Indirect tire wear state prediction system and method
First Claim
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1. A tire wear state estimation system comprising:
- a plurality of tires supporting a vehicle;
a plurality of tire-mounted devices provided on at least one tire of the plurality of tires operable to supply tire-specific contact dynamics information;
at least one inertial measurement unit operable to supply sliding velocity information from a tire contact patch formed by the at least one tire rolling over a ground surface;
an ambient condition monitoring system operable to supply ambient condition information;
a tire force and sliding velocity estimator operable to determine a tire force estimate and a tire sliding velocity estimate from the tire-specific contact dynamics information and the sliding velocity information;
a tire frictional energy estimator operable to estimate tire frictional energy from the tire force estimate and the tire sliding velocity estimate;
a tire frictional work estimator operable to determine a tire frictional work estimate from the tire frictional energy estimate; and
a tire wear rate estimator operable to generate a tire wear rate estimate from the tire frictional work estimate and the ambient condition information.
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Abstract
A tire wear state estimation system estimates forces and sliding velocity generated in a tire contact patch, determines frictional energy from the tire force and sliding velocity, and generates an estimate of tire wear state based upon the frictional work done by the tire. A tire wear estimate, pursuant to the system and methodology, is made by determining the amount of frictional work performed by the tire through the integrated use of tire-mounted, GPS sourced, and vehicle-mounted sensor information.
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Citations
18 Claims
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1. A tire wear state estimation system comprising:
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a plurality of tires supporting a vehicle; a plurality of tire-mounted devices provided on at least one tire of the plurality of tires operable to supply tire-specific contact dynamics information; at least one inertial measurement unit operable to supply sliding velocity information from a tire contact patch formed by the at least one tire rolling over a ground surface; an ambient condition monitoring system operable to supply ambient condition information; a tire force and sliding velocity estimator operable to determine a tire force estimate and a tire sliding velocity estimate from the tire-specific contact dynamics information and the sliding velocity information; a tire frictional energy estimator operable to estimate tire frictional energy from the tire force estimate and the tire sliding velocity estimate; a tire frictional work estimator operable to determine a tire frictional work estimate from the tire frictional energy estimate; and a tire wear rate estimator operable to generate a tire wear rate estimate from the tire frictional work estimate and the ambient condition information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A tire wear state estimation system comprising:
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a plurality of tires supporting a vehicle; a plurality of tire-mounted devices provided on at least one tire of the plurality of tires operable to supply tire-specific information affecting tire contact patch dynamics; at least one inertial measurement unit operable to supply sliding velocity information from a tire contact patch formed by the at least one tire rolling over a ground surface; a friction work estimator operable to calculate a friction work estimate done by the at least one tire from the tire-specific information and the sliding velocity information; a tire wear rate estimator operable to generate a tire wear rate estimation from drawing a proportional correlation between an abradability factor of the at least one tire and the calculated friction work estimate. - View Dependent Claims (10, 11, 12, 13)
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14. A method of making a tire wear state estimation comprising:
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supporting a vehicle by a plurality of tires; mounting a plurality of tire-specific information-providing devices to at least one tire of the plurality of tires operable to supply tire-specific information affecting tire contact patch dynamics; utilizing at least one inertial measurement unit to supply sliding velocity information from a tire contact patch formed by the at least one tire rolling over a ground surface; employing a friction work estimator operable to calculate a friction work estimate done by the at least one tire from the tire-specific information and the sliding velocity information; employing a tire wear rate estimator operable to generate a tire wear rate estimation from drawing a proportional correlation between an abradability factor of the at least one tire and the calculated friction work estimate. - View Dependent Claims (15, 16, 17, 18)
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Specification