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Diagnostic system for monitoring catalyst performance

  • US 20050084973A1
  • Filed: 10/07/2004
  • Published: 04/21/2005
  • Est. Priority Date: 08/10/2001
  • Status: Active Grant
First Claim
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1. A method for monitoring catalyst performance, comprising:

  • introducing an exhaust gas stream into an exhaust system that includes a plurality of treatment devices and a plurality of gas sensors disposed in fluid communication with said plurality of treatment devices, wherein said plurality of treatment devices comprises a first treatment device, a second treatment device, and a third treatment device, and said plurality of gas sensors comprise a first gas sensor disposed before said first treatment device, a second gas sensor disposed between said second treatment device and said third treatment device, and a third gas sensor disposed after said third treatment device, and further wherein at least two treatment devices comprise a nitrogen oxides adsorber material;

    monitoring said exhaust gas stream using said plurality of gas sensors;

    passing said exhaust gas stream through said plurality of treatment devices;

    measuring a first response time differential between said first gas sensor and said second gas sensor, and a second response time between said first gas sensor and said third gas sensor;

    calculating a sulfur contamination index based on said response time differentials between said plurality of gas sensors; and

    desulfating said treatment devices based upon said first response time, said second response time, and said sulfur contamination index and adjusting an air to fuel ratio to regenerate a catalyst material of one or more of said treatment devices.

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