METHOD FOR ESTIMATING TIRE WEAR AND APPARATUS FOR ESTIMATING TIRE WEAR
First Claim
1. A method for estimating wear of a tire, comprising:
- detecting a radial acceleration of the tire with an acceleration sensor disposed on an inner surface side of a tire tread;
calculating a standardized deformation speed in a radial direction of the tire at a contact edge of the tire tread from the radial acceleration of the tire;
calculating a tread vibration level at a specific position and in a specific frequency range from the radial acceleration of the tire, the specific position being in a portion outside a contact patch of the tire tread and the tread vibration level changing with road surface roughness;
correcting the standardized deformation speed based on the tread vibration level; and
estimating a degree of tire wear based on the corrected standardized deformation speed.
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Accused Products
Abstract
The degree of tire wear is estimated with constancy and accuracy even when the road surface becomes rough during a vehicular run. The deformation speeds Vtf and Vtk of the tread of the tire are obtained respectively by calculating the levels of peaks Pf and Pk at contact edges appearing in the differentiated waveform of radial acceleration detected by an acceleration sensor 11 installed on the inner surface in the inner liner region of the tire. An average standardized deformation velocity Vnt is calculated as the average of the absolute values of leading-edge-side standardized deformation speed Vntf and trailing-edge-side standardized deformation speed Vntk, which are obtained by standardizing the Vtf and Vtk using the rotation time Tr of the tire. At the same time, an extra-contact-patch vibration level v of the tread is detected from the radial acceleration having passed through a bandpass filter 16. And a degree M of tire wear is estimated, using the average standardized deformation speed Vnt, the extra-contact-patch vibration level v, and a map 18M.
35 Citations
8 Claims
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1. A method for estimating wear of a tire, comprising:
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detecting a radial acceleration of the tire with an acceleration sensor disposed on an inner surface side of a tire tread; calculating a standardized deformation speed in a radial direction of the tire at a contact edge of the tire tread from the radial acceleration of the tire; calculating a tread vibration level at a specific position and in a specific frequency range from the radial acceleration of the tire, the specific position being in a portion outside a contact patch of the tire tread and the tread vibration level changing with road surface roughness; correcting the standardized deformation speed based on the tread vibration level; and estimating a degree of tire wear based on the corrected standardized deformation speed. - View Dependent Claims (3, 4, 5, 6, 7)
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2. A method for estimating wear of a tire, comprising:
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detecting a radial acceleration of the tire with an acceleration sensor disposed on an inner surface side of a tire tread; calculating a standardized deformation speed in a radial direction of the tire at a contact edge of the tire tread from the radial acceleration of the tire; calculating a tread vibration level at a specific position and in a specific frequency range from the radial acceleration of the tire, the specific position being in a portion outside a contact patch of the tire tread and the tread vibration level changing with road surface roughness; and correcting a degree of tire wear estimated from the standardized deformation speed, based on the tread vibration level.
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8. An apparatus for estimating wear of a tire, comprising:
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an acceleration sensor disposed on an inner surface side of a tire tread for detecting a radial acceleration of the tire; a means for calculating a standardized deformation speed in a radial direction of the tire at a contact edge of a tire tread from the detected radial acceleration of the tire; a means for calculating a tread vibration level from the detected radial acceleration of the tire; a means for correcting the calculated standardized deformation speed based on the detected tread vibration level; and a means for estimating a degree of tire wear based on the corrected standardized deformation speed.
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Specification