KR100986368B1 - apparatus for decreasing a supply air temperature of liquid propane injection engine - Google Patents

apparatus for decreasing a supply air temperature of liquid propane injection engine Download PDF

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KR100986368B1
KR100986368B1 KR1020040071204A KR20040071204A KR100986368B1 KR 100986368 B1 KR100986368 B1 KR 100986368B1 KR 1020040071204 A KR1020040071204 A KR 1020040071204A KR 20040071204 A KR20040071204 A KR 20040071204A KR 100986368 B1 KR100986368 B1 KR 100986368B1
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fuel
line
engine
manifold
lpg
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KR20060022399A (en
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정재경
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현대자동차주식회사
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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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • 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

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

Abstract

본 발명은, 연료 탱크에서 LPG 연료가 연료공급라인을 통해 엔진의 인젝터로 공급된 후 남은 LPG 연료가 연료복귀라인을 통해 연료탱크로 재유입되고, 엔진의 실린더로 들어가는 공기 통로인 매니폴드가 구비된 엘피아이 엔진에 있어서, 상기 연료공급라인(20)에는 상기 LPG 연료의 증발 잠열에 의해 상기 매니폴드내에 흐르는 흡입공기의 온도를 낮추도록 상기 매니폴드(32, 34)에 접촉하면서 상기 연료복귀라인(22)으로 바이패스되는 바이패스라인(24)이 설치되어 있으므로, 흡입공기의 온도를 낮추므로써 체적효율을 증대시켜 출력을 상승시킬 수 있다.The present invention provides a manifold, which is an air passage through which LPG fuel is supplied from the fuel tank to the injector of the engine through the fuel supply line, and the remaining LPG fuel is re-introduced into the fuel tank through the fuel return line. In the LLP engine, the fuel supply line 20 contacts the manifolds 32 and 34 to lower the temperature of intake air flowing in the manifold by latent heat of evaporation of the LPG fuel. Since the bypass line 24 which is bypassed to 22 is provided, the volume efficiency can be increased by increasing the volume efficiency by lowering the temperature of the intake air.

Description

엘피아이 엔진의 흡기온도 저감장치{apparatus for decreasing a supply air temperature of liquid propane injection engine}Apparatus for decreasing a supply air temperature of liquid propane injection engine}

도1은 종래 엘피아이 엔진의 연료 라인 시스템을 나타내는 구성도,1 is a block diagram showing a fuel line system of a conventional Elpiai engine;

도2는 본 발명에 의한 엘피아이 엔진의 흡기온도 저감장치를 나타내는 구성도,2 is a configuration diagram showing an intake air temperature reduction device of an Elpia engine according to the present invention;

도3은 도2에서 열교환통로판이 설치되는 매니폴드를 분리하여 나타내는 사시도,Figure 3 is a perspective view showing a separate manifold in which the heat exchange passage plate is installed in Figure 2,

도4는 도2의 벤튜리관의 작용상태도이다.4 is an operational state diagram of the venturi tube of FIG.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

20 : 연료공급라인 22 : 연료복귀라인20: fuel supply line 22: fuel return line

24 : 바이패스라인 26 : 열교환통로판24: bypass line 26: heat exchange passage plate

28 : 벤튜리관 32 : 어퍼 매니폴드28: Venturi tube 32: Upper manifold

34 : 로워 매니폴드34: lower manifold

본 발명은 LPI 엔진의 흡기온도 저감장치에 관한 것이다. The present invention relates to a device for reducing the intake air temperature of an LPI engine.                         

엘피아이(LPI : Liquid Propane Injection) 엔진은 LPG를 연료로 하여 공기와 혼합한 혼합기체를 실린더내에 분사하여 연소시키는 엔진으로서, LPI엔진에서는 액체상태로 엔진에 분사하여 연소시킴으로써 출력향상 및 배출가스 감소 등의 효과를 얻을 수 있다. 즉, LPG를 포화증기압 이상의 압력으로 가압하여 액화하여 분사하게 된다.The LPI (Liquid Propane Injection) engine is an engine that injects and combusts a mixture of air mixed with LPG as a fuel in the cylinder.In the LPI engine, it is injected into the engine in a liquid state and burned to improve output and reduce emissions. And the like can be obtained. That is, LPG is liquefied and injected by pressurizing at a pressure higher than the saturated steam pressure.

