A novel fore axle whole-turning driving and control system for direct-wheel-driven electric vehicle

Based on comprehensive analysis of differential principle, a novel driving and control system for a direct-wheel-driven electric vehicle (EV) is presented in this paper. Without differential gears, direct-wheel-driven EV has to employ complicated differential algorithm for steering, which remarkably increased the difficulty of the control system of EV. The system proposed in this paper has changed the traditional structure and control method of direct-wheel-driven EV to simplify the control of EV. The propounded system connected two permanent-magnet brushless dc motors (PMBDCMs) directly in series, simplified the differential algorithm thoroughly in velocity control strategy, and adopted the traditional PI controller. By analyzing the dynamics of Four-wheel independent drive electric vehicle and combining the characteristic of the PMBDCM, the operation principle of the propounded system is explicated. Based on the analysis, an equipollent simulation system was developed under Matlab/Simulink platform, and validated the rationality and feasibility of the driving and control system for direct-wheel-driven EV. The particular performance of the propounded system made direct-wheel-driven EV more practical and competitive.