Method and driver assistance device for assisting a driver when driving on different driving levels

Abstract

The invention relates to a driver assistance device which is designed to assist the driver of a motor vehicle during travel along a driving trajectory by outputting a graphical representation of the driving trajectory on a display unit. The driver assistance device is designed to determine that the driving trajectory comprises a first segment arranged on a first driving plane, and comprises a subsequent second segment arranged on a second driving plane that differs from the first driving plane. The driver assistance device is also designed to highlight the first segment of the driving trajectory in the graphical representation in contrast to the second segment of the driving trajectory.

Description

[0001] Method and driver assistance device for supporting a driver when driving on different driving levels

[0002] The invention relates to a method and a corresponding driver assistance device designed to support the driver of a vehicle when driving on different driving levels.

[0003] A vehicle can have a driver assistance device that is designed to record and store a travel path, in particular a travel trajectory, of the vehicle during a first trip. For example, trajectory data relating to the travel trajectory taken by the vehicle when parking in a parking space in a parking garage can be recorded and stored. The travel trajectory can extend from a first point (e.g. from the entrance to the parking garage) to a second point (e.g. the parking space), wherein the second point may be located on a different travel level (e.g. on a different floor of the parking garage) than the first point. The stored trajectory data relating to the travel trajectory during the first trip can be used to assist the user, in particular the driver, of the vehicle on a corresponding second trip along the stored travel trajectory.The second trip can be another outward journey from the first point to the second point, or a return journey from the second point to the first point.

[0004] Assisting the vehicle user during the second trip may include a graphical representation of the vehicle's trajectory for the second trip on a vehicle screen. Such a graphical representation may be confusing for the user, particularly when driving on multiple levels, which may impair the quality and convenience of the driver assistance device.

[0005] This document deals with the technical problem of increasing the quality and / or comfort of a driver assistance device for supporting the driver of a vehicle when driving along a trajectory, in particular when driving along a recorded trajectory that extends over several driving planes.

[0006] The problem is solved by each of the independent claims. Advantageous embodiments are described, among other things, in the dependent claims. It should be noted that additional features of a patent claim dependent on an independent patent claim can form a separate invention, independent of the combination of all features of the independent patent claim, without the features of the independent patent claim or only in combination with a subset of the features of the independent patent claim, which invention can be made the subject of an independent claim, a divisional application, or a subsequent application. This applies equally to technical teachings described in the description, which can form an invention independent of the features of the independent patent claims.

[0007] According to one aspect, a driver assistance device is described that is designed to assist the driver of a motor vehicle during a journey along a journey trajectory by outputting a graphical representation of the journey trajectory on a display unit. The display unit can comprise, for example, a screen or a head-up display. The display unit can be part of the vehicle or part of a (mobile) user device (e.g., a smartphone).

[0008] The journey may be a second journey that follows a trajectory recorded during a (previous) first journey. The first journey may comprise an outward journey from a first point (e.g., from a starting point) to a second point (e.g., to an end point). The second journey may comprise a corresponding return journey from the second point to the first point. Alternatively, the second journey may comprise a repetition of the first journey (in the same direction of travel). The first journey may thus comprise a journey from the first point to the second point, and the second journey may comprise another journey from the first point to the second point.

[0009] The driver assistance system can be configured to effect automated longitudinal and / or lateral guidance of the vehicle (e.g., during the first journey and / or during the second journey). Automated lateral guidance can be effected, in particular, during the second journey. The longitudinal guidance can then, if necessary, be effected manually by the driver. The driver assistance system can, in particular, be a reversing assistant and / or a property parking assistant. In an alternative example, the second journey can be effected (if necessary, entirely) manually by the driver (with regard to the longitudinal and lateral guidance). During the first journey, trajectory data relating to the trajectory of the first journey can have been determined and recorded. The trajectory data can indicate positions (e.g., within the x, y plane of a Cartesian coordinate system) of a plurality of waypoints on the trajectory recorded during the first journey.The trajectory data may also indicate the course of the trajectory's altitude (as a function of the waypoints). The trajectory data may have been determined based on sensor data from one or more vehicle sensors and / or based on a digital map for the driving area traveled by the motor vehicle.

[0010] The driver assistance device can be configured to determine the driving trajectory for the (second) trip based on the recorded trajectory data (for the first trip).

[0011] The driver assistance device is configured to determine that the driving trajectory has a first segment arranged on a first driving plane and a subsequent second segment (in the direction of travel) arranged on a second driving plane that differs from the first driving plane.

[0012] The first and second driving levels can be arranged such that the first and second driving levels have a distance along the vertical axis (in particular along the z-axis of the Cartesian coordinate system) that is equal to or greater than a height threshold. The height threshold can depend on the height of the motor vehicle. Alternatively or additionally, the height threshold can depend on the typical floor height of different floors of a multi-story parking area (e.g., a parking garage or underground car park).

[0013] Alternatively or additionally, the first and second driving levels can be spaced and / or removed from each other along the vertical axis to such an extent that there is sufficient space between the first and second driving levels for a motor vehicle lane. The first and second driving levels can, in particular, correspond to different floors of a multi-story parking area. Alternatively, the first and second driving levels can correspond to different levels of a traffic junction.

[0014] The driver assistance device is further configured to highlight the first segment of the driving trajectory in the graphical representation compared to the second segment of the driving trajectory. The first segment can be highlighted compared to the second segment by

[0015] • the second segment is hidden or greyed out or displayed transparently; and / or

[0016] • a different colour and / or shade is used for the first segment than for the second segment; and / or

[0017] • a symbol, in particular a directional arrow and / or a traffic sign and / or a pictogram, is displayed which indicates the first segment.

[0018] By highlighting or de-highlighting the graphical representation of a segment located on a different driving level (in particular on a different floor of a parking area), the quality and convenience of the driver assistance device can be increased.

[0019] The driver assistance device can be configured to check whether or not there is an overlap of the first segment and the second segment. In particular, it can be checked whether there is a graphical overlap of the first segment and the second segment within the graphical representation of the travel trajectory (and thus the second segment at least partially covers the first segment (or vice versa)). Alternatively or additionally, it can be checked whether there is an overlap of the first segment and the second segment of the travel trajectory along the vertical axis, such that one or more positions (in particular waypoints) of the first segment and one or more positions (in particular waypoints) of the second segment of the travel trajectory lie one above the other along the vertical axis.

[0020] The first segment of the driving trajectory can be highlighted in the graphical representation compared to the second segment of the driving trajectory if it is determined, in particular only if it is determined that the first segment and the second segment overlap. This can further increase the quality and convenience of the driver assistance system.

[0021] The driver assistance device can be configured to determine the course of the altitude of the travel trajectory along the path of the travel trajectory (where the path typically runs within the (x, y) plane of the Cartesian coordinate system, and the individual waypoints of the path are arranged within the (x, y) plane of the Cartesian coordinate system). The course of the altitude of the travel trajectory can be determined based on the trajectory data for the previous (first) trip. The inclination and / or gradient sensor of the motor vehicle can be used to record the trajectory data. Alternatively or additionally, the course of the altitude of the travel trajectory can be determined based on the digital map for the driving area traveled by the motor vehicle.

[0022] The driver assistance device can further be configured to determine, based on the profile of the height of the travel trajectory, that the travel trajectory has a first segment arranged on a first travel plane and a subsequent second segment arranged on a second travel plane. For this purpose, the driver assistance device can be configured to compare the profile of the height of the travel trajectory with the height threshold value. It can then be determined in a particularly precise manner based on the comparison that the travel trajectory has a first segment arranged on a first travel plane and a subsequent second segment arranged on a second travel plane.

[0023] The driver assistance device can be configured, in particular, to determine a position (in particular a waypoint) on the route of the travel trajectory at (in particular from) which the altitude of the travel trajectory is equal to or greater than the altitude threshold. The travel trajectory can then be divided into the first segment and the second segment in a particularly precise manner based on, in particular, the determined position. The determined position (in particular the determined waypoint) can correspond to the boundary between the first segment and the second segment.

[0024] By taking the height of the driving trajectory into account, the different driving levels of the driving trajectory can be identified in a particularly robust and precise manner. This further increases the quality and comfort of driver assistance.

