Control device and method for monitoring such a control device
AssigneeAirbus Helicopters
InventorsGaël Dagorn, John McElhone, Pascal Izzo, Adrien Ott
Life of this patent
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Abstract
A control device comprising a lever provided with a magnetic dipole and able to move, at least in rotation, relative to a support about an axis. The control device includes a measuring device configured to measure a magnetic field generated by the magnetic dipole, and a monitoring system for monitoring the integrity of the control device. The monitoring system is configured to signal an anomaly using an alarm when a first norm of a first vector difference between the current magnetic field and a first reference magnetic field relating to an estimated orientation of the lever, is greater than a first magnetic field threshold for a duration greater than a duration threshold.
Claims10
A control device provided with a lever articulated to a support, the lever being provided with at least one magnetic dipole and able to move, at least in rotation, relative to the support about an axis, the control device comprising a measuring device configured to measure three components of a magnetic field generated by the magnetic dipole(s) at a position of the measuring device, the control device comprising a monitoring system for monitoring the control device,
- wherein the monitoring system is configured to signal an anomaly using an alarm when a first predetermined function is greater than a first magnetic field threshold for a duration greater than a duration threshold, and wherein the first predetermined function is a function of the three measured components of a current magnetic field and of an estimated orientation of the lever, the first predetermined function having as its value a first norm of a first vector difference between the current magnetic field and a first reference magnetic field determined at the position of the measuring device, the first reference magnetic field relating to the estimated orientation.
A method for monitoring a control device provided with a lever articulated to a support, the lever being provided with at least one magnetic dipole and able to move, at least in rotation, relative to the support about an axis, the control device comprising a measuring device configured to measure three components of a magnetic field generated by the magnetic dipole(s) at a position of the measuring device,
- wherein the monitoring method comprises the following steps:
- measuring the three components of a current magnetic field by the measuring device;
- determining an estimated orientation of the lever relative to the support, as a function of the three components by applying a stored transformation law;
- determining a first reference magnetic field for the estimated orientation from predetermined and stored values of the first reference magnetic field, the values being respectively associated with reference orientations of the lever;
- calculating a first predetermined function as a function of the three measured components of the current magnetic field, the estimated orientation of the lever and the first reference magnetic field relating to the estimated orientation, the first predetermined function having as its value a first norm of a first vector difference between the first reference magnetic field and the current magnetic field;
- and
- signaling an anomaly using an alarm when the first predetermined function is greater than a first magnetic field threshold for a duration greater than a duration threshold.
Dependencies are inferred from the claim text.