METHOD FOR DETERMINING INNER FAILURE OF TIRE
First Claim
1. A method for determining an internal failure of a tire, comprising the steps of:
- detecting radial acceleration of a tire during vehicular travel by an acceleration sensor installed on an inner surface of the tire in a tread center area;
calculating a band value, which is a magnitude of vibrational components in a specific frequency band, from the detected radial acceleration;
comparing the calculated band value against a predetermined band value of a normal tire; and
determining the presence of an internal failure of the tire when the calculated band value is smaller than the band value of the normal tire,wherein the specific frequency band is a frequency band which includes the frequency of the second lowest peak of the peaks appearing in the frequency spectrum derived by performing a frequency analysis on the radial acceleration.
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Abstract
A method for accurately determining internal failures, such as separations, of a tire without affecting tire behaviors. Radial acceleration signals of a tire during vehicular travel are detected by an acceleration sensor (11) attached to the inner surface of the tire at the axial center of the tread. A frequency analysis is performed on the radial acceleration signals to obtain a frequency spectrum. A band value Xab is calculated of a specific frequency band [fa, fb] within the range of 100 Hz-400 Hz, which includes the frequency of the second lowest peak of the peaks appearing in the frequency spectrum. Then a check is made to see whether or not the difference between this band value Xab and a predetermined band value Yab of a normal tire exceeds a threshold value K. And when Yab−Xab>K, it is determined that an internal failure, such as a separation, is present in the tire.
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Citations
6 Claims
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1. A method for determining an internal failure of a tire, comprising the steps of:
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detecting radial acceleration of a tire during vehicular travel by an acceleration sensor installed on an inner surface of the tire in a tread center area; calculating a band value, which is a magnitude of vibrational components in a specific frequency band, from the detected radial acceleration; comparing the calculated band value against a predetermined band value of a normal tire; and determining the presence of an internal failure of the tire when the calculated band value is smaller than the band value of the normal tire, wherein the specific frequency band is a frequency band which includes the frequency of the second lowest peak of the peaks appearing in the frequency spectrum derived by performing a frequency analysis on the radial acceleration. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification