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. 18, 2012
Filed:
Jun. 29, 2010
Shinji Nakagawa, Mito, JP;
Kazuhiko Kanetoshi, Hitachinaka, JP;
Kouzou Katogi, Hitachi, JP;
Takanobu Ichihara, Tsuchiura, JP;
Minoru Ohsuga, Hitachinaka, JP;
Shinji Nakagawa, Mito, JP;
Kazuhiko Kanetoshi, Hitachinaka, JP;
Kouzou Katogi, Hitachi, JP;
Takanobu Ichihara, Tsuchiura, JP;
Minoru Ohsuga, Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
The present invention performs correction appropriately according to errors in the fuel system and air system respectively and corrects both variations in the air-fuel ratio and torque. When the difference between a target air-fuel ratio and a real air-fuel ratio is equal to or below a predetermined value when feedback control based on the air-fuel ratio of an exhaust manifoldA is in progress, the air-fuel ratio of a cylinder cylhaving the largest variation of angular acceleration is corrected to the rich side, for example, by increasing the amount of fuel. Angular acceleration per cylinder is then detected again and when the variation in angular acceleration among cylinders is not eliminated, it is judged that there is an error in the amount of air control of the cylinder having the largest variation and the amount of air, amount of fuel, ignition timing or the like are corrected.