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KR20080032948A - Diesel and Diesel Pilot Natural Gas Bifuel Combustion Systems in Diesel Engines - Google Patents

Diesel and Diesel Pilot Natural Gas Bifuel Combustion Systems in Diesel Engines Download PDF

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KR20080032948A
KR20080032948A KR1020060099194A KR20060099194A KR20080032948A KR 20080032948 A KR20080032948 A KR 20080032948A KR 1020060099194 A KR1020060099194 A KR 1020060099194A KR 20060099194 A KR20060099194 A KR 20060099194A KR 20080032948 A KR20080032948 A KR 20080032948A
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diesel
natural gas
combustion system
fuel
pilot
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표영덕
이영재
김강출
우영민
권오석
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한국에너지기술연구원
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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
    • F02D19/08—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
    • F02D19/10—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 peculiar to compression-ignition engines in which the main fuel is gaseous
    • 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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/403—Multiple injections with pilot injections
    • 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
    • F02M21/0248—Injectors
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

본 발명은 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템에 관한 것으로서, 더욱 상세하게는 디젤엔진에 천연가스를 연료로 직접 사용하게 되면 이상연소의 원인이 되므로 실제로 엔진의 정상적인 운전을 위해서는 압축비를 낮추고 스파크 점화방식을 적용해야 하며 이 때문에 현재 적용되고 있는 스파크 점화방식의 천연가스 전소엔진은 압축착화 방식의 디젤엔진에 비해 일반 운전조건에서 출력 및 효율이 낮아지고 엔진의 방열손실이 증가하는 단점이 있어, 기존의 직접분사 디젤기관에 대하여 압축비를 그대로 사용하면서 점화플러그 대신 경유를 소량 파일럿 분사하고 주 연료인 천연가스연료를 흡기포트로 공급하여, 개조비용의 큰 증가 없이 Soot와 NOx를 최소화여 청정성을 향상시키고 높은 압축비의 장점을 살려 디젤엔진 수준의 출력 및 효율을 얻고자, 디젤엔진에 디젤과 디젤파일럿 천연가스연료를 병용하여 사용하기 위한 특징이 있다.The present invention relates to a diesel and diesel pilot natural gas bifuel combustion system of a diesel engine, and more particularly, the use of natural gas as a fuel directly in a diesel engine causes abnormal combustion. This is because spark ignition type natural gas burner engine has low output and efficiency under normal operating conditions and increases heat dissipation loss of engine compared to compression ignition type diesel engine. With the same compression ratio as for conventional direct injection diesel engines, a small pilot injection of diesel oil is used instead of the spark plug and the natural gas fuel, which is the main fuel, is supplied to the intake port, minimizing soot and NO x without a significant increase in retrofit costs. To improve cleanliness and take advantage of high compression ratios In order to obtain the output and efficiency of the diesel engine, there is a characteristic for using diesel and diesel pilot natural gas fuel in combination.

Description

디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템{Diesel and Diesel Pilot Natural Gas Bi-Fuel System of Diesel Engine}Diesel and Diesel Pilot Natural Gas Bi-Fuel System of Diesel Engine

도 1은 본 발명의 일실시예에 따른 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템을 나타낸 구성도이다.1 is a block diagram showing a diesel and diesel pilot natural gas bifuel combustion system of a diesel engine according to an embodiment of the present invention.

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

10 : 디젤연료탱크 11 : 연료공급펌프10: diesel fuel tank 11: fuel supply pump

12 : EUI인젝터 13 : 디젤제어장치12: EUI injector 13: diesel control device

20 : CNG연료탱크 21 : 레큘레이터20: CNG fuel tank 21: recurator

22 : CNG인젝터 23 : 천연가스제어장치22: CNG injector 23: natural gas control device

30 : 디젤엔진 31 : 흡기포트30: diesel engine 31: intake port

40 : 캠센서 50 : RPM센서40: Cam sensor 50: RPM sensor

60 : 페달센서 61 : 페달캠장치60: pedal sensor 61: pedal cam device

70 : MAP센서 80 : 디젤/디젤파일럿 선택스위치70: MAP sensor 80: Diesel / diesel pilot selection switch

