MULTI-LEG EXHAUST AFTER-TREATMENT SYSTEM AND METHOD

摘要

An exhaust flow detection and variable dosing system for treating exhaust flow from an engine and associated method is provided that maintains minimal variability in the NOx emissions exiting the exhaust system thereby maintaining desirable emissions conversion efficiency for emissions compliance and minimizing associated fuel economy penalties, while minimizing the release of un-reacted reductant into the atmosphere. The system includes first and second exhaust flow legs, a cross passage connecting the first and the second exhaust low legs upstream of a selective catalytic reducers, and a sensor positioned along the cross passage to detect at least one of differential pressure between the first and the second exhaust flow legs, and exhaust flow in the cross passage.