Cummins Ip, Inc.

Cummins Inc.

Ian A Package

Edmund P Hodzen

Krishna Kamasamudram

C Larry Bruner

Fan Zeng

Shankar Kumar

Mihai Chiruta

Douglas Mitchell

Jason Alan Drost

Mark N Bays

Joseph M Brault

Upendra Deshmukh

A method and system for mitigating a urea deposit within an SCR system that includes determining a mass of an accumulated urea deposit present within the SCR catalyst and SCR piping, comparing the mass of the accumulated urea deposit with a deposit upper threshold limit, and initiating an SCR regeneration event when the mass of the accumulated urea deposit is greater than the deposit upper threshold limit. The method further includes determining an amount of NHpassing through the SCR catalyst downstream of the urea deposit, comparing the amount of NHpassing through the SCR catalyst with an NHregeneration threshold limit, and terminating the SCR regeneration event when the level of NHpassing through the SCR catalyst is less than the SCR NHregeneration threshold.

Method and system for mitigating urea deposits within an SCR catalyst system

In one non-limiting embodiment, an apparatus for treating exhaust includes a reductant injector, an aftertreatment component including a NOreduction catalyst, and a pathway for directing exhaust to the aftertreatment component. The pathway includes a constriction zone within which is positioned a mixing member. The constriction zone begins downstream of the reductant injector and upstream from the aftertreatment component. However, other embodiments, forms and applications are also envisioned.

Reductant material deposit reduction in exhaust aftertreatment systems

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Columbus, IN, United States of America

Ian A Package