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System and method for controlling release of fuel vapor from a vapor recovery system

  • US 6,595,190 B1
  • Filed: 07/30/2001
  • Issued: 07/22/2003
  • Est. Priority Date: 07/30/2001
  • Status: Active Grant
First Claim
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1. A method of controlling fuel vapor release from a vapor recovery system into an intake manifold of an internal combustion engine, comprising the steps:

  • determining a first purge flow ratio that is indicative of a desired amount of fuel vapor to be released from the vapor recovery system relative to an actual amount of fuel vapor released from the vapor recovery system;

    determining at least one second purge flow ratio that is indicative of a maximum desired value of an operating parameter relative to an actual value of said operating parameter; and

    adjusting the amount of fuel vapor released from the vapor recovery system based on said first purge flow ratio and said second purge flow ratio.

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