Air suction device

An air suction device comprising:

• an air suction system which defines an air suction passage of an internal combustion engine;
• at least one capacity-enlarged portion which is positioned at midway of the air suction passage and has an enlarged capacity;
• at least one compression pump which compresses air in synchronization with operation of the engine;
• a compression air control unit which controls at least one of a phase and a amplitude of a pressure variation of compression air discharged from the compression pump so as to provide compression air with the pressure variation having the phase opposite to that of a pressure variation of suction air sucked into the engine;
• and
• a vibration plate which is vibration-excited by compression air from the compression pump and disposed in a connection passage of the air suction passage, the connection passage connecting a discharge side of the compression pump with the capacity-enlarged portion.