冷热 EGR 系统对点火式发动机性能影响的模拟研究

摘要

With AVL_BOOST, a one-dimensional engine model of Ricardo E6 gasoline engine with hot/cool EGR application was built.The model is verified by the combustion pressure data of engine experiments.And the effects of EGR on the combustion pressure, intake air mass, torque, fuel consumption are analyzed in this pa-per.The results show that with the increased EGR rates, both the mass flow of intake air and engine torque de-creased, especially with the hot EGR.When the EGR rate was less than 10%, brake specific fuel consumption ( BSFC) increased slightly.In the opposite, as the EGR rate increased, BSFC increased significantly.%使用AVL＿BOOST仿真软件，针对里卡多E6汽油机建立应用冷热EGR的一维燃烧模型，并通过发动机试验得到的燃烧压力进行验证，在此基础上分析冷热EGR对燃烧压力、进气质量、扭矩、比油耗的影响。结果表明，随着EGR率的提高，进气空气量、扭矩下降，采用热EGR时下降幅度更为明显；比油耗在EGR率小于10％时，略有改善，比油耗在EGR率大于10％时，随着EGR率的增大，比油耗剧增。