摘要
从低温反应动力学的角度出发,建立了一种可适用于低排温工况的可嵌入式模型,对选择性催化还原(SCR)系统氮氧化物(NOx)排放进行准确描述。基于上述研究,提出了一种基于模型的控制策略,并利用Matlab/Simulink软件建立后处理控制单元(DCU)标定平台,以加速SCR系统的标定过程。最后,通过世界统一(WHTC)循环进行验证。试验结果表明:采用新策略可获得高NOx转化效率,同时能降低氨气(NH3)的泄漏量。
Based on the analysis of SCR reaction kinetics at low-temperature, an embeddable SCR mod- el was presented, which can accurately quantify transient NO~ concentration from SCR system. Following that, a model-based control strategy was presented and a dosing control unit （DCU） calibration platform was established with Matlab/Simulink to accelerate calibration process. Finally, the World Harmonized Transi- ent Cycle tests （WHTC） were carried out. The result of the tests indicate that the control strategy presented here can achieve a better balance between high NO~ reduction efficiency and low ammonia （NH3） slip.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2014年第6期84-89,95,共7页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金重点项目(51379165)
湖北省自然科学基金重点项目(2012FFA105)
