Method and device of processing a signal sensed on board a vehicle from one of its wheels, and corresponding learning method
First Claim
1. A method of processing a signal sensed by a receiver installed on board a vehicle having a plurality of wheels fitted with respective detection and transmission modules, each detection and transmission module being capable of transmitting a detection signal including an indication of a state of the wheel fitted with said module, wherein the sensed signal is compared with a plurality of waveforms respectively stored in association with wheel positions to select a wheel position for which the stored waveform matches the sensed signal, wherein the comparison of the sensed signal with a waveform comprises, after pre-processing the sensed signal and identifying extrema of the pre-processed signal, applying a time transform to the pre-processed signal to align first and second extrema of the pre-processed signal with first and second extrema of said waveform to produce a time-transformed signal, whereby the selected wheel position is associated with a stored waveform which most closely matches the time-transformed signal.
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Accused Products
Abstract
Detection and transmission modules respectively fitted on several wheels of the vehicle are set up to transmit a detection signal incorporating an indication of a state of the wheel. The sensed signal is compared with several waveforms, respectively stored in relation to wheel positions, in order to select a wheel position for which the stored waveform matches the sensed signal. After pre-processing the sensed signal and identifying extrema of the pre-processed signal, the comparison between the sensed signal and a waveform comprises applying a time transform to the pre-processed signal to align first and second extrema of the pre-processed signal with first and second extrema of said waveform and computing a distance between the transformed signal and said waveform. The wheel position selected is the one for which the computed distance is minimum.
44 Citations
12 Claims
- 1. A method of processing a signal sensed by a receiver installed on board a vehicle having a plurality of wheels fitted with respective detection and transmission modules, each detection and transmission module being capable of transmitting a detection signal including an indication of a state of the wheel fitted with said module, wherein the sensed signal is compared with a plurality of waveforms respectively stored in association with wheel positions to select a wheel position for which the stored waveform matches the sensed signal, wherein the comparison of the sensed signal with a waveform comprises, after pre-processing the sensed signal and identifying extrema of the pre-processed signal, applying a time transform to the pre-processed signal to align first and second extrema of the pre-processed signal with first and second extrema of said waveform to produce a time-transformed signal, whereby the selected wheel position is associated with a stored waveform which most closely matches the time-transformed signal.
- 7. A, device for processing a signal sensed by a receiver installed on board a vehicle having several wheels fitted with respective detection and transmission modules, each detection and transmission module being capable of transmitting a detection signal including an indication of a state of the wheel fitted with said module, the device comprising means for pre-processing the sensed signal, means for identifying extrema of the pre-processed signal and means for comparing the sensed signal with a plurality of waveforms respectively stored in association with wheel positions to select a wheel position for which the stored waveform matches the sensed signal, wherein the means for comparing the sensed signal with a waveform comprise means for applying a time transform to the pre-processed signal to align first and second extrema of the pre-processed signal with first and second extrema of said waveform to produce a time-transformed signal, the wheel position being selected as being associated with a stored waveform which most closely matches the time-transformed signal.
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12. A method of learning waveforms for a device for processing a signal sensed by a receiver installed on board a vehicle having a plurality of wheels each fitted with a respective detection and transmission module, each detection and transmission module being capable of transmitting a detection signal including an indication of a state of the wheel fitted with said module, the method comprising the following steps for each of said vehicle wheels:
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recording a substantially periodic reference signal from a detection and transmission module;
determining the period of the reference signal after a pre-processing;
re-sampling a period of the pre-processed reference signal over N points, N being a predetermined number, and storing the re-sampled signal period;
additionally storing a position in time and a type (maximum or minimum) of each extremum within the stored signal period.
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Specification