METHOD FOR ACOUSTIC DETECTION OF THE CONDITION OF THE ROAD AND THE TIRE
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Accused Products
Abstract
In a method for determining conditions of a road and a tire, a measurement of a sound signal produced by the tire running on the road during a timeframe is recorded, and a spectral density of a power of the sound signal over a frequency interval is determined. The frequency interval is segmented into frequency bands, and each frequency band is associated with a representative data element representing a mean acoustic power measured in the frequency band. The representative data elements obtained from the measurement form variables of a vector associated with the measurement. A road condition and a tire condition are determined via a discriminant analysis of the representative data elements using a learning base. Each representative data element is obtained by finding a ratio between a mean acoustic power measured in a corresponding frequency band and a total acoustic power measured over an entirety of the frequency interval.
14 Citations
30 Claims
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1-15. -15. (canceled)
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16. A method of determining a condition of a road and a condition of a tire fitted on a vehicle travelling on the road, the method comprising steps of:
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recording a measurement of a sound signal produced by the tire running on a surface of the road during a given time frame; determining a spectral density of a power of the sound signal over a given frequency interval; segmenting the given frequency interval into a plurality of frequency bands of pre-determined width, each frequency band being associated with a representative data element representing a mean acoustic power measured in that frequency band, the representative data elements obtained from the measurement forming variables of a vector associated with the measurement; and determining a road condition and a tire condition corresponding to the vector associated with the measurement by analysing the representative data elements using a discriminant-analysis technique and using a learning base that includes a set of vectors associated with previously recorded measurements made by the steps of the method, in known running conditions, according to modalities that each represent a given road condition or a given tire condition, wherein each of the representative data elements forming the variables of the vector associated with the measurement is obtained by finding a ratio between the mean acoustic power measured in the frequency band corresponding to the representative data element and a total acoustic power measured over a whole of the given frequency interval. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification