DE102016225316A1 - Method for vibration reduction in a hybrid drive - Google Patents

Abstract

In order to provide a method for vibration reduction in a hybrid drive for a motor vehicle, with which vibrations of a motor vehicle, a hybrid drive or an internal combustion engine are reduced, and with which the fuel consumption is reduced and achieves an improved overall CO balance, increased efficiency of the hybrid drive and an acoustic improvement A method is proposed for vibration reduction in a hybrid drive (100) for a motor vehicle, wherein the hybrid drive (100) comprises an electric machine (11) and an internal combustion engine (10), wherein in at least one vibration reduction phase (21, 22) an operating value of a Electric machine operating variable, in particular an electric machine torque and / or an electric machine speed and / or an electric machine power, the electric machine (11) is modulated with a vibration, wherein the amplitude of the vibration is smaller than the Bet rag of the operating value of the electric machine operating variable, so that the modulated electric machine operating variable during the at least one vibration reduction phase (21, 22) is always positive or negative.

Description

The present invention relates to a method for vibration reduction in a hybrid drive for a motor vehicle and a hybrid drive for a motor vehicle and a motor vehicle with a hybrid drive.

To reduce the fuel consumption of motor vehicles and to comply with emission regulations, in particular with regard to the CO2 emissions so-called hybrid drives are known in automotive engineering. A hybrid drive comprises at least one internal combustion engine and at least one electric machine, also called an electric machine. The electric machine or the electric machine serves to support the internal combustion engine so that it has to contribute less to provide a total requested by the driver of a motor vehicle. The electric machine contributes the difference to the requested power. Even a purely electrical operation in which the electric machine provides the total requested by the driver of the motor vehicle overall performance is possible.

Parallel hybrid drives, serial hybrid drives and branched hybrid drives are known from the prior art. During operation of a hybrid drive, the electric machine and the internal combustion engine work together in the different operating states, wherein the total load is divided depending on the driving situation on the electric machine and the internal combustion engine.

Even in the operation of a hybrid drive but unnecessarily lost energy. One cause for the energy loss and thus for increased fuel consumption and CO2 emissions is for example in vibrations and vibrations of the motor vehicle or the hybrid drive and / or the internal combustion engine or in a negative for the efficiency or efficiency operating state of the electric machine or the internal combustion engine.

State of the art

Methods of active vibration damping are known in the art.

The DE 10 2006 036 217 A1 discloses a method for controlling a hybrid drive, wherein the hybrid drive comprises at least one internal combustion engine and at least one electric machine with at least one electric motor function and at least one generator function. For vibration damping, the modulation of at least one operating variable of the at least one electric motor function can be used.

The EP 2 848 485 A1 discloses a vehicle damping control apparatus wherein an electric power generator is driven by an internal combustion engine, wherein a regulating means controls a field current passing through a generator excitation winding such that the generated generator voltage is controlled such that a torque value of the generator suppresses vibrations in the vehicle.

From the DE 10 2012 203 778 A1 a method for controlling a hybrid powertrain and a accumulator device is known therein, wherein the accumulator device has at least two electric accumulators and wherein at least temporarily in the cycle of residual vibrations of a torsional vibration damper one of the accumulators is charged while the other is discharged.

In the classical active vibration damping in a motor vehicle with hybrid drive, an operating value of an electric machine operating variable, in particular an electric machine torque is varied to counteract vibrations and vibrations of the motor vehicle, the hybrid drive or the internal combustion engine. The variation consists in particular in a modulating of a vibration or a frequency or a frequency spectrum on the electric machine operating variable, in particular on the electric machine torque.

In the pure internal combustion engine mode, in which only the internal combustion engine provides the requested drive power and thus the electric machine power or the electric machine torque provided by the electric motor of the hybrid motor is zero, this modulation of the oscillation or the frequency spectrum means that the modulated electric machine operating variable, In particular, the modulated electric machine torque, oscillates between a positive and a negative operating value, so that the electric machine operating variable, in particular the electric machine torque, has constantly recurring zero crossings. The electric machine thus experiences a permanent load change and can thereby audible abnormalities by e.g. Cause games in the system.

