Device and method for adjusting vehicle headlights

Abstract

The invention relates to a device (12) for adjusting vehicle headlights (4) of a motor vehicle (1), comprising a U-shaped adjustment frame (13) having two side webs (15) and a central web (16) connecting the two side webs (15) to each other, comprising a laser device (14) for generating a laser line (21), wherein the two side webs (15) form a left side web (15.1) configured for mounting on a left wheel hub (17.1) of a left rear wheel (8.1) of the motor vehicle (1), and a right side web (15.2) configured for mounting on a right wheel hub (17.2) of a right rear wheel (8.1).2) of the motor vehicle (1),- wherein the central web (16) has a central web longitudinal direction (20) and is arranged on the two side webs (15) such that the central web longitudinal direction (20) extends parallel to a rear axle (9) of the motor vehicle (1) defined by the two wheel hubs (17) when the side webs (15) are properly mounted on the two wheel hubs (17),- wherein the laser device (14) is attached to the central web (16) such that when the laser device (14) is switched on, the laser line (21) extends perpendicular to the central web longitudinal direction (20),- wherein the laser device (14) is adjustably attached to the central web (16) in the central web longitudinal direction (20) along the central web (16).

Description

The present invention relates to a device and a method for adjusting the headlights of a motor vehicle. Ideally, the headlights of a motor vehicle should be adjusted so that they emit light parallel to the vehicle's direction of travel. However, assembly tolerances mean that immediately after the headlights are mounted, the direction of light emission can deviate to a greater or lesser extent from the direction of travel. Furthermore, tolerances in the mounting of the vehicle's wheels can cause the vehicle's axis of rotation to deviate from its longitudinal axis, resulting in a non-zero angle between the axis and the longitudinal axis. These tolerances can lead to the headlights' direction of light emission deviating from the vehicle's direction of travel immediately after assembly.Accordingly, the vehicle headlights must be adjusted after the vehicle has been installed, so that the direction of the headlight beam is aligned parallel to the direction of travel. From EP 1 016 873 A2, a device for adjusting a distance sensor or a headlight of a motor vehicle is known, wherein the device has two laser elements that are mounted on the rear wheels and project laser beams onto a reflector arranged in front of the vehicle. The driving axis can be determined from the light beams incident on the projector, and the headlight or the distance sensor can then be adjusted based on this driving axis. US Patent 4,134,680 A discloses a testing device for testing and adjusting a vehicle's headlight in relation to the actual driving axis. The testing device can be calibrated using light sources mounted on the rear wheels. US Patent 5,920,386 A discloses another device for adjusting a vehicle's headlight, wherein the device has a U-shaped frame on which a unit for detecting a headlight beam is slidably mounted. The slidability of the unit allows it to be positioned relative to the headlight being adjusted. US Patent 3,841,759 A discloses a device for adjusting the headlights of a motor vehicle, wherein the device has a platform on which the vehicle can be positioned and a detection unit for each headlight, which is coupled to the respective headlight and by which deviations from the driving axis of the vehicle can be determined. The known devices and methods for adjusting the headlights of a motor vehicle require a comparatively large amount of equipment. The present invention addresses the problem of providing an improved or at least a different embodiment of a device and a method for adjusting the headlights of a motor vehicle, which is characterized in particular by reduced equipment costs and at the same time enables the most precise possible adjustment of the respective headlight. This problem is solved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims. The invention is based on the general concept of generating a laser line perpendicular to the rear axle of the vehicle using a laser device. The laser line is aligned so that it passes through the center of the headlight being adjusted. A reference image can then be generated using the headlight being adjusted. By adjusting the headlight, a reference mark on the reference image is aligned with the laser line. The laser line, aligned with the center of the headlight, represents the direction of travel of the rear axle without requiring any measurement of the rear axle, thus eliminating the need to determine the axle angle. By aligning the reference mark of the reference image with the laser line, the emission direction of the respective headlight is aligned parallel to the laser line and therefore parallel to the direction of travel.The associated equipment costs are comparatively low. Specifically, the invention proposes a device for adjusting the headlights of a motor vehicle, comprising a U-shaped adjustment frame and a laser device for generating a laser line. The adjustment frame has two side supports and a central support connecting the two side supports. The two side supports form a left side support and a right side support. The left side support is configured to be mounted on the left wheel hub of a left rear wheel of the motor vehicle, such that it assumes a predetermined relative position to the left wheel hub. The right side support is configured to be mounted on the right wheel hub of a right rear wheel of the motor vehicle, such that it assumes a predetermined relative position to the right wheel hub.The central web has a longitudinal axis and is arranged on the two side webs such that, when the two side webs are properly mounted on