Patent ID: 11946428
Assignee: CUMMINS EMISSION SOLUTIONS INC.
Field: Environmental technology (Chemistry)
Classification: CPC F  Y | IPC F

Claim 8:
9. An aftertreatment system configured to be coupled to an engine, the aftertreatment system comprising:
a selective catalytic reduction (SCR) catalyst;
a reductant insertion assembly configured to insert a reductant into an exhaust gas flowing through the aftertreatment system;
at least one of an electric turbo or an air pump;
a heater; and
a controller configured to:
in response to receiving an engine shutdown signal, determine an estimated amount of ammonia stored on the SCR catalyst;
in response to determining that the estimated amount of ammonia stored in the SCR catalyst is less than an ammonia storage threshold, activate (i) the electric turbo or the air pump, and (ii) a heater, such that the electric turbo or the air pump causes a flow of gas through the heater and thereby causes a flow of a heated gas towards the SCR catalyst;
cause insertion of the reductant into the exhaust gas; and
in response to determining that the estimated amount of ammonia stored in the SCR catalyst is equal to or greater than the ammonia storage threshold, cause shutdown of the engine.