Exhaust gas aftertreatment systems

Details Exhaust gas aftertreatment systems Exhaust gas aftertreatment systems

2005-09-01

2008-09-02

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, C060S277000, C060S286000, C060S295000

Reexamination Certificate

active

07418816

ABSTRACT:
A method is presented for determining an amount of reductant stored in the catalyst by intrusively desorbing a portion of reductant and monitoring the response of a reductant sensor to the desorbed portion. The desorbtion can be performed at vehicle start-up to determine initial storage amount and to adjust reductant injection accordingly to achieve optimum storage. Additionally, a portion of reductant can be desorbed when NOx conversion efficiency of the catalyst is reduced in order to diagnose the component responsible for system degradation.

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