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KR20110036235A - Fuel collection system and method for gas engine - Google Patents

Fuel collection system and method for gas engine Download PDF

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Publication number
KR20110036235A
KR20110036235A KR1020090093789A KR20090093789A KR20110036235A KR 20110036235 A KR20110036235 A KR 20110036235A KR 1020090093789 A KR1020090093789 A KR 1020090093789A KR 20090093789 A KR20090093789 A KR 20090093789A KR 20110036235 A KR20110036235 A KR 20110036235A
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KR
South Korea
Prior art keywords
fuel
supply line
valve
fuel supply
vacuum
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KR1020090093789A
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Korean (ko)
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KR101088973B1 (en
Inventor
김정호
이선학
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한국지엠 주식회사
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Priority to KR1020090093789A priority Critical patent/KR101088973B1/en
Publication of KR20110036235A publication Critical patent/KR20110036235A/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
    • 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
    • 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
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/05—Miscellaneous constructional elements; Leakage detection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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

Abstract

PURPOSE: A device and a method for collecting fuel for a gas engine are provided to prevent fuel leakage by inhaling fuel using the vacuum force of a vacuum collection tank. CONSTITUTION: A device for collecting fuel for a gas engine comprises a fuel collection line(100), a vacuum collection tank(110), an intermittent valve(111), a fuel return valve(120), a first pressure sensor(131), a second pressure sensor(132), and an ECU(80). The fuel collection line is branched off from a first fuel supply line(60). The fuel return valve is operated at a first position, where closes the fuel collection line and opens the first fuel supply line, and a second position, where connects the fuel collection line and the fuel supply line. The first and second pressure sensors sense the fuel pressure of the inside the first fuel supply line. The ECU controls an injector(30), a fuel pump(20), and first and second cutoff valves(61,62).

Description

가스엔진의 연료회수장치 및 방법{Fuel Collection System AND Method for Gas Engine}Fuel Collection System AND Method for Gas Engine

본 발명은 가스엔진의 연료공급장치에 관한 것으로서, 연료긴급차단스위치를 작동한 이후 또는 엔진을 정지한 이후 연료공급라인에 누출이 발생하는 경우 연료공급라인에 잔류하는 연료를 진공탱크를 사용하여 긴급회수할 수 있도록 한 가스엔진의 연료회수장치 및 방법에 관한 것이다.The present invention relates to a fuel supply device for a gas engine, and when the fuel supply line leaks after the fuel emergency shutoff switch is operated or the engine is stopped, the fuel remaining in the fuel supply line is urged by using a vacuum tank. The present invention relates to a fuel recovery device and a method of a gas engine capable of recovery.

LPG, CNG, LNG 등의 가스연료를 연소시켜 동력을 발생하는 가스엔진의 연료 공급방법은, 연료탱크에 저장된 고압의 가스연료를 감압시켜 기체상태로 엔진의 흡기관에 공급하는 베이퍼라이저를 이용한 기상 분사방식과, 가스연료를 액체상태로 만들어 인젝터에 의해 분사하는 액상 인젝션 방식이 있다.The fuel supply method of a gas engine that generates power by burning gas fuel such as LPG, CNG, and LNG is gas phase injection using a vaporizer that decompresses a high-pressure gas fuel stored in a fuel tank and supplies the gas to an intake pipe of an engine in a gaseous state. There is a method and a liquid injection method in which a gas fuel is made into a liquid state and sprayed by an injector.

액상 인젝션 방식의 가스엔진에서는, 인젝터가 분사하고 남는 가스연료를 연료탱크로 상시 회수하는 회수방식과, 인젝터가 분사하고 남는 가스연료를 연료탱크로 회수하지 않는 비회수방식이 있다.In the liquid injection type gas engine, there are a recovery method for always recovering the gas fuel injected by the injector into the fuel tank, and a non-recovery method for recovering the gas fuel injected and injected by the injector into the fuel tank.

첨부도면 도 1에는, 종래의 액상 인젝션 비회수방식의 가스엔진의 연료공급시스템을 나타낸다.1, the fuel supply system of the conventional liquid injection non-recovery gas engine is shown.

도 1을 참조하면, 연료공급시스템은, 가스연료를 저장하는 연료탱크(10)와, 연료탱크내에 설치되어 액상의 가스연료를 펌핑하는 연료펌프(20)와, 연료펌프(20)에 의해 공급된 연료를 엔진으로 분사하는 인젝터(30)들이 설치되는 연료레일(40)과, 연료레일(40)에 공급되는 연료의 압력을 연료탱크(10)의 압력보다 높게 유지하도록 하는 압력조정기(50)와, 상기 연료 펌프(20)로부터 상기 압력조정기(50)를 연결하는 제1연료공급라인(60)과, 상기 압력조정기(50)와 연료레일(40)을 연결하는 제2연료공급라인(70)과, 연료공급계통을 전반적으로 제어하는 ECU(Eeletronic Control Unit)(80)를 포함한다.Referring to FIG. 1, the fuel supply system includes a fuel tank 10 storing gas fuel, a fuel pump 20 installed in the fuel tank to pump liquid gas fuel, and a fuel pump 20 supplied by the fuel pump 20. A fuel rail 40 in which the injectors 30 for injecting the fuel into the engine are installed, and a pressure regulator 50 for maintaining the pressure of the fuel supplied to the fuel rail 40 higher than the pressure of the fuel tank 10. And a first fuel supply line 60 connecting the pressure regulator 50 from the fuel pump 20, and a second fuel supply line 70 connecting the pressure regulator 50 and the fuel rail 40. ) And an ECU 80 for controlling the fuel supply system as a whole.

