Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Establissements Michelin

Societe Detechnologie Michelin

Antoine Paturle

Pierre-Alain Begou

Jean-Michel Vacherand

Oussama Bouhadida

Olivier Muhlhoff

Jean-Louis Linda

Marc Duvernier

Jean-Claude Desvignes

Antoine Ducloux

David Mosnier

Cédric Delbet

Clément Petit

Benjamin Levrard

Remi Cote

Jérôme Antoni

Pierre Nizet

Guillaume Chazal

Frédéric Terrettaz

Vincent Pilon

Rémi Cote

A method for determining the loading of a tire () mounted on a vehicle () and running along the ground, said tire () being equipped with a sensor (), comprises: acquisition, by the sensor (), of a measurement signal representative of the change in curvature of the tire () during running, determination, from the measurement signal, of measurement data comprising a first parameter representative of a length of a contact patch () in contact with the ground () during a revolution of the wheel bearing the tire, and determination of the loading of the tire () as a function of the first parameter, of the internal pressure of the tire, and of a firmness factor representative of a condition of firmness of the ground, which is derived from measurements taken while the tire is rolling over said ground.

Method for determining the load applied to a tire

A method for checking and/or monitoring the use of a tire () mounted on a vehicle (), comprises the following steps: acquisition, by a microphone () arranged inside the tire, of an acoustic response of said tire () obtained under the effect of a pulsed mechanical stress thereon, and processing of said response in the frequency domain, characterized in that said processing identifies, in the response in the frequency domain, two spectrum spikes situated on either side of a reference frequency corresponding to the first cavity mode of the tire and, as a function of the frequency deviation between the two duly identified spikes, determines information relating to at least one parameter of use of the tire.

Method for checking and/or monitoring the use of a tire

A method for determining a road condition is carried out aboard a vehicle driving on the road and comprises the following steps: capturing the noise created by the friction between at least one tire and the road; analyzing the noise signal in the high frequency range to determine whether the road condition is dry or not; and, in case the road condition is not dry, analyzing the noise signal in the low frequency range to determine whether to road condition is wet or damp.

Method and system for real-time estimation of road conditions and vehicle behavior

A device valuates the deformation of a tire casing, the device including: a tire casing having a rotation axis, including a crown and having a radial stiffness; when said tire casing is included in a mounted assembly, the footprint of the tire casing has a dimension Lin the axial direction; and an electronic device comprising one bending sensor, characterized in that the bending sensor includes an active part having a main dimension of between 10% and 80% of the dimension L, in that the active part of the sensor is located in line with the crown, in that the main dimension of the active part is oriented in the circumferential direction of the tire casing and in that the bending sensor has a bending stiffness that is lower than the radial stiffness of the tire casing.

Device for evaluating the deformation of a pneumatic tire casing

A method for evaluating the firmness of the ground on which is running a vehicle equipped with at least one mounted assembly having a radial stiffness kcomprising a tyre casing having a crown, two sidewalls and two beads, equipped with a sensor sensitive to the circumferential curvature and positioned in line with the crown, comprises the following steps: Estimating a value of the curvature &#x3c1;of the tire casing corresponding to first steady-state conditions of the tire casing in contact with the ground; and Evaluating the relative firmness of the ground with respect to the radial stiffness kof the mounted assembly as being a function of the value of the curvature &#x3c1;of the tire casing.

Method for evaluating the firmness of a ground

A method for mapping data relating to the conditions on a road, the method including the following steps: (a) a step for recording, in a database, information relating to the weather conditions on a road, determined by a vehicle travelling on the road, (b) a step for recording the GPS position of the vehicle corresponding to the recordings made, and (c) a step for displaying, on a map showing the route followed by the vehicle, the weather conditions as a function of the GPS position.