도1은 종래 LPI 엔진의 연료 라인 시스템을 나타낸다. 도시한 바와 같이 연료 탱크(2)에서 연료공급라인(4)을 통해 공급밸브(6)를 거쳐 엔진의 인젝터(8)로 공급된 후 남은 연료가 밸브(10) 및 연료복귀라인(12)을 통해 연료탱크(20)내로 재유입된다. 상기 연료복귀라인(12)에는 바이패스 밸브 및 릴리이프 밸브등이 설치되어 있다. 그리고 엔진의 실린더로 들어가는 공기 통로인 도시하지 않은 매니폴드가 구비된다.1 shows a fuel line system of a conventional LPI engine. As shown, the fuel remaining after the fuel tank 2 is supplied to the injector 8 of the engine through the supply valve 6 through the fuel supply line 4, the valve 10 and the fuel return line 12 Through the fuel tank 20 again. The fuel return line 12 is provided with a bypass valve and a relief valve. A manifold (not shown), which is an air passage that enters the cylinder of the engine, is provided.

한편, 엔진의 실린더 내로 들어가는 공기의 온도가 낮으면 보다 많은 공기가 실린더 내로 유입되어 체적효율(Volumetric Efficiency)이 증대하게 되어 출력을 상승시키는 효과가 있게 된다. 그런데, 종래의 LPI 엔진에서는 이러한 고려가 없어 출력상승에 한계가 있었다.On the other hand, when the temperature of the air entering the cylinder of the engine is low, more air flows into the cylinder, thereby increasing the volumetric efficiency (Volumetric Efficiency) to increase the output. However, in the conventional LPI engine, there is no limit in the output increase without such consideration.

따라서, 본 발명은 LPI 엔진의 LPG 연료가 가진 물성치를 이용하여 흡입공기의 온도를 낮추므로써 체적효율을 증대시키는 LPI 엔진의 흡기온도 저감장치를 제공하는데 있다.Accordingly, the present invention provides an apparatus for reducing the intake air temperature of an LPI engine by increasing the volumetric efficiency by lowering the temperature of intake air by using physical properties of the LPG fuel of the LPI engine.

본 발명에 의한 엘피아이 엔진의 흡기온도 저감장치는, 연료 탱크에서 LPG 연료가 연료공급라인을 통해 엔진의 인젝터로 공급된 후 남은 LPG 연료가 연료복귀라인을 통해 연료탱크로 재유입되고, 엔진의 실린더로 들어가는 공기 통로인 매니폴드가 구비된 엘피아이 엔진에 있어서, 상기 연료공급라인에는 상기 LPG 연료의 증발 잠열에 의해 상기 매니폴드내에 흐르는 흡입공기의 온도를 낮추도록 상기 매니폴드에 접촉하면서 상기 연료복귀라인으로 바이패스되는 바이패스라인이 설치되어 있는 것을 특징으로 한다.In the apparatus for reducing the intake temperature of an Elpiai engine according to the present invention, the LPG fuel remaining after the LPG fuel is supplied from the fuel tank to the engine injector through the fuel supply line is reintroduced into the fuel tank through the fuel return line, In an Elpia engine equipped with a manifold that is an air passage entering a cylinder, the fuel supply line contacts the manifold to lower the temperature of intake air flowing in the manifold by latent heat of evaporation of the LPG fuel. It is characterized in that the bypass line is installed is bypassed to the return line.

상기 바이패스 라인의 중간에는 상기 매니폴드의 연결플랜지부에 설치되어 흡입공기와 열교환되는 열교환통로판이 구비되어 있다.In the middle of the bypass line is provided a heat exchange passage plate which is installed in the connection flange of the manifold to exchange heat with the suction air.

