Closed loop control of aircraft control surfaces
First Claim
Patent Images
1. A method comprising:
- measuring a flight metric of an aircraft during cruise of the aircraft;
calculating, using a processor, a first deflection based on the measured flight metric;
inducing a perturbation deflection of a control surface based on the calculated first deflection;
re-measuring the flight metric of the aircraft in response to the induced perturbation deflection to gather data about a drag coefficient pertaining to the aircraft during cruise;
calculating, using the processor, a second deflection of the control surface of the aircraft based on the re-measured flight metric by adding a perturbation estimate increment to a deflection estimate that reduces drag; and
adjusting the control surface to the second deflection to reduce the drag coefficient of the aircraft during cruise.
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Abstract
Closed loop control of control surfaces is described herein. One disclosed example method includes measuring a flight metric of an aircraft during flight and calculating, using a processor, a deflection of a control surface of the aircraft based on the flight metric. The disclosed example method also includes adjusting the deflection to an effective deflection level based on the calculated deflection to reduce a drag coefficient of the aircraft.
111 Citations
28 Claims
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1. A method comprising:
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measuring a flight metric of an aircraft during cruise of the aircraft; calculating, using a processor, a first deflection based on the measured flight metric; inducing a perturbation deflection of a control surface based on the calculated first deflection; re-measuring the flight metric of the aircraft in response to the induced perturbation deflection to gather data about a drag coefficient pertaining to the aircraft during cruise; calculating, using the processor, a second deflection of the control surface of the aircraft based on the re-measured flight metric by adding a perturbation estimate increment to a deflection estimate that reduces drag; and adjusting the control surface to the second deflection to reduce the drag coefficient of the aircraft during cruise. - View Dependent Claims (2, 3, 4, 5, 22, 26)
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6. A method comprising:
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measuring a flight metric of an aircraft during cruise of the aircraft; inducing a perturbation deflection of a control surface of the aircraft to a first angle based on the measured flight metric; re-measuring the flight metric in response to the induced perturbation deflection to gather data about a drag coefficient pertaining to the aircraft during cruise; calculating, using a processor, a second angle of the control surface based on the re-measured flight metric and one or more of a flight condition, or the measured flight metric, wherein the second angle includes an adjustment angle to reduce the drag coefficient of the aircraft during cruise; and adjusting the control surface to the second angle. - View Dependent Claims (7, 8, 9, 10, 11, 12, 19, 21, 23, 27)
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13. A method comprising:
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adjusting an aircraft control surface to a first angle during cruise of the aircraft; measuring a flight metric after the aircraft reaches steady state during cruise; calculating, using a processor, a deflection of the aircraft control surface based on the measured flight metric; inducing a perturbation deflection of the aircraft control surface based on the calculated deflection; re-measuring the flight metric in response to the induced perturbation deflection to gather data about a drag coefficient pertaining to the aircraft during cruise; calculating, using the processor, a second angle of the aircraft control surface based on the re-measured flight metric to reduce the drag coefficient of the aircraft during cruise, wherein the second angle includes an adjustment angle; and adjusting the aircraft control surface to the second angle. - View Dependent Claims (14, 15, 16, 17, 18, 20, 24, 25, 28)
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Specification