Oxygen sensor monitoring arrangement

Measuring and testing – Internal combustion engine or related engine system or... – Compression

Reexamination Certificate

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C073S116070, C073S049700

Reexamination Certificate

active

06860144

ABSTRACT:
A non-intrusive method and arrangement for detecting the aging of an oxygen sensor, without increasing tailpipe emissions, is provided. The method detects an aging oxygen sensor, located between a motor vehicle engine and a catalytic converter, by sampling a series of oxygen level signals taken over a calibratable time block only when at least one engine operating condition satisfies a predetermined criterion whereunder the method will not intrude upon the engine controller's ability to minimize undesirable exhaust emissions. After a series of signal processing, the samplings are then compared to calibratable thresholds in order to determine the aging degree of the oxygen sensor.

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