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Oxygen sensor monitoring arrangement

  • US 20040159148A1
  • Filed: 02/18/2003
  • Published: 08/19/2004
  • Est. Priority Date: 02/18/2003
  • Status: Active Grant
First Claim
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1. A method for detecting proper functioning of an oxygen sensor mounted in an engine exhaust stream of a vehicle and in communication with an engine controller, the method comprising the steps of:

  • initiating the method at the engine controller 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;

    determining at least one mathematical characteristic from a sequence of readings of an output of the sensor over a predetermined time interval;

    comparing the at least one characteristic to a corresponding standard; and

    determining proper functioning of the sensor whenever the at least one characteristic compares favorably to its corresponding standard.

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