A Digital Compensator Design for Electrohydraulic Single-Rod Cylinder Position Control Systems

[+] Author and Article Information
J. Watton

Division of Mechanical Engineering and Energy Studies, School of Engineering, University of Wales College of Cardiff, Cardiff, CF2 1XH, U.K.

J. Dyn. Sys., Meas., Control 112(3), 403-409 (Sep 01, 1990) (7 pages) doi:10.1115/1.2896157 History: Received June 01, 1988; Revised August 01, 1988; Online March 17, 2008


A digital compensator using a forward algorithm, F(z−1 ), and a feedback algorithm, H(z−1 ), is developed for an electrohydraulic position control system incorporating an underlapped servovalve and a single-rod cylinder. The main problems encountered with designing such a closed-loop system are discussed, and it is shown how the filter coefficients may be easily determined for a particular class of open-loop transfer function. An excellent comparison between theory and experiment is obtained and it is deduced that one coefficient only need be changed in the forward algorithm for such gain-change dominant systems.

Copyright © 1990 by The American Society of Mechanical Engineers
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