Abstract:Hydraulic drilling rigs play an important role in modern tunneling construction. Existing hydraulic drilling rigs need to control 6 hydraulic cylinders and 2 hydraulic motors separately when searching for holes. The electro-hydraulic proportional valve controls the position control system of the hydraulic cylinder. Taking the position control of the arm cylinder by the electro-hydraulic proportional valve as an example, the other joint control systems can be deduced by analogy. The position control system of the hydraulic cylinder controlled by the electro-hydraulic proportional valve is actually a system that corrects the displacement of the hydraulic cylinder in real time during the drilling operation. This system can control the deviation between the desired displacement and the actual displacement of the hydraulic cylinder, which requires adding a controller to the control section. The structure of the fuzzy control system was designed, and the method and process of Fuzzy PID parameter tuning were discussed. Then the fuzzy controller of the electro-hydraulic proportional valve control hydraulic cylinder was designed and simulated by MATLAB’s Fuzzy toolbox and SIMULINK module. The simulation results showed that in this valve-controlled hydraulic cylinder control system, the Fuzzy PID controller has strong anti-interference ability, fast response and stable performance.