Method for mapping data relating to road conditions

A method for determining a limit speed for driving, for a driver at a vehicle's steering wheel, includes a step of estimating a grip potential available at a given instant between a tire of the vehicle and a roadway on which a tire of the vehicle is running. The grip potential is estimated as a function of at least one of: a known influencing parameter, and a measured influencing parameter. The method also includes a step of determining a need for grip as a function of a driving situation of the vehicle and driving characteristics of the driver. The method further includes a step of determining a limit speed for driving as a function of the need for grip and the estimated grip potential. By virtue of the limit speed for driving, it is possible to prevent exceeding an estimate grip potential available.

Method for determining a limit speed for driving

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.

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

A tire made of rubbery material comprising a sidewall and a pattern formed on this sidewall. This pattern comprises a plurality of openings and intermediate zones separating these openings. In order for the pattern to contrast with the sidewall, the openings occupy at least 60% of the pattern, these openings being distributed through the pattern at a density at least equal to five openings per square millimeter (mm), these openings having equivalent diameters of between 0.03 mm and 0.5 mm. A mold element for making the openings and and method of making the pattern using a laser.

Tire comprising a high contrast pattern comprising a plurality of cavities

A motor vehicle includes a rear bumper and a microphone. The rear bumper includes an internal cavity that is open towards a front portion of the vehicle. The microphone includes a sound pickup component arranged to acquire a sound signal generated by at least one tire of the vehicle, each of which includes at least one audible wear indicator. The sound pickup component of the microphone is attached to a wall of the rear bumper, and is positioned at a transverse level located between rear tires of the vehicle, preferably in the internal cavity.

Vehicle comprising means for detecting noise generated by a tyre

In a method for alerting to the wear of a tire that includes a tread strip equipped with at least one circumferential groove,

Alarm method for indicating the wear of a tyre with a groove

A method for detecting a wear condition of a tire utilizes tread pattern elements included on the tire. The elements are adapted to generate first and second acoustic footprint noises (BEA1, BEA2), with one of the first and second acoustic footprint noises being characteristic of the wear condition of the tire. According to the method, a parent frequency spectrum, which is capable of forming a frequency spectrum of one of the first and second acoustic footprint noises, and a child frequency spectrum, which is capable of forming a frequency spectrum of the other of the first and second acoustic footprint noises, are selected from a frequency spectrum of an acoustic signal acquired from the tire. Two detection confidence indices are determined. If each detection confidence index meets a predetermined condition, a warning is emitted indicating that tire wear has been detected.

Method of detecting wear of a tyre

A method for detecting wear of a tire involves at least one sonic wear gauge emitting an acoustic footprint noise that includes several acoustic footprint elementary frequency components. An acoustic signal that includes the acoustic footprint noise is acquired, with the acoustic signal including several elementary frequency components acquired in the frequency domain. Several series of elementary frequency components are enumerated, with each enumerated series forming some part of the acoustic footprint elementary frequency components. An acoustic footprint series is determined and, if a confidence index determined based on a local confidence index is greater or less than a predetermined threshold, an alert regarding the wear of the tire is emitted.

Method for detecting wear of a tyre containing a sonic wear gauge

Article () having at least one visible surface (), this surface comprising on at least part of it a pattern () contrasting with the surface of the article, this pattern () comprising a plurality of tufts () distributed over the entire said pattern, each tuft () having an average cross section between 0.003 and 0.06 mm. Also disclosed is a moulding process for forming a high-contrast pattern on a surface of an article that can be moulded in a mould, this process consisting in producing, at the position of the pattern on the surface of the mould, a plurality of cavities of average cross section between 0.003 and 0.06 mm.

Marking offering better visibility and marking method

A tire includes a tread strip configured in such a way that, beyond a predetermined radial wear threshold, at least one pair of first and second sounding cavities is exposed. Each first and second sounding cavity is arranged respectively in a first and second circumferential groove of the tread strip. Each sounding cavity of the pair is connected to the other sounding cavity of the pair by a sounding channel formed in the tread strip. Each cavity of the pair and the associated channel:

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Clermont-Ferrand, France

Antoine Paturle