KR101662999B1 - Method for using LPG vehicle by gasoline fuel - Google Patents

Method for using LPG vehicle by gasoline fuel Download PDF

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Publication number
KR101662999B1
KR101662999B1 KR1020150063898A KR20150063898A KR101662999B1 KR 101662999 B1 KR101662999 B1 KR 101662999B1 KR 1020150063898 A KR1020150063898 A KR 1020150063898A KR 20150063898 A KR20150063898 A KR 20150063898A KR 101662999 B1 KR101662999 B1 KR 101662999B1
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KR
South Korea
Prior art keywords
lpg
gasoline
fuel
fuel pump
differential amplifier
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KR1020150063898A
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Korean (ko)
Inventor
성 훈 김
김창훈
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김성훈
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Priority to KR1020150063898A priority Critical patent/KR101662999B1/en
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Publication of KR101662999B1 publication Critical patent/KR101662999B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • F02B69/04—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel for gaseous and non-gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • 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
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • 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
    • F02M37/04—Feeding by means of driven pumps

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

A method of converting a liquefied petroleum gas (LPG)-operated vehicle into a gasoline-operated vehicle according to the present invention can convert the LPG-operated vehicle into the gasoline-operated vehicle by replacing only an LPG fuel pump to a gasoline turbo fuel pump without replacing an LPG injector, which minimizes a replacement cost as well as a replacement time. Since an engine can be started easily, the fuel can be supplied sufficiently at a high speed and high load area. Also, since a pressure signal value of a gasoline fuel supplied to the LPG injector is corrected by a differential amplifier and inputted to an LPG electrical control unit (ECU), a start standby time can be reduced and unnecessary lighting of a check lamp can be prevented. Furthermore, since the LPG ECU can control an engine system normally without a malfunction detection error, the engine system of an LPG-operated vehicle, which has been converted to a gasoline-operated vehicle, can operate stably and smoothly. The method of converting an LPG-operated vehicle into a gasoline-operated vehicle according to the present invention comprises: a fuel pump replacing step of replacing an LPG fuel pump among an LPG-operated vehicle engine system including the LPG fuel pump, a regulator unit, an LPG injector, and an LPG ECU, with a gasoline turbo fuel pump; and a fuel pressure detecting system replacing step of additionally installing a differential amplifier, to which a pressure sensor connected with the LPG injector is connected, and a differential value input signal generator, which is connected with the differential amplifier, in an engine system of the LPG-operated vehicle, and connecting the differential amplifier with the LPG ECU, such that an output pressure signal value from the differential amplifier is inputted to the LPG ECU.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method of using an LPG vehicle by gasoline fuel,

More particularly, the present invention relates to a gasoline vehicle automobile for an LPG vehicle, and more particularly, it is possible to replace an LPG fuel pump only with a fuel pump for a gasoline turbo, without replacing the LPG injector, In addition, it is possible to supply sufficient fuel even in a high-speed and high-load region by improving the startability. The pressure signal value of the gasoline fuel supplied to the LPG injector is corrected by the differential amplifier and input to the LPG ECU, And the LPG ECU controls the engine system normally without fault detection error, so that the engine system of the gasoline-powered vehicle can operate stably and smoothly. .

Currently, gasoline, liquefied petroleum gas (LPG), and compressed natural gas (CNG) are used as fuel for various vehicles. Although gasoline vehicles that use gasoline as vehicle fuels still occupy a large majority, the use of LPG as vehicle fuel for the purpose of reducing fuel costs is also becoming popular.

In the case of an LPG vehicle and a gasoline vehicle, the gasoline fuel may be used in an LPG vehicle as it has an almost similar apparatus structure other than the device fuel supply system or the engine system. In this connection, Korean Patent Publication No. 10-1997-0069486 "Alternative fuel supply device for LPG vehicle" discloses a device configuration for using gasoline fuel in an LPG vehicle.

And an Elpie vehicle is also used as a gasoline vehicle. To this end, it is common to replace an LPG fuel pump with a fuel pressure of 7 bar with a genuine gasoline fuel pump with a fuel pressure of 3.4 bar and replace the LPG injector with a gasoline injector. However, there is a problem that the replacement of the above-mentioned devices or parts is troublesome and the replacement cost is increased. Since the genuine gasoline fuel pump having the fuel pressure of 3.4 bar is installed in the interior of the engine system of the LPG, There is a problem that fuel shortage occurs in a high-speed and high-load region due to a low fuel pressure.

