Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1978-03-27
1979-07-24
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318616, 244194, G05B 902
Patent
active
041624386
ABSTRACT:
The servomotor outputs of two substantially identical servo channels, are connected through a differential mechanism to position an attitude control surface of an aircraft in response to common or separate, normally identical, command signals applied to the respective channels. Position and rate feedback means responsive to the movement of the control surface and each servomotor provides position and rate feedback signals to their respective channels. The primary position rate feedback term for each servomotor channel is derived from the position feedback means rather than from a servo tachometer to increase the stiffness of the output in resisting the motions commanded by a failed servo channel and to improve fault detection capability by increasing the difference velocity between a good and a failed channel. Improved electrical equalization means, to allow more effective or lower velocity mismatch between the two servo channel motors, is provided wherein the equalization includes limits, which are varied in response to the input command. Also, monitoring with fault isolation is provided employing an estimate of surface position whereby the system is provided with fail operational characteristics.
REFERENCES:
patent: 3504248 (1970-03-01), Miller
patent: 3719878 (1973-03-01), Ferguson et al.
patent: 4035705 (1977-07-01), Miller
patent: 4094481 (1978-06-01), DeWalt
Cefalo Albert P.
Dobeck B.
Sperry Rand Corporation
Terry Howard P.
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