100 : 디젤연료 연소시스템100: diesel fuel combustion system

200 : 천연가스 연소시스템200: natural gas combustion system

300 : 디젤파일럿 천연가스 연소시스템300: diesel pilot natural gas combustion system

본 발명은 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템에 관한 것으로서, 더욱 상세하게는 디젤엔진에 천연가스를 연료로 직접 사용하게 되면 이상연소의 원인이 되므로 실제로 엔진의 정상적인 운전을 위해서는 압축비를 낮추고 스파크 점화방식을 적용해야 하며 이 때문에 현재 적용되고 있는 스파크 점화방식의 천연가스 전소엔진은 압축착화 방식의 디젤엔진에 비해 일반 운전조건에서 출력 및 효율이 낮아지고 엔진의 방열손실이 증가하는 단점이 있어, 기존의 직접분사 디젤기관에 대하여 압축비를 그대로 사용하면서 점화플러그 대신 경유를 소량 파일럿 분사하고 주 연료인 천연가스연료를 흡기포트로 공급하여, 개조비용의 큰 증가 없이 Soot와 NOx를 최소화여 청정성을 향상시키고 높은 압축비의 장점을 살려 디젤엔진 수준의 출력 및 효율을 얻고자, 디젤엔진에 디젤과 디젤파일럿 천연가스연료를 병용하여 사용하기 위한 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템에 관한 것이다.The present invention relates to a diesel and diesel pilot natural gas bifuel combustion system of a diesel engine, and more particularly, the use of natural gas as a fuel directly in a diesel engine causes abnormal combustion. This is because spark ignition type natural gas burner engine has low output and efficiency under normal operating conditions and increases heat dissipation loss of engine compared to compression ignition type diesel engine. With the same compression ratio as for conventional direct injection diesel engines, a small pilot injection of diesel oil is used instead of the spark plug and the natural gas fuel, which is the main fuel, is supplied to the intake port, minimizing soot and NO x without a significant increase in retrofit costs. To improve cleanliness and take advantage of high compression ratios The present invention relates to a diesel engine and a diesel pilot natural gas bifuel combustion system of a diesel engine for use in combination of a diesel engine and a diesel pilot natural gas fuel in a diesel engine.

일반적으로, 에너지의 대부분을 수입에 의존하고 있는 우리나라로서는 한정된 에너지 자원의 효율적 이용이 매우 중요한 과제이고 세계의 지구환경보전과도 직결되는 문제이다. 천연가스는 세계 각지에 사용가능한 많은 량이 매장되어있고 가격이 저렴하여 자동차의 청정 대체연료로서 각광을 받고 있다.In general, the efficient use of limited energy resources is a very important task for Korea, which relies on imports for the majority of its energy, and is directly connected to the global environmental conservation. Natural gas is in the spotlight as a clean alternative fuel for automobiles due to its large amount of available and low price.

여기서, 디젤엔진은 가솔린엔진보다 에너지 소비효율이 우수하고 지구 온난화 가스인 CO2(이산화탄소)의 배출이 적은 장점이 있다. Here, the diesel engine has the advantages of better energy consumption efficiency than the gasoline engine and less emissions of global warming gas CO 2 (carbon dioxide).

그러나, 상기 디젤엔진은 PM(입자상 물질)과 NOx(질소산화물)의 배출량이 많은 단점이 있다. 이에 디젤엔진의 저공해 대체연료로서 천연가스의 적용이 활발히 추진되고 있으나, 천연가스 전소엔진은 세탄가가 낮아서 스파크 점화방식의 오토싸이클(Otto Cycle) 엔진으로 개조해야하기 때문에 디젤엔진에 비해 에너지 소비효율이 감소하고 연료자체의 에너지밀도가 낮아 운행거리가 크게 감소하며 연료공급 인프라를 새로이 구축해야 하는 등 많은 문제점이 있다.However, the diesel engine has a disadvantage in that the emissions of PM (particulate matter) and NOx (nitrogen oxide) are large. Natural gas is being actively applied as a low-pollution alternative fuel for diesel engines.However, natural gas burner engines have a lower cetane value and must be converted to a spark ignition type Otto Cycle engine. There are many problems, such as a reduction in the energy density of the fuel itself, a significant reduction in the mileage, and a new fuel supply infrastructure.

따라서, 이를 해결하기 위해 기존의 직접분사 디젤기관에 대하여 압축비를 그대로 사용하면서 점화플러그 대신 경유를 소량 파일럿 분사하여 압축착화 시키는 새로운 방식이 연구되고 있으며, 이러한 방식의 디젤파일럿 천연가스 연소시스템(이를 천연가스/경유 듀얼퓨얼 연소시스템이라고도 함)은 개조비용의 큰 증가 없이 Soot와 NOx를 최소화하면서 높은 압축비의 장점을 살려 디젤엔진 수준의 출력 및 효율을 얻을 수 있는 장점이 있다. 또한 천연가스를 대부분 사용하면서 소량의 액상 경유만을 함께 사용하므로 경제적이고 깨끗한 연소를 위한 하나의 해답이 될 수 있다.Therefore, in order to solve this problem, a new method of compressing and igniting a small amount of diesel fuel injection instead of a spark plug while using the compression ratio of the existing direct injection diesel engine is being studied. The gas / diesel dual fuel combustion system) also has the advantage of achieving high diesel engine output and efficiency while taking advantage of the high compression ratio while minimizing soot and NO x without significantly increasing retrofit costs. In addition, since only a small amount of liquid diesel is used together with most of natural gas, it may be an answer for economical and clean combustion.

