Supercharged internal combustion engine

A supercharged internal combustion engine comprising:

• an air intake passage means comprising in serial flow relation an air cleaner, an air flow meter, a supercharging impeller, a throttle valve and an intake manifold connected to an engine main portion,
• a fuel supply passage means comprising in serial flow relation a fuel tank and a canister including a reservoir for accommodating evaporated fuel,
• a first evaporated fuel supply passage for communicating said canister with said intake manifold downstream from said throttle valve,
• a first purge control valve means for controlling said first evaporated fuel supply passage,
• a second evaporated fuel supply passage for communicating said canister with said intake passage upstream from said supercharging impeller,
• a second purge control valve means for controlling said second evaporated fuel supply passage, wherein said second purge control valve means is opened to urge said canister in communication with said intake passage upstream from said supercharging impeller through said second evaporated fuel supply passage when the negative pressure within said intake passage has reached a predetermined value or more,
• a one-way valve provided to cooperate with said first purge control valve, wherein said first purge control valve is operated in correspondence with the negative pressure around said throttle valve, wherein said one-way valve is operated in correspondence with the negative pressure within said intake manifold downstream from said throttle valve, and
• wherein said first purge control valve is adapted to open and close one of two openings at the end portion of said first evaporated fuel supply passage while said one-way valve is adapted to open and close the other of said two openings.