Constant altitude auto pilot circuit

Details Constant altitude auto pilot circuit Constant altitude auto pilot circuit

1976-06-21

1977-09-20

Kunin, Stephen G.

Aeronautics and astronautics

Aircraft control

Automatic

307230, 318584, 328142, G05D 108

Patent

active

040492230

ABSTRACT:
A constant altitude auto pilot circuit samples an altitude electronically d produces error output voltages proportional to the changes in altitude which are used to command the control system of an aircraft. To set the device, the plane obtains the desired altitude whereafter the device is activated. A switch in parallel with an op-amp is closed to charge a capacitor to a voltage level proportional to the output of a transducer. When the switch is opened, all inputs to the op-amp become relative to the charge of the capacitor. Any variation is amplified by the op-amp. Additional inputs allow biasing the altitude signal up or down or introducing a damping signal for control loop stability.

REFERENCES:
patent: 3504267 (1970-03-01), James et al.
patent: 3638092 (1972-06-01), Kammerer
patent: 3742325 (1973-06-01), Andresen, Jr.
patent: 3845398 (1974-10-01), Katz
patent: 3934222 (1976-01-01), Bateman et al.
patent: 3940673 (1976-02-01), Darlington

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