Abstract:

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.

Key words: vehicles, regenerative braking, vacuum brake booster, piston-type adjustable cylinder reservoir