상기 연료복귀라인에는 연료가 분기되어 다시 복귀되는 복귀보조라인이 설치되고, 상기 복귀보조라인에는 상기 바이패스라인을 통해 분기되는 LPG 연료를 용이하게 흡입하도록 벤튜리관이 설치되며, 상기 바이패스라인은 상기 벤튜리관에 연통되어 있다.The fuel return line is provided with a return auxiliary line where fuel is branched and returned again, and the return auxiliary line is provided with a venturi tube to easily suck LPG fuel branched through the bypass line, and the bypass line is It is in communication with the venturi tube.

이하, 도면을 참조하여 본 발명에 따른 바람직한 실시예를 설명한다. Hereinafter, with reference to the drawings will be described a preferred embodiment according to the present invention.

도2에 도시한 바와 같이, 엘피아이(LPI) 엔진에서는 도시하지 않은 연료 탱크에서 LPG 연료가 연료공급라인(20)을 통해 엔진의 인젝터(도시안됨)로 공급된 후 남은 LPG 연료가 연료복귀라인(22)을 통해 연료탱크로 재유입되고, 엔진의 실린더로 들어가는 흡입공기 통로인 매니폴드가 구비된다. 상기 메니폴드는 도3에 도시한 바와 같이 어퍼 매니폴드(32)와 로워 매니폴드(34)가 연결플랜지부(32a, 34a)에 의해 결합된 구조로 되어 있다. As shown in FIG. 2, in the LPPI engine, LPG fuel remaining after LPG fuel is supplied to the injector (not shown) of the engine through the fuel supply line 20 in a fuel tank (not shown) is returned to the fuel return line. A manifold, which is an intake air passageway which is re-introduced into the fuel tank via 22 and enters the cylinder of the engine, is provided. As shown in Fig. 3, the manifold has a structure in which the upper manifold 32 and the lower manifold 34 are joined by connecting flange portions 32a and 34a.                     

상기 연료공급라인(20)에는 상기 LPG 연료의 증발 잠열에 의해 상기 매니폴드내에 흐르는 흡입공기의 온도를 낮추도록 상기 매니폴드(32, 34)에 접촉하면서 상기 연료복귀라인(22)으로 바이패스되는 바이패스라인(24)이 설치되어 있다.The fuel supply line 20 is bypassed to the fuel return line 22 while contacting the manifolds 32 and 34 to lower the temperature of intake air flowing in the manifold by latent heat of evaporation of the LPG fuel. The bypass line 24 is provided.

상기 바이패스라인(24)의 중간에는 상기 매니폴드(34)의 연결플랜지부(32a, 34a)에 설치되어 흡입공기와 열교환되는 열교환통로판(26)이 구비되어 있다. 상기 열교환통로판(26)은 상기 연결플랜지부(32a, 34a)와 동일한 형태의 판으로 형성되어, 상기 어퍼 매니폴드(32)와 상기 로워 매니폴드(34) 사이에 설치되며 그 내부에는 분기되는 LPG 연료가 통과되는 통로가 형성되어 있다.In the middle of the bypass line 24 is provided a heat exchange passage plate 26 which is installed in the connecting flange portions 32a, 34a of the manifold 34 to exchange heat with the suction air. The heat exchange passage plate 26 is formed of a plate having the same shape as the connection flange portions 32a and 34a, and is installed between the upper manifold 32 and the lower manifold 34 and branched therein. A passage through which the LPG fuel passes is formed.

그리고, 상기 연료복귀라인(22)에는 연료가 분기되어 다시 연료복귀라인으로 복귀되는 복귀보조라인(27)이 설치되고, 상기 복귀보조라인(27)에는 상기 열교환통로판(26)을 통해 분기되는 LPG 연료를 용이하게 흡입하도록 벤튜리관(28)이 설치되며, 상기 바이패스라인(24)은 상기 벤튜리관(28)에 연통되어 있다.In addition, the fuel return line 22 is provided with a return auxiliary line 27 where the fuel is branched and returned to the fuel return line, and the return auxiliary line 27 is branched through the heat exchange passage plate 26. A venturi tube 28 is installed to easily inhale LPG fuel, and the bypass line 24 is in communication with the venturi tube 28.

