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:
Sep. 11, 2007
Filed:
Jun. 20, 2006
Satoshi Watanabe, Yokohama, JP;
Ritsuo Satou, Atsugi, JP;
Satoshi Watanabe, Yokohama, JP;
Ritsuo Satou, Atsugi, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Abstract
A variable valve mechanism () varies a lift amount and an opening/closing timing of an intake valve () of an internal combustion engine (). During a first period in an engine start operation, wall flow is suppressed by setting the lift amount of the intake valve () to be smaller so as to increase the intake air velocity. During a second period, which starts after the first period ends, the atomization of injected fuel is enhanced by increasing a valve overlap amount between the intake valve () and an exhaust valve () so as to promote blow-back of the combustion gas to an intake port (). By sequentially applying a process for increasing the intake air velocity and a process for increasing the valve overlap amount, the emission of unburned hydrocarbon during the engine start is effectively reduced.