Novel power assist steering control strategy in electrical vehicle using independent twin motors

The purpose of control strategy is to present a novel controller of power assist steering system in electric vehicle. Firstly, integrated controller module was applied to electric vehicle whose front axle was refitted to meet the needs of two twin motors in independent hub wheel. Secondly, advanced algorithm was employed in optimizing decision-making rules of fuzzy controller. Thirdly, the new model was embedded in developing simulation environment with a driver-vehicle-road closed-loop system. Finally, control strategy compiled in controller prototype was used for a compact control system development platform in laboratory to verify the proposed controller. Both simulative and laboratorial results prove that if the vehicle is equipped with in-wheel motors on both sides and track steering torque indicator of driving current, the control strategy is beneficial to both improvement of yaw motion and reduction slip angle of vehicle.