摘要
针对Urea-SCR状态反馈控制系统存在不可测状态变量的问题,首先,分析了SCR系统的化学反应机理,为了描述SCR系统的分布参数特性,给出了包含上游-下游(主-从)两个单元的SCR系统双核动力学模型;其次,利用Urea-SCR系统下游氨浓度及氮氧化物浓度的测量值,设计了非线性降维观测器估计上游氨浓度、上下氨覆盖率等不可测的状态变量,同时在Lyapunov稳定性框架下,分析了观测器的稳定性,并据此给出了保证观测器稳定的观测器增益的取值范围;最后,在发动机动力学仿真软件enDYNA中,通过FTP75循环测试工况仿真测试,验证了该方法的有效性。
As one of the effective approaches to reduce NOxemission of diesel,Urea Selective Catalytic Reduction(Urea-SCR)can catalytically convert toxic NOx emission to nitrogen and water by accurately controlling the amount of ammonia injection.However,there still exists problem such as non-measurable states in Urea-SCR.To resolve this problem in the Urea-SCR feedback control system,first,the chemical reaction mechanism of DCR system is analyzed and a model containing both upstream and downstream(master-slave)elements is introduced.Second,a nonlinear reducedorder observer is designed to observe the non-measurable states by utilizing the concentration measurement downstream ammonia and NOx,meanwhile,the stability of the observer is analyzed and the value range of the observer parameter is calculated based on stability analysis.Finally,theeffectiveness of the proposed approach is testified by simulation in enDYNA employing FTP75 cycle test procedure.
作者
宫洵
蒋冰晶
胡云峰
曲婷
陈虹
GONG Nun;JIANG Bing-jing;HU Yun-feng;QU Ting;CHEN Hong(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China;Department of Control Science and Engineering,Jilin University,Changchun 130022,China;Department of Aerospace Engineering,Michigan University,Ann Arbo 48109,USA)
出处
《吉林大学学报(工学版)》
EI
CAS
CSCD
北大核心
2018年第4期1055-1062,共8页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(61703177)
吉林省教育厅项目(JJKH20170801KJ)
吉林省科技厅项目(20170520067JH
20180520200JH)