In addition, the electric machine is operated in the classical active vibration damping in hybrid powertrains in an unfavorable load range, so that a poor efficiency results. The electric machine has particular in the Low electric machine torques and, in particular, sign changes of electric machine torque are much inferior in efficiency than other operating values.

Presentation of the invention, object, solution, advantages

It is an object of the present invention to provide a method for reducing vibration in a hybrid drive for a motor vehicle, with which vibrations of a motor vehicle, a hybrid drive or an internal combustion engine can be reduced, and with which reduces fuel consumption and improved overall CO2 balance, increased efficiency of the Hybrid drive and an acoustic improvement is achieved. It is another object of the present invention to provide a hybrid drive and a motor vehicle comprising a hybrid drive.

To solve the object underlying the invention, a method for vibration reduction in a hybrid drive for a motor vehicle is proposed, wherein the hybrid drive comprises an electric machine and an internal combustion engine, wherein in at least one vibration reduction phase an operating value of an electric machine operating variable, in particular an electric machine torque and / or an electric machine speed and / or an electric machine power, the electric machine is modulated with a vibration, wherein the amplitude of the vibration is smaller than the amount of the operating value of the electric machine operating variable, so that the modulated electric machine operating variable during the at least one vibration reduction phase always is positive or negative.

A vibration is also understood to mean a vibration and / or a frequency and / or a frequency spectrum, so that the method also includes the modulation of an operating value of an electric machine operating variable with a vibration, a frequency or a frequency spectrum.

The amplitude of the vibration during the vibration reduction phase is smaller than the amount of the operating value of the electric machine operating variable, so that the modulated electric machine operating variable during the at least one vibration reduction phase is always positive or negative. This means that the electric machine operating variable, in particular the electric machine torque, during the vibration reduction phase has no zero crossing, so that, especially when the electric machine operating variable is the electric machine torque, no load change occurs. By avoiding a load change or a zero crossing of the electric machine operating variable an acoustic conspicuousness or excitation is avoided, so that there may be an acoustic improvement. In addition, the electric machine and / or the internal combustion engine is advantageously operated in a more favorable load range, so that the fuel consumption is reduced and thereby the overall CO2 balance is improved. Since the modulated electric machine operating variable during the at least one vibration reduction phase is always positive or negative, and thus does not oscillate around the zero point, can also be spoken of a method for vibration reduction in a hybrid drive with load point shift.

The operating value of the electric machine operating variable may be given by the power requirement to the hybrid drive. If, for example, the electric machine operating variable is the electric machine torque, the value of the electric machine torque is determined inter alia from the total torque requested by a driver of the motor vehicle and the torque provided by the internal combustion engine. It should be noted as a boundary condition that the sum of the electric machine torque and the torque supplied by the internal combustion engine corresponds to the requested total torque. The distribution of the total torque to the electric machine torque and the torque supplied by the internal combustion engine is thereby made so that the electric machine and / or the internal combustion engine run in a favorable load range and thus have a higher efficiency.

Further, it is possible that the sum of the amounts of the electric machine operation amount and the corresponding operation amount of the internal combustion engine is larger than the requested total operation amount, for example, the value of the operation amount of the internal combustion engine is positive and the operation value of the electric machine operation amount of the electric machine is negative , For example, if the amount of operation is the torque, it may be provided that the torque delivered by the engine is positive, whereas the electric machine torque is negative, so that in sum the requested total torque is supplied by the hybrid drive.

Of course, the operating quantity provided by the internal combustion engine may also be negative, and the electric machine operating variable may then be positive.

It is preferably provided that the amplitude and / or the phase of the oscillation are determined in this way be that vibrations, in particular vibrations of the motor vehicle, preferably the hybrid drive, in particular preferably the internal combustion engine can be reduced.

By modulating a vibration or a frequency or a frequency spectrum, the operating value of the electric machine operating variable is varied, so that vibrations in the hybrid drive, in particular in the electric machine, are excited. With the right choice of amplitude and phase of the oscillation or the frequency caused by the modulated operating value vibrations in the hybrid drive interfere destructively with the vibrations of the motor vehicle or the hybrid drive or the internal combustion engine, so these motor vehicle vibrations are reduced or extinguished.

