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

김창업   (LP가스기계연구사업단 한국기계연구원  ); 오승묵   (LP가스기계연구사업단 한국기계연구원  ); 강건용   (LP가스기계연구사업단 한국기계연구원  );
  • 초록

    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.


  • 주제어

    LPG액상분사 .   이중점화 .   희박운전한계 .   분사시작.  

  • 참고문헌 (13)

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    12. Regulated and Non Regulated Emissions of a Commercially Attractive LPG Vehicle , B. Hollemans;M. de Roos;L. Conti;G. Margaria , TNO-paper VM9502 / v.,pp.,
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