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:
Feb. 01, 2005
Filed:
Nov. 08, 2002
Applicant:
Shigeo Ohkuma, Atsugi, JP;
Inventor:
Shigeo Ohkuma, Atsugi, JP;
Assignee:
Hitachi Unisia Automotive, Ltd., Atsugi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D 4114 ;
U.S. Cl.
CPC ...
Abstract
In a constitution for feedback controlling an air-fuel ratio using an oxygen concentration detector in which a detection signal thereof has a linearity to the air-fuel ratio within a predetermined air-fuel ratio range inclusive of a stoichiometric air-fuel ratio, when the detection signal from the oxygen concentration detector is outside a region indicating the linearity, a change in air-fuel ratio feedback control signal is limited to be smaller than that when the detection signal from the oxygen concentration detector is within the region indicating the linearity.