Ground state-fly state transition control for unique-trim aircraft flight control system
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United States of America Patent
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-
Aug 29, 1995
Grant Date -
N/A
app pub date -
May 17, 1994
filing date -
May 17, 1994
priority date (Note) -
In Force
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Abstract
An aircraft control system for an unique-trim, model-following system includes a feedforward shaping function that provides quickening of pilot input, and an automatic trim function that accommodates return of the cockpit controller to an unique, centered position during trimmed flight. The basic control law is reconfigured in response to the changing state of landing gear contact to support transitions between ground state and fly state conditions. The state of the landing gear is monitored continually to recognize the occurrence of initial ground contact and whether the aircraft is constrained about a rotational axis due to ground contact. The control is altered progressively as the transition proceeds so that command of the control surface is consistent with the degree of constraint imposed by ground contact.
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