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:
Jun. 03, 2003
Filed:
Jun. 14, 2001
Applicant:
Inventor:
Shigeo Ohkuma, Atsugi, JP;
Assignee:
Unisia Jecs Corporation, Kanagawa-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N 3/3497 ; G01M 1/900 ;
U.S. Cl.
CPC ...
G01N 3/3497 ; G01M 1/900 ;
Abstract
The present invention is to detect a temperature of an exhaust gas purification catalyst in order to determined an air-fuel ratio feedback control start time of an internal combustion engine, wherein the temperature of the exhaust gas purification catalyst is detected by estimation and computation based on an element impedance of an air-fuel ratio sensor.