王国仰，张俊，祁金柱，刘世宇，肖建华，帅石金.重型柴油车尿素SCR系统及其控制策略研究进展[J].内燃机工程,2018,39(6):1-10.
重型柴油车尿素SCR系统及其控制策略研究进展
Development of Status of Urea SCR System and Control Strategy for Heavy-Duty Diesel Vehicles
DOI：10.13949/j.cnki.nrjgc.2018.06.001
关键词:重型柴油机  后处理  氮氧化物  选择性催化还原  控制策略
Key Words:heavy duty diesel engine  aftertreatment  nitrogen oxides  selective catalytic reduction（SCR）  control strategy
基金项目:国家重点研发计划（2018YFB0106402，2017YFC0211105）
作者单位
王国仰，张俊，祁金柱，刘世宇，肖建华，帅石金 1.山东大学 能源与动力工程学院，济南 250061； 2.清华大学 汽车安全与节能国家重点实验室，北京 100084 
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摘要:对选择性催化还原（SCR）系统工作原理进行了介绍；提出了DeNOx系统催化器集成方案；分析了SCR控制系统面临的主要问题；重点介绍了传统SCR控制技术和先进的SCR控制技术，分析了不同控制方法的优缺点。已有研究结果表明：SCR控制系统主要面临SCR模型非线性问题、多时间尺度耦合控制问题、商业传感器测量问题。开环控制系统NOx转化效率可以达到60%~80%，仅满足国Ⅳ和国Ⅴ排放法规要求。而闭环控制系统具有更高的NOx转化效率，可以满足更为严格的排放法规要求。先进SCR控制技术具有良好的控制效果和鲁棒性，能更有效地控制NOx排放和NH3泄漏。发动机和后处理系统协同控制增加了后处理系统的可控性，可以进一步降低柴油车污染物排放。
Abstract:According to the working principle of selective catalytic reduction(SCR) system, the catalyst integration scheme of DeNOx system was described. Focusing on the main problems faced by SCR control system, the advantages and disadvantages of traditional and advanced SCR control systems were highlighted. Research results show that the main problems faced by the SCR control systems are the nonlinear characteristics of the SCR model, the coupled control with multi-time scales and the reliability of commercial sensors used in the harsh environment. The NOx conversion efficiency of the open loop control system can reach 60%~80%, only meeting the requirements of China's CN Ⅳ and CN Ⅴ emission regulations. The closed-loop control system has a higher NOx conversion efficiency and can meet more stringent emission regulations. Advanced SCR control technology has good control effect and robustness, and can more effectively control NOx emissions and NH3 slip. In addition, the coordinated control of the engine and its aftertreatment system increases the controllability, which can further reduce the pollutant emissions from diesel vehicles.
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