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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 p

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.

대표청구항 ▼

An aircraft control system, comprising in combination: an automatic pilot having a primary servo system for moving a primary control surface of an aircraft, the primary servo system including a primary servomotor coupled to the primary control surface and means for applying an electrical signal to a

An aircraft control system, comprising in combination: an automatic pilot having a primary servo system for moving a primary control surface of an aircraft, the primary servo system including a primary servomotor coupled to the primary control surface and means for applying an electrical signal to actuate the servomotor and thereby move the primary control surface; means including a two terminal, trim servomotor for actuating a trim control means associated with the primary control surface; a first amplifier channel connected to respond to the electrical signal applied to the primary servomotor and providing an output of one polarity; a second amplifier channel connected to respond to the electrical signal applied to the primary servomotor and providing an output having a polarity complementary to the output of the first amplifier channel; and means for connecting the output of said first channel to one terminal of said trim servomotor and the output of the second channel to the second terminal of the trim servomotor.