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Vapor pressure control system

  • US 5,676,116 A
  • Filed: 08/29/1996
  • Issued: 10/14/1997
  • Est. Priority Date: 07/09/1996
  • Status: Expired due to Fees
First Claim
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1. A vapor pressure control system comprising:

  • a canister containing activated carbon, said canister having an inlet to which a first vapor conduit is connected and through which said canister may receive vapor, and said canister having an outlet through which said canister may release vapor;

    a joint in communication with said first vapor conduit, said joint having a first and a second inlet through which said joint may receive vapor, and said joint having an outlet that is in vapor communication with said first vapor conduit;

    a second vapor conduit in communication with said joint first inlet, and in communication with a cut valve so that vapor may travel from said cut valve to said joint, said cut valve being in communication with a fuel filler inlet in order to receive vapor therefrom;

    a fuel tank capable of containing fuel therein which would establish a fuel level within said fuel tank, and said fuel tank having a fuel inlet that is in communication with said fuel filler inlet so that fuel may be placed into said fuel tank through said fuel filler inlet;

    a fuel tank pressure sensor located to monitor vapor pressure in said fuel tank;

    a first valve located on said fuel tank, said first valve being capable of closing when said fuel tank is full;

    a second valve located on said fuel tank, said second valve being capable of allowing vapor to exit said fuel tank when said fuel level is between said first valve and said second valve, wherein said first and second valves are in communication with a control valve through a third vapor conduit; and

    an electronic control unit which utilizes a signal from said fuel tank pressure sensor to determine when to open and shut said control, wherein said control valve is in communication with said second inlet of said joint in order to permit communication of vapor from said fuel tank to said canister.

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