Patent ID: 9366171
Filing Date: 2016-06-14
CPC Classification: F01N,Y02A,Y02T

Claim Text:
1. A method of determining an estimated amount of soot accumulated in a particulate filter of a vehicle exhaust gas system comprising: evaluating, via a controller, an instantaneous volumetric flow rate of an exhaust gas flowing through the exhaust gas system; monitoring, via a differential pressure module, an exhaust gas pressure drop across the particulate filter and returning a differential pressure output to the controller; determining, via the controller, a drive state of the vehicle based on the instantaneous volumetric flow rate of the exhaust gas and the exhaust gas pressure drop across the particulate filter, wherein the drive state is one of a steady-state drive state and a transient-state drive state; executing, via the controller, a first control action when the drive state is the steady-state drive state and executing, via the controller, a second control action when the drive state is the transient-state drive state, wherein: comparing, via the controller, the estimated amount of soot accumulated in the particulate filter to a predetermined threshold amount of soot allowable in the particulate filter; and initiating a regeneration event of the particulate filter, via the controller, when the estimated amount of soot accumulated in the particulate filter is greater than the predetermined threshold amount of soot allowable in the particulate filter, wherein the regeneration event includes heating the particulate filter to a temperature sufficient to burn collected particulate matter or soot which converts the particulate matter to carbon dioxide.