상기 연료펌프(20) 출구측의 제1연료공급라인(60)에 설치되는 제1컷오프 솔레노이드 밸브(cut-off solenoid valve)(61)(이하, '제1컷오프밸브'라고 약칭한다)와, 압력조정기(50) 입구측의 제1연료공급라인(60)에 설치되는 제2컷오프 솔레노이드 밸브(62)(이하, '제2컷오프밸브'라고 약칭한다)를 포함한다. 또한, 제1컷오프밸브(62) 상류측에는 릴리프밸브(63)가 설치되고, 연료레일(40)에는 압력센서(41)와 댐퍼(42)가 설치되는 경우도 있다.A first cut-off solenoid valve 61 (hereinafter, abbreviated as 'first cut-off valve') installed in the first fuel supply line 60 at the outlet of the fuel pump 20; And a second cutoff solenoid valve 62 (hereinafter, abbreviated as 'second cutoff valve') installed in the first fuel supply line 60 at the inlet side of the pressure regulator 50. In addition, a relief valve 63 may be provided upstream of the first cutoff valve 62, and a pressure sensor 41 and a damper 42 may be provided in the fuel rail 40.

그리고 운전석에는 연료 긴급차단스위치(90)가 설치되어, 시동을 끌 때나 사고시 운전자가 연료를 강제로 차단할 수 있도록 되어 있다.In addition, a fuel emergency cutoff switch 90 is installed in the driver's seat so that the driver can forcibly shut off the fuel when turning off the engine or during an accident.

이러한 가스연료공급 시스템에 있어서, 정상운전시에는 ECU(80)에 의해 제1컷오프밸브(61)와 제2컷오프밸브(62)가 모두 개방되어, 인젝터(30)로부터 연료가 정상적으로 분사된다.In such a gas fuel supply system, both the first cutoff valve 61 and the second cutoff valve 62 are opened by the ECU 80 during normal operation, and fuel is normally injected from the injector 30.

만일 운전자가 연료 긴급차단스위치(90)를 누르면, 제1컷오프밸브(61)와 제2 컷오프밸브(62)가 동시에 닫혀 연료를 차단하게 된다. 연료를 차단하면 제2연료공급라인(70)과 연료레일(40)에 남아있는 연료는 인젝터(30)로 분사되어 소모된다.If the driver presses the fuel emergency cutoff switch 90, the first cutoff valve 61 and the second cutoff valve 62 are simultaneously closed to cut off fuel. When the fuel is shut off, the fuel remaining in the second fuel supply line 70 and the fuel rail 40 is injected into the injector 30 to be consumed.

하지만, 제1컷오프밸브(61)와 제2컷오프밸브(62) 사이의 제1연료공급라인(60)에는 연료가 그대로 남아있게 된다. 또한, 엔진의 시동을 끌 때에도 제1컷오프밸브(61)와 제2컷오프밸브(62)는 닫히지만 제1컷오프밸브(61)와 제2컷오프밸브(62) 사이의 제1연료공급라인(60)에는 연료가 그대로 남아있게 된다.However, the fuel remains in the first fuel supply line 60 between the first cutoff valve 61 and the second cutoff valve 62. In addition, the first fuel supply line 60 between the first cutoff valve 61 and the second cutoff valve 62 is closed even though the first cutoff valve 61 and the second cutoff valve 62 are closed when the engine is turned off. ), Fuel remains intact.

이와 같이 제1연료공급라인(60)에 연료가 그대로 남아 있을 경우, 사고 또는 연결부의 불량이나 노화 등으로 인해 제1연료공급라인(60)에 누출이 발생하면 폭발 사고나 화재로 발전할 위험성이 크다.As such, when the fuel remains in the first fuel supply line 60, if a leak occurs in the first fuel supply line 60 due to an accident or a poor or aging connection, there is a risk of explosion or fire. Big.

본 발명은 상기와 같은 종래의 문제를 해결하기 위해, 엔진 정지 후나 연료 긴급차단스위치 작동시 제1컷오프밸브와 제2컷오프밸브 사이의 연료공급라인에 누출이 발생하는 경우 남아있는 연료를 회수할 수 있는 가스엔진의 연료회수장치 및 방법을 제공하는 것을 목적으로 한다.The present invention is to solve the above-mentioned problems, it is possible to recover the remaining fuel in the event of a leak in the fuel supply line between the first cut-off valve and the second cut-off valve after the engine stop or when operating the fuel emergency shut-off switch. An object of the present invention is to provide a fuel recovery apparatus and method for a gas engine.

