增压直喷汽油机部分负荷燃烧特性及影响因素研究

Research on Performance and Combustion of a Small Displacement Gasoline Direct Injection Turbocharger Engine and Influencing Factors

研究了一台小型增压直喷汽油机部分负荷燃烧特性,并且与一台较大排量的增压直喷发动机进行了对比分析,总结了燃烧规律和影响因素。研究结果表明点火正时、喷油正时对燃烧有显著影响;对于一定工况,存在唯一的最优燃烧相位,使有效燃油油耗率达到最低值;冷却能力是影响最佳燃烧相位的主要因素。

This paper shows the character of combustion of a small displacement gasoline direct injection engine at part load, and compares with another large displacement engine. The flowing conclusion can be obtained： 1,the combustion is infected by spark timing, injection timing and fuel pressure significantly; 2, the only best combustion phase exists for a certain operating condition; 3, cooling capability is one of the most important factors which influence the best combustion phases.