JP2001138756A5 - - Google Patents

Description

Further, during operation of the engine E, an electronic control unit that receives signals from the pressure sensor 56 and the fuel temperature sensor 57 so that the internal pressure of the tank body 11 is maintained below the atmospheric pressure even if the temperature of the fuel tank T rises. U opens the fourth solenoid valve 55 by duty control. This allows the tank main body 11 is connected to an intake passage 40 of an engine E via a positive pressure preventing passage 54, to retain the internal pressure of the tank body 11 below the atmospheric pressure in the negative pressure of the intake passage 40. Further, when the vehicle falls, the float valve 53 is closed to prevent the fuel in the tank body 11 from flowing out to the intake passage 40 through the positive pressure prevention passage 54.

When purging the evaporated fuel adsorbed on the canister 38, the second solenoid valve 45 provided in the atmospheric communication passage 41 and the third solenoid valve 47 provided in the purge passage 39 are ordered by a command from the electronic control unit U. Open the valve. As a result, the air is sucked into the intake passage 40 through the filter 42, the second solenoid valve 45, the canister 38, and the third solenoid valve 47 under the negative pressure of the intake passage 40 of the engine E, and is attracted to the canister 38 at that time. The evaporated fuel that has been used is purged and supplied to the intake passage 40.