Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on Emission Reduction with Injection Strategy and Exhaust-Gas Recirculation in Gasoline Direct Injection Engine

직접분사식 가솔린 엔진의 분사전략 변경 및 EGR 적용을 통한 배기저감에 관한 연구

  • Park, Cheol-Woong (Engine research team, Korea Institute of Machinery and Materials) ;
  • Kim, Hong-Suk (Engine research team, Korea Institute of Machinery and Materials) ;
  • Woo, Se-Jong (Engine research team, Korea Institute of Machinery and Materials) ;
  • Kim, Yong-Rae (Engine research team, Korea Institute of Machinery and Materials)
  • 박철웅 (한국기계연구원 그린동력연구실) ;
  • 김홍석 (한국기계연구원 그린동력연구실) ;
  • 우세종 (한국기계연구원 그린동력연구실) ;
  • 김용래 (한국기계연구원 그린동력연구실)
  • Received : 2011.10.26
  • Accepted : 2011.12.19
  • Published : 2012.03.01
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Abstract

Nowadays, automobile manufacturers are focusing on the reduction of exhaust-gas emissions because of the harmful effects on humans and the environment, such as global warming by greenhouse gases. Gasoline direct injection (GDI) combustion is a promising technology that can improve fuel economy significantly compared to conventional port fuel injection (PFI) gasoline engines. In the present study, ultra-lean combustion with an excess air ratio of over 2.0 is realized with a spray-guided-type GDI combustion system, so that the fuel consumption is improved by about 13%. The level of exhaust-gas emissions and the operation performance with the multiple injection strategy and exhaust-gas recirculation (EGR) are examined in comparison with the emission regulations and from the point of view of commercialization.

자동차배출가스는 이산화탄소($CO_2$)에 의한 지구온난화 및 탄화수소(HC)와 질소산화물($NO_x$)에 의한 오존 생성을 야기하는 등, 인체와 환경에 나쁜 영향을 미치기 때문에 이에 대한 관심이 증폭되고 있다. 가솔린 직접분사 (Gasoline Direct Injection; GDI)엔진은 디젤엔진과 같이 연소실내에 연료를 직접 공급하는 방식으로서 가솔린엔진의 취약점으로 지적되어 오던 높은 연료소비율 문제를 획기적으로 개선할 수 있는 기술로 평가되고 있다. 본 연구에서는 분무유도방식(Spray-guided type)의 GDI엔진을 이용하여 공기과잉률 2.0 이상의 초희박 연소를 통해 연료소비율을 개선하였다. 추가적인 연료소비율 개선 및 배출가스 저감을 위해 희박연소시 다단 분사전략과 Exhaust Gas Recirculation (EGR)을 적용하였다. 배출가스 수준과 운전성능을 평가하고 이를 배출가스 규제와 비교 검토함으로써 국내 관련기술 개발 방향 및 상용화 가능성에 대해 검토하고자 하였다.

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References

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