Air flow system having constant discharge volume

Claim 1

An air flow system comprising: a supercharger having an intake side and a discharge side; a bypass passageway connected between said intake side and said discharge side of said supercharger; a mechanically driven compression machine having an intake port and a discharge port and comprising means for sucking a gas through said intake port, compressing the sucked gas and discharging the compressed gas through said discharge port; an air bypass valve in said bypass passageway and selectively closing said bypass passageway, said air bypass valve dividing said bypass passageway into a suction portion and a discharge portion, the suction portion of the bypass passageway being connected to the intake side of the supercharger and the discharge portion of the bypass passageway being connected to the discharge side of the supercharger; means for connecting the intake port of the compression machine with the bypass passageway; and an electronic controller receiving compressed gas from the discharge port of the compressing machine and comprising means for controlling the air bypass valve to open during at least high supercharging conditions so that supercharged air is delivered to the intake port of said compression machine.