The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 17, 2007
Filed:
Jul. 29, 2004
Michel Robert, Cellule, FR;
Michel Robert, Cellule, FR;
Michelin Recherche et Technique S.A., Granges-Paccot, CH;
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.