DE102022204550A1 - Drive train for a motor vehicle - Google Patents

Abstract

Drive train (2) for a motor vehicle (1) with at least one electric machine (3) and a control device (4), which is designed to direct the electric machine (3) to generate a torque on an output, in particular at least one wheel (5 ), of the drive train (2), wherein the control device (4) is designed to control an acceleration behavior of the drive train (2) a torque generated by the electric machine (3) depending on at least one predefined drive profile, in particular a torque curve Internal combustion engine to control.

Description

The invention relates to a drive train for a motor vehicle with at least one electric machine and a control device which is designed to control the electric machine to generate a torque on an output, in particular at least one wheel, of the drive train.

Drive trains for motor vehicles, which have electric machines for generating a torque for driving the motor vehicle, i.e. ultimately provide at least one electric machine as a traction drive in order to move the motor vehicle, are basically known from the prior art. Here, the control device controls the electrical machine in such a way that a torque called up or requested by the user is provided by the electrical machine. The electrical machine is usually operated in such a way that a maximum available torque can be provided or the most efficient operation of the electrical machine can be achieved.

Due to the characteristic curve of the electric machine, in particular the torque curve over the speed, which is almost constant in the electric machine in a certain speed range, for example between 0 and 10,000 revolutions/min, the operation of the motor vehicle with the electric machine is perceived differently by users an operation of a motor vehicle with an internal combustion engine. Since the characteristic curve of the internal combustion engine, in particular the torque curve over the speed, is not constant as with the electric machine, but first has an increase and then a decrease over the speed, the driving experience for the user when driven by the electric machine is different when driven by the internal combustion engine.

Since the acceleration behavior of the electric machine hardly changes over a certain speed range, some users perceive this as unusual or possibly negative compared to the use of an internal combustion engine to generate the torque for driving the motor vehicle. In particular, the application of full torque can, under certain circumstances, cause an almost sudden acceleration development even at low speeds, which would possibly exceed the driver's abilities and lead to a higher risk of accidents, since acceleration processes of the motor vehicle are less well assessed or "experienced" in this case can.

The invention is based on the object of specifying an improved drive train for a motor vehicle.

The task is solved by a drive train with the features of claim 1. Advantageous refinements are the subject of the subclaims.

As described, the invention relates to a drive train for a motor vehicle, which has a control device and an electric machine, which electric machine is designed by the control device to generate a torque on an output of the motor vehicle or the drive train. The torque can in particular be transmitted to at least one wheel in order to drive the motor vehicle. The invention is based on the knowledge that the control device is designed to control an acceleration behavior of the drive train, a torque generated by the electric machine as a function of at least one predefined drive profile, in particular a torque curve of an internal combustion engine with a transmission, such as an automatic transmission, automated or manual Manual transmission to control.

The invention proposes defining a drive profile that describes a specific drive for a motor vehicle, for example a torque curve over the speed of a (specific) internal combustion engine. The torque curve described by the drive profile has, in particular, a rising edge, a peak and a falling edge. Based on the drive profile, the control device can control the acceleration behavior of the drive train and thus of the motor vehicle. In other words, the control device does not control the electric machine, as in normal operation, to generate a maximum torque or the maximum possible torque at the respective operating point via the speed of the electric machine, but rather an acceleration behavior is defined on the part of the drive profile, which is defined by the electrical machine is to be depicted.

The drive profile corresponds in particular to a torque curve of a (typical) vehicle with an internal combustion engine over the speed. In other words, the generation of the torque of the electric machine is changed by the control device in such a way that the electric machine The torque curve of the torque generated corresponds to the torque curve of a drive train with an internal combustion engine. The characteristic details of the torque curve of the internal combustion engine are determined via the predefined drive profile, for example an idle speed, the slope and course of the rising edge, the position of the apex and the slope and course of the falling edge, depending on the gear or the gear ratio of the gearbox. Instead of a usually constant torque curve over the speed, which can be provided by the electric machine, the control device changes the torque generated by the electric machine in such a way that the torque curve can be simulated over the speed of an internal combustion engine. The control device thus changes the torque characteristic of the electric machine in order to simulate the torque characteristics of an internal combustion engine.

When the drive train is operated in this way, users advantageously find the acceleration behavior to be more pleasant because it changes with the speed. In other words, the described control of the electric machine based on the predefined drive profile transforms the otherwise constant acceleration behavior into an acceleration behavior that increases over the speed and then decreases. When operating the drive train, the user is thus given a driving experience that can usually only be achieved in drive trains for motor vehicles with internal combustion engines.

The predefined drive profile can ultimately be adapted to a specific acceleration behavior so that a user can experience an acceleration behavior that they prefer. The change in the torque curve or the change in the characteristic curve of the electric machine can still remain proportional to the torque called up by the user, for example proportional to an accelerator pedal position, but the change in torque over the speed can be defined by the drive profile. In particular, a user can thus select or set a drive profile that can simulate an acceleration behavior of a specific drive, for example a driving experience known to the user from the past or a known engine profile or vehicle profile.

The control device can in particular be designed to adapt, in particular reduce, a predefined, in particular a maximum, torque characteristic of the electric machine to a torque characteristic to be emulated in order to emulate a defined motor characteristic depending on the drive profile. A torque characteristic is understood, in particular, to be the course of the delivered or deliverable torque over the speed of the electric machine. Instead of generating a constant torque curve over the increasing speed at a specific requested torque, the embodiment provides that a defined engine characteristic is regulated depending on the selected or set drive profile and thus a torque curve that is adapted to the constant curve. The torque characteristic of the electric machine, which is usually constant over a certain speed range, for example between 0 and 6000-10,000 revolutions/min, can thus be reduced in certain areas in order to have a torque curve that rises and falls before or after a peak, as is usually achieved by internal combustion engines will be replicated.

The drive profile can define a specific engine characteristic, which can be assigned to a specific existing engine type, for example. The engine type can, for example, refer to an engine that is currently or has been commercially offered in the past in a specific vehicle model from a specific manufacturer. Likewise, certain model-engine combinations can be replicated or created by combining existing engines and vehicles. In particular, the drive profile can replicate the engine characteristics of a specific vehicle of a specific brand.

The user can select the particular drive profile if the user wants to experience the driving experience that the user would experience while traveling in the particular motor vehicle. By adjusting the torque characteristic of the electric machine based on the drive profile, the selected motor characteristic is simulated, so that the drive train behaves in the same way as the specific motor vehicle or its engine being simulated in relation to the torque generated. For example, if the user of the motor vehicle wants to experience a driving experience that is familiar from the past, the drive profile can be used to simulate the engine characteristics of the electric machine and thus “simulate” or recreate the acceleration behavior that was achieved in the desired motor vehicle.

According to a further embodiment of the drive train, it can be provided that the control device has at least one memory device with at least two different ones assigned to saved drive profiles. This makes it possible to provide at least two different drive profiles, in particular any number of drive profiles, from which a user can select. Depending on which acceleration behavior is to be achieved by the drive train, the user can select the desired drive profile. For example, it is possible to use the drive profiles to represent several different vehicle-engine combinations that can be selected by the user. For example, different engine variants are available for a specific existing vehicle type, which can be selected by the respective drive profile, so that the drive train then behaves like the desired vehicle-engine combination in terms of its acceleration behavior. The specific vehicle-engine combinations can be loaded into or stored in the storage device. The drive profile can simulate the respective acceleration behavior or torque characteristics, in particular the course of the provided torque over the speed. Furthermore, any combinations of existing vehicle types with existing engine types can be formed.

