Display device for displaying the electric drive and recuperation power of a motor vehicle

Abstract

The invention relates to a display device (1) for displaying an electric drive and recuperation power provided by an electric drive (2) of an electrically powered motor vehicle. The display device (1) comprises a display surface (4) and a control device (5) coupled to the display surface (4) for controlling a display of information on the display surface (4). The control device (5) is designed to display a first scale (6) for displaying the drive power and a second scale (7) for displaying the recuperation power on the display surface (4). Furthermore, the control device (5) is designed to display an instantaneous electric drive power (8) on the first scale (6) and an instantaneous electric recuperation power (9) on the second scale (7).The control device is further configured to selectively display an information field (27) on the display surface (4) adjacent to the first (6) and second (7) scales, in which field, retrospectively for a distance traveled or a time traveled, a curve (28) of the provided electrical drive power (28) and / or a curve (29) of the provided electrical recuperation power is shown. This advantageously provides a user with a clear representation of various power components of the electric drive system, thus promoting a forward-looking and resource-saving driving style.

Description

[0001] The invention relates to a display device for displaying electric drive and recuperation power provided by an electric drive system of an electrically powered motor vehicle. The invention further relates to a motor vehicle with such a display device.

[0002] Such display devices are designed to indicate how much drive power a motor vehicle's electric drive is currently providing or how much of the motor vehicle's kinetic energy the electric drive is currently recovering as electrical energy during braking, which can then be stored back in the traction battery. Such display devices, e.g., implemented as part of a motor vehicle's digital instrument cluster, are commonly referred to as power meters.

[0003] Conventional power meters, familiar from practical use, provide the driver with information about the currently available electric drive or recuperation power. However, the currently maximum achievable drive or recuperation power can be limited by various factors depending on the vehicle's current operating situation. For example, the currently maximum available drive power may be reduced because electrical power is required for other consumers or the drive system is overheating. The currently maximum achievable recuperation power may be reduced because the traction battery is almost fully charged and can no longer absorb any additional recuperated electrical energy.

[0004] Such a change in the currently maximum achievable drive or recuperation power is usually not sufficiently visualized to the driver. Accordingly, the driver cannot optimally plan corresponding driving maneuvers that could be influenced by this, such as overtaking maneuvers or resource-efficient braking. Conventional power meters also do not provide the driver with information about past driving behavior with regard to electric drive or recuperation power, at least not in a way that would allow a driver to draw conclusions regarding the efficiency of their driving style, ideally without additional distraction from the driving task, in order to be able to adapt their driving behavior accordingly if necessary.

[0005] The objective is therefore to provide an improved display device for displaying electric drive and recuperation power, which avoids the disadvantages of conventional approaches. In particular, such a display device is intended to provide a driver with improved information for planning subsequent (upcoming) driving maneuvers, preferably in a manner that does not distract the driver from the driving task.

[0006] The problem is solved by a display device having the features of the independent claim. Advantageous further developments are specified in the dependent claims and the description.

[0007] According to one aspect, a device is provided for displaying an electric drive power and an electric recuperation power provided by an electric drive system of an electrically powered motor vehicle. This device is referred to below as a display device or power meter. The display device is preferably a display device for displaying the electric drive power and an electric recuperation power at a driver's seat of the motor vehicle. The display device can be part of a digital instrument cluster of the motor vehicle. The motor vehicle is preferably a commercial vehicle.

[0008] The display device comprises a display surface and a control device coupled to the display surface for controlling the display of information on the display surface. The control device is designed to display a first scale for displaying the drive power and a second scale for displaying the recuperation power on the display surface. Furthermore, the control device is designed to display a current electrical drive power on the first scale and a current electrical recuperation power on the second scale. For this purpose, the control device determines numerical values ​​for the measured variables current drive power and current recuperation power. The current electrical drive power corresponds to the electrical drive power currently being used to drive the motor vehicle.The current electrical recuperation power corresponds to the electrical power that is currently recovered by the electric drive during a recuperative braking process.

[0009] A first general aspect of the present disclosure relates to embodiments in which the control device is preferably configured to display a temporarily unavailable range of drive power on the first scale and / or a temporarily unavailable range of recuperation power on the second scale. In this way, an unavailable range of drive power and / or recuperation power is visually indicated to the driver when the maximum available drive power and / or recuperation power is not available.

[0010] The temporarily unavailable range of drive power corresponds to the difference between the maximum available drive power and the actually available (callable) drive power. Maximum available drive power here means the maximum power that the motor vehicle can provide under ideal conditions, which can optionally include switchable boost power. In real driving conditions, the actually available (callable) drive power can be reduced by various factors, i.e. the driver actually has less than the maximum drive power available. It has already been stated above that the maximum achievable drive power in real driving conditions can be limited, for example, because electrical power is required for other consumers or the drive system has overheated.

[0011] By displaying the temporarily unavailable range of drive power, the driver can advantageously see at a glance how much drive power is currently available, i.e. how much drive power they could theoretically draw on. In particular, the current electric drive power and the temporarily unavailable range of drive power are displayed together on the same first scale. The driver can therefore see at a glance how much more power they could draw on relative to the current actual electric power, enabling particularly intuitive and therefore safe planning of subsequent driving maneuvers. In particular, the driver can see when rapid acceleration and high speeds are not possible, allowing them to refrain from driving maneuvers that would require them. Driving safety is correspondingly increased.

