Aeronautics and astronautics – Aircraft control – Automatic
Patent
1976-03-30
1977-06-07
Kunin, Stephen G.
Aeronautics and astronautics
Aircraft control
Automatic
2351502, 244181, 340 27SS, G05D 100
Patent
active
040278395
ABSTRACT:
The invention relates to a flight control system for an aircraft which maintains reliable control of the angle of attack (.alpha.) in those regions where rate of change of the lift coefficient (C.sub.L) as a function of .alpha. goes to zero or becomes negative. This may cause a condition in which the feedback loop for the pitch moment generating control surface can inadvertently drive the aircraft into a stall or other unstable mode. Reliable control of angle of attack is achieved through a network which produces an estimated angle of attack signal (.alpha.) from the measured pitch rate of the aircraft, the lift acceleration error signal, a gravity control signal and sideslip and roll information. The estimated angle of attack signal is processed in a network which produces a pseudo coefficient of lift signal C.sub.L. The pseudo lift coefficient signal is processed to produce a pseudo lift (or normal) acceleration signal, A.sub.Z, which is supplied to the aircraft control loop. The pseudo signals track the actual coefficient of lift and lift acceleration characteristics of the aircraft over the angle of attack region where the response is linear or nearly so. That region of angle of attack where the actual aircraft coefficient of lift rate goes to zero and then negative, the pseudo signals remain linear. Hence, the feedback loop for the control surface does not see reduced lift acceleration signals and does not try to increase the angle of attack in order to achieve the acceleration demanded by the pilot's command. As a result, the control loop is prevented from inadvertently driving the aircraft into a stall or other unstable mode.
REFERENCES:
patent: 3095169 (1963-06-01), Osder
patent: 3446946 (1969-05-01), Andeen
patent: 3522729 (1970-08-01), Miller
patent: 3654443 (1972-04-01), Dendy et al.
Blumenfeld I. David
General Electric Company
Kunin Stephen G.
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