Method for locating a position of each wheel of a motor vehicle associated with an electronic device

Patent metadata

Field	Value
Publication number	US-11110757-B2
Application number	US-201816631950-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	Jul 20, 2017
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A method for locating at least one wheel of a vehicle, the wheels each being equipped with an electronic device which sends a wheel rotation signal to a central unit, a speed sensor for each wheel which supplies a signal to the central unit. For each electronic device, at least two sequences of several acquisitions are performed by formation of the signal with simultaneous acquisition by the central unit of the signal transmitted by each speed sensor. A pairing is performed of the two signals for an electronic device with each of the wheel speed signals. For each pair, a phase offset is measured between the two signals. When a constant phase offset is measured in the pairs with a speed sensor, the electronic device associated with the signal is identified as being assigned to the wheel associated with the speed sensor.

First claim

The invention claimed is:

1. A method for locating a position of each wheel of a motor vehicle comprising wheels each equipped with an electronic device which integrates at least one sensor for an operating parameter correlating to a rotation of the associated wheel, and an emitter transmitting values of said at least one operating parameter to a central unit, a wheel speed sensor for each wheel which supplies data representative of the rotation of the associated wheel to the central unit, said location method comprising:
for each electronic device, at least two sequences of several acquisitions of said at least one parameter are performed, which are then transmitted by the electronic device to the central unit by formation of a signal correlating to the rotation of the associated wheel for said at least two sequences, with simultaneous acquisition by the central unit of data representative of the rotation transmitted by each wheel speed sensor by formation of a signal associated with each wheel speed sensor acquired during each of said at least two sequences,
a pairing is performed of the signal correlating to the wheel rotation for the electronic device for said at least two sequences with each of the signals associated with each of the wheel speed sensors,
for each pair, a phase offset is measured between the signal correlating with the rotation of the wheel associated with the electronic device and the signal associated with each wheel speed sensor, and
when a constant phase offset varying within a predefined calibratable range is measured in the pairs of said at least two sequences with the signal associated with the wheel speed sensor, while the other pairs with the signals associated with the other wheel speed sensors have a greater or variable phase offset, the electronic device associated with said at least one signal correlating with the rotation of the wheel is identified as being assigned to the wheel associated with the wheel speed sensor which emitted the signal of the wheel speed sensor having a constant phase difference from the signal of the electronic device,
the method being continued for associating a wheel of the vehicle to each electronic device.

2. The method according to that claim 1 , wherein the predefined calibratable range varies from +/−0 to 15%, being a function of a travel of the motor vehicle (V).

3. The method according to claim 2 , wherein when no constant phase offset is measured in any of the pairs with the signals associated with the wheel speed sensors, or when the phase offsets of the pairs with the signals associated with the wheel speed sensors are similar, the method is suspended for said at least two acquisition sequences.

4. The method according to claim 1 , wherein when no constant phase offset is measured in any of the pairs with the signals associated with the wheel speed sensors, or when the phase offsets of the pairs with the signals associated with the wheel speed sensors are similar, the method is suspended for said at least two acquisition sequences.

5. The method according to claim 1 , wherein the central unit memorizes the recorded phase offsets and classifies these into measured phase offset groups with similar characteristics as a function of the following parameters taken alone or in combination: a journey of the vehicle corresponding to a specific speed or within a range of 20% around a specific speed, a journey with one or more phases of stoppage or deceleration of the vehicle, or a meandering course of the route followed.

6. The method according to claim 1 , wherein for a classified phase offset group with similar characteristics as a function of said parameters and composed of a set of phase offsets, a mean phase offset value and a standard deviation of phase offset around this mean value are established, this mean phase offset value and the standard deviation phase offset being applied to a new journey with said characteristics of the group, the phase offset of said new journey being then stored in the group and the standard deviation of the phase offsets being updated taking into account the phase offset of the new journey.

7. The method according to claim 1 , wherein each electronic device transmits to the central unit an acquisition period of said at least two acquisition sequences, said at least two acquisition sequences undergoing filtration in the associated electronic device and/or the central unit.

8. The method according to claim 1 , wherein the signals associated with the wheel speed sensors are resampled as a function of the period of said at least two sequences and undergo filtration similar to the filtration(s) of said at least two acquisition sequences.

9. The method according to claim 1 , wherein each acquisition sequence corresponds to a minimum wheel revolution and/or a period of an acquisition sequence of at least five milliseconds.

10. The method according to claim 1 , wherein sampling is performed at a fixed and predefined period of at least five milliseconds or a period calculated and adapted to the current speed in order to guarantee a fixed number of samplings per wheel revolution.

11. A motor vehicle comprising wheels each equipped with an electronic device which integrates at least one sensor for an operating parameter correlating to a rotation of the associated wheel and an emitter transmitting values of said at least one operating parameter to a central unit, the motor vehicle comprising a wheel speed sensor positioned close to each wheel which supplies data representative of the rotation of the associated wheel to said central unit, the central unit housed in the vehicle being firstly equipped with a receiver for receiving the values of said at least one parameter from the electronic devices, and secondly connected to each wheel speed sensor for receiving data representative of the rotation of each wheel, wherein it implements a method according to claim 1 , wherein each electronic device comprises means for implementing at least two sequences of several acquisitions correlating to the rotation of the wheel, the central unit comprises means for pairing a signal representative of said at least two sequences separately with each of the signals associated respectively with one of the wheel speed sensors, and means for measuring for each pair a phase difference between the signal correlating with the rotation of the wheel associated with the electronic device and the signal associated with each wheel speed sensor, means for identifying a constant phase difference between the signal correlating with the wheel rotation and a signal from one of the wheel speed sensors, and means for attribution and memorization of the electronic device for the wheel associated with the wheel speed sensor, the signal of which has shown a constant phase difference from the signal of the electronic device.

12. The motor vehicle according to claim 11 , wherein said at least one sensor of an operating parameter integrated in the electronic device correlating with a rotation of the associated wheel is taken individually or in combination from the following elements: a tangential and/or radial accelerometer, an impact sensor, a coil sensitive to the earth's magnetic field, a magneto-static sensor, and a Hall effect sensor.

13. The motor vehicle according to claim 12 , wherein when at least one sensor is a coil sensitive to the earth's magnetic field, a magneto-static sensor or a Hall effect sensor, the motor vehicle comprises a global positioning system on board the motor vehicle.

Assignees

• Continental Automotive France
• Continental Automotive Gmbh

Inventors

• Guinart Nicolas
• Plancke Sébastien

Classifications

• B60C23/0488

  Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force · CPC title

• B60C23/042 Primary

  cooperating with wheel hub mounted speed sensors · CPC title

• B60C23/0416 Primary

  allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right · CPC title

• B60C23/0489

  for detecting the actual angular position of the monitoring device while the wheel is turning · CPC title