Gas concentration detecting apparatus

Details Gas concentration detecting apparatus Gas concentration detecting apparatus

2004-03-31

2008-11-04

Olsen, Kaj K (Department: 1795)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S406000, C204S426000, C073S023320

Reexamination Certificate

active

07445698

ABSTRACT:
In a gas concentration detecting apparatus, a voltage is applied to electrodes of a sensor element. A change is caused in either the applied voltage or an element current. An amount of a change in each of a current value and a voltage value caused is measured in response to the caused change. An amount of resistance of the sensor element is calculated based on a ratio between the change amounts in the current value and the voltage value. A detection unit detects abnormality relating to controlling the sensor by utilizing at least one of the change amounts in the current value and the voltage value.

REFERENCES:
patent: 5709198 (1998-01-01), Sagisaka et al.
patent: 6009866 (2000-01-01), Sagisaka et al.
patent: 6136169 (2000-10-01), Okamoto
patent: 6314790 (2001-11-01), Sagisaka et al.
patent: 6347544 (2002-02-01), Hada et al.
patent: 8-271475 (1996-10-01), None
patent: 2000-121600 (2000-04-01), None
Japanese Office Action mailed Aug. 28, 2007 in Japanese Appln. No. 2004-039566 with English translation.

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