Flight control system having a three control loop design
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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Abstract
A flight control system is configured for controlling the flight of an aircraft utilizing a three control loop design to robustly increase system performance. An inner loop comprises an improved linear quadratic regulator (LQR) search method, and an outer loop comprises a classic feedback summary gain design. A third loop comprises a steady state trim search method.
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Citations
14 Claims
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1. A flight control system for controlling the flight of an aircraft, the system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling the flight of an aircraft, the method comprising:
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separating a flight control law into flow paths for a longitudinal component and a lateral component; passing a longitudinal motion input of the longitudinal component through a longitudinal linear quadratic regulator and a first gain scheduling block; passing a lateral motion input of the lateral component through a lateral linear quadratic regulator and a second gain scheduling block; regrouping an output from the first gain scheduling block with that of an output of the second gain scheduling block; shortening a gain selection with an outer loop utilizing a summary gain design; and obtaining a trim flight of the aircraft with a steady state trim loop.
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Specification