Apparatus for estimating tire wear amount and a vehicle on which the apparatus for estimating tire wear is mounted
First Claim
1. An apparatus for estimating tire wear amount comprising:
- a vehicle longitudinal acceleration measuring unit installed to a vehicle body side of a vehicle and measuring longitudinal acceleration of the driven vehicle;
a wheel rotation velocity measuring unit of measuring rotation velocity of a wheel of the vehicle;
a calculating unit of calculating changing amount of measured rotation velocity of the wheel based on rotation velocity of the wheel; and
a wear amount estimating unit of estimating wear amount of the tire mounted on the vehicle from the measured longitudinal acceleration ax measured by the acceleration measuring unit and the calculated changing amount of wheel rotation velocity Vw0 calculated by the calculating unit for calculating the changing amount of measured rotation velocity of the wheel.
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Accused Products
Abstract
A vehicle velocity detector 15 is provided, velocity V is detected from position data of the vehicle calculated by using signal from satellites, which is received by a GPS receiver 11 installed to a vehicle body, wheel rotation velocity Vw0 detected by a wheel velocity sensor 12 is corrected in accordance with tire inner pressure detected by a pressure sensor 13 so as to obtain wheel rotation velocity (correction value) Vw, velocity ratio R=(Vw/V), which is ratio of the corrected wheel rotation velocity Vw and the detected wheel velocity V, is calculated and tire wear amount is estimated in accordance with velocity ratio R so that tire wear amount can be measured precisely without processing the tire tread portion.
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Citations
9 Claims
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1. An apparatus for estimating tire wear amount comprising:
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a vehicle longitudinal acceleration measuring unit installed to a vehicle body side of a vehicle and measuring longitudinal acceleration of the driven vehicle; a wheel rotation velocity measuring unit of measuring rotation velocity of a wheel of the vehicle; a calculating unit of calculating changing amount of measured rotation velocity of the wheel based on rotation velocity of the wheel; and a wear amount estimating unit of estimating wear amount of the tire mounted on the vehicle from the measured longitudinal acceleration ax measured by the acceleration measuring unit and the calculated changing amount of wheel rotation velocity Vw0 calculated by the calculating unit for calculating the changing amount of measured rotation velocity of the wheel. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for estimating tire wear amount comprising:
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a vehicle longitudinal acceleration measuring unit installed to a vehicle body side of a vehicle and measuring longitudinal acceleration of the driven vehicle; a wheel rotation velocity measuring unit of measuring rotation velocity of a wheel of the vehicle; a calculating unit for calculating a changing amount of measured rotation velocity of the wheel and; a wear amount estimating unit of estimating wear amount of the tire mounted on the vehicle from the measured longitudinal acceleration ax measured by the longitudinal acceleration measuring unit and the calculated changing amount of wheel rotation velocity Vw0 calculated by the calculating unit for calculating the changing amount of measured rotation velocity of the wheel, wherein a wheel rotation acceleration aw=(dVw0/dt), which is a ratio with respect to the changing amount of wheel rotation velocity Vw0, is calculated and, an acceleration ratio S=(aw/ax), which is ratio of wheel rotation acceleration aw with respect to the vehicle longitudinal acceleration ax, is calculated and the tire wear amount is estimated in accordance with acceleration ratio S. - View Dependent Claims (7, 8, 9)
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Specification