KR20090032815A - Method for controlling igniting time of bi fuel car - Google Patents

Method for controlling igniting time of bi fuel car Download PDF

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Publication number
KR20090032815A
KR20090032815A KR1020070098345A KR20070098345A KR20090032815A KR 20090032815 A KR20090032815 A KR 20090032815A KR 1020070098345 A KR1020070098345 A KR 1020070098345A KR 20070098345 A KR20070098345 A KR 20070098345A KR 20090032815 A KR20090032815 A KR 20090032815A
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South Korea
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fuel
engine
gasoline
cng
full load
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KR1020070098345A
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Korean (ko)
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권윤성
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콘티넨탈 오토모티브 시스템 주식회사
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Priority to KR1020070098345A priority Critical patent/KR20090032815A/en
Publication of KR20090032815A publication Critical patent/KR20090032815A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—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 simultaneously using pluralities of fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
    • 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)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

A fuel conversion controlling method of a bi fuel vehicle operating an engine is provided to prevent engine torque from being lowered by operating an engine with gasoline fuel and CNG fuel in case the driving of full load condition is demanded in a CNG fuel mode. A fuel conversion controlling method of a bi fuel vehicle operating an engine comprises: a step(101,103) for receiving fuel conversion signals supplied from outside and determining whether present use fuel is gasoline fuel or not and converting the fuel mode into a CNG fuel mode in case the present use fuel is the gasoline fuel; a step(107) for determining driving demand of full load state according to acceleration will of a driver in the CNG fuel mode; and a step(109) for operating the engine with the gasoline fuel and the CNG fuel in case the driving demand of full load state is received.

Description

바이 퓨얼 차량의 연료 전환 제어 방법{METHOD FOR CONTROLLING IGNITING TIME OF BI FUEL CAR}How to control fuel switching in bi-fuel vehicles {METHOD FOR CONTROLLING IGNITING TIME OF BI FUEL CAR}

본 발명은 바이 퓨얼 차량의 연료 전환 제어 방법에 관한 것으로, 보다 상세하게는 연료 전환 시 발생하는 엔진 토크의 변화를 줄이기 위해 가솔린 연료와 가스 연료로 엔진을 구동할 수 있도록 한 방법에 관한 것이다.The present invention relates to a fuel switching control method of a bifuel vehicle, and more particularly, to a method for enabling the engine to be driven with gasoline fuel and gaseous fuel in order to reduce a change in engine torque generated during fuel switching.

일반적으로, 자동차에 사용되는 연료는 가솔린 또는 가스를 사용하며, 상호 장단점을 보완하기 위해 바이 퓨얼 차량에서는 가솔린과 가스를 겸용으로 사용하고 있다. 이때 가스 연료로는 압축 천연 가스인 씨엔지(CNG: Compressed Natural Gas) 또는 액화 석유 가스인 엘피지(LPG : Liquid Platum Gas)중 하나를 이용하고 있다. In general, the fuel used in automobiles is gasoline or gas, and bifuel vehicles use gasoline and gas to complement each other's advantages and disadvantages. At this time, one of the compressed gas is CNG (Compressed Natural Gas) or liquefied petroleum gas (LPG: Liquid Platum Gas).

이러한 바이 퓨얼 차량은 가솔린 엔진 제어유닛으로부터 공급되는 가솔린 인젝션 신호를 제공받아 인터페이스 유닛에서 가스 인젝션 신호를 발생하고, 이러한 가스 인젝션 신호에 따라 연료 탱크 내의 연료(LPG 또는 CNG)를 가스 인젝터에 공급하도록 구비된다. Such a bi-fuel vehicle is provided with a gasoline injection signal supplied from a gasoline engine control unit to generate a gas injection signal at the interface unit, and is provided to supply fuel (LPG or CNG) in the fuel tank to the gas injector according to the gas injection signal. do.

