Method and apparatus for detecting exhaust gas sensor defect

Details Method and apparatus for detecting exhaust gas sensor defect Method and apparatus for detecting exhaust gas sensor defect

2006-06-08

2008-10-14

Rogers, David A. (Department: 2856)

Measuring and testing

Gas analysis

Detector detail

C702S057000, C702S058000, C702S116000, C073S023310, C073S023330, C073S031060

Reexamination Certificate

active

07434450

ABSTRACT:
An air-fuel ratio sensor that outputs a sensor signal used for the feedback control of an air-fuel ratio is provided. It is determined whether an element crack is present by applying a reverse voltage to the air-fuel ratio sensor. The value of the sensor signal output from the air-fuel ratio sensor is corrected during a time period “A”. The time period “A” consists of a reverse-voltage application time period in which the reverse voltage is applied, and a return time period “T” after application of the reverse voltage ends. The return time period “T” is set based on sensor impedance correlated with the internal resistance of the air-fuel ratio sensor. The return time period “T” decreases as the sensor impedance decreases.

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