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Fuzzy immune PID control in VVVF hydraulic system

This paper discusses and analyses precise hydraulic pressure control of VVVF hydraulic system. The mathematical model of system is established and PID control law is adopted. Numerical simulation of PID controller is carried out with the SIMULINK of MATLAB. In the non-linear, time-varying VVVF hydraulic system, however, conventional PID control often cannot satisfy the request of precise pressure control. This paper applies biology immune adjust principle and fuzzy control theory to design fuzzy immune self-adaptive controller which is used in VVVF hydraulic system, and gets favorable control effect. The MATLAB-based simulations show that fuzzy immune PID is effective in improving the control performance of VVVF hydraulic system.