• Title/Summary/Keyword: 세미리턴 방식

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LPi Engine Combustion and Emission Characteristics Depending on LPG Properties from Various Fuel Supply Types by Using DC Motor Type Fuel Pump (DC모터형 연료펌프를 이용한 연료공급방식별 LPG성상에 따른 LPi엔진 연소 및 배출가스 특성)

  • Kim, Ju-Won;Hwang, In-Goo;Myung, Cha-Lee;Park, Sim-Soo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.12
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    • pp.907-914
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    • 2008
  • This study is mainly focused on the assessment of return, semi return, and returnless fuel supply system for an LPi engine. In order to compare the return type with returnless one with various LPG blends, combustion analysis and cyclic THC emission characteristic were tested at the part load operating condition of the LPi engine. Considering heat balance of each fuel supply systems, pressure and temperature increment of return type showed lower at the fuel rail during idle warm up operation. However, those of returnless type at LPG tank maintained stable and slow increment because the heat transfer from the LPi engine was minimized. Finally, hot restartability of each fuel supply systems were evaluated with the various LPG blends and fuel temperatures. As a result, semi return type has equivalent performance to return type considering combustion and emission characteristic, hot restartability performance for LPi engine.

Effect of semi-return fuel supply system on the startability and HC/NOx emissions during cold transient starting phase in an LPi engine (LPG성상에 따른 세미리턴방식 LPi엔진의 시동성 및 싸이클 별 HC/NOx 배출 특성)

  • Kim, Ju-Won;Choi, Kwan-Hee;Myung, Cha-Lee;Park, Sim-Soo
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.2910-2915
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    • 2008
  • This paper was investigated the behaviors of the engine and combustion phenomena for various LPG compositions in the semi-return type system, which is not recircurated to LPG tank through furl rail, applied LPi engine during a cold idle condition and including a cold start of the engine. Cyclic HC and NOx emissions were measured at exhaust port to examine their formation mechanical and reduction mechanical with fast response gas analyzers. Various ignition timing is experimented to study the characteristics of combustion phenomena, HC/NOx emissions during fast idle. Also, this study was investigated start delay time, cylinder pressure, HC/NOx emissions, Mass Fraction Burned, starting time to evaluate performance of transient cold startability. Compared to the return type system, the semi-return type system have advantages in point of production cost and equivalent performance of engine starting time and pressure settling time.

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