Proceedings of the KSME Conference (대한기계학회:학술대회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
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The Characteristic of Power and Emission for Heavy-duty CNG Engine with Direct Injection according to Various Compression Ratio

대형 직접분사식 CNG 기관의 압축비 변화에 따른 기관출력 및 배기특성

  • 남대우 (성균관대학교 대학원) ;
  • ;
  • 이종태 (성균관대학교 기계공학부)
  • Published : 2008.11.05
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Abstract

In this study, variable compression ratio system(VCRS) was applied on the heavy-duty CNG engine and the characteristics of power and emission was investigated according to the increasing of compression ratio. As compression ratio increasing, the increasing of thermal efficiency in direct injection is three times higher than that in port injection. The emission of HC and CO in direct injection is reduced about 14.2%, 17.7% but NOx is increased because of increasing temperature in cylinder.

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