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:
Oct. 28, 2014
Filed:
Sep. 01, 2010
Yasumichi Wakao, Kodaira, JP;
Yasumichi Wakao, Kodaira, JP;
Kabushiki Kaisha Bridgestone, Tokyo, JP;
Abstract
A simple method and apparatus for accurately estimating the contact patch shape of a moving tire. The vibration waveforms of a tire () with sipe rows (A,B) formed at the respective pitches (P, P) in the left and right shoulder lands () are detected by an acceleration sensor attached to a knuckle of the vehicle. Rotational order spectrums are obtained by performing a rotational order analysis on the vibration waveforms. The peak height (Z) of the rotational order (n) corresponding to the pitch (P) and the peak height (Z) of the rotational order (n) corresponding to the pitch (P) are extracted from the rotational order spectrums. The peak height (Z) is compared with the threshold value (K) to estimate whether the contact patch shape of the tire is longer than the contact patch length (L) of the tire contact patch shape (F) set as the use limit due to internal pressure drop or load increase, and the peak height (Z) is compared with the threshold value (K) to estimate whether it is shorter than the contact patch length (L) of the tire contact patch shape (F) set as the use limit due to internal pressure rise or load decrease.