摘要
基于GT-Power软件建立了YC4E170—31涡轮增压柴油机的稳态仿真模型,利用试验数据对稳态仿真模型进行了校核,通过建立一些关键参数随工况变化的MAP图,实现了稳态模型向动态模型的转换。利用构建的动态仿真模型进行了带废气再循环(EGR)柴油机恒定转速递增扭矩工况下的瞬态仿真研究。结果表明:恒定转速递增扭矩工况下,由于进气响应滞后,造成空燃比下降,排烟恶化;进气氧气质量分数与NOx排放的相关程度高于EGR率;相同EGR阀开度下,相对于稳态工况EGR率有大幅度超调;由于进气状态发生变化,传统的EGR控制方式在瞬态工况下已不再适用,需制订相应的EGR瞬态控制策略。
The steady simulation model of YC4E170-31 turbocharger diesel engine was built with GT-Power software and was calibrated with experimental data. The transformation of steady model to transient model was realized by constructing Maps of some key parameters with operating conditions. With the transient model, the simulation of load increase at constant speed was carried out on a turbocharged diesel engine with EGR. The results show the exhaust deteriorates due to the decrease of air-fuel ratio caused by the lag of turbocharger under the transient condition. The oxygen mass fraction in the intake has a greater influ- ence on NOx emission than EGR rate. For the same opening of EGR valve, the EGR rate overshoots under transient conditions compared with steady conditions. It is necessary to develop a new EGR control strategy in transient conditions substituting for the unfavorable conventional EGR control methods due to the intake state changes.
出处
《车用发动机》
北大核心
2013年第5期17-21,共5页
Vehicle Engine
基金
部委重点基础研究计划项目(DEDP1004)
关键词
柴油机
废气再循环
瞬态工况
排放
控制策略
diesel engine
exhaust gas recirculation
transient condition
emission
control strategy
