DE102014213601A1 - Method for controlling an electric motor in a drive train, and control unit which is designed to control the electric motor and a motor vehicle with the control unit - Google Patents

Abstract

Embodiments relate to a method (60) for driving an electric motor (10) in a drive train (100) of a motor vehicle (70) with an internal combustion engine (24), wherein a Tilgerschwingungsdämpfer (52) is coupled to the electric motor (10). In this case, there is a drive (62) of the electric motor (10), so that the Tilgerschwingungsdämpfer (52) with a speed which is above a minimum speed is rotated about an axis of rotation, if to fear a drop in speed of the Tilgerschwingungsdämpfers (52) below a threshold speed is and / or occurs.

Description

Embodiments relate to a method for driving an electric motor in a drive train of a motor vehicle with an internal combustion engine, wherein a Tilgerschwingungsdämpfer is coupled to the electric motor, a computer program for performing the method, a control device which is adapted to drive the electric motor according to the method and a motor vehicle with the control unit.

Drive trains with an internal combustion engine and an electric motor, such as hybrid modules, are used in a variety of vehicles in different designs. About the internal combustion engine and rotational nonuniformities or unwanted vibrations can be coupled into the electric motor in a transmission of a drive torque. A torque component which leads to the undesired vibrations or rotational irregularities may possibly be due to an ignition behavior and / or a rotational speed or an operating state of the internal combustion engine. Unwanted vibrations may also be caused or promoted by other factors, such as a road surface over which the vehicle is moving.

In many cases, the powertrain includes a vibration reduction system to reduce unwanted vibration from the powertrain. This may be for example a Tilgerschwingungsdämpfer with movable absorber masses. In some operating conditions, for example, at low speeds, it may happen that the absorber masses abut each other or to other components, because the gravity is greater than the centrifugal force and the absorber masses fall in the direction of gravity. This may eventually lead to wear on the absorber masses and / or the other components. Furthermore, by the juxtaposition of the components also a noise or rattling occur. Both the wear and the noise are undesirable.

For example, this describes DE 100 05 582 A1 a drive arrangement with a driven by an internal combustion engine drive train and a functionally parallel thereto arranged electrical machine. On a rotor of the electric machine pendulum-like suspended absorber masses are arranged. Preferably, the absorber mass are sheathed with an elastic material. As a result, any rattling noises should be largely avoided by abutment of the absorber masses on a support member of the rotor or the electric machine. This sheath is complex and can not completely prevent the collision weights or absorber masses against each other or other components and a wear and possibly also a noise development.

Therefore, in addition to the fundamental need to improve vibration reduction in a powertrain, there is also a need to at least reduce wear and tear on components as well as noise. This need is taken into account by a method, a computer program, a control unit or a motor vehicle according to one of the independent claims.

Embodiments relate to a method for driving an electric motor in a drive train of a motor vehicle with an internal combustion engine. To the electric motor a Tilgerschwingungsdämpfer is coupled. The electric motor is driven so that the Tilgerschwingungsdämpfer at a speed which is above a minimum speed is rotated about an axis of rotation when a drop in speed of the Tilgerschwingungsdämpfers is to be feared below a threshold speed and / or occurs. Characterized in that a speed of the Tilgerschwingungsdämpfers is kept above a minimum speed, the occurrence of wear and noise can be at least reduced in some embodiments. This may be possible, for example, because the Tilgerschwingungsdämpfer is rotated at a speed which is so great that acting on the at least one damper mass of the Tilgerschwingungsdämpfers centrifugal force is greater than the force acting on the absorber mass gravity. The absorber mass then can not fall down in the direction of gravity. This can be avoided, for example, that the absorber mass abuts other components.

In addition, the driving may include rotating a rotor of the electric motor so that the absorber vibration damper is rotated at a speed higher than the minimum speed. Under certain circumstances, it can thus be made possible that a downward drop of the absorber masses of the absorber vibration damper, which is assigned to the rotor, is at least reduced or even completely avoided. In some embodiments, the rotor is coupled to the Tilgerschwingungsdämpfer with a gear or a reduction such that upon rotation of the electric motor and the Tilgerschwingungsdämpfer rotates. Optionally, the coupling can also be made so that upon rotation of the Tilgerschwingungsdämpfers and the electric motor rotates. A mechanical coupling of two components, for example between the electric motor and the Tail vibration damper includes both direct and indirect coupling.

