KR20120051461A - Lng fuel supplying device for vehicle - Google Patents

Lng fuel supplying device for vehicle Download PDF

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Publication number
KR20120051461A
KR20120051461A KR1020100112904A KR20100112904A KR20120051461A KR 20120051461 A KR20120051461 A KR 20120051461A KR 1020100112904 A KR1020100112904 A KR 1020100112904A KR 20100112904 A KR20100112904 A KR 20100112904A KR 20120051461 A KR20120051461 A KR 20120051461A
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KR
South Korea
Prior art keywords
fuel
canister
engine
fuel tank
lng
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KR1020100112904A
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Korean (ko)
Inventor
이강웅
조병룡
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현대자동차주식회사
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Priority to KR1020100112904A priority Critical patent/KR20120051461A/en
Publication of KR20120051461A publication Critical patent/KR20120051461A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/035—Fuel tanks characterised by venting means
    • B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
    • F02D19/021—Control of components of the fuel supply system
    • F02D19/022—Control of components of the fuel supply system to adjust the fuel pressure, temperature or composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0236—Multi-way valves; Multiple valves forming a multi-way valve 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • 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 supply device for LNG(Liquefied Natural Gas) vehicles is provided to prevent damages of an engine and environmental pollutions by storing the fuel gas emitted to the outside fuel tank and supplying the gas to start the engine. CONSTITUTION: A fuel supply device for LNG(liquefied natural gas) vehicles comprises a LNG fuel tank(1), a canister(6), and a first check valve(7a). The LNG fuel tank supplies the fuel to an engine. The canister stores and collects evaporative gases of the LNG fuel tank and the canister supplies the stored fuel gas to the engine. The fuel tank is connected to the canister with connection lines(5). The first check valve opens and closes the connection lines according to the pressure.

Description

액화천연가스 차량의 연료공급장치{LNG fuel supplying device for vehicle}LNG fuel supplying device for vehicle

본 발명은 액화천연가스 차량에 관한 것으로, 특히 LNG 연료탱크에서 압력조절을 위해 대기로 방출되는 액화천연가스의 일부를 캐니스터에 포집하여 엔진으로 공급하도록 한 액화천연가스 차량의 연료공급장치에 관한 것이다.The present invention relates to a liquefied natural gas vehicle, and more particularly to a fuel supply device for a liquefied natural gas vehicle to collect a portion of the liquefied natural gas discharged to the atmosphere for pressure control in the LNG fuel tank to the canister to supply to the engine. .

천연가스는 공해를 발생시키지 않고 연료비가 저렴하기 때문에 차량에도 연료로 사용되고 있는 바, 이러한 천연가스 중에 액화천연가스(LNG; Liquefied natural Gas)는 비점이 -162℃이고, 비점 이하의 저온에서는 액체 상태로 단열 용기에 저장이 가능하며, 무색, 무취 가스로서 -113℃ 이상에서는 건조된 공기보다 가벼워서 대기 중으로 확산되는 성질이 있으며, 공기 중으로 누출시에 온도가 낮아져 공기 중의 수분 응축으로 안개가 발생되는 특징이 있다.Natural gas is used as a fuel in vehicles because it does not generate pollution and has a low fuel cost. Among these natural gas, liquefied natural gas (LNG) has a boiling point of -162 ° C and a liquid state at a low temperature below the boiling point. It is a colorless, odorless gas that is lighter than dried air at -113 ℃ and higher, and diffuses into the atmosphere.The temperature is lowered when it leaks into the air, causing fog due to condensation of moisture in the air. There is this.