상술한 목적을 달성하기 위하여 본 발명에 따른 가스엔진의 연료회수장치는, 메인 연료탱크 내에 설치되는 연료펌프와, 연료펌프에 의해 공급된 연료를 엔진으로 분사하는 인젝터가 설치되는 연료레일과, 연료레일에 공급되는 연료의 압력을 조정하는 압력조정기와, 상기 연료 펌프로부터 상기 압력조정기를 연결하는 제1연료공급라인과, 연료펌프 출구측의 제1연료공급라인에 설치되는 제1컷오프밸브와, 압력조정기 입구측의 제1연료공급라인에 설치되는 제2컷오프밸브를 포함하는 가스엔진의 연료공급시스템에 있어서, 상기 제1컷오프밸브와 제2컷오프밸브 사이의 제1연료공급라인 도중에서 분기되는 연료회수라인; 상기 연료회수라인에 설치되는 진공회수탱크 및 진공회수탱크에 설치된 단속밸브; 상기 제1연료공급라인과 연료회수라인의 분기점에 설치되어, 연료회수라인은 닫고 제1연료공급라인을 개방하는 제1위치와 연료회수라인과 제1연료공급라인을 서로 연통시키는 제2위치로 동작하는 연료리턴밸브; 상기 연료리턴밸브의 상류측과 하류측에 설치되어 제1연료공급라인 내부의 연료압력을 센싱하는 제1압력센서와 제2압력센서; 및 인젝터, 연료펌프, 제1, 2 컷오프밸브를 제어하고, 운전자에 의해 연료긴급차단스위치가 온(ON) 조작되거나 엔진이 정지한 이후, 상기 제1,2압력센서에서 입력되는 센싱신호를 처리하여 단위시간당 압력강하가 사전에 설정된 기준 값 이상이 되면 진공회수탱크의 단속밸브를 개방하고, 연료리턴밸브를 제2위치로 열도록 전환하여 진공회수탱크의 진공력이 제1연료공급라인에 작용하도록 제어하는 ECU를 포함한다.In order to achieve the above object, a fuel recovery apparatus of a gas engine according to the present invention includes a fuel pump installed in a main fuel tank, a fuel rail provided with an injector for injecting fuel supplied by the fuel pump into an engine, and a fuel; A pressure regulator for adjusting the pressure of the fuel supplied to the rail, a first fuel supply line connecting the pressure regulator from the fuel pump, a first cut-off valve installed in the first fuel supply line on the outlet side of the fuel pump; A fuel supply system of a gas engine comprising a second cutoff valve installed in a first fuel supply line at an inlet side of a pressure regulator, wherein the gas branch is branched in the middle of a first fuel supply line between the first cutoff valve and a second cutoff valve. Fuel recovery line; An intermittent valve installed in the vacuum recovery tank and the vacuum recovery tank installed in the fuel recovery line; Installed at the branch point of the first fuel supply line and the fuel recovery line, the fuel recovery line is closed to the first position to open the first fuel supply line and the second position to communicate the fuel recovery line and the first fuel supply line with each other A fuel return valve in operation; A first pressure sensor and a second pressure sensor installed at an upstream side and a downstream side of the fuel return valve to sense fuel pressure inside the first fuel supply line; And controlling the injector, the fuel pump, the first and second cut-off valves, and processing the sensing signal input from the first and second pressure sensors after the fuel emergency shutoff switch is turned on by the driver or the engine is stopped. When the pressure drop per unit time exceeds the preset reference value, the control valve of the vacuum recovery tank is opened and the fuel return valve is opened to the second position so that the vacuum force of the vacuum recovery tank acts on the first fuel supply line. ECU to be controlled.

상기한 본 발명의 연료회수장치에 있어서, 제1압력센서와 제1컷오프밸브 사이 및 제2압력센서와 제2컷오프밸브 사이에, ECU의 제어하에 제1연료공급라인을 개방하여 연료의 소통을 가능하게 하는 제1위치와 제1연료공급라인을 외기와 연통시키는 제2위치로 동작하는 제1, 제2 외기유입용 전환밸브를 각각 설치하여도 좋다.In the fuel recovery device of the present invention described above, the first fuel supply line is opened between the first pressure sensor and the first cutoff valve and between the second pressure sensor and the second cutoff valve to control the fuel communication. First and second external air inlet switching valves may be provided respectively, which operate at a first position to enable the second position and a second position to communicate the first fuel supply line with the outside air.

본 발명에 따른 가스엔진의 연료회수방법으로서, 연료긴급차단스위치가 작동되거나 엔진이 정지하는 경우 제1컷오프밸브와 제2컷오프밸브를 닫는 과정; 제1압력센서와 제2압력센서로부터 실시간으로 입력되는 센싱신호를 연산하여 단위시간당 압력강하값(ΔP1/Δt) 및 (ΔP2/Δt)을 산출하고, 산출된 값을 사전에 설정된 기준값과 비교하여 기준값 이상이 되면 제1연료공급라인에 연료 누출이 있는 것으로 판단하여, 진공탱크 단속밸브를 개방하여 진공회수탱크의 진공압이 연료회수라인에 작용하게 하는 과정; 연료리턴밸브를 제2위치로 전환하여 제1연료공급라인과 연료회수라인을 서로 연통하게 하여 진공회수탱크의 진공력이 제1연료공급라인에 작용하도록 하여 제1연료공급라인의 연료가 진공회수탱크에 흡인되도록 하는 과정을 포함한다.A fuel recovery method of a gas engine according to the present invention, comprising: closing the first cutoff valve and the second cutoff valve when the fuel emergency shutoff switch is operated or the engine is stopped; The sensing signals input in real time from the first pressure sensor and the second pressure sensor are calculated to calculate the pressure drop values ΔP 1 / Δt and ΔP 2 / Δt per unit time, and the calculated values are compared with the preset reference values. Comparing the first fuel supply line with a fuel leakage when the reference value is greater than the reference value, and opening the vacuum tank control valve so that the vacuum pressure of the vacuum recovery tank acts on the fuel recovery line; Switch the fuel return valve to the second position so that the first fuel supply line and the fuel recovery line communicate with each other so that the vacuum force of the vacuum recovery tank acts on the first fuel supply line so that the fuel of the first fuel supply line is vacuum recovered. And suctioning the tank.

