Patent ID: 8281580
Filing Date: 2012-10-09
Classification: F01N,Y02T

Abstract:
1. A method to monitor a particulate filter having an inlet, an outlet, and a substrate having porous walls disposed intermediate the inlet and the outlet, wherein a control module performs the following steps comprising: determining a mass flowrate of an exhaust gas feedstream flowing to the particulate filter; determining a mass flowrate of the exhaust gas feedstream flowing through the porous walls of the substrate subsequent to executing a regenerative operation to purge the substrate; determining an equivalent bypass area corresponding to a difference between the mass flowrate of the exhaust gas feedstream flowing to the particulate filter and the mass flowrate of the exhaust gas feedstream flowing through the porous walls of the substrate; comparing the equivalent bypass area to a threshold bypass area; and detecting a fault when the equivalent bypass area exceeds the threshold bypass area and continuing operation when no fault is detected.