Method and apparatus for regulating the boost pressure of an internal combustion engine

Method for regulating the boost pressure of an internal combustion engine (1) with a multi-flow air system comprising a multi-channel air supply and a corresponding multi-channel exhaust gas discharge, each with an exhaust gas turbocharger (5, 10), characterized in that in dependence on the (in the respective exhaust duct 15, 20 ) prevailing Istabgasgegendruck each case a manipulated variable for converting an adjusted target supercharging pressure is determined, where (from the deviation between the target supercharging pressure and an actual boost pressure from a first controller 25), an entire desired exhaust back pressure is determined, and wherein out of the total desired exhaust back pressure as a function of a difference in via the air ducts (30, 35) of the internal combustion engine (1) supplied air mass flows, respectively, a desired exhaust back pressure for the individual exhaust gas passages (15, 20) is determined, and that the respective control variable for the adjusted target boost pressure by a respective further controller (40, 45) from a deviations g is determined between the desired exhaust back pressure and the Istabgasgegendruck of exhaust channel (15, 20).