PM sensor development and simulation for diesel particulate filter on board diagnostic
Résumé
A Particulate Matter (PM) sensor based on resistive technology was developed. Sensing element consisting in inter-digital platinum electrodes and platinum heater was developed by screen-printing technology. All sensors parts, like nozzle and heater were modeled in order to ensure adequate soot collection and regeneration. Polarization applied between collecting electrodes allowed to improve sensor sensitivity. PM sensor response was characterized using various equipment’s (engine test rigs, chassis dynamometer, particulate test rig), to understand and model influence of key parameters on sensors response (gas flow, temperature, soot concentration). Evaluations performed on-board a vehicle at chassis dynamometer demonstrated the capability of such a sensor to predict DPF failure, and thus to comply with future OBD thresholds limits.