[0025] The driver assistance device can be configured to acquire image data relating to the surroundings of the vehicle in front of the vehicle in the direction of travel using at least one (surroundings) camera of the vehicle while driving. Based on the image data, the graphical representation of the driving trajectory can then be superimposed on the display unit with a representation of the surroundings of the vehicle in front of the vehicle in the direction of travel. This can further enhance the quality and convenience of the driver assistance.

[0026] The driver assistance device can be configured to generate a bird's-eye view of the driving trajectory as a graphical representation, in particular based on sensor data from one or more environmental sensors of the motor vehicle and / or on the trajectory data and / or on the driving trajectory. Alternatively or additionally, a side view of the driving trajectory can be generated as a graphical representation, showing the course of the driving trajectory's altitude.

[0027] The driver assistance device can be configured to allow the driver to switch between the top view and the side view. In the top view and the side view, the first segment of the driving trajectory can be highlighted over the second segment. Consistent switching between different views can further enhance the quality and convenience of the driver assistance.

[0028] The driver assistance device can be configured to detect during travel that the motor vehicle has reached a position (in particular a waypoint) along the route of the travel trajectory from which the transition from the first travel level to the second travel level occurs (and thus the travel trajectory ascends or descends). For example, it can be detected that the altitude of the travel trajectory is ascending or descending (and possibly has a gradient whose magnitude is equal to or greater than a predefined gradient threshold value). In response to the detection, the emphasis of the first segment compared to the second segment can be reduced, in particular eliminated. In this way, the quality and comfort of the driver assistance can be further increased.

[0029] When evaluating the gradient of the driving trajectory, one or more short-term changes in the gradient (e.g., due to one or more speed bumps) can be detected. If a short-term change in the gradient is detected, it may be possible to prevent the first segment from being emphasized more than the second segment. This can further enhance the quality and comfort of the driver assistance system.

[0030] According to a further aspect, a (road) motor vehicle (in particular a passenger car or a truck or a bus or a motorcycle) is described which comprises the driver assistance device described in this document.

[0031] According to a further aspect, a method is described for assisting the driver of a motor vehicle during travel along a travel trajectory by outputting a graphical representation of the travel trajectory on a display unit. The method comprises determining that the travel trajectory has a first segment arranged on a first travel plane and a subsequent second segment arranged on a second travel plane that differs from the first travel plane. Furthermore, the method comprises highlighting the first segment of the travel trajectory in the graphical representation compared to the second segment of the travel trajectory.

[0032] It should be noted that the aspects described in connection with the device, in particular the claims described in connection with the device, are also to be applied to the method as corresponding method features.

[0033] According to a further aspect, a software (SW) program is described. The SW program can be configured to be executed on a processor (e.g., on a control unit of a vehicle) and thereby to perform at least one of the methods described in this document.

[0034] According to a further aspect, a storage medium is described. The storage medium can comprise a software program configured to be executed on a processor and thereby to carry out at least one of the methods described in this document.

[0035] It should be noted that the methods, devices, and systems described in this document can be used both alone and in combination with other methods, devices, and systems described in this document. Furthermore, any aspects of the methods, devices, and systems described in this document can be combined in a variety of ways. In particular, the features of the claims can be combined in a variety of ways. Furthermore, features listed in parentheses are to be understood as optional features.

[0036] The invention will be described in more detail below using exemplary embodiments.

[0037] Figure 1 shows exemplary components of a vehicle;

[0038] Figure 2a different floors of a multi-story parking area as an example of a driving area with several driving levels;

[0039] Figure 2b shows an exemplary driving trajectory extending over several driving levels;

[0040] Figure 2c shows an exemplary graphical representation of the driving trajectory from Fig. 2b from a bird's eye view;

[0041] Figure 2d shows an exemplary graphical representation of the driving trajectory from Fig. 2b in a side view;

[0042] Figure 3a shows an exemplary graphical representation of the driving trajectory from Fig. 2b with a highlighted first segment;

[0043] Figure 3b is an exemplary graphical representation of the driving trajectory from Fig. 2b with a highlighted first segment; and

[0044] Figure 4 is a flowchart of an exemplary method for assisting a vehicle user during a journey along a journey trajectory.

