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METHOD TO OPTIMIZE FUEL ECONOMY BY PREVENTING CYLINDER DEACTIVATION BUSYNESS

  • US 20090194064A1
  • Filed: 02/01/2008
  • Published: 08/06/2009
  • Est. Priority Date: 02/01/2008
  • Status: Active Grant
First Claim
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1. A method comprising:

  • determining a ratio of time that an engine is operating in a cylinder deactivation mode for an engine operating condition relative to a total time of engine operation in said operating condition;

    determining a number of transitions from a full cylinder mode to said cylinder deactivation mode during said operating condition;

    determining a transition modifier based on said ratio and said number; and

    modifying a transition criterion based on said transition modifier.

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