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Hydrocarbon retaining and purging system for flex-fuel combustion engine

  • US 8,915,070 B2
  • Filed: 05/23/2013
  • Issued: 12/23/2014
  • Est. Priority Date: 11/12/2007
  • Status: Expired due to Fees
First Claim
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1. An engine method, comprising:

  • selectively routing exhaust gases through a hydrocarbon trap to store exhaust hydrocarbons;

    initiating purging stored hydrocarbons from the hydrocarbon trap, through a purge canister, and then to an engine intake responsive to an alcohol content of injected fuel; and

    varying termination of the selective routing responsive to the alcohol content of the injected fuel by delaying the termination as the alcohol content increases.

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