Application US20200016943

METHOD FOR IDENTIFYING AT LEAST ONE TRANSMITTER FOR MONITORING THE PRESSURE OF A TIRE OF A MOTOR VEHICLE BY ASSOCIATION WITH ONE OF THE WHEELS OF SAID MOTOR VEHICLE
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US20200016943

1. A method for identifying at least one emitter for monitoring the pressure of a tire of a motor vehicle by association with one of the wheels of said motor vehicle, the motor vehicle moreover being equipped with an anti-lock braking system and with a receiver for monitoring the pressure of at least one tire, which is connected to an electronic control unit of the vehicle and able to communicate with the at least one emitter for monitoring the pressure, the method comprising: for each emitter for monitoring the pressure of a tire to be associated with one of the wheels of the vehicle, (4) (7)

an intermediate-frequency signal is reconstructed from the radiofrequency signal and from a reference signal, the intermediate-frequency signal being able to be demodulated by a processor with a view to extracting data carried by the radiofrequency signal,

determining a fast Fourier transform of the intermediate-frequency signal,

determining whether there is a frequency deviation of the intermediate-frequency signal by comparing the instantaneous value of the fast Fourier transform to the average value of the fast Fourier transform,

such is the case, determining whether an absolute value of the an amplitude of the deviation is higher than a threshold, periodic and positive,

determining the side of the vehicle on which the emitter for monitoring the pressure of a tire is placed depending on the a sign of the deviation,

acquiring a signal from the anti-lock braking system for at least one of the wheels on the side on which it was determined that the emitter for monitoring the pressure of a tire is placed, and

determining the position of the emitter for monitoring the pressure of a tire depending on the deviation and on the at least one signal from the anti-lock braking system.

2. The method as claimed in claim 1, wherein, to determine whether there is a frequency deviation depending on the instantaneous value of the fast Fourier transform and the average value of the fast Fourier transform, (3) (2)

the instantaneous value of the fast Fourier transform is subtracted from the average value of the fast Fourier transform, then it is determined whether the obtained signal is nonzero, and

if such is the case, it is determined that a frequency deviation is present.

7. The method as claimed in claim 2, wherein it is determined that the emitter for monitoring the pressure of a tire is placed on the same wheel as the wheel associated with an ABS if the deviation associated with the emitter and the signal derived from the ABS signal correspond at the end of a first preset number of wheel rotations. (0)

8. The method as claimed in claim 2, wherein it is determined that the emitter for monitoring the pressure of a tire is placed on a different wheel from the wheel associated with an ABS if the deviation associated with the emitter and the signal derived from the ABS signal do not correspond at the end of a second preset number of wheel rotations. (0)

9. The method as claimed in claim 2, wherein it is determined that an error exists when it is determined that at least two different emitters for monitoring the pressure of a tire are placed in the same location. (0)

3. The method as claimed in claim 1, wherein it is determined that the emitter for monitoring the pressure of a tire is placed on the same wheel as the wheel associated with an ABS if the deviation associated with the emitter and the signal derived from the ABS signal correspond at the end of a first preset number of wheel rotations. (1) (0)

4. The method as claimed in claim 1, wherein it is determined that the emitter for monitoring the pressure of a tire is placed on a different wheel from the wheel associated with an ABS if the deviation associated with the emitter and the signal derived from the ABS signal do not correspond at the end of a second preset number of wheel rotations. (0)

5. The method as claimed in claim 1, wherein it is determined that an error exists when it is determined that at least two different emitters for monitoring the pressure of a tire are placed in the same location. (1) (0)

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Application US20200016943

METHOD FOR IDENTIFYING AT LEAST ONE TRANSMITTER FOR MONITORING THE PRESSURE OF A TIRE OF A MOTOR VEHICLE BY ASSOCIATION WITH ONE OF THE WHEELS OF SAID MOTOR VEHICLE

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