KR20100029893A - Fuel supplying device for liquefied natural gas vehicle - Google Patents

Fuel supplying device for liquefied natural gas vehicle Download PDF

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KR20100029893A
KR20100029893A KR1020080088588A KR20080088588A KR20100029893A KR 20100029893 A KR20100029893 A KR 20100029893A KR 1020080088588 A KR1020080088588 A KR 1020080088588A KR 20080088588 A KR20080088588 A KR 20080088588A KR 20100029893 A KR20100029893 A KR 20100029893A
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South Korea
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fuel
pressure
control unit
heat exchanger
engine control
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KR1020080088588A
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Korean (ko)
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KR101405582B1 (en
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정태영
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현대자동차주식회사
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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
    • 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
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/247—Pressure sensors
    • 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

Abstract

PURPOSE: A fuel delivery system of a liquefied natural gas vehicle is provided to smoothly supply fuel of certain pressure by carrying fuel by a fuel pump to a mixer and a fuel tank when the fuel supply pressure decreases. CONSTITUTION: A heat exchanger(2) for heating fuel is installed in a fuel supply line. A mixer for mixing the heat-exchanged fuel with exterior air is connected to the heat exchanger. A fuel pump supplies the fuel in a fuel outlet line(1a) of the heat exchanger. Shutoff valves(7a,7b) open or close a first fuel supply line(5b) connecting the fuel outlet line of the heat exchanger and a fuel pump. A pressure sensor(4a) is connected to an input terminal of an engine control unit(ECU) and senses the fuel pressure of the fuel outlet line of the heat exchanger. The shut off valves and the fuel pump are connected to the output terminal of the engine control unit. The engine control unit senses the fuel pressure of the fuel outlet line by the medium of the pressure sensor and controls the drive of the fuel pump and the shut off valves.

Description

액화천연가스 차량의 연료공급장치{Fuel supplying device for liquefied natural gas vehicle}Fuel supplying device for liquefied natural gas vehicle

본 발명은 액화천연가스 차량의 연료공급장치에 관한 것으로, 특히 액화천연가스 차량이 고속으로 주행하거나 혹은 급발진할 때에 안정적인 연료공급이 이루어지도록 한 액화천연가스 차량의 연료공급장치에 관한 것이다.The present invention relates to a fuel supply device for a liquefied natural gas vehicle, and more particularly, to a fuel supply device for a liquefied natural gas vehicle to provide a stable fuel supply when the liquefied natural gas vehicle travels at a high speed or rapidly starts.

종래 액화천연가스(LNG; Liquefied Natural Gas)를 연료로 사용하는 차량의 연료공급장치는 연료가 저장된 연료탱크와, 이 연료탱크로부터 공급되는 연료의 압력을 조절하는 레귤레이터, 상기 연료탱크로부터 공급되는 연료의 온도를 높이기 위한 열교환기, 이 열교환기에 의해 가열된 연료를 외기와 혼합하여 엔진으로 공급하는 믹서 등을 구비하고 있다.Conventionally, a fuel supply apparatus of a vehicle using Liquefied Natural Gas (LNG) as a fuel includes a fuel tank in which fuel is stored, a regulator for adjusting a pressure of the fuel supplied from the fuel tank, and a fuel supplied from the fuel tank. And a heat exchanger for raising the temperature of the gas, a mixer for mixing the fuel heated by the heat exchanger with the outside air and supplying the engine to the engine.

상기 연료탱크내의 연료의 압력은 대략 10bar 정도이고, 상기 열교환기를 통해 열교환되어 믹서로 공급되는 연료의 압력은 8bar 정도이다.The pressure of the fuel in the fuel tank is about 10 bar, the pressure of the fuel heat exchanged through the heat exchanger to the mixer is about 8 bar.

