Apparatus, system, and method for real-time diagnosis of a...

Details Apparatus, system, and method for real-time diagnosis of a... Apparatus, system, and method for real-time diagnosis of a...

2008-01-02

2011-11-29

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S276000, C060S299000, C060S301000

Reexamination Certificate

active

08065871

ABSTRACT:
An apparatus, system, and method are disclosed for real-time diagnosis of a NOx-adsorption catalyst (NAC). The method includes verifying that a NAC temperature exceeds a threshold, determining that the NAC is in a steady-state operating condition, and surveying a first oxygen sensor upstream of the NAC and a second oxygen sensor downstream of the NAC. The method further includes calculating a lambda difference between the first and second oxygen sensors, and interpreting a NAC regeneration indicator. The method further includes determining a lean-to-rich transition and a rich-to-lean transition area based on the lambda difference and the regeneration indicator. The method concludes with setting a NAC function indicator according to the lean-to-rich transition area and the rich-to-lean transition area.

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