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:
Feb. 05, 2008
Filed:
Jan. 28, 2005
Method for warning deflation of tires and system thereof, and judgment program of deflation of tires
Hiroaki Kawasaki, Kobe, JP;
Hiroaki Kawasaki, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe-Shi, JP;
Abstract
A method for warning deflation of tires which can detect the deflation of 2 wheels at the same axle including a following axle, the simultaneous deflation of 4 wheels or the abrasion of tires only by the information of wheel speeds is provided. The method comprises the steps of: detecting the rotational information of each of tires; calculating and storing wheel speeds, vehicle accelerations, slip ratios of front and rear wheels, traveling distances and radius of traveling circle from the rotational information of said respective tires; calculating moving average of the vehicle accelerations and the slip ratios of front and rear wheels; accumulating the traveling distances and storing the moving averages of the vehicle accelerations and the slip ratios of front and rear wheels; determining regression coefficient and correlation coefficient of the slip ratio of front and rear wheels on the vehicle acceleration; determining the slip ratio of front and rear wheels when the vehicle acceleration is zero; determining whether the pressures of at least 2 wheels at the same axle or 4 wheels are simultaneously reduced or not, based on the regression coefficients and the slip ratio of front and rear wheels while the vehicle acceleration is zero; and warning deflation of tires.