The drive train described can be further developed in such a way that the drive profile defines at least one transmission characteristic. In addition or as an alternative to the described simulation of the torque characteristic on the part of the drive profile, it is also possible to simulate a characteristic of the transmission. For example, if the drive train itself does not have a switchable transmission or a transmission that has fewer switching stages than a transmission to be simulated, for example a transmission with only two switching stages, any other transmission can still be simulated by changing the torque characteristic. A wide variety of types of transmissions can be simulated, for example dual clutch transmissions, manual transmissions, automatic transmissions, automated manual transmissions and the like.

The drive profile can in particular replicate a specific model of an existing transmission, for example a specific previously commercially available eight-speed transmission. The respective switching points or speeds at which the transmission automatically carries out a switching process, for example in the context of an automatic transmission, can also be stored in the drive profile. Depending on the equipment of the drive train or the motor vehicle that has the drive train, a user input may be required to carry out a switching process, for example when replicating a manual switch, for example the actuation of an actuating element, in particular a switch button. The user can thus trigger the execution of the switching process by actuating the actuating element, so that a hand switch can also be simulated.

In combination, it is therefore possible to simulate the driving behavior or the acceleration behavior of a specific motor vehicle or a specific drive train configuration, since on the one hand the acceleration behavior is possible based on the change in the torque characteristic of the electric machine. On the other hand, by mapping the transmission characteristics, certain switching operations that the transmission of the motor vehicle to be simulated provides can also be simulated, so that ultimately the overall driving behavior can be simulated. The switching processes described can be reproduced using the torque characteristic. For this purpose, the torque can be reduced during the switching process to be carried out or a switching process has been carried out and thereby a "torque drop" can be simulated and accordingly after the "simulated" switching process has been carried out, the torque characteristic can be at a different level, in particular when switching to a higher gear and lower at a Shifting to a lower gear with a higher torque value than before the shifting process can be continued.

A further development of the drive train described can provide that the control device is designed to scale a torque to be simulated, in particular a torque curve to be simulated, based on the maximum torque that can be provided. In special cases in which the maximum torque that can be provided by the electric machine of the drive train is not sufficient to set a maximum torque of a motor to be simulated, scaling can be carried out based on the maximum torque that can be provided so that the torque curve is maintained, but the individual ones The torques set at the specific speeds can be reduced by the same factor as the maximum torque that can be provided was reduced to the maximum torque of the drive to be simulated. Other scaling factors are also possible for the individual torques provided at the respective speeds. The procedure described can, for example, be selected for only one gear or for one gear stage, for example for first gear, since the highest torques are usually set here. It is also possible to carry out the selected scaling for all or several gears.

The drive train described can further be developed in such a way that the control device is designed to carry out a switching process of a transmission device of the drive train depending on the torque curve to be simulated, in particular depending on at least one switching process to be simulated. As described, switching processes of a transmission to be simulated can be simulated by changing the torque characteristic or the acceleration behavior of the electric machine. If the drive train itself also has a transmission device, for example a two-speed transmission, switching operations of the transmission device of the drive train can be carried out depending on the torque curve to be simulated.

This means in particular that a switching process that is required anyway can be superimposed on a switching process that is to be simulated. It is also possible to “hide” switching operations that have been carried out, for example by torque support by the electric machine or another electric machine, so that they do not disturb the torque curve to be simulated. This means, in particular, that the switching operations carried out are either used as real switching operations that would have had to be recreated anyway, or that they are carried out in such a way that the user cannot perceive them and can sense the torque curve to be recreated in accordance with the selected drive profile.

The control device can further be designed to control the acceleration behavior, in particular in a starting phase, based on starting element information, in particular converter information, or converter characteristics. The selected drive profile can contain information about the starting element. The starting element is understood to mean, for example, clutch devices or torque converters that are installed in the motor vehicle to be simulated. Depending on what type of clutch device or torque converter or general starting element is to be provided in the selected motor vehicle or engine-transmission combination, the acceleration behavior of the drive train can be controlled based on the starting element information, particularly in a starting phase, by changing the torque characteristic of the electric machine become. In other words, the torque characteristic of the electric machine is changed by the control device in such a way that the acceleration behavior in the starting phase corresponds to the starting behavior that would be realized by using such a starting element.

