Method for regulating the temperature of the gas system of a combustion engine

The method involves expanding exhaust gas in a turbine (2) of a turbocharger (21). The gas is mixed with fresh air to form a mixture in an air duct (22). The mixture is compressed to charge air in a compressor (3) of the turbocharger. The mixture is guided through a suction pipe (20) into a combustion chamber (11) of an internal combustion engine (1). A regulation process for a charge air temperature, another regulation process for an exhaust gas recirculation rate and a third regulation process for a recirculated exhaust gas temperature are executed based on an operating mode of the engine.