상기 열교환통로판(26)의 연료입구와 연료출구에는 열교환통로판 내부로 흐르는 연료의 흐름을 개폐하는 솔레노이드 밸브 (42, 44)가 설치되고, 상기 복귀보조라인(27)의 분기점과 복귀점에는 복귀보조라인 내부로 흐르는 연료의 흐름을 개폐하는 솔레노이드 밸브(46, 48)가 설치되어 있다.The fuel inlet and the fuel outlet of the heat exchange passage plate 26 are provided with solenoid valves 42 and 44 for opening and closing the flow of fuel flowing into the heat exchange passage plate, and at the branching point and the return point of the return auxiliary line 27. Solenoid valves 46 and 48 are provided to open and close the flow of fuel flowing into the return auxiliary line.

이와 같이 구성된 본 발명에 의한 엘피아이 엔진의 흡기온도 저감장치에서, 도시하지 않은 제어수단에 의해 솔레노이드 밸브(42, 44)가 열리고, 연료공급라인(20)에서 바이패스라인(24)으로 분기되는 일정량의 LPG 연료가 열교환통로판(26)을 통과하면서 액체상태에서 기체상태로 증발하면서 주위의 열을 흡수하 게 되는데, 이때 매니폴드(32, 34)내에 흐르는 흡기의 온도를 낮추게 된다. In the apparatus for reducing the intake air temperature of the Elpia engine according to the present invention configured as described above, the solenoid valves 42 and 44 are opened by the control means (not shown) and branched from the fuel supply line 20 to the bypass line 24. A certain amount of LPG fuel passes through the heat exchange passage plate 26 to absorb the surrounding heat while evaporating from the liquid state to the gaseous state, thereby lowering the temperature of intake air flowing in the manifolds 32 and 34.

LPG 연료는 액체상태의 부탄과 프로판으로 구성되는데, 프로판의 증발 잠열은 101.8 kcal/kg이고 부탄의 증발 잠열은 92.1 kcal/kg 이다. LPG fuel consists of liquid butane and propane, the latent heat of propane is 101.8 kcal / kg and the latent heat of butane is 92.1 kcal / kg.

LPI 엔진에서 연료레일의 압력은 포화증기압+△P로 가압이 되고 인젝터로 공급되기 전 레규레터(연료압 조정기)에 의해 일정압으로 조절이 된다. 따라서 액체연료가 바이패스라인(24)으로 분기되는 경우에는 포화증기압 이하로 공급되므로 그 분기량이 매우 적게 되어 실린더로 들어가는 연료공급에는 전혀 문제가 되지 않으며 엔진 작동에는 큰 무리가 없다.In the LPI engine, the pressure of the fuel rail is pressurized to saturated steam pressure + ΔP and regulated to a constant pressure by a regulator (fuel pressure regulator) before being supplied to the injector. Therefore, when the liquid fuel is branched to the bypass line 24, since it is supplied below the saturated steam pressure, the branching amount is very small, so that it is not a problem for the fuel supply to the cylinder at all and there is no big problem in the operation of the engine.

한편, 상기 바이패스라인(24)으로 분기되는 LPG 연료는, 도시하지 않은 제어수단에 의해 열리는 솔레노이드 밸브(46, 48)가 열림에 따라 복귀보조라인(27)으로 흐르는 복귀연료가 벤튜리관(28)을 통과하면서 도4에 도시한 바와 같이 단면감소부를 지나는 복귀연료의 속도증가(V : 연속방정식에 의해 설명됨)로 인한 압력감소에 의한 압력수두차(h : 베르누이 방정식에 의해 설명됨)에 의해 용이하게 빨려서 복귀보조라인(27)으로 유입된다. On the other hand, LPG fuel branched to the bypass line 24, the return fuel flowing to the return auxiliary line 27 as the solenoid valves 46 and 48 opened by control means (not shown) are venturi pipe 28 Pressure head due to a decrease in pressure due to an increase in the velocity of the return fuel passing through the section reducing section (V: explained by the continuous equation) (h: explained by the Bernoulli equation) as shown in FIG. It is easily sucked by the flow into the return auxiliary line (27).

