Exhaust system for an internal combustion engine

An exhaust system (6) for an internal combustion engine (4);

• the exhaust system (6) comprises:
• an end chamber (9) having a first inlet opening (19) and a second inlet opening (26), which are separate from and independent of one another, and an outlet opening (10), through which exhaust gases are released into the atmosphere;
• an exhaust duct (7), which originates from the internal combustion engine (4) and leads to the first inlet opening (19) of the end chamber (9);
• a silencer device (11), which has an outlet opening (17), which directly leads to the second inlet opening (26) of the end chamber (9);
• a bypass duct (12), which originates from the exhaust duct (7) in the area of a bifurcation (13) and ends in an inlet opening (16) of the silencer device (11);
• and
• an adjustment valve (14), which can be electronically controlled, is arranged along the exhaust duct (7) downstream of the bifurcation (13) where the bypass duct (12) originates and is designed to adjust the exhaust gas flow towards the first inlet opening (19) of the end chamber (9);
• wherein the end chamber (9) has at least one movable partition (23), which can be moved to different positions so as to change the width and/or the shape of the outlet opening (10);
• wherein it is provided a motor-driven actuator device (24), which is configured to actively move the movable partition (23) and can be electronically controlled;
• wherein it is provided a control unit (27), which is configured to change, by controlling the actuator device (24), the position of the movable partition (23) and to change a position of the adjustment valve (14);
• wherein the two movable partitions (23) are hinged so as to rotate around two respective rotation axes (25) parallel to one another;
• wherein the end chamber (9) has two fixed side walls (19), which are opposite and parallel to one another as well as perpendicular to the rotation axes (25);
• wherein the two movable partitions (23) are enclosed between the fixed side walls (19) and slide against the fixed side walls (19) when they move;
• and
• wherein the end chamber (9) has two fixed base walls (20, 21), which are opposite one another and diverging as well as parallel to the rotation axes (25) and against which at least part of the movable partition (23) rests when it is in a maximum expansion position.