Patent ID: 7317981

Claim:
An aircraft brake actuation system that exhibits a predetermined amount of hysteresis due to one or more sources of mechanical inefficiency, the system comprising: a control circuit adapted to receive a brake command signal representative of a desired brake force and operable, in response thereto, to (i) adjust the brake command signal a predetermined amount based on the predetermined amount of hysteresis and (ii) supply a brake force actuator command signal based on the adjusted brake command signal; and an electromechanical brake actuator coupled to receive the brake force actuator command signal and operable, in response thereto, to move to a position that will supply the desired brake forces, wherein the adjusted brake command signal is an adjusted actuator position command signal, and wherein the control circuit comprises: a command filter circuit configured to receive the brake command signal and operable, in response thereto, to (i) supply an actuator position command signal, (ii) determine a rate of change of the brake command signal, and (iii) supply a brake command rate signal representative of the determined rate of change; an anti-hysteresis circuit coupled to receive the brake command rate signal and operable, in response thereto, to supply an actuator position command adjustment signal; and a position control circuit coupled to receive the actuator position command signal and the actuator position command adjustment signal and operable, in response thereto, to (i) adjust the actuator position command signal a predetermined amount, based on the actuator position command adjustment signal, and (ii) supply the brake force actuator command signal based on the adjusted actuator position command signal.