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.