Physical based LNT regeneration strategy

Details Physical based LNT regeneration strategy Physical based LNT regeneration strategy

2011-08-30

2011-08-30

Denion, Thomas E (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S277000, C060S286000, C060S274000, C060S295000, C060S301000

Reexamination Certificate

active

08006480

ABSTRACT:
A lean NOXtrap is a diesel exhaust aftertreatment system is selectively denitrated in a manner that addresses unreliability of NOX sensor data. According to one concept, data from a NOXis ignored or given decreased weight in a period immediately following a denitration. According to another concept, denitration is made contingent on both a first and a second criteria being met. The first criteria relates to the amount of NOXstored in the LNT or remaining NOXstorage capacity of the LNT. The second criteria relates to the current performance of the exhaust treatment system, or a portion thereof, as determined from one or more measurements of NOXconcentration in the exhaust. This reduces premature denitrations and associated unnecessary fuel expenditures resulting from inaccurate NOXconcentration data and transient events.

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