面向控制的SCR催化转化器温度模型

摘要

To establish a control-oriented temperature model for SCR catalytic converter,four types of SCR catalyst temperature models were built and graphical calculation models were constructed using Matlab/Simulink according to the energy conservation and mass conservation equations and considering different heat transfer processes involved in thermal balance.The models were checked based on the measured data on a test bench under European Stationary Cycle (ESC) and European Transient Cycle (ETC) and evaluated based on the parameters of maximum dispersion degree,fitting degree and calculation time.The results show that the temperature model has a good prediction accuracy and real-time performance due to considering the convective heat transfer between the catalytic converter and the exhaust gas as well as the surrounding environment and therefore is more suitable for the SCR control strategy.%为了建立面向控制的SCR催化器温度模型,根据能量守恒和质量守恒方程并考虑热平衡中所涉及的换热过程不同,建立了4种SCR催化器温度的数学模型,并利用Matlab/Simulink构建图形化的计算模型.采用柴油机欧洲稳态循环(ESC)和欧洲瞬态循环(ETC)条件下的台架实测数据对模型进行检验,基于最大离散程度、拟合度和计算时间3个指标对模型进行评价和比较.结果表明,考虑催化器与废气和周围环境对流换热的温度模型具有良好的预测精度和实时性,更适合用于SCR控制策略.