Furthermore, it is preferably provided that the operating value of the electric machine operating variable is determined so that the electric machine and / or the internal combustion engine are operated in an operating state with an improved efficiency and / or an improved efficiency.

By operating the electric machine and / or the internal combustion engine in an operating state with improved efficiency and / or improved efficiency of the fuel consumption is lowered and in particular the CO2 balance improved. Particularly in the field of low electric machine torques, an electric machine has a comparatively poor efficiency. For this reason, the electric machine operating variable, in particular the electric machine torque, is determined so that the electric machine has a significantly better efficiency. This is achieved in particular in that the electric machine torque is not close to zero, or has no zero crossing. Therefore, there is advantageously a load point shift away from values near zero to larger positive or negative values of the electric machine operating quantity.

The internal combustion engine also has an ideal range of the corresponding operating variable, for example the torque in which the internal combustion engine has the highest efficiency. Therefore, e.g. the operating value of the electrical machine operating variable are selected so that the electric machine is operated in an optimum operating range as possible with optimum efficiency. Alternatively or simultaneously, the operating value of the electric machine operating variable can be selected so that the internal combustion engine is operated in an optimal efficiency range. Under certain circumstances, in this case, the operating value of the electric machine operating variable determined by this requirement may deviate from an optimum value with an optimum efficiency.

Further, it is also possible that the operating value of the electric machine operating variable and the value of the corresponding operating variable of the internal combustion engine in the sense of a compromise are adapted to each other such that overall the maximum or optimal efficiency of the hybrid drive is set.

It is preferably provided that no load change of the electric machine occurs during the at least one vibration reduction phase.

By avoiding a load change of the electric machine, the emergence of acoustic abnormalities is prevented and the electric machine is operated in a favorable load range, so that an overall higher efficiency is achieved. This improves fuel consumption and, as a result, the CO2 balance.

Further preferably, it can be provided that, after a first vibration reduction phase with a positive or a negative operating value of the electric machine operating variable, a second vibration reduction phase is performed with a negative or a positive operating value of the electric machine operating variable, preferably vibration reduction phases with a positive operating value of the electric machine operating variable and oscillation reduction phases alternate with a negative operation value of the electric machine operation amount.

That is, a first vibration reduction phase may have a positive operation value of the electric machine operation amount, and a directly subsequent second vibration reduction phase may have a negative operation value of the electric machine operation amount, or vice versa. In both the first and second vibration reduction phases, the respective operating value of the electric machine operating variable and the amplitude of the modulated vibration are selected such that the modulated operating machine operating variable is always positive or negative during the first and during the second vibration reduction phase. However, since the operating value of the electric machine operating variable changes from a positive to a negative value or vice versa in the transition from the first vibration reduction phase to the second vibration reduction phase, a zero crossing of the electric machine operating amount occurs in the transition precisely between the two vibration reduction phases. The zero crossing thus characterizes the Change from the first vibration reduction phase to the second vibration reduction phase. For example, assume that the electric machine operating quantity is the electric machine torque. Further, the operating value of the electric machine torque in the first vibration reduction phase is positive. During the entire first vibration reduction phase, therefore, the modulated electric machine torque is also positive. The total torque required for the respective driving condition of the motor vehicle is provided in part by the electric machine torque and in part by the torque supplied by the internal combustion engine. After the end of the first vibration reduction phase, a negative operating value of the electric machine torque is selected. Accordingly, to obtain the requested total torque, the internal combustion engine must supply a torque which is greater than the requested total torque so that the sum of the positive torque of the internal combustion engine and the negative electric machine torque corresponds to the requested total torque.

During the first vibration reduction phase, in which the electric machine provides a positive electric machine torque, a battery of the hybrid drive is discharged. In the second phase, in which the electric machine supplies a negative electric machine torque, however, the battery is recharged. As a result, the battery power is stabilized on average, so that the battery contains a much constant charge.

