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:
May. 26, 2009
Filed:
Jul. 24, 2006
Hiroshi Katou, Kanagawa, JP;
Hiroshi Katou, Kanagawa, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A combustion air-fuel ratio control system controls the combustion air-fuel ratio when the warming-up of the catalyst is required and achieves an increase in the catalyst temperature at an early stage. When warming up of the catalyst is requested it determines whether or not the exhaust air-fuel ratio sensors that detect the exhaust air-fuel ratio upstream the catalyst on the exhaust passage is active, and if the exhaust air-fuel ratio sensor is inactive, it sets the combustion air-fuel ratio to the primary combustion air-fuel ratio, which is between the theoretical ratio and the combustion limit air-fuel ratio, which is richer than the theoretical ratio and allows stable combustion using open control, and if the exhaust air-fuel sensor is active, it sets the combustion air-fuel ratio to the secondary combustion air-fuel ratio, which is richer than the primary combustion air-fuel ratio and near the combustion limit air-fuel ratio using feedback control.