(3-02) A Fundamental Study on a MPI LPG Engine for Heavy-duty Vehicles((AF-1)Alternative Fuels 1-Gas Engines)

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概要

• 論文の詳細を見る

• A MPI (Multi Point Injection) LPG (Liquefied Petroleum Gas) engine for heavy-duty vehicles such as city buses has been developed, which uses the liquid phase LPG injection (hereafter LPLI) system, since MPI fuel system is able to accomplish the higher power and efficiency, and lower emissions compared to the SPI (Single Point Injection) and mixer type systems. In this fundamental study on the LPLI system, the engine output and combustion performance were investigated with various operating conditions using a single cylinder engine, which has a displacement volume of 1.8L and compression ratio of 10. The experimental results revealed that the volumetric efficiency and engine output increased by approximately 10%, and exhaust gas temperature decreased by 20〜30℃ when the liquid phase LPG is injected. This MPI LPG fuel system also brought an additional advantage of controlling knocking phenomenon via optimizing spark timing and compression ratio. An LPLI engine in this work was also able to be operated either at lean condition of λ=1.5 or with EGR (30%) while achieving stable combustion. The optimized swirl ratio was around 2, and the oil spot method demonstrated that the high swirl ratios above 2.3 did not show merit in breaking swirl flow into small turbulence scale. Among the piston cavities tested in this work, such as bathtub, ellipse, double ellipse and nebula type, the performance of a nebula type showed highest efficiency and engine output under lean mixture conditions. An investigation for various LPG fuel compositions was also carried out, and revealed that the case with 40% propane and 60% butane shows the lowest efficiency at stoichiometry, however, as the mixture became leaner its efficiency increased and became even higher than the case with 100% propane.

• 一般社団法人日本機械学会の論文
• 2001-07-01

著者

• Lee Daeyup

  Lp Gas Engine Task Force Team Korea Institute Of Machinery And Materials

• Kang Kern

  LP Gas Engine Task Force Team, Korea Institute of Machinery and Materials

• Oh SeungMook

  LP Gas Engine Task Force Team, Korea Institute of Machinery and Materials

• Kim ChangUP

  LP Gas Engine Task Force Team, Korea Institute of Machinery and Materials

• Kang Kern

  Lp Gas Engine Task Force Team Korea Institute Of Machinery And Materials

• Kim Changup

  Lp Gas Engine Task Force Team Korea Institute Of Machinery And Materials

• Oh Seungmook

  Lp Gas Engine Task Force Team Korea Institute Of Machinery And Materials

関連論文

• Effects of Injection Timing on Mixture Distribution in a Liquid-Phase LPG Injection Engine for a Heavy-Duty Vehicle
• (3-02) A Fundamental Study on a MPI LPG Engine for Heavy-duty Vehicles((AF-1)Alternative Fuels 1-Gas Engines)

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