基于离散小波变换的前轮独立驱动电动汽车等功率分配电子差速系统研究

针对永磁同步电机及电动汽车电子差速控制系统存在的问题,以前轮独立驱动电动汽车为研究对象,建立了一种基于离散小波变换的驱动轮等功率分配电子差速控制策略.基于永磁同步电机数学模型,设计了基于离散小波变换的电流控制器,并建立了驱动轮等功率分配电子差速控制策略,为了验证所提出控制策略的有效性,基于Matlab/Simulink和Carsim联合仿真平台,建立了基于离散小波变换的等功率分配电子差速控制策略模型,并与传统PID电流控制器及驱动轮等转矩分配策略进行对比,仿真结果表明,相比于PID电流控制器,基于离散小波变换的电流控制器具有更快的响应速度和较好的鲁棒性,与驱动轮等转矩分配策略相比,基于等功率分配的电子差速控制策略能够实现转矩间的不等分配,降低驱动轮滑转率,有效提高了车辆行驶稳定性与安全性.

Research of an Electronic Differential System Based on Discrete Wavelet Transform for Front Wheel Independent-Driven Electric Vehicles with Equal Power Distribution

By analyzing the existing problems of electronic differential control systems and the interior permanent magnet synchronous motor (IPMSM) of vehicles, an electronic differential control strategy of equal power allocation based on discrete wavelet transform was proposed for the front wheel independent-driven electric vehicle. Based on the mathematical model of IPMSM, a current controller was established with discrete wavelet transform, and the equal power allocation strategy was implemented. A simulation model was established on the co-simulation platform of Carsim/Simulink to verify the effectiveness of the proposed control strategy, and the differential performances and steering stability were analyzed and compared with the PID current controller and the equal torque allocation strategy. Simulation results showed that the discrete wavelet transform current controller had faster response rate and better robustness compared with the PID current controller and the electronic differential control strategy of equal power allocation reduced the slip rate due to the differential distribution of torque, thus improving the stability and safety of the vehicle.