상기와 같은 종래의 연료공급장치를 구비한 액화천연가스 차량이 고속으로 주행하거나 혹은 급발진시에 많은 양의 연료가 필요하게 되고, 이에 따라 상기 레귤레이터와 믹서 사이에 순간적으로 압력이 5 내지 6bar 정도로 저하되면서 액화천 연가스의 농도가 낮아져 불완전 연소가 이루어지거나 액화천연가스의 공급이 원활해지지 못해서 엔진의 부조화 및 가속 성능의 저하가 야기된다.The liquefied natural gas vehicle equipped with the conventional fuel supply device as described above requires a large amount of fuel when traveling at high speed or suddenly starting, and thus the pressure decreases instantaneously between 5 and 6 bar between the regulator and the mixer. As the concentration of the liquefied natural gas is lowered, incomplete combustion is made or the supply of the liquefied natural gas is not smoothed, causing mismatch of the engine and deterioration of acceleration performance.

또한 지속적으로 혹은 급진적으로 연료의 소모량이 증가할 경우에 연료탱크내의 액화천연가스의 기화반응이 늦어져 순간적으로 연료의 공급에 공백이 발생하는 결점이 있었다.In addition, if the consumption of fuel is continuously or radically increased, the gasification reaction of liquefied natural gas in the fuel tank is delayed, causing a shortage of fuel supply.

상기와 같은 결점을 해소하기 위해 연료탱크내의 압력차를 이용하여 연료의 일부를 빼내어서 기화시킨 후에 연료탱크로 재주입하는 방법이 사용되고 있지만, 이러한 방안에서는 연료탱크 내부의 압력이 기화 속도 및 연료 주입 속도에 많은 제약을 주게 되어 실질적인 응답성이 낮아져서 효과가 미흡한 결점이 있었다.In order to alleviate the above drawbacks, a method of extracting a part of fuel and vaporizing it by using the pressure difference in the fuel tank and then re-injecting it into the fuel tank is used. There were many drawbacks to speed, which made the response less effective.

이에 본 발명은 상기한 사정을 감안하여 안출된 것으로, 액화천연가스 차량이 고속으로 주행하거나 급발진시에 연료의 급작스런 소모로 연료공급라인의 압력이 저하될 때에 연료펌프를 사용하여 연료를 믹서로 직접 공급함과 더불어 연료탱크로도 연료를 재공급해서 연료가 원활한 압력으로 지속적으로 안정되게 공급되게 해서 엔진의 부조화와 가속 불능 현상을 효과적으로 방지하도록 한 액화천연가스 차량의 연료공급장치를 제공함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above circumstances, and when a liquefied natural gas vehicle runs at high speed or suddenly consumes fuel during sudden start-up, the fuel is directly supplied to the mixer using a fuel pump when the pressure in the fuel supply line is reduced. In addition to supplying fuel to the fuel tank, the fuel supply system of the LNG car is designed to effectively prevent engine mismatch and acceleration due to the fuel supply being continuously and stably supplied at a smooth pressure. have.

상기와 같은 목적을 달성하기 위한 본 발명은, 연료탱크에서 엔진으로 공급되는 연료공급라인의 연료압력이 소정 압력 이하로 저하될 경우에 상기 연료탱크의 연료를 연료펌프가 펌핑하여 상기 연료공급라인으로 연료를 추가로 공급하도록 되어 있다.The present invention for achieving the above object, when the fuel pressure of the fuel supply line supplied to the engine from the fuel tank is lowered below a predetermined pressure, the fuel pump pumps the fuel of the fuel tank to the fuel supply line It is supposed to supply additional fuel.

바람직하기로는 상기 연료공급라인에는 연료를 가열하는 열교환기가 설치되고, 상기 열교환기에서 열교환된 연료를 외기와 혼합하는 믹서가 상기 열교환기에 연결되면, 상기 열교환기의 연료출구라인에서 상기 연료펌프가 연료를 펌핑하여 공급하도록 된 것을 특징으로 한다.Preferably, the fuel supply line is provided with a heat exchanger for heating the fuel, and when the mixer for mixing the heat exchanged fuel in the heat exchanger with the outside is connected to the heat exchanger, the fuel pump at the fuel outlet line of the heat exchanger is fuel It characterized in that the pumped to supply.

