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:
Oct. 29, 2002
Filed:
Jun. 02, 2000
Applicant:
Inventors:
Yasuo Hirata, Obu, JP;
Hidehiko Asama, Toyota, JP;
Assignee:
Denso Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M 7/00 ;
U.S. Cl.
CPC ...
F02M 7/00 ;
Abstract
In an air fuel ratio control for engines, a target operation characteristic of engine speed is set based on a coolant temperature when the engine starts cranking. The target engine speed is variable with time after the engine cranking has started and converges to a speed value lower than a normal target idle speed. Immediately after a complete combustion of air-fuel mixture suplied to the engine is detected, an actual engine speed is compared with a target engine speed corresponding to the target operation characteristics, and an air-fuel ratio of the mixture supplied to the engine is controlled based on a comparison result.