增压直喷汽油机冷起过程碳氢排放影响因素试验研究  

Influencing Factors of HC Emission during Cold Start for Turbocharged GDI Engine

作　　者：刘亚奇[1,2] 刘刚[1,2] 高定伟[1,2] 刘国军[1,2] 苏艳君[1,2] 

机构地区：[1]长城汽车股份有限公司技术中心,河北保定071000 [2]河北省汽车工程技术研究中心,河北保定071000

出　　处：《车用发动机》2014年第3期39-42,共4页Vehicle Engine

摘　　要：针对增压直喷汽油机的特点,进行了冷起动HC排放影响因素的探讨,研究过程采用试验与仿真相结合的方法,基于发动机试验台测试数据,重点分析了冷起动过程中空燃比、点火策略、缸内残余废气、喷油策略对HC排放的影响。分析结果表明:在发动机冷起动过程中,实现有效的稀燃和降低缸内残余废气有利于降低HC排放;适当的喷油策略可降低HC排放,但需要合理地组织发动机瞬态进气;发动机点火角提前有利于降低HC排放,但需要考虑整车三元催化器暖起过程。For the characteristics of turbocharged GDI engine ,the influencing factors of HC emission during cold start was discussed through test and simulation .Based on the measured data from test bench ,the influences of air-fuel ratio ,ignition strategy ,in-cylinder residual gas and injection strategy on HC emission were mainly analyzed during cold start .The results showed that the effective lean burn and in-cylinder residual gas reduction during cold start were beneficial to the HC reduction . The appropriate fuel injection strategy could reduce HC emission ,but the reasonable adjustment of transient intake was neces-sary .The advance of ignition timing was also helpful to reduce HC emission ,but the warming-up of vehicle three way catalysts should be considered .

关 键 词：汽油机 仿真 碳氢化合物 排放控制 

分 类 号：TK417.126[动力工程及工程热物理—动力机械及工程]