상기 연료펌프와 상기 열교환기의 연료출구라인을 연결하는 제1연료공급라인을 개폐하는 개폐밸브가 설치되고, 상기 열교환기의 연료출구라인의 연료 압력을 감지하는 압력센서가 설치되며, 상기 압력센서는 엔진제어유니트의 입력단에 접속되는 반면에 상기 개폐밸브와 연료펌프는 엔진제어유니트의 출력단에 접속되어서 상기 엔진제어유니트가 상기 압력센서를 매개로 상기 연료출구라인의 연료 압력을 감지해서 상기 개폐밸브와 상기 연료펌프의 구동을 제어하도록 된 것을 특징으로 한다.An on / off valve for opening and closing a first fuel supply line connecting the fuel pump and the fuel outlet line of the heat exchanger is installed, a pressure sensor for detecting the fuel pressure of the fuel outlet line of the heat exchanger is installed, and the pressure sensor Is connected to the input end of the engine control unit, while the on-off valve and the fuel pump are connected to the output end of the engine control unit so that the engine control unit senses the fuel pressure of the fuel outlet line via the pressure sensor to open the on-off valve. And control the driving of the fuel pump.

상기 연료탱크와 연료펌프 사이에는 연료인출라인이 연결되고, 상기 연료인출라인에 연료를 단열팽창시키는 단열팽창밸브가 설치되며, 상기 단열팽창밸브는 상기 엔진제어유니트의 출력단에 접속되어 엔진제어유니트의 제어신호에 따라 개폐 작동하는 것을 특징으로 한다.A fuel lead-out line is connected between the fuel tank and the fuel pump, and an adiabatic expansion valve is installed in the fuel lead-out line to insulate and expand the fuel, and the adiabatic expansion valve is connected to an output end of the engine control unit and is connected to an engine control unit. It is characterized in that the opening and closing operation according to the control signal.

상기 연료탱크의 연료 압력을 감지하는 제2압력센서가 설치되고, 상기 연료펌프에서 펌핑된 연료를 상기 연료탱크로 재주입시키는 제2연료공급라인이 연료펌프와 연료탱크 사이에 설치되며, 상기 제2연료공급라인을 개폐하는 제2개폐밸브가 설치되고, 상기 제2압력센서는 상기 엔진제어유니트의 입력단에 접속되는 반면에 상기 제2개폐밸브는 엔진제어유니트의 출력단에 접속되어, 상기 제2압력센서에 의해 감지된 연료탱크의 연료 압력이 소정 압력 이하로 저하될 경우에 상기 엔진제어유니트가 제2개폐밸브를 개방하여 연료펌프로부터 펌핑된 연료가 연료탱크로 재주입되도록 된 것을 특징으로 한다.A second pressure sensor for detecting the fuel pressure of the fuel tank is installed, and a second fuel supply line for re-injecting the fuel pumped from the fuel pump into the fuel tank is installed between the fuel pump and the fuel tank, A second opening / closing valve for opening and closing the second fuel supply line is installed, and the second pressure sensor is connected to an input end of the engine control unit, while the second opening / closing valve is connected to an output end of the engine control unit, And when the fuel pressure of the fuel tank sensed by the pressure sensor drops below a predetermined pressure, the engine control unit opens the second opening / closing valve so that the fuel pumped from the fuel pump is reinjected into the fuel tank. .

상기 제2연료공급라인이 연료탱크에 접속되는 부위에는 연료를 연료탱크의 내부로 분사하는 인젝터가 추가로 설치된 것을 특징으로 한다.An injector for injecting fuel into the fuel tank is additionally installed at a portion where the second fuel supply line is connected to the fuel tank.

