Method and system for diesel particulate filter diagnostics

摘要

Methods and systems are provided for determining degradation of a particulate filter in an exhaust conduit. In one example, a method may include diverting exhaust gas to a secondary soot sensor assembly downstream of a first filter, comprising a filter and determining degradation based on time intervals between subsequent filter regenerations of the second filter in the secondary soot sensor assembly.

主权项

1. A method, comprising:
diverting exhaust gas from downstream of a first filter into each of parallel first and second pathways, the second pathway including a second filter coupled to an electric circuit; and indicating degradation of the first filter based on an interval between successive regenerations of the second filter; wherein the indicating includes indicating degradation responsive to the interval between successive regenerations of the second filter being lower than a threshold duration.