Although the powertrain does not include the starting element itself, it feels to the user as if the starting process is carried out using such a starting element.

According to a further embodiment of the drive train, it can be provided that the control device is designed to set and/or change a relationship between a torque request, in particular an accelerator pedal position, and a control of the electric machine to generate a torque, depending on the drive profile. As described, in principle the connection between the accelerator pedal position selected by the user and the generation of torque can be maintained. However, according to the embodiment described, a change, for example a deviation, can also occur in a direct relationship between the accelerator pedal position and torque generation. For example, a motor vehicle can be modeled in which an accelerator pedal position and a flap opening are not linearly related. For this purpose, the corresponding relationship can be defined by the drive profile and set by the control device.

The drive profile can further comprise at least one piece of vehicle information, in particular information describing a physical property, for example a vehicle mass and/or a drag coefficient, of a motor vehicle to be simulated, the control thereof being designed to determine the acceleration behavior based on at least one difference in the vehicle information of the vehicle to control the motor vehicle to be simulated and vehicle information of the motor vehicle having the drive train. As described, the driving behavior or acceleration behavior of an existing motor vehicle to be replicated should, if possible, be replicated by the ego motor vehicle that has the drive train described herein.

According to the described embodiment, the control device can include vehicle information from the vehicle to be simulated via the drive profile. In particular, differences between the motor vehicle to be replicated and the current motor vehicle can be taken into account. If the motor vehicle to be simulated differs significantly from the motor vehicle that has the drive train, for example in terms of its vehicle mass and/or its drag coefficient, such vehicle information must be taken into account in order to determine the general acceleration to be able to reproduce the behavior correctly. In other words, in addition to the acceleration behavior on the part of the torque characteristic of the electric machine, the deviations in the vehicle types or the vehicle characteristics that are described by the vehicle information can also be taken into account. Deviations in the vehicle mass can thus be compensated for by increasing or reducing the set torque, so that ultimately the acceleration behavior of the motor vehicle to be simulated can be reproduced exactly.

According to a further embodiment of the drive train, it can be provided that the drive profile has at least one piece of chassis information, wherein the control device is designed to control at least one parameter of a chassis device of the drive train based on the chassis information. As described, a specific motor vehicle can be modeled using the drive profile. In addition to the drive device, in particular the internal combustion engine, and the transmission device described above, it is also possible to simulate the behavior of the chassis of the motor vehicle to be simulated. In terms of chassis information, the selected drive profile describes how the chassis or chassis device of the motor vehicle to be simulated behaves. In particular, spring hardness or spring travel and the like can be adjusted. As a result, the behavior of the motor vehicle to be simulated is further improved for the user or the user can achieve an improvement in the simulation of the motor vehicle to be simulated in a further direction of perception.

The drive profile can further have at least one piece of acoustic information, wherein the control device is designed to control at least one audio output device based on the acoustic information. The acoustic information can, for example, include certain sound data that relate to the sound of the drive device to be simulated. The acoustic information can also include chassis noises, transmission noises, for example when switching operations are carried out, and the like, in order to be able to reproduce the motor vehicle to be simulated as realistically as possible. Furthermore, the acoustic information can take into account differences in the insulation of the motor vehicle to be simulated in relation to the current motor vehicle, so that, for example, external noises can be dampened to a lesser extent or can be directed into the interior in a targeted manner by the audio output device, for example to simulate an old motor vehicle, that does not have less sophisticated insulation or damping than a current motor vehicle that has the drive train described herein.

According to a further embodiment of the drive train, the drive profile can have at least one piece of instrument information, wherein the control device is designed to control at least one instrument device, in particular a digital visual output device, based on the instrument information. The digital visual output device can be arranged in particular in the area of a dashboard of the motor vehicle that has the drive train described herein. The digital visual output device can, for example, display instruments such as those present in the motor vehicle to be simulated based on the instrument information. For example, the design or configuration of a speedometer, tachometer, fuel gauge and the like to be simulated can be depicted so that the instruments displayed for the user correspond to those of the motor vehicle to be simulated.

