A Hybrid of Fuzzy and PID Controller for Servo Electro-Hydraulic System
نویسنده
چکیده
In industrial applications, the dynamic characteristics of the servo-hydraulic system are always complex and highly nonlinear. Moreover, there are too many uncertainties in it; for example, the viscosity of oil, the bulk modulus, the oil volume, the system pressure, the wear and the cavitations. The loading conditions are usually rather unsteady, and the loading forces change in a wide range during operation. It is difficult to meet control demands or obtain satisfactory performance by adopting traditional PID tuning techniques. In this paper, Fuzzy hybrid control using indirect inference method is presented for positioning control of an electrohydraulic cylinder. Smooth control during switching is guaranteed by executing the change using fuzzy inference. Through the simulations and experiments using the servo valve controlled cylinder system, the effectiveness of the proposed control was confirmed.
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