] If it is determined that a fuel switch request signal has been received in step 103, the ECU 33 decides if the signal requests a switch to gasoline fuel (step 105). If a switch to gasoline fuel has been requested, the ECU determines if the supply of gasoline fuel has been cut (step 107). If the supply of gasoline fuel has not been cut, the ECU 33 creates a gas fuel injection signal (step 109), and controls and closes the fuel interruption valve 31 (step 111).
[31] As a result, the gas fuel is managed in a return system, i.e. the redundant amount of fuel from the injector 17 returns to the LPG fuel tank 13. The fuel pressure regulator 29 maintains a fuel pressure difference between the fuel supply line 21 and the fuel return line 27 at 5bar.
[32] The ECU 33 counts the number of cylinders of the injector 17 (step 113), and corrects the gas fuel injection signal created in step 109 for each counted cylinder (step 115). The ECU 33 determines if the counting in step 113 has ended (step 117). If it is determined that the cylinder counting has ended, the ECU 33 outputs the gas fuel injection signal corrected in step 115 (step 119), and transmits the outputted gas fuel injection signal to the injector 17 (step 120). As a result, the LPG fuel, which has been supplied to the injector 17 via the LPG fuel supply line 23 and the fuel supply valve 25, is injected into the cylinders of the injector 17 according to the gas fuel injection signal.
[33] If it is determined in step 105 that the signal has not requested a switch to gasoline fuel, the ECU 33 confirms that a switch to LPG fuel has been requested, and determines if the supply of LPG fuel has been cut. If the supply of LPG fuel has not bee cut, the ECU 33 creates a gasoline fuel injection signal (step 123). The ECU 33 then controls and closes the fuel interruption valve 31 (step 125).
[34] As a result, the gasoline fuel is managed in a returnless system, and the fuel pressure regulator 29 maintains a fuel pressure difference between the gasoline fuel supply line 21 and the fuel return line 27 at 3bar.
[35] The ECU 33 counts the number of cylinders of the injector 17 (step 127), and corrects the gasoline fuel injection signal created in step 123 for each counted cylinder (step 129). The ECU 33 determines if the counting in step 127 has ended (step 131). If it is determined that the cylinder counting has ended, the ECU 33 decides if the gasoline fuel is to be injected for the first time (step 132). If so, the ECU outputs the gasoline fuel injection signal corrected in step 129 (step 133), and transmits the gasoline fuel injection signal to the injector 17 (step 135).
[36] The amount of fuel injection based on the gasoline fuel injection signal corrected in step 129 is determined in such a manner that, after switching from LPG to gasoline, the amount of initially injected gasoline is increased as much a predetermined amount, which corresponds to the amount of gasoline adhering to the wall surface of the intake manifold during the initial gasoline injection, and which is calculated by interpolation based on consideration of how long the vehicle has been running and using LPG before the fuel switch.
[37] Then, the LPG fuel, which has been supplied to the injector 17 via the gasoline fuel supply line 21 and the fuel supply valve 25, is injected into the cylinders of the injector 17 according to the gasoline fuel injection signal.
[38] If it is determined in step 132 that the gasoline fuel is not initially injected, a predetermined gasoline fuel injection signal is outputted (step 135).
[39] Meanwhile, if it is determined in step 103 that no fuel switch request signal has been received, the ECU 33 checks if the gasoline fuel supply apparatus is malfunctioning (step 137). If it is determined that the gasoline fuel supply apparatus is not malfunctioning, the ECU 33 determines if the amount of fuel in the gasoline fuel tank 11 is below a predetermined first threshold (step 141).
[40] If the gasoline fuel supply apparatus is confirmed to be malfunctioning in step 137, or if the amount of fuel is confirmed to be below the first threshold in step 141, the ECU 33 proceeds to step 107 and enters into an LPG fuel supply mode.
[41] On the other hand, if it is confirmed in step 137 that the gasoline fuel supply apparatus is not malfunctioning and if it is confirmed in step 141 that the amount of gasoline fuel is not below the first threshold, the ECU 33 checks if the LPG fuel supply apparatus is malfunctioning (step 141). Then, the ECU 33 determines if the cooling water temperature is below a predetermined second threshold (step 143), and determines if the amount of LPG fuel is below a predetermined third threshold (step 145).