상기와 같은 액화천연가스는 주로 상용 차량에 연료로 사용되고 있는 데, 액화천연가스를 연료로 사용하기 위한 종래의 차량의 연료공급장치는 액화천연가스를 저장할 수 있는 LNG 연료탱크와, 이 LNG 연료탱크에서 공급되는 연료를 증발시키는 증발기 및, 이 증발기를 통해 기화된 액화천연가스를 엔진으로 공급하는 연료공급라인 등을 구비한다.The liquefied natural gas as described above is mainly used as fuel in commercial vehicles, and the fuel supply device of a conventional vehicle for using liquefied natural gas as fuel includes an LNG fuel tank capable of storing liquefied natural gas, and the LNG fuel tank. And an evaporator for evaporating the fuel supplied from the fuel cell, and a fuel supply line for supplying liquefied natural gas vaporized through the evaporator to the engine.

상기 LNG 연료탱크에 저장된 액화천연가스는 매우 낮은 온도(-120 ~ -162℃) 상태에서 저장되지만 시간이 경과함에 따라 연료온도와 대기 온도와의 차이로 인해 LNG 연료탱의 연료온도는 상승하게 되고, 연료온도가 상승하면 LNG연료의 일부가 기화하여 연료탱크 내부의 압력이 상승하게 되는 데, 특정된 압력(최대 작동 압력) 이상으로 연료탱크 내부의 압력이 상승하면 LNG 연료탱크에 설치된 체크밸브를 통해 대기로 방출시키고 있었다.LNG stored in the LNG fuel tank is stored at a very low temperature (-120 ~ -162 ℃) state, but as time passes the fuel temperature of the LNG fuel tank is increased due to the difference between the fuel temperature and the ambient temperature As the fuel temperature rises, a portion of the LNG fuel vaporizes and the pressure inside the fuel tank increases.If the pressure inside the fuel tank rises above the specified pressure (maximum operating pressure), the check valve installed in the LNG fuel tank is opened. Through the atmosphere.

이에 본 발명은 상기한 사정을 감안하여 안출된 것으로, LNG 연료탱크의 온도 상승으로 인해 기화된 가스의 일부를 압력조절을 위해 대기 중으로 방출시키지 않고 캐니스터에 저장했다가 엔진으로 공급되게 함으로써 연료의 소비 효율을 향상시키고 대기 오염을 저감할 수 있도록 한 액화천연가스 차량의 연료공급장치를 제공함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above-mentioned circumstances, and consumes fuel by storing a part of vaporized gas to the canister without being released into the atmosphere for pressure control due to the temperature rise of the LNG fuel tank. It is an object of the present invention to provide a fuel supply device for a liquefied natural gas vehicle capable of improving efficiency and reducing air pollution.

상기와 같은 목적을 달성하기 위한 본 발명은, 엔진으로 연료를 공급하는 LNG 연료탱크와; 이 LNG 연료탱크의 증발가스를 포집하여 저장하고, 저장된 연료가스를 상기 엔진으로 공급하는 캐니스터를 구비한 것을 특징으로 한다.The present invention for achieving the above object, the LNG fuel tank for supplying fuel to the engine; And a canister for collecting and storing the evaporated gas of the LNG fuel tank and supplying the stored fuel gas to the engine.

바람직하기로는 상기 연료탱크와 캐니스터는 연결라인을 통해 상호 연결되고, 상기 연결라인을 압력에 따라 개폐하는 제1체크밸브가 설치된 것을 특징으로 한다.Preferably, the fuel tank and the canister are connected to each other through a connection line, characterized in that the first check valve for opening and closing the connection line according to the pressure is installed.

상기 연료탱크의 연료를 상기 엔진으로 공급하기 위해 상기 연료탱크는 연료공급라인을 통해 상기 엔진과 연결되고, 상기 연료공급라인을 개폐하는 3방향밸브가 상기 연료공급라인에 설치되며, 상기 3방향밸브에는 상기 캐니스터가 연결라인을 통해 연결된 것을 특징으로 한다.In order to supply the fuel of the fuel tank to the engine, the fuel tank is connected to the engine through a fuel supply line, and a three-way valve for opening and closing the fuel supply line is installed in the fuel supply line, and the three-way valve It characterized in that the canister is connected via a connection line.

