Method and device for identifying the position of a wheel of a vehicle
AssigneesCompagne Generale des Etablissements Michelin, Michelin Recherche et Technique S.A., TRW Automotive U.S. LLC
InventorsXavier Huchard, Philippe Corniot, Thierry Penot
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Abstract
A method of identifying a position of a wheel of a vehicle includes: providing, in at least one wheel of the vehicle, a device with at least one magnetic sensor with a maximum sensitivity axis; starting up the vehicle; measuring at terminals of each magnetic sensor a signal representative of magnetic flux time variations during rotation of the wheel; determining a characteristic quantity of the signal; comparing the characteristic quantity to a given threshold; and determining, according to a comparison result, a front or rear location of the wheel.
Claims30
A method of identifying a position of a wheel of a vehicle, comprising steps of:
- providing, in a first wheel of the vehicle, a first device with a magnetic sensor with a maximum sensitivity axis;
- measuring at terminals of the magnetic sensor of the first device a first signal representative of time variations of a magnetic flux during rotation of the first wheel while the vehicle is in operation;
- determining a characteristic quantity of the first signal;
- comparing the characteristic quantity to a given threshold to obtain a comparison result;
- and
- determining, according to the comparison result, whether the first wheel is in a front location or a rear location.
A system for monitoring wheels of a vehicle, comprising:
- in the vehicle, a central processing unit with a receiver and a processor;
- and
- in each wheel, a device including:
- a magnetic sensor with a maximum sensitivity axis,
- a signal measurement circuit that measures, at terminals of the magnetic sensor, a signal representative of time variations of a magnetic flux time during rotation of the wheel,
- a computation unit, and
- a transmitter,
- wherein each magnetic sensor has its maximum sensitivity axis arranged parallel to an axis of rotation of a corresponding wheel thereof,
- wherein each computation unit calculates a characteristic quantity that is a function of an energy of a signal measured at terminals of a corresponding magnetic sensor thereof,
- wherein the processor of the central processing unit determines, from the characteristic quantities transmitted by the devices of the wheels of the vehicle, a front location or a rear location of each device.
A system for monitoring the wheels of a vehicle comprising:
- in the vehicle, a central processing unit with a receiver and a processing unit;
- and
- in each wheel, a device including:
- two magnetic sensors, each with maximum sensitivity axes,
- a signal measuring circuit that measures, at terminals of each of magnetic sensor,
- a signal representative of magnetic flux time variations during rotation of the wheel,
- a computation unit, and
- a transmitter,
- wherein, for each device, the two magnetic sensors of the device are positioned at different azimuths and similar positions relative to an axis of rotation of a corresponding wheel in which the device is included,
- wherein, for each device, the computation unit of the device is able to calculate a self-correlation function of signals measured at the terminals of the two magnetic sensors of the device, and
- wherein the processing unit of the central processing unit is able to determine, from the self-correlation functions transmitted by the devices of the wheels of the vehicle, a front or rear and left or right locations of each of the devices of the vehicle.
Dependencies are inferred from the claim text.