早期排气道EGR策略CAI燃烧方式和SI燃烧方式的模拟及比较  

Simulation and Comparison of CAI Combustion Mode Based on Early Exhaust Duct EGR and SI Combustion Mode

作　　者：高印寒[1] 郝英凯 程鹏[1] 谷艳华[3] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,吉林长春130025 [2]吉林大学仪器科学与电气工程学院,吉林长春130026 [3]吉林大学机械科学与工程学院,吉林长春130025

出　　处：《车用发动机》2014年第2期57-61,共5页Vehicle Engine

摘　　要：利用GT-Power和Chemkin软件建立了采用早期排气道EGR策略的汽油机模型。利用该模型分析了早期排气道EGR策略中排气门关闭角、进气门关闭角、进气门开启角对EGR率的影响;分析了相同机型采用SI燃烧方式时进气门晚关角和排气门晚关角对容积效率的影响;对比了CAI燃烧方式(采用早期排气道EGR策略)和SI燃烧方式(经过气门相位优化后)发动机的动力性、经济性。计算结果表明:进气门关闭角对EGR率的影响很小;排气门关闭角和进气门开启角在不同定时区域对EGR率起到不同程度的影响;只有EGR率较低时,发动机采用CAI燃烧方式的动力性、经济性才优于采用SI燃烧方式时,随着EGR率的升高,发动机的动力性、经济性越来越差。The gasoline engine model of early exhaust duct EGR strategy was built with GT-Power and Chemkin software. With the model,the influences of exhaust valve closing（EVC）angle,intake valve closing（IVC）angle and intake valve opening（IVO）angle on EGR rate were analyzed.The influences of intake valve late closing angle and exhaust valve late closing angle on volumetric efficiency in SI combustion mode were analyzed.And the engine power and economy under CAI combustion mode（with early exhaust duct EGR）and SI combustion mode（after optimization of valve timing）were compared.The results show that the IVC angle has a little influence on EGR rate.The EVC angle and IVO angle have different influences on EGR rate in different regions.Only when EGR rate is low,the power and economy of CAI combustion mode are superior to that of SI combustion mode.With the increase of EGR rate,the power and economy become worse.

关 键 词：可控自燃 火花点燃 配气相位 废气再循环 数值模拟 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]