Method for determining a maximum value of a parameter range of a driving operation parameter of a vehicle and vehicle

Abstract

The invention relates to a method for determining a maximum value of a parameter range of a driving operating parameter of a vehicle (1), wherein the vehicle (1) comprises a control device (2), at least one electric traction motor (3), an electric energy storage device (5) operable in an operating temperature range for operating the traction motor (3), and at least one temperature sensor (6) for determining the temperature of the energy storage device (5), wherein the control device determines the maximum value based on the current temperature of the energy storage device (5) determined by the temperature sensor, so that after driving to a destination known to the control device (2) with driving operating parameters limited by the maximum value of the parameter range and / or after driving a preset distance, the temperature of the energy storage device (5) is predicted to be within a charging temperature range, wherein the charging temperature range is a subrange of the operating temperature range and includes at least one temperature with a maximum value of the charging power for charging the energy storage device (5).

Description

Technical Field

[0001] The invention relates to a method for determining a maximum value of a parameter range of a driving operating parameter of a vehicle, wherein the vehicle comprises a control device, at least one traction motor, an electrical energy storage device operable in an operating temperature range for operating the traction motor, and at least one temperature sensor for determining the temperature of the energy storage device. The invention also relates to a vehicle. Background Art

[0002] Vehicles driven by electric traction motors usually have an energy accumulator in which electrical energy is stored for operating the traction motors. The energy stored in the energy accumulator results in a range of the vehicle, which indicates how far the vehicle can be moved by the electric traction motors. For journeys whose total length exceeds this range, it is known to plan a travel route with charging possibilities along the way. For this purpose, the driver of the vehicle can, for example, enter his destination in the vehicle, wherein the driver then determines, for example, a list of recommended locations where the vehicle can be charged during the journey.

[0003] In order to influence the cruising range, it is known to reduce the energy consumption of the vehicle by limiting operating parameters, in particular operating parameters of the electric traction motor. This can increase the cruising range of the vehicle so that longer distances can be traveled before a charging process is necessary. For this purpose, various methods for operating electrically driven vehicles are known from the prior art.

[0004] Patent document DE 10 2009 052 853 A1 describes a method for estimating the cruising range of a vehicle. Here, the energy that is carried and can be determined in the vehicle is taken into account, wherein the driver can limit the maximum permissible driving speed and / or the maximum permissible acceleration and / or the maximum power for the comfort system. Based on these limits and the road conditions around the vehicle and the energy still available, the currently possible cruising range is calculated and displayed by a computing device.

[0005] A drive power control system for a vehicle including an electric motor and a battery is known from patent document US 2020 / 0139986 A1. The drive power control system includes a control unit that determines an upper limit of acceleration for the vehicle based on the maximum power that can be output by the accumulator to the electric motor. When the upper limit of acceleration is lower than the target acceleration, a modified acceleration change can be used by a controller instead of a reference acceleration change.

[0006] Patent document US 2020 / 0047629 A1 describes a method for optimizing a journey with an electrically driven vehicle. Here, when the state of charge of the energy storage device is below a predetermined state of charge, a speed range is determined in a mode for energy saving in which the energy stored in the energy storage device can still be used to reach a predetermined destination. If the destination is not the desired destination, the vehicle is driven to a charging station with the energy still available in the energy storage device. Summary of the invention

[0007] The object of the present invention is to specify an improved method for determining a maximum value of a parameter range for a driving operating parameter of a vehicle, which method in particular allows a more efficient operation of the vehicle.

[0008] To achieve this object, in a method of the type described at the outset, it is provided according to the invention that a control device determines a maximum value as a function of a current temperature of the energy store determined by a temperature sensor, such that a predicted energy store temperature after driving to a destination known to the control device with driving operating parameters limited by a maximum value of a parameter range and / or after driving a preset distance is within a charging temperature range, wherein the charging temperature range is a subrange of the operating temperature range and includes at least one temperature having a maximum value for a charging power for charging the energy store.

[0009] The method ensures that after driving to the destination and / or after traveling a preset distance, the temperature of the energy storage device is within the charging temperature range, so that the energy storage device can be charged at the destination or after traveling a preset distance with an energy storage device temperature suitable for the charging process. In this case, the duration of the charging process is determined by the power used to transfer electrical energy from the charging station to the electrical energy storage device and by the total energy transferred for charging the energy storage device. In addition, the time required for charging the energy storage device is also dependent on the energy storage device temperature during charging, since the charging temperature has a significant influence on the maximum possible charging power that can be used to charge the energy storage device.

