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. 19, 2010
Filed:
Apr. 15, 2009
Yasuhiro Kajiwara, Kariya, JP;
Minoru Wada, Obu, JP;
Yasuhiro Kajiwara, Kariya, JP;
Minoru Wada, Obu, JP;
Denso Corporation, Kariya, JP;
Abstract
A valve timing control apparatus for a valve timing adjustment mechanism that adjusts timing of opening and closing an intake or exhaust valve of an engine includes an output-side rotor, a cam-side rotor, a hydraulic pump, a control device, a control valve, a storage device. The control device outputs a signal associated with rotation of one of the rotors relative to the other one. The control valve controls the speed of the rotation. The storage device prestores standard data indicating a predetermined relation between a dead zone width and a parameter correlated with the dead zone width for each hydraulic oil temperature. A value of the parameter of the adjustment mechanism during a hold state is learned by changing the signal. The control device computes the signal based on the value learned, the standard data, and hydraulic oil temperature.