CAJ | 학술논문

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N H3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N H3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 U rea-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N H3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。
위유효강저NOx 배방화NH3설루량，제출료기우NOx 화NH3전감기적시유궤SCR쌍폐배공제계통，실현료대최화전화기내부적N H3흡부、해흡부여복개속솔적우합공제。기우최화전화기내부적N H3활화모형，제정료뇨소SCR계통쌍폐배우합공제책략，제출료뇨소분사량화저안량적수정산법，유효지제고료 U rea-SCR쌍폐배계통적공제정도화로봉성。의거시유궤ESC화ETC순배측시법규，진행료NOx 전화효솔、뇨소분사량、NH3설루화배방체표등시험。결과표명：해시유궤SCR쌍폐배공제계통유효해결료N H3농도공제신호연지문제，성능가고，공제정도고，시유궤NOx 배방화NH3설루량체도국Ⅴ배방표준。
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 .