四驱电动汽车再生制动力控制策略研究

Control strategy on regenerative braking force of four-wheel-drive electric vehicle

为提高四驱电动汽车制动能量回收效率,在分析再生制动系统的机械结构和约束条件下,制定了基于并联再生制动系统的固定比例分配策略和基于串联再生制动系统的理想制动力分配策略,定义了相关的再生制动力修正系数。在Simulink/Stateflow中建立了两种制动力分配策略及包括四驱车辆、电机、电池等的再生制动系统模型,通过不同车速、不同制动强度下的仿真分析,验证了两种制动控制策略的制动效果。仿真结果表明:采用合理的分配策略、改善电池的充电能力,可以提高四驱电动汽车的制动能量回收效率;两种制动控制策略均能很好地完成制动任务,且在制动能量回收效率方面,理想制动力分配策略要优于固定比例分配策略。

In order to improve the efficiency of four-wheel-driveelectric vehicle braking energy recovery,in the analysis of the mechanical structure and the restraint condition of the regenerative braking system,a fixed proportion allocation strategy based on the parallel regenerative braking system and an ideal braking force distribution strategy based on the series regenerative braking system was established,the relevant regenerative braking coefficient was defined.Two kinds of braking force distribution strategy and the model of regenerative braking system including four-wheel-drive vehicle,motor and battery in Simulink/Stateflow were established.The braking effect of the two kinds of braking control strategy through the simulation analysis of different speed and different braking intensity was verified.The simulation results indicate that using the reasonable force distribution strategy and improve the battery charging capacity can improve the energy recovery efficiency of the four-wheel-drive electric vehicle.These two kinds of brake control strategy can accomplish the task in braking very well,and in terms of braking energy recovery efficiency,the ideal braking force distribution strategy is better than the fixed rate allocation strategy.