[0012] Similarly, the recuperation power, i.e., the power that can be recovered by the electric drive during braking, can also be limited by various factors. The temporarily unavailable range of recuperation power is determined by the difference between the maximum available recuperation power and the actually (currently) available recuperation power.

[0013] Maximum available drive power here therefore refers to the maximum recuperation power that the electric drive system can provide in recuperative operation under ideal conditions. However, if a traction battery of the drive system has a high state of charge, for example, it can only absorb a limited amount of recuperated energy. In such a situation, the actual (currently) available recuperation power in recuperation mode is less than the (theoretical) maximum available recuperation power. The difference is displayed to the driver on the second scale. This allows the driver to see at a glance before and / or during a recuperative braking maneuver how much recuperation power could be captured as reusable energy. This allows the driver to better plan their braking maneuvers in advance and thus promote an energy-saving driving style.

[0014] According to a further embodiment, the first scale has a first range extending from zero to a first scale end representing maximum drive power without boost support. The first scale end can, for example, be marked with the value 100% on the first scale. Optionally, the first scale also has a boost range extending from the first scale end to a second scale end representing maximum drive power with boost support. Boost support allows the driver to access drive power above the normal maximum drive power for a limited period of time. Whether boost support is available can depend on various factors, e.g., the temperature of a traction energy storage device. If boost support is not available, this can be indicated to the driver by an unavailable range.The clear visual indication when the boost range is not available can also encourage the driver to drive smoothly and economically in order to have the boost support available when it is needed.

[0015] The temporarily unavailable range of drive power can extend from the second scale end beyond the first scale end into the first range. In other words, the temporarily unavailable range of drive power can extend beyond the boost range into the first range. This is advantageous for indicating current limitations of drive power that extend beyond the unavailability of the boost drive.

[0016] In a further embodiment, the first scale only has the first range, which extends from zero to the first scale end, which represents maximum drive power without boost assistance. In this case, the temporarily unavailable range of drive power can extend from the first scale end into the first range. Optionally, a boost range can be arranged at a different location, e.g. at a different location on the display surface, spaced apart and / or geometrically separated from the first and second scales on the display. The boost range can, for example, be displayed on its own scale (third scale). The separate display of the third scale makes it clear to the driver that the boost assistance is only temporary support for performing power-intensive driving maneuvers and is not intended for continuous use during normal driving.Preferably, the display of the boost range and / or the third scale can be visually displayed differently depending on whether boost assistance is available or not. For example, the boost range and / or the third scale can be displayed in a light color, e.g., white, when boost assistance is available, and in a dark color, e.g., grayed out, when boost assistance is not available. This allows the rider to see at a glance whether boost assistance is available at that moment or not.

[0017] According to a further preferred embodiment, the temporarily unavailable range of drive power can be displayed as a range with a different color, e.g., as a grayed or hidden range, and / or with a different pattern than an available range of drive power on the first scale. Such a display allows the driver to understand at a glance what drive power is available to them without unnecessarily alarming them and without distracting them from the driving task.

[0018] Additionally or alternatively, the temporarily unavailable drive power range can include the display of a dynamic end stop for the currently maximum available drive power on the first scale. The unavailable drive power range can then be displayed on the first scale as a range extending from the second scale end to the displayed dynamic end stop. Alternatively, the unavailable drive power range can also be displayed only as a dynamic end stop. The term "dynamic" in this context means that the position of the end stop changes depending on the current size of the temporarily unavailable drive power range.The dynamic end stop optically limits the currently available drive power by limiting the first range in such a way that the current electrical drive power cannot penetrate into the temporarily unavailable range of the drive power.

[0019] In a further preferred embodiment, the control device is further designed to display the instantaneous electrical power take-off (ePTO) of the motor vehicle on the first scale when an electrically operated power take-off (ePTO) of the motor vehicle is activated. An electric power take-off can be used, especially in commercial vehicles, to supply additional working units and components, e.g., a mixer or a rotating brush, with electrical drive power. If the power comes from the traction battery, which also supplies the electric drive with electrical power, this can reduce the available drive power for the drive. Displaying the instantaneous electrical power of the ePTO together with the driving power on the first scale can thus give the driver an overview of how much power is being drawn from the traction battery.In particular, the driver receives additional information about a significant consumer over which the driver may not be able to influence despite economical driving. Furthermore, the display of the ePTO's current electrical power on the first scale allows the driver to better understand the cause of the temporarily unavailable range of drive power (at least in part) when an ePTO is active.

[0020] In one embodiment, the instantaneous drive power and the ePTO power are displayed side by side on the first scale, each with a pointer, preferably with a segmented or continuous bar. Preferably, the pointer, e.g., the bar, for the ePTO power is displayed narrower and / or less prominently than the pointer for the instantaneous drive power. A pointer can be any graphic element suitable for displaying values ​​on a scale. This can be, for example, a bar, a column, an arrow, or a combination thereof. Displaying the drive power and the ePTO power side by side makes it visually clear to the driver that power is being drawn from the traction battery. The narrower and / or less prominent display of the ePTO pointer minimizes the driver's distraction from their driving task.

[0021] According to a further embodiment, the temporarily unavailable range of recuperation power can be displayed as a range with a different color, e.g., a grayed-out area, and / or a different pattern than an available range of recuperation power on the second scale. Additionally or alternatively, the temporarily unavailable range of recuperation power can include the display of a dynamic end stop for the currently maximum available recuperation power on the second scale. The second scale can extend from zero to a third scale end representing maximum recuperation power, which is preferably marked as 100%. Analogous to the display of the available range of drive power, this allows the driver to determine the status and further availability of the recuperative braking system at a glance.

