Internal combustion engine and method for controlling such an internal combustion engine

A method for controlling an internal combustion engine (1) that includes a set of combustion chambers (2) and an intake manifold (12), each combustion chamber (2) being provided with:

• a controllable intake valve (7) configured for opening and closing an intake port (8),
• a controllable exhaust valve (9) configured for opening and closing an exhaust port (10),
• a piston (5) displaceable back and forth in said combustion chamber (2) between a top dead center (TDC) and a bottom dead center (BDC), and
• a fuel injector (16),
• the intake manifold (12) connected to the intake port (8) of each combustion chamber of said set of combustion chambers (2),
• the internal combustion engine (1) being operated in a catalytic converter warm-up mode, wherein each combustion chamber (2) is driven in four-stroke operation comprising a 720 crank angle degrees cycle,
• wherein the method comprises:
• opening the intake port (8), the intake port (8) starting to open in a range 90 to 180 CAD, and closing the intake port (8), the intake port (8) becomes fully closed in a range 180 to 270 CAD;
• opening the exhaust port (10) during the power stroke, the exhaust port (10) starting to open in a range 405 to 495 CAD;
• opening the intake port (8) during the exhaust stroke, the intake port (8) starting to open in a range 610 to 690 CAD, and closing the exhaust port (10) during the exhaust stroke, the exhaust port (10) becomes fully closed in a range 630 to 710 CAD, wherein the exhaust gas is forced into the intake manifold (12) by means of the piston (5);
• mixing fuel and exhaust gas in the intake manifold (12);
• and
• closing the intake port (8), the intake port (8) becomes fully closed in a range 700 to 720+20 CAD.

A non-transitory computer-readable medium on which is stored a computer program comprising instructions for controlling an internal combustion engine (1), the internal combustion engine comprised of an intake manifold (12) and a set of combustion chambers (2), each combustion chamber (2) being provided with a controllable intake valve (7) configured for opening and closing an intake port (8), a controllable exhaust valve (9) configured for opening and closing an exhaust port (10), a piston (5) displaceable back and forth in said combustion chamber (2) between a top dead center (TDC) and a bottom dead center (BDC), and a fuel injector (16), the intake manifold (12) connected to the intake port (8) of each combustion chamber of said set of combustion chambers (2),

• the internal combustion engine (1) being operated in a catalytic converter warm-up mode, wherein each combustion chamber (2) is driven in four-stroke operation comprising a 720 crank angle degrees cycle,
• the instructions of the computer program configured to cause the internal combustion engine to:
• open the intake port (8), the intake port (8) starting to open in a range 90 to 180 CAD, and closing the intake port (8), the intake port (8) becomes fully closed in a range 180 to 270 CAD;
• open the exhaust port (10) during the power stroke, the exhaust port (10) starting to open in a range 405 to 495 CAD;
• open the intake port (8) during the exhaust stroke, the intake port (8) starting to open in a range 610 to 690 CAD, and closing the exhaust port (10) during the exhaust stroke, the exhaust port (10) becomes fully closed in a range 630 to 710 CAD, wherein the exhaust gas is forced into the intake manifold (12) by means of the piston (5);
• mix fuel and exhaust gas in the intake manifold (12);
• and
• close the intake port (8), the intake port (8) becoming fully closed in a range 700 to 720+20 CAD.