[42] If it is determined in step 141 that the LPG fuel supply apparatus is malfunctioning, if it is determined in step 143 that the cooling water temperature is below the second threshold, or if it is confirmed in step 145 that the amount of LPG fuel is below the third threshold, the ECU 33 proceeds to step 123 and enters into a gasoline fuel supply mode.
[43] On the other hand, if it is determined in step 141 that the LPG fuel supply apparatus is not malfunctioning, if it is determined in step 143 that the cooling water temperature is not below the second threshold, and if it is determined in step 145 that the amount of LPG fuel is not below the third threshold, the ECU 33 proceeds to step 101.
[44] After steps 120 and 135, the ECU 33 determines if the engine has been turned off
(step 147) and, if so, ends the program.
[45] Those skilled in the art can understand that, although gasoline and LPG have been assumed as the first and second types of fuel in the description of an embodiment of the present invention, the fuel type is not limited to that, and the second type of fuel may be compressed natural gas, for example. In addition, it is also possible to select from more than two types of fuel and supply it to a single injector. Industrial Applicability
[46] As mentioned above, the present invention is advantageous in that, by installing a three-way fuel supply valve for switching to a type of fuel selected by the user and supplying the selected type of fuel to an injector compatible with a number of fuel types, as well as a fuel interruption valve having return and returnless control modes, a number of conventional injectors and fuel supply lines are replaced with a single injector and a single fuel supply line compatible with a number of fuel types, thereby simplifying the manufacturing process and reducing the manufacturing cost.
[47]
[48]

Claims

Claims
[1] An apparatus for supplying an LPI vehicle with fuel, the apparatus comprising: a fuel supply line for transmitting fuel from one of a first fuel tank filled with first fuel and a second fuel tank filled with second fuel to an injector; a pressure regulator for maintaining a constant fuel pressure difference between the fuel supply line and a fuel return line; a three-way fuel supply valve positioned between the pressure regulator and the injector to supply the injector with one of the first fuel in the first fuel tank and the second fuel in the second fuel tank; and a fuel interruption valve positioned between the pressure regulator and the second fuel tank and adapted to be controllably opened and closed based on a fuel type so that a redundant amount of the second fuel returns to the second fuel tank.
[2] The apparatus as claimed in claim 1, wherein the first fuel is gasoline fuel, and the second fuel is one of LPG fuel and compressed natural gas.
[3] The apparatus as claimed in claim 2, wherein the fuel interruption valve is controllably opened when the second fuel is used and controllably closed when the first fuel is used.
[4] A method for supplying an LPI vehicle with fuel, the LPI vehicle comprising a three-way fuel supply valve installed in a fuel supply line for supplying one of first fuel and second fuel to an injector and a fuel interruption valve for returning the second fuel to a second fuel tank, the method comprising the steps of: a) creating a fuel injection signal corresponding to fuel previously supplied to the injector; b) executing a second fuel supply mode by determining if a fuel switch request signal has been received from a user, determining if a switch to the first fuel is requested when it has been determined that the fuel switch request signal has been received, determining if supply of the first fuel has been cut if it has been determined that a switch to the first fuel has been requested, controllably opening the fuel interruption valve if it has been determined that supply of the first fuel has not been cut, and supplying the injector with the second fuel; and c) executing a first fuel supply mode by determining if supply of the second fuel has been cut if it has been determined in step b) that no switch to the first fuel has been requested, controllably closing the fuel interruption valve if it has been determined that supply of the second fuel has not been cut, and supplying the injector with the first fuel.
[5] The method as claimed in claim 4, wherein the first fuel is gasoline fuel, and the second fuel is one of LPG fuel and compressed natural gas.
[6] The method as claimed in claim 5, wherein step a) further comprises a step of determining if a first fuel supply apparatus is malfunctioning if no fuel switch request signal has been received, proceeding to step b) if the first fuel supply apparatus is malfunctioning, and executing the second fuel supply mode.
[7] The method as claimed in claim 6, wherein step a) further comprises a step of determining if an amount of the first fuel is below a predetermined first threshold when it has been determined that the first fuel supply apparatus is not malfunctioning, proceeding to step b) when the amount of the first fuel is below the first threshold, and executing the second fuel supply mode.
[8] The method as claimed in claim 7, wherein step a) further comprises a step of determining if a second fuel supply apparatus is malfunctioning when the amount of the first fuel is not below the first threshold, proceeding to step c) when it has been determined that the second fuel supply apparatus is malfunctioning, and executing the first fuel supply mode.