(Patent Document 1) Korean Patent Laid-Open Publication No. 10-1997-0069486 "Alternative Fuel Supply Apparatus for LPG Vehicle"

Accordingly, the present invention improves the problems of the prior art, so that the LPG injector is not replaced and the LPG is changed to a gasoline vehicle by replacing the fuel pump with the fuel pump for the gasoline turbo having the fuel pressure of 5 to 6 bar, It is an object of the present invention to provide a new type of gasoline vehicle automobile for a new type of an ELVISION vehicle, which is capable of minimizing replacement costs, minimizing replacement work time, improving startability, and providing sufficient fuel supply in a high-speed and high-

Further, according to the present invention, the gasoline fuel supply pressure signal detected by the pressure sensor connected to the LPG injector is corrected through the differential amplifier and input to the LPG ECU in a pattern similar to the LPG fuel supply pressure signal, And the normal control of the engine system without error detection of the LPG ECU can be made possible. Thus, the gasoline vehicle method of the new type of the LPG vehicle in which the engine system of the LPG vehicle can be stably and smoothly operated The purpose is to provide.

Further, according to the present invention, the canister is installed on the return line of the fuel line of the engine system of the engine without the additional evaporation gas supply line, thereby collecting the evaporated gas vaporized in the fuel pump for the gasoline turbo, And to provide a gasoline vehicle conversion method of a new type of an elastomeric vehicle in which simplification of installation work is achieved.

According to an aspect of the present invention, there is provided an LPG fuel pump, a regulator unit, an LPG injector, and an LPG ECU. The LPG fuel pump converts the LPG fuel pump into a fuel pump for a gasoline turbo A pump changing step; A differential amplifier to which a pressure sensor connected to the LPG injector is connected and a differential value input signal generator connected to the differential amplifier are additionally provided in the engine system of the LPG, and the differential amplifier is connected to the LPG ECU, And a fuel pressure detection system changing step in which the signal value is input to the LPG ECU.

In the gasoline vehicle automation method of the present invention, the differential value input signal generator may include: a microcomputer for generating a differential value input signal of a signal pattern whose size gradually decreases from a signal generation point to a setting point; And a D / A converter for converting a digital differential value input signal generated from the microcomputer into an analog differential value input signal and inputting the analog differential value input signal to a second input terminal of the differential amplifier, The difference value between the gasoline fuel supply pressure signal to the LPG injector inputted to the first input terminal of the differential amplifier and the differential value input signal inputted to the second input terminal of the differential amplifier is increased so that the differential amplifier outputs the output pressure So that the signal value can be input to the LPG ECU.

The gasoline engine fueling method of the gasoline engine of the present invention may have a fuel pressure of 5 to 6 bar.

The method for gasoline automation of an LPG vehicle according to the present invention includes a canister installation step in a return line for installing a canister on a return line of a fuel line connecting the fuel pump for gasoline turbo and the LPG injector And an evaporative gas evaporated in the fuel pump for the gasoline turbo is collected through the canister of the return line without additional evaporation gas supply line to improve the atmospheric environment, It is possible to increase the output while the gas is supplied.

According to the gasoline vehicle making method of the present invention, it is possible to minimize the replacement cost and the replacement operation time due to the change of the gasoline vehicle to the gasoline vehicle, and to improve the startability and the sufficient fuel supply in the high- There is an effect to be achieved.

Further, according to the gasoline vehicle automation method of the present invention, unlike the prior art, even if the gasoline vehicle is changed to the LPG vehicle, the startup waiting time is shortened and the unnecessary lighting of the check lamp is prevented. The system can be normally controlled. As a result, the stability of the engine system of the gasoline-powered vehicle is improved and the engine system is operated smoothly. According to the gasoline vehicle automation method of the present invention, the canister is installed in the return line of the engine system of the present invention without adding a separate evaporation gas supply line to collect the evaporated gas vaporized in the fuel pump for the gasoline turbocharger, The canister installation cost can be reduced and the installation work can be simplified.

1 is a view for showing an engine system of an ELVISION VEHICLE;
FIG. 2 is a block diagram illustrating a gasoline vehicle automation method of an LPG vehicle in accordance with an embodiment of the present invention; FIG.
3 is a view showing a vehicle engine system to which a gasoline vehicle driving method of an LPG vehicle according to an embodiment of the present invention is applied;
4 is a view showing a fuel pressure detection system of a gasoline vehicle automation method of an elastomeric vehicle according to an embodiment of the present invention;
5 (a) and 5 (b) are graphs showing signal magnitudes in a fuel pressure detection system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings 1 to 5. In the drawings and the detailed description, the term " canister " refers to a general type of vehicle, a gasoline vehicle, an LPG fuel pump, a regulator unit, an LPG injector, an LPG ECU, a pressure sensor, a fuel pump for a gasoline turbocharger, And the like are omitted or simplified in order to facilitate the understanding of the construction and operation of the present invention. In the drawings and specification, there are shown in the drawings and will not be described in detail, and only the technical features related to the present invention are shown or described only briefly. Respectively.

