Abstract
The hydraulic cylinder system is a nonlinear system with variable parameters. It is difficult to meet control demands or obtain satisfactory performance by adopting traditional tuning techniques. This paper presents a Fuzzy Model Reference Learning Controller (FMRLC) for positioning control of an electro-hydraulic servo system. FMRLC has three main parts: the fuzzy controller, the reference model and the learning mechanism. The learning mechanism tunes the rule base of the direct fuzzy controller by changing the centers of the output membership functions so that the closed loop system behaves like the reference model. These rule base modifications are made by observing data from the controlled process, the reference model and the fuzzy controller. The effectiveness of the proposed control was confirmed through simulations and experiments using the servo valve controlled cylinder system.
