分次喷射对GDI发动机中高速工况机油稀释影响的研究  

Research on Twice Injection Influence of GDI Engine on Oil Dilution at Mid-High Speed

作　　者：杨雪培[1,2] 刘国军[1,2] 陈东[1,2] 吴海甫 周硕[1,2] 

机构地区：[1]长城汽车股份有限公司技术中心,河北保定071000 [2]河北省汽车工程技术研究中心

出　　处：《小型内燃机与车辆技术》2015年第3期33-37,共5页Small Internal Combustion Engine and Vehicle Technique

摘　　要：通过对2.0T GDI发动机进行试验,主要研究了分次喷射策略对GDI发动机中高速机油稀释的影响。试验结果表明,通过采用合理的分次喷射策略,可以改善油束在喷射过程中的碰壁情况,减少融入油膜中的汽油量,从而改善机油稀释问题,但是随着机油稀释问题的改善,发动机的烟度会出现恶化。With the test on 2.0T GDI engine, this paper mainly studies the effect of twice injection strategy of the oil dilution on GDI engine at mid-high speed. The test results show that by adopting reasonable twice injection strategy, the wall wetting can be improved in the injection process, and the amount of gasoline in the oil film also reduced, so as to improve oil dilution. But with the improvement of oil dilution, the soot will be deteriorated.

关 键 词：分次喷射 喷油时刻 机油稀释 缸内直喷 稀释速率 

分 类 号：TK414.11[动力工程及工程热物理—动力机械及工程]