따라서, 본 발명은 상기 종래의 문제점을 해소하기 위해 안출된 것으로,Accordingly, the present invention has been made to solve the above conventional problems,

기존의 디젤연료 사용시에는 디젤연료탱크로부터 EUI 인젝터로 공급시켜 인젝터에 의해 엔진에 분사되는 EUI 방식의 디젤연료 연소시스템을 그대로 사용하고, 또 디젤파일럿 천연가스 사용시에는 상기 디젤연료 연소시스템과 페달캠장치를 적용하여 파일럿연료로 디젤을 일정하게 소량 사용하면서 별도의 천연가스 연료공급시스템을 장착하여 주 연료인 천연가스가 공급되도록 하고자 한다.When using the existing diesel fuel, the diesel fuel combustion system of the EUI type that is supplied from the diesel fuel tank to the EUI injector and injected into the engine by the injector is used as it is, and when the diesel pilot natural gas is used, the diesel fuel combustion system and the pedal cam device By using this method, a small amount of diesel is used as a pilot fuel while a separate natural gas fuel supply system is installed to supply natural gas as a main fuel.

또한, 최근 일부 연구에서는 기존의 디젤전용 EUI 연료공급시스템 외에 디젤파일럿 연료와 천연가스 연료를 함께 제어하기 위한 통합 연료공급시스템을 개발하고 있으나, 기존에 장착된 EUI 인젝터를 정확하게 제어하기가 어렵고 그 구조가 복잡하며 제작비가 고가이나, 본 발명은 구조가 매우 간단하여 제작이 용이하고 제작비가 저렴하다.In addition, recently, some studies have developed an integrated fuel supply system for controlling diesel pilot fuel and natural gas fuel in addition to the conventional diesel EUI fuel supply system, but it is difficult to accurately control the existing EUI injector and its structure Is complicated and expensive to manufacture, the present invention is very simple in structure and easy to manufacture and low production cost.

즉, 기존의 디젤연료 사용시에는 디젤을 디젤연료탱크로부터 연료분사펌프와 인젝터가 일체형으로 결합된 구조가 특징인 EUI 인젝터로 공급시켜 인젝터에 의해 엔진에 분사되는 디젤연료 연소시스템을 그대로 사용하며, 또한, 디젤파일럿 천연가스 사용시에는 디젤/디젤파일럿 선택스위치를 전환하여 디젤파일럿 연료는 상기 디젤연료 연소시스템과 함께 운전 중에 디젤엔진을 점화시키기 위해 필요한 최소량의 디젤연료를 일정하게 분사시키는 역할을 하는 페달캠장치를 적용하여 공급하면서 주 연료인 천연가스는 기존 엔진에 부착된 일부 센서를 공동 활용하여 별도의 천연가스 연료공급시스템에 의해 공급되는 것을 목적으로 한다.That is, when using conventional diesel fuel, diesel is supplied from the diesel fuel tank to the EUI injector, which is characterized by a combination of the fuel injection pump and the injector, and the diesel fuel combustion system injected into the engine by the injector is used as it is. When using diesel pilot natural gas, the diesel / diesel pilot selector switch is switched so that the diesel pilot fuel, along with the diesel fuel combustion system, constantly injects the minimum amount of diesel fuel required to ignite the diesel engine during operation. The main fuel, natural gas, is supplied by a separate natural gas fuel supply system by jointly utilizing some sensors attached to an existing engine while supplying the device.

본 발명은 상기의 목적을 달성하기 위해 아래와 같은 특징을 갖는다.The present invention has the following features to achieve the above object.

본 발명은 자동차 연료공급 시스템에 있어서, 기존의 디젤연료를 연소시키는 디젤연료 연소시스템과; 초기점화용 연료는 기존의 디젤연료 연소시스템에 의해 디젤연료를 일정량 사용하고, 주연료는 천연가스 연소시스템에 의해 천연가스연료를 연소시키는 디젤파일럿 천연가스(CNG) 연소시스템; 중 어느 한 시스템을 선택적으로 사용하는 것을 특징으로 한다.The present invention provides an automobile fuel supply system, comprising: a diesel fuel combustion system for burning an existing diesel fuel; The initial ignition fuel uses a certain amount of diesel fuel by the existing diesel fuel combustion system, the main fuel is a diesel pilot natural gas (CNG) combustion system for burning the natural gas fuel by the natural gas combustion system; It is characterized by selectively using any one of the systems.

