Abstract: In a method for alerting to the wear of a tire that includes a tread strip equipped with at least one circumferential groove, the running noise made by the tire running along a ground is measured, from the measured running noise, a noise emitted in a predetermined range of frequencies close to a predetermined resonant frequency of a portion of the circumferential groove during running is isolated, the amplitude of the isolated noise is measured, and the measured amplitude is compared against a predetermined alert threshold.

Abstract: 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.

Abstract: 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.

Abstract: Article (1) having at least one visible surface (11), this surface comprising on at least part of it a pattern (2) contrasting with the surface of the article, this pattern (2) comprising a plurality of tufts (21) distributed over the entire said pattern, each tuft (21) having an average cross section between 0.003 and 0.06 mm2. 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 mm2.

Abstract: A method for detecting a wear condition of a tyre utilizes tread pattern elements included on the tyre. 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 tyre. 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 tyre. Two detection confidence indices are determined. If each detection confidence index meets a predetermined condition, a warning is emitted indicating that tyre wear has been detected.

Abstract: 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: open radially to the outside of the tyre, and are configured so that they are closed by a ground surface in a substantially airtight manner as they pass through a contact patch where the tyre makes contact with the ground surface.

Abstract: A tyre includes a first-threshold projection and a second-threshold projection. The first-threshold projection extends radially from a bottom of a circumferential groove of the tyre. The first-threshold projection is arranged such that, once the tyre has exceeded a first wear threshold, the first-threshold projection comes into contact with a ground surface as the first-threshold projection passes through a contact area in which the tyre contacts the ground surface. The second-threshold projection extends radially from a bottom of a circumferential groove of the tyre. The second-threshold projection is arranged such that, once the tyre has exceeded a wear threshold indicative of a more advanced wear than the first wear threshold, the second-threshold projection comes into contact with the ground surface as the second-threshold projection passes through a contact area in which the tyre contacts the ground surface. A plurality of threshold projections may be evenly distributed circumferentially about the tyre.

Abstract: A rubber tire comprising a surface having, over at least a portion of this surface, a pattern comprising a plurality of bars placed substantially parallel with one another, each comprising a tip distant from the surface of the tire and a base materially integral with the tire. Each bar of the plurality of bars comprises two inclined walls extending on either side of the tip towards the base, the angle of inclination of each inclined walls less than or equal in absolute value to 25° relative to a direction perpendicular to the surface. The bases of the bars are not in contact with one another so that the bases of two adjacent bars delimit a residual surface between the bars. The width of the residual surface corresponding to a distance between the bases of the two adjacent bars is less than or equal to half the height of the adjacent bars, the height being between 0.1 mm and 0.8 mm.

Abstract: The tyre includes a tyre tread configured so that, beyond a predetermined radial wear threshold, the tyre tread has a set of at least one wear indicator, including a so-called “sound” cavity arranged in a circumferential groove of the tyre tread. During the monitoring method, an acoustic signal that is able to include an acoustic footprint noise produced by the set during the running of the tyre on a ground beyond the predetermined threshold is detected by an acoustic sensor mounted on the vehicle, and information relating to the acoustic signal is emitted to a remote server not mounted on the motor vehicle.

Abstract: A tyre includes a tread with at most 30 channels distributed substantially evenly circumferentially about the tyre. Each channel is arranged so that, beyond a predetermined wear threshold, the channel satisfies the following conditions: (A) the channel opens into a tread pattern element of the tyre, and (B) the channel includes a mouth opening radially to outside of the tyre and is delimited by at least two edge corners that come into contact with a ground surface as the edge corners pass through a contact patch in which the tyre is in contact with the ground surface, in which a circumferential distance separating the edge corners from one another is greater than or equal to 2 mm, and preferably is greater than or equal to 4 mm. Before the predetermined wear threshold is reached, at least one of the conditions (A) and (B) is not met.

Abstract: A tyre includes two sets of acoustic (sonic) wear indicators associated with two wear thresholds. Noise is generated when each wear threshold is exceeded. Each wear indicator of each set of wear indicators is axially aligned with each other wear indicator of that set of wear indicators. A number of sets of wear indicators associated with each wear threshold is different from a number of sets of wear indicators associated with each other wear threshold. The sets of wear indicators associated with each wear threshold are evenly distributed circumferentially about the tyre. Each wear indicator is formed of a projection of rubber extending from a bottom portion of a circumferential groove of the tyre.

