基于电机特性的电动汽车制动力分配策略研究

Study on the Assignment Strategy of Brake Force of Electric Vehicle based on Motor Characteristic

为提高电动汽车制动能量的回收,提出一种根据电机转矩特性分配电动汽车前、后轴制动力的控制策略。在提出的分配策略基础上建立了制动能量系统仿真模型,并分别在MATLAB/Simulink和AVL-Cruise环境下进行了仿真分析。研究结果表明,电机特性制动力分配策略,能够满足制动法规的要求;与传统按I曲线分配前、后轴制动力的控制策略相比,能更充分地利用电机制动力。仿真结果表明,在NEDC法规循环工况下,能量回收提高了55.6%,能量回收率提高5.3%。

To heighten electric vehicle recovery energy, a brake - force assignment strategy based on motor torque characteristic is proposed from the viewpoint of maximum energy recovery. The model of regenerative energy sys- tem is established and simulated on MATLAB/Simulink and AVL- Cruise. The result shows the regenerative energy system meets braking stability and regulations requirement with the adoption of the strategy. Compared with the ideal front and rear braking force assignment, the proposed strategy is enables to take advantage of motor torque, the simula- tion results show that it enhances motor regenerative energy and improvement rate by 55.6% and 5.3 % for the NEDC driving cycle.