그리고, 본 발명의 상기 디젤연료 연소시스템은 디젤연료탱크에서 연료공급펌프에 의해 EUI인젝터(Electri Unit Injector)를 통해 디젤연료가 직접적으로 디젤엔진 실린더에 분사되고, 상기 디젤파일럿 천연가스 연소시스템은 초기점화를 위해 필요한 최소량의 디젤연료가 기존의 디젤연료 연소시스템과 페달캠장치에 의해 디젤엔진에 일정하게 분사되고, 주 연료인 천연가스(CNG연료)가 천연가스 연소시스템에 의해 CNG연료탱크에서 레큘레이터에 의해 CNG인젝터를 통해 디젤엔진의 실린더와 연통된 흡기포트에 분사되며, 이와 같이 선택적으로 디젤파일럿 천연가스 연소시스템을 사용시, 상기 초기점화를 위해 분사되는 디젤연료의 분사량은 디젤연료 연소시스템을 선택하여 디젤연료만 사용하는 경우와 비교하여 1 ~ 5%정도만 분사하여 디젤엔진의 점화만 시키는 특징으로 한다.In the diesel fuel combustion system of the present invention, a diesel fuel is directly injected into a diesel engine cylinder through an EUI injector (Electri Unit Injector) by a fuel supply pump in a diesel fuel tank, and the diesel pilot natural gas combustion system is The minimum amount of diesel fuel required for ignition is uniformly injected into the diesel engine by the existing diesel fuel combustion system and the pedal cam device, and natural gas (CNG fuel), the main fuel, is recycled in the CNG fuel tank by the natural gas combustion system. Injectors are injected into the intake port communicating with the cylinders of the diesel engine by the CNG injector.In this case, when the diesel pilot natural gas combustion system is selectively used, the injection amount of the diesel fuel injected for the initial ignition is controlled by the diesel fuel combustion system. When ignition of diesel engine only by spraying about 1 ~ 5% compared to the case of using only diesel fuel The key features.

또한, 본 발명의 상기 디젤연료 연소시스템의 EUI인젝터는 차량 내부에 형성된 디젤제어장치에 의해 제어되고, 상기 디젤파일럿 천연가스 연소시스템을 선택하여 천연가스 연소시스템에 의해 천연가스를 공급할 때의 CNG인젝터는 차량 내부에 형성된 천연가스제어장치에 의해 제어되고, 상기 디젤연료 연소시스템과 천연가스 연소시스템에는 캠센서와, RPM센서와, 페달센서와, MAP센서가 형성되어 각각의 센서에서 측정된 신호를 상호 연계된 상기 디젤제어장치와 천연가스제어장치에 전달되며, 상기 페달센서의 일단부에는 디젤을 선택하여 기존의 디젤연료 연소시스템만을 사용하는 경우에는 작동을 하지 않고, 디젤파일럿 천연가스 연소시스템을 선택하여 사용할 때 운전자가 가속페달을 작동시키면 디젤연료 연소시스템에서 점화를 위해 필요한 최소량의 디젤연료를 일정하게 분사시키는 역할을 하는 페달캠장치가 설치되는 특징으로 한다.In addition, the EUI injector of the diesel fuel combustion system of the present invention is controlled by a diesel control device formed inside the vehicle, CNG injector when selecting the diesel pilot natural gas combustion system to supply natural gas by the natural gas combustion system Is controlled by a natural gas control device formed inside the vehicle, and the cam fuel, the RPM sensor, the pedal sensor, and the MAP sensor are formed in the diesel fuel combustion system and the natural gas combustion system to measure the signals measured by the respective sensors. The diesel control unit and the natural gas control unit are connected to each other, and when one of the pedal sensors is selected with diesel, the diesel pilot natural gas combustion system is not operated when only the existing diesel fuel combustion system is used. When selected and used, the operator activates the accelerator pedal so that the maximum required for ignition in the diesel fuel combustion system is required. It is characterized in that the pedal cam device that serves to uniformly inject a small amount of diesel fuel is installed.

이와 같은 특징을 갖는 본 발명은 그에 따른 바람직한 실시예를 통해 더욱 명확히 설명될 수 있을 것이다.The present invention having such a feature will be more clearly described through the preferred embodiment accordingly.

이하, 본 발명의 바람직한 실시예를 첨부된 도면과 더불어 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with the accompanying drawings.

