点火提前角对直喷汽油机微粒排放特性的影响

Influences of Ignition Advance Angle on GDI Engine Particulate Emission

针对直喷汽油机建立了试验台架及试验测控系统,研究了点火提前角对缸内燃烧和微粒排放粒径分布的影响规律。试验结果表明,在进气过程中喷油的均质燃烧模式下,点火提前角不影响排放微粒数量浓度分布曲线形状,随着点火的提前,缸内的最高压力、温度和放热率升高,而总微粒数量存在先增加后减少的趋势。

The control system and test bench for a gasoline direct Injection engine were built and the influence of ignition ad-vance angle on in-cylinder combustion and particulate size distribution were researched .The result showed that the curve shape of particulate number concentration was not influenced by the ignition advance angle under the homogeneous charge mode of fu-el injection in the intake process .With the ignition advance ,the peak in-cylinder pressure ,peak temperature and heat release rate increased ,but the particulate number increased first and then decreased .