Patent ID: 7694663

Claim:
A method for controlling the operation of an internal combustion engine cylinder assembly, said cylinder assembly comprising a cylinder and an associated piston, defining together a combustion chamber, the piston being mounted slidingly in the cylinder between a bottom dead center position and a top dead center position, the combustion chamber being capable of being opened or closed at the intake by an intake valve, and opened or closed at the exhaust by an exhaust valve, wherein the method comprises, during a same operating cycle: performing an exhaust opening phase; performing a first intake opening phase during a compression phase of the piston, wherein a first valve stroke during the first intake opening phase has a first amplitude; and performing a second intake opening phase subsequent to the first intake opening phase, wherein a second valve stroke during the second intake opening phase has a second amplitude substantially equal to the first amplitude; wherein the second intake opening phase starts at a crankshaft angle from 420 to 480 degrees, in an expansion phase of the piston, and in that the first intake opening phase is entirely performed during the exhaust opening phase; wherein the first intake opening phase ends between the passage of the piston at the top dead center of a first ascending and an end of the exhaust opening phase; wherein the first intake opening phase ends at substantially 360 degrees crankshaft angle; and wherein the first intake opening phase starts at about 300 degrees crankshaft angle.