Apparatus for detecting deterioration of air-fuel ratio sensor

Details Apparatus for detecting deterioration of air-fuel ratio sensor Apparatus for detecting deterioration of air-fuel ratio sensor

2007-10-23

2007-10-23

Olsen, Kaj K. (Department: 1753)

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

C205S785000, C204S401000, C204S424000, C073S023320

Reexamination Certificate

active

10633540

ABSTRACT:
In detecting a deterioration of an air-fuel ratio sensor, a sensor output change speed integrated value is calculated when an element temperature of a solid electrolyte is stabilized at a low temperature. Successively, a sensor output change speed integrated value is calculated when the solid electrolyte element is stabilized at a high temperature. Finally, a deviation between the change speed integrated values is calculated. By comparing the deviation amount with a predetermined determinant, presence or absence of the deterioration is determined.

REFERENCES:
patent: 5811661 (1998-09-01), Scheid et al.
patent: 6120663 (2000-09-01), Kato et al.
patent: 6258232 (2001-07-01), Hasegawa et al.
patent: 6935155 (2005-08-01), Yasui et al.
patent: 62-250351 (1987-10-01), None
patent: 3-87949 (1991-09-01), None
patent: 7-198672 (1995-01-01), None
Certified translation of JP 07-198672, Aug. 1995.
Japanese Office Action—Nov. 17, 2005.

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