US 11,299,289 B1 · Angle-of-attack determination for aircraft stall protection

Abstract

A method for determining an aircraft angle-of-attack for aircraft stall protection includes providing an output signal from an angle-of-attack sensor and determining an initial angle-of-attack signal based on the output signal. The initial angle-of-attack signal is compensated to provide a pseudo angle-of-attack signal, and the pseudo angle-of-attack signal is mapped to a true angle-of-attack signal based on flight test data. The true angle-of-attack signal is compensated based on roll rate and sideslip or estimated sideslip to provide a compensated angle-of-attack. A complementary filter is applied that complements the compensated angle-of-attack signal with a higher frequency inertial angle-of-attack rate signal, calculated from aircraft inertial data, to provide an angle-of-attack complementary filter output. An angle-of-attack threshold for aircraft stall protection is determined based on one or more compensation parameters. Activation of aircraft stall protection is determined based on the angle-of-attack complementary filter output compared with the angle-of-attack threshold.

Claims17

Dependent claims

An aircraft angle-of-attack determining method, comprising:

providing an output signal from an angle-of-attack sensor to a controller;
providing a load factor component from the angle-of-attack sensor to the controller;
determining, via the controller, an initial angle-of-attack signal based on the output signal and the load factor component;
compensating, via the controller, the initial angle-of-attack signal to provide a pseudo angle-of-attack signal based on dynamic pressure;
mapping, via the controller, the pseudo angle-of-attack signal to a true angle-of-attack signal based on angle-of-attack flight test data,
wherein mapping the pseudo angle-of-attack signal is configured to remove nonlinear behavior of the pseudo angle-of-attack signal;
compensating, via the controller, the true angle-of-attack signal based on a measured aircraft roll rate and a measured aircraft sideslip to provide a compensated angle-of-attack;
and
applying, via the controller, a complementary filter that passes the compensated angle-of-attack signal through a low-pass filter and complements it with higher frequency inertial angle-of-attack rate signal calculated from aircraft inertial data to provide an angle-of-attack complementary filter output.

6 more elements

A method for determining an aircraft angle-of-attack for aircraft stall protection, comprising:

providing an output signal from an angle-of-attack sensor to a controller;
determining a load factor component for the aircraft;
determining, via the controller, an initial angle-of-attack signal based on the output signal and the load factor component;
compensating, via the controller, the initial angle-of-attack signal to provide a pseudo angle-of-attack signal based on dynamic pressure;
mapping, via the controller, the pseudo angle-of-attack signal to a true angle-of-attack signal based on flight test data, wherein the flight test data is acquired using a calibrated wing-tip-mounted angle-of-attack boom;
compensating, via the controller, the true angle-of-attack signal based on both roll rate and sideslip to provide a compensated angle-of-attack;
applying a complementary filter, via the controller, that passes the compensated angle-of-attack signal through a low-pass filter and complements it with higher frequency inertial angle-of-attack rate signal calculated from aircraft inertial data to provide an angle-of-attack complementary filter output signal;
determining, via the controller, an angle-of-attack threshold for aircraft stall protection based on one or more parameters;
and
activating aircraft stall protection based on the complementary filter output signal compared with the angle-of-attack threshold.

7 more elements

Dependencies are inferred from the claim text.

Angle-of-attack determination for aircraft stall protection

Life of this patent

Angle-of-attack determination for aircraft stall protection

Life of this patent

Abstract

Claims17