After treatment system for a variable displacement engine

Details After treatment system for a variable displacement engine After treatment system for a variable displacement engine

1999-11-12

2000-12-26

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

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

60284, 60297, 60292, 60296, 60324, F01N 300

Patent

active

061640654

ABSTRACT:
A method (100) and system (10) for controlling the temperature of a first NO.sub.x trap in an aftertreatment system for a variable displacement engine (12). The frequency of switching between first and second cylinder banks (14, 16) of said variable displacement engine (12) controls the temperature of the NO.sub.x trap (18) in order to maintain the temperature within a preferred operating temperature range. A set of control valves (V1, V2, V3) is used to direct the flow of exhaust from alternate cylinder banks (14, 16) through various paths in order to maintain the desired temperature of the first NO.sub.x trap (18). In another embodiment (30), the aftertreatment and method (120) include a second NO.sub.x trap (26) for situations in which both engine banks (14, 16) are run simultaneously.

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