Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on Combustion and Emission Characteristics of a Diesel Engine Fuelled with Premixed Gasoline/Pilot Diesel

디젤 엔진에서 예혼합 가솔린/파일럿 디젤 이종연료의 연소 및 배출가스 특성에 관한 연구

  • Kim, Minjae (Department of Mechanical Engineering, Gachon University) ;
  • Lim, Jonghan (Department of Mechanical Engineering, Gachon University) ;
  • Kang, Kernyong (Department of Engine Research, Korea Institute of Machinery and Materials) ;
  • Lee, Seokhwan (Department of Engine Research, Korea Institute of Machinery and Materials)
  • Received : 2017.02.22
  • Accepted : 2017.03.20
  • Published : 2017.05.01
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Abstract

It is known that diesel engines have the disadvantage of high emission levels of NOx and PM. Therefore, many combustion strategies have been developed to reduce these harmful NOx and PM emissions in a diesel engine. Among these strategies, HCCI(Homogeneous Charge Compression Ignition) and PCCI(Premixed Charge Compression Ignition) are the most popular as these can reduce NOx and PM simultaneously. However, when a single fuel like diesel is applied, it is difficult to control the combustion phase and this can lead to power reduction. In this study, premixed gasoline and pilot diesel were used to overcome the problems of controllability of the combustion phase and harmful emissions. We injected gasoline directly into the combustion chamber and the gasoline/air mixture was ignited with a pilot diesel fuel near the top dead center. The results showed that the combustion and emission characteristics of dual-fuel combustion were comparable to those of conventional diesel combustion. When we applied the dual-fuel PCCI combustion concept, more than 90 % of NOx and PM emission was reduced simultaneously without significant degradation of efficiency compared to conventional diesel combustion.

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References

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