Evaluation of an On-board, Real-time Electronic Particulate Matter Sensor Using Heavy-duty On-highway Diesel Engine Platform
California Air Resources Board (CARB) has instituted requirements for on-board diagnostics (OBD) that makes a spark-plug sized particulate matter (PM) sensor a critical component of the OBD system to detect diesel particulate filter (DPF) failure. Current PM OBD thresholds for heavy-duty on-highway vehicles is 0.03 g/hp-hr and for light-duty vehicles (2019+ Model Year LEV III) is 17.5 mg/mile. To meet these regulations, and more stringent future regulations, real-time PM sensors offer numerous benefits over traditional accumulation type resistive sensors. The focus of this work is on the experimental evaluation of such a real-time PM sensing technology manufactured by CoorsTek LLC. A 2011 model year on-highway heavy-duty diesel engine fitted with diesel oxidation catalyst/diesel particulate filter/selective catalytic reducer/ammonia oxidation catalyst (DOC/DPF/SCR/AMOX) was used for the evaluation program.