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Systems and methods for engine control

  • US 10,030,617 B2
  • Filed: 04/18/2016
  • Issued: 07/24/2018
  • Est. Priority Date: 05/23/2011
  • Status: Active Grant
First Claim
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1. A method for controlling exhaust gas recirculation (EGR) rate in an internal combustion engine, comprising:

  • with a controller, routing at least a portion of exhaust from a first exhaust manifold to an air intake manifold coupled to the engine, and not to atmosphere, the first exhaust manifold exclusively coupled to a first cylinder group;

    with the controller, routing exhaust from at least one additional exhaust manifold coupled to a corresponding at least one additional cylinder group to atmosphere; and

    with the controller, during a first engine operating condition where an engine fuel demand is below a threshold demand, not injecting fuel to each of a subset of cylinders in the first cylinder group while injecting fuel to a subset of all cylinders coupled to the at least one additional exhaust manifold, where a number of cylinders of the subset of cylinders in the first cylinder group decreases in response to an increase in a target EGR rate.

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