基于可调储液缸的再生制动电液分配控制策略

Electro-Hydraulic Distribution Control Strategy for Regenerative Braking Based on Adjustable Cylinder Reservoir

为满足低成本小型电动车的再生制动需求,本文提出了一种在传统真空助力制动系统的基础上增设一套活塞式可调储液缸的再生制动系统,并设计相应的电液分配控制策略。首先再生制动电液分配策略根据辨识的制动意图和再生制动力约束对再生制动力进行合理分配;其次设计踏板解耦决策策略,确定了可调储液缸不同的工作阶段和对应的目标活塞位移;最后采用双闭环可调储液缸控制策略完成精确的主动储液控制。基于dSPCAE搭建了实车试验平台进行算法测试,结果表明,设计的电液分配控制策略能保证该制动系统在0.15g以下的减速度范围内实现良好的再生制动电液协同控制效果。

In order to meet the regenerative braking requirements of low-cost small electric vehicles,a regenerative braking system with a piston-type adjustable cylinder reservoir is added on the basis of traditional vacuum brake booster in this paper,with a corresponding electro-hydraulic distribution control strategy devised.Firstly,the regenerative braking electro-hydraulic distribution strategy reasonably distributes the regenerative braking force according to the brake intention identified and the constraint of regenerative brake force;Then,a pedal decoupling decision strategy is devised,and the different working stages of adjustable reservoir and its corresponding reference piston displacement are determined;Finally,a dual closed-loop adjustable reservoir control strategy is adopted to complete accurate active reservoir control,and a real-vehicle test platform is built on dSPCAE with the algorithm test conducted.The results show that the electro-hydraulic distribution control strategy devised can ensure the brake system achieves a good results of electro-hydraulic coordinated control within the deceleration range of below 0.15g.