The Applications Of Fuzzy Control In New Hydraulic Servo System Of Baosteel

With the development of industry and the Hydraulic Servo Control Technology (HSCT), the better control performance of the Hydraulic Servo Control System (HSCS) is required increasingly. At the same time, the higher flexibility of the system in the hostile environment is required as well. Based on HSC in the model oscillator of Shanghai Baosteel Company, by using the Hydrodynamics Dynamics, Kinematics and the classical control theory, the mathematical models of Valve controlled Hydraulic Cylinder (VCHC) are built, so the models of the position servo system are deduced, and the stability and various effect of errors of the system are analyzed in this paper. The conventional PID Controller is suitable for the linear system, but not for the VCHC model system, due to the nonlinear and the time variable model.According to the above problems, the main idea of this paper is the Fuzzy Control Theory is introduced in PID Controller, and The Fuzzy Control is used to modify the three parameters of the PID Controller. However, the hydraulic system always changes over time. The Quantization Factors and the Membership Functions(MF) in conventional Fuzzy-PID Controller are changeless, and the applicability and the real-time performance will be restricted, so the control performance and precision will be affected. In the view here, the adjustive parameters are introduced to Fuzzy-PID Controller, by changing which, the Quantization Factors and the MF can be modified.The Fuzzy-PID Controller with adjustive parameters designed in this paper, remedies not only the lack that PID Controller can’t adjust the parameters on-line, but also the static error, and also enhances the flexibility. In conclusion, the simulation result using the Simulink Toolbox shows that the revised Fuzzy-PID Controller works very well with good non-sine tracking performance.