Electricity: motive power systems – Positional servo systems – Vehicular guidance systems with single axis control
Patent
1974-08-09
1976-02-03
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Vehicular guidance systems with single axis control
318584, 318599, 318677, 318681, 244 77M, B64C 1316, G05D 100
Patent
active
039367150
ABSTRACT:
A system for electrically actuating the pitch trim of an aircraft in both autopilot and manual modes includes a primary pitch servomotor coupled to a primary control surface and a pitch trim servomotor for actuating a trim control surface. In the autopilot mode, an electrical signal applied to the primary pitch servomotor by the autopilot is also applied to two channels of a trim controller providing complementary output signals applied to the pitch trim servomotor. Each channel of the trim controller includes a voltage translator for providing a single ended voltage applied to an integrator that generates an output varying with the time average of the electrical signal applied to the primary pitch servomotor. This time average signal as generated in each channel is chopped into an alternating current signal for driving an output stage. The chopping duty cycle of each channel is varied in accordance with the absolute value of a time average of the electrical signal applied to the primary pitch servomotor. This absolute value signal is applied to a variable time constant circuit for driving a multivibrator that provides the chopping signal to each of the channels of the trim controller. For manual operation, a manual controller disables the automatic pilot and drives the output stage of each channel of the trim controller to provide complementary output signals to the pitch trim servomotor.
REFERENCES:
patent: 3123324 (1964-03-01), Hammell
patent: 3652912 (1972-03-01), Bordonaro
patent: 3682417 (1972-08-01), Burklund et al.
patent: 3719337 (1973-03-01), Gardner
patent: 3733039 (1973-05-01), O'Connor et al.
Nixon John M.
Younkin James R.
Dobeck B.
Edo-Aire Mitchell Industries, Inc.
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