[0022] In a further preferred embodiment, the control device is configured to indicate the activation of a non-regenerative service brake on the second scale and / or adjacent to the second scale. The non-regenerative service brake may be and / or comprise a dissipative service brake, i.e., the braking energy is not returned to the traction energy storage device, but is dissipated, for example, in the form of heat. The service brake may also be and / or comprise a retarder brake (primary retarder and / or secondary retarder).

[0023] To ensure the most energy-efficient driving style, the use of a regenerative braking system is preferable in most cases. However, the use of a service brake may be necessary, for example, to bring the vehicle to a complete stop if the regenerative braking system cannot provide sufficient braking power and / or cannot do so quickly enough. The indication of the non-regenerative service brake can guide the driver to brake as proactively as possible, aiming for the most frequent use of the regenerative braking system. The indication of the activation of a non-regenerative service brake on the second scale and / or adjacent to the second scale can, for example, be adjacent to the dynamic end stop of the regenerative power.

[0024] According to a preferred embodiment, the activation of the non-regenerative service brake can be indicated by a graphic element, e.g., by a symbol or a tail, on the second scale and / or adjacent to the second scale. The symbol can, for example, be a symbol that is displayed when the service brake is activated and hidden when the service brake is deactivated. Alternatively, it can be designed as a symbol that symbolizes the strength of the service brake intervention, e.g., by being displayed more clearly or larger the stronger the service brake intervention. The symbol can, for example, be displayed in bar form, with the bar height being greater the stronger the service brake intervention.

[0025] In a further embodiment, the graphic element is displayed in the temporarily unavailable range of recuperation power, preferably adjacent to and / or adjacent to the dynamic end stop. In this way, the service brake intervention is visually presented to the driver as an extension of the regenerative braking system, allowing the driver to see all information regarding braking performance at a glance.

[0026] According to a further embodiment, the control device is designed to display the first scale and the second scale on the display surface such that the first scale and the second scale are arranged one above the other and in alignment with one another. In other words, a power scale field is displayed on the display surface in which the first scale and the second scale each occupy adjacent positions. The zero point of the first scale and the zero point of the second scale preferably coincide. The first and second scales can each extend in opposite directions in the direction of increasing power values. The driver thus receives advantageous information for the anticipatory planning of driving maneuvers at a glance, without being unnecessarily distracted by many different displays.

[0027] A second general aspect of the present disclosure relates to embodiments in which the control device is preferably designed to selectively display an information field on the display surface adjacent to the first and second scales, in which information field, looking back for a distance traveled or a time traveled, a curve of the provided electrical drive power and / or a curve of the recuperation power is shown. In other words, the driver can, if necessary, in addition to the display of the first and second scales, selectively, i.e. optionally and when required, display a further information field. The information field displays information about the electrical drive power and recuperation power provided in the past, which are also referred to below for short as historical drive power and historical recuperation power.

[0028] In this way, the driver receives additional information, if needed, about the electric drive power and recuperation power along a previously traveled distance and / or during a past period. This information can, for example, tell the driver whether the braking behavior was efficient, allowing the greatest possible portion of the braking energy to be recuperated, or which sections of the road used particularly high or low levels of drive energy. Using this information, the driver can determine how to improve driving maneuvers in the future, particularly how to implement a particularly resource-efficient driving style.

[0029] According to one embodiment, the curve of the provided electric drive power and recuperation power is displayed as a bar chart, preferably as a histogram. Such a display allows the driver to read the information in a simple, intuitive manner without being overloaded with excessive or unnecessary details.

[0030] The display in the information window, looking back at a distance traveled or a time traveled, can be designed in such a way that the distance traveled or the time elapsed is divided into individual time periods or distance sections and the drive power and / or the recuperation power are displayed in summary form for each of the individual time periods or distance sections, e.g. in the form of a bar chart or a histogram display.

[0031] According to a further embodiment, the control device is designed to display the information displayed in the information window spatially and graphically in relation to the corresponding information on the first scale and second scale. This can include the information displayed in the information window being aligned with the first and / or second scale, such as the current drive power and the current recuperation power. Furthermore, the same graphical elements or at least similar graphical elements can be used to display the historical drive power in the information window as for displaying the current drive power. Furthermore, the same graphical elements or at least similar graphical elements can be used to display the historical recuperation power in the information window as for displaying the current recuperation power.This allows the driver to see the information in the information field at a glance, even if it is only displayed briefly, without having to first find their way around new scales.

[0032] According to a further embodiment, the control device is designed to display the course of the provided drive power graphically in the information window in the form of a plurality of pointers assigned to the first scale, preferably in the form of bars, and to display the course of the provided recuperation power graphically in the form of a plurality of pointers assigned to the second scale, preferably in the form of bars.

[0033] Particularly preferably, a bar display is used for both the current drive and / or recuperation power and the historical drive and / or recuperation power. The bar display of the information field preferably visually matches that of the first and / or second scale, allowing the driver to connect the different pieces of information at a glance. For this purpose, the scales and the information field can be displayed, for example, at the same height and / or with the same scale divisions.

[0034] According to a further embodiment, the bars used in the information window to display the drive power and the recuperation power for a specific past distance or time segment are displayed one above the other and preferably aligned with each other. Accordingly, the corresponding axes representing the time or distance progression can coincide, or they can be arranged in a corresponding manner, e.g., parallel to each other, and have a matching length and scale. The positive direction of the drive power and the positive direction of the recuperation power can extend in opposite directions.

