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Particulate matter sensor with engineered particle size cut-point

  • US 10,641,154 B2
  • Filed: 08/27/2015
  • Issued: 05/05/2020
  • Est. Priority Date: 08/27/2015
  • Status: Active Grant
First Claim
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1. An aftertreatment system, comprising:

  • a particulate filter configured to filter particulate matter possessing a predetermined size range included in an exhaust gas flowing through the aftertreatment system;

    a particulate matter sensor assembly positioned downstream of the particulate filter, the particulate matter sensor assembly including;

    a housing having a single inlet, a single outlet and a sidewall, the housing defining an internal volume, anda particulate matter sensor positioned within the internal volume, the particulate matter sensor having a first flat surface facing the inlet of the housing, the first flat surface being inclined at an angle in a range of 75 degrees to 105 degrees with respect to a longitudinal axis of the particulate matter sensor assembly, and having at least one of a resistance sensor, a conductance sensor, and/or a capacitance sensor disposed thereon; and

    a controller communicatively coupled to the particular matter sensor,wherein the particulate matter sensor assembly is positioned within a flow path of the exhaust gas so that a portion of the exhaust gas enters the internal volume of the housing via the single inlet, wherein the housing is configured to redirect the flow of the portion of the exhaust gas around the particulate matter sensor such that small particles included in the portion of the exhaust gas flow having a first size within or smaller than the predetermined size range are directed around the particulate matter sensor, and large particles having a second size larger than the predetermined size range impact the particulate matter sensor.

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