Hybrid drivetrain having active torsional vibration damping, and method for carrying out the active torsional damping
First Claim
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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Accused Products
Abstract
A drivetrain having an active torsional vibration damping and a method for carrying out the active torsional vibration damping, having an internal combustion engine being affected by torsional vibrations and having a crankshaft, a torsional vibration damper that is operatively connected to the crankshaft and has at least one operating point of low vibration isolation of the torsional vibrations and has a primary inertial mass associated with the crankshaft and an inertial mass associated with a gear input shaft of a gearbox, the inertial mass being rotatable relatively and limitedly with respect to the primary inertial mass against the action of a spring device. The drivetrain also includes an electric motor having a rotating mass operatively connected to the gearbox input shaft, and a control unit, the spring device being formed by linear springs, the rotating mass of the electric motor being designed as a secondary inertial mass.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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:
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receiving data from one or more sensors; determining a differential speed of rotation between the primary and secondary inertial masses based on the data; calculating the disturbance torque based on the differential speed 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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14. A method for active torsional vibration damping comprising:
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providing a drivetrain comprising; a combustion engine including a crankshaft with a primary inertial mass; a transmission input shaft drivingly engaged with an electric machine including a secondary inertial mass; a torsional vibration damper, including a plurality of linearly formed springs arranged around a circumference, the torsional vibration damper operatively arranged in a torque path between the crankshaft and the transmission input shaft to permit limited relative rotation of the secondary inertial mass relative to the primary inertial mass; and
,a control unit; the method comprising; exciting the drivetrain with torsional vibrations from the combustion engine; selecting an operating point of lesser vibration isolation; determining a disturbance torque Tdyn at the operating point of lesser vibration isolation in the torque path after the torsional vibration damper; calculating a compensation torque Tharm to compensate for the disturbance torque; and
,applying the compensation torque Tharm to the drivetrain with the electric machine. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification