This paper deals with the position control of electrohydraulic servomechanisms using intelligent pseudo-derivative feedback (PDF) control algorithm. A dynamic model of the electrohydraulic servo valve controlled motor and the identification method of its parameters were derived. The tuning procedures of finding the optimum set of control coefficients are presented. The performance of the PDF control electrohydraulic servo system was evaluated through simulations and experimental studies. The results show that the PDF controller possesses better transient behavior to step reference input, much better external load handling capability and less sensitivity to inertia variations, compared with those of PID feedback controllers.
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