For example, the Tilgerschwingungsdämpfer may comprise at least one absorber mass, which is adapted to perform in response to a rotational movement or rotation of the Tilgerschwingungsdämpfers a vibration to dampen the vibration component thereof. Further, the Tilgerschwingungsdämpfer may have at least one guide structure which is adapted to guide the absorber mass to move. For example, the absorber mass is not used to transmit torque. Under certain circumstances, the guide structure or at least one of the guide structures of the Tilgerschwingungsdämpfers coupled to the rotor, for example, be rotatably connected. A stator of the electric motor can be arranged stationary and / or rotationally fixed, possibly based on the drive train. For example, the rotor of the electric motor may be coupled to a drive shaft of the drive train.

Additionally or alternatively, the method may include disconnecting a rotationally fixed connection between an input side of the electric motor and an output side of the internal combustion engine and / or an output side of the electric motor and an input side of a transmission. Under certain circumstances, such a rotation or operation of the electric motor can be made independent of a transmission and / or the internal combustion engine, so for example, when the vehicle is stationary and / or the engine is turned off.

Additionally or alternatively, the electric motor can be driven or operated so that a rotation of the Tilgerschwingungsdämpfers is terminated when a predetermined condition is met. In some embodiments, such a complete shutdown of the electric motor and thus also the motor vehicle or the drive train as possible wear and / or low noise are possible. After the condition has occurred, the electric motor can be completely stopped or switched off, or it can continue to operate at a speed below the minimum speed.

In addition, the method may include checking whether the predetermined condition is met and driving or operating the electric motor so that the Tilgerschwingungsdämpfer is rotated at a speed above the minimum speed when fulfillment of the predetermined condition is still outstanding. In some embodiments, it can thus be made possible that the electric motor is not yet turned off or operated at a speed below the minimum speed, if this is unfavorable due to external circumstances. Such circumstances may be present, for example, when a renewed operation at a higher speed is expected again shortly and / or the noise is particularly unfavorable at this time.

For example, driving or operating the electric motor may be performed such that the idler vibration damper is rotated at a rotational speed higher than the minimum rotational speed when a torque transmission path between the electric motor and the internal combustion engine and a torque transmission path between the electric motor and the transmission are disconnected Fulfilling the predetermined condition is still outstanding. In some embodiments, for example, in a start-stop operation or when the vehicle is stationary, it can be avoided that the electric motor likewise comes to a standstill or is operated below the minimum rotational speed and the at least one absorber mass drops downwards.

The predetermined condition can be met, for example, if at least one shutdown of the internal combustion engine has taken place. In some embodiments, it can be concluded that the vehicle should not be put back into operation immediately and a renewed lifting of the at least one absorber mass of the component on which it rests, not immediately expected again.

Additionally or alternatively, the predetermined condition may also be fulfilled if at least one of the motor vehicle has been locked and / or at least one occupant and / or occupant has left or has an interior of the motor vehicle or the motor vehicle itself and / or a person has an environment of Motor vehicle has left. In some embodiments, it can thus be made possible that the at least one absorber mass first falls in the direction of gravity and may possibly cause a noise when nobody is sitting in the motor vehicle or within earshot. The person may be, for example, a driver of the motor vehicle, an occupant, and / or a pedestrian.

Additionally or alternatively, the predetermined condition may also be fulfilled if at least one time interval has elapsed, which begins when one of the states is present. The fact that the noise, which can also be referred to as Abstellklappern is allowed only when conditions are met, suggesting that the person has moved away from the vehicle, it can be assumed in some embodiments, that the person Driver and / or the occupant, far enough away to the parking rattle at least no longer perceive as annoying or to hear at all.

The time interval may, for example, be variable, programmable and / or have a fixed value. Due to the fact that the time interval has a fixed value, in some embodiments it may, for example, be adapted to the type of motor vehicle in which the electric motor or drive train is used. For example, the changeability or programmability of the time interval makes it possible to adapt the time interval to an intended use of the motor vehicle and / or specific wishes and / or user habits of a user and / or purchaser.

