应用微分Petri网分析汽车再生制动模式的切换

Mode-change analysis of regenerative braking based on differential Petri net

针对混合动力汽车再生制动模式切换过程中引起的混杂系统的动态变化难以控制的问题,利用混杂系统理论,分析了混合动力汽车制动过程中的离散事件和连续状态变量对再生制动模式切换的影响.基于给定的再生制动控制策略,建立了再生制动混杂系统的微分Petri网模型,在以往建模方法的基础上增加了对离散事件的单独刻画,实现了对再生制动过程中的离散事件和连续状态变量的综合建模.通过Matlab/Simulink/Stateflow建立再生制动数学模型,实现了对再生制动过程中离散事件和连续状态变量的综合仿真,完成了再生制动模式判断和模式切换过程,结果表明微分Petri网用于再生制动混杂系统建模是合理和可行的.

In order to overcome the difficulties in controlling the dynamic change of hybrid system in regenerative braking mode-change of hybrid vehicle,based on the theory of hybrid system,discrete events and continous variable effects on regenerative braking mode-change were analysed when hybrid electic vehicles were in braking.According to the given control rules of regenerative braking,a differential Petri net model of regenerative braking hybrid system was established and a detail description of the vehicle′s regenerative braking system was added.Discrete events and continuous variables were co-modeled.The simulation model was established on Matlab/Simulink/Stateflow software.Co-simulation,mode-judgment and mode-change were realized.Results show that differential Petri net is reasonalbe and valid for establishing models of regenerative braking hybrid system.