상기 캐니스터와 상기 3방향밸브 사이의 상기 연결라인을 압력에 따라 개폐하는 제3체크밸브가 설치된 것을 특징으로 한다.And a third check valve for opening and closing the connection line between the canister and the three-way valve according to the pressure.

상기 캐니스터의 내부의 압력이 소정 압력 이상으로 상승하면 연료가스를 대기 중으로 방출하기 위해 상기 캐니스터에는 대기라인이 연결되고, 상기 대기라인에는 그 압력에 따라 개폐하는 제2체크밸브가 설치된 것을 특징으로 한다.When the pressure inside the canister rises above a predetermined pressure, a standby line is connected to the canister to discharge fuel gas into the atmosphere, and a second check valve is installed in the standby line to open and close according to the pressure. .

본 발명에 따른 액화천연가스 차량의 연료공급장치에 의하면, LNG 연료탱크의 온도 상승으로 인해 LNG 연료탱크 내부의 압력이 상승하여 연료탱크의 보호를 위해 연료가스를 연료탱크의 외부로 방출할 때에 방출되는 연료가스를 캐니스터로 보내어 저장되게 하고, 이렇게 저장된 연료가스를 엔진의 시동시에 엔진으로 우선적으로 공급되게 하여 연료로 사용되게 함으로써 연료의 대기 방출로 인한 환경 오염을 방지함과 더불어 연료의 소비 효율을 향상시키고, 엔진의 손상을 예방하여 내구성을 향상시키는 등의 효과가 있다. According to the fuel supply device of a liquefied natural gas vehicle according to the present invention, the pressure inside the LNG fuel tank is increased due to the temperature rise of the LNG fuel tank is released when the fuel gas is discharged to the outside of the fuel tank for protection of the fuel tank The fuel gas is sent to the canister for storage, and the stored fuel gas is preferentially supplied to the engine when the engine is started so that it can be used as a fuel, thereby preventing environmental pollution due to the emission of fuel, and fuel consumption efficiency. It is effective in improving the durability, preventing damage to the engine, and improving durability.

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.

이하 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the accompanying drawings.

도 1에는 본 발명에 따른 액화천연가스 차량의 연료공급장치의 구성이 도시되어 있는 바, 즉 소정 용량의 LNG 연료를 저장할 수 있는 LNG 연료탱크(1)의 토출구에는 증발기(2)가 연결되어, LNG 연료탱크로부터 배출되는 연료가 상기 증발기에서 기화되게 된다.1 shows a configuration of a fuel supply device for a liquefied natural gas vehicle according to the present invention, that is, an evaporator 2 is connected to an outlet of an LNG fuel tank 1 capable of storing LNG fuel having a predetermined capacity. Fuel discharged from the LNG fuel tank is vaporized in the evaporator.

상기 증발기(2)는 연료공급라인(3)을 통해 엔진(ENGINE)에 연결되어, 증발기(2)에서 기화된 연료가스가 엔진의 각 실린더로 공급되어 연료로 사용되게 된다.The evaporator 2 is connected to the engine ENGINE through the fuel supply line 3 so that the fuel gas vaporized in the evaporator 2 is supplied to each cylinder of the engine and used as fuel.

상기 LNG 연료탱크(1)의 토출구 측에는 솔레노이드밸브(4)가 설치되고, 이 솔레노이드밸브(4)는 엔진제어유니트(ECU)가 연결되어, 엔진제어유니트의 제어 신호에 따라 상기 솔레노이드밸브(4)가 온 혹은 오프되게 된다.A solenoid valve 4 is installed at the discharge port side of the LNG fuel tank 1, and the solenoid valve 4 is connected to an engine control unit (ECU), and the solenoid valve 4 is in accordance with a control signal of the engine control unit. Will be turned on or off.

