Patent ID: 9181835
Filing Date: 2015-11-10
Classification: F01N,F02D,Y02T

Abstract:
1. A method of controlling an aftertreatment system having a SCR catalyst and communicating with an engine ECM, comprising the steps of: receiving a plurality of system values corresponding to NH3 and NOx emissions of the aftertreatment system, the system values including a measured NH3 value, a measured NOx value, an engine NOx output value, a previous urea dosing target value, and a previous engine NOx output target value; determining an optimal urea dosing target value based on the system values and one of a target NH3 storage value and an estimated NH3 storage value; determining an optimal engine NOx output target value based on the system values and a measured NOx conversion efficiency value; and injecting urea upstream of the SCR catalyst according to the optimal urea dosing target value.