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AssigneeVickers, Incorporated
InventorsArthur H. Delmege, Yehia M. El-Ibiary, Melvin A. Rode, Lael B. Taplin
Estimating the term…
An electro-hydraulic servo control system which includes a servo actuator adapted to variably position a load mass, and an actuator control system which includes a sensor coupled to the actuator for providing an indication of measured actuator position and a digital observer responsive to measured actuator position for estimating velocity and acceleration at the actuator. Signals indicative of measured actuator position, estimated velocity and estimated acceleration are fed to a comparator, together with a position command signal, for obtaining a difference or error signal to provide a control input to the actuator. The observer electronics includes digital computation means suitably programmed to estimate position, velocity and acceleration as solutions to three linear equations with three unknowns. Equation constants, which are functions of actuator and driven mass physical characteristics, are entered through operator-adjustable resistors. The actuator position and error input signals are periodically sampled and stored as inputs to the observer electronics. The observer electronics also embodies a self-test feature to facilitate maintenance in the field.
A power servo system which includes an actuator adapted to variably position a load, means for receiving a state command signal, means for providing an error signal to control said actuator as a combined function of said state command signal and N dynamic state variable signals indicative of state conditions at said actuator and load, with N being an integer greater than one, and means reponsive to state conditions at said actuator and load for providing said N variable signals comprising:
Dependencies are inferred from the claim text.