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:
Dec. 05, 2006
Filed:
Apr. 21, 2005
Makoto Tanaka, Susono, JP;
Hideki Obayashi, Okazaki, JP;
Makoto Tanaka, Susono, JP;
Hideki Obayashi, Okazaki, JP;
Denso Corporation, Kariya, JP;
Abstract
An intake air base amount calculation unit respectively calculates a base air amount Gbase, an intake air temperature correction coefficient Ka and a pulsation correction coefficient Kb, and calculates an intake air base amount Gnb based on these. An internal EGR amount calculation unit calculates an clearance volume EGR amount based on an exhaust valve closing timing EVC, and further calculates a backflow EGR amount based on a valve overlap amount OL, a rotation speed of engine Ne and an intake pipe pressure Pm, and still further calculates an internal EGR amount Gegr by adding the clearance volume EGR amount and the backflow EGR amount. Then, an intake air amount calculation unit calculates an intake air amount of cylinder Gn by subtracting the internal EGR amount Gegr from the intake air base amount Gnb.