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Flight control system having a three control loop design

  • US 8,473,124 B2
  • Filed: 11/08/2005
  • Issued: 06/25/2013
  • Est. Priority Date: 11/08/2004
  • Status: Active Grant
First Claim
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1. A flight control system for controlling the flight of an aircraft, the system comprising:

  • an inner loop configured to stabilize the flight control system, the inner loop having;

    a control law;

    wherein the control law is separated into flow paths for a longitudinal component and a lateral component;

    wherein the longitudinal component includes a longitudinal motion input that passes to a longitudinal linear quadratic regulator and a first gain scheduling block, the lateral component includes a lateral motion input that passes to a lateral linear quadratic regulator and a second gain scheduling block; and

    wherein an output from the first gain scheduling block and an output from the second gain scheduling block are regrouped;

    an outer control loop utilizing a summary gain design to shorten a gain selection; and

    a steady state trim loop configured to automatically catch the trim flight of the aircraft.

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