Power Steering and Active Front Wheel Steering Control Strategy for EHCS on Commercial Vehicles

This paper proposed a set of steering control strategies for commercial vehicles based on Electro-Hydraulic Coupling Steering (EHCS) system, including power assistance control and active front wheel steering control. Firstly, the dynamic model of EHCS was established. Then, steering assistance control strategy and active front wheel steering control strategy were respectively designed based on the torque mode and angle mode of the power steering motor, and validated in the Simulink simulation environment. Finally, real-road tests were conducted on a test vehicle equipped with EHCS, and the smoothness and agility of EHCS control strategies were verified through subjective evaluation by test drivers combined with whole vehicle tests.