According to a further embodiment, the control device can be coupled or coupled to a database providing a plurality of drive profiles, the control device being designed to retrieve at least one drive profile from the database. The database described can, for example, include a variety of vehicle types, such as off-road vehicles, sports cars, sedans, coupes, station wagons, vans and the like. It is also possible for the database to contain actually existing motor vehicles that can be loaded into the control device. For example, the user can select which drive profile should be loaded from the database in order to be able to implement the drive profile in the current drive train by the control device. For example, the user can select a specific brand or manufacturer, for example “Volkswagen”. The user can also select a specific vehicle model, for example “Beetle”. Furthermore, the user can define the engine type, for example 50 HP 1.6L, the transmission device, for example 4-speed manual switch, and other previously described data of the motor vehicle to be simulated. Accordingly, a drive profile can be loaded or created. There is also the possibility of creating new combinations, for example combining a specific vehicle model with an engine type that was not commercially available in this combination. The user can put together the necessary devices for this purpose, so that a drive profile describing the combination is generated, in particular by the control device.

In addition to the drive train described, the invention relates to a control device for such a drive train. The invention further relates to a motor vehicle comprising such a control device and/or a previously described drive train. The invention further relates to a method for controlling operation of a drive train for a motor vehicle with at least one electric machine and a control device which is designed to control the electric machine to generate a torque on an output, in particular at least one wheel, of the drive train, wherein, in order to control an acceleration behavior of the drive train, a torque generated by the electric machine is controlled as a function of at least one predefined drive profile, in particular a torque curve of an internal combustion engine.

All advantages, details and features that have been described in relation to the drive train are fully transferable to the control device, the motor vehicle and the method.

• 1 ein Kraftfahrzeug, umfassend einen Antriebsstrang, eine elektrische Maschine und eine Steuerungseinrichtung;
• 2 eine beispielhafte Drehmomentkennlinie nach einem ersten Ausführungsbeispiel;
• 3 eine beispielhafte Drehmomentkennlinie nach einem zweiten Ausführungsbeispiel; und
• 4 eine beispielhafte Drehmomentkennlinie nach einem dritten Ausführungsbeispiel.

The invention is explained below using exemplary embodiments with reference to the figures. The figures are schematic representations and show:

• 1 a motor vehicle comprising a drive train, an electric machine and a control device;
• 2 an exemplary torque characteristic according to a first exemplary embodiment;
• 3 an exemplary torque characteristic according to a second exemplary embodiment; and
• 4 an exemplary torque characteristic according to a third exemplary embodiment.

1 shows a motor vehicle 1 with a drive train 2, which has an electric machine 3 and a control device 4. The control device 4 is basically designed to control the electrical machine 3, that is, to supply the electrical machine 3 with corresponding control signals which cause the electrical machine 3 to generate a torque, which torque is used to drive the motor vehicle 1. The torque can be transmitted to at least one drivable wheel 5 of the motor vehicle 1, for example via an optional transmission device 6, for example a switchable two-stage transmission. As described, the transmission device 6 is merely optional and can be exchanged for any other transmission.

The control device 4 is designed to control the acceleration behavior of the drive train 2. For this purpose, the control device can control the torque generated by the electric machine 3 depending on at least one predefined drive profile. The drive profile can in particular describe a torque curve of an internal combustion engine. The drive profile describes, for example, a typical torque curve of a combustion engine over the speed of the crankshaft. The drive profile can be predefined in such a way that a specific engine, for example the engine of a specific vehicle type of a specific vehicle brand or a specific vehicle manufacturer, is described. The simulation of the torque curve is based on the following 2-4 described. In addition to controlling the acceleration curve of the drive train 2, the electric machine 3 can control other devices of the motor vehicle 1 based on the drive profile in order to further improve a simulation of the motor vehicle to be simulated.

