Autopilot/flight director stall protection system

Details Autopilot/flight director stall protection system Autopilot/flight director stall protection system

1995-05-15

1998-09-08

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft control

Automatic

244181, 701 14, 340966, B64C 1316

Patent

active

058034080

ABSTRACT:
In an aircraft under autopilot control, a stall protection system overrides established autopilot parameters in response to a monitored angle of attack for the aircraft exceeding a trigger angle of attack. The trigger angle of attack is established with reference to a stick shaker angle of attack for the aircraft. When the aircraft exceeds the trigger angle of attack, the stall protection system produces an error signal causing the autopilot to seek an angle of attack 1 degree below the stick shaker angle of attack. Initially, the stall protection system provides a boost command to the error signal to accelerate the response of the aircraft to the error signal. The boost command is produced by a driving signal generator that selects one of four driving signals in response to monitored flap angle and impact pressure.

REFERENCES:
patent: 4027839 (1977-06-01), Quinlivan
patent: 4044975 (1977-08-01), Blecher et al.
patent: 5136518 (1992-08-01), Glover

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