본 발명에 따른 액화천연가스 차량의 연료공급장치에 의하면, 액화천연가스 차량이 고속으로 주행하거나 급발진하여 연료의 소모량이 급작스럽게 많아져서 연료탱크로부터 엔진으로 공급되는 연료의 압력이 저하될 경우에 연료탱크로부터 연료를 연료펌프가 직접 펌핑하여 엔진으로 추가로 공급함으로써, 연료의 공급이 지속적으로 안정되게 이루어져 엔진의 부조화나 급가속 불능 등을 방지하고, 차량의 주행 안정성을 향상시키는 등의 효과가 있다. According to the fuel supply device of a liquefied natural gas vehicle according to the present invention, when the liquefied natural gas vehicle travels at high speed or suddenly starts, the fuel consumption is suddenly increased so that the pressure of the fuel supplied from the fuel tank to the engine is reduced. By directly supplying fuel to the engine by directly pumping the fuel from the tank, the fuel supply is continuously stabilized, thereby preventing the engine from being inconsistent or sudden acceleration, and improving the driving stability of the vehicle. .

이하 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1에는 본 발명에 따른 액화천연가스 차량의 연료공급장치의 구조가 도시되어 있는 바, 즉 연료탱크(1)에서 공급되는 연료를 열교환을 통해 가열하기 위해 연료탱크(1)의 연료출구라인(1a)에는 열교환기(2)가 연결되고, 상기 열교환기(2)에 의해 가열된 연료를 외기와 혼합하는 믹서로 공급하기 위해 상기 열교환기(2)의 연 료출구라인(2a)은 믹서와 연결된다.1 shows a structure of a fuel supply device of a liquefied natural gas vehicle according to the present invention, that is, the fuel outlet line of the fuel tank 1 to heat the fuel supplied from the fuel tank 1 through heat exchange ( The heat exchanger 2 is connected to 1a, and the fuel outlet line 2a of the heat exchanger 2 is connected to the mixer to supply the fuel heated by the heat exchanger 2 to the mixer for mixing with the outside air. Connected.

상기 연료탱크(1) 내부의 압력과 상기 연료출구라인(1a)의 연료압력을 조절하기 위해 레귤레이터(3)가 상기 연료탱크(1)와 연료출구라인(1a)에 연결되고, 상기 연료탱크(1) 내부의 압력을 감지하도록 압력센서(4a)가 연료탱크(1)에 설치됨과 더불어 상기 열교환기(2)의 연료출구라인(2a)의 연료 압력을 감지하도록 압력센서(4b)가 연료출구라인(2a)에 설치된다.The regulator 3 is connected to the fuel tank 1 and the fuel outlet line 1a to adjust the pressure inside the fuel tank 1 and the fuel pressure of the fuel outlet line 1a, and the fuel tank ( 1) The pressure sensor 4a is installed in the fuel tank 1 to sense the pressure inside, and the pressure sensor 4b is configured to detect the fuel pressure of the fuel outlet line 2a of the heat exchanger 2. It is installed in the line 2a.

상기 연료탱크(1)의 연료를 인출하여 펌핑하는 연료펌프(5)가 연료인출라인(5a)을 통해 연료탱크(1)와 연결되고, 상기 연료인출라인(5a)에는 연료를 단열팽창시키는 단열팽창밸브(6)가 설치되어 있다.A fuel pump 5 for extracting and pumping the fuel of the fuel tank 1 is connected to the fuel tank 1 through a fuel lead-out line 5a, and the fuel lead-out line 5a adiabaticly expands the fuel. The thermal expansion valve 6 is provided.

또한 상기 연료펌프(5)에서 펌핑된 연료를 공급하기 위해 연료펌프(5)의 제1연료공급라인(5b)은 상기 열교환기의 연료출구라인(2a)과 연결되어, 연료펌프(5)에서 펌핑된 연료를 열교환기에서 유출되는 연료와 함께 직접 믹서로 공급할 수 있게 된다.In addition, the first fuel supply line (5b) of the fuel pump 5 is connected to the fuel outlet line (2a) of the heat exchanger to supply the fuel pumped from the fuel pump (5), in the fuel pump (5) The pumped fuel can be fed directly to the mixer together with the fuel flowing out of the heat exchanger.

