Hydraulic driving device
AssigneeMannesmann Rexroth GmbH
InventorAlfred Feuser
Life of this patent
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Abstract
A hydraulic driving device includes a working cylinder for moving a machine component, and an electro-hydraulic servo system. The servo system includes a servo-valve, a position-error control, a circuit for emulating speed and acceleration of the working cylinder, and a regulator for weighting the ascertained position error according to the emulated speed and acceleration, and generating a setting signal for the servo valve.
Claims6
A hydraulic driving device including a hydraulic motor and an electro-hydraulic servo system for controlling the displacement of said hydraulic motor, said servo system comprising an electrically controlled control valve connected to a hydraulic pressure circuit of said hydraulic motor;
- a transducer coupled to a driven member of said hydraulic motor to generate an actual displacement signal;
- means for comparing the actual displacement signal with a desired displacement signal and generating a position error signal;
- means for electrically emulating intrinsic oscillations of said hydraulic motor and generating an estimate acceleration signal and an estimate speed signal;
- and a regulator having inputs connected to said emulating means and an output connected to an electrical control input of said control valve, said regulator weighting said position error signal according to said estimate signals and generating a weighted setting signal for said control valve;
- said transducer generating a digital actual displacement signal, and said comparing means including a computer programmed for comparing said digital actual displacement signal with a desired displacement value and delivering at its output an analog position error signal.
Dependencies are inferred from the claim text.