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Method for air-fuel ratio control of a lean burn engine

  • US 6,745,747 B2
  • Filed: 06/04/2002
  • Issued: 06/08/2004
  • Est. Priority Date: 06/04/2002
  • Status: Active Grant
First Claim
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1. A method for controlling an engine having first and second groups of combustion chambers and an engine exhaust, comprising:

  • operating the engine in a first operating mode where air and substantially no injected fuel are provided to the first combustion chamber group, and both air and injected fuel are provided to the second combustion chamber group at a lean air-fuel ratio, and injected fuel is adjusted to the second combustion chamber group; and

    operating the engine in a second mode where both air and injected fuel are provided to both the first and second combustion chamber groups, and at least one of said air and said injected fuel provided to both said first and second combustion groups is adjusted to control air-fuel ratio of the first and second groups.

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