各缸废气再循环率不均匀性对柴油机排放影响的试验研究  

Experimental Study on Influence of Unevenness of Exhaust Gas Recirculation Rates Among Cylinders on Diesel Engine Emissions

作　　者：刘志恩[1] 朱启涛 刘惟伊 陈弯 郑巍[2] 唐巨惠 LIU Zhien;ZHU Qitao;LIU Weiyi;CHEN Wan;ZHENG Wei;TANG Jühui(Hubei Key Laboratory of Advanced Technology for Automotive Components(Wuhan University of Technology),Wuhan 430070,China;National Automobile Quality Supervision and Test Center(Xiangyang),Xiangyang 441004,China)

机构地区：[1]现代汽车零部件技术湖北省重点实验室(武汉理工大学),武汉430070 [2]国家汽车质量监督检验中心(襄阳),襄阳441004

出　　处：《内燃机工程》2020年第5期16-22,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家重点研发计划项目(2018YFB0106401);新能源汽车科学与关键技术学科创新引智基地项目(B17034)。

摘　　要：针对一台由国五升级到国六的重型柴油机原始排放(无后处理系统)超过目标设定值的问题进行研究,提出了一种通过控制各缸废气再循环(exhaust gas recirculation,EGR)率不均匀性来降低柴油机原始排放的方法。建立了柴油机各缸EGR率不均匀性的排放测试试验台架和测试方法,通过分析排放万有特性曲线图确定所研究的进气总管EGR率和柴油机运行工况点,用CO 2法在稳态工况下测量各缸EGR率,分析各缸EGR率不均匀对排放性能的影响,确定了达到企业原始排放目标设定值的各缸EGR率不均匀性范围,实现了通过控制各缸EGR率不均匀性来降低柴油机原始排放及降低满足国六排放法规后处理系统匹配难度和成本的目的。A Study was conducted on the raw emissions of a heavy-duty diesel engine,which was in the process of upgraded from ChinaⅤcompliance to ChinaⅥcompliance and the raw emissions of which exceeded the target set by the enterprise.A method was proposed to reduce the raw emissions by controlling the unevenness of the exhaust gas recirculation(EGR)rate of each cylinder.The emissions test system and methodology were established for testing the unevenness of the EGR rates among cylinders of the diesel engine.The EGR rates in the intake manifold and the engine operating conditions were determined by analyzing the universal emissions characteristic curves.The EGR rate of each cylinder was explored by measuring CO 2 concentrations under steady-state conditions,the influence of uneven EGR rate of each cylinder on the emissions performance was analyzed,and the range was determined of difference of the EGR rate of each cylinder by which the set raw emissions target can be reached.The purposes were satisfied of reducing the raw emissions of the diesel engine and alleviating the difficulty and cost of matching an after-treatment system to meet the emissions requirements of ChinaⅥby controlling the difference of the EGR rate of each cylinder.

关 键 词：排放 废气再循环 不均匀性 重型柴油机 

分 类 号：TK421+.5[动力工程及工程热物理—动力机械及工程]