Combustion engine with an exhaust gas system to which an additive can be added with a metering unit

摘要

The internal combustion engine (1) has an exhaust system (2), in which the exhaust gas of the internal combustion engine is introduced. A heat exchanger unit (4) is provided within the exhaust system. An exhaust aftertreatment (14) is inserted in a process chamber (5). The heat exchanger unit is arranged in an exhaust gas recirculation system (3) of the exhaust system, in which the exhaust gas of the internal combustion engine is introduced. A part of the exhaust gas of a combustion air supply (21) of the internal combustion engine is fed over the heat exchanger unit.