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:
Apr. 03, 2012
Filed:
May. 21, 2009
Shinji Nakagawa, Hitachinaka, JP;
Kazuhiko Kanetoshi, Hitachinaka, JP;
Kozo Katogi, Hitachi, JP;
Takanobu Ichihara, Naka, JP;
Minoru Ohsuga, Hitachinaka, JP;
Shinji Nakagawa, Hitachinaka, JP;
Kazuhiko Kanetoshi, Hitachinaka, JP;
Kozo Katogi, Hitachi, JP;
Takanobu Ichihara, Naka, JP;
Minoru Ohsuga, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An engine controller capable of optimizing both the air-fuel ratio and the ignition timing to provide HC-minimized performance under the relevant driving conditions (environmental conditions) in order to minimize the amount of HC emitted from an engine at the time of start-up (before catalyst activation) is provided. The engine controller includes: air-fuel ratio control means for controlling the air-fuel ratio to be within a predetermined range (for example, 14.5 to 16.5) when the engine is operated at a certain driving condition (for example, in a state in which the catalyst is not activated such as the time of starting a cooler, or idling time); and ignition timing correction means for correcting the ignition timing to the retard side when the engine is operated at the certain driving condition and the air-fuel ratio is within the predetermined range.