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Method for acoustic detection of the condition of the road and the tyre

A road and state technology, applied in tire measurement, material analysis using sonic emission technology, tire parts, etc., can solve problems such as the impact of use cost

Active Publication Date: 2016-08-03
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to combine data acquired from multiple sensors, which has some impact on the cost of use of the proposed device

Method used

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  • Method for acoustic detection of the condition of the road and the tyre
  • Method for acoustic detection of the condition of the road and the tyre
  • Method for acoustic detection of the condition of the road and the tyre

Examples

Experimental program
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Effect test

Embodiment Construction

[0042] like figure 1 As schematically shown in , a vehicle C running on a ground G includes front and rear wheel houses in which wheels mounted with tires T are accommodated.

[0043] When the vehicle C is moving, the tires T generate noise whose amplitude and frequency depend on a number of factors. This sound pressure is actually noise from different sources (e.g. noise due to contact of the tread units with the ground G, noise due to air movement between the tread units, noise due to water particles lifted by the tire generated noise, or noise due to air movement in relation to vehicle speed). These noises are received superimposed with noise related to the vehicle environment, such as engine noise. All of these noises also depend on the speed of the vehicle.

[0044] A receiving device such as the microphone 1 is installed in the wheel house as close as possible to the position where the running noise is generated to receive the running noise. Clearly, practical precau...

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Abstract

The invention provides a method for acoustic detection of the condition of the road and the tyre. The invention relates to a method for determining the condition of a road and the condition of a tyre, including the steps of: recording a measurement of the sound signal produced by the tyre traveling on the road during a given time interval; determining the spectral power density of the sound signal over a given frequency interval; segmenting the frequency interval into a plurality of frequency bands; and associating with each frequency band a piece of data representing the mean sound power measured in said frequency band, the representative data from a measurement forming the variables of a vector associated with said measurement; determining a condition of the road and of the tyre by means of a discriminant analysis of the data supported by a knowledge base. The representative data forming the variables of the vector associated with a measurement are obtained by calculating the ratio between the mean sound power measured in one frequency band and the total sound power measured over the entire frequency interval.

Description

technical field [0001] The invention relates to a method of detecting the condition of a road and a tire secured to a vehicle traveling on the road based on the noise produced by the tire when it comes into contact with the ground. Background technique [0002] In order to interact with the driver or with the driver assistance system, it is useful to know the road or tire conditions at each moment, so that the driver or the driver assistance system can be notified in good time of changes in driving conditions, and more generally, are the possible changes in the adhesion state of the tires and the handling state of the vehicle. [0003] These methods therefore aim at indicating changes in weather conditions, for example between driving on dry, wet, wet or snow-covered ground. These methods are based on the discovery that the frequency and intensity of the sounds produced by tires vary as the state of the road changes, and they analyze recordings made by microphones placed cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14B60C23/00G01H1/12G01N29/44G01N29/46
Inventor A·帕蒂勒J·安东尼
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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