• Title/Summary/Keyword: Liquid Phase LPG Injection(LPLI)

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Fundamental Study on Liquid Phase LPG Injection System for Heavy-Duty Engine (I) (대형엔진용 액상분사식 LPG 연료공급 방식에 대한 기초연구 (1))

  • 김창업;오승묵;강건용
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.4
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    • pp.85-91
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    • 2001
  • LPG has been well known as a clean alternative fuel for vehicles. As a fundamental study on liquid phase LPG injection (hereafter LPLI) system application to heavy-duty engine, engine output and combustion performance were investigated with various operating conditions using a single cylinder engine equipped with the LPLI system. Experimental results revealed that no problems were occurred in application of the LPG fuel to heavy-duty engine, and that volumetric efficiency and engine output, by 10% approximately, were increased with the LPLI system. It was resulted from the decrease of the intake manifold temperature through liquid phase LPG fuel injection. These results provided an advantage in the decrease of the exhaust gas temperature, in the control of knocking phenomena, spark timing and compression ratio. The LPLI engine could normally operated under $\lambda$=1.5 or EGR 30% condition. The optimized swirl ratio for the heavy duty LPG engine was found around R_s$ = 2.0.

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Reaction Characteristics of Rubbers and LPG fuels in LPLi Fuel Supply System (고무류 반응특성이 LPG액상공급시스템의 연료분사기 성능에 미치는 영향)

  • Kim, Chang-Up;Park, Cheol-Woong;Choi, Kyo-Nam;Kang, Kern-Yong
    • Journal of ILASS-Korea
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    • v.12 no.2
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    • pp.94-100
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    • 2007
  • The liquid phase LPG injection (LPLi) system (the third generation technology) has been considered as one of the next generation fuel supply systems for LPG vehicles, since it has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type (the second generation technology) fuel supply system. To investigate the characteristics of LPG residue in liquid phase LPG injection system, various rubbers in LPG fuel system were reacted with LPG fuels during 3 months. The experimental results showed that the residue of a cover rubber in a fuel pump after test increased 10 times higher than that before test. Furthermore, the amount of sulfur, nitrogen species which are considered as main sources in deposit formation in the LPLi fuel injector were also found to be higher than that in original LPG fuel. And rubber properties of fuel pump cover were decreased after reaction test compared with those of the original rubber. Therefore, the rubber for fuel pump cover is not suitable for a proper material in LPLi fuel system. And these results can provide more information if a motor company shares the data of core rubber parts in field test LPLi vehicles.

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Reduction of Beating noise at LPLi pump (LPLi 연료펌프의 맥놀이 소음 저감 연구)

  • Gang, Tae-Sik;Sim, Jae-Gi
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11b
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    • pp.161-165
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    • 2005
  • Until now LPG car has drived used to mixer and vaporizer. So LPG car always has problems back fire and when in the winter. LPG Car's Fuel consumption is rather than gasoline. But LPLi Fuel pump located in the fuel tank is directly injection in the engine. So Fuel consumption is better than LPG mixer system and result to reduced exhaust gas. In this paper to reduction of beating noise of LPLi(liquid phase LPG Injection) fuel pump. General speaking we know, beating noise is occur to near frequency each of pump. So we Modification of RPM through chang of amature turn number and area of dimension of the pump's body.

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Reaction Characteristics of LPG Fuel and Rubber Parts of Fuel Supply System in Liquid Phase LPG Injection (LPLi) System (LPG액상분사식(LPLi) 엔진에서 연료와 연료공급계통 고무류 부품사이의 반응성 연구)

  • Kim, Chang-Up;Park, Cheol-Woong;Kang, Kern-Yong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.33 no.4
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    • pp.272-277
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    • 2009
  • The liquid phase LPG injection (LPLi) system (the 3rd generation technology) has been considered as one of the most promising fuel supply systems for LPG vehicles. To investigate the reaction characteristics of LPG with rubber parts in LPLi system, various rubbers were tested. The results showed that the amount of residue from the cover rubber of a fuel pump was increased about 10 times after testing. Furthermore, the amount of sulfur and nitrogen species which are considered as main sources of deposit formation in LPLi fuel injectors were also found to be higher than those in original LPG fuel. In addition, these residues made the core parts of LPLi injector such as needle and nozzle, partially worn, which eventually causes leakage in LPLi injectors.

Icing Characteristics of Liquid Phase LPG Injection According to Butane and Propane Mixing Rates (부탄과 프로판 혼합비율에 따른 액상 LPG 분사시 Icing 특성)

  • Kim, Yung-Jin;Cho, Won-Joon;Lee, Ki-Hyung
    • Journal of ILASS-Korea
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    • v.16 no.3
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    • pp.146-151
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    • 2011
  • LPG(Liquified Petroleum Gas) fuel for vehicles has lots of advantages such as low emission level, cheaper fuel cost and enough infrastructure. Therefore it arouses interest as an alternative engine to reduce emission of diesel engines. Especially MPI(Multi Point Injection) type LPLi(Liquid Phase LPG injection) system could have overcome the disadvantages of mixer types such as low engine performance, decreased charging efficiency and cold starting difficulty. However ice formation on the nozzle tip and intake port due to the freezing of moisture around the components is often observed in LPLi systems. This icing phenomenon is the direct cause of unstable engine combustion, resulting in engine emissions. Therefore in this research, a spray visualization test for LPG injection was carried out to obtain the basic information of an LPLi injector, then the effects of butane and propane mixing rates on ice formation at the intake port and nozzle tip was investigated. As a result, the icing characteristics of them showed contrary results according to the mixing rates.

