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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 ;
1. The MBT spark timing is influenced by engine rpm and load, but has a little relation with fuel injection pressure.
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.
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.
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.

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ABSTRACT

1.서론

2.실험장치 및 방법

3.실험결과 및 고찰

4.결론

5.참고문헌

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UCI(KEPA) : I410-ECN-0101-2009-556-014116156