KR100350887B1 - Fuel supply apparatus for cng engine - Google Patents

Fuel supply apparatus for cng engine Download PDF

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Publication number
KR100350887B1
KR100350887B1 KR1019960037116A KR19960037116A KR100350887B1 KR 100350887 B1 KR100350887 B1 KR 100350887B1 KR 1019960037116 A KR1019960037116 A KR 1019960037116A KR 19960037116 A KR19960037116 A KR 19960037116A KR 100350887 B1 KR100350887 B1 KR 100350887B1
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South Korea
Prior art keywords
regulator
supply pipe
cng
fuel
combustion chamber
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KR1019960037116A
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Korean (ko)
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KR19980017342A (en
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황계상
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기아자동차주식회사
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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
    • F02M37/0047—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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • 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
    • F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: A fuel supply apparatus for a CNG engine is provided to achieve improved accelerating performance by permitting sufficient amount of high pressure fuel to flow into the combustion chamber through the second injector when a vehicle is rapidly accelerated by the accelerating pedal. CONSTITUTION: A supply pipe is branched off from a supply pipe(18) arranged between a CNG cylinder(10) and a regulator(14), and a secondary regulator(16) is mounted on the branch supply pipe. The supply pipe extended from the secondary regulator is divided into four sections, each of four sections is installed in each combustion chamber and equipped with a solenoid valve(20). The compressed fuel gas is discharged from the CNG cylinder, and the pressure of the compressed fuel gas is reduced through the regulator and the secondary regulator. Thus, the fuel gas with the reduced pressure flows into the combustion chamber.

Description

CNG엔진의 연료 공급장치Fuel supply of CNG engine

본 발명은 자동차 엔진의 한 종류인 CNG 엔진에 관한 것으로, 더욱 상세하게 설명하면 자동차를 주행중 가속 페달을 밟아 급가속 하는 경우 2차 인젝션을 통해 연소실 내로 고압의 연료가 충분히 유입되어 가속성능을 높이기 위한 CNG엔진의 연료 공급장치에 관한 것이다.The present invention relates to a CNG engine, which is a kind of automobile engine. More particularly, the present invention relates to a CNG engine which is a kind of automobile engine, To a fuel supply device for a CNG engine.

최근의 자동차 제조회사에서는 환경 및 에너지 문제, NOx 등 도시형 환경문제, 석유를 대신할 대체 에너지 문제에 대한 대응책의 한 방법으로 CNG(compressed natural gas) 엔진차량 즉 압축 천연 가스를 사용하는 자동차를 제작하고 있음은 주지된 바와 같다.Recent automakers have created cars using compressed natural gas (CNG) vehicles, such as compressed natural gas, as a way of addressing environmental and energy issues, urban environmental issues such as NOx, and alternative energy issues that replace oil As is well known.

천연가스의 비점은 상압에서 －162℃이므로, 이것을 액체 상태로 저장하려면 초단열 용기가 필요하다.Since the boiling point of natural gas is -162 ° C at normal pressure, a super-insulating vessel is required to store it in a liquid state.

따라서, 일반적인 천연가스는 상기 천연가스의 저장, 운반시에 압축천연가스(CNG)로서 취급하게 된다.Therefore, a general natural gas is treated as compressed natural gas (CNG) during storage and transportation of the natural gas.

상기한 압축 천연가스의 저장용기를 CNG 실린더라 하는데 이 CNG 실린더에 저장되는 압축 천연가스의 압력은 경제성, 안전성 등에서 150 - 200 ㎏/cm2 정도의 고압이 이용되고 있다.The compressed natural gas storage container is called a CNG cylinder. The pressure of the compressed natural gas stored in the CNG cylinder is in the order of 150-200 kg / cm 2 for economic efficiency and safety.

첨부도면 도1은 종래의 CNG 엔진 차량의 연료 공급 계통을 개략적으로 표현한 도면으로서, 상기한 CNG 연료 공급은 엔진의 회전 속도, 흡입 공기량, 냉각수의 온도, 흡입 공기 온도 등의 상태를 각종 센서로 부터 전기 신호를 모아서 전자제어장치(1)에 입력하면 전자제어장치(1)는 자동차의 운전 조건에 가장 적합한 가스 연료 분사량으로 연산하여 출력신호를 인젝터(3)에 보내 가스 연료를 분사하며, 상기한 가스 연료를 공기와 혼합하는 작용도 전자제어장치(1)로 제어하고 있다.FIG. 1 is a schematic view of a fuel supply system of a conventional CNG engine vehicle. The CNG fuel supply system is configured to supply the state of the engine rotation speed, intake air amount, cooling water temperature, intake air temperature, When the electric signals are collected and input to the electronic control unit 1, the electronic control unit 1 computes the gas fuel injection quantity most suitable for the driving conditions of the automobile and sends an output signal to the injector 3 to inject the gaseous fuel, The function of mixing the gaseous fuel with the air is also controlled by the electronic control unit 1. [