For example, the control device 4 can control a chassis device 7 of the motor vehicle 1 based on chassis information in the drive profile in order to simulate a specific chassis behavior of a motor vehicle to be simulated with the chassis device 7 of the motor vehicle 1 or the drive train 2. Furthermore, the control device 4 can control an audio output device 8 in order to produce a specific audio output based on the drive profile, as is typical for a motor vehicle to be simulated, for example relating to a characteristic sound of the engine to be simulated, an insulation behavior or a transmission behavior.

The control device 4 can further be coupled to a digital visual instrument device 9 and can control the instrument device 9 based on instrument information, which can be part of the drive profile. The instrument device 9 can then, for example, display instruments or displays that are present in a motor vehicle to be simulated. In particular, the design, the arrangement and the like can be adopted so that the motor vehicle 1 can display on its instrument device 9 the same instruments in the same shape that are present in the motor vehicle to be replicated.

For this purpose, the control device 4 can be coupled to a memory device 10 in which the at least one drive profile is stored. The storage device can also have a variety store drive profiles, which can include, for example, different engines, vehicle types or engine-transmission combinations and the like. In principle, a drive profile can be generated for any vehicle, for example with a defined engine, a defined transmission and a defined chassis. By storing the respective drive profile in the storage device 10, this can be implemented by the control device 4 on the drive train 2 or the motor vehicle 1.

The drive profile can further have vehicle information about the motor vehicle to be simulated, in particular relating to at least one physical property, for example its vehicle mass and/or its drag coefficient. When controlling the generation of torque by the electric machine 3, the vehicle information can be taken into account by the control device 4, so that the overall acceleration behavior of the motor vehicle 1 can be adapted even more precisely to the acceleration behavior of the motor vehicle to be simulated. Furthermore, influences on the inertia or braking behavior can be taken into account and, in general, especially when the chassis device 7 is controlled, the complete driving behavior of the motor vehicle to be simulated can be simulated.

The control device 4 can be connected, in particular wirelessly, to a database 20 from which further drive profiles, for example any number of drive profiles for different vehicles, engines, transmission devices, chassis devices and any combination thereof, can be stored. The control device 4 can load a desired drive profile from the database 20; for example, a user of the motor vehicle 1 can select and activate the respective drive profile. The drive profile can then be loaded from the database 20 into the storage device 10 and accessed from there by the control device 4.

In addition to the devices shown, the control device 4 can control other devices of the motor vehicle 1. The facilities shown are only to be understood as examples. In particular, further elements of the drive train 2 arranged in the torque flow can be simulated by the control device 4 by adapting the torque curve of the electric machine 3 accordingly. Another example of such transmission elements can be a starting element, which is designed, for example, as a starting clutch or torque converter. Even if the drive train 2 does not have such a transmission element, by changing the torque position on the part of the electric machine 3, the delivered torque or its course and thus the acceleration behavior of the motor vehicle 1 can be adjusted as if such a transmission element were provided in the drive train 2 and on involved in torque transmission. The information regarding such a gear element can be provided together with the drive profile. For example, starting element information can indicate which starting element the motor vehicle to be simulated has.

2 shows only schematically a diagram of a torque curve over a speed. The values can ultimately be selected or changed as desired and depend on the specific electrical machine 3 used or the specific motor vehicle to be modeled or its drive device. To illustrate the method described herein, a curve 11 is shown, which represents a (typical) behavior of an electrical machine 3, in particular the electrical machine 3 of the drive train 2 of the motor vehicle 1. As shown, in a certain speed range, for example between 0 and 6-10,000 revolutions/min, there is an almost constant course of the torque over the speed. Since such acceleration behavior can be perceived as disturbing by users of the motor vehicle 1, the control device 4 can adapt the torque curve. Curve 12 shows a torque curve over the speed of an engine to be simulated, in particular an internal combustion engine, for example a specific gasoline engine. In addition to the gasoline engine, any other design of the internal combustion engine is possible, for example a diesel engine. For the sake of simplicity, in the diagram shown, the maximum torque to be provided by the motor to be simulated is equal to the maximum torque that can be provided by the electric machine 3. In other words, the apex of curve 12 is on curve 11.

