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. 26, 2006
Filed:
Aug. 29, 2005
Masamichi Yamada, Hitachinaka, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Shiro Yamaoka, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Katsuaki Fukatsu, Naka, JP;
Masamichi Yamada, Hitachinaka, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Shiro Yamaoka, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Katsuaki Fukatsu, Naka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An exhaust recirculation control system of the internal combustion engine computes an oxygen concentration in total intake air containing recirculation exhaust gas in a cylinder and the ratio between an oxygen quantity in the total intake air and a fuel injection quantity (oxygen quantity/fuel injection quantity ratio). The computed values are compared with target values which are pre-set according to engine operating conditions and, based on the result of the comparison, at least an EGR valve or a fuel injection quantity. In order to perform such a control with high accuracy, a correcting means corrects a recirculation exhaust gas mass flow signal from a gas mass flowmeter on the basis of a predicted exhaust gas component concentration. And, by using the corrected recirculation exhaust gas mass flow, oxygen concentration in total intake air containing the recirculation exhaust gas in the cylinder and the ratio between the oxygen quantity in the total intake air and the fuel injection quantity (target oxygen quantity/fuel injection quantity ratio) are computed to perform EGR control.