基于电机最优回馈转矩曲线的制动控制策略

本文中首先基于电机等效电路模型,分析了车用内置式永磁同步电机的耗能制动状态和回馈制动状态;然后根据电机矢量控制原理,对控制电流指令进行解析,并经试验数据的验证;接着计算得到永磁同步电机最优回馈转矩曲线,并据此提出一种制动回馈能量最优的串联制动控制策略。最后针对某P4并联混合动力商用车,仿真分析了在C?WTVC、CHTC?TT循环工况和试验采集到的某段省道工况下,并联制动和所提出的串联最优制动控制策略下的百公里油耗和制动回收能量。结果表明,与并联制动控制相比,基于电机最优回馈转矩曲线的串联制动控制策略可降低油耗,并回收更多的制动能量,实现制动回收能量和燃油经济性的提升。

Braking Control Strategy Based on Optimal Regenerative Braking Torque Curve of Motor

In this paper,the energy?consuming braking state and the regenerative braking state of a built?in PMSM are analyzed first based on the equivalent circuit model of the motor.Then the control current instruction of the motor is analytically analyzed according to the principle of motor vector control and is verified by test data.Next,the optimal regenerative torque curve of PMSM is calculated,and based on which an optimal series braking control strategy for regenerative braking is proposed.Finally,a simulation is conducted to acquire the L/100km fuel consumption and the energy recovered by regenerative braking of a P4 parallel hybrid electric commercial vehicle under C?WTVC,CHTC?TT and a section driving cycle of provincial road with both the parallel braking control and the optimal series braking control strategy.The results show that compared with parallel braking control,the series braking control strategy based on the optimal regenerative torque curve of the motor can reduce fuel consumption and recover more braking energy,achieving the enhancement of braking energy recovery and fuel economy.