WEAR AMOUNT DETECTION DEVICE FOR AUTOMOBILE TIRES
First Claim
1. A wear amount detection device for a tire of an automobile, the wear amount detection device detecting a wear amount of the tire, the wear amount detection device comprising:
- a rotation sensor configured to detect a rotation signal of a wheel so as to measure a speed of the automobile;
a signal processing unit configured to;
extract rotation speed fluctuations synchronized with the rotation, from the rotation signal detected by the rotation sensor; and
obtain, from the extracted rotation speed fluctuations, rotation speed fluctuation patterns over a plurality of rotations, each of the rotation speed fluctuation patterns including a rotation speed fluctuation synchronized with the corresponding rotation; and
a wear state determination unit configured to;
determine, in the obtained rotation speed fluctuation patterns, a component value induced by a characteristic embodied in the tire, the component value varying in accordance with a wear state of the tire;
estimate a wear state of the tire on the basis of the determined component value; and
output wear information.
1 Assignment
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Accused Products
Abstract
Provided is a wear amount detection device that is able to detect that a tire is in a worn state, during running, without a special sensor while suppressing an increase in cost. The device includes: a rotation sensor (2) detecting rotation of a wheel (1) to measure a speed of an automobile; a signal processing (3) extracting rotation speed fluctuations synchronized with rotation, from a rotation signal detected by the rotation sensor, and obtain a rotation speed fluctuation pattern synchronized with rotation, from rotation speed fluctuations over a plurality of rotations; and a wear state determination (4) configured to: obtain, from the obtained pattern, a value of a component induced by a characteristic embodied in a tire (1a) of the wheel (1), the value varying in accordance with a wear state of the tire (1a); estimate a wear state of the tire (1a); and output the state.
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Citations
15 Claims
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1. A wear amount detection device for a tire of an automobile, the wear amount detection device detecting a wear amount of the tire, the wear amount detection device comprising:
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a rotation sensor configured to detect a rotation signal of a wheel so as to measure a speed of the automobile; a signal processing unit configured to;
extract rotation speed fluctuations synchronized with the rotation, from the rotation signal detected by the rotation sensor; and
obtain, from the extracted rotation speed fluctuations, rotation speed fluctuation patterns over a plurality of rotations, each of the rotation speed fluctuation patterns including a rotation speed fluctuation synchronized with the corresponding rotation; anda wear state determination unit configured to;
determine, in the obtained rotation speed fluctuation patterns, a component value induced by a characteristic embodied in the tire, the component value varying in accordance with a wear state of the tire;
estimate a wear state of the tire on the basis of the determined component value; and
output wear information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification