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:
Nov. 17, 1998
Filed:
Jul. 02, 1993
David Jones, Staffs, GB;
Sumitomo Rubber Industries, Ltd., Hyogo-ken, JP;
Abstract
A method of detecting a deflated tire on a vehicle by comparing the rolling radii of the tires by means of comparing angular velocity speed signals from wheel speed sensors one at each wheel characterized by calculating an error value (DEL') where DEL'=��(C1+C4)/2-(C2+C3)/2!.times.100!/�(C1+C2+C3+C4)/4! where C1, C2, C3 and C4 are angular velocity values for left-hand front, right-hand front, left-hand rear and right-hand rear wheels of the vehicle respectively, determining a correction factor LAT, calculating a corrected error value DEL wherein in the case that the sign of the product LAT.times.A of the correction factor LAT and the vehicle related constant A is opposite to the sign of the error value DEL' then the corrected error value DEL is given by DEL=DEL', and in the case that the product LAT.times.A and the error value DEL' have the same sign but the product LAT.times.A is greater in absolute magnitude then the error value DEL' the corrected error value DEL is given by DEL=0, otherwise the corrected error value DEL is given by DEL=DEL'-(LAT.times.A) and a tire warning indicator is operated in the vehicle to indicate that at least one tire is deflected when it is sensed that the magnitude of the corrected error value DEL is in the range 0.05 to 0.5.