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

The Korean Society of Mechanical Engineers (대한기계학회)
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Effect of Multiple Injection on the Performance and Emission Characteristics of Lean Burn Gasoline Direct Injection Engines

다단분사가 초희박 GDI 엔진의 성능 및 배기에 미치는 영향

  • Oh, Jin-Woo (Environmental System Research Division / Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Park, Cheol-Woong (Environmental System Research Division / Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Kim, Hong-Suk (Environmental System Research Division / Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Cho, Gyu-Baek (Environmental System Research Division / Engine Research Team, Korea Institute of Machinery & Materials)
  • 오진우 (한국기계연구원 그린동력연구실) ;
  • 박철웅 (한국기계연구원 그린동력연구실) ;
  • 김홍석 (한국기계연구원 그린동력연구실) ;
  • 조규백 (한국기계연구원 그린동력연구실)
  • Received : 2011.06.16
  • Accepted : 2011.11.04
  • Published : 2012.02.01
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Abstract

Currently, in order to meet the reinforced emissions regulations for harmful exhaust gas including carbon dioxide ($CO_2$) as a greenhouse gas, technologies for reducing $CO_2$ emission and fuel consumption are being developed. Gasoline direct injection (GDI) systems have the advantage of improved fuel economy and higher power output than port fuel injection gasoline engine systems. The aim of this study is to examine the performance and emission characteristics of a lean burn GDI engine equipped with spray-guided-type combustion system. Stable lean combustion was achieved with a late fuel injection strategy under a constant operating condition. Further improvement in specific fuel consumption is possible with the introduction of multiple fuel injection strategies, which also increases hydrocarbon (HC) and nitrogen oxide ($NO_x$) emissions and decreases carbon monoxide (CO) emission.

현재 세계적으로 배출가스 규제 강화와 유가 상승으로 인해 가솔린엔진에서 배출되는 유해 배출 가스 저감기술 및 연비향상 기술 개발이 절실히 요구되고 있다. 가솔린 직접분사(GDI; Gasoline direct injection) 기술은 가솔린 연료를 직접 연소실에 분사하여 정밀한 연소제어를 통해 매우 희박한 혼합기에서도 고효율의 연소가 가능하게 함으로써 연비저감과 고출력을 동시에 만족할 수 있는 효과적인 기술이다. 본 연구에서는 분무유도방식(spray-guided type)을 이용한 GDI 엔진을 개발하여 안정적인 희박연소를 구현하였다. 자주 사용되는 운전영역에서 연료분사시기의 TDC(Top dead center) 인근으로의 지각을 통하여 안정적인 희박연소를 구현하였으며, 다단분사를 적용하여 추가적인 연료소비율의 개선이 가능한 반면 탄화수소(THC)와 질소산화물($NO_x$)의 배출은 증가하고 CO의 배출은 감소되었다.

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References

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