Actuator control valve arrangement

Patent metadata

Field	Value
Publication number	US-10933979-B2
Application number	US-201916704037-A
Country	US
Kind code	B2
Filing date	Dec 5, 2019
Priority date	Feb 11, 2019
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

A spoiler actuator can be operated by applying high pressure to a first chamber of the actuator on receipt of a command to extend the spoiler; applying high pressure to a second chamber of the actuator on receipt of a command to retract the spoiler; and on failure of a supply of the high pressure actuating an anti-extension valve to prevent extension of the spoiler; disengaging the anti-extension valve to permit extension if pressure applied to the anti-extension valve exceeds a predetermined force of a spring biasing the anti-extension valve to the engaged position, wherein additional force is applied to the anti-extension valve if the spoiler is retracted beyond a neutral position.

First claim

The invention claimed is:

1. An actuator control arrangement comprising:
a hydraulic actuator having a housing and a piston rod axially moveable within the housing between a neutral position, a retracted position and an extended position with respect to the housing in response to application of pressure to the piston rod;
a solenoid valve arranged between a pressure source and the actuator, the solenoid valve switchable between a first mode and a second mode in response to an electric control signal, wherein, in the first mode, the solenoid valve creates a fluid flow path from the pressure source to the actuator and in the second mode, the solenoid valve creates a fluid flow path to release pressure from the actuator;
an anti-extension valve provided between the pressure source and the actuator, configured to move between a first position in which a fluid path is created between the pressure source and the actuator and a second, anti-extension position to prevent extension of the piston rod with respect to the housing in the event of pressure loss, wherein the anti-extension valve has a first pressure input arranged to receive pressure from the pressure source and a second pressure input arranged to receive pressure from the actuator, the sum of the pressure at the first input and at the second input acting against a spring biasing the anti-extension valve into the second position; and
an outlet port in the actuator housing arranged to be closed when the solenoid valve is in the first position and open when the solenoid valve is in the second position and, when open, to convey pressure from the actuator to a third input of the anti-extension valve to add to the pressure acting against the spring.

2. The actuator control arrangement of claim 1 , further comprising an electrohydraulic servovalve, EHSV, between the pressure source and the actuator to control the direction of pressurised fluid to the actuator in response to the electric control signal.

3. The actuator control arrangement of claim 2 , wherein the EHSV is moveable between a first position in which high pressure fluid is directed from the fluid source to a first chamber of the actuator to cause extension of the piston rod and a second position whereby high pressure fluid is directed to a second chamber of the actuator to cause retraction of the piston rod with respect to the housing.

4. The actuator control arrangement of claim 3 , wherein a default position of the EHSV is the second position.

5. A spoiler control arrangement for an aircraft, comprising:
a spoiler moveable relative to a wing surface; and
an actuator control arrangement as claimed in claim 1 , the actuator arranged to move the spoiler by movement of the piston rod.

Assignees

• Goodrich Actuation Systems Sas

Inventors

• Medina Raphael
• Meignat Gregory

Classifications

• F15B2211/7055

  having more than two chambers · CPC title

• F15B2211/329

  actuated by fluid pressure · CPC title

• B64C13/44 Primary

  overriding of personal controls; with automatic return to inoperative position · CPC title

• F15B15/204

  Control means for piston speed or actuating force without external control, e.g. control valve inside the piston (F15B11/02, F15B15/22 take precedence) · CPC title

• F15B2211/30515

  Load holding valves · CPC title