그리고 상기 연료펌프(5)의 제2연료공급라인(5c)은 상기 연료탱크(1)와 연결되어 연료펌프에서 펌핑된 연료가 다시 연료탱크(1)로 재주입되게 된다.The second fuel supply line 5c of the fuel pump 5 is connected to the fuel tank 1 so that the fuel pumped from the fuel pump is reinjected into the fuel tank 1 again.

상기 연료펌프(5)의 제1연료공급라인(5b)을 개폐하는 개폐밸브(7a)와 상기 제2연료공급라인(5c)을 개폐하는 개폐밸브(7b)가 각각 제1,2연료공급라인(5b,5c)에 설치된다.On-off valve 7a for opening and closing the first fuel supply line 5b of the fuel pump 5 and the on-off valve 7b for opening and closing the second fuel supply line 5c are first and second fuel supply lines, respectively. It is provided in (5b, 5c).

상기 2개의 압력센서(4a,4b)에서 감지한 압력은 엔진제어유니트(ECU)에 입력되게 각 압력센서(4a,4b)는 엔진제어유니트(ECU)의 입력단에 접속되고, 상기 엔진 제어유니트(ECU)의 출력단에는 상기 단열팽창밸브(6)와 2개의 개폐밸브(7a,7b) 및 상기 연료펌프(5)가 각각 접속되어 엔진제어유니트(ECU)의 제어신호에 따라 그 동작이 제어되게 된다.Each of the pressure sensors 4a and 4b is connected to an input terminal of the engine control unit ECU so that the pressure sensed by the two pressure sensors 4a and 4b is input to the engine control unit ECU. The adiabatic expansion valve 6, two on-off valves 7a and 7b and the fuel pump 5 are respectively connected to the output end of the ECU so that the operation is controlled according to the control signal of the engine control unit ECU. .

먼저 액화천연가스 차량의 엔진으로의 연료공급은 상기 연료탱크(1)에서부터 유출된 연료가 열교환기를 거쳐서 믹서를 통해 외기와 혼합된 다음에 엔진으로 정상적으로 공급되게 된다.First, the fuel supply to the engine of the liquefied natural gas vehicle is normally supplied to the engine after the fuel discharged from the fuel tank 1 is mixed with the outside air through a mixer through a heat exchanger.

상기와 같은 정상적인 연료공급과정에 상기 엔진제어유니트는 2개의 압력센서(4a,4b)를 매개로 열교환기(2)의 연료출구라인(2a)과 연료탱크 내부의 압력을 실시간으로 감지하게 된다.In the normal fuel supply process as described above, the engine control unit detects the pressure in the fuel outlet line 2a of the heat exchanger 2 and the pressure inside the fuel tank in real time through two pressure sensors 4a and 4b.

만일 액화천연가스 차량이 고속으로 주행하거나 급발진할 경우에 다량의 연료가 급격이 소모되면, 열교환기의 연료출구라인(2a)의 연료압력이 소정 압력 이하(5 내지 6bar)로 급격히 저하되고, 상기 엔진제어유니트(ECU)는 압력센서(4b)를 매개로 이를 감지하여 상기 단열팽창밸브(6)에 제어신호를 인가해서 단열팽창밸브(6)를 개방시킴과 더불어 상기 연료펌프(5)에도 제어신호를 인가하여 연료펌프를 구동하게 된다.If a large amount of fuel is suddenly consumed when the liquefied natural gas vehicle runs at a high speed or rapidly starts, the fuel pressure of the fuel outlet line 2a of the heat exchanger is rapidly lowered below a predetermined pressure (5 to 6 bar). The engine control unit (ECU) detects this through the pressure sensor 4b and applies a control signal to the adiabatic expansion valve 6 to open the adiabatic expansion valve 6 and also controls the fuel pump 5. The signal is applied to drive the fuel pump.

이에 따라 연료탱크내의 연료가 인출되어 단열팽창밸브(5)를 통해 단열팽창된 후에 연료펌프에 의해 펌핑되게 된다.Accordingly, the fuel in the fuel tank is drawn out and adiabaticly expanded through the adiabatic expansion valve 5 and then pumped by the fuel pump.

