喷油比对复合喷射汽油机暖机过程燃烧和排放的影响*

doi:10.19562/j.chinasae.qcgc.2020.06.002

Abstract

Abstract: A warm-up test of different injection schemes is carried out on a combined injection gasoline engine to study the effects of different injection ratios on the combustion and emission characteristics of the combined injection gasoline engine in warm-up process. The results show that with the rise of coolant temperature, the combustion and emission performances of the gasoline engine gradually improve. When injection ratio is 80%, the engine achieves the best performance, with the peak of cylinder pressure increases by 49.1%, HC emission decreases by 14.5%, CO emission reduces by 27.1%, NO_x emission rises by 56.6%, and PN emission lowers by 92.5% on average in warm-up process, compared with pure direct injection scheme. With the rise of coolant temperature in warm-up process, the combustion of engine improves, and the emissions of HC, CO and total particulates gradually reduce

Key words: gasoline engine, combined injection, warm-up process, combustion, emission

Sun Ping, Liu Ze, Liu Shaozhen, Yu Xiumin, Cao Zhi, Yang Song. Effect of Injection Ratio on Combustion and Emission ofCombined Injection Gasoline Engine During Warm-up Process[J].Automotive Engineering, 2020, 42(6): 718-724.

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Effect of Injection Ratio on Combustion and Emission ofCombined Injection Gasoline Engine During Warm-up Process

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