Patent ID: 8087243

Claim:
An internal combustion piston engine of the type comprising at least one cylinder equipped with an exhaust valve ( 3 ) associated with the turbine ( 7 ) of a turbocharger intended to recover some of the residual energy contained in the combustion gases, by means of an additional expansion thereof in said turbine of the turbocharger so as to drive the compressor of this same turbocharger and thus turbocharge said internal combustion engine, in which the turbine ( 7 ) of each cylinder ( 1 ) that releases said combustion gases is mounted directly on the cylinder head ( 10 ) downstream of the exhaust valve ( 3 ) and without the intermediary of a manifold ( 12 ) located between the cylinder head ( 10 ) and the inlet of this turbine ( 7 ), characterized in that at least one additional exhaust valve ( 4 ) or dynamic discharge valve is provided in the cylinder head ( 10 ) of the cylinder ( 1 ) and configured so that the gases that escape through this dynamic discharge valve are sent directly to an exhaust system ( 11 ) without first passing through the turbine ( 7 ) of said turbocharger and so that the opening of said dynamic discharge valve is controlled so as to open during each exhaust cycle performed in said cylinder at the earliest substantially after the exhaust valve ( 3 ) opens and so as to close at the latest when the piston ( 2 ) of said cylinder has just passed its top dead point after having completed its exhaust stroke.