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Combustion and Emission Characteristics According to the Fuel Injection Ratio of an Ultra-Lean LPG Direct Injection Engine

Author

Listed:
  • Cheolwoong Park

    (Department of Engine Research, Environmental and Energy Systems Research Division, Korea Institute of Machinery and Materials, Daejeon 34103, Korea)

  • Taeyoung Kim

    (Department of Engine Research, Environmental and Energy Systems Research Division, Korea Institute of Machinery and Materials, Daejeon 34103, Korea)

  • Gyubaek Cho

    (Department of Engine Research, Environmental and Energy Systems Research Division, Korea Institute of Machinery and Materials, Daejeon 34103, Korea)

  • Janghee Lee

    (Department of Engine Research, Environmental and Energy Systems Research Division, Korea Institute of Machinery and Materials, Daejeon 34103, Korea)

Abstract

The effect of the fuel injection ratio on the combustion and emission characteristics of stratified lean mixture combustion was investigated for a spray-guided liquefied petroleum gas (LPG) direct injection engine. Inter-injection spark-ignition combustion—a specially designed combustion strategy for LPG fuel derived from a two-staged injection—was employed to maximize the improvement in thermal efficiency when combustion stability is secured. When changing the fuel injection ratio, the optimum spark advance and fuel injection timings were experimentally determined to maximize the thermal efficiency based on sweeping timings. The optimum fuel injection ratio with the highest thermal efficiency (42.76%) and stable operation was 60%/40%, with the optimization of the spark advance and fuel injection timing, because of the locally rich mixture region in the recirculation zone. NO x emissions were at their highest level with a fuel injection ratio of 60%/40% because of the high combustion temperature, and the levels of total hydrocarbon and CO emissions with 50%/50% and 60%/40% fuel injection ratios were similar, whereas emissions at 70%/30% were significantly higher because of fuel wetting and the formation of over-lean mixture.

Suggested Citation

  • Cheolwoong Park & Taeyoung Kim & Gyubaek Cho & Janghee Lee, 2016. "Combustion and Emission Characteristics According to the Fuel Injection Ratio of an Ultra-Lean LPG Direct Injection Engine," Energies, MDPI, vol. 9(11), pages 1-12, November.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:11:p:920-:d:82295
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    References listed on IDEAS

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    1. Myung, Cha-Lee & Choi, Kwanhee & Kim, Juwon & Lim, Yunsung & Lee, Jongtae & Park, Simsoo, 2012. "Comparative study of regulated and unregulated toxic emissions characteristics from a spark ignition direct injection light-duty vehicle fueled with gasoline and liquid phase LPG (liquefied petroleum ," Energy, Elsevier, vol. 44(1), pages 189-196.
    2. Gong, Chang-Ming & Huang, Kuo & Jia, Jing-Long & Su, Yan & Gao, Qing & Liu, Xun-Jun, 2011. "Regulated emissions from a direct-injection spark-ignition methanol engine," Energy, Elsevier, vol. 36(5), pages 3379-3387.
    3. Kim, Tae Young & Park, Cheolwoong & Oh, Seungmook & Cho, Gyuback, 2016. "The effects of stratified lean combustion and exhaust gas recirculation on combustion and emission characteristics of an LPG direct injection engine," Energy, Elsevier, vol. 115(P1), pages 386-396.
    4. Park, Cheolwoong & Kim, Sungdae & Kim, Hongsuk & Moriyoshi, Yasuo, 2012. "Stratified lean combustion characteristics of a spray-guided combustion system in a gasoline direct injection engine," Energy, Elsevier, vol. 41(1), pages 401-407.
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    Cited by:

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