AFTERTREATMENT SYSTEM NOx AND AMMONIA CONTROL STRATEGY

A system, comprising:

• a processing circuit comprising at least one processor coupled to a memory, the memory storing instructions therein that, when executed by the at least one processor, cause the processing circuit to:
• receive a model that divides a catalyst of an aftertreatment system into a plurality of portions;
• and
• adjust the model by assigning new model values to one or more of the plurality of portions based on a gradient between one or more sensed values from one or more sensors positioned proximate to an upstream portion and one or more sensed values from one or more sensors positioned proximate to a downstream portion of the plurality of portions.