상기한 본 발명의 연료회수방법에 있어서, 연료리턴밸브를 제2위치로 전환한 이후, 제1외기유입용 전환밸브 및 제2외기유입 전환밸브를 제2위치로 전환하여 제1연료공급라인에 외기가 작용하도록 하는 과정; 상기 제1, 2외기유입용 전환밸브를 제2위치로 전환한 시점부터 타이머에 의해 경과시간을 검출하여 사전에 설정된 시간이 지나면 진공탱크 단속밸브를 닫아 진공회수탱크를 밀폐하는 과정을 더 수행할 수 있다.In the above-described fuel recovery method of the present invention, after switching the fuel return valve to the second position, the first outside air inlet switching valve and the second outside air inlet switching valve are switched to the second position to the first fuel supply line. Allowing the outside air to work; Since the elapsed time is detected by a timer from the time point at which the first and second external air inlet switching valves are switched to the second position, and the predetermined time passes, the vacuum tank control valve is closed to further seal the vacuum recovery tank. Can be.

본 발명에 의한 가스엔진의 연료회수장치 및 방법에 의하면, 운전자에 의해 연료긴급차단스위치가 작동하거나 엔진이 정지해 있을 때 연료공급라인에 기준값 이상의 압력강하가 생기면 이를 감지하여 진공회수탱크의 진공력을 이용하여 흡인함으로써 연료 누출에 의한 사고를 방지할 수 있다.According to the fuel recovery device and method of the gas engine according to the present invention, when the fuel emergency shut-off switch is operated by the driver or the engine is stopped, if the pressure drop more than the reference value occurs in the fuel supply line to detect the vacuum force of the vacuum recovery tank By using the suction, it is possible to prevent an accident due to fuel leakage.

이하, 첨부도면을 참조하면서 본 발명의 바람직한 실시예를 더욱 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 가스엔진의 연료회수장치를 나타낸 것이다. 도 1과 동일한 구성요소에 대해서는 동일한 참조부호를 부여하여 설명한다. 연료탱크(10)는 '메인 연료탱크(10)'로 칭한다.2 shows a fuel recovery apparatus for a gas engine according to the present invention. The same components as in Fig. 1 will be described with the same reference numerals. The fuel tank 10 is referred to as a 'main fuel tank 10'.

도 2에 도시된 바와 같이, 본 발명의 연료회수장치에서는 제1컷오프밸브(61)와 제2컷오프밸브(62) 사이의 제1연료공급라인(60) 도중에서 연료회수라인(100)을 분기하여 설치한 형태이다.As shown in FIG. 2, in the fuel recovery apparatus of the present invention, the fuel recovery line 100 is branched in the middle of the first fuel supply line 60 between the first cutoff valve 61 and the second cutoff valve 62. It is installed in the form.

그리고 상기 연료회수라인(100)에는 진공회수탱크(110)를 설치하고, 제1연료공급라인(60)과 연료회수라인(100)의 분기점에 연료리턴밸브(120)를 설치한 구성으로 이루어진다.In addition, a vacuum recovery tank 110 is installed in the fuel recovery line 100, and a fuel return valve 120 is installed at a branch point of the first fuel supply line 60 and the fuel recovery line 100.

연료리턴밸브(120)는, ECU(80)의 제어하에 연료회수라인(100)은 닫고 제1연료공급라인(60)을 개방하는 제1위치와 연료회수라인(100)과 제1연료공급라인(60)을 서로 연통시키는 제2위치로 동작한다.The fuel return valve 120 has a first position and a fuel recovery line 100 and a first fuel supply line for closing the fuel recovery line 100 and opening the first fuel supply line 60 under the control of the ECU 80. Operate 60 at a second position in communication with each other.

진공회수탱크(110)는 내부에 진공이 유지되도록 제조되며, 입구 부분에 단속밸브(111)가 설치되어 있는 형태이다. 단속밸브(111)는 닫혀있는 상태로 제조되며, ECU(80)의 제어에 의해 개방되는 경우 진공회수탱크(110)에 부여된 진공력이 연료회수라인(100)이 작용하도록 한다.The vacuum recovery tank 110 is manufactured to maintain a vacuum therein, and is provided with an intermittent valve 111 at an inlet portion. The intermittent valve 111 is manufactured in a closed state, and the vacuum force applied to the vacuum recovery tank 110 causes the fuel recovery line 100 to act when opened by the control of the ECU 80.

또한, 연료리턴밸브(120)의 상류와 하류측에 제1압력센서(131)와 제2압력센서(132)가 설치되고, 상기 제1, 제2컷오프밸브(61, 62)에 인접하여서는 각각 제1, 제2 외기유입용 전환밸브(141, 142)가 설치된다.In addition, a first pressure sensor 131 and a second pressure sensor 132 are provided on the upstream and downstream sides of the fuel return valve 120, and adjacent to the first and second cutoff valves 61 and 62, respectively. First and second external air inlet switching valves 141 and 142 are provided.

제1, 2 외기유입용 전환밸브(141, 142)는 ECU(80)의 제어하에 제1연료공급라인(60)을 개방하여 연료의 소통을 가능하게 하는 제1위치와 제1연료공급라인(60)을 외기와 연통시키는 제2위치로 동작한다.The first and second external air inlet switching valves 141 and 142 open the first fuel supply line 60 under the control of the ECU 80 and allow the fuel to communicate with the first position and the first fuel supply line ( 60) to a second position in communication with the outside air.

