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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.
성층급기 직접분사식 가솔린기관 개발에 관한 연구 (Ⅱ) -연료분사압력 및 부하변동에 따른 연소특성 해석-
채재우(J.O.Chae),이상만(S.M.Lee),조민수(M.S.Cho),노정용(J.Y.Noh),Li Jianwen(Li Jianwen),정영식(Y.S.Jeong) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
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, a reflector was adapted on cylinder head. An installation of the reflector in front of injector nozzle leads the mixture to be rich near spark plug. Therefore, the mixture near the spark plug is locally rich to ignite a fuel while the lean mixture is wholly introduced into the combustion chamber. In this paper, the characteristics of combustion is analyzed with the variations of injection pressure and load in a stratified-charge direct injection single cylinder gasoline engine. The results are summarized as follows ;<br/> 1. The MBT spark timing is influenced by engine rpm and load, but has a little relation with fuel injection pressure.<br/> 2. The MBT spark timing is approached to TDC with the increase of load on account of the increase of evaporation energy. Therefore, the peak pressure of cylinder is also delayed with the increase of load.<br/> 3. The stratification effect is cleared with the increase of injection. It is considered by the development of secondary diffusive combustion and the increase of heat release of same region, but proceed rapidly than diesel engine. Specially, in the case of high pressure inj-ection(170bar) and high load(3.0kgf ? m ), the diffusive combustion part is developed excessively and results to the increase of peak pressure than middle load.<br/> 4. The index of engine stability, COV_inwp value, is generally decreased with the increase of load. Finally, the 150bar injection pressure is appeared as optimum in this research.<br/>