Caterpillar Inc.

Paul R Moore

Sylvain Joseph Charbonnel

Derek A Tanis

Wilce Damion Williams

Ling Deng

Ry C Colwell

Richard Breitzman

A system for the treatment of exhaust gases from an internal combustion engine with a combustion chamber includes an upstream DEF injector disposed to introduce DEF to the combustion chamber and a close-coupled SCR catalyst downstream of and in close-coupled relation to the internal combustion engine. Downstream of the close-coupled SCR catalyst may be a primary SCR catalyst and a primary DEF injector. The system may operate to reduce NOin the close-coupled SCR catalyst during low-load conditions of the internal combustion engine and reduce NOin the primary SCR catalyst during loaded conditions.

Aftertreatment system and method

An internal combustion engine system includes a control system with a monitoring mechanism producing data of engine operating state within a BMEP/speed envelope, and an electronic control unit structured to output a control command to vary at least one of a fuel delivery property or an air delivery property in the engine based on the data. Outputting the control command switches the engine between or among combustion modes that each satisfy different calibration criteria for optimizing aftertreatment function.

Segmented calibration for aftertreatment optimization in internal combustion engine system

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Dunlap, IL, United States of America

Paul R Moore