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. 11, 2003
Filed:
May. 17, 2002
Applicant:
Inventor:
Yuichi Inoue, Tajimi, JP;
Assignee:
Denso Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E01C 2/300 ; G01H 1/702 ; B60C 2/302 ;
U.S. Cl.
CPC ...
E01C 2/300 ; G01H 1/702 ; B60C 2/302 ;
Abstract
Lowpass and highpass filters, having cutoff frequencies different from each other, are used to perform first to fourth filter processing. Then, product-sums of outputs of respective filter processing are obtained. Then, frequencies corresponding to the resonance frequency are obtained based on the result of respective product-sum calculations. The thus obtained frequencies are different from each other in the degree of influence of noise components. Then, among the obtained frequencies, an optimum frequency having less influence of noise components is selected. Then, the selected frequency is smoothed to obtain a resonance frequency for a pneumatic tire pressure estimation.