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Pressure control of hydraulic servo system using proportional control valve

비례전자밸브를 사용한 유압서보계의 압력제어

  • Yang, Kyong-Uk (Graduate School of Pukyong National University) ;
  • Oh, In-Ho (Dept. of Shipping Service System Engineering, Korea Maritime University) ;
  • Lee, Ill-Yeong (Pukyong National University)
  • 양경욱 (부경대학교 대학원) ;
  • 오인호 (한국해양대학교 운항시스템공학부) ;
  • 이일영 (부경대학교 자동차공학과)
  • Published : 1997.08.01

Abstract

The purpose of this study is to build up control scheme that promptly control pressure in a hydraulic cylinder having comparatively small control volume, using a PCV (proportional control valve) and a digital computer. Object pressure control system has the character to be unstable easily, because the displacement-flow gain of the PCV is too large considering the small volume of the hydraulic cylinder and the time delay of response of the PCV is comparatively long. Considering the above-mentioned characteristics of the object pressure control system, in this study, control system is designed with two degree of freedom control scheme that is composed by adding a feed-forward control path to I-PDD$^{2}$ control system, and a reference model is used on the decision of control parameters. And through some experiments on the control system with FF-I-PDD$^{2}$ controller, the validity of this control method has been confirmed.

Keywords

Pressure Control;Two-degree of Freedom Control;Proportional Pressure Contrl Valve

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