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. 07, 1999
Filed:
Jan. 22, 1997
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
The determining precision of catalyst activation, which is the basis for stopping a secondary air supply to accelerate catalyst activation and start air-fuel ratio feedback control, is enhanced. An engine cooling water temperature is detected, and a catalyst activation water temperature is determined from an engine startup water temperature based on predetermined characteristics. The catalyst activation water temperature is set to be lower the lower the startup cooling water temperature, and is set such that a difference between a predetermined temperature and an engine startup cooling water temperature is larger the lower the startup cooling water temperature. In this way, catalyst activation is determined with high precision according to the startup water temperature and subsequent cooling water temperature variation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile