In a bi-fuel engine using gasoline and LPG fuel, with the current ignition timing for gasoline being used, the optimum performance could not be taken in LPG fuel supply mode. The ignition timing in LPG fuel mode must be advanced much more than that of gasoline mode for the compensation of its higher ignition temperature. The purpose of this study is to investigate how the ignition spark timing conversion influences the engine performance of LPG/Gasoline Bi-Fuel engine. In order to investigate the engine performance during combustion, engine performance are sampled by data acquisition system, for example cylinder pressure, pressure rise rate and heat release rate, while change of the rpm(1500, 2000, 2500) and the ignition timing advance(5°, 10°, 15°, 20°). As the result, between 1500rpm, 2000rpm and 2500rpm, the cylinder pressure and pressure rise rate was increased when the spark ignition was advanced but pressure rise rate at 20° was smaller value.

Abstract
 1. 서론
 2. 실험장치 및 실험방법
  2.1 실험장치
 3. 실험결과 및 고찰
  3.1 실린더내의 가스압력
  3.2 실린더내의 피크압력
  3.3 실린더내의 압력상승률
  3.4 실린더내의 열발생률
 4. 결론
 참고문헌

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• 박명호(강원대학교 기계공학과) | Myungho Park