Continuous Particulate Filter State of Health Monitoring Using Radio Frequency Sensing

2018-01-1260

04/03/2018

Event
WCX World Congress Experience
Authors Abstract
Content
Reliable means for on-board detection of particulate filter failures or malfunctions are needed to meet diagnostics (OBD) requirements. Detecting these failures, which result in tailpipe particulate matter (PM) emissions exceeding the OBD limit, over all operating conditions is challenging. Current approaches employ differential pressure sensors and downstream PM sensors, in combination with particulate filter and engine-out soot models. These conventional monitors typically operate over narrowly-defined time windows and do not provide a direct measure of the filter’s state of health. In contrast, radio frequency (RF) sensors, which transmit a wireless signal through the filter substrate provide a direct means for interrogating the condition of the filter itself. This study investigated the use of RF sensors for the continuous measurement of filter trapping efficiency, which was compared to downstream measurements with an AVL Microsoot Sensor, and a PM sampling probe simulating the geometry and installation configuration of a conventional PM sensor. The study included several particulate filter failure modes, both above and below the OBD threshold. The results confirmed the use of RF sensors to provide a direct and continuous measure of the particulate filter’s state of health over a range of typical in-use operating conditions, thereby significantly increasing the time window over which filter failures may be detected.
Meta TagsDetails
DOI
https://doi.org/10.4271/2018-01-1260
Pages
18
Citation
Sappok, A., Ragaller, P., Herman, A., Bromberg, L. et al., "Continuous Particulate Filter State of Health Monitoring Using Radio Frequency Sensing," SAE Technical Paper 2018-01-1260, 2018, https://doi.org/10.4271/2018-01-1260.
Additional Details
Publisher
Published
Apr 3, 2018
Product Code
2018-01-1260
Content Type
Technical Paper
Language
English