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. 04, 2006
Filed:
Feb. 28, 2005
Takashi Nakazawa, Kawasaki, JP;
Takahisa Koseki, Novi, MI (US);
Hatsuo Nagaishi, Zushi, JP;
Takeshi Suzuki, Yokohama, JP;
Takashi Nakazawa, Kawasaki, JP;
Takahisa Koseki, Novi, MI (US);
Hatsuo Nagaishi, Zushi, JP;
Takeshi Suzuki, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An internal EGR parameter estimating device is configured to estimate the internal EGR quantity based on the quantity of blow-by gas that blows by during an overlap period when both the intake valve(s) and the exhaust valve(s) are open. The blow-by gas quantity is calculated based on the intake air pressure and the exhaust gas pressure during the overlap period and the effective cross sectional area opening formed by the intake and exhaust valves. The overlap period is divided into intervals of a prescribed period and the interval cross sectional area opening during each interval is calculated.