Evaporative fuel treatment apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorAkinori Osanai
Life of this patent
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Abstract
A fuel tank is provided with an atmospheric air introduction hole so that the fuel tank communicates with the outside. As a result, the interior of the fuel tank is maintained at a pressure level between substantially atmospheric air pressure and positive pressure. A canister may be connected to the atmospheric air introduction hole. When an internal combustion engine starts up, the fuel tank communicates with an intake path. Internal combustion engine startup places the intake path under negative pressure. Under negative pressure, fuel vapor is supplied to the intake path from the fuel tank whose pressure level is between substantially atmospheric air pressure and positive pressure.
Claims19
An evaporative fuel treatment apparatus for an internal combustion engine, the evaporative fuel treatment apparatus comprising:
- a fuel tank for storing fuel;
- an atmospheric air inlet for causing said fuel tank to communicate with the outside and for maintaining the interior of said fuel tank at a pressure level between substantially atmospheric air pressure and positive pressure;
- a fuel injection device for injecting fuel into said fuel tank;
- and
- evaporative fuel supply means for causing said fuel tank to communicate with an intake path of an internal combustion during engine startup and for supplying evaporative fuel in said fuel tank to said intake path.
Dependencies are inferred from the claim text.