한편, 연료 탱크 내의 가솔린 연료는 가솔린 엔진 제어 유닛에서 발생하는 가솔린 인젝션 신호를 제공받아 가솔린 인젝터에 공급된다.Meanwhile, the gasoline fuel in the fuel tank is supplied to the gasoline injector by receiving a gasoline injection signal generated from the gasoline engine control unit.

이러한 바이 퓨얼 차량에 있어서, 사용 연료를 가스 연료를 이용하는 경우 통상 씨엔지 연료는 단위 질량당 50MJ/kg 의 에너지를 발생하고, 가솔린 연료는 단위 질량당 44 MJ/kg의 에너지를 발생한다. 그러나, 씨엔지 연료는 가스 상태이므로, 실제 실린더로 유입되는 연료량은 전체의 혼합 기체 중 대부분을 차지하므로, 실제 흡입 공기량이 감소하게 된다. 이로 인해 씨엔지 연료로만 엔진을 구동할 경우 단위 질량당 에너지량이 높음에도 불구하고, 실린더로 유입되는 흡입 공기량이 적어 불연소되는 연료량이 많아 엔진 출력이 감소한다. 특히 이러한 풀 부하 주행 시 엔진의 성능 및 승차감이 저하되는 문제점이 있었다.In such bifuel vehicles, when gas fuel is used as a fuel, CNENG fuel generates 50 MJ / kg of energy per unit mass, and gasoline fuel generates 44 MJ / kg of energy per unit mass. However, since the CNENG fuel is in a gas state, the actual amount of fuel flowing into the cylinder occupies most of the mixed gas, so that the actual amount of intake air is reduced. As a result, when the engine is driven only by CNENG fuel, although the amount of energy per unit mass is high, the amount of intake air flowing into the cylinder is small, so that the amount of unburned fuel is large and the engine output is reduced. In particular, there was a problem that the performance and riding comfort of the engine is reduced when driving the full load.

본 발명은 이와 같은 문제점을 해결하기 위해 창출된 것으로, 본 발명의 목적은 사용 연료를 씨엔지 연료로 전환되고 운전자의 가속 의지에 따라 풀 부하 상태의 주행 요구 시 가솔린 연료와 씨엔지 연료로 엔진을 구동함으로써, 유입되는 흡입 공기량 및 연소되는 연료량 감소로 인해 발생하는 엔진 토크 저하를 미연에 방지할 수 있는 바이 퓨얼 차량의 연료 전환 제어 방법을 제공하고자 함에 있다..The present invention has been made to solve the above problems, and an object of the present invention is to convert an engine fuel into a CNG fuel and to use the engine with gasoline fuel and CNG fuel when driving at full load is required according to the driver's willingness to accelerate. It is an object of the present invention to provide a fuel switching control method of a fuel vehicle that can prevent the engine torque decrease caused by the reduction of the amount of intake air and the amount of fuel burned.

상기 목적을 달성하기 위한 본 발명의 관점에 따른 바이 퓨얼 차량의 연료 전환 제어 방법은, Fuel conversion control method of a bi-fuel vehicle according to an aspect of the present invention for achieving the above object,

a) 외부로부터 공급되는 연료 전환 신호를 수신하여 현재 사용 연료가 가솔린 연료인 지를 판단하고 판단 결과 가솔린 연료인 경우 씨엔지 연료 모드로 전환하는 단계; a) determining whether the fuel currently used is gasoline fuel by receiving a fuel conversion signal supplied from the outside, and switching to CNENG fuel mode when the determination result is gasoline fuel;

b) 상기 a) 단계를 통해 씨엔지 연료 모드로 설정한 후 운전자의 가속 의지에 따라 풀 부하(full load) 상태의 주행 요구되었는 지를 판단하는 단계; 및b) determining whether driving in a full load state is requested according to the driver's acceleration will after setting to the CNG fuel mode through step a); And

c) 상기 b)단계에서 풀 부하 상태의 주행 요구 수신 시 가솔린 연료 및 씨엔지 연료로 엔진을 구동하는 단계를 포함한다.c) driving the engine with gasoline fuel and CNENG fuel when the driving request is received in the full load state in step b).