[0010] Advantageously, the method can avoid having to carry out a charging process at an unsuitable battery temperature, which, although it is a permissible operating temperature of the energy storage device, may lead to a longer charging time due to a temperature-induced reduction in the charging power of the energy storage device. For example, it is possible that the operating temperature range of an energy storage device designed as a traction battery is between -10°C and 65°C, whereas for a battery, the charging temperature range in which charging is carried out at a higher power is, for example, between 10°C and 50°C or between 10°C and 60°C. It is possible that the charging temperature range has the same lower limit as the operating temperature range, wherein the upper limit of the charging temperature range is lower than the upper limit of the operating temperature range. In order to predict the temperature of the energy storage device at the destination or after driving a predetermined distance, a calculation rule and / or a model of the vehicle for predicting the temperature of the energy storage device as a function of at least one driving operating parameter can be stored in the control device.

[0011] By charging the energy storage device with a higher charging power, charging can be performed more quickly at the destination or after a preset distance has been travelled. In this way, for example, in a journey that includes at least one stopover for charging the energy storage device, the total duration of the journey to the destination can be advantageously shortened by charging with a higher power and thus in a shorter time period. In charging processes between a plurality of individual journeys, it is also desirable that the charging duration for charging the energy storage device is as short as possible, for example if the driver subsequently plans another journey with the vehicle after only a short stop.

[0012] For example, a destination at which the temperature of the energy storage device is in the charging temperature range can be entered by the user into the control device or a navigation device connected to the control device, so that the control device knows which destination to drive to. The destination can be the end of a journey or a trip. It is also possible to use a stopover point, in particular a charging stop, of a longer journey as the destination.

[0013] During vehicle travel, in particular during longer vehicle journeys, the battery temperature is primarily dependent on the driver's driving behavior. Complying with the maximum values ​​of the parameter ranges of the driving operating parameters ensures that the energy storage device is not heated during vehicle travel so that the energy storage device has an unsuitable temperature for charging at the destination or after a preset mileage. In particular, by complying with the determined maximum values, it is possible to avoid traveling the driving distance with the maximum possible motor power of the traction motor directly before reaching the destination and / or before the end of the preset mileage, whereby the energy storage device may be heated to the maximum extent due to the high power flow. In this way, it is possible to avoid unsuitable heating of the energy storage device before reaching the destination or after traveling a preset mileage, so that a temperature that is favorable for charging within the charging temperature range is already provided at the beginning of the charging process. In this way, it is also possible to advantageously save the need to cool the energy storage device to a temperature within the charging temperature range before charging, which also requires a relatively long time due to the high thermal mass of the energy storage device.

[0014] The control device can achieve compliance with the maximum value by limiting the parameter range of the driving operating parameter to the maximum value, so that the driver can only drive the vehicle within the parameter range of the driving operating parameter limited by the maximum value. Alternatively, the driver can be informed of the determined maximum value, wherein the driver is prompted to comply with the parameter range of the driving operating parameter limited by the maximum value.

[0015] The at least one temperature sensor for determining the temperature of the energy storage device is in particular a temperature sensor which measures the temperature of a battery module of the energy storage device, which comprises one or more battery cells. In particular, temperatures or cell module temperatures measured by a plurality of temperature sensors, each of which is associated with different battery modules of the energy storage device, can also be taken into account when determining the maximum value.

[0016] According to the invention, it can be provided that the speed of the vehicle and / or the acceleration of the vehicle are used as driving operating parameters. In particular, driving at high speeds or requiring high vehicle accelerations leads to a high electrical power flow from the energy accumulator and thus to a strong heating of the energy accumulator. The permissible parameter range for the speed and / or acceleration of the vehicle can be limited by the maximum value of the parameter range determined by the control device. Thus, the maximum permissible vehicle speed and / or the maximum permissible vehicle acceleration is reduced by the determined maximum value, so that the respectively available parameter range has a lower upper limit than in an unrestricted operating state.