[0035] In a preferred development, the control device is further configured to display the current electrical power take-off (ePTO) on the first scale upon activation of an electrically operated power take-off (ePTO) and, retrospectively for the distance traveled or the time traveled, to display a curve of the ePTO's power in the information window. In particular, the driver can obtain information from the historical curve about how the electrical power of the ePTO has affected the electric drive, allowing them to proactively adapt their driving style to the power of the electrically operated power take-off in the future.

[0036] In an advantageous development, the control device can be configured to display the instantaneous drive power and the ePTO power side by side on the first scale, each with a pointer, preferably with a segmented or continuous bar. Preferably, the pointer for the ePTO power is displayed narrower and / or less prominently than the pointer for the instantaneous drive power. Furthermore, the control device can be configured to display the drive power curve and the ePTO power curve in a corresponding manner, side by side in the information field, and preferably in spatial association with the first scale.

[0037] According to a further embodiment, the control device is designed to display an average value for the distance traveled or the time traveled for the following variables in the information window: the electric drive power, the recuperation power, and preferably the power of the ePTO. The average value can be displayed, for example, by a line within the information field, which is optionally labeled with a graphic symbol for identifying average values. The average value can be displayed separately for each or individual of the variables mentioned and / or as a combination of different variables. The additional display of the average value advantageously allows the driver to compare different time or distance segments with the average value and thus improve their driving behavior in the future.

[0038] According to a further embodiment, the control device is designed to display an activation of a non-regenerative service brake on the second scale and / or adjacent to the second scale and to display a history of the activation of the non-regenerative service brake in the information window in retrospect for the distance traveled or the time traveled.

[0039] The activation of the non-regenerative service brake can be indicated by a graphic element, e.g., a symbol, e.g., a columnar symbol, or a tail, on the second scale and / or adjacent to the second scale. The progression of the activation of the non-regenerative service brake can be displayed in the information window in a corresponding manner, and preferably in spatial association with the second scale.

[0040] The present disclosure further relates to a motor vehicle comprising a display device as described herein. Preferably, the motor vehicle is a commercial vehicle (e.g., a truck or bus). A commercial vehicle can generally be understood to mean a vehicle whose design and equipment are specifically designed for transporting people, goods, or towing trailers.

[0041] The previously described preferred embodiments and features of the invention can be combined with one another in any desired manner. It is emphasized that all embodiments relating to the first general aspect and the second aspect are intended to be disclosed and claimable both in combination and independently of one another.Thus, the embodiments in which the control device is preferably designed to display a temporarily unavailable range of the drive power on the first scale and / or a temporarily unavailable range of the recuperation power on the second scale can optionally be combined with embodiments in which the control device is designed to optionally display an information field on the display surface adjacent to the first and second scales, in which, looking back for a distance traveled or a time traveled, a curve of the provided electrical drive power and / or a curve of the recuperation power is shown.

[0042] Furthermore, embodiments in which the control device is preferably designed to optionally display an information field on the display surface adjacent to the first and second scales, in which information field, retrospectively for a distance traveled or a time traveled, a curve of the provided electrical drive power and / or a curve of the recuperation power is shown, can optionally be combined with embodiments in which the control device is designed to display a temporarily unavailable range of the drive power on the first scale and / or a temporarily unavailable range of the recuperation power on the second scale.

[0043] Further details and advantages of the invention are described below with reference to the accompanying drawings. They show: Fig. 1 a schematic representation of a motor vehicle with a display device for displaying an electric drive and recuperation power according to an embodiment; Fig. 2a and Fig. 2b schematic representations of a display area of ​​a power meter with positive drive power according to another embodiment; Fig. 3a and Fig. 3b schematic representations of a display surface of a power meter during a recuperative braking process according to another embodiment; Fig. 4a to 4e are schematic representations of a section of a display surface according to different operating states of the motor vehicle; and Fig. 5 a schematic representation of a display area with an information field displayed according to a further embodiment of the invention.

[0044] The embodiments shown in the figures correspond at least partially, so that similar or identical parts are provided with the same reference numerals and for their explanation reference is also made to the description of the other embodiments or figures in order to avoid repetition.

[0045] The Fig. 1 shows a schematic representation of an electrically powered motor vehicle 3, which in the present case is embodied as a commercial vehicle by way of example. The motor vehicle comprises an electric drive 2 for driving the motor vehicle. The electrical energy for driving the vehicle can be provided, for example, by a traction battery (not shown) or a fuel cell (not shown). The motor vehicle further comprises a service brake 24, in which braking energy is dissipated, e.g., in the form of heat, and the braking energy is not stored for later reuse. In addition, the motor vehicle 3 can comprise an electrical power take-off 19 (English: electrical power take-off), hereinafter referred to as ePTO for short. The ePTO 19 can be used, for example, to supply working units of the motor vehicle 3 with electrical power.

[0046] In order to provide a user of the motor vehicle 3, in particular the driver, with information about the behavior of the electric drive 2, the motor vehicle 3 comprises a display device 1 (power meter) for displaying an electric drive and recuperation power provided by the electric drive 2. The display device 1 comprises a display surface 4 and a control device 5 coupled to the display surface 4 for controlling the display of information on the display surface 4. The term "control device" can preferably comprise a program-configured computer unit with an associated data memory. Furthermore, the term "control unit" can refer to electronics (e.g., embodied as a driver circuit or with microprocessor(s) and data memory).

[0047] The display device can be part of a digital instrument cluster of the motor vehicle. The display surface 4, e.g., a screen, can be arranged in the cockpit area of ​​the motor vehicle. The display surface 4 is described in more detail in various embodiments in the following figures.

[0048] In the Fig. 2a to 4e show embodiments relating to the first general aspect, which concerns the display of a temporarily unavailable range of the drive and / or recuperation power.

[0049] Fig. 2a initially shows a display surface 4 of the display device (the power meter). The display surface 4 has a first scale 6 for displaying a drive power and a second scale 7 for displaying a recuperation power. The two scales 6, 7 are preferably arranged one above the other and in alignment with each other. The zero point 13 of the two scales can coincide and / or lie in the same range. The positive power values ​​can increase in opposite directions. In the case shown, the power values ​​of the electrical drive power, i.e., the first scale 6, increase upwards. On the second scale 7, the increasing numerical values ​​of the recuperation power extend downwards.Such a representation is particularly intuitive for the driver, since positive drive power is associated with acceleration, or at least positive movement of the vehicle, while braking represents negative acceleration.

[0050] The first scale 6 for displaying the drive power can have a first scale end 14 that represents maximum drive power without boost support. Accordingly, this first scale end 14 can be marked, for example, with the value 100%. Alternatively, the first scale end can also be marked with a different percentage value and / or with a numerical value representing an absolute power output.

[0051] The first scale preferably includes a second scale end 16, which indicates maximum drive power with boost support. The boost range 15 extends between the first scale end 14 and the second scale end 15. The boost support can enable the driver to briefly access more than 100% drive power for driving the motor vehicle. This can be used when a particularly high level of drive power is required for a short time, for example, when performing an overtaking maneuver by a heavy commercial vehicle. The range between the zero point 13 and the first scale end 14 can be referred to as the first range 14a to better distinguish it from the boost range 15.

[0052] According to the Fig. In the operating situation illustrated in Figure 2a, the electric drive system provides a drive power that is above the normal maximum drive power of 100%. Accordingly, the representation of the instantaneous electric drive power 8 extends into the boost range 15. The instantaneous electric drive power 8 corresponds to the power that is actually used (applied) to drive the motor vehicle at the given moment. The instantaneous drive power 8 is preferably represented by means of a pointer. A pointer can be understood as any graphic element that is suitable for pointing to a specific numerical value on a scale, here, for example, the first scale 6. The pointer is designed as a bar. In the example of the Fig. 2a, the upper edge of the bar is also highlighted to allow the driver to read the corresponding value particularly easily and with minimal distraction.

[0053] In the example of Fig. 2a, the entire maximum drive power and additionally the boost range 15 are available to the driver for driving. For this purpose, the bar 15 indicating the boost range is visually displayed in a state that means that the boost range is available. During real driving operation, however, it may happen that less drive power is actually available to the driver. Such a limitation can occur due to various factors, for example if the temperature of a traction battery is not in the ideal range or if a significant portion of the power provided by the traction battery is used for tasks other than driving, e.g., to operate an ePTO. In particular, the boost range 15 is usually only available to the driver for a limited period of time, since the traction battery typically heats up considerably due to the heavy load during boost support.

[0054] In Fig. 2b illustrates such a situation in which the actually available drive power is lower than the situation of the Fig. 2a is reduced. In the Fig. In the example shown in Figure 2b, less than 100% of the maximum drive power is available to the driver for driving. Accordingly, a temporarily unavailable range 10 of the drive power is displayed on the first scale 6. The temporarily unavailable range of the drive power 10 can only comprise the boost range 15 or parts thereof, or can extend, for example, from the second scale end 16 beyond the boost range 15 and the first scale end 14 into the first range 14a. Such a situation is exemplified in Fig. 2b.

[0055] The unavailable area 10 is preferably displayed as an area with a different color, e.g., as a grayed or hidden area and / or with a different pattern than an available range of the drive power on the first scale 6. The unavailable area 10 is shown here only as an example by a narrow segmented bar, which is in the Fig. 2b extends from the second scale end 16 into the first area 14a.

[0056] The temporarily unavailable range 10 of the drive power 10 may further include an indication of a dynamic limit stop 18 for the maximum available drive power on the first scale 6. The dynamic limit stop 18 is shown here as the end of the unavailable range 10. It can thus be seen that not only the boost range 15, but also an upper subrange of the first range 14a, is temporarily unavailable.

[0057] In the example shown, the current electrical drive power 8 corresponds exactly to the actually available drive power, i.e. the bar 8 indicating the current electrical drive power extends to the end stop 18. By displaying the unavailable drive power, the driver is clearly informed that the area marked by bar 10 is not available. The driver can see at a glance that the current electrical drive power 8 cannot exceed the dynamic end stop 18. The driver is accordingly informed that power-intensive driving maneuvers, e.g. overtaking, could lead to difficulties in a given case. The driver can therefore plan their driving maneuvers better, thus increasing overall safety.

[0058] Depending on the size of the temporarily unavailable range 10 of the drive power, the size of the bar 10 or the position of the dynamic end stop 18 changes.

[0059] The control device 5 can further be designed to display the instantaneous electrical power 20 of the ePTO on the first scale 6 when it is activated. Fig. Figure 2b shows an exemplary embodiment. Here, the current drive power 8 for the traction drive and the current power 20 of the ePTO 19 are displayed side by side on the first scale 6, each with a bar. It is advantageous if the bar for the power of the ePTO 19 is displayed narrower and / or less prominently than the bar for the current drive power 8.

[0060] The simultaneous display of the current power 20 of the ePTO 19 offers the advantage that the driver can, on the one hand, monitor the power consumption of the ePTO and, on the other hand, recognize why the temporarily unavailable range 10 is currently so large, e.g., because the electrical power required to supply the ePTO is not available as drive power for the traction drive.

[0061] The Fig. 3a and Fig. 3b show schematic representations of a display surface of a power meter during a recuperative braking process according to another embodiment.

[0062] The first scale 6 runs, for example, from the zero point 13 to the first scale end 14, which is marked here with 100%. The first scale does not have a boost range. The boost range can optionally be displayed on a third scale (not shown) on the display surface 4, separate from the first and second scales. During regenerative braking, the second (lower) scale 7 is used. A temporarily unavailable range 11 of the recuperation power can be displayed on the second scale 7 in a similar way to the previously described unavailable range of the drive power.

[0063] Fig. However, Figure 3a initially shows an operating situation in which the entire (theoretically) available recuperation range is available. The second scale indicates no restriction or temporarily unavailable range 11 of recuperation power.

[0064] The instantaneous electrical recuperation power 9, ie the electrical power that can be recovered due to a recuperative braking process, can be displayed on the second scale 7, for example, using a pointer, e.g. a bar here.

[0065] In the Fig. In the example shown in Figure 3a, the entire maximum recuperation power is available and, as indicated by the bar indicating the instantaneous electrical recuperation power 9, is also fully utilized. If the recuperatively generated braking power is insufficient, a non-regenerative service brake can also be activated to provide support. A non-regenerative service brake, for example, is a dissipative braking system in which braking energy is not captured and stored for reuse. Instead, the kinetic energy released during braking is dissipated, for example, in the form of heat.

[0066] The activation of the non-regenerative service brake can be represented by a graphic element 26, e.g., by a symbol or a tail on the second scale. The length of the tail can preferably be proportional to the strength of the service brake braking intervention. Preferably, the service brake graphic element 26 is displayed adjacent to the display of the instantaneous electrical recuperation power 9. This conveys to the driver that the use of the service brake represents a braking intervention that goes beyond the use of the regenerative braking system.

[0067] The representation of the graphic element 26 of the service brake is preferably selected, e.g., through a suitable color scheme, to make it clear to the driver that the use of the service brake results in disadvantageous energy loss, thus constituting a non-resource-efficient driving style. The driver is encouraged to adjust their braking behavior so that the braking process can be performed by the regenerative braking system as much as possible. At the same time, the graphic element 26 can be designed so that the driver is not unnecessarily alarmed, since the intervention of the service brake does not constitute an error in the true sense of the word.

[0068] The use of the service brake may be necessary, especially when a particularly strong braking intervention is required. The use of the service brake may also be necessary if the full recuperation power of the regenerative braking system is temporarily unavailable. This can be the case, for example, if the traction battery and / or the electric motor of the traction drive are in a critical temperature range due to high load, or if the traction battery is heavily charged and can no longer absorb recuperated energy.

[0069] This situation is in Fig. 3b. Analogous to the representation of the temporarily unavailable range of the drive power of the Fig. 2a and Fig. 2b, is in Fig. 3b, a temporarily unavailable range 11 of recuperation power is shown. Preferably, the temporarily unavailable range 11 of recuperation power is displayed as a different color, e.g., as a grayed-out range and / or as a different pattern than an available range of recuperation power on the second scale 7.

[0070] The display of the unavailable range 11 of the recuperation power on the second scale 7 may include the display of a dynamic end stop 23 of the recuperation power 23. The dynamic end stop 23 is shown here as the (upper) end of the unavailable range 11.

[0071] The display of the temporarily unavailable recuperation power range 11 visually indicates to the driver at a glance that the actual available recuperation power is currently reduced. The driver can therefore plan their driving maneuvers proactively, for example, by allowing for a longer braking distance, thus achieving the most resource-efficient driving style possible.

[0072] If more braking power is required than the regenerative braking system can provide, the service brake preferably engages, which is represented by the service brake graphic element 26. The graphic element 26 is preferably displayed in the temporarily unavailable range of the recuperation power 11 and particularly preferably adjacent to and / or adjacent to the dynamic end stop 23 of the recuperation power.

[0073] In the Fig. Figures 4a to 4e schematically illustrate various braking situations. For clarity, only the section of the display area that encompasses the area of ​​the second scale 7 is shown.

[0074] In Fig. Figure 4a shows the situation in which the maximum recuperation power is available. Accordingly, no temporarily unavailable range is indicated. The braking intervention is weak enough that the current actual electrical recuperation power 9 is less than the actually available electrical recuperation power.

[0075] In the Fig. 4b, the maximum recuperation power is also available. The braking intervention is just strong enough that the current electrical recuperation power 9 just corresponds to the maximum recuperation power, but the service brake does not intervene. Accordingly, braking can be performed purely regeneratively.

[0076] In Fig. 4c, the maximum recuperation power is still available, but the braking force has been further increased, e.g. by further depressing the brake pedal, so that the service brake is used, which is illustrated by the graphic element 26 of the service brake.

[0077] The representation of the Fig. 4d essentially corresponds to the situation of Fig. 3b, i.e., the maximum recuperation power is not available. A temporarily unavailable recuperation power range 11 is displayed. The indicator for the current electrical recuperation power 9 is limited by the dynamic recuperation power limit stop 23. Additional required braking power is provided by the non-regenerative service brake.

[0078] In the Fig. Figure 4e illustrates the situation where no recuperation power is available temporarily. Accordingly, the temporarily unavailable range 11 of recuperation power extends across the entire range of the second scale 7. This situation can occur, for example, if the traction energy storage unit is fully charged (e.g., due to a previous long downhill drive during which the traction energy storage unit was charged by regenerative braking) and therefore cannot absorb any more energy.

[0079] The Fig. 5 illustrates an embodiment relating to the second general aspect. According to this second general aspect, the control device 5 is configured to optionally display an information field 27 on the display surface 4 adjacent to the first 6 and second 7 scales, in which field, retrospectively for a distance traveled or a time traveled, a curve 28 of the provided electrical drive power 28 and / or a curve 29 of the provided electrical recuperation power is shown.

[0080] On the display surface 4, a first scale 6 is shown to indicate the drive power and a second scale 7 to indicate the recuperation power. In the representation of the Fig. 5 this can be seen on the right side. This part of the display area can be assigned to any of the previously described embodiments, e.g. as shown in the Fig. 2a to 4e, which includes, for example, the display of a temporarily unavailable range of drive power and / or recuperation power. Optionally, the display of the current drive power and the current recuperation power can also be designed such that temporarily unavailable ranges of drive power and / or recuperation power are not visually displayed.

[0081] In addition, an information field 27 is optionally displayed on the display surface 4 adjacent to the first 6 and second 7 scales, i.e. it can be shown and hidden as required. The information field 27 shows a retrospective curve of the provided electrical drive power 28 and recuperation power 29 for a distance traveled (s) or a time traveled (t). In addition, a curve of the provided drive power of an electric power take-off 30 and / or a curve of the service brake interventions 31 can optionally be displayed. The respective curves can preferably be shown and hidden by the user as required, i.e. the driver can decide which information should be displayed and which not. In this way, the driver can be shown exactly the information he considers useful at the time, without being distracted by unnecessary information.

[0082] The individual curves can be displayed particularly preferably as a bar chart, preferably as a histogram. For this purpose, the distance / time traveled can be divided into several sections. Fig. 5 has been broken down into five sections. However, there could also be more or fewer sections. The individual columns then correspond to the electric drive power 33, the electric recuperation power 34, the ePTO power and / or the power of other consumers 35, or the service brake interventions 36 across the respective section. For clarity, only two sections have been provided with reference symbols.

[0083] Preferably, the information displayed in the information field 27 is displayed spatially and graphically in relation to the corresponding information of the first scale 6 and the second scale 7. In the example of Fig. 5, the information field 27 is displayed to the side of the first scale 6 and the second scale 7. The zero line of the information field 27 and the 100% markings of the information field are each arranged at the same height. In this way, the driver can establish a connection between the current and the historical values ​​at a glance. In particular, the columns of the information field can be designed as pointers to the first scale 6 and second scale 7, respectively. In other words, in the information field 27, the curve of the drive power 28 is displayed graphically in the form of several pointers 21, preferably bars 33, assigned to the first scale 6. The curve of the recuperation power 29 is displayed graphically in the form of several pointers 21, preferably bars 34, assigned to the second scale 7.

[0084] In the example of Fig. 5, the zero line of the drive power and the zero line of the recuperation power coincide in information field 27. The positive power values ​​extend in opposite directions. Likewise, the curve refers to the same distance / time traveled, and the breakdown into individual sections was performed at the same locations. The bars for drive power 33 and recuperation power 34 can be displayed one above the other and preferably aligned with each other. This provides the user with a particularly clear summary of the historical curve.

[0085] The optional display of the power curve of the ePTO and / or other electrical consumers 30 can preferably be displayed in a corresponding manner next to the drive power curve 28 and / or in spatial association with the first scale 6. Preferably, the bars of the power of the ePTO and / or other electrical consumers 30 are displayed narrower and / or less prominently than the bars of the electric drive power 33.

[0086] Furthermore, one or more average values ​​32 can optionally be displayed. The average values ​​32 can be calculated, for example, for the distance traveled or the time traveled for the electric drive power, the recuperation power and / or the power of the ePTO and / or other consumers. Fig.For example, in Figure 5, an average value of 32 is shown as a dashed line with an associated numerical value. Preferably, additional information can be displayed to provide further information about the precise calculation of the average value of 32.

[0087] Preferably, the course of the service brake interventions 31 can be displayed below the second scale 7. In this way, all bars of the service brake interventions 36 are clearly arranged next to each other, allowing them to be easily compared with each other. Additionally or alternatively, they can be displayed in a corresponding manner and / or in spatial association with the second scale 7. The bars of the non-regenerative service brake interventions 36 can preferably be designed as a tail, the length of which correlates with the strength of the service brake intervention.

