Cummins Emission Solutions Inc.

Timothy M White

Baohua Qi

James C Clerc

Melissa Zaczek

An exemplary embodiment is a system, including an internal combustion engine fluidly coupled to an exhaust gas flowpath, an aftertreatment system disposed in the exhaust gas flowpath, where the aftertreatment system includes a NOreduction catalyst. The exemplary system includes a processing subsystem having a controller, where the controller includes modules structured to functionally execute operations for determining a catalyst degradation. The modules include a test conditions module, a testing module, a monitoring module, and a catalyst aging module. The test conditions module interprets a test conditions event occurrence for the NOreduction catalyst, the testing module commands a catalyst efficiency test in response to the test conditions event occurrence, the monitoring module interprets operating condition(s) indicative of a NOconversion efficiency during the catalyst efficiency test, and the catalyst aging module determines a catalyst aging value in response to the at least one operating condition.

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Greenwood, IN, United States of America

Timothy M White