Patent ID: 8740746
Filing Date: 2014-06-03
Classification: F02B,F02D,F16D,Y02T,Y10T

Abstract:
1. A method for controlling the power transmission in a drive train, with the drive train comprising: an internal combustion engine which drives an output shaft with an engine speed (n an exhaust gas turbine arranged in the exhaust gas stream and is in a drive connection with the output shaft or can be switched into such a one in order to transmit drive power from the exhaust gas turbine onto the output shaft; a compressor which is arranged in the fresh air stream supplied to the internal combustion engine and which is in a drive connection with the exhaust gas turbine and is driven by the exhaust gas turbine in order to charge the internal combustion engine with a predetermined charging pressure (p a power-controlled hydrodynamic coupling which is arranged in the drive connection between the exhaust gas turbine and the output shaft and via which drive power of the exhaust gas turbine is transmitted onto the output shaft, the power controlled hydrodynamic coupling including a primary wheel driven by the exhaust gas turbine and a secondary wheel driven hydrodynamically by the primary wheel and drives the output shaft, the method comprising the following steps: determining the speed (n determining a speed (n determining a variable describing the charging of the internal combustion engine by one of: detecting the variable describing the charging of the internal combustion engine and calculating the variable describing the charging of the internal combustion engine from at least one other detected variable; predetermining, depending on at least one parameter of an actual operating state or operating state to be set of the internal combustion engine and/or the exhaust gas stream, a reference variable describing the charging of the internal combustion engine and predetermining a limit speed (n controlling the power of the hydrodynamic coupling in accordance with the following steps: