초록 ▼

A system for controlling the release of fuel vapors and liquid fuel from a vehicle fuel tank is provided. The system includes: (1) a cap-controlled valve assembly which conducts fuel vapors to an on-board vapor capture device and which opens when the tank\s fuel filler cap is removed or when the pre

A system for controlling the release of fuel vapors and liquid fuel from a vehicle fuel tank is provided. The system includes: (1) a cap-controlled valve assembly which conducts fuel vapors to an on-board vapor capture device and which opens when the tank\s fuel filler cap is removed or when the pressure in the fuel tank exceeds a predetermined value and which closes when the filler cap is replaced; (2) a first, normally-closed, flapper door and a flapper-door/fuel-nozzle seal, both of which are located in the region of the the mouth of the vehicle\s filler pipe, above the level at which fuel vapors pass into the cap-controlled valve assembly; (3) a second, normally-closed, flapper door and a flapper-door seal, both of which are located below the level at which fuel vapors pass into the cap-controlled valve assembly; and (4) a vent conduit which connects the fuel tank to the filler pipe assembly at a level between the first and second flapper doors. The system prevents liquid fuel from being expelled from the vehicle\s filler pipe upon removal of the filler cap and at the same time provides reliable venting of the fuel tank during normal operation and reliable shut-off of service station fuel pumps during refueling.

대표청구항 ▼

Apparatus for controlling the release of fuel vapors from a vehicle fuel tank comprising: (a) a cap; (b) first means for carrying fuel to the fuel tank, said first means being sized to receive a fuel pump nozzle and having a mouth at one end through which the fuel pump nozzle enters the means; (c) s

Apparatus for controlling the release of fuel vapors from a vehicle fuel tank comprising: (a) a cap; (b) first means for carrying fuel to the fuel tank, said first means being sized to receive a fuel pump nozzle and having a mouth at one end through which the fuel pump nozzle enters the means; (c) second means for attaching the cap to the mouth to seal closed the mouth; (d) third means for carrying fuel vapors from the first means to a vapor capture device, said third means being connected to the first means at a level below the mouth; (e) fourth means for opening and closing the third means, said fourth means being operated by the attachment and detachment of the cap to the mouth such that attachment moves the cap into contact with the fourth means to close said means and detachment moves the cap out of contact with the fourth means to open said means, said fourth means also opening when the cap is attached and the pressure within the third means exceeds a predetermined value; (f) fifth means for carrying fuel vapors from the fuel tank to the first means, said fifth means being connected to the first means at a level below the mouth; (g) sixth means for coordinated opening and closing of the first and fifth means, said sixth means being operated by the insertion of a fuel pump nozzle into and the removal of a fuel pump nozzle from the first means such that insertion causes the first means to open and the fifth means to close and removal causes the fifth means to open and the first means to close, said closure of the first means occurring at a level below the mouth, above the level at which the third means connects to the first means, and above the level at which the fifth means connects to the first means.