Motors: expansible chamber type – Relatively movable working members with one having motive... – Synchronizing in response to sensed difference in positions
Patent
1990-06-15
1992-07-14
Look, Edward K.
Motors: expansible chamber type
Relatively movable working members with one having motive...
Synchronizing in response to sensed difference in positions
91189R, 91361, 91471, 91517, F01B 1100, F01B 2500
Patent
active
051293102
ABSTRACT:
A dual servo actuation system is automatically equalized or rigged by electronic control circuits. A static auto rigging bias is applied to one or the other, or both, of a pair of electro hydraulic servo valves that respectively control two hydraulic actuators driving a common member, such as an aircraft control surface. An auto rigging bias, which substantially eliminates force fight, is automatically generated and stored as a fixed quantity prior to use of the system for control of the common member. With a zero commanded output of the two actuators, a difference of differential pressures at the actuators is obtained and caused to change the number in a counter as long as the difference exceeds a threshold. The counter number, while it is above the threshold, is continuously applied as a bias signal to decrease the force fight, and the number in the counter is stored as a fixed bias signal when the force fight indicated by the difference of differential pressures drops below the threshold. This fixed bias signal is then applied to the servo actuation system during system operation.
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Hydraulic Units, Incorporated
Look Edward K.
Nguyen Hoang
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