Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1996-12-13
1998-06-02
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60297, 60302, 123443, F01N 320
Patent
active
057584931
ABSTRACT:
A method and apparatus for desulfating a NO.sub.x trap is proposed wherein half of the engine cylinders are operated at a rich air/fuel ratio and half are operated at a lean A/F during the desulfation process. The two exhaust gas streams, the rich stream and the lean stream, are physically or chemically separated until they enter the NO.sub.x trap. A catalyzed exothermic chemical reaction is then generated in the trap. The resulting temperature increase is sufficient to remove SOX from the trap. During desulfation spark advance is adjusted to minimize event time imbalance.
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Asik Joseph R.
Meyer Garth M.
Argenbright Tony M.
Ford Global Technologies Inc.
Lippa Allan J.
May Roger L.
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