또한 상기 LNG 연료탱크(1)의 상부에는 다른 토출구가 형성되면서 이 다른 토출구는 연결라인(5)을 통해 캐니스터(6)에 연결된다.In addition, while the other discharge port is formed in the upper portion of the LNG fuel tank 1, the other discharge port is connected to the canister 6 through the connection line (5).

이에 따라 상기 LNG 연료탱크(1) 내부의 기화된 연료가스는 상기 연결라인(5)을 통해 상기 캐스니터(6)로 공급되어 저장되게 된다.Accordingly, the vaporized fuel gas in the LNG fuel tank 1 is supplied to and stored in the caster 6 through the connection line 5.

상기 연결라인(5)에는 제1체크밸브(7a)가 설치되어, 상기 LNG 연료탱크 내부의 압력이 소정 압력, 예컨대 196psi 이상으로 상승하면 상기 제1체크밸브(7a)가 개방되면서 상기 연결라인(5)을 통해 LNG 연료탱크의 연료가스가 상기 연결라인과 제1체크밸브(7a)를 통해 상기 캐니스터(6)로 공급되게 된다.The connection line 5 is provided with a first check valve 7a. When the pressure inside the LNG fuel tank rises to a predetermined pressure, for example, 196 psi or more, the first check valve 7a is opened and the connection line ( 5) the fuel gas of the LNG fuel tank is supplied to the canister 6 through the connection line and the first check valve (7a).

상기 캐니스터(6)에는 캐니스터(6) 내부의 연료가스를 대기로 방출할 수 있도록 대기라인(8)이 연결되고, 이 대기라인(8)을 개폐하기 위해 제2체크밸브(7b)가 설치되어 있다.The canister 6 is connected to a standby line 8 so as to discharge fuel gas inside the canister 6 into the atmosphere, and a second check valve 7b is installed to open and close the standby line 8. have.

즉 상기 캐니스터(6)로 공급된 연료가스로 인해 캐니스터 내부의 압력이 소정 압력, 예컨대 190psi 이상으로 상승하면 상기 제2체크밸브(7b)가 개방되고, 캐니스터(6) 내부의 연료가스가 개방된 제2체크밸브(7b)와 대기라인(8)을 통해 대기로 방출되어, 캐니스터의 과도한 압력 상승으로 인한 손상을 방지하게 된다.That is, when the pressure inside the canister rises to a predetermined pressure, for example, 190 psi or more due to the fuel gas supplied to the canister 6, the second check valve 7b is opened, and the fuel gas inside the canister 6 is opened. It is discharged to the atmosphere through the second check valve (7b) and the standby line (8), thereby preventing damage due to excessive pressure rise of the canister.

상기 연료공급라인(3)에는 3방향밸브(9)가 설치되고, 이 3방향밸브(9)에는 상기 캐니스터(6)가 연결라인(10)을 통해 연결되어, 상기 캐니스터의 내부에 저장된 연료가스가 상기 연결라인(10)과 3방향밸브(9)를 통해 엔진으로 공급될 수 있게 된다.The fuel supply line (3) is provided with a three-way valve (9), the canister (6) is connected to the three-way valve (9) through the connection line 10, the fuel gas stored in the canister It can be supplied to the engine through the connection line 10 and the three-way valve (9).

상기 연결라인(10)의 그 내부의 압력에 따라 개폐하도록 연결라인(10)에는 제3체크밸브(7c)가 설치된다. 이 제3체크밸브(7c)는 캐니스터(6)의 압력이 100psi 이하로 떨어지면 연결라인(10)을 폐쇄하도록 설정된다.A third check valve 7c is installed in the connection line 10 so as to be opened and closed according to the pressure inside the connection line 10. The third check valve 7c is set to close the connection line 10 when the pressure of the canister 6 drops below 100 psi.

