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채재우(J. O. Chae),이상만(S. M. Lee),차민혁(M. H. Cha),조민수(M. S. Cho),노정용(J. Y. Noh),Li Jianwen(Li Jianwen),정영식(Y. S. Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
In general, the stratified charge for direct injection gasoline engine should be introduced to achieve ultra-lean combustion. In order to apply for the concept of stratified charge into direct injection gasoline engine, we adopted a reflector inside the cylinder head. An installation of the reflector in front of injector nozzle leads the mixture to be rich near spark plug. As mentioned above, the mixture near the spark plug is locally rich to ignite a fuel while the lean mixture is wholly introduced into the combustion chamber. As a result of the test, ultra-lean comustion could be achieved up to 57 : 1 of AIF ratio without swirl control unit at idle condition. In the case of installation of swirl control unit, considerably extended AIF ratio is expected. So far, the optimizations including analysis of exhaust gases, compromise for conflicting conditions, and fuel injection system have been studied.