Patent ID: 9303579
Filing Date: 2016-04-05
CPC Classification: F01N,F02D,Y02T

Claim Text:
1. A method of regenerating a particulate filter of an exhaust aftertreatment device comprising: sensing a first pressure drop across the particulate filter at a first instant in time via a pressure sensor; sensing a second pressure drop across the particulate filter at a second instant in time via the pressure sensor, wherein the first instant in time and the second instant in time are from 0.5 to 60 seconds apart; calculating a rate-of-change of the pressure drop between the first instant in time and the second instant in time using a controller in communication with the pressure sensor; sensing a flow rate of an exhaust gas flowing through the exhaust aftertreatment device; determining a rate-of-change threshold from the sensed exhaust flow rate; comparing the calculated rate-of-change to the rate-of-change threshold; updating a soot model maintained by the controller using the sensed second pressure drop if the calculated rate-of-change is less than the rate-of-change threshold; and regenerating the particulate filter when an amount of soot, as determined by the soot model, exceeds a soot threshold, wherein the regenerating includes burning the soot off the particulate filter by heating the particulate filter via increasing an amount of fuel provided to an engine coupled.