Motor brake device for a turbocharged internal combustion engine

Claim 1

A motor brake device for a turbocharged internal combustion engine ( 1 ), with an at least two-stage charge system ( 10 ), which includes at least one high-pressure stage ( 11 ) as well as at least one low-pressure stage ( 12 ) connected in the exhaust gas flow downstream of the high-pressure stage ( 11 ) and upstream in the charge air flow, with at least one exhaust gas line ( 20 , 20 A, 20 B, 21 , 22 ) connected with outlet channels ( 8 ) of the internal combustion engine ( 1 ) and connected downstream of the internal combustion engine ( 1 ), with at least one first closing body ( 30 ), which is provided in an area of the exhaust gas line downstream of the high-pressure stage ( 11 ) and/or the low-pressure stage ( 12 ), wherein the first closing body ( 30 ) is constructed in such a manner, that the exhaust gas flow-through and thereby the thereupon dependent pressure (P 1 ) in the at least on exhaust gas line ( 20 , 20 A, 20 B, 21 , 22 ) is so variable, that thereby the motor brake power is variably adjusted as required, wherein an exhaust gas recirculation line ( 32 , 35 ) is provided, which includes at least one exhaust gas return line ( 32 ), via which a portion of the exhaust gas is supplied from said at least one exhaust gas line ( 20 , 20 A, 20 B) upstream of a turbine ( 13 , 13 A, 13 B) of the high-pressure stage ( 11 ) to a charge air line ( 25 ) behind a compressor ( 14 ) of the high-pressure stage ( 11 ) to ensure that the exhaust gas side pressure (P 1 ) in the exhaust gas line ( 20 ) is greater than the charge air side pressure (P 2 ) in the charge air line ( 25 ) to reduce harmful emissions ( NO x , CO, CO 2 ).