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. 10, 2001
Filed:
Mar. 20, 2000
Applicant:
Inventors:
Koji Wada, Tokyo, JP;
Atsuko Hashimoto, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F02D 1/302 ; F01L 1/34 ;
U.S. Cl.
CPC ...
F02D 1/302 ; F01L 1/34 ;
Abstract
A valve timing control device for use in an internal combustion engine includes a valve timing controller for variably controlling the open/close timing of intake and exhaust valves of the internal combustion engine, a drive force estimator provided in the valve timing controller for estimating a drive force of a VVT actuator on the basis of a hydraulic pressure supplied thereto, and a variable control limiter for limiting control made by the valve timing controller when the drive force of the VVT actuator, which is estimated by the drive force estimator, is equal to or less than a variable valve timing control limit boundary value.