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. 10, 2013
Filed:
Mar. 23, 2012
Takahiro Nishigaki, Nagoya, JP;
Keisuke Nagakura, Toyota, JP;
Yusuke Fujitsu, Anjo, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Denso Corporation, Kariya-shi, JP;
Abstract
An abnormality determination apparatus for a multi-cylinder internal combustion engine equipped with a duel-injection system that has two fuel systems for injecting and supplying fuel to each of cylinders, which determines whether there is an abnormal variation in air-fuel ratio among the cylinders, includes: an abnormal variation determining unit that determines whether there is an abnormal variation in a period during which fuel is separately injected by both the two fuel systems; and an abnormality estimating unit that estimates which one of the fuel systems has an abnormality on the basis of a fuel injection distribution ratio of both the fuel systems in the period.