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Method and system for rapid heating of an emission control device

  • US 7,168,239 B2
  • Filed: 06/04/2002
  • Issued: 01/30/2007
  • Est. Priority Date: 06/04/2002
  • Status: Active Grant
First Claim
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1. A method for controlling an engine having at least first and second groups of cylinders, the engine coupled to an emission control device, comprising:

  • in response to engine starting, and during emission control device warm-up;

    operating the first group of cylinders at a first ignition timing; and

    operating the second group of cylinders at a second ignition timing more retarded than said first group, wherein said operation of the first and second groups of cylinders is further in response to an indication that the engine is operating in idle speed control, and the first group of cylinders is operated at a higher load than if both cylinder groups were operated at substantially the same ignition timing.

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