상기 3방향밸브(9)는 상기 엔진제어유니트(ECU)에 연결되어, 엔진제어유니트의 온 혹은 오프 제어신호에 따라 상기 연료공급라인(3)을 개방하고 상기 연결라인(10)을 폐쇄하여 LNG 연료탱크(1)의 연료가스가 엔진으로 공급되게 하거나 혹은 상기 연료공급라인(3)을 폐쇄하고 상기 연결라인(10)을 개방하여 캐니스터에 저장된 연료가스가 엔진으로 공급되게 제어된다.The three-way valve 9 is connected to the engine control unit (ECU) to open the fuel supply line (3) and close the connection line (10) in accordance with the on or off control signal of the engine control unit LNG The fuel gas of the fuel tank 1 is controlled to be supplied to the engine, or the fuel gas stored in the canister is supplied to the engine by closing the fuel supply line 3 and opening the connection line 10.

이상과 같이 구성된 본 발명에 따른 액화천연가스 차량의 연료공급장치에 따르면, 차량의 시동시에 웨더링 알람(weathering alarm)이 오프된 경우에 캐니스터의 내부 압력이 100psi 이상이면 상기 3방향밸브가 온 되어, 캐니스터 내부에 저장된 연료가스가 우선적으로 연료공급라인을 통해 엔진으로 공급되어 연료로 사용되게 된다.According to the fuel supply device of a liquefied natural gas vehicle according to the present invention configured as described above, when the weathering alarm is turned off when the vehicle is started, the three-way valve is turned on if the internal pressure of the canister is 100 psi or more. The fuel gas stored in the canister is first supplied to the engine through the fuel supply line and used as fuel.

상기 캐니스터 내부의 압력이 만일 100psi 이하이면 엔진의 출력 저하를 방지하기 위해 캐니스터와 3방향밸브 사이의 연결라인이 제3체크밸브에 의해 폐쇄됨과 더불어 3방향밸브도 오프되어, LNG 연료탱크의 연료가 엔진으로 공급되게 된다.If the pressure inside the canister is less than 100 psi, the connection line between the canister and the three-way valve is closed by the third check valve and the three-way valve is turned off to prevent the engine output from dropping. To the engine.

만일 웨더링 알람이 온 되면, 상기 엔진제어유니트는 상기 솔레노이드밸브에 개방 제어신호를 인가하여 줌으로써, 연료탱크 내부의 진공도를 낮추고, 열전달율을 높여 연료탱크의 기화를 가속화시켜 연료탱크 내부의 연료가스 량을 보충하여 원만한 주행이 이루어지고, 엔진을 보호할 수 있게 된다.If a weathering alarm is turned on, the engine control unit applies an open control signal to the solenoid valve, thereby lowering the vacuum in the fuel tank and increasing the heat transfer rate to accelerate the vaporization of the fuel tank to increase the amount of fuel gas in the fuel tank. In addition, smooth running is achieved and the engine can be protected.

한편 차량의 운행이 정지되어 시동이 오프된 상태에서 연료탱크의 온도가 상승하여 내부의 압력이 196psi 이상으로 상승하면, 상기 제1체크밸브가 개방됨과 더불어 상기 연결라인도 개방되어, 연료탱크 내부의 기화된 연료가스가 연결라인과 제1체크밸브를 통해 캐니스터로 보내어져 저장되게 된다.On the other hand, when the temperature of the fuel tank rises and the internal pressure rises to 196 psi or more while the vehicle is stopped and the engine is off, the first check valve is opened and the connection line is opened. The vaporized fuel gas is sent to the canister through the connection line and the first check valve for storage.

캐니스터로 연료가스가 공급되면서 저장되는 상태에서 캐니스터 내부의 압력이 190psi 이상으로 상승하면 상기 제2체크밸브가 개방됨과 더불이 이에 의해 대기라인도 개방되어, 캐니스터 내부의 연료가스가 대기로 방출됨으로써 캐니스터의 과도한 압력 상승으로 인한 손상을 방지하게 된다.When the pressure inside the canister rises to 190 psi or more while fuel gas is supplied to the canister, the second check valve is opened, and the standby line is also opened by this, and the fuel gas inside the canister is discharged to the atmosphere. To prevent damage due to excessive pressure rise.

1-LNG 연료탱크 2-증발기
3-연료공급라인 4-솔레노이드밸브
5,10-연결라인 6-캐니스터
7a,7b,7c-캐니스터 8-대기라인
9-3방향밸브1-LNG Fuel Tank 2-Evaporators
3-fuel supply line 4-solenoid valve
5,10 connection line 6-canister
7a, 7b, 7c-Canister 8-Standby Line
9-3 directional valve

Claims (5)

엔진으로 연료를 공급하는 LNG 연료탱크와; 이 LNG 연료탱크의 증발가스를 포집하여 저장하고, 저장된 연료가스를 상기 엔진으로 공급하는 캐니스터를 구비한 액화천연가스 차량의 연료공급장치.LNG fuel tank for supplying fuel to the engine; A fuel supply apparatus for a liquefied natural gas vehicle having a canister for collecting and storing evaporated gas of the LNG fuel tank and supplying the stored fuel gas to the engine. 청구항 1에 있어서, 상기 연료탱크와 캐니스터는 연결라인을 통해 상호 연결되고, 상기 연결라인을 압력에 따라 개폐하는 제1체크밸브가 설치된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치.The fuel supply device of claim 1, wherein the fuel tank and the canister are connected to each other through a connection line, and a first check valve is installed to open and close the connection line according to pressure. 청구항 1에 있어서, 상기 연료탱크의 연료를 상기 엔진으로 공급하기 위해 상기 연료탱크는 연료공급라인을 통해 상기 엔진과 연결되고, 상기 연료공급라인을 개폐하는 3방향밸브가 상기 연료공급라인에 설치되며, 상기 3방향밸브에는 상기 캐니스터가 연결라인을 통해 연결된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치.The fuel supply system of claim 1, wherein the fuel tank is connected to the engine through a fuel supply line to supply fuel from the fuel tank to the engine, and a three-way valve for opening and closing the fuel supply line is installed in the fuel supply line. And the canister is connected to the three-way valve through a connection line. 청구항 2에 있어서, 상기 캐니스터와 상기 3방향밸브 사이의 상기 연결라인을 압력에 따라 개폐하는 제3체크밸브가 설치된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치.The fuel supply apparatus of claim 2, wherein a third check valve is installed to open and close the connection line between the canister and the three-way valve according to pressure. 청구항 1에 있어서, 상기 캐니스터의 내부의 압력이 소정 압력 이상으로 상승하면 연료가스를 대기 중으로 방출하기 위해 상기 캐니스터에는 대기라인이 연결되고, 상기 대기라인에는 그 압력에 따라 개폐하는 제2체크밸브가 설치된 것을 특징으로 하는 액화천연가스 차량의 연료공급장치.The method of claim 1, wherein when the pressure inside the canister rises above a predetermined pressure, a standby line is connected to the canister to discharge fuel gas into the atmosphere, and a second check valve is opened and closed in response to the pressure. Fuel supply device for liquefied natural gas vehicle, characterized in that installed.
KR1020100112904A 2010-11-12 2010-11-12 Lng fuel supplying device for vehicle KR20120051461A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10343516B2 (en) 2015-10-09 2019-07-09 Volvo Truck Corporation Fuel tank arrangement for a dual fuel internal combustion engine
WO2021154551A1 (en) * 2020-01-30 2021-08-05 Caterpillar Inc. Separation and venting cryogenic liquid from vapor on a mobile machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10343516B2 (en) 2015-10-09 2019-07-09 Volvo Truck Corporation Fuel tank arrangement for a dual fuel internal combustion engine
WO2021154551A1 (en) * 2020-01-30 2021-08-05 Caterpillar Inc. Separation and venting cryogenic liquid from vapor on a mobile machine
US11608937B2 (en) 2020-01-30 2023-03-21 Caterpillar Inc. Separation and venting cryogenic liquid from vapor on a mobile machine

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