[0017] In a preferred embodiment of the invention, it can be provided that the control device determines a maximum value when at least one trigger criterion, which is monitored in particular by the control device, is met. The use of the trigger criterion advantageously makes it possible to make the limitation of the parameter range by the maximum value determined by the control device dependent on the fulfillment of the trigger criterion, i.e., the presence of a predefined prerequisite. This makes it possible to limit the parameter range only when a limitation is required in order to achieve a temperature within the charging temperature range at the destination or after driving a predefined mileage. This advantageously makes it possible to dispense with unnecessary limitation of parameter ranges that influence the driving capability of the vehicle.

[0018] According to the invention, it can be provided that the distance between the current vehicle position and the destination to be driven to is used as the or one trigger criterion, wherein the trigger criterion is met when the distance is less than a distance limit value. Thus, when the distance between the current vehicle position and the destination to be driven to is less than a preset distance limit value, the parameter range is limited by a maximum value determined by the control device. In this case, the current vehicle position can be determined, for example, by the control device or a navigation device connected to the control device. For example, a distance in the interval between 10 km and 100 km, in particular a distance of 50 km, can be used as a distance limit value.

[0019] In a preferred embodiment of the present invention, it can be provided that the remaining cruising range obtained from the charge state of the energy storage device is used as the or a triggering criterion, wherein the triggering criterion is met when the remaining cruising range is less than the cruising range limit value. When the remaining cruising range obtained from the charge state of the energy storage device is less than the cruising range limit value, it can also be foreseen that the vehicle charging process must be carried out at the latest after a distance corresponding to the remaining cruising range has been traveled. Thus, when the available remaining cruising range is less than the cruising range limit value, the control device limits the parameter range by determining a maximum value, so that the cruising range limit value is selected according to the remaining cruising range, but at least after a distance corresponding to the entire remaining cruising range has been traveled as a predetermined distance, an energy storage device temperature within the charging temperature range can be achieved. For example, a remaining cruising range in the interval between 10 km and 100 km, in particular a remaining cruising range of 50 km, can be used as the remaining cruising range limit value.

[0020] According to the invention, it can be provided that the vehicle has a display device for displaying information to the driver, wherein after the maximum value is determined, the limitation of the driving operating parameter and / or the operating information showing the maximum value is displayed on the display device. In this way, the driver of the vehicle can be made aware that the maximum value determined for the driving operating parameter, in particular the speed and / or acceleration of the vehicle, should no longer be exceeded in order to charge as efficiently as possible at the destination and / or after a preset distance. Thus, the driver of the vehicle can be made aware by the display of the operating information that a driving operating parameter limitation has been made, or the maximum value is displayed to the driver by the operating information, so that the driver can decide for himself whether the driver wants to limit the parameter range of the driving operating parameter to the maximum value in order to continue driving.

[0021] When speed is used as a driving operating parameter, it can be provided according to the invention that the operating information is displayed only if the maximum value is below a value for the driving operating parameter permitted for the current position of the vehicle. In this way, it is possible to avoid displaying a maximum value for the speed that is greater than a speed limit applicable to the current position of the vehicle. The permitted value for the driving operating parameter, in particular the maximum permitted speed for the vehicle, can be determined, for example, by environmental determination using environmental sensors of the vehicle and / or by map data stored in the control device or in a navigation device connected to the control device.

[0022] According to the invention, it can be provided that the displayed operating information includes the predicted charging time determined by the control device and / or the charging time difference determined by the control device between the charging time at a predicted temperature within the charging temperature range and the charging time at a maximum permissible energy storage temperature, in particular outside the charging temperature range. In this way, the driver of the vehicle can be made aware of how long the subsequent charging process will take at the destination and / or after a preset distance when driving within a restricted parameter range of the driving operating parameters. This makes it possible, for example, to provide the driver with further information on a favorable driving style and the duration or time saving of the subsequent charging process in addition to indicating the remaining available cruising range.

[0023] Furthermore, alternatively or additionally, it can also be displayed what time savings, i.e. what charging duration differences, are achieved when the distance to the destination or the preset mileage is covered with a parameter range of the driving operating parameter limited by the maximum value determined by the control device. The driver can thus be made aware that driving to the destination and / or covering the preset mileage at a reduced speed and / or reduced acceleration results in time savings during the subsequent charging process. The charging duration and the charging duration differences can relate to the complete charging of the energy storage device or, in particular, the partial charging of the energy storage device which can be performed at a high charging power, for example, charging the energy storage device to 80%.

