Improving Characteristics of Electrohydraulic Servo System by using DSP

A DSP (digital signal processor) is applied to an electrohydraulic servo system, and feed-forward compensation called ZPETC (zero phase error tracking control) which is impossible by analog techniques, greatly improves the frequency responses of the system. However, the relation-ship between load pr...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series C Vol. 61; no. 582; pp. 606 - 611
Main Authors Ukita, Akihiro, Suzuki, Katsumasa
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 1995
Subjects
Digital Control
DSP
Electrohydraulic Servo System
Hydraulic Actuator
Servo Mechanism
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ISSN0387-5024
1884-8354
DOI10.1299/kikaic.61.606

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Summary:A DSP (digital signal processor) is applied to an electrohydraulic servo system, and feed-forward compensation called ZPETC (zero phase error tracking control) which is impossible by analog techniques, greatly improves the frequency responses of the system. However, the relation-ship between load pressure and flow rate for the servo valve is highly nonlinear. Because ZPETC, which is feed forward compensation, assumes the controlled system to be linear, we must make this nonlinearity linear. Therefore, the dependence of servo valve on load pressure is removed by detecting load pressure, and the system is linearized. DSP performs the calculation for ZPETC and for linearizing the system. This effect of improving frequency responses of the system by the digital signal processing technique is investigated.
ISSN:0387-5024
1884-8354
DOI:10.1299/kikaic.61.606