ECU(80)는, 운전 상황이나 연료긴급차단스위치(90)의 조작 여부에 따라 인젝터(30), 연료펌프(20), 제1, 2 컷오프밸브(61, 62)를 제어한다. 또한, ECU(80)는, 연료긴급차단스위치(90)가 온(ON, 차단) 되거나 엔진이 정지하는 경우, 제1,2압력센서(131, 132)에서 입력되는 센싱신호를 처리하여 단위시간당 압력강하가 사전에 설정된 기준 값 이상이 되는 경우 단속밸브(111)를 열고 연료리턴밸브(120)를 제2위치로 전환하여 개방하며, 이어서 제1,2외기유입용 전환밸브(141, 142)를 개방하여 제1연료공급라인(60)에 잔류하는 연료가 진공회수탱크(110)로 빨려들어가도록 제어한다.The ECU 80 controls the injector 30, the fuel pump 20, and the first and second cutoff valves 61 and 62 according to the driving situation or whether the fuel emergency cutoff switch 90 is operated. In addition, the ECU 80 processes the sensing signal input from the first and second pressure sensors 131 and 132 per unit time when the fuel emergency cutoff switch 90 is turned ON or the engine is stopped. When the pressure drop is equal to or more than a preset reference value, the intermittent valve 111 is opened, and the fuel return valve 120 is opened by switching to the second position, and then the first and second external air inlet switching valves 141 and 142. Open to control the fuel remaining in the first fuel supply line 60 is sucked into the vacuum recovery tank (110).

이와 같이 구성된 본 발명의 가스엔진의 연료회수장치의 동작 과정을 도 3을 참조하여 설명한다. 구성요소에 대해서는 도 2를 병행 참조한다.An operation process of the fuel recovery device of the gas engine of the present invention configured as described above will be described with reference to FIG. 3. Refer to FIG. 2 for components.

정상운전시에는 ECU(80)의 제어에 의해 연료펌프(20)와 인젝터(30)를 제어하여 엔진을 구동한다. 이때, 제1,2 컷오프밸브(61, 62)는 개방되고, 연료리턴밸브(120)는 제1위치로 전환하여 연료회수라인(100)은 닫고 제1연료공급라인(60)을 개방하며, 제1, 2 외기유입용 전환밸브(141, 142)도 제1위치로 전환하여 외기는 차단하고 제1연료공급라인(60)의 연료의 소통을 가능하게 하는 상태를 유지한다.In normal operation, the engine is driven by controlling the fuel pump 20 and the injector 30 by the control of the ECU 80. At this time, the first and second cutoff valves 61 and 62 are opened, and the fuel return valve 120 is switched to the first position so that the fuel recovery line 100 is closed and the first fuel supply line 60 is opened. The first and second external air inlet switching valves 141 and 142 are also switched to the first position to block external air and maintain a state of enabling communication of fuel in the first fuel supply line 60.

이와 같은 상태에서, 운전자에 의해 연료 긴급차단스위치(90)가 작동되거나(s501), 엔진이 정지하면(s502), ECU(80)는 제1컷오프밸브(61)와 제2컷오프밸브(62)를 닫는다(s503).In this state, when the fuel emergency cutoff switch 90 is operated by the driver (s501), or when the engine is stopped (s502), the ECU 80 is the first cutoff valve 61 and the second cutoff valve 62. Close (s503).

이어서, 제1압력센서(131)와 제2압력센서(132)로부터 실시간으로 입력되는 센싱신호를 연산하여 단위시간당 압력강하값(ΔP1/Δt) 및 (ΔP2/Δt)을 산출하고 그 값이 사전에 설정된 기준값이 이상이 되면(s504)(s505), 제1연료공급라인(60)에 연료 누출이 있는 것으로 판단하여, 진공탱크 단속밸브(111)를 개방한다(s506). 진공탱크 단속밸브(111)가 개방되면, 진공회수탱크(110)의 진공압은 연료회수라 인(100)에 작용하게 된다.Subsequently, the sensing signals input in real time from the first pressure sensor 131 and the second pressure sensor 132 are calculated to calculate the pressure drop values ΔP 1 / Δt and (ΔP 2 / Δt) per unit time. When the preset reference value is equal to or greater than s504 (s505), it is determined that there is a fuel leak in the first fuel supply line 60, and the vacuum tank check valve 111 is opened (s506). When the vacuum tank regulator valve 111 is opened, the vacuum pressure of the vacuum recovery tank 110 acts on the fuel recovery line 100.

이 상태에서, 연료리턴밸브(120)를 제2위치로 전환한다(s507). 연료리턴밸브(120)가 제2위치로 전환됨에 따라 제1연료공급라인(60)과 연료회수라인(100)은 서로 연통하게 된다. 그러면, 진공회수탱크(110)의 진공력은 제1연료공급라인(60)에 작용하게 되어 제1연료공급라인(60)에 있는 연료가 일부 진공회수탱크(110)에 흡인된다. 제1연료공급라인(60)의 누출부의 구멍이나 틈새가 크다면 해당 누출부를 통해 제1연료공급라인(60)에 외기가 작용하기 때문에 제1연료공라인(60)의 연료는 진공회수탱크(110)에 거의 모두가 신속히 빨려들어가게 되고, 미세하면 서서히 빨려들어가게 된다.In this state, the fuel return valve 120 is switched to the second position (s507). As the fuel return valve 120 is switched to the second position, the first fuel supply line 60 and the fuel recovery line 100 communicate with each other. Then, the vacuum force of the vacuum recovery tank 110 acts on the first fuel supply line 60 so that the fuel in the first fuel supply line 60 is sucked into some vacuum recovery tank 110. If the hole or the gap of the leaking portion of the first fuel supply line 60 is large, the outside air acts on the first fuel supply line 60 through the leaking portion, so that the fuel of the first fuel supply line 60 is a vacuum recovery tank ( 110) almost everything is sucked quickly, and if fine, it is slowly sucked.

