Exhaust gas sensor diagnostic

Details Exhaust gas sensor diagnostic Exhaust gas sensor diagnostic

1995-04-28

1996-09-24

Bell, Bruce F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204425, 204427, 204406, 123672, 123690, 205775, G01N 2726

Patent

active

055587526

ABSTRACT:
A diagnostic apparatus applied to internal combustion engine exhaust gas sensors employing electrochemical polarographic principles indicates sensor operation relative to a current limiting operating region in which a sensor output signal indicates oxygen concentration in the exhaust gas. A sensor drive signal is controllably perturbed and sensor sensitivity monitored by monitoring the sensor response to the perturbation. Current limiting operation may be diagnosed and indicated when the sensor response indicates an insensitivity to the perturbation.

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