Embodiments relate to a computer program for performing the method according to at least one of the embodiments, when the computer program runs on a programmable hardware. A programmable hardware component may be integrated by a processor, a central processing unit (CPU), a graphics processing unit (GPU), a computer, a computer system, an application-specific integrated circuit (ASIC) Circuit (IC = Integrated Circuit), a system on chip (SOC) system, a programmable logic element or a field programmable gate array with a microprocessor (FPGA = Field Programmable Gate Array) may be formed.

Embodiments also relate to a control device which is designed to control an electric motor according to the method according to at least one of the preceding embodiments. For example, a controller may be any device configured to cause the electric motor to be driven in accordance with at least one embodiment of the method. For example, it may be one of said programmable hardware components.

The control unit is thus designed to control or operate the electric motor such that the absorber vibration damper is rotated about a rotational speed above a minimum speed about an axis of rotation when a drop in rotational speed of the absorber vibration damper is to be feared and / or occurs below a threshold speed.

In addition, the controller may be configured to control the electric motor to cause rotation of a rotor of the electric motor to rotate the damper vibration damper at a speed greater than the minimum speed.

Additionally or alternatively, the controller may also be configured to effect a disconnection of a rotationally fixed connection between an input side of the electric motor and an output side of the internal combustion engine and / or an output side of the electric motor and an input side of a transmission.

Further, the controller may be configured to drive the electric motor to cause termination of the rotation of the Tilgerschwingungsdämpfers when a predetermined condition is met. This may, for example, be one of the named predetermined conditions.

For example, the controller may be configured to check whether the predetermined condition is met and based on causing driving of the electric motor such that the damper vibration damper is rotated at a speed higher than the minimum speed when the predetermined condition is still met pending.

Additionally or alternatively, the control unit may also be configured to control the electric motor such that rotation of the Tilgerschwingungsdämpfers at a speed which is above the minimum speed, when a torque transmission path between the electric motor and the internal combustion engine and / or a torque transmission path between the electric motor and the transmission is disconnected and a fulfillment of the predetermined condition is still outstanding.

Embodiments further relate to a motor vehicle with a control device according to at least one of the preceding embodiments. In addition, in some embodiments, the motor vehicle may comprise at least one circuit which is designed to detect a shutdown of an internal combustion engine of the motor vehicle. In some embodiments, it can thus be recognized whether a predetermined condition exists.

Additionally or alternatively, the motor vehicle may comprise at least one circuit which is designed to detect a completion of the motor vehicle. In some embodiments, such suitable devices or devices may be provided to the motor vehicle that can detect the presence of the condition.

Additionally or alternatively, the motor vehicle may also comprise at least one sensor which is designed to prevent at least one and / or all occupants of the motor vehicles from leaving to capture. The sensor or another sensor can also be designed to detect a departure of a person from an environment of the motor vehicle.

Further advantageous embodiments will be described in more detail below with reference to exemplary embodiments illustrated in the drawings, to which exemplary embodiments are not restricted. Show it:

1 a schematic representation of an electric motor in a drive train is driven by a method according to an embodiment;

2 a detailed schematic representation of a section of a drive train of 1 ;

3 a schematic representation of a method for driving an electric motor according to an embodiment;

4 a schematic representation of a motor vehicle is driven according to an embodiment.

In the following description of the accompanying drawings, like reference characters designate like or similar components. Further, summary reference numbers are used for components and objects that occur multiple times in one embodiment or in one representation, but are described together in terms of one or more features. Components or objects which are described by the same or by the same reference numerals may be the same, but possibly also different, in terms of individual, several or all features, for example their dimensions, unless otherwise explicitly or implicitly stated in the description.

The 1 shows a schematic representation of an electric motor 10 in a drive train 100 which is driven by a method according to an embodiment. In the powertrain 100 of the 1 it is just an example. By means of the method according to at least one of the exemplary embodiments, it is also possible to actuate another electric motor in another drive train.

