后轮驱动电动汽车双电液再生制动系统协同控制

Cooperative control of dual electro-hydraulic regenerative braking system for rear wheel drive electric vehicle

为了解决汽车制动过程能量回收效率和制动稳定性的矛盾,以后轮驱动电动汽车为研究对象,提出了一种双电液再生制动系统协同控制方法,研究了再生制动力和液压制动力的协同制动、精确控制问题。建立了基于I曲线对理想制动力分配模型,分析了后轮双制动系统力矩分配策略,确定了再生制动转矩与后轮制动压力转换关系,最后开展了道路试验。结果表明:制动力最大跟踪误差为9.1%,整个制动阶段制动力跟踪误差较小,回收的能量约为9.12 kJ,总动能约为15.6 kJ,验证了所提出制动系统协同控制的可行性。

To solve the contradiction between energy recovery efficiency and braking stability in the automobile braking process,this paper proposes a cooperative control method of dual electrohydraulic regenerative braking system for the electric vehicle with wheel drive as the object,and studies the cooperative braking and precise control of regenerative braking force and hydraulic braking force.An ideal braking force distribution model based on I-curve is established,the torque distribution strategy of the double brake system of the rear wheel is analyzed,the relationship between the regenerative braking torque and the braking pressure of the rear wheel is determined,and finally the road test is carried out.The results show that the maximum tracking error of the braking force is 9.1%,the tracking error of the braking force in the whole braking stage is small,the recovered energy is about 9.12 kJ,and the total kinetic energy is about 15.6 kJ.The feasibility of the proposed collaborative control of the braking system is verified.