Patent ID: 7284541

Claim:
A purge system for an internal combustion engine, comprising: a fuel tank that receives fuel; a fuel vapor passage that is communicated with the fuel tank to conduct fuel vapor, which is generated in the fuel tank; a canister that is communicated with the fuel tank through the fuel vapor passage and includes an adsorbent, which is received in an interior of a housing of the canister to adsorb the fuel vapor; an intake air passage that conducts intake air to the engine; a supercharging device that is provided in the intake air passage to supercharge the intake air; a first connection passage that communicates between the interior of the housing of the canister and a first connection point of the intake air passage, which is located on a downstream side of the supercharging device in a flow direction of the intake air in the intake air passage; a first valve that is provided in the first connection passage to open and close the first connection passage; a second connection passage that communicates between the interior of the housing of the canister and a second connection point of the intake air passage, which is located on an upstream side of the supercharging device in the flow direction of the intake air in the intake air passage; a second valve that is provided in the second connection passage to open and close the second connection passage; and a control means for controlling the first valve and the second valve, wherein the control means opens the first valve and the second valve to generate an air flow, which flows from the first connection point of the intake air passage to the second connection point of the intake air passage through the first connection passage, the interior of the housing of the canister and the second connection passage to desorb the fuel vapor from the adsorbent and to purge the desorbed fuel vapor into the intake air passage in an operational period of the supercharging device, during which the supercharging device supercharges the intake air.