US 12,084,171 B2
Detecting the state of a parking brake member
Brian Goyez, Moissy-Cramayel (FR); Guillaume Durand, Moissy-Cramayel (FR); and Eric Clairardin, Moissy-Cramayel (FR)
Assigned to SAFRAN LANDING SYSTEMS, Velizy Villacoublay (FR)
Filed by SAFRAN LANDING SYSTEMS, Velizy Villacoublay (FR)
Filed on Jun. 3, 2020, as Appl. No. 16/891,765.
Claims priority of application No. 19 05845 (FR), filed on Jun. 3, 2019.
Prior Publication US 2020/0377200 A1, Dec. 3, 2020
Int. Cl. B60T 17/22 (2006.01); B64C 25/44 (2006.01); F16D 63/00 (2006.01); F16D 66/00 (2006.01)
CPC B64C 25/44 (2013.01) [F16D 63/002 (2013.01); F16D 2066/003 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A detection method for detecting a blocked or unlocked state of a parking brake member of a brake of an aircraft wheel, the detection method comprising:
controlling a power supply component connected to a parking brake member comprising a bistable linear electromagnet comprising a ferromagnetic torus, a coil, a permanent magnet, and a shuttle connected to a rod, the shuttle being mounted in the ferromagnetic torus to slide between two extreme positions situated on opposite sides of the permanent magnet and corresponding respectively to an extended position and to a retracted position for the rod, to generate a test voltage across the terminals of the coil to generate a test current flowing in the coil, the test voltage having an amplitude less than a predetermined voltage threshold so that a test magnetic field generated by the test current does not move the shuttle;
acquiring measurements of the test current from a current sensor connected to the parking brake member; and
analyzing the measurements of the test current and detecting the blocked or unlocked state of the parking brake member based on the analyzing,
wherein the test voltage comprises a voltage level and wherein the analyzing comprises comparing an amplitude of the test current with a first predetermined current threshold, or
wherein the measurements are analyzed using frequency analysis, said frequency analysis comprising comparing an amplitude of at least one harmonic of the test current with a second predetermined current threshold.