그리고 엔진제어유니트(ECU)는 상기 제1연료공급라인(5b)의 개폐밸브(7a)에 제어신호를 인가하여 연료펌프의 제1연료공급라인(5b)을 개방함에 따라 연료펌프에서 펌핑된 연료가 제1연료공급라인(5b)을 통해 열교환기의 연료출구라인(2a)에 직 접 공급되어 열교환기를 통해 열교환된 연료와 함께 믹서로 보내져서 엔진으로 유입되게 됨으로써, 연료가 적절한 압력으로 안정되게 공급된다.The engine control unit ECU applies a control signal to the on / off valve 7a of the first fuel supply line 5b to open the first fuel supply line 5b of the fuel pump and thus the fuel pumped from the fuel pump. Is supplied directly to the fuel outlet line (2a) of the heat exchanger through the first fuel supply line (5b) is sent to the mixer with the fuel heat exchanged through the heat exchanger to be introduced into the engine, so that the fuel is stabilized at an appropriate pressure Supplied.

한편 상기 연료탱크(1) 내부의 압력을 감지하는 압력센서(4a)에 의해 감지된 압력이 저하된 경우에 엔진제어유니트는 상기 개폐밸브(7b)에 제어신호를 인가하여 개폐밸브를 개방시키고, 이에 따라 연료펌프에서 펌핑된 연료가 제2연료공급라인(5C)을 통해 다시 연료탱크의 내부로 재주입되어 연료탱크의 압력을 적절한 압력으로 상승시키게 된다.On the other hand, when the pressure sensed by the pressure sensor 4a for detecting the pressure inside the fuel tank 1 is lowered, the engine control unit applies a control signal to the on-off valve 7b to open the on-off valve, Accordingly, the fuel pumped from the fuel pump is re-injected into the fuel tank again through the second fuel supply line 5C to raise the pressure of the fuel tank to an appropriate pressure.

이때에 연료탱크에 인젝터를 설치하여 연료를 기화된 상태로 연료탱크의 내부로 직접 분사하여 재주입하는 것이 바람직하다.At this time, it is preferable to install an injector in the fuel tank and inject the fuel directly into the fuel tank to re-inject the fuel in a vaporized state.

도 1은 본 발명에 따른 액화천연가스 차량의 연료공급장치의 구성도이다.1 is a block diagram of a fuel supply device for a liquefied natural gas vehicle according to the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

1-연료탱크 2-열교환기1-Fuel Tank 2-Heat Exchanger

3-레귤레이터 4a,4b-압력센서3-regulator 4a, 4b pressure sensor

5-연료펌프 6-단열팽창밸브5-fuel pump 6-insulation expansion valve

7a,7b-개폐밸브7a, 7b open / close valve

Claims (6)

