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Method for exhaust gas recirculation rate control

  • US 9,316,165 B2
  • Filed: 05/23/2011
  • Issued: 04/19/2016
  • Est. Priority Date: 05/23/2011
  • Status: Active Grant
First Claim
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1. A method for controlling EGR rate in an internal combustion engine, comprising:

  • routing exhaust from a first cylinder group exclusively to an intake coupled to the engine, and not to atmosphere;

    routing exhaust from a second cylinder group to atmosphere; and

    during a first engine operating condition where an engine fuel demand is below a threshold demand, injecting fuel to each cylinder in the first cylinder group while injecting fuel to a subset of cylinders of the second cylinder group, where a number of cylinders of the subset of cylinders of the second cylinder group decreases in response to an increase in a target EGR rate.

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