After performing the first vibration reduction phase and the second vibration reduction phase, the method may again start from the beginning with the first vibration reduction phase such that alternate during the operation of the hybrid drive vibration reduction phases, each successive vibration reduction phases have a different sign for the operating value of the electric machine operating variable.

It can preferably be provided that a duration of the first and / or the second, in particular each, vibration reduction phase is selected as a function of a state of charge of a battery.

Furthermore, the duration of the first and / or the second, in particular each, vibration reduction phase can be selected as a function of the operating points of the internal combustion engine and / or the electric machine.

Advantageously, the method can also be carried out over a long period of time in a regenerative mode in which the battery is charged.

It can preferably be provided that the first and / or the second, in particular each, vibration reduction phase lasts at least 10 seconds, preferably at least 20 seconds, particularly preferably at least 30 seconds.

Most preferably, each vibration reduction phase lasts exactly 30 seconds.

An appropriate choice of the duration of the vibration reduction phases ensures that the battery of the hybrid drive is only slightly discharged or recharged. This extends the life of the battery.

Further preferably, it can be provided that the modulated electric machine operating variable during operation of the hybrid drive, is always always positive or negative, preferably the modulated electric machine operating variable is held substantially always in a quadrant of an efficiency map, more preferably a force-transmitting connection , in particular a shaft, the electric machine with the internal combustion engine is biased and / or loaded substantially at any time of the operation of the hybrid drive.

An efficiency map can be represented as a two-dimensional Cartesian coordinate system, wherein the electric machine speed of the electric machine is plotted on the X-axis or abscissa, and wherein the electric machine torque is plotted on the Y-axis or ordinate. The four quadrants are labeled counterclockwise with Q1, Q2, Q3 and Q4. The level of the number tuples of electric machine speed and electric machine torque represent possible operating states of the electric machine. In the efficiency map, operating states are connected with equal efficiency by heights or potential lines. Not all operating states have the same efficiency, especially in the area of or on the X-axis and the Y-axis, the electric machine has a much lower efficiency.

An operating value of the electric machine operating variable is advantageously selected so that the modulated electric machine operating variable is always kept in one quadrant of an efficiency map during operation of the hybrid drive, wherein, if possible, the operating state selected in the quadrant has a higher efficiency than other possible ones operating conditions. The vast operation in one Quadrant of the efficiency map gives the load point shift of the process.

The modulated electric machine operating variable is essentially always positive or negative, meaning essentially that the modulated electric machine operating variable does not become zero except for times of change between the vibration reducing phases.

Furthermore, it can preferably be provided that the modulated electric machine operating variable is always positive or negative during the entire operation of the hybrid drive, ie during the entire period between switching on and switching off the hybrid drive. This means that the electric machine essentially always provides a non-zero value electric machine operating variable. If, for example, the electric machine operating variable is the electric machine torque, then the electric machine supplies an electric machine torque during the entire operation of the hybrid drive. In other words, there is during the operation of the hybrid drive, possibly with the exception of the timing of the change between vibration reduction phases, no time at which only the internal combustion engine is operated, that is, even when choosing a pure internal combustion engine operation by the driver of the motor vehicle in the background yet always the electric machine supplies an amount of the electric machine operating quantity, for example, the electric machine torque.

Due to the constant provision of a positive or a negative electric machine operating variable, in particular a positive or a negative electric machine torque, in particular a force-transmitting connection between the electric machine and the internal combustion engine is always biased or loaded with a torque. If, for example, the electric machine supplies an electric machine torque to a shaft or axle or output connected to the crankshaft of the internal combustion engine, then this shaft is preloaded or loaded with torque by the constantly provided electric machine torque. The force-transmitting connection may also be a clutch or a transmission. By biasing the force transmitting connection or the output, the shaft, the clutch or the transmission noise, such as rattling or the like, can be reduced or avoided.

Further preferably, it may be provided that the operating value of the electric machine operating variable is determined such that a change of sign of the modulated electric machine operating variable is not perceived by a driver of the motor vehicle when changing between the vibration reduction phases, wherein in particular a load change of the electric machine by a driver of the motor vehicle is not perceived.