[0088] Although the invention has been described with reference to specific embodiments, it will be apparent to one skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. Accordingly, the invention is not intended to be limited to the disclosed embodiments, but is intended to include all embodiments falling within the scope of the appended claims. In particular, the invention also claims protection for the subject matter and features of the dependent claims independent of the claims referred to. In particular, all described embodiments of the first aspect are also intended to be disclosed and claimable for all described embodiments of the second aspect, and vice versa. List of reference symbols 1 display device 2 electric drive 3 Motor vehicle 4 Display area 5 Control device 6 First scale 7 Second scale 8 Instantaneous electric drive power 9 Current electrical recuperation power 10 Temporarily unavailable range of drive power 11 Temporarily unavailable range of recuperation power 13 Zero point of the first and / or second scale 14 First scale end 14a First area 15 Boost range 16 Second scale end 18 Dynamic limit stop of the drive power 19 Electrically operated power take-off 20 Current electrical power of the ePTO and / or other consumers 23 Dynamic end stop recuperation power 24 Service brake 26 Graphic element of the service brake 27 Information field 28 Course of the provided electric drive power 29 Course of the provided recuperation power 30 Course of the drive power ePTO and / or other consumers 31 Course of service brake interventions 32 average value 33 Electric drive power over a time / distance section 34 Recuperation performance over a time / distance section 35 Power of the ePTO and / or consumer over a time / distance section 36 service brake interventions over a time / distance section

Claims

[1] Display device (1) for displaying an electric drive and recuperation power provided by an electric drive (2) of an electrically driven motor vehicle (3), comprising: a display surface (4); and a control device (5) coupled to the display surface (4) for controlling a display of information on the display surface (4), wherein the control device (5) is designed to a) to display on the display surface (4) a first scale (6) for displaying the drive power and a second scale (7) for displaying the recuperation power; b) to display a current electrical drive power (8) on the first scale (6) and a current electrical recuperation power (9) on the second scale (7); and c) adjacent to the first (6) and second (7) scales, optionally displaying an information field (27) on the display surface (4), in which, looking back for a distance traveled or a time traveled, a curve (28) of the provided electrical drive power (28) and / or a curve (29) of the provided electrical recuperation power is shown. [2] Display device (1) according to claim 1, wherein the curve (28) of the provided electrical drive power and / or the curve (29) of the provided electrical recuperation power is / are shown as a bar chart, preferably as a histogram. [3] Display device (1) according to 1 or 2, wherein the control device (5) is designed to display the information displayed in the information field (27) spatially and graphically in relation to the corresponding information of the first scale (6) and second scale (7). [4] Display device (1) according to one of the preceding claims, wherein the control device (5) is designed to display the course (28) of the provided drive power graphically in the information field (27) in the form of several pointers assigned to the first scale (6), preferably designed as bars, and to display the course (29) of the provided recuperation power graphically in the form of several pointers assigned to the second scale (7), preferably designed as bars. [5] Display device (1) according to one of the preceding claims, wherein graphic elements, preferably designed as bars, which are used in the information field (27) to display the drive power (28) and the recuperation power (29) for a specific previous distance or time section, are shown one above the other and preferably in alignment with each other. [6] Display device (1) according to one of the preceding claims, wherein the control device (5) is further designed to display, upon activation of an electrically operated auxiliary drive (19), ePTO (electrical Power Take Off, ePTO), its instantaneous electrical power (20) on the first scale (6) and, retrospectively for the distance traveled or the time traveled, to display a curve of the power of the ePTO (30) in the information field (27). [7] Display device (1) according to claim 6, wherein the control device (5) is designed a) to display the instantaneous drive power (8) and the power of the ePTO (20) side by side on the first scale (6), each with a pointer, preferably with a segmented or continuous bar, wherein the pointer for the power of the ePTO (20) is preferably displayed narrower and / or less prominently than the pointer for the instantaneous drive power (8); and b) to display the curve of the drive power (28) and the curve of the power of the ePTO (30) in a corresponding manner next to one another in the information field (27), and preferably in spatial association with the first scale (6). [8] Display device (1) according to one of the preceding claims; wherein the control device (5) is designed to display in the information field (27) an average value (32) for the distance traveled or the time traveled of the following variables: the electric drive power, the recuperation power and preferably the power of the ePTO according to claim 6 or 7. [9] Display device (1) according to one of the preceding claims, wherein the control device (5) is designed to a) to indicate activation of a non-regenerative service brake (25) on the second scale (7) and / or adjacent to the second scale (7); and b) retrospectively displaying a history of the activation of the non-regenerative service brake (31) in the information field (27) for the distance or time travelled. [10] Display device (1) according to claim 9, wherein the control device (5) is designed a) to indicate the activation of the non-regenerative service brake (24) by means of a graphic element (26), e.g. by means of a symbol or a tail, on the second scale (7) and / or adjacent to the second scale (7); and b) to display the course of the activation of the non-regenerative service brake (31) in the information field (27) in a corresponding manner, and preferably in spatial association with the second scale (7). [11] Display device (1) according to one of the preceding claims, wherein the control device (5) is designed to display a temporarily unavailable range (10) of the drive power on the first scale (6) and / or a temporarily unavailable range (11) of the recuperation power on the second scale (7). [12] Display device (1) according to claim 11, wherein the temporarily unavailable range (10) of the drive power a) is displayed as an area with a different colour, e.g. as a greyed or hidden area, and / or with a different pattern than an available range of drive power on the first scale (6); and / or b) the display of a dynamic end stop for the currently maximum available drive power (18) on the first scale (6). [13] Display device (1) according to one of the preceding claims, wherein the temporarily unavailable range (11) of the recuperation power a) is displayed as an area with a different colour, e.g. as a greyed-out area, and / or a different pattern than an available range of recuperation power on the second scale (7); and / or b) the display of a dynamic end stop for the currently maximum available recuperation power (23) on the second scale (7). [14] Display device (1) according to one of the preceding claims, wherein the control device (5) is designed to display the first scale (6) and the second scale (7) on the display surface (4) in such a way that the first scale (6) and the second scale (7) are arranged one above the other and / or in alignment with each other. [15] Motor vehicle (3), preferably commercial vehicle, comprising a display device (1) according to one of the preceding claims.

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