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Soot load estimation during idle or low load

  • US 10,273,858 B2
  • Filed: 12/02/2015
  • Issued: 04/30/2019
  • Est. Priority Date: 12/02/2015
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an engine;

    an aftertreatment system including a particulate filter; and

    a controller configured to;

    receive engine operating conditions for the engine;

    compare the engine operating conditions to one or more engine operating threshold values;

    compare a time value since a last delta pressure soot load estimate process to a predetermined time threshold;

    decrease a flow threshold value to a lower flow threshold value responsive to the time value being greater than or equal to the predetermined time threshold;

    compare a flow amount to the lower flow threshold value;

    activate a delta pressure soot load estimation process and calculate a combined soot load estimate using a delta pressure soot load estimation of the delta pressure soot load estimate process, responsive to determining the flow amount is greater than or equal to the lower flow threshold value.

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