Method and systems for measuring the degree of wear on a tire

Details Method and systems for measuring the degree of wear on a tire Method and systems for measuring the degree of wear on a tire

2007-04-17

2007-04-17

Allen, Andre J. (Department: 2855)

Measuring and testing

Tire, tread or roadway

Reexamination Certificate

active

10902558

ABSTRACT:
A method for detecting wear on a tire at one or more predetermined wear thresholds in tread pattern elements of the tire includes the steps of allocating a discrete wear variable to the tread pattern element to a discrete impedance variable representing the impedance of a passive tuned circuit contained in at least one of the elements. A system according to the invention for implementing this method comprises a detection unit intended to be incorporated in a tire and containing the passive circuit which is covered with rubber, the passive circuit comprising a coil and n (n≧1) capacitor or capacitors connected in parallel to the terminals of the coil, and an active interrogation circuit to which the passive circuit is coupled, which is mounted fixed to the wheel and which comprises a frequency-sweep energy generator and a means of detecting the tuning frequencies between the passive circuit and the interrogation circuit.

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