연료탱크에서 엔진으로 공급되는 연료공급라인의 연료압력이 소정 압력 이하로 저하될 경우에 상기 연료탱크의 연료를 연료펌프가 펌핑하여 상기 연료공급라인으로 연료를 추가로 공급하도록 된 액화천연가스 차량의 연료공급장치.When the fuel pressure of the fuel supply line supplied from the fuel tank to the engine falls below a predetermined pressure, the fuel pump pumps the fuel of the fuel tank to supply additional fuel to the fuel supply line. Fuel supply. 청구항 1에 있어서, 상기 연료공급라인에는 연료를 가열하는 열교환기가 설치되고, 상기 열교환기에서 열교환된 연료를 외기와 혼합하는 믹서가 상기 열교환기에 연결되면, 상기 열교환기의 연료출구라인에서 상기 연료펌프가 연료를 펌핑하여 공급하도록 된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치. The fuel supply line of claim 1, wherein a heat exchanger for heating fuel is installed in the fuel supply line, and a mixer for mixing the heat exchanged fuel in the heat exchanger with outside air is connected to the heat exchanger. Fuel supply device of a liquefied natural gas vehicle characterized in that the pumping to supply the fuel. 청구항 2에 있어서, 상기 연료펌프와 상기 열교환기의 연료출구라인을 연결하는 제1연료공급라인을 개폐하는 개폐밸브가 설치되고, 상기 열교환기의 연료출구라인의 연료 압력을 감지하는 압력센서가 설치되며, 상기 압력센서는 엔진제어유니트의 입력단에 접속되는 반면에 상기 개폐밸브와 연료펌프는 엔진제어유니트의 출력단에 접속되어서 상기 엔진제어유니트가 상기 압력센서를 매개로 상기 연료출구라인의 연료 압력을 감지해서 상기 개폐밸브와 상기 연료펌프의 구동을 제어하도록 된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치. The method of claim 2, wherein the on-off valve for opening and closing the first fuel supply line connecting the fuel pump and the fuel outlet line of the heat exchanger is installed, the pressure sensor for detecting the fuel pressure of the fuel outlet line of the heat exchanger is installed. Wherein, the pressure sensor is connected to the input terminal of the engine control unit, while the on-off valve and the fuel pump is connected to the output terminal of the engine control unit so that the engine control unit to control the fuel pressure of the fuel outlet line via the pressure sensor A fuel supply device for a liquefied natural gas vehicle, characterized in that for sensing and controlling the driving of the on-off valve and the fuel pump. 청구항 3에 있어서, 상기 연료탱크와 연료펌프 사이에는 연료인출라인이 연 결되고, 상기 연료인출라인에 연료를 단열팽창시키는 단열팽창밸브가 설치되며, 상기 단열팽창밸브는 상기 엔진제어유니트의 출력단에 접속되어 엔진제어유니트의 제어신호에 따라 개폐 작동하는 것을 특징으로 하는 액화천연가스 차량의 연료공급장치.The fuel extraction line is connected between the fuel tank and the fuel pump, and an adiabatic expansion valve is installed in the fuel extraction line to adiabaticly expand the fuel, and the adiabatic expansion valve is provided at an output end of the engine control unit. A fuel supply device for a liquefied natural gas vehicle, which is connected and opened and closed according to a control signal of an engine control unit. 청구항 3에 있어서, 상기 연료탱크의 연료 압력을 감지하는 제2압력센서가 설치되고, 상기 연료펌프에서 펌핑된 연료를 상기 연료탱크로 재주입시키는 제2연료공급라인이 연료펌프와 연료탱크 사이에 설치되며, 상기 제2연료공급라인을 개폐하는 제2개폐밸브가 설치되고, 상기 제2압력센서는 상기 엔진제어유니트의 입력단에 접속되는 반면에 상기 제2개폐밸브는 엔진제어유니트의 출력단에 접속되어, 상기 제2압력센서에 의해 감지된 연료탱크의 연료 압력이 소정 압력 이하로 저하될 경우에 상기 엔진제어유니트가 제2개폐밸브를 개방하여 연료펌프로부터 펌핑된 연료가 연료탱크로 재주입되도록 된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치.The fuel cell of claim 3, wherein a second pressure sensor for detecting a fuel pressure of the fuel tank is installed, and a second fuel supply line for reinjecting the fuel pumped from the fuel pump into the fuel tank is provided between the fuel pump and the fuel tank. And a second opening / closing valve for opening and closing the second fuel supply line, wherein the second pressure sensor is connected to an input terminal of the engine control unit, while the second opening / closing valve is connected to an output terminal of the engine control unit. When the fuel pressure of the fuel tank sensed by the second pressure sensor falls below a predetermined pressure, the engine control unit opens the second opening / closing valve so that the fuel pumped from the fuel pump is reinjected into the fuel tank. Fuel supply device for liquefied natural gas vehicle, characterized in that the. 청구항 5에 있어서, 상기 제2연료공급라인이 연료탱크에 접속되는 부위에는 연료를 연료탱크의 내부로 분사하는 인젝터가 추가로 설치된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치.The fuel supply apparatus of claim 5, wherein an injector for injecting fuel into the fuel tank is further installed at a portion where the second fuel supply line is connected to the fuel tank.
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