By an appropriate choice of the operating value can be ensured that a driver of a motor vehicle does not notice the change between the individual vibration reduction phases.

This improves the subjective driving feel for the motor vehicle driver and other vehicle occupants.

Further preferably, it may be provided that a state of charge of a battery is taken into account, wherein the operating value of the electric machine operating variable is selected to be positive or negative in order to take into account the state of charge.

If, for example, in a first oscillation reduction phase, the operating value of the electric machine operating variable is positive, for example the operating value of the electric machine torque, the battery of the hybrid drive is discharged during the first oscillation reduction phase. In a subsequent second vibration reduction phase, however, the operating value of the electric machine operating variable, in particular of the electric machine torque, is set negative. As a result, the battery of the hybrid drive is recharged, in particular drive energy of the internal combustion engine is converted into electrical power in a generator operation of the electric machine.

Furthermore, it can preferably be provided that the amplitude and the phase of the oscillation are determined on the basis of measured data of a sensor arranged on the motor vehicle, in particular on the hybrid drive, more particularly on the internal combustion engine, in particular a vibration sensor, and / or on the basis of a calculation in a computer become.

The sensor is preferably designed as a controller and may be, for example, a PID controller. With the controller, a constant speed or a constant torque of the hybrid drive or the output of the hybrid drive can be monitored and regulated. In the operation of an internal combustion engine, for example, the speed of the internal combustion engine is not absolutely constant, that is, the speed curve varies. By the controller, the electric machine speed or the electric machine torque of the Electric machine can be adjusted so that the total speed or the total torque of the hybrid drive is kept constant.

In principle, however, other control or manipulated variables are also conceivable for determining the operating value of the electric machine operating variable.

It can also be provided in principle that, alternatively or additionally, the amplitude and phase of the oscillation, or of the modulated frequency or of the modulated frequency spectrum, in particular by a computing device of the hybrid drive, are calculated.

In addition, sensors or regulators can be provided, with which other vibration or vibration sources are measured, so that the operating value of the electric machine operating variable is set to reduce these vibrations and vibrations. For example, the vibrations or vibrations of the vehicle body can be monitored and this vibration or vibration can be compensated via the controller or via a theoretical calculation by means of the electric machine.

Another solution of the problem underlying the invention consists in a hybrid drive, which is designed to carry out a method described above.

The hybrid drive preferably comprises an electric machine, an internal combustion engine and a computing unit. Furthermore, a battery and / or a regulator or a sensor can be provided.

Another solution of the problem underlying the invention is to provide a motor vehicle comprising a hybrid drive as described above.

list of figures

An embodiment of the invention will be explained below with reference to the drawings.

• 1 einen Hybridantrieb,
• 2 ein Flussdiagram für ein Verfahren zur Schwingungsreduktion in einem Hybridantrieb,
• 3 ein Wirkungsgradkennfeld einer Elektromaschine,
• 4 ein weiteres Wirkungsgradkennfeld einer Elektromaschine,
• 4a einen Zeitverlauf eines modulierten und lastpunktverschobenen Elektromaschinen-Drehmoments.
• 4b einen Zeitverlauf eines bekannten modulierten Elektromaschinen-Drehmoments, und
• 4c einen zweiten Zeitverlauf eines modulierten und lastpunktverschobenen Elektromaschinen-Drehmoments.

Show it

• 1 a hybrid drive,
• 2 a flow diagram for a method for vibration reduction in a hybrid drive,
• 3 an efficiency map of an electric machine,
• 4 another efficiency map of an electric machine,
• 4a a time course of a modulated and a load point shifted electric machine torque.
• 4b a time course of a known modulated electric machine torque, and
• 4c a second time course of a modulated and a load-shifted electrical machine torque.

Detailed description of the figures

1 shows a hybrid drive 100 to carry out a method for vibration reduction in a hybrid drive 100 , The hybrid drive 100 has an internal combustion engine 10 and an electric machine 11 on, wherein the electric machine 11 parallel to the internal combustion engine 10 is arranged and switched. The electric machine 11 is with a trained as a shaft output 12 the internal combustion engine 10 via a clutch 13 connected. One from the internal combustion engine 10 and / or the electric machine 11 Provided torque is transmitted via an axle drive 14 on a drive wheel 15 transfer. The internal combustion engine 10 also has a sensor 16 which acts as a regulator 17 is formed, which, for controlling a speed of the internal combustion engine 10 or the hybrid drive 100 is trained.