도 1은 본 발명의 일실시예에 따른 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템을 나타낸 구성도이다.1 is a block diagram showing a diesel and diesel pilot natural gas bifuel combustion system of a diesel engine according to an embodiment of the present invention.

도시한 바와 같이, 본 발명의 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템는 대형차량 즉, 대형버스나 대형트럭에 사용되는 것으로 기존의 디젤연료를 연소시키는 디젤연료 연소시스템(100)과, 초기점화를 위해 필요한 최소량의 디젤연료 공급은 상기 디젤연료 연소시스템(100)을 사용하고 주 연료는 천연가스 연소시스템(200)에 의해 천연가스연료(CNG)를 사용하는 디젤파일럿 천연가스 연소시스템(300) 중 어느 한 시스템을 선택적으로 사용하는 구성이다.As shown, the diesel and diesel pilot natural gas bifuel combustion system of the diesel engine of the present invention is used in a large vehicle, that is, a large bus or a large truck diesel fuel combustion system 100 for burning conventional diesel fuel, The minimum amount of diesel fuel required for initial ignition uses the diesel fuel combustion system 100 and the main fuel uses a natural gas fuel (CNG) by the natural gas combustion system 200. It is a configuration to selectively use any one of the 300).

상기 디젤연료 연소시스템(100)은 디젤연료탱크(10)에서 디젤연료(Diesel)가 공급펌프(11)에 의해 이송되어 각각의 실린더마다 독립적으로 설치된 EUI인젝터(Electric Unit Injector, 12)를 통해 디젤엔진(30)의 실린더 내부에 직접적으로 디젤연료가 분사되어 엔진이 압축착화 된다.The diesel fuel combustion system 100 is a diesel fuel (Diesel) in the diesel fuel tank (10) is transferred by the supply pump 11 through the EUI injector (Electric Unit Injector, 12) installed independently for each cylinder Diesel fuel is injected directly into the cylinder of the engine 30, the engine is compressed and ignited.

여기서, 상기 EUI인젝터(Electri Unit Injector, 12)는 인젝터와 연료분사펌프가 일체형으로 결합된 것으로 기존에는 하나의 연료분사펌프에 엔진의 실린더 수에 해당하는 다수개의 인젝터가 연통되어 연료를 분사했는데, 상기 EUI인젝터(12)는 인젝터와 연료공급펌프가 일체형으로 엔진의 실린더 한 개당 하나씩 독립적으로 설치되어 대형버스 등 대형차량에 유용하게 사용되고 있다.Here, the EUI injector (Electri Unit Injector, 12) is an injector and a fuel injection pump is integrally coupled to the conventional injection of a plurality of injectors corresponding to the number of cylinders of the engine to one fuel injection pump injecting fuel, The EUI injector 12 is an injector and a fuel supply pump are integrally installed one by one per cylinder of the engine is used effectively for large vehicles such as large buses.

상기 디젤파일럿 천연가스 연소시스템(300)은 기존 디젤연료 연소시스템(100)을 통해 디젤연료가 디젤엔진(30)의 초기점화를 위해 일정량 분사되고, 천연가스 연소시스템(200)을 통해 CNG연료(천연가스)가 CNG연료탱크(20)에서 레큘레이터(21)를 거쳐 디젤엔진(30)의 실린더와 연통된 흡기포트(31)에 형성된 CNG인젝터(22)를 통해 천연가스연료가 분사된다.The diesel pilot natural gas combustion system 300 is a certain amount of diesel fuel is injected through the existing diesel fuel combustion system 100 for the initial ignition of the diesel engine 30, CNG fuel (through the natural gas combustion system 200) Natural gas) is injected through the CNG injector 22 formed in the intake port 31 in communication with the cylinder of the diesel engine 30 via the recirculator 21 in the CNG fuel tank 20.

여기서, 상기 천연가스 연소시스템(200)은 디젤엔진(30)의 점화를 위하여 기존의 디젤연료 연소시스템(100)을 천연가스 연소시스템(200)과 함께 병용하여 사용하는데, 이때, 상기 초기점화를 위해 사용되는 디젤연료 연소시스템(100)에 의해 분사되는 디젤연료의 분사량은 전체 디젤연료만 분사하는 경우의 1 ~ 5%정도만 분사되고 나머지 주 연료는 천연가스가 공급되어 연소된다. Here, the natural gas combustion system 200 uses an existing diesel fuel combustion system 100 together with the natural gas combustion system 200 to ignite the diesel engine 30, wherein the initial ignition The injection amount of the diesel fuel injected by the diesel fuel combustion system 100 used for the injection is only about 1 to 5% of the case of injecting only the entire diesel fuel and the remaining main fuel is combusted by supplying natural gas.