The electric motor 10 is with a vibration reduction system 4 to a hybrid module 2 coupled. With the electric motor 10 can torque to an output side 8th of the hybrid module. The electric motor 10 , which may also be referred to as an electric motor, comprises a stator 12 and a rotor 14 , The rotor 14 can with a torque transmitting shaft 16 rotated or rotatably connected while the stator 12 rotationally fixed relative to the hybrid module 2 or whose housing is fixed. The stator 12 is radially outside the rotor 14 arranged. This is the electric motor 10 around an inner rotor. In some other embodiments, not shown, the electric motor may also be an external rotor and the rotor is then arranged radially outside the stator.

The vibration reduction system 4 includes a primary inertia 18 and a secondary inertia 20 , The primary inertia 18 is with the secondary inertia 20 via two spring elements 22 connected. The vibration reduction system 4 For example, it may be configured as a dual-mass flywheel or as a damper in all possible shapes and combinations. In some other embodiments, not shown, the powertrain may also be configured without the vibration reduction system or include another vibration reduction system.

The hybrid module 2 is how in 1 shown on an input side 6 with an internal combustion engine 24 connected. In the internal combustion engine 24 It is the driving internal combustion engine, so a device that converts fuel in a chemical process directly into a mechanical movement, for example gasoline engine, diesel engine, Wankel engine, gas turbine or the like.

A torque is on the input side 6 in the hybrid module 2 initiated and via the vibration reduction system 4 and the wave 16 to the exit side 8th transfer. At the exit side 8th the torque is applied to a residual drive train 26 transfer. The residual drive train 26 For example, a transmission, a drive shaft, at least one side shaft or a plurality of side shafts, at least one wheel and / or further components of the vehicle comprise.

With the vibration reduction system 4 For example, some rotational nonuniformities can be reduced in the hybrid module 2 be coupled. With the electric motor 10 Under certain circumstances, a reduction of the rotational irregularities can also be effected by applying a torque to the shaft 16 is imposed, which is opposite to the rotational irregularity. The electric motor 10 is a control circuit 32 or an in 4 represented control unit 74 assigned, by means of or the electric motor 10 is controlled. There are also two sensors 28 and 30 provided, which may also be referred to as state detection sensors. The sensors 28 and 30 are each at the primary inertia 18 and secondary inertia 20 arranged and can, for example, provide information about the occurrence of vibrations. In some other embodiments, not shown, the electric motor 10 not used to compensate for rotational nonuniformity. For example, the sensors 28 and 30 and / or the control circuit 32 omitted.

The hybrid module 2 also includes a storage unit 38 with a capacitor 40 and a battery 42 , In the storage unit 38 For example, energy that has been converted into electrical energy during generator operation of the electric motor can be stored. In some other, not shown embodiments, the memory unit may be formed in other ways, for example, include only the battery or only the capacitor or omitted.

The 2 shows a detailed schematic representation of a section of the drive train 100 of the 1 with further details, which are described below.

The hybrid module 2 is how in 2 recognizable, via a schematically illustrated, flexible connection plate 44 with a crankshaft and so not the internal combustion engine 24 connected. Via a coupling device 46 , which may also be referred to as a transmission disconnect clutch, may be the electric motor 10 at its exit 8th with the in 2 not shown residual drive train 26 connected or disconnected from this. The electric motor 10 is via another coupling device 48 , which may also be referred to as an engine disconnect clutch, with the vibration reduction system 4 or the input side 6 of the hybrid module 2 connectable or separable from this. In the coupling devices 46 and 48 For example, it may be a coupling, ie a machine element for the detachable connection of two shafts. This may be, for example, a positive or a non-positive connection. Examples of a coupling device are: friction clutch, slip clutch, viscous coupling, fluid coupling. Furthermore, the vibration reduction system includes 4 a sledge 50 , In some embodiments, the absorber 50 on the vibration reduction system 4 also omitted.

The electric motor 10 is a damper vibration damper 52 , which may also be referred to as a Tilger or Fliehgewichttilger assigned. The absorber vibration damper 52 may have at least one absorber mass or mass, not shown. This absorber mass can be deflected to damp a vibration or a rotational irregularity. For this purpose, the at least one absorber mass or a plurality of absorber masses is movable on a guide structure of the absorber vibration damper 52 guided. The absorber mass is usually not in a torque transmission path or transmits no torque. At the absorber vibration damper 52 and / or the absorber 50 it may be, for example, a Festfrequenztilger, a Ordnungstilger, possibly in the form of a Sarazzin pendulum or the like.

