孙雪迎，苏方旭，梁呈兴.二次燃油喷射对自吸直喷汽油机低速性能影响的试验研究[J].内燃机工程,2018,39(1):29-33.
二次燃油喷射对自吸直喷汽油机低速性能影响的试验研究
Experimental Investigation into Influence of Split Injection on Low Speed Performance of Gasoline Direct Injection Engine
DOI：
关键词:自吸直喷汽油机  低速性能  二次喷射
Key Words:gasoline direct injection engine  low speed performance  split injection
基金项目:
作者单位
孙雪迎，苏方旭，梁呈兴 北京汽车动力总成有限公司，北京 101106 
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摘要:摘要：对一台自吸直喷汽油机采用不同的燃油喷射模式在2 000 r/min全负荷工况进行试验，研究了二次喷射对发动机低速动力性和经济性的影响，并根据缸压参数、燃烧参数及排放物的变化规律对二次喷射影响发动机低速性能的机理进行了探讨。结果表明，相比单次喷射，通过优化二次喷射时刻可以使动力性提升5%，经济性提升约6%。二次喷射的优化机理主要是实现了燃烧室内油气浓度的不均匀分布，可提升燃烧速度，通过分层燃烧实现动力性和油耗的改善。
Abstract:The influence of split injection on the low speed performance of gasoline direct injection(GDI) engine was researched experimentally with full load at the operating point of 2000r/min using a series of injection modules, focusing on the effect of split injection on power and fuel economy. And the mechanism of the effect of split injection on the engine performance at low speed was investigated by analyzing the changes of cylinder pressure, combustion and emissions. The result indicates the optimized split injection generating the stratified stoichiometric mixture in the combustion chamber can accelerate the flame propagation, and improve the power and fuel economy by 5% and 6% respectively.
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