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:
Dec. 16, 1997
Filed:
Oct. 04, 1996
Applicant:
Inventors:
Toshikazu Shino, Chigasaki, JP;
Kimiyoshi Nishizawa, Yokohama, JP;
Assignee:
Nissan Motor Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02P / ;
U.S. Cl.
CPC ...
123421 ; 123422 ; 123424 ;
Abstract
A fuel supply amount to a spark ignition engine is increased and an ignition timing of an air-fuel mixture is retarded during cold startup. At the same time, it is determined whether or not the air-fuel ratio of the air-fuel mixture is richer than a predetermined level, and retardation of the ignition timing is prohibited when it is richer than this predetermined level. In this way, retardation of ignition timing is prohibited when the air-fuel ratio is very rich immediately after startup. Combustion immediately after startup is therefore stable, and the discharge amount of HC is effectively reduced.