The absorber vibration damper 52 , which can also be referred to as a centrifugal pendulum, or whose guiding structure is with the rotor 14 of the electric motor 10 connected. In some embodiments, the guide structure may be part of the rotor 14 be. In some other embodiments, the Tilgerschwingungsdämpfer 52 rotatably with the rotor 14 be coupled. Optionally, the rotor 14 or the electric motor 10 with the absorber vibration damper 52 or whose guide structure also be coupled with an over or a reduction in such a way so that upon rotation of the electric motor 10 also the absorber vibration damper 52 rotates. Optionally, the coupling can also be made so that upon rotation of the Tilgerschwingungsdämpfers 52 also the electric motor 10 rotates. A mechanical coupling of two components, for example between the electric motor 10 and the absorber vibration damper 52 includes both direct and indirect coupling.

The shutdown of the system or powertrain 100 or even falling below a minimum speed may under certain circumstances lead to the fact that the force of gravity is greater than a centrifugal force on the absorber masses of Tilgerschwingungsdämpfers 52 acts. This can lead to the at least one absorber mass and / or the centrifugal pendulum falling in the direction of the centrifugal force. When falling or a subsequent impact may be a clearly audible noise, which can also be referred to as Abstellklappern occur. Especially with frequent start-stop operations, the constant Abstellklappern is disturbing and the associated wear is undesirable. In order to at least reduce the Abstellklappern and wear, the electric motor can be controlled by a method according to an embodiment.

The 3 shows a schematic representation of a method 60 for driving the electric motor in the drive train according to an embodiment. In the process 60 is in a process 62 the electric motor is controlled so that the Tilgerschwingungsdämpfer with a speed above a minimum speed by one Rotation axis is rotated when a drop in speed of the Tilgerschwingungsdämpfers is to be feared below a threshold speed and / or occurs.

A minimum speed may be greater than, less than or equal to a threshold speed. If a drive is performed so that a certain function is achieved, that is, for example, a component is rotated at a certain speed, this can lead to an operation of the component with the corresponding function, so for example correspond to a rotation of the component at the specific speed. The same applies accordingly to operating or driving a component with another function. A threshold speed may be a speed at which a force acting on the at least one absorber mass, which can also be referred to as centrifugal weight, is greater than a centrifugal force. In other words, a threshold speed may be a speed at which the absorber masses may strike other components as they fall down. The rotation of the Tilgerschwingungsdämpfers with the rotational speed above the minimum speed, for example, be done until a predetermined condition occurs. In some embodiments, in the method 60 Also, a rotationally fixed connection between an input side of the electric motor and an output side of the internal combustion engine and / or an output side of the electric motor and an input side of a transmission in one operation 64 be separated.

Furthermore, in another process 66 to check whether a predetermined condition is satisfied, and a driving 62 of the electric motor so that the Tilgerschwingungsdämpfer is rotated at a speed which is above the minimum speed, when a fulfillment of the predetermined condition is still outstanding. The predetermined condition may be, for example, a shutdown of the internal combustion engine, a locking of the motor vehicle and / or leaving at least one occupant or all occupants of an interior of the motor vehicle and / or leaving a person of an environment of the motor vehicle.

For example, the predetermined condition may be met only when a time interval has elapsed, which begins with the occurrence of one of the said events. If more than one of the events that may result in the condition being met, the condition may not be met until the last time interval has elapsed. The time interval can be selected, changed and / or programmed, for example, depending on the condition, a vehicle, a user and / or a situation.

The 4 shows a schematic representation of a motor vehicle 70 with an electric motor 10 in a drive train 100 that with a procedure 60 is driven according to an embodiment. The car 70 includes a controller 72 that is designed to be the electric motor 10 after the procedure 60 or to control a method according to at least one of the embodiments.

The car 70 includes at least one circuit 74 , which is designed to switch off the internal combustion engine 24 capture. For example, this circuit 74 Be part of a vehicle and / or a motor control. In some embodiments, the circuit 74 also omitted.