[0045] As stated at the outset, this document deals with increasing the quality and / or comfort of a driving assistance device, in particular with regard to the vehicle's driving trajectory displayed during a journey.

[0046] Fig. 1 shows an exemplary vehicle 100 with one or more environment sensors

[0047] 102 (e.g., a camera, a radar sensor, a lidar sensor, etc.) and one or more vehicle sensors 103 (e.g., a steering sensor, a speed sensor, an inertial measurement unit (IMU), etc.). A (control) device 101 of the vehicle 100 can be configured to acquire trajectory data relating to the travel trajectory followed during the first trip based on the sensor data of the one or more environmental sensors 102 and / or based on the one or more vehicle sensors 103 during a first trip (e.g., during a maneuvering maneuver) and to store the data in a memory unit (not shown) of the vehicle 100.

[0048] The vehicle 100 may further comprise one or more longitudinal and / or lateral guidance actuators 104 configured to effect at least partially automated longitudinal and / or lateral guidance of the vehicle 100. Examples of actuators 104 include a drive motor, a steering device, and / or a braking device. The (control) device 101 may be configured to control the one or more actuators 104 during a second journey based on the trajectory data relating to the first journey in order to assist the driver of the vehicle 100 during the return journey.

[0049] Furthermore, the vehicle 100 comprises a display unit 105, which is arranged, for example, on the dashboard and / or on the head unit of the vehicle 100. The display unit 105 can comprise a screen (in particular an LCD, LED, or OLED screen), a projector, and / or a head-up display. The device 101 can be configured to cause image data from a camera 102 of the vehicle 100 to be displayed on the display unit 105 during a second journey. In particular, the surroundings lying in front of the vehicle 100 in the direction of travel can be displayed (in the form of a video).

[0050] The device 101 can further be configured to determine a travel trajectory for the second trip based on the trajectory data acquired during the first trip and to display it visually on the display unit 105, overlaying it with the image data from the camera 102 of the vehicle 100. The displayed travel trajectory (also referred to in this document as the display trajectory) can indicate to the user, in particular the driver, of the vehicle 100 how the vehicle 100 should be guided longitudinally and / or transversely during the second trip, in particular in order to guide the vehicle 100 along the recorded travel trajectory. The longitudinal and / or transverse guidance of the vehicle 100 during the second trip can be effected automatically by the vehicle 100 or manually by the driver.If the longitudinal and / or lateral guidance of the vehicle 100 is effected automatically by the vehicle 100, the displayed driving trajectory can provide support for the driver in monitoring the automated longitudinal and / or lateral guidance. If the longitudinal and / or lateral guidance is effected manually by the driver, the displayed driving trajectory can be used by the driver as a reference point for the longitudinal and / or lateral guidance to be effected by the driver.

[0051] As shown in Fig. 2a, the vehicle 100 can enter the parking area 200 on a first floor 201 of a multi-story parking area 200. The vehicle 100 can then, if necessary, drive via a ramp 202 to another (second) floor 201 of the parking area 200, on which a parking area with parking spaces is located. The vehicle 100 can be parked in a parking space on the second floor 201 of the parking area 200.

[0052] The multi-story parking area shown in Fig. 2a is an example of a driving area 200 of the vehicle 100, which has several different driving levels 201 (e.g. floors). A parking area 201 used by the vehicle 100 in such a driving area

[0053] 200 driven trajectory can thus extend over different driving levels

[0054] 201.

[0055] Fig. 2b shows an exemplary travel trajectory 210 for a trip 213 of the vehicle 100, extending from a first point 211 to a second point 212. The circular section of the travel trajectory 210 may correspond to a change of the travel plane 201 from a first travel plane 201 to a second travel plane 201. The travel trajectory 210 may have been recorded during a first trip and stored in a memory unit of the vehicle 100. Alternatively, the travel trajectory 210 may have been determined for a trip of the vehicle 100 (e.g., based on the sensor data of the one or more environmental sensors 102 of the vehicle 100 and / or based on a digital map for the travel area 200).

