Patent ID: 6691672
Filing Date: 2004-02-17
Classification: F02B,F02D,F02F,Y02T

Abstract:
A method of control for a direct-injection internal combustion engine comprising a camshaft and at least two cylinders, each cylinder having a piston disposed therein and at least two inlet valves, each inlet valve being placed in an induction pipe shaped to give rise to an air velocity field inside the cylinder which is parallel to the longitudinal axis of the cylinder, an engine speed sensor, and a controller controlling the movement of said valves; the method comprising:(a) controlling the opening and closing of said at least two inlet valves as a function of engine speed and independent of a rotation of the camshaft; (b) causing a mean air velocity field inside the cylinder to conform to one chosen from a tumbling velocity field having a vorticity perpendicular to the axis of the cylinder and a swirling velocity field having a vorticity parallel to the longitudinal axis of the cylinder.