Vehicle handling assistant control system via independent rear axle torque biasing

In this paper, a vehicle handling assistant control system has been developed to improve vehicle steerability and stability in dynamic vehicle handling maneuvers by utilizing electrical drivetrain based vehicle dynamic control technology. The proposed Independent axle Torque Biasing (ITB) technology takes advantage of the direct yaw control moment obtained from differential left-to-right wheel torques to achieve additional torque steering. The highly integrated control system is expected to provide more powerful and smooth vehicle dynamic control performance in a wider range of application scenarios with minimal driving interventions. The proposed ITB control system has been designed to assist the vehicle handling to be close to a linear vehicle handling characteristic in normal driving situations and to restrain the vehicle lateral dynamics to be within the stable handling region in extreme maneuvers. Simulation results are provided to demonstrate the validity and effectiveness of the proposed ITB technology in vehicle dynamic handling assistance.