基于动态轴荷的电动汽车再生制动策略研究

Research on Electric Vehicle Regenerative Braking Strategy Based on Dynamic Axle Load

基于弹簧弹性与位移的非线性关系,建立了具有非线性悬架的7自由度整车模型,提出一种基于悬架变形的车轮动态轴荷计算方法和基于最佳滑移的路面附着系数计算方法,利用车轮动态轴荷和路面附着系数计算前、后车轮制动力。建立了以制动强度、车速和电池荷电状态(SOC)作为输入变量,期望的再生制动力作为输出变量的模糊逻辑控制模型,并在ADVISOR中开展仿真。结果表明,所设计的控制策略在保证制动稳定性的同时提高了再生制动能量的回收效率,验证了该控制策略的可行性。

Based on the nonlinear relationship between spring elasticity and displacement,a 7-degree-of-freedom vehicle model with a nonlinear suspension is established.This paper proposes a method for calculating dynamic axle load based on suspension deformation and a method for calculating road adhesion coefficient based on optimal slip.Wheel dynamic axle load and road adhesion coefficient are used to calculate the front and rear wheel braking forces.A fuzzy logic control model with braking strength,vehicle speed and battery State-Of-Charge(SOC)as input variables and the expected regenerative braking force as output variables is established and simulated in ADVISOR software.The results show that the designed control strategy improves the recovery efficiency of regenerative braking energy while ensuring braking stability,its feasibility is also verified.