There is also a battery 18 provided for the operation of the electric machine 11 required electric power stores. By a generator function, the battery 18 from the electric machine 11 via an electrical converter 19 to be charged. Furthermore, the electric machine 11 be operated in a motor function, with electrical power from the battery 18 from the electric machine 11 into mechanical energy, that is drive energy, is implemented. Thus, the internal combustion engine 10 be operated at a lower power, so that the total fuel consumption of the hybrid drive 100 reduced and the carbon footprint is improved. Furthermore, the hybrid drive 100 an arithmetic unit 20 on which to control the hybrid drive 100 is trained.

2 shows a flowchart for the method for vibration reduction in a hybrid drive 100 for a motor vehicle. In a first vibration reduction phase 21 is an operating value of an electric machine operating variable, in particular an electric machine torque, selected so that the electric machine 11 operated in a favorable load range at an optimized efficiency. On the operating value of the electric machine operating variable is a vibration or a frequency or a Frequency spectrum modulated, wherein the amplitude of the oscillation is less than the amount of the operating value of the electric machine operating variable, so that the modulated electric machine operating variable during the at least one vibration reduction phase 21 in the present example is always positive.

Amplitude and / or frequency and / or phase of the oscillation or the frequency or the frequency spectrum can for example by the controller 17 and / or the arithmetic unit 20 be controlled or regulated. Dodges the regulator 17 measured torque of the hybrid drive 100 or the internal combustion engine 10 from a predetermined setpoint, it is controlled by the controller 17 and / or the arithmetic unit 20 a corresponding compensating electric machine torque from the electric machine 11 generated.

After performing the first vibration reduction phase 21 becomes a second vibration reduction phase 22 carried out. Was the electric machine operating size in the first vibration reduction phase 21 positive, it is in the second vibration reduction phase 22 negative. In the present example, the electric machine operating variable is the electric machine torque. However, the electric machine operating amount may also be the electric machine speed or the electric machine power. After carrying out the second vibration reduction phase 22 Optionally, the process may begin with the first vibration reduction phase 21 be carried out again.

In the 3 and 4 It is shown how the operating value of the electric machine operating amount during the vibration reduction phase or the vibration reduction phases is determined. 3 shows the first two quadrants Q1 and Q2 an efficiency map 23 an electric machine 11 , On the X-axis (abscissa) the electric machine speed is plotted in revolutions per minute, while on the Y-axis (ordinate) that of the electric machine 11 supplied electric machine torque is removed. In the upper quadrant positive torques are plotted, while the lower quadrant negative, that is opposite torques applies.

The level of electric machine torques and electric machine speeds represent possible operating points of the electric machine 11 Different operating points have different efficiencies. Operating points with an equal efficiency are by contour lines 24 connected with each other. According to the method, the operating value of the electric machine operating variable, in particular of the electric machine torque, is selected such that the electric machine 11 is operated in a load state with a particularly high efficiency. For example, this would be according to the efficiency map 23 of the 3 mean that the operating value at a speed x _{1 is set} to an electric machine torque y ₁ . This operating point is in 3 marked with a star. At the same time, an oscillation or a frequency or a frequency spectrum is modulated onto the operating value of the electric machine operating variable, in particular of the electric machine torque, in order to generate vibrations, in particular of the internal combustion engine 10 to compensate.