The method for gasoline vehicle automation of an LPG vehicle in accordance with the present invention includes an LPG fuel tank 10, an LPG fuel pump 20 ', a regulator unit 30, an LPG injector 50, an LPG ECU 60a ) For use in an engine system 100 of a gasoline vehicle using gasoline fuel as shown in FIG. For this purpose, the method of gasoline automation of an LPG vehicle according to an embodiment of the present invention may include a fuel pump changing step, a fuel pressure detecting system changing step, and a canister installing step in a return line, as shown in FIG. Here, the fuel pump changing step, the fuel pressure detecting system changing step, and the canister installing step in the return line are not sequentially performed in chronological order, but the operator may arbitrarily select a specific step You can proceed.

The fuel pump changing step is to change the LPG fuel pump to the fuel pump for the gasoline turbo among the LPG fuel pump 20 ', the regulator unit 30, the LPG injector 50, and the LPG ECU 60a . Wherein the fuel pump 20 for the gasoline turbo has a fuel pressure of 5 to 6 bar (preferably a fuel pressure of 5.4 bar). In the prior art in which the LPG fuel pump 20 'having the fuel pressure of 7 bar is replaced with the genuine gasoline fuel pump having the fuel pressure of 3.4 bar, the low fuel pressure lowers the startability and the fuel shortage occurs in the high- In the present invention, by using the fuel pump 20 for a gasoline turbo having a fuel pressure of 5 to 6 bar, it is possible to improve startability and to prevent a fuel shortage phenomenon in a high-speed and high-load region.

Here, since the engine system of the gasoline vehicle has no line corresponding to the return line of the LPG injector, the gasoline supply fuel pressure to the LPG injector 50 maintains a fixed value as shown in FIG. 5 (a). The LPG ECU 60a of the LPG engine system needs to shorten such delayed start-up waiting time as the engine is started after a waiting time of typically 7 seconds when the gasoline supply fuel pressure signal is inputted as a fixed value. Also, since the LPG fuel pressure in the LPG vehicle is about 7 bar, while the gasoline fuel pressure is lower than this, when the gasoline is supplied to the LPG injector 50 at a fuel pressure lower than 7 bar in the LPG engine system, do. In addition, when the fuel pressure is maintained at a fixed value, the LPG ECU 60a of the LPG engine system determines that the sensor is malfunctioning, so that learning and control of the air-fuel ratio are no longer performed for engine control. In order to shorten the start-up waiting time and prevent the check lamp from unnecessarily lighting up as described above, and to allow the LPG ECU 60a to normally control the engine system without detecting a failure, the gasoline vehicle- A fuel pressure detection system change step is performed.

The fuel pressure detection system changing step is a step of additionally installing the differential amplifier 70 and the differential value input signal generator 80 in the fuel pressure detection system of the engine system as shown in FIG. The differential amplifier 70 is connected to the LPG ECU 60a. So that the output pressure signal value from the differential amplifier 70 is inputted to the LPG ECU 60a. And the differential value input signal generator 80 may be included in the LPG-gasoline fuel switching ECU 60b.

Here, the differential amplifier 70 allows the pressure sensor 30a connected to the LPG injector 50 to be connected to the first input terminal and the differential value input signal generator 80 to be connected to the second input terminal.

The differential value input signal generator 80 includes a microcomputer 81 and a D / A converter 82. When the microcomputer 81 is in a key on state, The differential value input signal of the signal pattern whose size gradually decreases until the setting time is generated. The D / A converter 82 converts the digital differential value input signal generated from the microcomputer 81 into an analog differential value input signal and inputs the differential value input signal to the differential amplifier 70.

The difference value between the gasoline fuel supply pressure signal to the LPG injector 50 input to the first input terminal of the differential amplifier 70 and the differential value input signal input to the second input terminal of the differential amplifier 70 increases The differential amplifier 70 generates the output signal value of the signal pattern gradually increasing in size as shown in FIG. 5 (b) and inputs it to the LPG ECU 60a.

The canister installation step in the return line is a canister (as shown in FIG. 3) on the return line 40b of the fuel line 40 connecting the fuel pump 20 for the gasoline turbo and the LPG injector 50 90). The engine system of the gasoline vehicle is not provided with a line corresponding to the return line of the LPG vehicle, and a separate evaporation gas supply line is required to install the canister. However, in the present invention, the return line 40b The evaporative gas vaporized in the fuel pump 20 for the gasoline turbo is captured through the canister 90 to improve the atmospheric environment and the evaporative gas is supplied to the LPG injector 50 through the canister 90 during engine- Increase.

