Indirect tire wear state estimation system
First Claim
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1. A tire wear state estimation system comprising:
- a tire supported by a wheel and supporting a vehicle;
a vehicle-based sensor for measuring a wheel speed of the wheel supporting the tire and generating a wheel speed signal;
a feature-extracting processor for extracting from the wheel speed signal a median slip-ratio of the tire, wherein the median slip-ratio of the tire is operably determined by a statistical analysis of the wheel speed signal;
a feature-extracting processor for extracting from the wheel speed signal a slip-ratio rate of the tire, wherein the slip-ratio rate of the tire is operably determined by a statistical analysis of the wheel speed signal;
a data classifier receiving as data inputs median slip-ratio data and slip-ratio rate data;
the data classifier operable to conduct a classification of the median slip-ratio data relative to the slip-ratio rate data to estimate a wear state for the tire.
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Abstract
A tire wear state estimation system includes a vehicle-based sensor for measuring wheel speed of a tire-supporting and first and second features extracted from the wheel speed signal. A data classifier conducts a classification of the first extraction feature data relative to the second extraction feature data by a statistical analysis of the wheel speed signal to estimate the wear state of the tire.
51 Citations
6 Claims
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1. A tire wear state estimation system comprising:
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a tire supported by a wheel and supporting a vehicle; a vehicle-based sensor for measuring a wheel speed of the wheel supporting the tire and generating a wheel speed signal; a feature-extracting processor for extracting from the wheel speed signal a median slip-ratio of the tire, wherein the median slip-ratio of the tire is operably determined by a statistical analysis of the wheel speed signal; a feature-extracting processor for extracting from the wheel speed signal a slip-ratio rate of the tire, wherein the slip-ratio rate of the tire is operably determined by a statistical analysis of the wheel speed signal; a data classifier receiving as data inputs median slip-ratio data and slip-ratio rate data;
the data classifier operable to conduct a classification of the median slip-ratio data relative to the slip-ratio rate data to estimate a wear state for the tire. - View Dependent Claims (2, 3, 4)
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5. A tire wear state estimation system comprising:
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a tire supported by a wheel and supporting a vehicle; a vehicle-based sensor for measuring a wheel speed of the wheel supporting the tire and generating a wheel speed signal; a feature-extracting processor for extracting from the wheel speed signal a median slip-ratio of the tire, the median slip-ratio of the tire quantitatively changing responsive to a wear level change of the tire, and wherein the median slip-ratio of the tire is operably determined by a statistical analysis of the wheel speed signal; a feature-extracting processor for extracting from the wheel speed signal a slip-ratio rate of the tire, the slip-ratio rate of the tire quantitatively changing responsive to a wear level change of the tire, and wherein the slip-ratio rate of the tire is operably determined by a statistical analysis of the wheel speed signal; a data classifier receiving as inputs median slip-ratio data and slip-ratio rate data;
the data classifier operable to conduct a classification of the median slip-ratio data relative to the slip-ratio rate data;a wear state estimator operable to estimate a wear state for the tire based upon the classification of the median slip-ratio data relative to the slip-ratio rate data. - View Dependent Claims (6)
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Specification