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:
Jan. 11, 2005
Filed:
Mar. 11, 2003
Hajime Miura, Tokyo, JP;
Hajime Miura, Tokyo, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A variable valve timing control apparatus is provided which comprises an operation angle control mechanism capable of varying an intake operation angle, a phase control mechanism capable of varying an intake maximum lift phase, and a control unit that controls the operation angle control mechanism and the phase control mechanism in accordance with an engine operating condition, wherein the control unit has an engine temperature estimating section that estimates an engine temperature and controls the intake operation angle so that when the engine is operating in an extremely low-load range including idling, the intake operation angle when an engine temperature is extremely low is set larger than that when the engine is cold, the extremely low-engine temperature being lower than the engine temperature when the engine is cold. A method of controlling a variable valve timing of an internal combustion engine is also provided.