Abstract: In the context of an IC engine of the piston type comprising an inlet duct leading to at least one combustion chamber of the engine, at least one inlet valve which is placed between the inlet duct and each combustion chamber and determines the end of inlet of the combustion chamber, and an additional valve placed upstream from the inlet valve, the additional valve is open on opening of the inlet valve, closes shortly thereafter and opens again before the inlet valve closes.

Abstract: In order to postcharge an IC engine of the piston type during the piston motion in the vicinity of the lower dead center position in addition to the charge drawn in from an individual duct (17) via an induction valve (42) charge compressed by a charger is introduced from a pressure duct (19) via a pressure valve (28) from a charger into an inlet duct (21) leading to the inlet valve (11) of the combustion chamber, the opening phase of the pressure valve (28) and the closing phase of the induction valve (42) overlap and then a pulse exchange takes place towards the combustion chamber between the induction and pressure flows. For this purpose the connection between the induction and the pressure ducts is preferably designed in the manner of a suction jet pump pumping into the combustion chamber.

Abstract: For charging the combustion chambers (10) provided with an inlet (14) and an outlet (16) valve of an IC engine of the piston type there is a charger (20) producing a continuous pressure and pumping into a storage space (28). In a way dependent on the ignition frequency of the associated combustion chambers (10) an air control valve (34) is opened and closed which is arranged between the storage space (28) and an inlet duct (36) leading to the inlet valve (14) of these combustion chambers (10). The phase relationship of the valve (34) to the inlet valve (14) may be changed in a way dependent on the required manner of operation of the engine between a position concentrating the air supply from the storage space (28) on the start of inlet and a position concentrating the supply on the end of inlet to such combustion chambers (10), each duct (40) supplying each combustion with non-compressed charge being shut off on the side of the combustion chamber to be supplied.

Abstract: In order to postcharge an IC engine of the piston type during the piston motion in the vicinity of the lower dead center position in addition to the charge drawn in from an induction duct (17) via an induction valve (42) charge compressed by a charger is introduced from a pressure duct (19) via a pressure valve (28) from a charger into an inlet duct (21) leading to the inlet valve (11) of the combustion chamber, the opening phase of the pressure valve (28) and the closing of the induction valve (42) overlap and then a pulse exchange takes place towards the combustion chamber between the induction and pressure flows. For this purpose the connection between the induction and the pressure ducts is preferably designed in the manner of a suction jet pump pumping into the combustion chamber.