EVAPORATIVE EMISSIONS CONTROL SYSTEM
A sealable fuel vapor storage and recovery system includes a sealable fuel tank and a vapor storage device. The vapor storage device includes a first end, a chamber and a second end defining a linear flow path. A vent valve is selectively controllable to one of an open position and a closed position and imposes substantially no flow restriction.
1 . A sealable fuel vapor storage and recovery system, comprising:
a fuel tank;
a vapor storage device comprising a chamber containing fuel vapor adsorbent material and having a first end including first and second openings and a second end including a third opening, the first end and the chamber and the second end defining a linear flow path therebetween;
the first opening of the vapor storage device fluidly connected to a vent opening in the fuel tank;
the second opening of the vapor storage device fluidly connected to a purge line fluidly connectable to an induction system via a purge valve;
the third opening fluidly connected to a vent valve in fluid communication with atmospheric air;
the vent valve selectively controllable to one of an open position and a closed position; and
the vent valve operative to seal the third opening of the vapor storage device when controlled in the closed position and having a cross-sectional area substantially equal to a cross-sectional area of the third opening of the vapor storage device when controlled in the open position.
2 . The system of claim 1 , further comprising the purge valve configured to seal the second opening of the vapor storage device when in a closed position.
3 . The system of claim 1 , wherein the vent opening in the fuel tank is configured to vent fuel vapor in the fuel tank during a refueling event.
4 . The system of claim 3 , wherein the induction system comprises an air induction system of an internal combustion engine.
5 . The system of claim 4 , further comprising a control module configured to control the vent valve to an open position during the refueling.
6 . The system of claim 5 , further comprising the control module configured to control the purge valve to the open position and the vent valve to the open position during operation of the internal combustion engine.
7 . Fuel vapor storage and recovery system, comprising:
a fuel tank including a filler neck having a sealable cap, the filler neck fluidly connected to an on-board refueling vapor recovery tube fluidly connected to a vapor storage device;
the vapor storage device comprising a chamber containing fuel vapor adsorbent material and having a first end including first and second openings and a second end including a third opening, the first end and the chamber and the second end defining a linear flow path therebetween;
the first opening fluidly connected to a vent opening in the fuel tank;
the second opening fluidly connected to a purge line fluidly connected to a purge valve;
the third opening fluidly connected to a first end of a vent valve selectively controllable in a closed position to fluidly seal the third opening;
a second end of the vent valve fluidly connected to atmospheric air; and
the second end of the vent valve configured to have a cross-sectional area substantially equal to a cross-sectional area of the third opening of the vapor storage device when the vent valve is controlled to an open position.
8 . The system of claim 7 , wherein the vent valve comprises a single-stage sealable valve selectively controllable to one of the open position and a closed position.
9 . Fuel vapor storage and recovery system, comprising:
a fuel tank including a filler neck having a sealable cap and a vent tube fluidly connected to a vapor storage device;
the vapor storage device including
a first end of the vapor storage device including a first opening fluidly connected to the vent tube of the fuel tank and including a second opening fluidly connected to a controllable purge valve,
a second end of the vapor storage device including a third opening fluidly connectable to atmospheric air via a controllable vent valve,
the controllable vent valve configured to fluidly seal the third opening when controlled to a closed position,
the controllable vent valve fluidly connected to atmospheric air when the vent valve is controlled to an open position,
a chamber containing a fuel vapor adsorbent material, and
the first end, the chamber, and the second end defining a linear flow path through the vapor storage device.
10 . The system of claim 9 , wherein the second opening is fluidly connected to an induction system via the controllable purge valve only when the controllable purge valve is controlled to an open position.
11 . The system of claim 10 , wherein the controllable purge valve is configured to fluidly seal the second opening when controlled to a closed position.
12 . The system of claim 11 , wherein the induction system comprises an induction system of an internal combustion engine.
13 . The system of claim 12 , further comprising a control module configured to control the vent valve to the open position during a fueling event.
14 . The system of claim 13 , wherein the vent valve comprises a single-stage high-flow sealable valve selectively controllable to one of the open position and the closed position.
15 . The system of claim 14 , further comprising the vent valve having a cross-sectional area substantially equal to a cross-sectional area of the third opening of the vapor storage device when the vent valve is controlled to the open position.
16 . The system of claim 12 , further comprising a control module configured to control the controllable purge valve to the open position and control the vent valve to the open position when operating the internal combustion engine.