TYRE HAVING MULTI-LEVEL AUDIBLE WEAR INDICATORS
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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 ε [2, M], NEi/NEi-122 1, or
- ki=NEi-1/NEi when for the value of i ε [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.
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Citations
30 Claims
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1-15. -15. (canceled)
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16. A method for detecting wear of a tyre that includes a tread and that exhibits at least two predetermined thresholds of radial wear, the method comprising steps of:
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providing a tyre with a plurality of thresholds Si, the tyre being structured such that; beyond each threshold Si, a tread of the tyre includes NEi sets of at least one sonic cavity associated with that threshold Si, and for each threshold Si, kmin is a minimum value of values of ki for i ∈
[2, M], where M is a total number of predetermined thresholds of radial wear, with;k1=NEi/NEi-1 when, for a value of i ∈
[2, M], NEi/NEi-1>
1, orki=NEi-1/NEi when, for the value of i ∈
[2, M], NEi-1/NEi>
1; andfor each threshold Si, detecting an acoustic footprint noise emitted by at least one sonic cavity associated with the threshold Si at a speed V, wherein, in the step of detecting the acoustic footprint noise, a value of the speed V is limited to an interval I=]Vmin;
Vmax] satisfying Vmax<
kmin·
Vmin, andwherein, if a set includes a plurality of sonic cavities, the plurality of sonic cavities of the set are substantially aligned axially with one another. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A programmed computer configured to detect wear of a tyre that includes a tread and that exhibits a plurality of thresholds Si of radial wear, the tyre being structured such that:
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beyond each threshold Si, a tread of the tyre includes NEi sets of at least one sonic cavity associated with that threshold Si, wherein, if a set includes a plurality of sonic cavities, the plurality of sonic cavities of the set are substantially aligned axially with one another, and for each threshold Si, kmin is a minimum value of values of ki for i ∈
[2, M], where M is a total number of predetermined thresholds of radial wear, with;ki=NEi/NEi-1 when, for a value of i ∈
[2, M], NEi/NEi-1>
1, orki=NEi-1/NEi when, for the value of i ∈
[2, M], NEi-1/NEi>
1,the programmed computer comprising computer code for detecting, for each threshold Si, an acoustic footprint noise emitted by at least one sonic cavity associated with the threshold Si at a speed V, wherein, in the detecting of the acoustic footprint noise, a value of the speed V is limited to an interval I=]Vmin;
Vmax] satisfying Vmax<
kmin·
Vmin.
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29. A non-transient computer-readable storage medium storing computer code that, when executed by a computer, causes the computer to detect wear of a tyre that includes a tread and that exhibits a plurality of thresholds Si of radial wear, the tyre being structured such that:
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beyond each threshold Si a tread of the tyre includes NEi sets of at least one sonic cavity associated with that threshold Si, wherein, if a set includes a plurality of sonic cavities, the plurality of sonic cavities of the set are substantially aligned axially with one another, and for each threshold Si, kmin is a minimum value of values of ki for i ∈
[2, M], where M is a total number of predetermined thresholds of radial wear, with;ki=NEi/NEi-1 when, for a value of i ∈
[2, M], NEi/NEi-1>
1, orki=NEi-1/NEi when, for the value of i ∈
[2, M], NEi-1/NEi>
1,the computer code comprising code that detects, for each threshold Si, an acoustic footprint noise emitted by at least one sonic cavity associated with the threshold Si at a speed V, wherein, in the detecting of the acoustic footprint noise, a value of the speed V is limited to an interval I=]Vmin;
Vmax] satisfying Vmax<
kmin·
Vmin.
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30. A method for detecting wear of a tyre that includes a tread and that exhibits a plurality of thresholds Si of radial wear, the tyre being structured such that:
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beyond each threshold Si, a tread of the tyre includes NEi sets of at least one sonic cavity associated with that threshold Si, wherein, if a set includes a plurality of sonic cavities, the plurality of sonic cavities of the set are substantially aligned axially with one another, and for each threshold Si, kmin is a minimum value of values of ki for i ∈
[2, M], where M is a total number of predetermined thresholds of radial wear, with;ki=NEi/NEi-1 when, for a value of i ∈
[2, M], NEi/NEi-1>
1, ork1=NEi-1/NEi when, for the value of i ∈
[2, M], NEi-1/NEi>
1,the method comprising steps of; installing on a first computer connected to a telecommunications network, computer code for detecting, for each threshold Si, an acoustic footprint noise emitted by at least one sonic cavity associated with the threshold Si at a speed V, wherein, in the detecting of the acoustic footprint noise, a value of the speed V is limited to an interval I=]Vmin;
Vmax] satisfying Vmax<
kmin·
Vmin; andenabling the computer code to be downloaded by a second computer connected to the telecommunications network.
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Specification