[0056] Figures 2c and 2d show exemplary graphical representations 220, 230 of the travel trajectory 210. In particular, Fig. 2c shows a top view of the travel trajectory 210 and of the vehicle 100. Fig. 2d shows a side view of the travel trajectory 210 and the vehicle 100.

[0057] From Fig. 2c, it can be seen that, in the case of a driving trajectory 210 that extends across multiple driving planes 201, the top view in particular can be confusing for the user of the vehicle 100, since multiple segments 221, 222 of the driving trajectory 210 overlap. In particular, a portion of the first segment 221 of the driving trajectory 210, which runs on a first driving plane 201, can be obscured by a portion of the second segment 222 of the driving trajectory 210, which runs on a different second driving plane 201. This can be perceived as confusing by a user of the vehicle 100, thereby impairing the quality and / or comfort of the driver assistance device 101.

[0058] The (driver assistance) device 101 can be configured to recognize that a driving trajectory 210 to be displayed extends over a plurality of driving planes 201. In particular, the device 101 can be configured to recognize that the driving trajectory 210 to be displayed has a first segment 221 that runs in a first driving plane 201 and a subsequent second segment 222 that runs in a second driving plane 201 (which differs from the first driving plane 201). It can then be caused that the first segment 221 is highlighted in the graphic representation 220, 230 compared to the second segment 222. This is illustrated by way of example in Figures 3a and 3b, wherein Fig. 3a shows a top view (corresponding to Fig. 2c) and Fig. 3b shows a side view (corresponding to Fig. 2d).In Figures 3a and 3b, the second segment 222 is shown as a dotted line, while the first segment 221 is shown as a solid line to distinguish the first segment 221 from the second segment 222. Thus, the driving trajectory 210 of the vehicle 100 can be clearly displayed on the display unit 105 of the vehicle 100, thereby increasing the quality and / or convenience of the driver assistance device 101.

[0059] The device 101 can be configured to check whether the first segment 221 and the second segment 222 overlap and / or overlap. In particular, it can be checked whether a subsequent (second) segment 222 overlaps the first segment 221. In such a case, the first segment 221 can be highlighted relative to the second segment 222 (and, if applicable, relative to all subsequent segments of the trajectory 210). In particular, the second segment 222 (and, if applicable, the one or more subsequent segments) can be hidden.

[0060] The device 101 can be configured to analyze the altitude of the travel trajectory 210 of the vehicle 100. The altitude of the travel trajectory 210 refers to the vertical axis of the vehicle 100 and / or to the z-axis of a Cartesian coordinate system. In particular, the course of the altitude of the travel trajectory 210 can be analyzed as a function of the position or waypoints of the vehicle 100 within the plane of the Cartesian coordinate system spanned by the x- and y-axes. The travel trajectory 210 can, if necessary, specify a value of the altitude along the z-axis for each (x, y) position (i.e., for each waypoint) of the travel trajectory 210. Based on the course of the altitude of the travel trajectory 210, it can be recognized that a change from a first travel plane 201 to a second travel plane 201 occurs along the travel trajectory 210. For example, the altitude of the travel trajectory 210 can be compared with an altitude threshold.As long as the altitude is less than the altitude threshold, it can be determined that the travel trajectory 210 runs in the first travel plane 201. As soon as the altitude is equal to or greater than the altitude threshold, it can be determined that the travel trajectory 210 has switched to the second travel plane 201. At this position (i.e., waypoint), the first segment 221 of the travel trajectory 210 can end, and / or at this position (i.e., waypoint), the second segment 222 of the travel trajectory 210 can begin.

[0061] The height threshold may depend on the (construction) height of the vehicle 100. Alternatively or additionally, the height threshold may depend on a typical distance between consecutive floors of a multi-story parking area.

[0062] The altitude of the travel trajectory 210 can be determined during the recording of the travel trajectory 210 using an inclination sensor and / or a gradient sensor 103 of the vehicle 100. Alternatively or additionally, the altitude of the travel trajectory 210 can be determined based on a digital map for the travel area 200 traveled by the vehicle 100.

