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Hybrid drivetrain having active torsional vibration damping, and method for carrying out the active torsional damping

  • US 9,933,039 B2
  • Filed: 12/27/2013
  • Issued: 04/03/2018
  • Est. Priority Date: 06/28/2011
  • Status: Active Grant
First Claim
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1. A method for carrying out an active torsional vibration damping in a drivetrain having a combustion engine subject to torsional vibrations, the drivetrain comprising a torsional vibration damper that is operationally connected to a crankshaft of the combustion engine, a primary inertial mass arranged on the crankshaft, an electric machine operationally coupled to a transmission input shaft of a transmission, the electric machine having a rotor forming a secondary inertial mass assigned to the transmission input shaft, a spring device coupling the primary inertial mass and the secondary inertial mass to be relatively and limitedly rotatable with respect to each other, and a control unit for regulating an output torque of the electric machine to a compensation torque that compensates for a disturbance torque subject to torsional vibration which occurs at at least one operating point, the method comprising the steps of:

  • receiving data from at least one sensor;

    determining a differential angle of rotation between the primary inertial mass and the secondary inertial mass based on the data;

    calculating the disturbance torque of the drivetrain based on predetermined parameters and the differential angle of rotation;

    determining the compensation torque based on the disturbance torque;

    imprinting the compensation torque onto a memory to be used by the electric machine; and

    ,using the rotor of the electric machine to implement the compensation torque to the drivetrain.

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