Patent ID: 7418945

Claim:
A fresh gas system for a piston engine ( 1 ), in particular in a motor vehicle, having at least one collecting line ( 10 ) to supply fresh gas to multiple individual lines ( 11 ), whereby each individual line ( 11 ) supplies fresh gas to one combustion chamber ( 6 ) and the piston engine ( 1 ), whereby each cylinder ( 5 ) of the piston engine ( 1 ) has at least one intake valve ( 7 ) for opening and closing a connection between the respective combustion chamber ( 6 ) and the respective individual line ( 11 ), whereby in each individual line ( 11 ) an additional valve ( 13 ) for opening and closing the individual line ( 11 ) is arranged upstream from the at least one intake valve ( 7 ), wherein the at least one collecting line ( 10 ) is unthrottled, a control unit ( 14 ) for actuation of the additional valves ( 13 ) is designed so that it subdivides a fresh gas charge of the respective combustion chamber ( 6 ), depending on the prevailing load state of the piston engine ( 1 ) in the case of partial-load operation of the piston engine ( 1 ) and does so within an intake time window (T) that is defined by the opening and closing of the respective intake valve ( 7 ), thereby subdividing it into two charging phases (A, B); activating the respective additional valve ( 13 ) at a closing point in time (T S ), which depends on the prevailing load state of the piston engine ( 1 ), to close within the intake time window (T) and at a later opening point in time (T O ), which depends on the prevailing load state of the piston ( 1 ), activating the valve to open.