The maximum torque provided by the engine to be simulated is reached at a certain speed at the apex of the torque characteristic of the internal combustion engine. As can be seen, as shown by arrows, the torque characteristic of the electric machine 3 is adjusted by the control device 4 in the remaining speed ranges, in particular the torque provided at the respective speed is reduced in order to simulate the torque characteristic of the internal combustion engine and thus the acceleration behavior of the motor vehicle 1 to that of one force to be replicated vehicle that would have the internal combustion engine is modeled. The behavior realized based on the drive profile, in particular the torque characteristic, which is exemplified by curve 12, is characterized by slopes falling from the apex. In other words, the torque characteristic curve according to curve 12 has a rising edge and a falling edge, which are connected to one another at the apex.

During operation of the motor vehicle 1 or the drive train 2, the torque position on the part of the electric machine 3 is based on the curve 12, so that the user of the motor vehicle 1 feels the acceleration behavior of the motor vehicle to be simulated.

In 3 is a too 2 A similar diagram is shown, with a dashed curve 13 being shown, which describes a torque curve of a motor to be simulated. It can be seen that the maximum torque that can be provided by the engine to be simulated cannot be set at the apex of the curve 13 by the electric machine 3 of the drive train 2 of the motor vehicle 1, since this is above the maximum torque of the electric machine 3. In this case, the control device 4 can carry out scaling so that the maximum torque of the motor to be simulated is limited to the maximum torque of the electric machine 3 (see arrow). It can also be taken into account here that the electric machine 3 is designed to increase the torque for a short time as part of a boost function.

The scaling can follow the speed for the remaining torques or the remaining torque curve, so that the entire torque curve according to curve 13 is scaled by the same factor as the maximum torque. Accordingly, the torque curve according to curve 12 can be generated from the torque curve according to curve 13, which can be set by the electric machine 3, as previously referred to 2 was described. The scaling described can, for example, be carried out only for one gear, in particular the first gear, which can usually provide the highest torque, or can be carried out over the entire operating range of the drive train 2. If there is a reverse situation in which the torque curve to be simulated with its maximum torque is below the maximum torque that can be provided by the electric machine 3, the torque curve can either be simulated as required or scaling “upwards” can also be carried out so that the Torques of the torque curve to be simulated are increased in order to exploit the maximum potential of the electrical machine 3.

In 4 Various torque curves are shown according to curves 14-19, which simulate operation in six different speed levels or gear steps. The control device 4 can control the torque generation by the electric machine 3 according to the resulting torque curve, so that switching processes can be simulated. Even if the drive train 2 does not have a transmission device, the switching processes can still be simulated by corresponding torque drops. For this purpose, the electric machine 3 can be operated according to curve 14 until the torque drops. The switching process can be triggered automatically or manually, for example by the user actuating an actuating element, and after a drop in torque the torque curve can be continued according to curve 15.

Accordingly, you can drive in the individual gear levels shown by curves 14-19 by selecting, manually or automatically. As is usual in a drive train with a combustion engine, the maximum torque is reduced depending on the selected gear level. If the drive train 2 has a transmission device 6, which comprises, for example, two gear stages, the change of the gear stage can be accommodated in a simulated switching process depending on the operating situation, i.e. that the change of the gear stage is carried out when the control device 4 is the electric machine 3 anyway to simulate a switching process. If the drive train 2 has several electric machines 3 or if the electric machine 3 can be used to support the torque, the switching process can also be carried out in another way, as long as the torque curve, which is shown by the curves 14-19, is not affected.

The advantages, details and features shown in the individual exemplary embodiments can be combined with one another in any way, interchangeable with one another and transferable to one another. The method described herein can be carried out on the motor vehicle 1 with the drive train 2. The control device 4 is designed in particular to carry out the method described.

