Fluid-pressure and analogous brake systems – Speed-controlled – Automatic braking including speed governor or hydraulic...
Patent
1995-05-12
1996-04-09
Butler, Douglas
Fluid-pressure and analogous brake systems
Speed-controlled
Automatic braking including speed governor or hydraulic...
303 20, 188181A, B60T 886
Patent
active
055055311
ABSTRACT:
An aircraft autobrake system utilizes a hydraulic fluid pressure sensor to provide a signal proportional to brake hydraulic fluid pressure magnitude to a control system. The control system uses closed loop feedback of this pressure signal to control autobrake application. Such control avoids pressure or deceleration overshoot or undershoot caused by not achieving brake stack closure when deceleration control is applied. Upon landing, if autobrake control command plus the change in autobrake control command necessary to eliminate deceleration error is less than a specified minimum, then brake stack closure needs to be maintained. In that case, the control system determines hydraulic fluid pressure error and adjusts hydraulic fluid pressure to eliminate such pressure error, using closed loop feedback. Upon elimination of pressure error, indicating brake stack closure, deceleration control then applies autobraking to slow the aircraft without pressure or deceleration overshoot or undershoot. If upon landing, the autobrake control command plus the change in autobrake control command necessary to eliminate deceleration error is greater than a specified minimum, then deceleration control is used to apply braking and decelerate the aircraft.
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Griffith Thomas T.
Yamamoto David T.
Butler Douglas
Hennen Thomas W.
The Boeing Company
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