[0063] As already explained, the device 101 can be configured to highlight the first segment 221 (which is initially traveled by the vehicle 100) compared to the second segment 222 (which is only traveled by the vehicle 100 after the first segment 221). The highlighting can be effected by hiding the second segment 222 (and one or more further subsequent segments). Fig. 4 shows a flowchart of a (possibly computer-implemented) method 400 for assisting the driver of a motor vehicle 100 during a journey 213 along a journey trajectory 210 by outputting a graphic representation 220, 230 of the journey trajectory 210 on a display unit 105 (of the motor vehicle 100). The method 400 can be executed by a (control) device 101 of the motor vehicle 100.

[0064] The journey 213 can be a repeat journey (in the same or opposite direction) of a previously identified driving maneuver. Trajectory data relating to the distance traveled during the driving maneuver (including the elevation of the distance traveled) can be recorded. The journey trajectory 210 can be determined based on the recorded trajectory data.

[0065] The method 400 includes determining 401 that the travel trajectory 210 has a first segment 221 located on a first travel level 201 and a subsequent second segment 222 located on a second travel level 201 that is different from the first travel level 201. The different travel levels 201 may correspond to different floors of a multi-story parking area. Alternatively, the different travel levels 201 may correspond to different levels of roadways of a traffic intersection.

[0066] Furthermore, the method 400 comprises highlighting 402 the first segment 221 of the travel trajectory 210 in the graphical representation 220, 230 compared to the second segment 222 of the travel trajectory 210. The highlighting 402 can be effected by hiding the second segment 222 (at least temporarily).

[0067] The measures described in this document can increase the comfort and reliability of a driver assistance device. The present invention is not limited to the exemplary embodiments shown. In particular, it should be noted that the description and the figures are intended only to illustrate the principle of the proposed methods, devices, and systems by way of example.

