基于实际工况的LPG发动机排放控制参数优化  

Optimization of Emissions Control Parameters for LPG Engine under Practical Road Conditions

作　　者：张忠波 李礼夫[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641

出　　处：《内燃机工程》2017年第5期34-40,共7页Chinese Internal Combustion Engine Engineering

基　　金：广东省交通厅科技项目(201104008)~~

摘　　要：为减少发动机在实际工况中的污染物排放量,以广州市城市公交客车用典型(LPG)发动机为研究对象,结合广州市实际道路工况特点,通过台架试验分析了该发动机的排放性;根据发动机工况、排放控制参数与排放性之间的关系,通过试验设计,建立了该发动机统计学数学模型,结合多目标优化算法,对其主要排放控制参数进行了优化;将优化前后的控制参数分别导入LPG发动机一维仿真模型中,进行了广州市典型道路工况下的性能仿真试验。仿真试验结果对比表明:试验工况下,排放控制参数优化后,LPG发动机HC、CO累计排放量分别减少9.5%、21.0%,转矩最大增加22.6%,但NO累计排放量增加2.7%。To reduce emissions of LPG engines in practical conditions, a typical LPG engine used for Guangzhou bus was taken as the research object and its emission characteristics were studied through a bench test system considering practical road conditions. With the relationship among engine emissions, emission control parameters and emission characteristics as a basis and by design of experiments （DoE） , a statistics mathematical model of the engine was established, with which main emission control parameters were optimized combining with multi-objective optimization. The control parameters before and after optimization were input into the one-dimensional simulation model of the LPG engine to carry out engine performance simulation. The results show that after the optimization of the main control parameters, the HC and CO from the engine under experimental conditions are accumulatively reduced by 9. 5% and 21. 0% respectively and the maximum increase in torque is by 22. 6 % , but the accumulated emission of NO is increased by 2. 7 %.

关 键 词：LPG发动机 实际工况 排放 控制参数 多目标优化 

分 类 号：TK431[动力工程及工程热物理—动力机械及工程]