A hybrid PI/VI control method for an electro-hydraulic servo system

• Published in: 2021 International Conference on Artificial Intelligence and Electromechanical Automation (AIEA) pp. 5 - 9
• Main Authors: Yu, Zhen, Li, Weizhou, Liu, Lijun, Li, Zhehan
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.05.2021
• Subjects: Design methodology; electro-hydraulic servo system; global optimization; Interference; nonlinear H∞ control; Nonlinear systems; PD control; PI control; policy iteration; Robustness; Servomotors; value iteration
• DOI: 10.1109/AIEA53260.2021.00009

This paper proposes a hybrid PI (policy iteration) /VI (value iteration) control method for an electro-hydraulic servo system. The design of a hybrid PI/VI controller can be carried out in three steps: Firstly, an improved polynomial nonlinear control law is designed, which can ensure that the system has nonlinear control performance, and the solution of the control law is given; secondly, the problem of solving the nonlinear control law can be transformed into a problem of single objective polynomial global optimization which can be solved by genetic algorithm. Finally, the proposed control law is experimentally verified. The results show that, compared with the genetic algorithm optimized PID control law, the hybrid PI/VI control law has stronger robustness and control performance.