In the 4 are in the efficiency map shown there 23 a first area 25 and a second area 26 characterized for the electric machine torque, in which a particularly optimized efficiency for the operation of the electric machine 11 is achieved. In operation of the hybrid drive 100 is therefore in the first vibration reduction phase 21 an operating value of the electric machine torque to a positive value within the first range 25 set. At this operating value of the electric machine torque, a vibration is modulated. The time course of the modulated electric machine operating variable is in 4a shown. The amplitude of the modulated oscillation is chosen so that the modulated electric machine operating variable is always within the first range 25 lies. After a predetermined time t, preferably after 30 seconds, is for a second vibration reduction phase 22 a new, this time negative operating value of the electric machine operating size from the second area 26 set. Again, the amplitude of the modulated oscillation or frequency spectrum is chosen such that the modulated electric machine operating quantity is within the second range 26 located. A temporal evolution of the modulated electric machine torque during the second vibration reduction phase 22 is in 4c shown.

For comparison shows 4b the time course of the electric machine torque in a known from the prior art active Schwingungstilgungsverfahren without load point shift. In the method of the prior art, the electric machine operating variable, that is, for example, the electric machine torque is varied around a zero point, so that the electric machine torque has constantly recurring zero crossings. These recurring zero crossings cause load changes of the electric machine 11 , which can lead to noise or a poorer efficiency.

LIST OF REFERENCE NUMBERS

100

hybrid drive

10

Internal combustion engine

11

electric machine

12

output

13

clutch

14

transaxles

15

drive wheel

16

sensor

17

regulator

18

battery

19

Electric converter

20

computer unit

21

First vibration reduction phase

22

Second vibration reduction phase

23

Efficiency map

24

contour

25

First area

26

Second area

Q1

quadrant

Q2

quadrant

Q3

quadrant

Q4

quadrant

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 102006036217 A1 [0006]
• EP 2848485 A1 [0007]
• DE 102012203778 A1 [0008]

Claims (10)

A method for vibration reduction in a hybrid drive (100) for a motor vehicle, wherein the hybrid drive (100) comprises an electric machine (11) and an internal combustion engine (10), wherein in at least one vibration reduction phase (21, 22) an operating value of an electric machine operating variable, in particular an electric machine torque and / or an electric machine speed and / or an electric machine power, the electric machine (11) is modulated with a vibration, wherein the amplitude of the vibration is smaller than the amount of the operating value of the electric machine operating variable, so that the modulated electric machine operating variable during the at least one vibration reduction phase (21, 22) is always positive or negative. Method according to Claim 1 wherein the operating value of the electric machine operating variable is determined such that the electric machine (11) and / or the internal combustion engine (10) are operated in an operating state with an improved efficiency and / or an improved efficiency. Method according to Claim 1 or 2 , wherein during the at least one vibration reduction phase (21, 22) no load change of the electric machine (11) occurs. Method according to one of the preceding claims, wherein after a first oscillation reduction phase (21) with a positive or a negative operating value of the electric machine operating variable, a second oscillation reduction phase (22) is carried out with a negative or a positive operating value of the electric machine operating variable, wherein oscillation reduction phases ( 21, 22) having a positive operation value of the electric machine operation amount and vibration reduction phases (21, 22) alternate with a negative operation value of the electric machine operation amount. Method according to Claim 4 , Wherein a duration of the first and / or the second, in particular each, vibration reduction phase is selected as a function of a state of charge of a battery. Method according to one of the preceding claims, wherein the modulated electric machine operating variable during the operation of the hybrid drive (100) is substantially always positive or negative, wherein preferably the modulated electric machine operating variable is substantially always in a quadrant (Q1, Q2, Q3, Q4) an efficiency map (23) is held, wherein particularly preferably a force-transmitting connection, in particular a shaft, the electric machine (11) with the internal combustion engine (10) is biased and / or loaded substantially at any time of operation of the hybrid drive (100) , Method according to one of the preceding claims, wherein a state of charge of a battery (18) is taken into account, wherein for consideration of the state of charge, the operating value of the electric machine operating variable is selected to be positive or negative. Method according to one of the preceding claims, wherein the amplitude and the phase of the vibration on the basis of measured data of a on the motor vehicle, in particular the hybrid drive (100), further in particular on the internal combustion engine (10), arranged sensor (16), in particular a vibration sensor, and / or be determined on the basis of a calculation in a computing unit (20). Hybrid drive (100), designed to carry out a method according to one of Claims 1 to 8th , Motor vehicle comprising a hybrid drive (100) according to Claim 9 ,

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