Method and system for exhaust particulate matter sensing
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United States of America Patent
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Apr 24, 2018
Issued Date -
May 11, 2017
app pub date -
Nov 10, 2015
filing date -
Nov 10, 2015
priority date (Note) -
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Abstract
Methods and systems are provided for sensing particulate matter by a particulate matter sensor positioned downstream of a diesel particulate filter in an exhaust system. In one example, a method may include accumulating incoming particulate matter by applying a higher bias to a first trap of the particulate matter sensor, and further charging the particulate matter and forming highly charged dendrites. The method further includes capturing the dendrites exiting the first trap by applying a lower bias to a second trap also housed within the same particulate matter sensor, thereby reducing the effects of exhaust flow rate on the particulate matter sensor and further increasing the sensitivity of the particulate matter sensor.
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