[0024] In a preferred embodiment of the present invention, it can be provided that when the driver performs an operation, in particular when the accelerator pedal is operated to change the driving operating parameter to above the maximum value, the driving operating parameter is limited to the maximum value. In this case, in particular, the acceleration and / or speed of the vehicle is limited. In this way, the parameter range of the driving operating parameter is limited to the maximum value determined by the control device by the automatic vehicle itself. This makes it possible for the driver to comply with the limitation in a convenient manner and thereby achieve a temperature within the charging temperature range of the energy accumulator. In particular, the driving operating parameter is also limited only for acceleration, wherein, in the case of speed, as described above, only the operating information is displayed to the driver, so that the driver himself can decide to comply with the maximum value of the parameter range of the speed, that is, the maximum speed to achieve the energy accumulator temperature within the charging temperature range.

[0025] According to the invention, it can be provided that the limitation is only made during a part of the operation that can be used to change the driving operating parameter and / or according to the way the operation is performed, and / or only when the corresponding function is activated on the user interface of the vehicle. For example, it is feasible that the limitation to the maximum value is made during a part of the operation that can be used to change the driving operating parameter, and conversely, no limitation is made during another part of the operation that can be used to change the driving operating parameter, so that the maximum value can also be exceeded by the driver of the vehicle when the driver deems it necessary. Accordingly, the limitation can also be related to the way the operation is performed. For example, when the accelerator pedal of the vehicle is quickly stepped on, the acceleration and / or speed are not limited. It is also possible to limit the parameter range to the maximum value only when the corresponding function is activated on the user interface of the vehicle, so that the driver can complete or end the selection according to his wishes. Thus, the driver can especially choose to limit the acceleration and / or speed to the corresponding maximum value.

[0026] In a preferred embodiment of the present invention, it can be provided that the control device is set to perform automatic driving of the vehicle, wherein during the automatic driving, the driving operating parameter is set to be less than or equal to a maximum value. When the vehicle is driving automatically, it is also desirable to limit the parameter range of the driving operating parameter to achieve a charging time for the charging process at the destination. Thus, even when driving automatically on a longer journey, the shortest possible charging time and thus the shortest possible total journey time can be achieved.

[0027] Provision is made for a vehicle according to the invention to include a control device, at least one electric traction motor, an energy storage device electrically operable in an operating temperature range for operating the traction motor, and at least one temperature sensor for determining the temperature of the energy storage device, wherein the control device is designed to carry out the method according to the invention.

[0028] The at least one temperature sensor that determines the temperature of the energy storage device is in particular a temperature sensor that measures the temperature of a battery module of the energy storage device that includes one or more battery cells. In particular, the vehicle can also have a plurality of temperature sensors that are each associated with different battery modules of the energy storage device.

[0029] All advantages and embodiments described above with reference to the method according to the invention apply correspondingly to the vehicle according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Further advantages and details of the invention can be seen from the following described embodiments and with reference to the accompanying drawings. In which:

[0031] Figure 1 An embodiment of a vehicle according to the invention is shown, and

[0032] Figure 2 A flow chart of an embodiment of a method according to the invention is shown. DETAILED DESCRIPTION

[0033] exist Figure 1 , an exemplary embodiment of a vehicle 1 is shown. The vehicle comprises a control device 2 and an electric traction motor 3, which is operated by a power electronics system 4 of the vehicle 1 from an electric energy storage device 5 of the vehicle 1, which is designed as a battery. The vehicle 1 also comprises at least one temperature sensor 6, by which the temperature of the energy storage device 5 can be determined. The temperature sensor 6 is connected to the control device 2 and determines, for example, the temperature of a battery module of the energy storage device 5. The control device 2 is also connected to a display device 7 of the vehicle 1 for displaying information to the driver of the vehicle 1.

[0034] Furthermore, the control device 2 communicates with a further control device 8, for example a motor control device for operating the traction motor 3 and / or the power electronics 4. The connection between the temperature sensor 6 and the control device 2 and / or the communication between the control device 2 and the display device 7 and / or the further control device 8 can be realized, for example, via a data bus of the vehicle 1.

[0035] The control device 2 is designed to determine a maximum value of a parameter range of a driving operating parameter of the vehicle 1 as a function of the current temperature of the energy storage device 5 determined by the temperature sensor 6, so that after driving to a destination known to the control device 2 and / or after driving a predetermined distance with driving operating parameters limited by the maximum value of the parameter range, the predicted temperature of the energy storage device 5 is within the charging temperature range of the energy storage device 5. It is also possible to take into account the temperatures determined by a plurality of temperature sensors 6, each of which is associated with different battery modules of the energy storage device 5, when determining the maximum value. In order to predict the temperature of the energy storage device 5, a calculation rule and / or a model of the vehicle 1 for predicting the temperature of the energy storage device 5 as a function of at least one driving operating parameter can be stored in the control device 2, for example.

[0036] In this case, the charging temperature range is a subrange of the operating temperature range of the energy store 5, wherein the charging temperature range includes at least one temperature with a maximum value of the charging power for charging the energy store 5. The operating temperature range of the energy store can be, for example, between -10° C. and 65° C., wherein the charging temperature range can be, for example, between 10° C. and 50° C. or between 10° C. and 60° C. Depending on the embodiment of the energy store 5, the exact limits of the operating temperature range and / or the charging temperature range can vary.

[0037] exist Figure 2 , a flow chart of an exemplary embodiment of a method for determining a maximum value of a parameter range of a driving operating parameter of the vehicle 1, which is performed by the control device 2, is shown. For example, the acceleration and / or speed of the vehicle 1 can be used as driving operating parameters. In particular, driving at high speeds and / or requiring high acceleration powers for the electric traction motor 3 lead to high energy consumption of the energy accumulator 5. This high energy consumption of the energy accumulator 5 causes heating of the energy accumulator 5. In particular, when driving at higher speeds for a longer period of time and / or when high acceleration powers are frequently required, the temperature of the energy accumulator 5 can rise to values ​​above a prescribed charging temperature range, in which there is at least one temperature with a maximum charging power.

[0038] In order to prevent the charging process of the vehicle 1 from taking place at an unsuitable temperature of the energy storage device 5, that is, at a temperature outside the charging temperature range, the control device 2 determines a maximum value for the acceleration and / or speed of the vehicle 1 in step S1 when at least one triggering criterion is met. The maximum value is determined in such a way that when the vehicle 1 is driven to a destination known to the control device 2 within a parameter range of the driving operating parameters limited by the maximum value and / or when a predetermined distance, such as the still usable cruising range of the vehicle, is exceeded, the temperature of the energy storage device 2 is within the charging temperature range at the destination or after the distance has been exceeded.

[0039] In this case, the distance between the current vehicle position and the destination is used as a first trigger criterion, wherein the trigger criterion is met when the distance is less than a distance limit value. For example, the destination can be entered into a navigation device (not shown here) of the vehicle 1 and transmitted to the control device 2, so that the destination is known to the control device 2. Correspondingly, the current vehicle position can also be determined and made known to the control device 2, wherein the control device 2 can determine the fulfillment of the trigger criterion as the distance between the current vehicle position and the destination. If the distance is less than a distance limit value stored in the control device 2, in particular in the interval between 10 km and 100 km, for example a distance of 50 km, the control device 2 considers that the trigger criterion is met and determines the maximum value for this parameter range.

[0040] The remaining cruising range obtained from the current state of charge of the energy accumulator 5 is used as a second trigger criterion. When the remaining cruising range is less than the remaining cruising range limit, the control device 2 considers that the second trigger criterion is met. For example, a remaining cruising range between 10 km and 100 km, for example 50 km, can be used as a remaining cruising range limit. The control device 2 can, for example, be connected to the energy accumulator 5 and itself be configured to evaluate the state of charge and / or the remaining cruising range obtained from the state of charge. It is also possible that the determination is made by another controller 8 or another device of the vehicle 1, wherein the state of charge and / or the remaining cruising range of the vehicle 1 obtained from the state of charge of the energy accumulator 5 is transmitted to the control device 2.

[0041] If at least one of the triggering criteria is met in step S1, a maximum value of a driving range of a driving operating parameter of the vehicle 1 is determined in step S2. It is possible to determine a maximum value of a parameter range of the speed of the vehicle 1 and another maximum value of a parameter range of the acceleration of the vehicle 1. The maximum value or maximum values ​​are determined in this case such that after driving to a destination known to the control device 2 with driving operating parameters limited by the maximum values ​​of the parameter range, in particular a speed limited by the maximum values ​​of the parameter range and / or an acceleration limited by the maximum values ​​of the corresponding parameter range and / or after driving a predefined distance, in particular a remaining available cruising range, the predicted temperature of the energy storage device 5 is within the charging temperature range of the energy storage device 5.