본 발명의 LPI 엔진의 흡기온도 저감장치에 의하면, LPG 연료가 가진 물성치를 이용하여 흡입공기의 온도를 낮추므로써 체적효율을 증대시켜 공기량에 비례하여 더 많은 연료가 연소하게 되어 출력상승의 효과가 있다.According to the intake air temperature reduction device of the LPI engine of the present invention, by increasing the volumetric efficiency by lowering the temperature of the intake air by using the physical properties of the LPG fuel, more fuel is combusted in proportion to the amount of air, thereby increasing the output. .

Claims (3)

연료 탱크에서 LPG 연료가 연료공급라인을 통해 엔진의 인젝터로 공급된 후 남은 LPG 연료가 연료복귀라인을 통해 연료탱크로 재유입되고, 엔진의 실린더로 들어가는 공기 통로인 매니폴드가 구비된 엘피아이(LPI) 엔진에 있어서, After the LPG fuel is supplied from the fuel tank to the engine injector through the fuel supply line, the remaining LPG fuel is re-introduced into the fuel tank through the fuel return line, and the Elpia is provided with a manifold, which is an air passage to the engine cylinder. LPI) engine, 상기 연료공급라인에는 상기 LPG 연료의 증발 잠열에 의해 상기 매니폴드내에 흐르는 흡입공기의 온도를 낮추도록 상기 매니폴드에 접촉하면서 상기 연료복귀라인으로 바이패스되는 바이패스라인이 설치되어 있는 것을 특징으로 하는 LPI 엔진의 흡기온도 저감장치.The fuel supply line is provided with a bypass line which is bypassed to the fuel return line while contacting the manifold to lower the temperature of the intake air flowing in the manifold by the latent heat of evaporation of the LPG fuel. Intake temperature reduction device of LPI engine. 제1항에 있어서, The method of claim 1, 상기 바이패스 라인의 중간에는 상기 매니폴드의 연결플랜지부에 설치되어 흡입공기와 열교환되는 열교환통로판이 구비되어 있는 것을 특징으로 하는 LPI 엔진의 흡기온도 저감장치.The intake air temperature reduction device of the LPI engine, characterized in that the middle of the bypass line is provided with a heat exchange passage plate is installed in the connecting flange portion of the manifold to exchange heat with the intake air. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2, 상기 연료복귀라인에는 연료가 분기되어 다시 복귀되는 복귀보조라인이 설치되고, The fuel return line is provided with a return auxiliary line where the fuel is branched and returned again, 상기 복귀보조라인에는 상기 바이패스 라인을 통해 분기되는 LPG 연료를 용이하게 흡입하도록 벤튜리관이 설치되며, The return auxiliary line is provided with a venturi tube to easily suck the LPG fuel branched through the bypass line, 상기 바이패스라인은 상기 벤튜리관에 연통되어 있는 것을 특징으로 하는 LPI 엔진의 흡기온도 저감장치.And said bypass line is in communication with said venturi tube.
KR1020040071204A 2004-09-07 2004-09-07 apparatus for decreasing a supply air temperature of liquid propane injection engine KR100986368B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578157A (en) 1978-12-08 1980-06-12 Toyota Motor Corp Suction device for multicylinder internal combustion engine
JPH07180631A (en) * 1993-10-28 1995-07-18 Siemens Ag Reducing device for fuel temperature in fuel tank for automobile
JPH08291715A (en) * 1995-04-21 1996-11-05 Tokyo Gas Co Ltd Intake mechanism for mirror cycle engine
KR19980048553A (en) * 1996-12-13 1998-09-15 김혜광 Output Enhancer of Gas Fuel Internal Combustion Engine by Temperature Control of Intake Air

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578157A (en) 1978-12-08 1980-06-12 Toyota Motor Corp Suction device for multicylinder internal combustion engine
JPH07180631A (en) * 1993-10-28 1995-07-18 Siemens Ag Reducing device for fuel temperature in fuel tank for automobile
JPH08291715A (en) * 1995-04-21 1996-11-05 Tokyo Gas Co Ltd Intake mechanism for mirror cycle engine
KR19980048553A (en) * 1996-12-13 1998-09-15 김혜광 Output Enhancer of Gas Fuel Internal Combustion Engine by Temperature Control of Intake Air

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