Furthermore, the motor vehicle includes 70 at least one sensor 76 which is adapted to detect a departure of at least one and / or all occupants of the motor vehicle. The sensor 76 For example, in an interior 78 be arranged of the vehicle. This may be, for example, a motion sensor, a temperature sensor, a noise sensor, a vibration sensor and / or the like. Under certain circumstances, sensors that monitor other conditions already in the motor vehicle 74 be provided, be used. In some embodiments, the sensor 76 also omitted.

To leave a person of an environment 82 of the motor vehicle 70 to detect the motor vehicle 70 a sensor 80 on. In the environment 82 of the motor vehicle 70 For example, it may be an area around the motor vehicle 70 act that is so great that the parking rattling in the motor vehicle 70 outside the environment 82 is no longer perceived. The environment 82 For example, it may have a radius of 2m, 5m, 10m and / or at least 15m around the motor vehicle 70 exhibit. Alternatively, the environment 82 also have a smaller radius, it being understood that the driver or a person then after the lapse of a period or time interval, the leaving the environment 82 begins to have moved far enough away to stop the parking rattle.

In some embodiments, the sensor 80 also omitted. The further sensor may be, for example, a control circuit or a signal generator on a vehicle key.

Furthermore, the motor vehicle 70 in some embodiments, at least one circuit 84 comprise, which is designed to complete the motor vehicle 70 capture. For example, with the circuit 84 a closing signal is detected and / or received by a locking system of the motor vehicle. In some embodiments, the circuit 84 also omitted.

The car 70 Thus, it has sensors or circuits with which it can be established or at least concluded that the electric motor is switched off 10 or operation below a threshold speed does not lead to disrupting a driver, or user, because at least can be assumed that this already far enough from motor vehicle 70 has removed. For example, it can also be determined or at least concluded that the electric motor 10 will soon be operated again above the threshold speed and it is only a brief drop in speed, as in a start-stop operation. Then possibly lowering the speed of the Tilgerschwingungsdämpfers 52 omitted to reduce wear. In start-stop operation, as may occur during stowage phases, for example, running or operating or rotating the rotor may occur 14 consume relatively little energy, so for example energetically not disturb. Under certain circumstances, only one friction torque of a bearing of the rotor 14 be compensated and / or it can even be driven completely electrically.

With the procedure 60 or the control unit 62 or the motor vehicle 70 In some embodiments, the Abstellklappern or the associated wear can thereby be avoided or at least reduced that when the coupling device is open 48 and / or with the coupling device open 46 , which may be one of the numerous existing in the transmission separation points, the rotor 14 including the absorber vibration damper 52 , which can also be referred to as centrifugal pendulum, can be kept at such a high speed that no Abstellklappern arises. The system or the electric motor 10 can then after the final shutdown of the engine 24 , For example, after a time interval, which can also be referred to as dead time, also be turned off. When choosing the length of the time interval or the dead time, it can be assumed that the driver is far enough away from the motor vehicle 70 or vehicle so that he no longer perceives the parking rattle. For example, the dead time or the time interval with the completion of the motor vehicle 70 kick off. In some embodiments, a disturbing Abstellklappern be eliminated by the centrifugal pendulum or the Tilgerschwingungsdämpfer 52 to the electric motor 10 is connected.

The procedure 60 or the control unit 72 But not only, as for the 4 described in a car, but also in all other vehicles and motor vehicles, such as trucks, work machines, work vehicles, construction vehicles, agricultural machinery and / or the like can be used.

The embodiments disclosed in the foregoing description, the appended claims and the appended figures, as well as their individual features, may be relevant and implemented both individually and in any combination for the realization of an embodiment in its various forms.

In some other embodiments, features disclosed as a device feature in other embodiments may also be implemented as method features. Further, features that are implemented as method features in some embodiments may also be implemented as device features in other embodiments.