이때, 상기 디젤연료 연소시스템(100)의 EUI인젝터(12)는 차량 내부에 형성된 디젤제어장치(Diesel ECU, 13)에 의해 제어되는데 상기 디젤연료 연소시스 템(100)에 형성된 캠센서(40)와, RPM센서(50)와, 페달 캠(61)와, MAP센서(70) 등으로부터 측정된 신호를 전달받아 EUI인젝터(12)를 작동시켜 디젤연료가 디젤엔진(30)에 분사되도록 하는 것이다.At this time, the EUI injector 12 of the diesel fuel combustion system 100 is controlled by a diesel control device (Diesel ECU, 13) formed inside the vehicle cam sensor 40 formed in the diesel fuel combustion system 100 And, by receiving the signals measured from the RPM sensor 50, the pedal cam 61, the MAP sensor 70 and the like to operate the EUI injector 12 so that the diesel fuel is injected into the diesel engine (30). .

그리고, 상기 천연가스 연소시스템(200)의 CNG인젝터(22)는 차량 내부에 형성된 천연가스제어장치(CNG ECU, 23)에 의해 제어되는데 상기 디젤연료 연소시스템(100)과 병용하여 천연가스 연소시스템(200)에 형성된 캠센서(40)와, RPM센서(50)와, 페달센서(60)와, MAP센서(70) 등으로부터 측정된 신호를 전달받아 CNG인젝터(22)를 작동시켜 천연가스연료가 흡기포트(31)에 분사되도록 하는 것이다.In addition, the CNG injector 22 of the natural gas combustion system 200 is controlled by a natural gas control device (CNG ECU) 23 formed in a vehicle, which is combined with the diesel fuel combustion system 100 to produce a natural gas combustion system. The gas sensor 40, the RPM sensor 50, the pedal sensor 60, the MAP sensor 70 and the like received the signals received from the cam sensor 40 is operated to operate the natural gas fuel 22 Is to be injected into the intake port (31).

이렇듯, 상기 캠센서(40)와, RPM센서(50)와, 페달센서(60)와, MAP센서(70) 등은 상기 디젤제어장치(Diesel ECU, 13)와 천연가스제어장치(CNG ECU, 23)에 상호 연계되어 측정된 신호를 상기 디젤연료 연소시스템(100)과 디젤파일럿 천연가스 바이퓨얼 연소시스템을 선택적으로 사용함에 따라 사용되는 시스템의 제어장치에 전달된다.As such, the cam sensor 40, the RPM sensor 50, the pedal sensor 60, the MAP sensor 70 and the like are the diesel controller (Diesel ECU, 13) and natural gas controller (CNG ECU, 23, the signals measured in cooperation with each other are transmitted to the control device of the system used by selectively using the diesel fuel combustion system 100 and the diesel pilot natural gas bifuel combustion system.

여기서, 상기 디젤연료 연소시스템(100)과 천연가스 연소시스템(200)을 선택적으로 사용하기 위해 디젤/디젤파일럿 선택스위치(Select Switch, 80)를 형성하고, 상기 선택스위치(80)는 상기 페달센서(60)에서 측정된 신호를 전달받아 상기 디젤제어장치(13)와 천연가스제어장치(23)에 신호를 전달하여 상기 디젤연료 연소시스템(100)과 천연가스 연소시스템(200)을 선택적으로 사용할 수 있다.Here, a diesel / diesel pilot select switch (80) is formed to selectively use the diesel fuel combustion system (100) and the natural gas combustion system (200), and the select switch (80) is the pedal sensor. Receive the signal measured in 60 to transmit the signal to the diesel control device 13 and the natural gas control device 23 to selectively use the diesel fuel combustion system 100 and natural gas combustion system 200. Can be.

그리고, 상기 페달센서(60)의 일단부에는 페달 캠 장치(61)가 일체형으로 설치되어 디젤/디젤파일럿 선택스위치(Select Switch, 80)에 의해 디젤을 선택하여 기존 디젤연료 연소시스템(100)만을 사용하는 경우에는 작동을 하지 않으며, 디젤파일럿 천연가스 연소시스템(300)을 선택하여 사용할 때에 운전자가 가속페달을 작동시키면 운전 중에 디젤엔진(30)을 점화시키기 위해 필요한 최소량의 디젤연료를 일정하게 분사시키는 역할을 한다.In addition, the pedal cam device 61 is integrally installed at one end of the pedal sensor 60 to select diesel by a diesel / diesel pilot selection switch (Select Switch) 80 so that only the existing diesel fuel combustion system 100 is used. When the diesel pilot natural gas combustion system 300 is selected and used, if the driver activates the accelerator pedal, the minimum amount of diesel fuel required to ignite the diesel engine 30 during operation is uniformly injected. It plays a role.

