Patent ID: 9051866
Filing Date: 2015-06-09
Classification: F01N,F02B,Y02T

Abstract:
1. Method for monitoring a particulate filter configured to treat exhaust gas from an internal combustion engine, comprising: employing a soot sensor to monitor the exhaust gas downstream of the particulate filter, comprising, by a particulate filter diagnostic, monitoring a soot signal output from the soot sensor beginning at the completion of a first regeneration event, iteratively determining a soot mass based upon the soot signal, and integrating the iteratively determined soot masses to determine an accumulated soot mass since the completion of the first regeneration event; detecting a fault in the particulate filter, by the particulate filter diagnostic, when the accumulated soot mass exceeds a soot mass threshold over a course of engine operation between the first regeneration event and a second regeneration event of the particulate filter; notifying a control module associated with operation of the internal combustion engine of the fault; and executing remedial action in response to the fault, including operating the particulate filter and soot sensor in a regeneration mode.