이상에서 설명한 바와 같이, 본 발명에 의하면, 사용 연료를 씨엔지 연료로 전환되고 운전자의 가속 의지에 따라 풀 부하 상태의 주행 요구 시 가솔린 연료와 씨엔지 연료로 엔진을 구동함으로써, 유입되는 흡입 공기량의 검소 및 불연소하는 연료량 증가로 인해 발생하는 엔진 토크 저하를 미연에 방지할 수 있는 효과를 얻는다.As described above, according to the present invention, the amount of intake air flowed in by converting the fuel used to the CNG fuel and driving the engine with the gasoline fuel and the CNG fuel when the driving demand of the full load condition is requested according to the driver's acceleration will. It is possible to prevent the engine torque drop caused by the increase in the amount of fuel to be inspected and burned out in advance.

이하 본 발명의 실시 예를 첨부된 도면에 의거하여 보다 상세하게 설명한다. 본 발명의 실시 예에서는 압축 천연 가스 연료인 씨엔지 연료와 가솔린 연료를 겸용으로 사용하는 바이 퓨얼 차량을 일례로 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In an embodiment of the present invention, a bi-fuel vehicle that uses CN fuel and gasoline fuel, which are compressed natural gas fuels, will be described as an example.

도 1은 본 발명에 적용되는 씨엔지 연료 및 가솔린 연료를 겸용으로 사용하는 바이 퓨얼 차량의 구성을 보인 도이다. 1 is a diagram showing the configuration of a bi-fuel vehicle using both CN fuel and gasoline fuel applied to the present invention.

도 1에 도시된 바와 같이, 본 발명에 따른 바이-퓨얼 차량의 씨엔지 연료에대한 내연 기관은, 가스 연료를 압축(CNG: Compressed Natural Gas) 상태로 저장하는 연료 탱크(1)와, 연료탱크(1)에 저장된 가스 연료가 유입되며 유입된 가스 연료의 압력을 임계값 이하의 감압된 압력으로 제어하여 토출하는 압력 조정기(30)와, 상기 압력 조정기(30)에서 압력 제어된 연료가 유입되면 유입된 연료를 엔진(3)의 부하상태에 따라 복수개, 예를 들면 5-10개의 솔레노이드에 의해 정량 제어된 후 엔진(3)의 흡기 다기관의 각각에 분배하는 연료 분배기(40)와, 연료 분배기(40)의 분배된 연료를 엔진 흡기 다기관의 연소실 내로 분사하는 가스 인젝터(노즐; Nozzle)(50)와, 엔진 회전수(RPM), 스로틀 위치 센서(TPS), 점화 타이밍, 매니폴드 절대 압력(MAP), 냉각수온, 압력 조정기(30) 내의 연료 온도, 산소 센서 각각의 신호 및 연료 분배기(40)의 적어도 2곳 이상에서의 압력 신호를 입력받아 이들 각각 의 신호를 토대로 연료분배기(40)의 복수개의 솔레노이드를 구동 제어하는 인터페이스 유닛(60)을 포함하여 구성된다. As shown in FIG. 1, the internal combustion engine for CNG fuel of a bi-fuel vehicle according to the present invention includes a fuel tank 1 for storing gas fuel in a compressed natural gas (CNG) state, and a fuel tank 1. When the gas fuel stored in (1) is introduced and the pressure-controlled fuel is introduced into the pressure regulator 30 for controlling and discharging the pressure of the introduced gas fuel to a reduced pressure below a threshold value, and the pressure-controlled fuel flows from the pressure regulator 30. A fuel distributor 40 which distributes the introduced fuel to each of the intake manifolds of the engine 3 after being quantitatively controlled by a plurality of, for example, 5-10 solenoids according to the load state of the engine 3, and a fuel distributor A gas injector (nozzle) 50 for injecting the dispensed fuel of 40 into the combustion chamber of the engine intake manifold, the engine speed RPM, the throttle position sensor TPS, the ignition timing, the manifold absolute pressure ( MAP), cooling water temperature, fuel in the pressure regulator 30 In addition, the interface unit 60 which receives the signals of each of the oxygen sensors and the pressure signals from at least two places of the fuel distributor 40 and drives the plurality of solenoids of the fuel distributor 40 based on each of these signals is provided. It is configured to include.

