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.

Volume Subject Area:
Fluid Power Systems and Technology
Keywords:
Velocity servo, valve specifications, mobile machine
Topics:
Valves
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Copyright © 2002
 by ASME
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