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:
Apr. 29, 2003
Filed:
Aug. 15, 2001
Ikuhiro Taniguchi, Zushi, JP;
Taketoshi Kawabe, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A valve-clearance estimating apparatus estimates a valve-clearance that is a minute spacing between a valve drive element, and a valve element, which form an essential part of a moving body of an electro-magnetically operated valve. A position sensor determining an instant position of the valve drive element, a mass-change estimating portion estimate the mass of the moving body moving together with the valve drive element, and a valve-clearance estimating portion estimates the valve-clearance on the basis of a given position of the valve drive element determined by the position sensor at a time when a change in the mass of the moving body is estimated and when the valve drive element reaches proximate to one of its extreme positions.