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US 2018/0022440 A1Published application
Horizontal stabilizer trim actuator systems and methods
AssigneeThe Boeing Company
InventorsDerek M. Joseph, Kevin B. Eck, Christopher D. Feet, Yonas T. Meshesha, Timothy J. Soderquist, Barry D. Hance
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Abstract
Systems and methods are provided for a hydraulic stabilizer trim actuator (HSTA). The HSTA may operate one or more movable control surfaces. The HSTA operate responsive to commands issued by the pilot and/or by a controller and may include hydraulic architecture that minimizes the probability of an un-commanded movement or movement in the opposite direction of such commands.
Claims28
A system comprising:
- a hydraulic inlet configured to receive pressurized hydraulic fluid;
- a first hydraulic path fluidically connected to the hydraulic inlet;
- a second hydraulic path;
- a hydraulic shutoff apparatus fluidically connected to the first hydraulic path and the second hydraulic path and configured to be switched between a plurality of hydraulic positions wherein at least one of the hydraulic positions allows for the pressurized hydraulic fluid to flow from the first hydraulic path through the hydraulic shutoff apparatus to the second hydraulic path;
- a directional and rate control apparatus;
- a third hydraulic path fluidically connected to the directional and rate control apparatus;
- and
- a hydraulic motor fluidically connected to the directional and rate control apparatus via the third hydraulic path, wherein:
- the directional and rate control apparatus is configured to be switched between a plurality of directional control positions wherein at least one of the directional control positions allows for the pressurized hydraulic fluid to flow from the second hydraulic path through the directional and rate control apparatus to the hydraulic motor, and
- the hydraulic motor is configured to turn an output shaft to actuate a control surface of a vehicle responsive to receiving the pressurized hydraulic fluid from the directional and rate control apparatus and configured to be locked responsive to not receiving the pressurized hydraulic fluid from the directional and rate control apparatus.
7 more elements
A method comprising:
- receiving pressurized hydraulic fluid;
- flowing the pressurized hydraulic fluid into a hydraulic shutoff apparatus;
- switching, responsive to the flow of the pressurized hydraulic fluid into the hydraulic shutoff apparatus, the hydraulic shutoff apparatus to a first hydraulic position;
- flowing the pressurized hydraulic fluid into a directional and rate control apparatus;
- switching, responsive to the flow of the pressurized hydraulic fluid into the directional and rate control apparatus, a directional control valve of the directional and rate control apparatus to a first directional control position;
- monitoring the position of the directional control valve;
- actuating, responsive to the flow of the pressurized hydraulic fluid into the hydraulic motor, the hydraulic motor;
- turning an output shaft of the hydraulic motor;
- and
- actuating a control surface.
7 more elements
Dependencies are inferred from the claim text.