Patent ID: 9605578
Date: 2017-03-28
CPC Classifications: F01N,G01N,Y02T

Claim:
1. A sensing device for detecting particulate matters in an exhaust gas processing system of an internal combustion engine, comprising: a first particulate filter piece positioned in between a first electrode and a second electrode receiving an incoming exhaust gas flow; a second particulate filter piece positioned in between a third electrode and said second electrode receiving an exhaust gas flow which passes through said first particulate filter piece; an impedance measurement circuit electrically connected to said first electrode, said second electrode and said third electrode, generating a first impedance sensing signal indicative of an impedance in between said first electrode and said second electrode and a second impedance sensing signal indicative of an impedance in between said third electrode and said second electrode; and a controller adapted to provide a PM sensing signal indicative of a particulate matters amount in said incoming exhaust gas flow in response to said first impedance sensing signal and said second impedance sensing signal.