董鹏，尹乾熙，刘宇

（吉林大学 汽车仿真与控制国家重点实验室，吉林 长春 130022）

摘要：缸内直喷汽油机混合气形成方式与柴油机类似,均在燃烧室内喷入燃油形成混合气。该特点决定了其尾气中存在相对较多的微粒。作为处理发动机尾气中微粒的一种有效方式,加装微粒捕集器可以明显降低整车微粒排放。本文结合发动机台架试验结果针对性地运用GT-POWER仿真软件对微粒捕集器结构参数进行仿真优化,分析了微粒捕集器载体孔隙率和微孔平均直径等参数对微粒捕集过程的影响。优化后的载体具有较高的微粒捕集效率,并且具有较低的排气背压。为深入研究微粒捕集器微粒捕集过程和产品设计开发奠定理论基础。

关键词：缸内直喷汽油机；微粒捕集器；微粒排放

Abstract：The mixture gas of gasoline direct injection engines is formulated in a similar way as diesel engines, injecting fuel into the combustion chambers to form the mixture gas. This feature determines the presence of a relatively large number of particles in the GDI engine exhaust. As an effective way to deal with engine exhaust particulates, particulate filters can effectively control the vehicle particulate emission. According to experiment results, this paper mainly studied the structural parameters optimization and simulation of gasoline particulate filters by using GT-POWER. The optimized carrier has high particle trap efficiency and low back pressure. Meanwhile, the simulation on how the porosity and average pore diameter effects on the trapping process was done. And it is a basis to understand the particle trapping process and design and develop this product

Keywords：GDI Engine;Gasoline Particulate Filter;Particulate Emission