柴油车尿素溶液品质在线检测方法研究  

Research on Online Detection Method for Urea Solution Quality of Diesel Vehicle

作　　者：白晓鑫 吴春玲 刘卫林 景晓军 杨永真 李旭 BAI Xiaoxin;WU Chunling;LIU Weilin;JING Xiaojun;YANG Yongzhen;LI Xu(CATARC Automotive Test Center(Tianjin)Company Limited,Tianjin 300300,China;School of Mechanical Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]中汽研汽车检验中心(天津)有限公司,天津300300 [2]天津大学机械工程学院,天津300072

出　　处：《汽车实用技术》2024年第12期89-94,共6页Automobile Applied Technology

基　　金：国家重点研发计划基金项目(2022YFC3703600)。

摘　　要：选择性催化还原(SCR)是目前满足柴油机排放法规的主流后处理技术。在SCR系统中,尿素水溶液被用作将NOX转化为N2的还原剂,以确保发动机排放达到法规标准。为了实现发动机排放的实时监测,保证尿素品质满足要求,提出了一种基于车载诊断(OBD)系统数据的柴油车尿素溶液品质检测方法。通过对国六柴油车SCR系统工作原理和尿素喷射量计算方法的深入分析,提出了基于NH3影响偏差因子的尿素品质检测方法。通过对一辆柴油车添加三种不同浓度尿素溶液进行实际道路行驶测试,验证了该方法的可行性。结果表明,所提方法能够有效检测尿素品质,并为发动机排放的实时控制提供了可靠的数据支持。Selective catalytic reduction(SCR)is a widely adopted technology for reprocessing diesel emissions to comply with regulations.In SCR systems,an aqueous urea solution acts as a reducing agent to convert NOX into N2,ensuring that engine emissions meet regulatory standards.To achieve real-time monitoring of engine emissions and ensure the quality of urea meets requirements,this paper presents a method for detecting the quality of urea solution in diesel vehicles based on on-board diagnostic(OBD)system data.By thoroughly analyzing the working principle of SCR systems and the calculation method for urea injection quantity,a detection method for urea quality based on NH3 influence deviation factor is established.The feasibility of this approach is verified through actual road tests involving three different concentrations of urea solution added to a diesel vehicle.The results demonstrates that proposed method can effectively detect urea quality and provide reliable data support for real-time control of engine emissions.

关 键 词：车载诊断系统 SCR 尿素溶液品质 检测方法 

分 类 号：U473.9[机械工程—车辆工程] U464[交通运输工程—载运工具运用工程]