[9] The method as claimed in claim 8, wherein step a) further comprises a step of sensing a cooling water temperature when it has been determined that the second fuel supply apparatus is not malfunctioning, comparing the sensed cooling water temperature with a predetermined second threshold, proceeding to step c) when it is confirmed as a result of comparison that the cooling water temperature is below the second threshold, and executing the first fuel supply mode.
[10] The method as claimed in claim 9, wherein step a) further comprises a step of sensing an amount of the second fuel when it has been determined as a result of comparison that the sensed cooling water temperature is not below the second threshold, comparing the sensed amount of the second fuel with a predetermined third threshold, proceeding to step c) when the amount of the second fuel is below the third threshold, and executing the first fuel supply mode.
[11] The method as claimed in one of claims 4-10, wherein the second fuel supply mode in step b) comprises the steps of: b-1) creating a second fuel injection signal corresponding to the second fuel; b-2) controllably opening the fuel interruption valve, counting a cylinder number, correcting the second fuel injection signal in step b-1) for each cylinder; and b-3) determining if cylinder counting in step b-2) has been completed and transmitting the second fuel injection signal corrected in step b-2) to the injector when it has been determined that cylinder counting has been completed.
[12] The method as claimed in claim 11, wherein the first fuel supply mode in step c) comprises the steps of: c-1) creating a first fuel injection signal corresponding to the first fuel; c-2) controllably closing the fuel interruption valve, counting a cylinder number, and correcting the first fuel injection signal in step c-1) for each cylinder; and c-3) determining if cylinder counting in step c-2) has been completed, determining if first fuel injection is initial fuel injection when it has been determined that cylinder counting has been completed, and transmitting the first fuel injection signal corrected in step c-2) to the injector when it has been determined that the first fuel injection is initial fuel injection.
[13] The method as claimed in claim 12, further comprising a step of c-4) transmitting an existing first fuel injection signal to the injector when it has been determined in step c-3) that the first fuel injection is not initial fuel injection.
[14] The method as claimed in claim 12, wherein the first fuel injection signal corrected in step c-2) indicates a predetermined amount of additional injection added to an existing amount of first fuel injection.
[15] The method as claimed in claim 14, wherein the predetermined amount of additional injection corresponds to an amount of the first fuel adhering to a wall surface of an intake manifold during initial injection of the first fuel.
[16] The method as claimed in claim 15, wherein the amount of the first fuel adhering to the wall surface of the intake manifold is calculated by interpolation based on running time using the second fuel before fuel switching.
PCT/KR2007/004673 2006-09-26 2007-09-21 Apparatus and method for supplying lpg fuel and gasoline fuel of lpi car WO2008038977A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020060093525A KR100771824B1 (en) 2006-09-26 2006-09-26 Apparatus for supplying lpg fuel and gasoline fuel of lpi car
KR10-2006-0093525 2006-09-26
KR1020060136751A KR100840126B1 (en) 2006-12-28 2006-12-28 Method for controlling fuel injection of bi-fuel car
KR10-2006-0136751 2006-12-28

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WO2008038977A1 true WO2008038977A1 (en) 2008-04-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050070820A (en) * 2003-12-31 2005-07-07 현대자동차주식회사 Lpi system
JP2005248941A (en) * 2004-03-04 2005-09-15 Hyundai Motor Co Ltd Fuel pump noise reducing device for lpi vehicle
JP2005248942A (en) * 2004-03-04 2005-09-15 Hyundai Motor Co Ltd Fuel pump noise reducing device and method for lpi vehicle
KR20060031212A (en) * 2004-10-08 2006-04-12 현대자동차주식회사 Fuel system of the lpi engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050070820A (en) * 2003-12-31 2005-07-07 현대자동차주식회사 Lpi system
JP2005248941A (en) * 2004-03-04 2005-09-15 Hyundai Motor Co Ltd Fuel pump noise reducing device for lpi vehicle
JP2005248942A (en) * 2004-03-04 2005-09-15 Hyundai Motor Co Ltd Fuel pump noise reducing device and method for lpi vehicle
KR20060031212A (en) * 2004-10-08 2006-04-12 현대자동차주식회사 Fuel system of the lpi engine

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