Torque Control Strategy for New Energy Commercial Vehicles without Tilt Sensors when Hill-stop

Abstract

In order to further improve the performance of the permanent magnet synchronous motor of new energy pure electric commercial vehicles under some severe working conditions, a torque control strategy for the standing slope mode of new energy commercial vehicles without tilt sensors is proposed. Combined with the mathematical model of the permanent magnet synchronous motor, the motor drive control system of the new energy commercial vehicle is established, and the torque requirement of the permanent magnet synchronous motor in the standing slope mode is studied. It is proposed that the torque compensation of the motor under severe operating conditions can be accomplished by adaptively adjusting the parameters given in the control loop to solve the problems of continuous high current output and low efficiency of the pure electric commercial vehicle motor under severe operating conditions. The experimental results show that the PI control and adaptive regulation system can quickly respond to the torque output and meet the requirements of the hill-stop function when the experimental vehicle with the improved hill-stop control strategy is unloaded or fully loaded on the 12% and 15% slope ramps. The experimental results of the whole vehicle verify the effectiveness and reliability of the proposed torque control strategy.