Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1996-12-09
1998-11-03
Lopez, F. Daniel
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91363R, 364172, F15B 903
Patent
active
058293353
ABSTRACT:
A control for a hydraulic drive or actuator is provided, wherein the actuator has pressurized operating fluid applied thereto, and wherein the operating fluid is directed through an electrically controlled valve for establishing the amount of operating fluid to be fed to the actuator. An electrical signal for controlling the valve is provided by a computing device. In the computing device, a predetermined desired value for the position (or travel), force, or pressure of the actuator or drive is continuously calculated based, at any given time, at least on one measured or simulated state variable indicative of a condition of the drive or actuator at the time of calculation. The calculated desired value determines the amplitude of the electrical signal directed to an electrical actuating device of the valve. The computing speed of the computing device for determining the respective desired value is faster than the actuating velocity or speed of the valve.
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Ewald Roland
Grimm Andreas
Lopez F. Daniel
Mannesmann Rexroth GmbH
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