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. 18, 2011
Filed:
May. 30, 2007
Masashi Kitano, Kobe, JP;
Masashi Kitano, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Hyogo, JP;
Abstract
An object is to provide a method capable of reducing calculation number of times for obtaining a primary regression line of a slip ratio and acceleration, and detecting a decrease in internal pressure of tires with high accuracy even in the case where is no evenness in a road surface. The present invention is a method for alarming decrease in tire air-pressure including the steps of: detecting rotational information obtained from tires installed in a vehicle; respectively calculating a wheel velocity, a vehicle acceleration and a slip ratio of the front wheel and a slip ratio of the rear wheel from the rotational information of the respective tires; accumulating the vehicle acceleration and the slip ratio of the front wheel and the slip ratio of the rear wheel; obtaining a primary regression coefficient of the vehicle acceleration and the slip ratio of the front wheel and the slip ratio of the rear wheel; and judging whether or not the tires are decreased in the air pressure upon comparing the primary regression coefficient and a reference value of the primary regression coefficient preliminarily calculated in the above step when air pressure in the tires is the reference internal pressure.