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Engine starting control for engine with hydrocarbon retaining system

  • US 8,448,422 B2
  • Filed: 06/26/2008
  • Issued: 05/28/2013
  • Est. Priority Date: 11/12/2007
  • Status: Expired due to Fees
First Claim
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1. A method of operating an engine, comprising:

  • during engine starting, flowing exhaust gas through a first hydrocarbon trap, storing engine exhaust hydrocarbons in the first hydrocarbon trap, flowing the exhaust gas through a second hydrocarbon trap, and storing engine exhaust hydrocarbons in the second hydrocarbon trap; and

    selectively purging stored hydrocarbons from the first and second hydrocarbon traps in parallel to an engine air intake.

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