LPLi Engine Performance and Vehicle Exhaust Emission Characteristics (액상 분사 LPG 엔진 성능 및 차량 배기 배출물 특성에 관한 연구)

  • 임종훈;명차리;박심수;양승주
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.4
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    • pp.15-21
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    • 2003
  • LPG is considered as one of the most prominent alternative automotive fuels in worldwide. However, conventional mixer system can not meet the emission regulations as the mileage accumulation increased. Recently, much attention is focused on the development of LPG liquid injection fuel systems to increase the engine performance and reduce the exhaust emissions. This study evaluates the LPLi(Liquid Phase LPG injection) engine performance and exhaust emission characteristics using a 3.0 liter LPG engine. The fuel supply system and engine management system were changed from FBM into LPLi to control the precise mixture ratio and optimized spark advance.

Durability Properties of Liquid Phase LPG Injection System with Various Qualities of LPG Fuels (LPG연료품질에 따른 LPG액상분사방식의 내구특성연구)

  • 김창업;오승묵;강건용
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.73-78
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    • 2004
  • The liquid phase LPG injection (LPLi) system (the third generation technology) has been considered as one of the next generation fuel supply systems for LPG vehicles, since it has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type(the second generation technology) fuel supply system. To investigate the durability property of core part of injector in liquid phase LPG injection system, leakage test, SEM test of injectors and analysis of unvaporized fuel components with various LPG fuel qualities were tested. The experimental results showed that no serious problem in durability test using favorable LPG fuel quality, while high leakage amount due to the large scratches in the needle and nozzle of the injector were found using LPG fuel with highly containing olefin components, especially butadiene species.

Investigation on the Injection Timing and Double Ignition Method for Heavy-duty LPG SI Lean Burn Engine (액상분사식 대형 LPG 희박연소엔진의 분사시기 및 이점점화에 관한 연구)

  • 김창업;오승묵;강건용
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.92-98
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    • 2003
  • An LPG engine for heavy-duty vehicles has been developed using liquid phase LPG injection (hereafter LPLi) system which has regarded as one of the next generation LPG fuel supply systems. In this wort to investigate the lean bum characteristics of heavy-duty LPLi engine, various injection timing (SOI, start of injection) and double ignition method were tested. The results showed that lean misfire limit of LPLi engine could be extended. by 0.2 $\lambda$ value, using the optimal SOI timing in LPLi system. Double ignition method test was carried out by installing the second spark plug and modified ignition circuit to ignite two spark plugs simultaneously. Double ignition resulted in the stable combustion under ultra lean bum condition, below $\lambda=1.7$, and extension of lean misfire limit compare to ordinary case. Therefore, LPLi engine with optimal SOI and double ignition method could be normally operated at around $\lambda=1.9$ and showed higher engine performance.

Leakage Characteristics of LPG injector with Low Viscosity LPG Fuel (저점도 LPG연료 인젝터의 누설특성에 관한 연구)

  • Kim, C.U.;Park, C.W.;Oh, S.M.;Kang, K.Y.
    • Journal of ILASS-Korea
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    • v.10 no.4
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    • pp.8-15
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    • 2005
  • The use of clean gaseous fuels for the purpose of high efficiency and low emission in automotive engines has tendency to increase in order to meet the reinforcing emission regulations and to efficiently utilize limited natural resources. Automotive companies developed and commercialized a LPG liquid injection system, which is mounted on LPLi(Liquid Phase LPG Injection) engines and vehicles based on this research trend. This research examines the biggest problem in LPLi engine, that is, the leakage characteristics of low viscosity LPG fuel according to the injector design variables. This study is also aimed to improve the performance of fuel-leakage in LPLi engine through the addition of a lubrication improver in HFRR(High Frequency Reciprocating Rig) facility. The needle displacement and the spring displacement of an LPLi injector are found to be already optimized. The possibility of a maximum of 70% leakage reduction compared to a conventional case, is verified when 1000ppm of a lubrication improvement material is added and 40% increase of a injector spring constant (K) is applied.

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Prediction of Fuel Properties on LPLi System with an External Fuel Pump (외장형 연료펌프를 사용한 LPLi시스템에서 연료의 상태량 변화 예측)

  • Kim, Jae-Hyung;Yoon, Yu-Bin;Park, Young-Joon;Song, Chun-Sub;Lee, Seang-Woak;Cho, Yong-Seok
    • Journal of ILASS-Korea
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    • v.15 no.1
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    • pp.38-43
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    • 2010
  • The LPG(Liquefied Petroleum Gas) fuel attracts attention as a clean alternative fuel. In order to further reduce the exhaust emission and improve performance in LPG engines, the LPLi(Liquid Phase LPG Injection) system is used. In LPLi system, the fuel pump performance is important for keeping the LPG over it's saturated vapor pressure. An external fuel pump is needed to improve the durability for LPG engines. This paper predicted the variation of fuel properties on the LPLi system with an external fuel pump. From each component's thermodynamic model, an 1-D simulation is developed for LPLi system with an external fuel pump. Then the 1-D simulation data analyzed and compared with the rig-test. The 1-D simulation and the rig-test produced similar results.