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. 24, 2012
Filed:
Dec. 20, 2007
Naoki Okamoto, Isesaki, JP;
Masahiro Arai, Yokohama, JP;
Hatsuo Nagaishi, Zushi, JP;
Yuko Nagaishi, Legal Representative, Zushi, JP;
Takahiro Yoshino, Yokosuka, JP;
Naoki Okamoto, Isesaki, JP;
Masahiro Arai, Yokohama, JP;
Hatsuo Nagaishi, Zushi, JP;
Yuko Nagaishi, legal representative, Zushi, JP;
Takahiro Yoshino, Yokosuka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a variable valve unit provided with a variable valve mechanism that varies opening characteristics of an engine valve by rotary motion of a control shaft, an actuator that generates a rotary motion of the control shaft, a stopper restricting the rotary motion of the control shaft, and an angle sensor capable of outputting signals corresponding to angle positions of the control shaft, when the signal of the angle sensor at an angle position where the rotation of the control shaft is restricted by the stopper are learned, the actuator is controlled such that the control shaft is pressed against the stopper, after which drive torque of the actuator is reduced and with the drive torque reduced, signals of the then-angle sensor are stored.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile