System for treating vaporized fuel in an internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorNobuaki Kayanuma
Life of this patent
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Abstract
A device for treating vaporized fuel from a fuel tank of an internal combustion engine, and having a canister. The fuel tank has an inner partition wall which divides the space inside the fuel tank into a first small chamber and a second large chamber, which are separated from each other. A fuel flow is allowed at locations below the fuel levels in the first and second chambers, which are independently connected to the canister device, and a fuel filling pipe is open to the first, small chamber. A pressure control means is provided for maintaining a pressure in the second chamber higher than that in the first chamber, which is near to the atmospheric pressure, whereby fuel vapor is prevented from escaping from the first chamber during a fuel-filling operation.
Claims9
An internal combustion engine, comprising:
- an engine body;
- a fuel tank;
- an intake system connected to the engine body and having a throttle valve therein;
- canister means for temporarily holding fuel vaporized from the fuel tank;
- means for reintroducing the fuel vapor held in the canister means into the intake system;
- partition means arranged in said fuel tank for forming therein a first small volume chamber and a second large volume chamber, respectively, said first and second chambers being separated from each other in such a manner that a communication of vaporized fuel therebetween is prevented while allowing a communication of liquid fuel between locations in the fuel tank below the fuel levels in the first and second chambers;
- said fuel tank having a fuel filling pipe and a filler cap detachably connected to the filling pipe, said filling pipe being opened to the first chamber at a position above the fuel level therein;
- first conduit means for allowing a flow of vaporized fuel between the first chamber and the canister while maintaining a positive value pressure in the first chamber near the atmospheric pressure;
- second conduit means for allowing a flow of vaporized fuel between the second chamber and the canister;
- and
- pressure control means provided in said second conduit means for obtaining a positive value pressure in the second chamber larger than that in the first chamber.
Dependencies are inferred from the claim text.