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. 19, 2006
Filed:
Jul. 12, 2004
Hiroyuki Itoyama, Yokohama, JP;
Hiroyuki Itoyama, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An engine control system is configured to improve the estimation accuracy of a fresh intake air quantity and a total intake air quantity that flows into the combustion chambers. The engine control system is configured to estimate an estimated EGR rate value Regr using a primary lag process for a target EGR rate, calculate a volumetric efficiency equivalency value based on the estimated EGR rate value Regr, estimate an estimated fresh intake air value Qac that flows into the combustion chamber based on a rate of change in a volumetric efficiency equivalency value Kin/Kinof the estimated EGR rate value Regr and the volumetric efficiency equivalency value Kin, and estimate an estimated total intake air quantity value Qscothat includes the EGR gas based on the estimated fresh intake air value Qac and the estimated EGR rate value Regr.