누출부의 구멍이나 틈새가 미세한 경우를 대비하여, 제1외기유입용 전환밸브(141) 및 제2외기유입 전환밸브(142)를 제2위치로 전환하여 제1연료공급라인(60)에 외기를 인위적으로 작용하도록 한다(s508). 진공력이 작용하고 있던 제1연료공급라인(60)이 외기와 연통하면, 제1연료공급라인(60)의 연료는 그 즉시 모두 진공회수탱크(110)로 흡인된다(s509).In case the hole or the gap of the leaking part is minute, the first outside air inflow switching valve 141 and the second outside air inflow switching valve 142 are switched to the second position, and the outside air is supplied to the first fuel supply line 60. To artificially work (s508). When the first fuel supply line 60, which has a vacuum force, communicates with the outside air, the fuel of the first fuel supply line 60 is immediately sucked into the vacuum recovery tank 110 (s509).

상기한 제1, 2외기유입용 전환밸브(141, 142)를 제2위치로 전환한 시점부터 ECU(80)는 내장 타이머에 의해 경과시간을 체크 하고, 사전에 설정된 시간이 지나면(s510), 진공탱크 단속밸브(511)를 닫아 진공회수탱크(110)에 흡입된 연료를 밀폐하여 가둔다(s511).The ECU 80 checks the elapsed time by the built-in timer from the time point at which the first and second external air inlet switching valves 141 and 142 are switched to the second position, and when the preset time elapses (s510), The vacuum tank intermittent valve 511 is closed to seal and trap the fuel sucked into the vacuum recovery tank 110 (s511).

이어서, 제1,2 외기유입용 전환밸브(141, 142)를 제1위치로 닫고(s512), 연료리턴밸브(120)도 제1위치로 닫는다(s513). 이러한 단계 s512와 s513은 연료공급 계통의 특성에 따라 선택적으로 수행하여도 좋다.Subsequently, the first and second external air inlet switching valves 141 and 142 are closed to the first position (s512), and the fuel return valve 120 is also closed to the first position (s513). These steps s512 and s513 may be selectively performed according to the characteristics of the fuel supply system.

이상 설명한 바와 같이, 본 발명에 따른 가스엔진의 연료회수장치 및 방법에 의하면, 운전자에 의해 연료긴급차단스위치가 작동하거나 엔진이 정지해 있을 때 연료공급라인에 누출이 발생한 것으로 판단되면 즉시 연료공급라인에 남아있는 연료를 진공회수탱크로 흡인할 수 있다.As described above, according to the fuel recovery device and method of the gas engine according to the present invention, if it is determined by the driver that the fuel emergency line switch is operated or the engine is stopped, the fuel supply line immediately leaks. The fuel remaining in the tank can be sucked into the vacuum recovery tank.

따라서, 본 발명에 의한 연료회수장치 및 방법을 가스엔진 자동차에 적용하는 경우, 연료공급라인의 각 연결부의 불량이나 노화 또는 사고 등으로 인해 연료공급라인에 누출이 발생하더라도 남아있는 연료를 즉각적으로 회수할 수 있으므로 폭발 사고나 화재로 방지할 수 있는 안전한 자동차를 구현할 수 있다.Therefore, when the fuel recovery apparatus and method according to the present invention are applied to a gas engine vehicle, even if a leak occurs in the fuel supply line due to a failure, aging or an accident at each connection part of the fuel supply line, the remaining fuel is immediately recovered. As a result, it is possible to implement a safe vehicle that can be prevented by an explosion or a fire.

이상에서는 첨부 도면에 도시된 본 발명의 구체적인 실시예를 상세하게 설명하였으나, 이는 본 발명의 바람직한 형태에 대한 예시에 불과한 것이며, 본 발명의 보호 범위가 이들에 한정되는 것은 아니다. 또한, 이상과 같은 본 발명의 실시예는 본 발명의 기술적 사상 내에서 당해 분야에 통상의 지식을 가진 자에 의해 다양한 변형 및 균등한 다른 실시가 가능한 것이며, 이러한 변형 및 균등한 다른 실시예들은 본 발명의 첨부된 특허청구범위에 속한다.In the above, specific embodiments of the present invention shown in the accompanying drawings have been described in detail, but these are merely illustrative of the preferred embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. In addition, the embodiments of the present invention as described above can be variously modified and equivalent other embodiments by those of ordinary skill in the art within the technical spirit of the present invention, such modifications and equivalent other embodiments are It belongs to the appended claims of the invention.

도 1은 일반적인 가스엔진 연료공급 시스템의 계통도이다.1 is a system diagram of a general gas engine fuel supply system.

도 2는 본 발명에 따른 가스엔진 연료공급 시스템의 계통도이다. 2 is a system diagram of a gas engine fuel supply system according to the present invention.

