柴油机选择性催化还原系统NOx传感器的NH3交叉敏感性研究  

Study on NH3 Cross Sensitivity of NOx Sensor in Diesel Engine SCR System

作　　者：钱枫[1] 孙金博 马冬 李朋[3] 祝能 Qian Feng;Sun Jinbo;Ma Dong;Li Peng;Zhu Neng(Wuhan University of Science and Technology,Wuhan 430081;Tsinghua University,Beijing 100084;Key Laboratory of High Performance Ship of Ministry of Education,Wuhan University of Technology,Wuhan 430063)

机构地区：[1]武汉科技大学,武汉430081 [2]清华大学,北京100084 [3]武汉理工大学,高性能船舶教育部重点实验室,武汉430063

出　　处：《汽车技术》2020年第9期52-56,共5页Automobile Technology

摘　　要：针对选择性催化还原(SCR)系统中NOx传感器对NH3的交叉敏感性问题,通过对发动机台架试验数据进行分析,研究了排气温度、氨氮比和空速3个因素对传感器交叉灵敏度的影响,建立了与3个影响因素相关的SCR催化剂反应模型,提出了一种SCR催化剂下游NOx排放水平和NH3泄漏量的预测方法。Simulink仿真与发动机台架试验结果表明,该方法在一定程度上可有效预测NOx传感器的准确性。Aiming at the cross-sensitivity of NOx sensor to NH3 in Selective Catalytic Reduction(SCR)System,the influence of exhaust temperature,ammonia nitrogen-ratio and space velocity on cross sensitivity of the sensor is studied by analyzing engine bench test data,and the SCR catalyst reaction model is established related to above 3 influencing factors.A method is proposed to predict NOx emission levels and NH3 leakage in the downstream of SCR catalysts.The comparison between Simulink results and engine bench test results shows that this method can predict the accuracy of NOx sensor reading to some extent.

关 键 词：选择性还原 NOX传感器 交叉敏感性 催化剂反应模型 

分 类 号：U464[机械工程—车辆工程] TK427[交通运输工程—载运工具运用工程]