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:
Sep. 30, 1997
Filed:
May. 24, 1996
Applicant:
Inventor:
Keiichiro Aoki, Susono, JP;
Assignee:
Toyota Jidosha Kaisha, Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ;
U.S. Cl.
CPC ...
123688 ; 123697 ;
Abstract
An apparatus to determine whether or not an air-fuel ratio sensor is fully activated is provided. In the apparatus according to the present invention, first, the point of the start of the fluctuation of the output voltage of the air-fuel ratio sensor is detected, and thereafter the fully activated state of the air-fuel ratio sensor is determined by detecting the point when the accumulated value of the difference between the present heater resistance and the standard heater resistance after the above point of the start of the fluctuation of the output voltage of the air-fuel ratio sensor, exceeds a predetermined threshold.