도 3은 본 발명에 따른 연료회수방법을 설명하기 위한 순서도이다. 3 is a flowchart illustrating a fuel recovery method according to the present invention.

<도면의 주요 부분에 대한 부호의 설명> <Explanation of symbols for the main parts of the drawings>

10 : 메인 연료탱크 20 : 연료펌프 10: main fuel tank 20: fuel pump

30 : 인젝터 40 : 연료레일 30: injector 40: fuel rail

41 : 압력센서 42 : 댐퍼 41: pressure sensor 42: damper

50 : 압력조정기 60 : 제1연료공급라인 50: pressure regulator 60: first fuel supply line

61 : 제1컷오프밸브 62 : 제2컷오프밸브 61: first cutoff valve 62: second cutoff valve

63 : 릴리프 밸브 90 : 연료긴급차단스위치 63: relief valve 90: fuel emergency switch

100 : 연료회수라인 110 : 진공회수탱크 100: fuel recovery line 110: vacuum recovery tank

111 : 단속밸브 120: 연료리턴밸브 111: intermittent valve 120: fuel return valve

131 : 제1압력센서 132 : 제2압력센서 131: first pressure sensor 132: second pressure sensor

141 : 제1외기유입용 전환밸브 142: 제2외기유입용 전환밸브 141: switching valve for the first external air inlet 142: switching valve for the second external air inlet

Claims (4)

