柴油机排气后处理系统CRT故障诊断研究  

Research on Fault Diagnosis of Exhaust After-treatment System CRT for Diesel Engine

作　　者：胡杰[1,2] 李泽西 林峰[1,2] 颜伏伍 刘志成[1,2] 

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点实验室,武汉430070 [2]汽车零部件技术湖北省协同创新中心,武汉430070

出　　处：《武汉理工大学学报（交通科学与工程版）》2017年第6期918-923,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目(51406140);校企合作项目资助

摘　　要：以柴油机排气后处理系统连续被动再生颗粒捕集器(CRT)为研究对象,建立GT-Power仿真模型,通过对比台架试验数据与仿真数据验证了模型的准确性.通过故障仿真,分析了氧化催化器(DOC)和催化型颗粒物捕集器(CDPF)不同程度的破损与堵塞对其两端温差和压差的影响.结果表明,压差参数对故障较为敏感.基于压差提出了参数K作为CRT系统的故障诊断参数,工况对参数K影响较小,在稳态和NEDC循环下验证了该参数对CRT系统破损和堵塞故障敏感,通过参数K能够判断出故障程度及破损、堵塞等故障类型.Taking the exhaust after-treatment system CRT（Continuously Regenerating Trap）of diesel engine as the research object,the simulation model of GT-Power was established and verified by comparing bench test data and simulation data.The fault simulation was carried out to analyze the influence of different degrees of damage and blockage on temperature and pressure difference between two ends of DOC（Diesel Oxidation Catalyst）and CDPF（Catalytic Diesel Particulate Filter）,The results show that the fault is sensitive to the pressure difference.Based on pressure difference,the parameter K was proposed as the fault diagnosis parameter of CRT system and the working condition has little effect on parameter K.Under the steady state and NEDC cycle,it is proved that the parameter Kis sensitive to the damage and blockage of CRT system.Kcan be used to judge the fault degree and fault types.

关 键 词：柴油机 CRT系统 仿真 故障诊断 

分 类 号：U464.172[机械工程—车辆工程]