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Lean engine control with multiple catalysts

  • US 6,550,240 B2
  • Filed: 09/14/2001
  • Issued: 04/22/2003
  • Est. Priority Date: 09/14/2001
  • Status: Expired due to Term
First Claim
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1. A method for controlling an engine having a first and second group of cylinders, the first group coupled to a first catalyst and the second group coupled to a second catalyst, comprising:

  • concurrently operating the first and second cylinder groups rich of stoichiometry;

    in response to a first indication that said rich operation of at least one of the first and second catalysts should be ended, operating the group coupled to the at least one catalyst near stoichiometry while continuing operation of the other group rich of stoichiometry; and

    in response to a second indication that said rich operation of the other catalyst should be ended, ending rich operation of the other group.

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