가스연료를 저장하는 메인 연료탱크(10)와, 메인 연료탱크(10) 내에 설치되는 연료펌프(20)와, 연료펌프(20)에 의해 공급된 연료를 엔진으로 분사하는 인젝터(30)가 설치되는 연료레일(40)과, 연료레일(40)에 공급되는 연료의 압력을 조정하는 압력조정기(50)와, 상기 연료 펌프(20)로부터 상기 압력조정기(50)를 연결하는 제1연료공급라인(60)과, 연료펌프(20) 출구측의 제1연료공급라인(60)에 설치되는 제1컷오프밸브(61)와, 압력조정기(50) 입구측의 제1연료공급라인(60)에 설치되는 제2컷오프밸브(62)를 포함하는 가스엔진의 연료공급시스템에 있어서,The main fuel tank 10 for storing gas fuel, the fuel pump 20 installed in the main fuel tank 10, and the injector 30 for injecting the fuel supplied by the fuel pump 20 to the engine is installed. A first fuel supply line connecting the fuel rail 40, a pressure regulator 50 for adjusting the pressure of the fuel supplied to the fuel rail 40, and the pressure regulator 50 from the fuel pump 20. 60, the first cut-off valve 61 provided in the first fuel supply line 60 on the outlet side of the fuel pump 20, and the first fuel supply line 60 on the inlet side of the pressure regulator 50. In the fuel supply system of a gas engine comprising a second cut-off valve 62 is provided, 상기 제1컷오프밸브(61)와 제2컷오프밸브(62) 사이의 제1연료공급라인(60) 도중에서 분기되는 연료회수라인(100);A fuel recovery line (100) branched in the middle of the first fuel supply line (60) between the first cutoff valve (61) and the second cutoff valve (62); 상기 연료회수라인(100)에는 설치되는 진공회수탱크(110) 및 진공회수탱크(110)에 설치된 단속밸브(111);The fuel recovery line 100, the vacuum recovery tank 110 is installed and the intermittent valve 111 installed in the vacuum recovery tank 110; 상기 제1연료공급라인(60)과 연료회수라인(100)의 분기점에 설치되어, 연료회수라인(100)은 닫고 제1연료공급라인(60)을 개방하는 제1위치와 연료회수라인(100)과 제1연료공급라인(60)을 서로 연통시키는 제2위치로 동작하는 연료리턴밸브(120);A first position and a fuel recovery line 100 installed at a branch point of the first fuel supply line 60 and the fuel recovery line 100 to close the fuel recovery line 100 and open the first fuel supply line 60. ) And a fuel return valve 120 operating in a second position in communication with the first fuel supply line 60; 상기 연료리턴밸브(120)의 상류측과 하류측에 설치되어 제1연료공급라인(60) 내부의 연료압력을 센싱하는 제1압력센서(131)와 제2압력센서(132); 및A first pressure sensor 131 and a second pressure sensor 132 installed at an upstream side and a downstream side of the fuel return valve 120 to sense fuel pressure inside the first fuel supply line 60; And 인젝터(30), 연료펌프(20), 제1, 2 컷오프밸브(61, 62)를 제어하고, 운전자 에 의해 연료긴급차단스위치(90)가 온(ON) 조작되거나 엔진이 정지한 이후, 상기 제1,2압력센서(131, 132)에서 입력되는 센싱신호를 처리하여 단위시간당 압력강하가 사전에 설정된 기준 값 이상이 되면 진공회수탱크의 단속밸브(111)를 개방하고, 연료리턴밸브(120)를 제2위치로 열도록 전환하여 진공회수탱크(110)의 진공력이 제1연료공급라인(60)에 작용하도록 제어하는 ECU(80)를 포함하는 것을 특징으로 하는 가스엔진의 연료회수장치.After controlling the injector 30, the fuel pump 20, the first and second cutoff valves 61 and 62, the fuel emergency shutoff switch 90 is turned ON by the driver or the engine is stopped. When the pressure drop per unit time is processed by processing the sensing signals input from the first and second pressure sensors 131 and 132, the control valve 111 of the vacuum recovery tank is opened and the fuel return valve 120 Fuel recovery device for a gas engine, characterized in that it comprises an ECU (80) to switch to open the second position to control the vacuum force of the vacuum recovery tank 110 to act on the first fuel supply line (60). . 제1항에 있어서,The method of claim 1, 제1압력센서(131)와 제1컷오프밸브(61) 사이 및 제2압력센서(132)와 제2컷오프밸브(62) 사이에, ECU(80)의 제어하에 제1연료공급라인(60)을 개방하여 연료의 소통을 가능하게 하는 제1위치와 제1연료공급라인(60)을 외기와 연통시키는 제2위치로 동작하는 제1, 제2 외기유입용 전환밸브(141, 142)가 각각 설치되는 것을 특징으로 하는 가스엔진의 연료회수장치.The first fuel supply line 60 under the control of the ECU 80 between the first pressure sensor 131 and the first cutoff valve 61 and between the second pressure sensor 132 and the second cutoff valve 62. The first and second external air inlet switching valves 141 and 142 respectively operating to a first position for opening the fuel to enable communication of fuel and a second position for communicating the first fuel supply line 60 to the outside air, respectively. A fuel recovery device for a gas engine, characterized in that it is installed. 청구항 1 또는 청구항 2에 기재된 가스엔진의 연료회수장치를 이용하여 연료를 회수하는 방법으로서,A method for recovering fuel using a fuel recovery device of a gas engine according to claim 1 or 2, 연료긴급차단스위치(90)가 작동되거나 엔진이 정지하는 경우 제1컷오프밸브(61)와 제2컷오프밸브(62)를 닫는 과정;Closing the first cutoff valve 61 and the second cutoff valve 62 when the fuel emergency cutoff switch 90 is operated or the engine is stopped; 제1압력센서(131)와 제2압력센서(132)로부터 실시간으로 입력되는 센싱신호를 연산하여 단위시간당 압력강하값(ΔP1/Δt) 및 (ΔP2/Δt)을 산출하고, 산출된 값을 사전에 설정된 기준값과 비교하여 기준값 이상이 되면 제1연료공급라인(60)에 연료 누출이 있는 것으로 판단하여, 진공탱크 단속밸브(111)를 개방하여 진공회수탱크(110)의 진공압이 연료회수라인(100)에 작용하게 하는 과정; 및The pressure drop values ΔP 1 / Δt and ΔP 2 / Δt per unit time are calculated by calculating sensing signals input in real time from the first pressure sensor 131 and the second pressure sensor 132, and the calculated values are calculated. Is compared with a preset reference value, and when the reference value is greater than or equal to the first fuel supply line 60 determines that there is a fuel leak, the vacuum tank regulator valve 111 is opened to open the vacuum pressure of the vacuum recovery tank 110 to the fuel Acting on the recovery line 100; And 연료리턴밸브(120)를 제2위치로 전환하여 제1연료공급라인(60)과 연료회수라인(100)을 서로 연통하게 하여, 진공회수탱크(110)의 진공력이 제1연료공급라인(60)에 작용하도록 하여 제1연료공급라인(60)의 연료가 진공회수탱크(110)에 흡인되도록 하는 과정을 포함하는 것을 특징으로 하는 가스엔진의 연료회수방법.The fuel return valve 120 is switched to the second position so that the first fuel supply line 60 and the fuel recovery line 100 communicate with each other, so that the vacuum force of the vacuum recovery tank 110 is applied to the first fuel supply line ( And a process of allowing the fuel of the first fuel supply line (60) to be sucked into the vacuum recovery tank (110). 제3항에 있어서,The method of claim 3, 연료리턴밸브(120)를 제2위치로 전환한 이후, 제1외기유입용 전환밸브(141) 및 제2외기유입 전환밸브(142)를 제2위치로 전환하여 제1연료공급라인(60)에 외기가 작용하도록 하는 과정; 및After the fuel return valve 120 is switched to the second position, the first outside air inflow switching valve 141 and the second outside air inflow switching valve 142 are switched to the second position so that the first fuel supply line 60 is changed. Air to act on; And 상기 제1, 2외기유입용 전환밸브(141, 142)를 제2위치로 전환한 시점부터 타이머에 의해 경과시간을 검출하여 사전에 설정된 시간이 지나면 진공탱크 단속밸브(511)를 닫아 진공회수탱크(110)를 밀폐하는 과정을 더 수행하는 것을 특징으로 하는 가스엔진의 연료회수방법.The elapsed time is detected by a timer from the time when the first and second external air inlet switching valves 141 and 142 are switched to the second position, and when the predetermined time passes, the vacuum tank check valve 511 is closed to close the vacuum recovery tank. Fuel recovery method of the gas engine, characterized in that to further perform the process of sealing (110).
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KR20130066011A (en) * 2011-12-12 2013-06-20 현대자동차주식회사 Device for decreasing temperature of bombe by using latent heat in lpg vaporization and method thereof

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JP3966734B2 (en) 2002-02-04 2007-08-29 中央精機株式会社 Liquefied gas fuel supply system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130066011A (en) * 2011-12-12 2013-06-20 현대자동차주식회사 Device for decreasing temperature of bombe by using latent heat in lpg vaporization and method thereof
DE102012102840B4 (en) 2011-12-12 2021-09-02 Hyundai Motor Company Device and method for reducing the temperature of a pressure vessel by means of latent heat from liquefied petroleum gas (LPG) evaporation

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