Method and apparatus for desulfating a no.sub.x trap

Details Method and apparatus for desulfating a no.sub.x trap Method and apparatus for desulfating a no.sub.x trap

1997-08-29

1999-11-02

Look, Edward K.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60285, 60276, F01N 300

Patent

active

059747889

ABSTRACT:
A method and apparatus for desulfating a NO.sub.x trap is proposed wherein the SO.sub.x purge temperature is achieved by modulating the amplitude of the A/F of the mixture supplied to the engine thereby storing oxygen in the trap during lean engine cylinder events and generating the required exotherm during rich engine cylinder events.

REFERENCES:
patent: 5746049 (1998-05-01), Cullen et al.
patent: 5758493 (1998-06-01), Asik et al.
patent: 5771685 (1998-06-01), Hepburn
patent: 5832722 (1998-11-01), Cullen et al.

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