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Method to improve fuel economy in lean burn engines with variable-displacement-like characteristics

  • US 20030221655A1
  • Filed: 06/04/2002
  • Published: 12/04/2003
  • Est. Priority Date: 06/04/2002
  • Status: Active Grant
First Claim
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1. A method for operating an engine having multiple combustion chambers, comprising:

  • determining a desired engine output;

    when said desired engine output is greater than a preselected amount, operating the engine in a first mode with all the combustion chambers combusting a mixture of air and fuel; and

    when said desired engine output is less than a predetermined amount, transitioning to a second mode with a first number of the combustion chambers inducting air with substantially no fuel injected, and a second number of the combustion chambers combusting a lean mixture of air and fuel at an output per chamber greater than output per chamber when operating in said first mode before said transition, and engine output is less than when operating in said first mode before said transition.

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