柴油机Urea-SCR系统耦合控制研究  

Research on Coupling Control Urea-SCR System for Diesel Engine

作　　者：胡明江[1] 

机构地区：[1]河南城建学院能源与建筑环境工程学院,河南平顶山467036

出　　处：《车用发动机》2014年第1期74-77,81,共5页Vehicle Engine

基　　金：河南省高等学校青年骨干教师资助项目(2010GGJS-150);河南省科技厅重点攻关计划项目(112102210363)

摘　　要：为有效降低NOx排放和NH3泄漏量,提出了基于NOx和NH3传感器的柴油机SCR双闭环控制系统,实现了对催化转化器内部的NH3吸附、解吸附与覆盖速率的耦合控制。基于催化转化器内部的NH3活化模型,制定了尿素SCR系统双闭环耦合控制策略,提出了尿素喷射量和储氨量的修正算法,有效地提高了Urea-SCR双闭环系统的控制精度和鲁棒性。依据柴油机ESC和ETC循环测试法规,进行了NOx转化效率、尿素喷射量、NH3泄漏和排放达标等试验。结果表明:该柴油机SCR双闭环控制系统有效解决了NH3浓度控制信号延迟问题,性能可靠,控制精度高,柴油机NOx排放和NH3泄漏量达到国Ⅴ排放标准。In order to reduce the NO x emissions and NH3 leakage effectively ,the double closed-loop control of urea-SCR sys-tem for diesel engine was proposed based on the NOx and NH3 sensors and the coupling control of NH3 adsorption ,desorption and coverage rate in the catalytic converter was realized .Based on the NH3 active model ,the control strategies of urea-SCR double closed-loop control were determined ,the correction methods of urea injection quantity and ammonia storage quantity were put forward ,and the control accuracy and robustness improved effectively .According to the ESC and ETC regulations , the experiments of NOx conversion efficiency ,urea injection amount ,NH3 leakage and emission certification were carried out . The results show that the double closed-loop control of urea-SCR system can solve the delay of NH3 control signal and has reli-able performance and good control accuracy .Accordingly ,the NOx emission and NH3 leakage can meet state V standard with the control method .

关 键 词：柴油机 闭环控制 选择性催化还原 控制策略 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]