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Seal cleansing routine

  • US 6,374,847 B1
  • Filed: 08/30/1999
  • Issued: 04/23/2002
  • Est. Priority Date: 08/30/1999
  • Status: Expired due to Term
First Claim
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1. A method of cleansing a seal in a valve of an evaporative emission control system of an automotive vehicle immediately prior to isolating the evaporative emission control system from atmosphere by closing the valve comprising:

  • determining if a request to close said valve to isolate said evaporative emission control system from atmosphere has been made;

    cleansing said seal by cycling said valve a plurality of times to repeatedly press and lift said seal against and off of a valve seat if said request to close said valve to isolate said evaporative emission control system has been made;

    determining if said valve is closed after said cycling step such that said evaporative emission control system is isolated from atmosphere; and

    closing said valve if said valve is not closed after said cycling step to isolate said evaporative emission control system from atmosphere.

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