또한 본 발명에 따른 바이 퓨얼 차량에 있어 가솔린 연료에 관련 내연 기관은 이미 공지된 기술이므로 상세한 설명은 생략한다.In addition, since the internal combustion engine related to gasoline fuel in the bi-fuel vehicle according to the present invention is already known, a detailed description thereof will be omitted.

또한, 상기의 인터페이스 유닛(60)은 가솔린 연료에 관련 내연 기관을 제어하는 가솔린 엔진 제어 유닛(70)의 가솔린 인젝션 신호를 받아 가스 인젝션 신호로 변환하도록 구비된다.In addition, the interface unit 60 is provided to receive the gasoline injection signal of the gasoline engine control unit 70 for controlling the internal combustion engine related to the gasoline fuel and convert it into a gas injection signal.

이때 연료 탱크(1) 내의 압축된 가스 연료의 압력은 대략 200 ∼ 250bar 정도이며, 이 압력은 레귤레이터(미도시됨)를 거쳐 엔진에 공급되는 연료의 인젝션(injection)압력이 대략 2 ∼ 3bar까지 감압된다.At this time, the pressure of the compressed gaseous fuel in the fuel tank 1 is about 200 to 250 bar, and this pressure is reduced to about 2 to 3 bar by the injection pressure of the fuel supplied to the engine through a regulator (not shown). do.

그리고, 상기 가솔린 엔진 제어 유닛(70)은 사용 연료가 씨엔지 연료로 전환될 때 가솔린 연료와 씨엔지 연료로 엔진(3)을 구동하도록 구비된다. 따라서, 보 발명에서는, 사용 연소가 씨엔지 연료로 전환되고, 운전자에 가속 의지에 따라 풀 부하 상태의 주행 요구 시 가솔린 연료 및 씨엔지 연료로 엔진을 구동한다. In addition, the gasoline engine control unit 70 is provided to drive the engine 3 with gasoline fuel and the engine fuel when the fuel used is converted to the engine fuel. Therefore, in the present invention, the used combustion is switched to the CNG fuel, and the engine is driven by the gasoline fuel and the CNG fuel when the driver is required to accelerate and the driving is carried out in the full load state.

이를 보다 구체적으로 설명하기 위해 첨부되는 도면을 참조한다. 고, 도 2는 도 1에 도시된 가솔린 엔진 제어 유닛을 통해 연료 전환 제어 과정을 상세하게 설명하기 위한 흐름도이다.Reference to the accompanying drawings will be described in more detail. 2 is a flowchart illustrating a fuel switching control process in detail through the gasoline engine control unit illustrated in FIG. 1.

먼저, 단계(101)를 통해 외부로부터 공급되는 연료 전환 신호를 수신한 후 단계(103)로 진행하고 상기 단계(103)에서, 현재 사용 연료가 가솔린 연료인 지를 판단한다.First, after receiving the fuel change signal supplied from the outside through step 101, the process proceeds to step 103, and in step 103, it is determined whether the fuel currently used is gasoline fuel.