Claims

Claims 1) Driver assistance device (101) which is designed to assist a driver of a motor vehicle (100) during a journey (213) along a journey trajectory (210) by outputting a graphic representation (220, 230) of the journey trajectory (210) on a display unit (105); wherein the driver assistance device (101) is configured - to determine that the travel trajectory (210) has a first segment (221) arranged on a first travel plane (201) and a subsequent second segment (222) arranged on a second travel plane (201) that is different from the first travel plane (201); and - to highlight the first segment (221) of the travel trajectory (210) in the graphic representation (220, 230) compared to the second segment (222) of the travel trajectory (210). 2) Driver assistance device (101) according to claim 1, wherein the driver assistance device (101) is configured - to check whether there is an overlap of the first segment (221) and the second segment (222); and - to highlight the first segment (221) of the travel trajectory (210) in the graphic representation (220, 230) compared to the second segment (222) of the travel trajectory (210) if it is determined, in particular only if it is determined, that there is an overlap of the first segment (221) and the second segment (222). 3) Driver assistance device (101) according to claim 2, wherein the driver assistance device (101) is configured to check whether - a graphical superposition of the first segment (221) and the second segment (222) is present within the graphical representation (220, 230) of the travel trajectory (210); and / or - there is an overlay of the first segment (221) and the second segment (222) of the travel trajectory (210) along a vertical axis, so that one or more positions of the first segment (221) and one or more positions of the second segment (222) of the travel trajectory (210) lie one above the other along the vertical axis. 4) Driver assistance device (101) according to one of the preceding claims, wherein the driver assistance device (101) is configured - to determine a course of a height of the travel trajectory (210) along a path of the travel trajectory (210); and - to determine, on the basis of the profile of the height of the travel trajectory (210), that the travel trajectory (210) has a first segment (221) arranged on a first travel plane (201) and a subsequent second segment (222) arranged on a second travel plane (201). 5) Driver assistance device (101) according to claim 4, wherein the driver assistance device (101) is configured - to compare the course of the altitude of the travel trajectory (210) with a height threshold value; and - to determine on the basis of the comparison that the travel trajectory (210) has a first segment (221) arranged on a first travel plane (201) and a subsequent second segment (222) arranged on a second travel plane (201). 6) Driver assistance device (101) according to one of claims 4 to 5, wherein the driver assistance device (101) is configured - to determine the course of the height of the travel trajectory (210) on the basis of trajectory data which were recorded during a previous journey of the motor vehicle (100), in particular Use of an inclination and / or gradient sensor (103) of the motor vehicle (100); and / or - to determine the course of the height of the travel trajectory (210) on the basis of a digital map for a travel area (200) traveled by the motor vehicle (100). 7) Driver assistance device (101) according to one of claims 4 to 6, wherein the driver assistance device (101) is configured - to determine a position on the route of the travel trajectory (210) at which the course of the altitude of the travel trajectory (210) is equal to or greater than the altitude threshold value; and - to divide the travel trajectory (210) into the first segment (221) and the second segment (222) on the basis, in particular, of the determined position. 8) Driver assistance device (101) according to one of claims 4 to 7, wherein - the height threshold depends on a height of the motor vehicle (100); and / or - the height threshold depends on a typical floor height of different floors of a multi-story parking area. 9) Driver assistance device (101) according to one of the preceding claims, wherein the driver assistance device (101) is configured to emphasize the first segment (221) relative to the second segment (222) in that - the second segment (222) is hidden or greyed out or displayed transparently; - a different color and / or shade is used for the first segment (221) than for the second segment (222); and / or a symbol, in particular a directional arrow and / or a traffic sign and / or a pictogram, is displayed which indicates the first segment (221). 10) Driver assistance device (101) according to one of the preceding claims, wherein the driver assistance device (101) is configured, during the journey (213), - using at least one camera (102) of the vehicle (100), to determine image data relating to an environment of the vehicle (100) lying in front of the vehicle (100) in the direction of travel; and - on the basis of the image data, to cause the graphic representation (220, 230) of the travel trajectory (210) to be superimposed on the display unit (105) with a representation of the surroundings of the vehicle (100) lying in front of the vehicle (100) in the direction of travel. 11) Driver assistance device (101) according to one of the preceding claims, wherein the driver assistance device (101) is configured, in particular on the basis of sensor data from one or more environmental sensors (102), - to generate a top view of the travel trajectory (210) from a bird's eye view as a graphic representation (220); and / or - to generate a side view of the travel trajectory (210) as a graphic representation (230), from which a course of a height of the travel trajectory (210) emerges. 12) Driver assistance device (101) according to claim 11, wherein the driver assistance device (101) is configured to enable the driver to switch between the top view and the side view; wherein in the top view and in the side view, the first segment (221) is opposite the second segment (222) of the driving trajectory (210) is highlighted. 13) Driver assistance device (101) according to one of the preceding claims, wherein the driver assistance device (101) is configured - to detect during the journey (213) that the motor vehicle (100) has reached a position along a path of the travel trajectory (210) from which a transition from the first driving plane (201) to the second driving plane (202) takes place; and - in response to the detection, to cause the highlighting of the first segment (221) relative to the second segment (222) to be reduced, in particular to be cancelled. 14) Driver assistance device (101) according to one of the preceding claims, wherein - the first and second travel planes (201) have a distance along a vertical axis that is equal to or greater than a height threshold; and / or - the first and second driving levels (201) are spaced apart along the vertical axis to such an extent that there is sufficient space between the first and second driving levels (201) for a roadway for motor vehicles; and / or - the first and second travel levels (201) correspond to different floors of a multi-level parking area; and / or - the first and second driving levels (201) correspond to different levels of a traffic junction. 15) Driver assistance device (101) according to one of the preceding claims, wherein the driver assistance device (101) is configured to guide the motor vehicle (100) longitudinally and / or transversely along the travel trajectory (210) during the journey (213) at least partially or completely automatically. 16) Method (400) for assisting a driver of a motor vehicle (100) during a journey (213) along a journey trajectory (210) by outputting a graphical representation (220, 230) of the journey trajectory (210) on a display unit (105); wherein the method (400) comprises - determining (401) that the journey trajectory (210) has a first segment (221) arranged on a first driving plane (201), and a subsequent second segment (222) arranged on a second driving plane (201) that differs from the first driving plane (201); and - highlighting (402) the first segment (221) of the driving trajectory (210) in the graphical representation (220, 230) compared to the second Segment (222) of the travel trajectory (210).

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