DPF捕集效率故障诊断方法研究  

Research on Fault Diagnosis Method of DPF Capture Efficiency

作　　者：周文瑾 郑春芳 白晓鑫 Zhou Wen-jin;Zheng Chun-fang;Bai Xiao-xin(China Automotive Technology&Research Tianjin Center Co.Ltd,Tianjin 300300)

机构地区：[1]中汽研汽车检验中心(天津)有限公司,天津300300

出　　处：《内燃机与配件》2023年第20期16-18,共3页Internal Combustion Engine & Parts

摘　　要：随着全球排放法规的加严,柴油机对颗粒物排放的要求越来越高。目前,重型柴油机主要采用DPF(柴油机颗粒过滤器或颗粒捕集器)来减少排气中颗粒物排放。根据国六排放法规,柴油机后处理带有DPF时,必需对DPF捕集效率故障进行诊断。本文以采用BOSCH系统的某款重型柴油机为研究对象,通过分析颗粒物传感器和DPF压差传感器不同故障诊断策略,基于WHTC循环探究这两种诊断策略对DPF捕集效率故障判定的适用工况。研究发现,压差传感器法监测DPM捕集效率故障只适用于在高负荷工况与DPF堵塞故障监测及无故障车辆区分度较大的发动机,颗粒物传感器法测DPF捕集效率故障适用于绝大多数工况。With the tightening of global emission regulations,diesel engines have higher and higher requirements for PM emissions.At present,heavy-duty diesel engines mainly adopts DPF(Diesel Particle Filter or Particle Catcher) to purify particulate matter in exhaust.According to the sixth National Regulations,DPF capture efficiency fault diagnosis is required.In this paper,we takes a heavy-duty diesel engine on the BOSCH platform as the research object,analyzes the different fault diagnosis strategies of particulate matter sensor and DPF pressure differential sensor,explores the application conditions of these two diagnosis strategies to the fault determination of DPF capture efficiency based on WHTC cycle.It is found that the differential pressure sensor method is only applicable to the engine with high load condition and DPF clogging fault monitoring,and the engine with large distinction between fault-free vehicles,while the particle sensor method is applicable to most working conditions.

关 键 词：DPF捕集效率 压差传感器 OBD诊断 

分 类 号：TK428[动力工程及工程热物理—动力机械及工程]