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Method to reduce engine emissions for an engine capable of multi-stroke operation and having a catalyst

  • US 20050204726A1
  • Filed: 03/19/2004
  • Published: 09/22/2005
  • Est. Priority Date: 03/19/2004
  • Status: Active Grant
First Claim
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1. A method for controlling the number of cylinder strokes in at least a cylinder operating in a internal combustion engine, the method comprising:

  • operating at least a cylinder with a first number of strokes in a cycle of said cylinder, during at least a first operating condition of a catalyst; and

    operating said cylinder with a second number of strokes in a cycle of said cylinder, during a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition.

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