考虑道路识别的四驱电动汽车再生制动策略

Regenerative braking control strategy of four-wheel drive electric vehicle considering road identification

为了充分利用路面附着条件分配再生制动力,提高制动能量回收率,根据双电动机四驱结构电动汽车复合制动系统的特点,对其制动能量回收控制策略进行了研究.分析了驱动轮与地面附着特性,设计了道路识别器来计算每个轮胎与当前路面之间的峰值附着系数,并使用模糊控制策略确定每个车轮与8种道路的滑移率和附着利用率的相似输入.根据双电动机外部特性的制动力分配关系,提出了使更多制动能量回馈给电池的策略.结果表明:制动强度为0.3时,能量回收率为65.55%,具有较高的回收效率.

To make full use of road adhesion conditions for distributing regenerative braking force and improving braking energy recovery,the braking energy recovery control strategy of dual-motor four-drive electric vehicle composite braking system was investigated according to the braking system characteristics.A road identifier was designed to calculate the peak adhesion coefficient between each tire and the current road surface,and a fuzzy control strategy was used to determine the similar input of slip rate and adhesion utilization ratio between each wheel and 8 kinds of roads.According to the braking force distribution relationship of the external characteristics of dual motors,a strategy was proposed to make more braking energy return to the battery.The results show that when the braking intensity is 0.3,the energy recovery rate is 65.55%,which has high recovery efficiency.