Tread wear estimation system and method
First Claim
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1. A tire wear state estimation system comprising:
- a tire supporting a vehicle;
a vehicle-based sensor for measuring a plurality of distance intervals travelled by the tire during vehicle operation at different vehicle speeds;
a vehicle-based tire revolution counter for counting a tire revolution count within each of the plurality of distance intervals;
a vehicle-based speed sensor for determining the vehicle ground speed during the plurality of distance intervals travelled by the tire;
a slow-speed interval selector operative to select at least one slow-speed distance interval from the plurality of distance intervals operatively based on the vehicle travelling at a ground speed less than a pre-selected threshold level;
an effective radius estimator for estimating a slow-speed effective radius of the tire during the at least one slow-speed distance interval from the tire revolution count and the distance travelled by the tire during the at least one slow-speed distance interval; and
a tire wear-state estimator operative to estimate a tire wear-state from the estimated slow-speed effective radius of the tire during the at least one slow-speed distance interval.
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Abstract
A tire wear state estimation system for a tire calculates tire effective radius during measured distance intervals travelled by the tire from vehicle speed and tire rotation counters. The system includes a filter for selecting slow-speed effective radius measuring intervals and an estimator for estimating the tire effective radius during only those intervals in which the vehicle is travelling below a threshold speed.
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Citations
4 Claims
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1. A tire wear state estimation system comprising:
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a tire supporting a vehicle; a vehicle-based sensor for measuring a plurality of distance intervals travelled by the tire during vehicle operation at different vehicle speeds; a vehicle-based tire revolution counter for counting a tire revolution count within each of the plurality of distance intervals; a vehicle-based speed sensor for determining the vehicle ground speed during the plurality of distance intervals travelled by the tire; a slow-speed interval selector operative to select at least one slow-speed distance interval from the plurality of distance intervals operatively based on the vehicle travelling at a ground speed less than a pre-selected threshold level; an effective radius estimator for estimating a slow-speed effective radius of the tire during the at least one slow-speed distance interval from the tire revolution count and the distance travelled by the tire during the at least one slow-speed distance interval; and a tire wear-state estimator operative to estimate a tire wear-state from the estimated slow-speed effective radius of the tire during the at least one slow-speed distance interval. - View Dependent Claims (2, 3, 4)
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Specification