| 摘要 |
PURPOSE:To suppress a fluctuation in rotation of an engine, by providing a control means which limits the fuel vapor, fed from a canister, to an intake air system during idle up. CONSTITUTION:A vaporized fuel feed passage 5, extended from an upper space 4a of a fuel tank 4, is connected to an opening 7, formed on the downstream side of a first throttle valve 8 of a carburetter 3, through a canister 6. A feed passage opening and closing means 16, shutting off communication of the passage 5 during cooling, and a control means 10, limiting the flow of vaporized fuel, are located to the feed passage 5. The opening and closing means 16 is formed with an opening and closing valve 17, controlled by a purge control valve 18, and a thermo valve 21. Meanwhile, the control means 10 has a control valve 28 and a solenoid valve 24, and when idle up control is made on the throttle valve 8 by means of an idle up means 9, introduction of a negative pressure to a negative pressure chamber 28b of a control valve 28 causes closing of a valve body 28c, and limitation of the feed of the vaporized fuel. |
