Method for monitoring at least two electromechanical braking actuators

• US 9,815,447 B2
• Filed: 01/26/2015
• Issued: 11/14/2017
• Est. Priority Date: 01/31/2014
• Status: Active Grant

• Current Assignee: Safran Landing Systems
• Original Assignee: Messier-Bugatti-Dowty
• Inventors: Chico, Philippe, Ragot, Frdric, Bonigen, Franois, Lepage, Thomas
• Primary Examiner(s): INGRAM, THOMAS P
• Application Number:
  US14/605,488
• Publication Number:
  US 20150217748A1
• Time in Patent Office: 1,023 Days
• CPC Class Codes: B60T 17/22 Devices for monitoring or checking brake systems; Signal devices
• CPC Class Codes: B60T 17/221 Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M
• CPC Class Codes: B60T 2270/406 Test-mode; Self-diagnosis
• CPC Class Codes: B60T 8/1703 for aircrafts
• CPC Class Codes: B60T 8/885 using electrical circuitry
• CPC Class Codes: B64C 25/44 Actuating mechanisms

Abstract

A method for monitoring at least two aircraft wheel electromechanical braking actuators. For each electromechanical actuator, the method includes first determining a current value representative of the power supply current of the electromechanical actuator and determining a reference current value estimated from the power supply currents of at least one other electromechanical actuator. Then, the representative current value and the reference current value are compared. Any abnormal operation of the electromechanical actuator is detected when the difference between the representative current value and the reference current value is above a predetermined threshold.

Claims

1. A method for monitoring and restoring or disabling at least three aircraft wheel electromechanical braking actuators (5), each electromechanical actuator (5) being powered by a power supply providing a current (Ia) under control of a braking controller (9) to selectively apply a braking force to friction members (15), the monitoring and restoring or disabling method comprising:

activating the electromechanical actuators (5), and

thereafter, for each active electromechanical actuator (5), performing the steps of;

determining with a current sensor (18) a current value (Ivr) representative of the power supply current of the electromechanical actuator;

determining by the braking controller (9) a reference current value (Ir) estimated from the power supply currents of at least two other electromechanical actuator (5);

comparing by the braking controller (9) the representative current value (Ivr) and the reference current value (Ir);

detecting by the braking controller (9) an abnormal operation of the electromechanical actuator (5) when the difference between the representative current value and the reference current value is above a predetermined threshold (Is), and

following the detection of an abnormal operation of an electromechanical actuator (5), the steps of;

identifying by the braking controller (9) the electromechanical actuator (5) exhibiting the abnormal operation;

signalling by the braking controller (9) abnormal operation of the electromechanical actuator (5);

performing by the braking controller (9) a restoration or deactivation of the abnormal electromechanical actuator (5).

2. The method according to claim 1, in which the representative current value (Ivr) is an absolute value of an estimation of the power supply current of the electromechanical actuator (5).

3. The method according to claim 1, in which the reference current value (Ir) is an average of absolute values of estimations of the power supply currents concerned.

4. The method according to claim 2, in which the estimations of the power supply currents are average values or instantaneous values of the power supply currents.

5. The method according to claim 1, in which the representative current value (Ivr) and the reference current value (Ir) are obtained from power supply currents measured during off-load operating phases of the electromechanical actuators.

6. The method according to claim 1,

wherein the restoration action comprises performing a corrective or reconfiguration action to try to restore the electromechanical actuator to normal operating conditions;

and

wherein the deactivation action comprises deactivating the electromechanical actuator exhibiting an abnormal operation if the corrective or reconfiguration action does not make it possible to restore the electromechanical actuator to the normal operating conditions.

7. The method according to claim 3, in which the estimations of the power supply currents are average values or instantaneous values of the power supply currents.