Oxygen sensor deterioration detection apparatus

Details Oxygen sensor deterioration detection apparatus Oxygen sensor deterioration detection apparatus

2007-11-20

2007-11-20

Olsen, Kaj K. (Department: 1753)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S424000, C073S023320

Reexamination Certificate

active

10706929

ABSTRACT:
A deterioration detection apparatus for an oxygen sensor is able to detect an abnormality of the oxygen sensor constantly with high precision, without being affected by the temperature characteristic of the element impedance. The apparatus applies a voltage V to the oxygen sensor, and calculates an element impedance real value Rsr=V/1 of a sensor element based on the applied voltage and the current I caused to flow by the voltage. The apparatus calculates an element temperature estimated value Tex of the oxygen sensor from a factor that affects the temperature of the oxygen sensor. The apparatus determines whether the oxygen sensor has an abnormality on the basis of whether the relationship between the element impedance real value Rsr and the element temperature estimated value Tex can be regarded as a relationship that agrees with a normal temperature characteristic.

REFERENCES:
patent: 6258232 (2001-07-01), Hasegawa et al.
patent: 6649041 (2003-11-01), Hashimoto et al.
patent: A 8-313466 (1996-11-01), None
patent: A 2000-193635 (2000-07-01), None

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