Patent ID: 7284375
Filing Date: 2007-10-23
Classification: F02B,F02D,Y02T

Abstract:
1. A method for closed-loop control of at least a first exhaust gas turbocharger with variable turbine geometry, comprising the steps of: automatically controlling charge air pressure by means of a first closed-loop control system, which has a charge air pressure controller that determines a first correcting variable (SG 1 ) for influencing a flow-through turbine cross section from a deviation (dpLL) of an actual charge air pressure value from a set charge air pressure value; and automatically controlling turbine speed by means of a second closed-loop control system, which has a turbine speed controller that determines a second correcting variable (SG 2 ) for influencing the flow-through turbine cross section (AT) from a deviation (dnT) of an actual turbine speed value from a set turbine value, the second closed-loop control system being subordinate to the first closed-loop control system, and a reference input of the second closed-loop control system being determined from the first correcting variable (SG 1 ), including computing a third correcting variable (SG 3 ) for synchronizing the first exhaust gas turbocharger and a second exhaust gas turbocharger with variable turbine geometry from a difference (DIFF) of turbine speeds (nT 1 , nT 2 ), by means of a first synchronization controller.