[0042] After determining at least one maximum value, in step S3, operating information is displayed on the display device 7, wherein the operating information describes the limitation of the driving operating parameter and / or the maximum value of the limitation. In order for the temperature of the energy storage device 5 to be within the charging temperature range when reaching the destination or after a driving time of 20 km or 10 minutes, it can be shown on the display, for example, that the current speed of the vehicle needs to be limited to 110 km / h over the next 20 km or the next 10 minutes.

[0043] The driver of the vehicle 1 can also be made aware of the parameter range limitation of the acceleration of the vehicle 1 by displaying the operating information on the display device 7. The maximum value determined by the control device in step S2 can be displayed to the driver via the display device 7, or the driving of the vehicle 1 can be limited to one or more maximum values ​​in addition to or as an alternative to the display of the operating information. For this purpose, for example, the control device 2 transmits one or more determined maximum values ​​to the control device 8, which operates the electric machine 3 and / or the power electronics 4. The control device 8 can then comply with the maximum value determined by the control device 2 during the driving of the vehicle 1.

[0044] It is possible to display the speed limit of the driving operating parameter as operating information only when the determined maximum value is less than the speed value permitted for the current position of the vehicle 1. For example, the speed limit of 110 km / h described above by way of example is displayed to the driver only when the driver is driving on a highway where a higher speed of, for example, 130 km / h is permitted. If the vehicle 1 is driving on a road with a lower permitted speed, for example in an urban area where a maximum speed of 50 km / h applies, the display of the operating information on the display device 7 can be interrupted.

[0045] It is also possible that the operating information displayed on the display device 7 indicates the predicted charging time and / or the charging time difference determined by the control device 2. In this case, the charging time difference can be indicated between the charging time of a charging process with a predicted temperature within the charging temperature range and the charging time of a charging process with a maximum permissible temperature of the energy store outside the charging temperature range but within the operating temperature range. In this case, the charging time can relate to a complete charging or a partial charging of the energy store 5, in particular a partial charging of the energy store 5 at the maximum possible charging power.

[0046] In this way, the driver can be informed of how long the charging time will be required at the next charging stop if the vehicle continues to travel while maintaining the maximum values ​​for speed and / or acceleration. In addition or as an alternative, the time saving for the next charging process can also be displayed. For example, the driver can be shown that when driving to the destination or the distance to the destination at a maximum speed of 110 km / h, a time reduction of 15 minutes is achieved in the charging process to 80% of the capacity of the energy storage device 5.

[0047] It is possible that not only the maximum values ​​for limiting the parameter ranges are displayed to the driver via the display device 7, but also the speed and acceleration are limited to the maximum values ​​when an operation is performed (e.g., when the accelerator pedal is actuated). In this case, the driving operating parameters can be limited to the maximum values ​​when the driver changes the driving operating parameters to exceed the maximum values. When the driver actuates the accelerator pedal of the vehicle 1, the limitation can be performed by the control device 2 and / or another control unit 8.

[0048] In this case, the limitation is only carried out for a portion of the operations that can be used to change the driving operating parameters. It is also possible that the limitation is dependent on the type of operation carried out, so that, for example, when the gas pedal is pressed quickly, the limitation of the parameter range for speed and / or acceleration by the maximum value is again cancelled, so that the maneuverability of the vehicle 1 can be fully provided in this case. In particular, the maximum value is automatically set as the limit value of the driving operating parameter by the control device 2 and / or by the control unit 8 only when the driver activates the corresponding function on the user interface of the vehicle 1.

[0049] In addition to manual driving, in which driving parameter limits are displayed to the driver and / or driving parameter limits are taken into account for the operation, driving parameter limits can also be implemented in vehicles that are designed for automatic driving. For this purpose, for example, the control unit 8 of the vehicle 1 can be designed for automatic driving, wherein the maximum value determined by the control device 2 is transmitted to the control unit 8 and is adhered to by the control unit in the automatic driving mode.

