Patent ID: 8061126
Filing Date: 2011-11-22
Classification: B01D,F01N,Y02T

Abstract:
1. A dosing control system comprising: a selective catalytic reduction (SCR) analysis module that estimates ammonia (NH3) stored by an SCR catalyst, a maximum NH3 storage capacity of said SCR catalyst, and a nitrogen oxides (NOx) measurement for a first NOx sensor located downstream of said SCR catalyst; a dosing management module that controls dosing agent injection into an exhaust system upstream of said SCR catalyst based on said maximum NH3 storage capacity and said NH3 stored; an adjustment module that outputs an adjusted estimate of said NOx measurement based on said estimate of said NOx measurement, cross-sensitivity of said first NOx sensor, and a delay period for exhaust flow between a second NOx sensor located upstream of said SCR catalyst and said first NOx sensor; and an error module that selectively adjusts at least one of said NH3 stored and said maximum NH3 storage capacity based on a difference between said adjusted estimate and NOx measured by said first NOx sensor.