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. 29, 2003
Filed:
Oct. 06, 2000
Denso Corporation, Kariya, JP;
Abstract
If conditions for measuring a storage quantity of O in a catalyst are satisfied, a target air-fuel ratio is switched to a rich value after the end of a fuel-cut state. The quantity of a rich component contained in an exhaust gas flowing into a catalyst during a period of time period is calculated. The quantity of a rich component required to consume all O absorbed by the catalyst in the fuel-cut state is calculated. The computed quantity of a rich component is taken as a storage quantity of O in the catalyst. Since the air-fuel ratio of exhaust gas is changed to a rich value, to improve exhaust gas cleaning, during the computation of a storage quantity of O , the storage quantity of O in the catalyst can be computed without worsening emission of exhaust gas.