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:
Mar. 27, 2007
Filed:
Apr. 25, 2006
Applicants:
Toshiki Annoura, Nagoya, JP;
Koichi Hoshi, Susono, JP;
Inventors:
Toshiki Annoura, Nagoya, JP;
Koichi Hoshi, Susono, JP;
Assignees:
Denso Corporation, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D 41/00 (2006.01); F02D 41/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
During a learning mode period, the fuel correction coefficient is forcibly changed three times from a situation in which no correction is necessary, whereby the fuel injection quantity of each cylinder is forcibly changed three times. A cross-correlation between the estimated air-fuel ratio and the fuel correction coefficient, which are calculated based on the detected value of the air-fuel ratio sensor every 60° CA, is evaluated to learn a deviation of the air-fuel ratio detecting timing from the appropriate value.