Intake device for an internal combustion engine and method thereof

An intake device of an internal combustion engine, comprising:

• an intake pipe that passes an airflow therethrough into the internal combustion engine;
• a throttle valve provided within the intake pipe;
• a projection within the intake pipe located downstream of the throttle valve;
• and
• an intake valve provided between the throttle valve and the projection within the intake pipe, wherein:
• a lower portion of a valve body of the intake valve is shaped so as to correspond to an oblique cross-sectional shape of the intake pipe, and an upper portion of the valve body has notches;
• and
• a bypass is located on said valve body corresponding to a position of the projection when viewed in a flow direction of the airflow in the intake pipe,
• wherein the bypass causes the airflow passing through the intake valve to bypass the projection, and a projected area of the bypass as viewed in the flow direction of the airflow in the intake pipe is smaller than a projected area of the projection as viewed in the flow direction of the airflow in the intake pipe.

A method for controlling an airflow into an internal combustion engine having an intake device including a throttle valve provided within an intake pipe;

• a projection within the intake pipe located downstream of the throttle valve;
• and an intake valve provided between the throttle valve and the projection within the intake pipe, the method comprising:
• producing a tumble flow in a combustion chamber with the intake valve;
• and
• shaping the intake valve such that an airflow across the intake valve bypasses the projection located downstream of the intake valve, wherein the shape of the intake valve is set according to a position and shape of the projection and a distance from the projection to the intake valve.