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:
Jan. 21, 1997
Filed:
Aug. 03, 1995
Applicant:
Inventors:
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60C / ; B60C / ;
U.S. Cl.
CPC ...
731462 ; 340448 ;
Abstract
Tire vibration frequency components of left-hand and right-hand tires are derived from wheel speed signals while a vehicle is traveling. A noise frequency component is detected based on a correlation between the vibration frequency components of the left-hand and right-hand tires, and the noise frequency component is reduced relative to the vibration frequency component. Thereafter, resonance frequencies of each tire are detected using the vibration frequency component from which the noise frequency component is reduced, and tire air pressures are detected on the basis of the resonance frequencies.