US 12,330,619 B2
Alternate-secondary system in pressure control mode for minimal braking disruption in a primary-alternate braking system
Marc J. Georgin, Dayton, OH (US); and Richard A. Poisson, Avon, CT (US)
Assigned to GOODRICH CORPORATION, Charlotte, NC (US)
Filed by Goodrich Corporation, Charlotte, NC (US)
Filed on Jun. 29, 2022, as Appl. No. 17/853,620.
Prior Publication US 2024/0001897 A1, Jan. 4, 2024
Int. Cl. B60T 8/94 (2006.01); B64C 25/44 (2006.01)
CPC B60T 8/94 (2013.01) [B64C 25/44 (2013.01); B60T 2270/402 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An aircraft braking system comprising:
a first brake control unit configured to determine a first brake pressure and to operate at the first brake pressure, wherein the first brake control unit comprises a first outboard brake control card (BCC) and a first inboard BCC;
a second brake control unit operatively coupled to the first brake control unit and configured to determine a second brake pressure by subtracting a deltaP from the first brake pressure and to operate at the second brake pressure, wherein the second brake control unit comprises a second outboard BCC and a second inboard BCC, and wherein either the first brake control unit or the second brake control unit is a primary brake control unit and the other of the first brake control unit and the second brake control unit is a secondary brake control unit;
a first hydraulic pressure source;
a first outboard dual brake control valve module fluidly connected to the first hydraulic pressure source and operatively connected to the first outboard BCC;
a first inboard dual brake control valve module fluidly connected to the first hydraulic pressure source and operatively connected to the first inboard BCC; and
a first shuttle valve operatively coupled to the first and second brake control units and having a check ball, the first shuttle valve configured to receive the first brake pressure and the second brake pressure, wherein the check ball is forced to one side of the first shuttle valve in response to a pressure change such that the first shuttle valve switches operation from the primary brake control unit to the secondary brake control unit, wherein the deltaP is a predetermined pressure difference that would cause the check ball of the first shuttle valve to switch position in response to the first brake control unit ceasing to provide the first brake pressure.