Abstract: The wear detection method applies to a tyre (10) comprising NEi set(s) of acoustic wear indicators associated with at least two wear thresholds (S1, S2, S3, S4, S5, S6) so as to generate an acoustic fingerprint noise, at least when each threshold (S1, S2, S3, S4, S5, S6) has been exceeded. Each indicator of each set is substantially axially aligned with each other indicator of the set. For each threshold Si, kmin is the minimum value of the values of ki for i?[2, M] where M is the total number of wear thresholds, with: ki=NEi/NEi-1 when for the value of i?[2, M], NEi/NEi-1>1, or ki=NEi-1/NEi when for the value of i?[2, M], NEi-1/NEi>1 For each threshold Si, the acoustic fingerprint noise is detected at a speed V. The value of the speed V is limited to an interval I=[Vmin; Vmax] satisfying Vmax?kmin·Vmin.

Abstract: The invention relates to a method for designing a curing mould for a tyre comprising at least one audible wear indicator, including the following steps (200-210): an initial population is defined, comprising a mould model having at least one characteristic relating to the wear indicator, a modified population is generated, comprising at least one mould model having at least one characteristic relating to the wear indicator produced by modifying at least one characteristic of at least one mould model of the initial population, at least one performance indicator is determined for each mould model in an evaluation population comprising at least one mould model of the modified population, based on at least one characteristic of each mould model of the evaluation population, one or more mould models of the evaluation population are selected on the basis of the performance indicator or indicators.

Abstract: A tyre for a vehicle has at least two predetermined radial wear thresholds. Beyond each threshold, a tread of the tyre is configured in such a way that the tread includes at least one set of at least one cavity, known as a “sounding” cavity, associated with that threshold. If a set includes a plurality of cavities, each cavity of the set is substantially aligned axially with each other cavity of the set. A number of the set(s) of cavity/cavities associated with each threshold is different from a number of the set(s) of cavity/cavities associated with each other threshold. The sets of sounding cavities are arranged in such a way that, beyond each threshold, the set(s) of sounding cavity/cavities associated with that threshold are evenly circumferentially distributed about the tyre.

Abstract: In the course of the method for detecting the wear of a tyre (10) comprising a set of at least one sonic wear gauge (18) emitting an acoustic footprint noise comprising several acoustic footprint elementary frequency components, an acoustic signal liable to comprise the acoustic footprint noise is acquired (100), the acoustic signal comprising several elementary frequency components acquired in the frequency domain; several series of elementary frequency components are enumerated (206), each enumerated series being liable to form some part of the acoustic footprint elementary frequency components; an acoustic footprint series is selected (302) from among the enumerated series; a local confidence index of the acoustic footprint series is determined (306); if a confidence index determined on the basis of the local confidence index is greater or less than a predetermined threshold, an alert of the wear of the tyre (10) is emitted.

Abstract: In the course of the method for detecting wear of a tyre comprising a tread and exhibiting at least two predetermined thresholds Si of radial wear: beyond each threshold Si, the tread is devised so that it comprises NEi set(s) of sonic cavities associated with the threshold Si; and for each threshold Si, Kmin is the minimum value of the values of ki with: ki=NEi/NEi-1 when for the value of i ? [2, M], NEi/NEi-122 1, or ki=NEi-1/NEi when for the value of i ? [2, M], NEi-1/NEi>1 for each threshold, an acoustic footprint noise emitted by the sonic cavity or cavities associated with this threshold is detected at a speed V, and the value of the speed V for detecting the acoustic footprint noise is limited to an interval I=]Vmin; Vmax] satisfying Vmax?kmin·Vmin.

Abstract: The tyre includes a tyre tread configured so that, beyond a predetermined radial wear threshold, the tyre tread has a set of at least one wear indicator, including a so-called “sound” cavity arranged in a circumferential groove of the tyre tread. During the monitoring method, an acoustic signal that is able to include an acoustic footprint noise produced by the set during the running of the tyre on a ground beyond the predetermined threshold is detected by an acoustic sensor mounted on the vehicle, and information relating to the acoustic signal is emitted to a remote server not mounted on the motor vehicle.

Abstract: A tyre 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: open radially to the outside of the tyre, and are configured so that they are closed by a ground surface in a substantially airtight manner as they pass through a contact patch where the tyre makes contact with the ground surface.

Abstract: In a method for alerting to the wear of a tyre that includes a tread strip equipped with at least one circumferential groove, the running noise made by the tyre running along a ground is measured, from the measured running noise, a noise emitted in a predetermined range of frequencies close to a predetermined resonant frequency of a portion of the circumferential groove during running is isolated, the amplitude of the isolated noise is measured, and the measured amplitude is compared against a predetermined alert threshold.

Abstract: Article (1) having at least one visible surface (11), this surface comprising on at least part of it a pattern (2) contrasting with the surface of the article, this pattern (2) comprising a plurality of tufts (21) distributed over the entire said pattern, each tuft (21) having an average cross section between 0.003 and 0.06 mm2. 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 mm2.