이어 상기 단계(103)의 판단 결과 가솔린 연료인 경우 단계(105)에서 씨엔지 연료 모드로 전환한 후 씨엔지 연료로 엔진을 구동하고, 단계(107)로 진행하고, 상기 단계(107)에서, 운전자의 가속 의지에 따라 엔진 풀 부하(full load) 상태의 주행 요구되었는 지를 판단한다.Subsequently, in the case of the gasoline fuel as a result of the determination of the step 103, after switching to the CNENG fuel mode in step 105, the engine is driven with the CNENG fuel, the process proceeds to step 107, and in the step 107, In accordance with the driver's willingness to accelerate, it is determined whether driving in an engine full load state is requested.

또한, 상기 단계(107)의 판단 결과 풀 부하 상태의 주행 요구 시 단계(109)로 진행하고, 상기 단계(109)는 가솔린 연료 및 씨엔지 연료로 엔진을 구동한다.In addition, the determination result of the step 107 proceeds to the step 109 when the driving request of the full load state, and the step 109 drives the engine with gasoline fuel and CN engine fuel.

이어 단계(111)를 통해 시동 스위치가 오프 위치로 설정되었는 지를 판단하고 판단 결과 시동 스위치가 오프 위치로 설정된 경우 본 프로그램을 종료하고, 시동 스위치가 오프되지 아니한 경우 상기 단계(101)로 진행한다.Subsequently, it is determined whether the start switch is set to the off position through step 111, and when the start switch is set to the off position, the program is terminated. If the start switch is not turned off, the process proceeds to step 101.

한편, 상기 단계(103)에서 현재 사용 연료가 가솔린 연료가 아닌 경우 단계(113)로 진행하고, 상기 단계(113)에서 가솔린 연료로 엔진을 구동한다On the other hand, if the current fuel is not a gasoline fuel in step 103, the process proceeds to step 113, and in step 113 the engine is driven with gasoline fuel.

이와 같이 본 발명이 속하는 기술 분야의 당업자는 본 발명의 그 기술적 사상이나 필수적 특징으로 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다. 그러므로, 이상에서 기술한 실시 예들은 모든 면에서 예시적인 것이며, 한정적인 것이 아닌 것으로서 이해해야만 한다. 본 발명의 범위는 상기 상세한 설명보다는 후술하는 특허 청구범위 의해 나타내어지며, 특허 청구범위의 의미 및 범위 그리고 그 등가 개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing to the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .

도 1은 본 발명이 적용되는 바이 퓨얼 차량의 구성을 나타낸 개략도이다.1 is a schematic view showing the configuration of a bi-fuel vehicle to which the present invention is applied.

도 2는 본 발명에 따른 연료 전환 제어 과정을 설명하기 위한 흐름도이다.2 is a flowchart illustrating a fuel switching control process according to the present invention.

Claims (1)

a) 외부로부터 공급되는 연료 전환 신호를 수신하여 현재 사용 연료가 가솔린 연료인 지를 판단하고 판단 결과 가솔린 연료인 경우 씨엔지 연료 모드로 전환하는 단계; a) determining whether the fuel currently used is gasoline fuel by receiving a fuel conversion signal supplied from the outside, and switching to CNENG fuel mode when the determination result is gasoline fuel; b) 상기 a) 단계를 통해 씨엔지 연료 모드로 설정한 후 운전자의 가속 의지에 따라 풀 부하(full load) 상태의 주행 요구되었는 지를 판단하는 단계; 및b) determining whether driving in a full load state is requested according to the driver's acceleration will after setting to the CNG fuel mode through step a); And c) 상기 b)단계에서 풀 부하 상태의 주행 요구 수신 시 가솔린 연료 및 씨엔지 연료로 엔진을 구동하는 단계를 포함하는 것을 특징으로 하는 바이 퓨얼 차량의 연료 전환 제어 방법.and c) driving the engine with gasoline fuel and CNENG fuel when the driving request in the full load state is received in step b).
KR1020070098345A 2007-09-28 2007-09-28 Method for controlling igniting time of bi fuel car KR20090032815A (en)

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