Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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Static Performance Diagnosis Based on Pressure Signal for a Flow Control Servovalve or Proportional Direction Valve

유량제어용 서보밸브와 비례방향밸브의 압력신호를 이용한 정적 성능 진단에 관한 연구

  • Kim, S.D. (Department of Intelligent Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Jeon, S.H. (Department of Intelligent Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Kim, I.D. (Department of Intelligent Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Ham, Y.B. (Extreme Energy Machinery Laboratory, KIMM)
  • Received : 2012.07.13
  • Accepted : 2012.11.14
  • Published : 2012.12.01
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Abstract

Most diagnosis methods for servo valves requires installing spool displacement sensor or flow sensor as well as pressure sensor. The measurement of flow is hard to implement and many kinds of servovalves or proportional direction valves do not have a built-in spool displacement sensor. In this study, static performances of servovalve or proportional-direction-valve are studied theoretically and a diagnosis technique, which uses only load pressure and input current signal, is assessed. An experimental setup was made based upon a personal computer and the LabVIEW graphical language. A series of diagnosis tests were performed and the analysis results showed it possible to measure the pressure gain, hysteresis and null bias in a relatively simple methodology.

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References

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