Reference symbols

1

motor vehicle

2

Drivetrain

3

electric machine

4

Control device

5

wheel

6

Transmission device

7

Chassis equipment

8th

Audio output facility

9

Instrument setup

10

Storage facility

11 - 19

Curve

20

Database

Claims (16)

Drive train (2) for a motor vehicle (1) with at least one electric machine (3) and a control device (4), which is designed to direct the electric machine (3) to generate a torque on an output, in particular at least one wheel (5 ), of the drive train (2), characterized in that the control device (4) is designed to control an acceleration behavior of the drive train (2) a torque generated by the electric machine (3) depending on at least one predefined drive profile, in particular a torque curve of an internal combustion engine. Drive train (2). Claim 1 , characterized in that the control device (4) is designed to adapt, in particular reduce, a predefined, in particular a maximum, torque characteristic of the electric machine (3) to a torque characteristic to be emulated in order to emulate a defined motor characteristic depending on the drive profile. Drive train (2). Claim 1 or 2 , characterized in that the control device (4) is assigned at least one memory device (10) with at least two different stored drive profiles. Drive train (2) according to one of the preceding claims, characterized in that the drive profile defines at least one transmission characteristic. Drive train (2) according to one of the preceding claims, characterized in that the control device (4) is designed to scale a torque to be simulated, in particular a torque curve to be simulated, based on the maximum torque that can be provided. Drive train (2) according to one of the preceding claims, characterized in that the control device (4) is designed to carry out a switching process of a transmission device of the drive train (2) depending on the torque curve to be simulated, in particular depending on at least one switching process to be simulated. Drive train (2) according to one of the preceding claims, characterized in that the control device (4) is designed to control the acceleration behavior, in particular in a starting phase, based on starting element information, in particular a converter characteristic. Drive train (2) according to one of the preceding claims, characterized in that the control device (4) is designed, depending on the drive profile, to establish a relationship between a torque requirement, in particular an accelerator pedal position, and a control of the electric machine (3) to generate a torque to adjust and/or change. Drive train (2) according to one of the preceding claims, characterized in that the drive profile comprises at least one piece of vehicle information, in particular a vehicle mass and/or a drag coefficient, of a motor vehicle (1) to be simulated, the control device (4) being designed to do so To control acceleration behavior based on at least one difference in the vehicle information of the motor vehicle (1) to be simulated and vehicle information of the motor vehicle (1) having the drive train (2). Drive train (2) according to one of the preceding claims, characterized in that the drive profile has at least one chassis information item, wherein the control device (4) is designed to control at least one parameter of a chassis device (7) of the drive train (2) based on the chassis information . Drive train (2) according to one of the preceding claims, characterized in that the drive profile has at least one piece of acoustic information, the control device (4) being designed to control at least one audio output device (8) based on the acoustic information. Drive train (2) according to one of the preceding claims, characterized in that the drive profile has at least one piece of instrument information, wherein the control device (4) is designed to control at least one instrument device (9), in particular a digital visual output device, based on the instrument information. Drive train (2) according to one of the preceding claims, characterized in that the control device (4) can be coupled or coupled to a database (20) providing a plurality of drive profiles, the control device (4) being designed to read from the database (20 ) to retrieve at least one drive profile. Control device (4) for a drive train (2) according to one of the preceding claims. Motor vehicle (1), comprising a drive train (2) according to one of Claims 1 until 13 and/or a control device (4) according to the preceding claim. Method for controlling operation of a drive train (2) for a motor vehicle (1) with at least one electric machine (3) and a control device (4) which is designed to apply the electric machine (3) to an output to generate a torque, in particular to control at least one wheel of the drive train (2), characterized in that in order to control an acceleration behavior of the drive train (2), a torque generated by the electric machine (3) is controlled as a function of at least one predefined drive profile, in particular a torque curve of an internal combustion engine becomes.

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