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. 27, 2015
Filed:
Jan. 13, 2011
Yasushi Hanatsuka, Kodaira, JP;
Yasumichi Wakao, Kodaira, JP;
Hiroshi Morinaga, Kodaira, JP;
Kabushiki Kaisha Bridgestone, Tokyo, JP;
Abstract
A method capable of estimating a snowy road surface condition during vehicular travel in finer classification. In this method, tire vibrations in the circumferential direction, road surface temperature (T), and tire-generated sound are detected by an acceleration sensor, a road surface thermometer, and a microphone, respectively. Then band values P, Pand Pfor a pre-leading-edge region (R), band values P, Pand Pfor a leading-edge region (R), band values P, Pand Pfor a pre-trailing-edge region (R), band values Pand Pfor a trailing-edge region (R), and band values P, Pand Pfor a post-trailing-edge region (R) are calculated from the tire vibration data. A sound pressure level ratio (Q)=(P/P), which is the ratio of a band power value (P) of a low frequency band to a band power value (P) of a high frequency band, is calculated from data on the tire-generated sound. And a road surface condition is estimated, using the band values (P), road surface temperature data (T), sound pressure level ratio (Q), and wheel speed data.