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Method for controlling the temperature of an emission control device

  • US 7,111,450 B2
  • Filed: 06/04/2002
  • Issued: 09/26/2006
  • Est. Priority Date: 06/04/2002
  • Status: Active Grant
First Claim
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1. A method for operating an engine having a first and second group of cylinders, wherein said engine further comprises a throttle, comprising:

  • operating in a first mode wherein the first cylinder group operates with air and substantially no injected fuel and the second cylinder group operates by combusting air and injected fuel at a lean air-fuel ratio, and during said first mode, said air for said first and second group of cylinders gasses through said throttle;

    providing an indication of the device temperature; and

    in response to said indication, disabling said first mode of operation and operating the engine in a second mode of operation.

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