Traction Control for Electric Vehicles Starting on an Uphill Road by Torque Function Control with Bias Torque

We have proposed the new torque function control (TFC) method with the bias torque to improve the acceleration performance and the slip suppression performance of electric vehicles (EVs) starting on an uphill road, and obtained the method how to optimize the bias torque. This optimization gives the maximum bias torque satisfying that there is only one vehicle stationary point on the stable area of the road friction function. We evaluated the effectiveness of the TFC method using the optimized bias torque for EV starting on an uphill road by simulations and experiments. In the simulations, the slip phenomenon is suppressed rapidly and continuously due to the optimized bias torque. In the experiments using the EV carrying one person, when using the proposed TFC method with the optimized bias torque, the vehicle speed is 1.7 times at 3 s compared with the EV accelerates with slipping.