On the development of a PWM control-based pneumatic servomechanism.

S. G. Lee, H. S. Cho

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Citation (Scopus)


Positioning or tracking using pneumatic servosystems has not been widely used in practical applications due to high cost, complexity and susceptibility of the system to fluid contamination. In this paper a low cost, simple, pneumatic servosystem is developed to to achieve accurate tracking as well as positioning control without the use of conventional servovalves. This control system is essentially an on/off servosystem, which uses a pulse width modulation controller incorporating PI action. Since this control system includes critical system parameters such as the pulse frequency, pulse width of the controller and the beedback gain parameter, a series of experiments was performed to investigate the effects of these parameters on the stedy state and transient response characteristics. As an input signal for the positioning control a step input was used, while for the tracking control a ramp signal was used. The experimental results show that high positioning and tracking accuracy as well as fast response can be achieved by this simple control configuration. (A)

Original languageEnglish
Title of host publicationIN
Subtitle of host publicationFLUID CONTROL AND MEASUREMENT, (TOKYO, JAPAN: SEP. 2-6, 1985), M. HARADA (ED.)
PublisherPergamon Press
Volume1 , Oxford, U.K., Pergamon Press, 1986, p.59-66. (ISBN 0-08-031681-6)
ISBN (Print)0080316816, 9780080316819
Publication statusPublished - 1986


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