이상에서 살펴 본 바와 같이, 본 발명의 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템은 디젤전용 EUI 연료공급시스템 외에 디젤파일럿 연료와 천연가스 연료를 함께 제어하기 위한 통합제어 연료공급시스템을 제작하여 적용하는 것보다 기존에 장착된 EUI 시스템을 그대로 적용함에 따라 EUI 인젝터를 정확하게 제어할 수 있고 구조가 매우 간단하여 제작이 용이하고 제작비가 저렴한 효과가 있다.As described above, the diesel and diesel pilot natural gas bifuel combustion systems of the diesel engine of the present invention produce an integrated control fuel supply system for controlling diesel pilot fuel and natural gas fuel in addition to the diesel-only EUI fuel supply system. As the existing EUI system is applied as it is, the EUI injector can be precisely controlled and its structure is very simple, making it easy to manufacture and low cost.

Claims (8)

자동차 연료공급 시스템에 있어서,In the automotive fuel supply system, 기존의 디젤연료를 연소시키는 디젤연료 연소시스템(100)과;A diesel fuel combustion system 100 for burning existing diesel fuel; 초기점화용 연료는 기존의 디젤연료 연소시스템(100)에 의해 디젤연료를 일정량 사용하고, 주연료는 천연가스 연소시스템(200)에 의해 천연가스연료를 연소시키는 디젤파일럿 천연가스(CNG) 연소시스템(300);The initial ignition fuel uses a certain amount of diesel fuel by the existing diesel fuel combustion system 100, and the main fuel is a diesel pilot natural gas (CNG) combustion system that burns natural gas fuel by the natural gas combustion system 200. 300; 중 어느 한 시스템을 선택적으로 사용하는 것을 특징으로 하는 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.A diesel and diesel pilot natural gas bifuel combustion system of a diesel engine, characterized by selectively using either system. 제 1항에 있어서,The method of claim 1, 상기 디젤연료 연소시스템(100)은 디젤연료탱크(10)에서 연료공급펌프(11)에 의해 EUI인젝터(Electri Unit Injector, 12)를 통해 디젤연료가 직접적으로 디젤엔진(30)의 실린더에 분사되는 것을 특징으로 하는 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.The diesel fuel combustion system 100 is a diesel fuel is injected directly into the cylinder of the diesel engine 30 through the EUI injector (Electri Unit Injector, 12) by the fuel supply pump 11 in the diesel fuel tank (10). Diesel and diesel pilot natural gas bifuel combustion system of a diesel engine, characterized in that. 제 1항에 있어서,The method of claim 1, 상기 디젤파일럿 천연가스 연소시스템(300)은 초기점화를 위해 필요한 최소 량의 디젤연료가 기존의 디젤연료 연소시스템(100)과 페달캠장치(61)에 의해 디젤엔진(30)에 일정하게 분사되고, 주 연료인 천연가스(CNG연료)가 천연가스 연소시스템(200)에 의해 CNG연료탱크(20)에서 레큘레이터(21)에 의해 CNG인젝터(22)를 통해 디젤엔진(30)의 실린더와 연통된 흡기포트(31)에 분사되는 것을 특징으로 하는 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.The diesel pilot natural gas combustion system 300 is a minimum amount of diesel fuel required for the initial ignition is uniformly injected to the diesel engine 30 by the existing diesel fuel combustion system 100 and the pedal cam device 61. , The main fuel natural gas (CNG fuel) is in communication with the cylinder of the diesel engine 30 through the CNG injector 22 by the recirculator 21 in the CNG fuel tank 20 by the natural gas combustion system 200 Diesel and diesel pilot natural gas bifuel combustion system of the diesel engine, characterized in that the injection to the intake port 31. 제 1항 또는 제 3항에 있어서,The method according to claim 1 or 3, 선택적으로 디젤파일럿 천연가스 연소시스템(300)을 사용시,Optionally using a diesel pilot natural gas combustion system (300), 상기 초기점화를 위해 분사되는 디젤연료의 분사량은 디젤연료 연소시스템(100)을 선택하여 디젤연료만 사용하는 경우와 비교하여 1 ~ 5%정도만 분사하여 디젤엔진(30)의 점화만 시키는 것을 특징으로 하는 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.The injection amount of the diesel fuel injected for the initial ignition is to select only the diesel fuel combustion system 100 to inject only about 1 to 5% compared to the case of using only diesel fuel, characterized in that only the ignition of the diesel engine (30) Diesel and diesel pilot natural gas bifuel combustion systems. 