Aeronautics and astronautics – Aircraft control – Automatic
Patent
1989-09-29
1992-01-21
Barefoot, Galen
Aeronautics and astronautics
Aircraft control
Automatic
91378, 91381, 244194, 244227, B64C 340
Patent
active
050822080
ABSTRACT:
A control system and method for controlling a flight control member employs a hydraulic control valve which is responsive to input from the pilot in a manner to start and stop a hydraulic motor which in turn starts and stops movement of the control member so that the control member assumes the desired flight control position. The control valve comprises a valve housing means, a first valve element and a second valve element wherein the first valve element moves from an initial position thereof relative to the valve housing to a selected new position in a manner to open a selected port means to cause fluid to flow to a hydraulic drive means and also to establish a selected feedback displacement quantity, which is a quantity by which the second valve element is to be displaced from an initial position thereof relative to the valve housing in a manner that when the second valve element is displaced by the feedback displacement quantity to the new position, the second valve element closes a selected port means to interrupt fluid flow to the hydraulic drive means. The second valve control means is responsive to feedback from the flight control member. The system and method also uses a planetary gear transmission which provides for a drive input from the hydraulic drive, a second drive input from a backup drive motor, and rotational feedback to the control valve.
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Barefoot Galen
The Boeing Company
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