Aircraft altitude hold system

Details Aircraft altitude hold system Aircraft altitude hold system

1977-04-04

1978-06-13

Blix, Trygve M.

Aeronautics and astronautics

Aircraft control

Automatic

318584, 343112A, 364433, G05D 108

Patent

active

040944808

ABSTRACT:
Aircraft altitude is maintained through control surfaces responsive to an altitude hold control voltage varying with the output of a pressure transducer. The pressure transducer provides an output varying in a linear relationship with absolute atmospheric pressure and this output is applied to the input of a nonlinear circuit that generates a voltage varying linearly with altitude. A digital-to-analog converter generates an altitude reference voltage in response to an altitude hold engage signal and this voltage is combined in a summing amplifier with the voltage varying linearly with altitude. Also summed with the altitude reference voltage and the voltage varying linearly with altitude in the summing amplifier is a standard reference voltage. The total summation that is made in the summing amplifier produces the altitude hold control voltage as an output thereof. This altitude hold control voltage is also compared with the standard reference voltage to provide control signals to the digital-to-analog converter.

REFERENCES:
patent: 3578269 (1971-05-01), Kramer
patent: 3940673 (1976-02-01), Darlington

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