이러한 압축 천연 가스가 인젝터(3)로 공급되는 경로를 도면을 통해 살펴보면, 고압의 압축 천연 가스가 저장된 CNG 실린더(2)로 부터 토출된 가스연료는 레귤레이터(4)로 보내어져 상기 레귤레이터(4)의 작용으로 적정 압력을 갖는 가스 연료로 감압되고, 그 감압된 가스연료는 공급파이프(5)를 거쳐 연료분배파이프(6)를 통해 각 연소실(7) 내의 연료 분사 인젝터(3)로 공급되며, 인젝터(3)는 전자제어장치(1)의 분사신호를 받고 흡기포트(8) 내로 가스연료를 분사한다.The gas fuel discharged from the CNG cylinder 2 storing the compressed natural gas at a high pressure is sent to the regulator 4 to be supplied to the regulator 4, The decompressed gaseous fuel is supplied via the supply pipe 5 to the fuel injection injector 3 in each combustion chamber 7 via the fuel distribution pipe 6, The injector 3 receives the injection signal of the electronic control unit 1 and injects the gaseous fuel into the intake port 8.

상기와 같이 분사된 가스연료는 스로틀 밸브(9)의 개폐로 인입되는 공기와 흡기포트(8)에서 혼합되고, 흡기밸브(a)의 열림으로 인해 연소실(7)로 들어가게 되며, 점화플러그(b)의 점화 불꽃에 의해 폭발 연소되어 엔진의 구동력을 발생하게 되는 것이다.The gaseous fuel injected as described above is mixed at the intake port 8 with the air drawn in by the opening and closing of the throttle valve 9 and enters the combustion chamber 7 due to the opening of the intake valve a, And the engine driving force is generated by the combustion flame.

한편, CNG 실린더(2)와 레귤레이터(4) 사이에 잠금마개(c)가 설치되어 있어 비상시 또는 레귤레이터(4)와 엔진의 고장으로 인하여 부품 교체할 때 잠궈서 CNG 실린더(2)에 있는 가스 연료가 흐르지 못하도록 한다.On the other hand, a lock cap c is provided between the CNG cylinder 2 and the regulator 4, so that it is locked when parts are replaced due to an emergency or due to a malfunction of the regulator 4 and the engine, So that it can not flow.

또한, CNG 실린더(2)에서 레귤레이터(4) 까지의 공급파이프(5)에 흐르는 연료 가스의 압력은 약 200 bar 정도 되고, 레귤레이터(4)에서 분사되는 압력은 약 7 - 9 bar 정도 된다.The pressure of the fuel gas flowing from the CNG cylinder 2 to the regulator 4 through the supply pipe 5 is about 200 bar and the pressure injected from the regulator 4 is about 7 to 9 bar.

그러나, 종래의 CNG 엔진은 압축성 기체로서 가속시는 가속페달을 밟아 이 신호를 전자제어장치(1)를 통하여 인젝터(3)에 전달하여 인젝터(3)를 작동시켜도 레귤레이터(4)의 감압 작용에 시간이 걸리기 때문에 인젝터(3)를 통하여 가속에 필요한 연료가 엔진에 충분히 공급되지 못하므로 가속페달을 밟아도 CNG 엔진 차량의 경우 가솔린 엔진과는 다르게 적정한 가속이 이루어지지 않은 문제점이 있었다.However, in the conventional CNG engine, when accelerating, the accelerator pedal is depressed and the signal is transmitted to the injector 3 through the electronic control unit 1 to actuate the injector 3 to operate the decompression function of the regulator 4 The fuel required for acceleration is not sufficiently supplied to the engine through the injector 3, so that even if the accelerator pedal is depressed, the CNG engine vehicle is not properly accelerated unlike the gasoline engine.

이에 본 발명은 상기한 종래의 자동차 CNG 엔진이 지닌 문제를 해결하기 위하여 안출된 것으로, 자동차를 주행중 가속 페달을 밟아 급가속 하는 경우 2차 레귤레이터를 통해 고압의 연료가 연소실 내로 급격히 유입되어 가속성능을 높이기 위한 CNG엔진의 연료 공급장치를 제공하고자 함에 발명의 목적이 있다.SUMMARY OF THE INVENTION Accordingly, the present invention was conceived to solve the problems of the conventional automobile CNG engine. When the automobile is accelerated by accelerating the accelerator pedal during driving, high-pressure fuel is rapidly introduced into the combustion chamber through the secondary regulator, The present invention provides a fuel supply device for a CNG engine.

