基于ESC的电动汽车再生制动策略及能量回收

Regenerative Braking Strategy and Energy Recovery Analysis of Electric Vehicle Based on ESC

为了提高电动汽车制动过程的节能效果,构建了可以对电机回馈制动以及液压制动过程进行协调控制的方案,能够满足对车轮轮缸的协调控制效果。通过仿真测试发现,随着制动强度的变化,可实现电机回馈制动力与液压制动力间的良好协调,以此满足制动过程的控制要求,实现制动能量的高效回收。以电子稳定控制器(Electronic Stability Control⁃ler,ESC)实现的制动能量回收方案效率更高,并且随着制动减速度的降低变得更加显著。当车辆减速度为5m/s2时,液压与电机制动力同时发挥作用,实现协调控制的效果,且轮缸压力的调节功能,避免车轮发生抱死的情况。本方案可以达到更优的车辆控制性能,实现车辆制动能量的高效回收。可以使NDEC工况下的续驶里程提升9.35%,WLTP工况下上升37.2%,ECE工况下上升15.2%。

In order to improve the energy saving effect of electric vehicle braking process,a coordinated control scheme for motor feedback braking and hydraulic braking process was constructed,which could meet the coordinated control effect of wheel cylin⁃der.Through the simulation test,it is found that with the change of the braking strength,the good coordination between the feed⁃back braking force of the motor and the hydraulic braking force can be achieved,so as to meet the control requirements of the braking process and realize the efficient recovery of braking energy.The braking energy recovery scheme based on the Electronic Stability Controller(ESC)is more efficient and becomes more significant as the deceleration rate of braking decreases.When the ve⁃hicle deceleration is 5m/s2,the hydraulic and electric mechanism play a role at the same time to achieve the effect of coordinated control,and the wheel cylinder pressure adjustment function,to avoid the wheel locked situation.This scheme can achieve better vehicle control performance and realize efficient recovery of vehicle braking energy.It can increase the driving distance of NDEC by 9.35%,WLTP by 37.2%,ECE by 15.2%.