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Engine control system and method with lean catalyst and particulate filter

  • US 6,237,326 B1
  • Filed: 08/24/1999
  • Issued: 05/29/2001
  • Est. Priority Date: 08/24/1999
  • Status: Expired due to Term
First Claim
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1. A method for managing regeneration of a particulate filter communicating with an engine exhaust upstream of a catalyst, the method comprising:

  • estimating an amount of stored particulates in the particulate filter;

    regenerating the particulate filter dependent upon said amount and a condition of the catalyst, adding a first reductant amount to the exhaust when regenerating the particulate filter; and

    adding a second reductant amount to the exhaust otherwise, wherein said first reductant amount is based on a quantity of released reductant from regeneration of the particulate filter.

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