The gasoline vehicle automation method of the present invention having the above-described structure can be carried out by replacing a fuel pump to a fuel pump 20 for a gasoline turbo having a fuel pressure of 5 to 6 bar without replacing the LPG injector 50, By allowing the vehicle to be changed to a gasoline vehicle, it is possible to minimize the replacement cost and replacement time, and to improve the startability of the vehicle, thereby providing sufficient fuel supply in a high-speed, high-load region. The gasoline fuel supply pressure signal detected by the pressure sensor 30a connected to the LPG injector 50 is corrected through the differential amplifier 70 so that the LPG fuel supply pressure Signal to the LPG ECU 60a, it is possible to shorten the start-up waiting time, to prevent unnecessary lighting of the check lamp, and to normal control of the engine system without error detection failure of the LPG ECU. Thus, The engine system of the present invention has a technical feature that the engine system operates stably and smoothly.

In the gasoline vehicle driving method of the present invention, the canister 90 is installed on the return line 40b of the engine vehicle system without additional evaporation gas supply line, and the fuel pump 20 for gasoline turbo , The installation cost of the canister 90 can be reduced and the installation work can be simplified.

Although the gasoline vehicle driving method of the vehicle according to the embodiment of the present invention as described above has been described with reference to the above description and drawings, it should be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that changes and modifications may be made.

1: Engine 10: LPG fuel tank
20: Fuel pump for gasoline turbo 20 ': LPG fuel pump
30: regulator unit 30a: pressure sensor
40: fuel line 40a: supply line
40b: return line 50: LPG injector
60a: an LPG ECU 60b: an LPG-gasoline fuel conversion ECU
70: Differential amplifier 80: Differential value input signal generator
81: Micom 82: D / A converter
90: canister 100: vehicle engine system

Claims (4)

An LPG fuel pump having a fuel pressure of 7 bar among the LPG fuel tank 10, the LPG fuel pump 20 ', the regulator unit 30, the LPG injector 50, and the LPG ECU 60a 20 ') to a fuel pump (20) for a gasoline turbo having a fuel pressure of 5 to 6 bar;
The differential amplifier 70 and the differential value input signal generator 80 are additionally provided in the fuel pressure detection system of the engine system of the present invention and the differential amplifier 70 is configured such that the pressure sensor 30a connected to the LPG injector 50 is connected And a second input terminal to which the differential value input signal generator 80 is connected to the second input terminal of the differential amplifier 70 while being connected to the LPG ECU 60a and connected to the differential amplifier 70 The differential pressure input signal generator 80 included in the LPG-gasoline-fuel conversion ECU 60b outputs the output pressure signal value to the LPG ECU 60a from the signal generation point to the setting point when the key- A microcomputer 81 for generating a differential value input signal of a signal pattern whose size is reduced and a comparator 81 for converting the digital differential value input signal generated from the microcomputer 81 into an analog differential value input signal, A converter 82 for inputting the D / So that the difference value between the gasoline fuel supply pressure signal to the LPG injector 50 input to the first input terminal of the differential amplifier 70 and the differential value input signal input to the second input terminal of the differential amplifier 70 is increased , The differential amplifier (70) generates an output pressure signal value of a signal pattern of a larger size and inputs it to the LPG ECU (60a);
A canister installation step in a return line for installing a canister 90 on a return line 40b of the fuel line 40 connecting the fuel pump 20 for the gasoline turbo and the LPG injector 50 including,
The LPG injector 50 is switched to the gasoline vehicle through the replacement of the fuel pump to the fuel pump 20 for the gasoline turbo having the fuel pressure of 5 to 6 bar without replacing the LPG injector 50, 30a are corrected through the differential amplifier 70 so as to shorten the start-up waiting time, to prevent unnecessary lighting of the check lamp, and to enable normal control of the engine system without error detection of the LPG ECU. Wherein a canister (90) is provided on the return line (40b) of the engine system of the engine without the addition of the evaporation gas supply line of the gas turbine to collect the evaporated gas vaporized by the fuel pump (20) for the gasoline turbocharger How to make a gasoline vehicle. delete delete delete
KR1020150063898A 2015-05-07 2015-05-07 Method for using LPG vehicle by gasoline fuel KR101662999B1 (en)

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KR1020150063898A KR101662999B1 (en) 2015-05-07 2015-05-07 Method for using LPG vehicle by gasoline fuel

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970069486A (en) 1996-04-12 1997-11-07 김영석 Alternative fuel supply for LPG vehicles
JP2003120352A (en) * 2001-10-16 2003-04-23 Aisan Ind Co Ltd Fuel switching method and device for engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970069486A (en) 1996-04-12 1997-11-07 김영석 Alternative fuel supply for LPG vehicles
JP2003120352A (en) * 2001-10-16 2003-04-23 Aisan Ind Co Ltd Fuel switching method and device for engine

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