Development of hybrid control of electrohydraulic torque load simulator

This paper carries out the thorough analysis and research on torque load simulator using electrohydraulic servo control. Aiming at the problems that existed in loading system, such as the extraneous torque, multi-channels cross coupling and parameter variation, an exact dynamic mathematical model is established, and a new kind of compound control law is proposed. The control law consists of compensation to disturbance, internal loop robust PID control, and generalized proportion-integral control to forward error. By means of this kind of control law, the robustness and tracking performance of loading system can be greatly improved, and the extraneous torque can be effectively decreased.