Exhaust aftertreatment system and method for an internal combustion engine
AssigneeAnalytical Engineering, Inc.
InventorsDavid F. May, Charles R. Schenk, Louis A. Krempel, H. Lee Fisher, Angela R. May
Life of this patent
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Abstract
An exhaust aftertreatment system for use with an internal combustion engine includes at least one leg having a multi-stage NOx adsorber, with each NOx adsorber stage corresponding to a different temperature range of NOx adsorption. In a multi-pass aftertreatment system, a manifold has at least one inlet and a plurality of outlets. A plurality of legs are connected with a respective manifold outlet. Each leg has a NOx adsorber therein. At least one valve is positioned in association with at least one leg for at least partially opening and closing the at least one leg.
Claims42
An exhaust aftertreatment system for use with an internal combustion engine, comprising:
- a manifold having at least one inlet and a plurality of outlets;
- a plurality of legs, each said leg connected with a respective said manifold outlet, each said leg having a NOx adsorber therein;
- and
- at least one valve, each said valve being positioned in association with at least one said leg for at least partially opening and closing said at least one leg.
A motor vehicle, comprising:
- an internal combustion engine;
- and
- an exhaust aftertreatment system in communication with said internal combustion engine, including:
- a manifold having at least one inlet and a plurality of outlets;
- a plurality of legs, each said leg connected with a respective said manifold outlet, each said leg having a NOx adsorber therein;
- and
- at least one valve, each said valve being positioned in association with at least one said leg for at least partially opening and closing said at least one leg.
A method of aftertreating exhaust from an internal combustion engine, comprising the steps of:
- providing a plurality of legs, each said leg having a NOx adsorber therein;
- positioning at least one valve in association with at least one said leg;
- and
- at least partially opening and closing said at least one valve.
An exhaust aftertreatment system for use with an internal combustion engine, comprising at least one leg, each said leg having a multi-stage NOx adsorber, each said NOx adsorber stage corresponding to a different temperature range of NOx adsorption.
A motor vehicle, comprising:
- an internal combustion engine;
- and
- an exhaust aftertreatment system in communication with said internal combustion engine, including at least one leg, each said leg having a multi-stage NOx adsorber, each said NOx adsorber stage corresponding to a different temperature range of NOx adsorption.
A method of aftertreating exhaust from an internal combustion engine, comprising the steps of:
- providing an exhaust aftertreatment system with at least one leg, each said leg having a a multi-stage NOx adsorber;
- and
- adsorbing NOx in a zone-wise manner within each said leg using said multi-stage NOx adsorber, dependent upon a temperature of the exhaust.
Dependencies are inferred from the claim text.