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:
Jul. 28, 1998
Filed:
Jul. 01, 1996
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An air-fuel ratio control apparatus for an internal combustion engine is provided which includes an air-fuel ratio determining circuit which determines an air-fuel ratio of exhaust gases flowing upstream of a catalytic converter for controlling the air-fuel ratio of the exhaust gases so as to agree with a target air-fuel ratio under feedback control, a sorbed substance amount determining circuit for determining the amount of substances sorbed in the catalytic converter, and a target air-fuel ratio determining circuit for determining said target air-fuel ratio so that the amount of substances determined by said sorbed substance amount determining means falls within a given range. The sorbed substance amount determining circuit determines the amount of substances sorbed in the catalytic converter based on the air-fuel ratio determined by said air-fuel ratio determining circuit using a catalytic converter model established using parameters indicating adsorption reaction of exhaust gas components entering the catalytic converter, oxidation-reducing reaction of the substances sorbed in the catalytic converter with the exhaust gas components, desorption reaction of the substances sorbed in the catalytic converter, and a non-reacted portion of the exhaust gas components.