Patent ID: 6659400
Filing Date: 2003-12-09
Classification: B60T,B64C

Abstract:
In a system for controlling braking of an aircraft during landing, said system including wheel velocity signal generating means for producing a wheel velocity signal that is a function of the rotational speed of a wheel and an associated tire of the aircraft, and means for applying a command brake pressure to a wheel brake of the aircraft, the improvement comprising:a velocity reference generator for generating a reference velocity signal indicating a desired reference velocity; aircraft velocity comparison means for comparing said wheel velocity signal with said reference velocity signal for generating a velocity error signal indicative of the difference between said aircraft wheel velocity signal and said reference velocity signal; a brake controller for generating a brake pressure control signal for the wheel of the aircraft to cause the aircraft wheel velocity to converge to said reference velocity, based upon an estimated command brake pressure and an estimated value of a coefficient of friction between the tire and runway surface; a pressure bias modulator responsive to said wheel velocity signal and said reference velocity signal to provide an antiskid control signal; and means for summing said brake pressure control signal and said antiskid control signal to produce said command brake pressure signal.