[0050] It is possible for the control device 2 and the control unit 8 to be designed as a common control device and / or for the functions described above to be carried out in a control device which comprises one or more independent control units.

[0051] Determining maximum values ​​for the operating parameters of the vehicle 1 ensures that, during the charging stop, the temperature of the energy storage device 5 is within a charging temperature range that enables the most efficient possible charging of the energy storage device 5. As a result, the charging power that can be achieved at a temperature within the charging temperature range can be maximized, so that the duration of the charging process can be shortened. In addition, charging the energy storage device 5 at a temperature within the charging temperature range has the advantage that battery aging of the energy storage device 5 can be slowed down.

[0052] The vehicle can be limited to a maximum value according to the driver's wishes, thereby correspondingly limiting the operation and reducing the speed and / or the acceleration that can be achieved by the vehicle 1. It is also possible to display the corresponding maximum value, in particular for the speed, so that the driver can decide for himself based on the displayed operating information whether he wants to reduce the speed to the maximum value and thus reduce the temperature of the energy storage device 5 to a temperature within the charging temperature range.

Claims

1. A method for determining a maximum value of a parameter range of a driving operating parameter of a vehicle (1), wherein: The vehicle (1) comprises a control device (2), at least one traction motor (3), an electric energy storage device (5) operable in an operating temperature range for operating the traction motor (3), and at least one temperature sensor (6) for determining the temperature of the energy storage device (5), wherein the control device determines the maximum value based on the current temperature of the energy storage device (5) determined by the temperature sensor, so that after driving to a destination known to the control device (2) with driving operating parameters limited by the maximum value of the parameter range and / or after driving a preset distance, the temperature of the energy storage device (5) is predicted to be within a charging temperature range, wherein the charging temperature range is the operating temperature range. The invention relates to a sub-range of a range of driving parameters and comprising at least one temperature having a maximum value of a charging power for charging an energy storage device (5), wherein the vehicle (1) has a display device (7) for displaying information to a driver, wherein after determining the maximum value, a limitation of a driving operating parameter and / or operating information indicating the maximum value is displayed on the display device (7); the displayed operating information comprises a predicted charging time determined by a control device and / or a charging time difference determined by the control device between a charging time for charging at a predicted temperature within the charging temperature range and a charging time for charging at a maximum permissible energy storage device (5) temperature outside the charging temperature range.

2. The method according to claim 1, characterized in that The speed of the vehicle (1) and / or the acceleration of the vehicle (1) are used as driving operating parameters.

3. The method according to claim 1 or 2, characterized in that: The control device (2) carries out the determination of the maximum value when at least one triggering criterion monitored by the control device (2) is met.

4. The method according to claim 3, characterized in that: The distance between the current vehicle position and the destination to be driven to is used as a trigger criterion, wherein the trigger criterion is met when the distance is less than a distance limit value.

5. The method according to claim 3, characterized in that: A remaining cruising range derived from the charge state of the energy storage device (5) is used as a trigger criterion, wherein the trigger criterion is met when the remaining cruising range is less than a cruising range limit value.

6. The method according to claim 1, characterized in that When speed is used as the driving operating parameter, the operating information is displayed only when the maximum value is below a permissible value of the driving operating parameter for the current position of the vehicle (1).

7. The method according to claim 1 or 2, characterized in that: In the event of an operation by the driver, the driving operating parameter is limited to a maximum value.

8. The method according to claim 7, characterized in that The restriction is only carried out in the case of a part of the operations that can be used to change the driving operating parameters and / or is only carried out depending on the way the operations are carried out and / or is only carried out when a corresponding function is activated on a user interface of the vehicle (1).

9. The method according to claim 1 or 2, characterized in that: The control device (2) is configured to execute autonomous driving of the vehicle (1), wherein during the autonomous driving, a driving operation parameter is set to be less than or equal to a maximum value.

10. The method according to claim 7, characterized in that If the driver actuates the accelerator pedal in order to change the driving operating parameter to a value exceeding a maximum value, the driving operating parameter is limited to the maximum value.

11. A vehicle comprising a control device (2), at least one traction motor (3), an electrical energy storage device (5) operable in an operating temperature range for operating the traction motor (3), and at least one temperature sensor (6) for determining the temperature of the energy storage device (5), wherein: The control device is designed to carry out the method according to any one of claims 1 to 10 .

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