Multi-axis force stick, self-trimmed aircraft flight control...

Details Multi-axis force stick, self-trimmed aircraft flight control... Multi-axis force stick, self-trimmed aircraft flight control...

B - Operations, Transporting

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B64C 13/50 (2006.01) B60N 2/46 (2006.01) B64C 13/04 (2006.01) B64C 27/56 (2006.01) G01L 5/22 (2006.01) G05D 1/00 (2006.01)

Patent

CA 1158219

- 29 - Multi-Axis Force Stick, Self-Trimmed Aircraft Flight Control System Abstract A four axis force stick provides signals indi- cative of force applied to the stick in an axis corresponding to a control axis of an aircraft, including pitch, roll, yaw and lift/speed. The force-related signals are applied through propor- tional and integral gain signal paths to operate electrohydraulic servos that control the aerodynamic surfaces of the aircraft, such as the cyclic and col- lective blade pitch of the main rotor and the tail rotor blade pitch of a helicopter, or the ailerons, rudder, elevator and thrust of a fixed wing aircraft. Signal conditioning provides a dead band to avoid integrating minute, inadvertent force stick signal outputs, and vernier sensitivity at low forces with high gain at high forces. Analog and digital embodi- ments are discussed. The relationship between this wholly new mode of aircraft control and ancillary aircraft functions, such as ground steering, autopilot and stability functions, are also discussed.

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