Control systems

Details Control systems Control systems

1978-07-03

1980-04-15

Frankfort, Charles E.

Aeronautics and astronautics

Aircraft control

Automatic

244 83E, 318564, G05D 100

Patent

active

041980212

ABSTRACT:
A control system for controlling displacement of the aerodynamic control-surfaces of an aircraft includes a first signal processor that is supplied with input signals from the pilot's control column and also with predominantly lower-frequency components of feedback signals derived in accordance with the actual position of the control surfaces. The first signal processor derives an intermediate signal from the input and feedback signal components by digital processing and supplies this intermediate signal to a second signal processor which also receives the predominantly higher-frequency components of the feedback signal. The second signal processor derives an output signal from the intermediate and feedback signal components by analogue processing and supplies this to an actuator for controlling displacement of the control-surfaces. The second signal processor may also receive additional feedback signals directly from the actuator. The system may be used in quadruplex, including four first and second processors to produce four output signals in response to four input signals, wherein two monitor circuits both receive the four intermediate signals and operate to reject any of those intermediate signals which differ from the other intermediate signals by more than a predetermined amount. The monitor circuits amalgamate those intermediate signals not rejected and supply output signals representative of those intermediate signals to additional second signal processors which in turn produce output signals to additional actuators.

REFERENCES:
patent: 3095783 (1963-07-01), Flindt
patent: 3688099 (1972-08-01), Buscher
patent: 4130241 (1978-12-01), Meredith

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