Sensor-incorporated tire and tire condition estimating method
First Claim
1. A sensor-incorporating tire which incorporates sensors for detecting the conditions of a running tire, comprising:
- at least two tire input detection means for detecting an input from the road which acts on a tire tread portion, which are buried in a tread rubber on the outer side in the radial direction of a tire belt layer;
wherein two of the tire input detection means are arranged at linearly symmetrical positions which are equally distant in the axial direction from the center in the axial direction of the tire.
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Accused Products
Abstract
In order to accurately and stably estimate the conditions of a running tire, a vehicle is equipped with a sensor-incorporating tire having, at an equal distance from the center in the axial direction of the tire, pressure sensors (11A, 11B) buried in a tread rubber positioned on the outer side in the radial direction of the tire belt layer of a tire tread portion and on the inner sides in the radial direction of tread blocks, the contact length LA of the car body side and the contact length LB of the opposite side of the center in the axial direction of the tire are detected by using the duration times of pressure values from the pressure sensors (11A, 11B) and a wheel speed from a wheel speed sensor (14), and the ratio R=LA/LB of the contact length LA to the contact length LB is computed to estimate lateral force generated by the tire, or the average contact length LAB which is the average value of the contact lengths LA and LB is computed to determine a load applied to the tire.
17 Citations
14 Claims
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1. A sensor-incorporating tire which incorporates sensors for detecting the conditions of a running tire, comprising:
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at least two tire input detection means for detecting an input from the road which acts on a tire tread portion, which are buried in a tread rubber on the outer side in the radial direction of a tire belt layer; wherein two of the tire input detection means are arranged at linearly symmetrical positions which are equally distant in the axial direction from the center in the axial direction of the tire. - View Dependent Claims (2, 3, 4)
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5. A tire condition estimating method comprising the steps of:
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detecting the contact lengths of at least two locations of a tire tread portion by using wheel speed measuring means, and a sensor-incorporating tire comprising at least two tire input detection means for detecting an input from the road which acts on a tire tread portion, which are buried in a tread rubber on the outer side in the radial direction of a tire belt layer; and estimating the conditions of a running tire based on the detected contact lengths. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A tire condition estimating method comprising the steps of:
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monitoring the ratio of tire input detection values at linearly symmetrical positions which are equally distant in the axial direction from the center in the tire axial direction of the tire tread portion obtained by using a sensor-incorporating tire comprising at least two tire input detection means for detecting an input from the road which acts on a tire tread portion, which are buried in a tread rubber on the outer side in the radial direction of a tire belt layer; and estimating that the unsymmetrical wear of the tire proceeds when the ratio exceeds a preset threshold value for a predetermined time or longer.
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Specification