상기와 같은 목적을 실현하기 위한 본 발명은 CNG 실린더와 레귤레이터 사이에 설치 연결된 공급파이프의 일측에 새로이 공급파이프를 신설하여 연결하고, 공급파이프에 2차 레귤레이터를 신설하며, 2차 레귤레이터에서 각 연소실로 설치된 공급파이프에 솔레노이드 밸브를 설치한 것이다.In order to achieve the above object, the present invention is characterized in that a new supply pipe is newly installed and connected to one side of a supply pipe installed between a CNG cylinder and a regulator, a secondary regulator is installed in a supply pipe, A solenoid valve is installed in the installed supply pipe.

따라서, 본 발명은 가속 페달을 밟아 급가속하는 경우 2차 레귤레이터를 통해 고압의 연료가 연소실내로 충분히 유입되어 가속 성능을 높일 수 있게 되는 것이다.Accordingly, in the present invention, when the accelerator pedal is stepped on and accelerated, the high-pressure fuel flows sufficiently into the combustion chamber through the secondary regulator so that the acceleration performance can be enhanced.

도 1 은 종래의 CNG연료 공급계통을 보인 개요도,1 is a schematic view showing a conventional CNG fuel supply system,

도 2 는 본 발명에 따른 CNG연료 공급계통을 보인 개요도이다.2 is a schematic view showing a CNG fuel supply system according to the present invention.

- 도면의 주요부분에 대한 부호의 설명 -Description of the Related Art [0002]

10 - CNG 실린더, 12 - 잠금마개,10 - CNG cylinder, 12 - lock cap,

14 - 레귤레이터, 16 - 2차 레귤레이터,14-regulator, 16-second regulator,

18 - 공급파이프, 20 - 솔레노이드밸브,18 - supply pipe, 20 - solenoid valve,

22 - 전자제어장치, 24 - 연료분배파이프,22 - electronic control unit, 24 - fuel distribution pipe,

26 - 연소실,28 - 흡기포트,26 - combustion chamber, 28 - intake port,

30 - 인젝터.30 - Injector.

이하 본 발명에 대하여 첨부된 예시도면 도2에 의거하여 그 구성과 작용에 대해 설명하면 다음과 같다.Hereinafter, the configuration and operation of the present invention will be described with reference to FIG.

본 발명은 CNG 실린더(10)와 레귤레이터(14) 사이에 설치 연결된 공급파이프(18)의 일측에 새로이 공급파이프(18)를 분리하여 연결하고, 이 공급파이프(18)에 2차 레귤레이터(16)를 설치하며, 2차 레귤레이터(16)에서 각 연소실로 설치된 공급파이프에서 4개의 솔레노이드 밸브로 나누어져 설치한 CNG엔진의 연료 공급장치이다.The present invention is characterized in that a supply pipe 18 is newly connected to one side of a supply pipe 18 connected between a CNG cylinder 10 and a regulator 14 and a secondary regulator 16 is connected to the supply pipe 18. [ And is a fuel supply device for a CNG engine that is divided into four solenoid valves in a supply pipe provided in each combustion chamber in the secondary regulator 16. [

상기와 같은 CNG엔진의 연료 공급장치는 첨부된 예시도면 도2에 표현된 바와 같이, CNG 실린더(10)에서 레귤레이터(14)로 연결된 공급파이프(18)의 일측에 분리하여 설치된 공급파이프(18)에 2차 레귤레이터(16)를 설치하여 CNG 실린더(10)에서 압축 가스연료가 토출되어 레귤레이터(14) 및 2차 레귤레이터(16)를 거쳐 감압되어 연소실로 인입되도록 한 것이다.The fuel supply device of the CNG engine is provided with a supply pipe 18 installed at one side of the supply pipe 18 connected to the regulator 14 in the CNG cylinder 10, And a compressed gas fuel is discharged from the CNG cylinder 10 through the regulator 14 and the secondary regulator 16 to be depressurized and drawn into the combustion chamber.

상기 CNG 실린더(10)와 2차 레귤레이터(16) 사이에 설치된 공급파이프(18) 상의 압력은 약 200 - 20 bar 정도 되고, 2차 레귤레이터(16)를 통과한 연료 가스의 압력은 약 20 bar 정도의 고압이 되도록 한다.The pressure on the supply pipe 18 provided between the CNG cylinder 10 and the secondary regulator 16 is about 200 to 20 bar and the pressure of the fuel gas passing through the secondary regulator 16 is about 20 bar .

