FUEL EFFICIENT AMMONIA GENERATION STRATEGY FOR LEAN-BURN ENGINES UTILIZING PASSIVE NH3-SCR FOR THE CONTROL OF NOX

摘要

A method and system for operating an ammonia generation cycle in an internal combustion engine and a connected aftertreatment system includes monitoring a parameter of engine operation, comparing the parameter of engine operation to a threshold delineating operation of the engine in one of a stoichiometric operation and rich operation, and operating the ammonia generation cycle based upon the comparing indicating the parameter of engine operation exceeding the threshold.