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Valve Manufacturer Specification Based Hydraulic Velocity Control

[+] Author Affiliations
Sirkku Kannisto, Tapio Virvalo

Tampere University of Technology, Tampere, Finland

Paper No. IMECE2002-39330, pp. 39-45; 7 pages
doi:10.1115/IMECE2002-39330
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Fluid Power Systems and Technology
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Fluid Power Systems and Technology Division
  • ISBN: 0-7918-3631-2 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

In this paper a closed loop hydraulic cylinder velocity control is realized with a mobile valve. The velocity feedback is based on the valve specifications and the measurement of the pressure difference over the control notch of the valve. Offsets and other non-linearities are approximated based on the pressure rise in chambers and the specifications of the manufacturer. The flow gain curve is measured with a method that suits mobile applications. The cylinder velocity is calculated from the spool control signal, measured cylinder chamber and supply pressures. The calculated velocity is compared to the actual velocity over the 1–100% velocity range and behaviour under disturbances is studied. The pressure compensator function is realized based on calculated velocity.

Copyright © 2002 by ASME
Topics: Valves

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