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:
May. 07, 2013
Filed:
Jul. 26, 2010
Yasuo Hirata, Chita-gun, JP;
Yasuo Hirata, Chita-gun, JP;
Denso Corporation, Kariya, JP;
Abstract
A learning value for correcting a basic injection pulse such that an actual air-fuel ratio approximates to a target air-fuel ratio is calculated individually for each injection time number, which is decided according to an operation state of an engine. Thus, even if the number of occurrence(s) of invalid injection time changes with the injection time number and the invalid injection time changes with time, the appropriate learning value can be calculated for each injection time number. If injection from an injector is performed according to an injection pulse corrected with the learning value, the change of the invalid injection time can be absorbed and accuracy of a fuel injection quantity can be improved.