METHOD FOR CONVEYING HYDRAULIC FLUID, AND ELECTROHYDRAULIC MOTOR-PUMP UNIT THEREFOR
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United States of America Patent
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Issued Date -
Aug 27, 2015
app pub date -
Feb 27, 2015
filing date -
Feb 27, 2014
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Abstract
An electrohydraulic motor-pump unit comprises an unsteadily conveying displacement pump for conveying hydraulic fluid in a hydraulic system, an electric motor coupled with the displacement pump for driving the displacement pump, and an electrical control device coupled with the electric motor for controlling the electric motor. By way of a detector there is captured a pulsation parameter, which originates from a pulsation arising due to unsteady conveyance of hydraulic fluid in the hydraulic system, and by way of a modulator as part of the electrical control device the drive torque or the rotating speed of the electric motor for driving the displacement pump is modulated on the basis of the captured pulsation parameter. As a result the drive torque or the rotating speed of the electric motor is modulated in accordance with the conveying frequency of the displacement pump.
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