제 1항에 있어서,The method of claim 1, 상기 디젤연료 연소시스템(100)의 EUI인젝터(12)는 차량 내부에 형성된 디젤제어장치(13)에 의해 제어되고, 상기 디젤파일럿 천연가스 연소시스템(300)을 선택하여 천연가스 연소시스템(200)에 의해 천연가스를 공급할 때의 CNG인젝터(22)는 차량 내부에 형성된 천연가스제어장치(23)에 의해 제어되는 것을 특징으로 하는 디 젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.The EUI injector 12 of the diesel fuel combustion system 100 is controlled by the diesel control device 13 formed inside the vehicle, and the diesel pilot natural gas combustion system 300 is selected to select the natural gas combustion system 200. CNG injector 22 when supplying natural gas is controlled by a natural gas control device 23 formed in the vehicle diesel and diesel pilot natural gas bifuel combustion system, characterized in that. 제 5항에 있어서,The method of claim 5, 상기 디젤연료 연소시스템(100)과 천연가스 연소시스템(200)에는 캠센서(40)와, RPM센서(50)와, 페달센서(60)와, MAP센서(70)가 형성되어 각각의 센서에서 측정된 신호를 상호 연계된 상기 디젤제어장치(13)와 천연가스제어장치(23)에 전달되는 것을 특징으로 하는 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.In the diesel fuel combustion system 100 and the natural gas combustion system 200, a cam sensor 40, an RPM sensor 50, a pedal sensor 60, and a MAP sensor 70 are formed in each sensor. The diesel and diesel pilot natural gas bi-fuel combustion system of the diesel engine, characterized in that the measured signal is transmitted to the diesel control device 13 and the natural gas control device 23 interrelated with each other. 제 6항에 있어서,The method of claim 6, 상기 페달센서(60)는 디젤연료 연소시스템(100)과 천연가스 연소시스템(200)을 선택적으로 작동시키도록 형성된 디젤/디젤파일럿 선택스위치(80)에 신호를 보내고, 상기 디젤/디젤파일럿 선택스위치(80)에서 디젤제어장치(13)와 천연가스제어장치(23)에 신호를 전달하는 것을 특징으로 하는 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.The pedal sensor 60 sends a signal to the diesel / diesel pilot selection switch 80 configured to selectively operate the diesel fuel combustion system 100 and the natural gas combustion system 200, and the diesel / diesel pilot selection switch Diesel and diesel pilot natural gas bifuel combustion system of the diesel engine, characterized in that for transmitting a signal to the diesel control device 13 and the natural gas control device (23) at (80). 제 6항 또는 제 7항에 있어서,The method according to claim 6 or 7, 상기 페달센서(60)의 일단부에는 디젤을 선택하여 기존의 디젤연료 연소시스템(100)만을 사용하는 경우에는 작동을 하지 않고, 디젤파일럿 천연가스 연소시스템(300)을 선택하여 사용할 때 운전자가 가속페달을 작동시키면 디젤연료 연소시스템(100)에서 점화를 위해 필요한 최소량의 디젤연료를 일정하게 분사시키는 역할을 하는 페달캠장치(61)가 설치되는 것을 특징으로 하는 디젤엔진의 디젤과 디젤파일럿 천연가스 바이퓨얼 연소시스템.One end of the pedal sensor 60 does not operate when the diesel is selected using only the existing diesel fuel combustion system 100, and the driver accelerates when the diesel pilot natural gas combustion system 300 is selected and used. When the pedal is operated, the diesel engine and the diesel pilot natural gas of the diesel engine, characterized in that the pedal cam device 61, which serves to uniformly spray the minimum amount of diesel fuel required for ignition in the diesel fuel combustion system 100 is installed. Bifuel combustion system.
KR1020060099194A 2006-10-12 2006-10-12 Diesel and Diesel Pilot Natural Gas Bifuel Combustion Systems in Diesel Engines Ceased KR20080032948A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190135945A (en) * 2018-05-29 2019-12-09 현대중공업 주식회사 Exhaust gas recirculation system and ship including the same
KR20230093741A (en) 2021-12-20 2023-06-27 에이치디현대중공업 주식회사 The system and method that supplies fuel to marine engines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190135945A (en) * 2018-05-29 2019-12-09 현대중공업 주식회사 Exhaust gas recirculation system and ship including the same
WO2020242230A1 (en) * 2019-05-29 2020-12-03 현대중공업 주식회사 Exhaust gas recirculation system and ship comprising same
KR20230093741A (en) 2021-12-20 2023-06-27 에이치디현대중공업 주식회사 The system and method that supplies fuel to marine engines

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