APPROXIMATE VELOCITY FEEDBACK USING HYDRAULIC VALVE FLOW MODELLING
2002 年 2002 巻 5-2 号 p. 501-506
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2002 年 2002 巻 5-2 号 p. 501-506
In this paper the cross sectional area of a hydraulic servo valve is modelled as a non-linear function of the spool position. The actual leakage flow between the work port and the tank as well as between the work port and the supply port is measured. The leakage flow is modelled based on an idea of a separate pressure drop factor for the flow through the notches and the flow in the gap. The actual leakage flow to the tank is subtracted from the measured flow and the actual leakage to the work port is added to it. The discharge coefficient in the theoretical turbulent flow equation is fi tted to the remaining flow curve and estimated volume flow is used as a velocity feedback in a hydraulic cylinder velocity servo.
