Abnormality detection system of oxygen sensor and...

Details Abnormality detection system of oxygen sensor and... Abnormality detection system of oxygen sensor and...

2005-12-27

2005-12-27

Raevis, Robert (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

Reexamination Certificate

active

06978653

ABSTRACT:
In an abnormality detection system that detects abnormality in an oxygen sensor including a detection element for outputting a current value corresponding to an oxygen concentration upon receipt of a voltage application, a negative value is applied to the oxygen sensor so as to obtain an impedance of the detection element. Then a difference between the obtained impedance of the oxygen sensor upon application of the negative voltage and the impedance of the oxygen sensor upon application of a positive voltage prior to the negative voltage application is calculated. It is determined whether there is abnormality in the oxygen sensor based on the calculated difference.

REFERENCES:
patent: 6164125 (2000-12-01), Kawase et al.
patent: A 8-327586 (1996-12-01), None
patent: A 8-338823 (1996-12-01), None
patent: A 9- 274006 (1997-10-01), None
patent: A 2000-46780 (2000-02-01), None
patent: A 2001-20804 (2001-01-01), None

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