또한, 2차 레귤레이터(16)에서 각 연소실에 공급파이프(18)를 설치한 상태에서 각 연소실로 보내지는 연료가스를 제어할 수 있도록 솔레노이드밸브(20)를 설치하고, 솔레노이드밸브(20)는 전자제어장치(22)와 연계하여 급가속 할 때 전자제어장치(22)의 신호를 받아 솔레노이드밸브(20)가 열리면 2차 레귤레이터(16)를 거친 연료가스가 순간적으로 각 연소실로 공급되어 자동차의 급가속이 이루어지게 된다.A solenoid valve 20 is provided in the secondary regulator 16 so as to control the fuel gas to be supplied to each combustion chamber in a state where the supply pipe 18 is installed in each combustion chamber. When the solenoid valve 20 is opened in response to the signal from the electronic control unit 22 when the vehicle is rapidly accelerated in conjunction with the control unit 22, the fuel gas passing through the secondary regulator 16 is instantaneously supplied to the respective combustion chambers, Acceleration is performed.

즉, CNG 연료를 급격하게 연소실(26)에 분사시키기 위해서는 종래의 인젝션 압력(약 7 - 9 bar)보다 더 높은 압력을 사용하면 가능하다.That is, it is possible to use a pressure higher than the conventional injection pressure (about 7 - 9 bar) in order to rapidly inject the CNG fuel into the combustion chamber 26.

그러나 가속을 위해 사용되는 연료 역시 일정압력으로 분사 되어야만 제어가 가능하므로 이를 위해 2차 레귤레이터(16)를 장착하고 분사 위치는 흡기포트(28)의 인젝터(30) 취부 옆에 홀(hole)을 가공하여 장착하며, 분사 여부는 솔레노이드밸브(20)를 사용하고, 솔레노이드밸브(20)는 전자제어장치(22)의 신호에 의해 제어를 받는다.However, since the fuel to be used for acceleration can also be controlled only by injecting the fuel at a predetermined pressure, a secondary regulator 16 is mounted and a hole is formed next to the injector 30 of the intake port 28 The solenoid valve 20 is controlled by a signal from the electronic control unit 22. The solenoid valve 20 is a solenoid valve.

따라서, 본 발명은 CNG 실린더(10)와 레귤레이터(14) 사이에 설치 연결된 공급파이프(18)의 일측에 새로이 공급파이프(18)를 분리하여 연결하고, 이 공급파이프(18)에 2차 레귤레이터(16)를 설치하며, 2차 레귤레이터(16)에서 각 연소실로 설치된 공급파이프에서 4개의 솔레노이드 밸브로 나누어져 설치되어 있어 가속 페달을 밟아 급가속하는 경우 2차 인젝터를 통해 연소실(26) 내로 급격히 고압의 연료가 유입되어 가속 성능을 높일 수 있게 되는 효과가 있다.Therefore, the present invention is characterized in that a supply pipe 18 is newly connected to one side of a supply pipe 18 connected between a CNG cylinder 10 and a regulator 14, and a secondary regulator 16 are installed in the combustion chamber 26 and are divided into four solenoid valves by a supply pipe provided in each combustion chamber of the secondary regulator 16. When the accelerator pedal is depressed and rapidly accelerated, So that the acceleration performance can be enhanced.

Claims (1)

CNG 실린더(10)와 레귤레이터(14) 사이에 설치 연결된 공급파이프(18)의 일측에 새로이 공급파이프(18)를 분리하여 연결하고, 이 공급파이프(18)에 2차 레귤레이터(16)를 설치하며, 2차 레귤레이터(16)에서 각 연소실로 설치된 공급파이프에서 4개의 솔레노이드 밸브로 나누어져 설치한 것을 특징으로 하는 CNG엔진의 연료 공급장치.A supply pipe 18 is newly connected to one side of a supply pipe 18 installed between the CNG cylinder 10 and the regulator 14 and a secondary regulator 16 is installed in the supply pipe 18 And four solenoid valves in a supply pipe provided in each combustion chamber in the secondary regulator (16).
KR1019960037116A 1996-08-30 1996-08-30 Fuel supply apparatus for cng engine KR100350887B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6213766A (en) * 1985-07-10 1987-01-22 Nippon Carbureter Co Ltd Method for controlling amount of fuel injection of fuel gas
JPS62176467U (en) * 1986-04-30 1987-11-09
JPH06229280A (en) * 1993-02-05 1994-08-16 Unisia Jecs Corp Fuel supply control device for internal combustion engine
JPH06264821A (en) * 1993-03-10 1994-09-20 Nissan Motor Co Ltd Fuel feeder for cng engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6213766A (en) * 1985-07-10 1987-01-22 Nippon Carbureter Co Ltd Method for controlling amount of fuel injection of fuel gas
JPS62176467U (en) * 1986-04-30 1987-11-09
JPH06229280A (en) * 1993-02-05 1994-08-16 Unisia Jecs Corp Fuel supply control device for internal combustion engine
JPH06264821A (en) * 1993-03-10 1994-09-20 Nissan Motor Co Ltd Fuel feeder for cng engine

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