LIST OF REFERENCE NUMBERS

2

hybrid module

4

Vibration reduction system

6

input side

8th

output side

10

electric motor

12

stator

14

rotor

16

wave

18

primary inertia

20

secondary inertia

22

spring element

24

internal combustion engine

26

Rest powertrain

28

sensor

30

sensor

32

control circuit

38

storage unit

40

capacitor

42

battery

44

flexible connection plate

46

coupling device

48

coupling device

50

absorber

52

Tilgerschwingungsdämpfer

60

method

62

head for

64

Separate

66

To verify

70

motor vehicle

72

control unit

74

circuit

76

sensor

78

inner space

80

sensor

82

Surroundings

84

circuit

100

powertrain

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10005582 A1 [0004]

Claims (15)

Procedure ( 60 ) for driving an electric motor ( 10 ) in a drive train ( 100 ) of a motor vehicle ( 70 ) with an internal combustion engine ( 24 ), wherein a Tilgerschwingungsdämpfer ( 52 ) with the electric motor ( 10 ), with the following features: 62 ) of the electric motor ( 10 ), so that the Tilgerschwingungsdämpfer ( 52 ) at a speed which is above a minimum speed, about an axis of rotation is rotated when a decrease in a speed of the Tilgerschwingungsdämpfers ( 52 ) is to be feared under a threshold speed and / or occurs. Method according to claim 1, wherein the driving ( 62 ) of the electric motor ( 10 ) turning a rotor ( 14 ) of the electric motor ( 10 ), so that the Tilgerschwingungsdämpfer ( 52 ) is rotated at a speed higher than the minimum speed. Method according to one of the preceding claims, further comprising separating ( 64 ) a rotationally fixed connection between an input side of the electric motor ( 10 ) and an output side of the internal combustion engine ( 24 ) and / or an output side of the electric motor ( 10 ) and an input side of a transmission. Method according to one of the preceding claims, wherein the driving ( 62 ) of the electric motor ( 10 ), so that a rotation of the Tilgerschwingungsdämpfers ( 52 ) is terminated when a predetermined condition is met. The method of claim 4, further comprising checking ( 66 ), whether the predetermined condition is met, and a driving ( 62 ) of the electric motor ( 10 ) is carried out so that the Tilgerschwingungsdämpfer ( 52 ) is rotated at a speed that is above the minimum speed, when a fulfillment of the predetermined condition is still outstanding. Method according to one of the preceding claims 4 or 5, wherein the driving ( 62 ) of the electric motor ( 10 ) is carried out so that the Tilgerschwingungsdämpfer ( 52 ) is rotated at a speed that is above the minimum speed, when a torque transmission path between the electric motor ( 10 ) and the internal combustion engine ( 24 ) and a torque transmission path between the electric motor ( 10 ) and the transmission is disconnected and a fulfillment of the predetermined condition is still outstanding. Method according to one of claims 4 to 6, wherein the predetermined condition is met, if at least - a shutdown of the internal combustion engine ( 24 ) and / or - completing the motor vehicle ( 70 ) and / or - at least one occupant and / or occupant of an interior space ( 78 ) of the motor vehicle ( 70 ) and / or - and / or - a person has an environment ( 82 ) of the motor vehicle ( 70 ) has left. The method of claim 7, wherein the predetermined condition is at least satisfied when a time interval has elapsed, which at least begins when - a shutdown of the internal combustion engine ( 24 ) and / or - completing the motor vehicle ( 70 ) and / or - at least one occupant and / or occupant of an interior space ( 78 ) of the motor vehicle ( 70 ) and / or - and / or - a person has an environment ( 82 ) of the motor vehicle ( 70 ) has left.  Method according to one of claims 4 to 8, wherein the time interval is variable, programmable and / or has a fixed value.  Computer program for carrying out the method according to one of claims 1 to 9, when the computer program runs on a programmable hardware. Control unit ( 72 ), which is designed to be an electric motor ( 10 ) according to the method ( 60 ) according to at least one of claims 1 to 10. Motor vehicle ( 70 ) with a control device ( 72 ) according to claim 11. Motor vehicle according to claim 12, further comprising, at least one circuit ( 74 ), which is designed to switch off an internal combustion engine ( 24 ) of the motor vehicle ( 70 ) capture. Motor vehicle according to one of claims 12 or 13, further comprising, at least one sensor ( 76 ) configured to prevent at least one and / or all occupants of the motor vehicle ( 70 ) and / or which is designed to prevent a person from leaving an environment ( 82 ) of the motor vehicle ( 70 ) capture. Motor vehicle according to one of claims 12 to 14, further comprising, at least one circuit ( 84 ), which is designed to lock the motor vehicle ( 70 ) capture.

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