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:
Sep. 28, 1993
Filed:
Dec. 04, 1991
John C Walker, Sutton, GB;
Lavinder S Rehal, Walsgrave-on-Sowe, GB;
Sumitomo Rubber Industries Limited, Hyogo, JP;
Abstract
A method of detecting a deflated tire on a vehicle by comparing the rolling radii of the tires by comparing angular velocity speed signals from wheel speed sensors. One wheel speed sensor being provided at each wheel. Before the comparison of the signals is carried out, corrected wheel speed signals for each of the second, third and fourth wheels are calculated giving corrections for a set of factors comprising vehicle speed, lateral acceleration and longitudinal (fore/aft) acceleration. The corrections each comprise a constant for the factor concerned times the respective factor. The set of constants for each wheel is derived by taking the vehicle through a range of speeds, lateral and fore/aft accelerations and using multiple regression techniques and the respective factors are calculated from the set of uncorrected wheel speed signals so that comparison of the wheel speeds can be made without false signals from tire deflections caused by speed, lateral or fore/aft acceleration induced tire deflections.