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:
Feb. 09, 1999
Filed:
Oct. 25, 1996
Asahiko Otani, Mito, JP;
Hitachi, Ltd., , JP;
Abstract
A control system for an internal combustion engine capable of improving purification performance of a catalytic converter provides an oscillation amplitude for an air/fuel ratio of an air/fuel mixture to be supplied to an internal combustion engine. The air/fuel ratio oscillation amplitude is variable depending upon an operating condition of the internal combustion engine and/or a purification performance of a catalytic converter. Corresponding to the air/fuel ratio oscillation, an oscillation amplitude of a spark ignition timing is provided. The spark ignition timing oscillation amplitude is variable depending upon the operating condition of the internal combustion engine and/or the air/fuel ratio oscillation amplitude.