Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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Development and Verification of Analytical Model of a Pilot Operated Flow Control Valve for 21-ton Electric Excavator

21톤급 전기 굴삭기용 파일럿 작동식 유량제어 밸브의 해석모델 개발 및 검증

  • Kim, D.M. (Department of Mechanical Engineering, Gachon University) ;
  • Nam, Y.Y. (Korea Institute of Machinery and Materials) ;
  • Seo, J.H. (Korea Institute of Machinery and Materials) ;
  • Jang, J.S. (Department of Mechanical Engineering, Gachon University)
  • Received : 2015.07.28
  • Accepted : 2015.08.25
  • Published : 2015.09.01
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Abstract

An electro hydraulic poppet valve (EHPV) and a variable orifice poppet are assembled in a single block, which is referred to as a RHINO but is also generally called a pilot-operated flow control valve. In this study, we analyzed the structure and the operating principle for a RHINO applied in a 21-ton electric excavator system. The RHINO was experimentally tested to measure the dynamic responses and the pressure energy loss. In this test, we investigated the variation in the conductance coefficient according to the increase in the supply pressure under a constant current and a variation in the flow rate according to the increase in the current. Then, the geometrical shapes and the spring stiffness of the RHINO were considered to develop an analysis model. The characteristics (current-force and hysteresis) for the solenoid based on the experimental data were reflected in the analysis model that was developed, and the reliability of the analysis model was also verified by comparing the experimental and analytical results. The developed model is thus considered to be reliable for use in a wide range of applications, including optimum design, sensitivity analysis, parameter tuning, etc.

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