the wheel hubs, the longitudinal axis of the central web extends parallel to the rear axle of the motor vehicle. In other words, the adjustment frame is configured to be self-aligning, since, when the side webs are properly mounted on the wheel hubs, it automatically and necessarily aligns itself so that the longitudinal axis of the central web extends parallel to the rear axle. Furthermore, in the device according to the invention, the laser device is mounted on the central web such that, when the laser device is switched on, the laser line extends perpendicular to the longitudinal axis of the central web. Thus, the laser line extends parallel to the direction of travel of the rear wheels.Furthermore, the device according to the invention provides that the laser device is adjustable along the central web in the longitudinal direction. This allows the laser device to be adjusted along the central web, provided the side webs are properly mounted on the two wheel hubs, and thus aligned with respect to the vehicle headlight to be adjusted, until the laser line passes through the center of the respective vehicle headlight. In the present context, a “configuration” is synonymous with a “design” and / or “setup” and / or “programming”, so that the phrase “configured so that” is synonymous with the phrase “designed so that” and / or “set up so that” and / or “programmed so that”. According to an advantageous embodiment, the adjustment frame can be configured such that, with the side supports properly mounted on the two wheel hubs, the longitudinal direction of the center support runs along the vehicle's transverse direction. Consequently, the laser device can be adjusted on the center support essentially in the vehicle's transverse direction. This simplifies the alignment of the laser line with the respective headlight center. According to an advantageous embodiment, the laser device can be configured to emit a laser beam that generates the laser line. For example, the laser beam strikes a floor and / or a wall, generating the laser line there. The laser beam extends perpendicular to the longitudinal direction of the center support or perpendicular to the rear axle. In particular, the laser beam or laser line extends in a laser plane that is perpendicular to the rear axle or perpendicular to the longitudinal direction of the center support. Furthermore, the adjustment frame and the laser device can be coordinated such that, when the laser device is switched on, the laser beam strikes the floor in front of the vehicle from above, so that the laser line runs along the floor.This allows the reference mark on the ground to be aligned directly with the laser line when adjusting the respective vehicle headlight, eliminating the need for a separate projection surface onto which the reference image and the laser line would otherwise have to be projected to align the reference mark with the laser line. This measure reduces the effort required for adjusting the vehicle headlight. According to an advantageous embodiment, the adjustment frame and the laser device can be coordinated so that, when the laser device is switched on, the laser beam strikes the front area of ​​the vehicle, which includes the respective headlight, from above, so that the laser line also runs along the front area. This makes it particularly easy to align the laser line with the center of the headlight. According to an advantageous embodiment, the central web may have a linear guide rail extending parallel to its longitudinal direction, on which the laser device is adjustably mounted along the central web. This allows the laser device to be adjusted particularly easily and with high precision along the central web to achieve the desired alignment of the laser line with the respective headlight center. A method according to the invention for adjusting the headlights of a motor vehicle utilizes a device of the type described above. In this method, the two side brackets are mounted on the two wheel hubs, which automatically and necessarily aligns the central bracket parallel to the rear axle of the motor vehicle. Subsequently, the laser device is switched on and adjusted along the central bracket until the laser line passes through the center of the headlight being adjusted. The headlight center is, in particular, the geometric and / or optical center of the respective headlight with respect to the transverse direction of the vehicle.The center of the headlight is characterized in particular by the area of ​​the respective vehicle headlight where the central and main light emission occurs. Specifically, the center of the headlight, with respect to the vehicle's transverse direction, represents the position of the optical axis of the respective vehicle headlight along which it emits its light. Before, during, or after aligning the laser line with the center of the headlight being adjusted, the headlight can be switched on and activated to generate a reference image. Modern headlights, especially matrix headlights, can be activated to project a reference image. This reference image can include at least one reference mark, such as a crosshair. Once the headlight is generating the reference image, it can be adjusted until a reference mark on the image aligns with the laser line. Adjusting the headlight involves changing its beam direction relative to the vehicle and its longitudinal axis.The adjustment of each vehicle headlight is achieved by shifting the reference image relative to the laser line in the vehicle's transverse direction. This also shifts the corresponding reference mark in the vehicle's transverse direction with respect to the laser line. The headlight is adjusted until the reference mark lies as precisely as possible on the laser line. For example, a crosshair can be aligned as accurately as possible with the laser line as a reference mark. Adjusting each headlight also changes its beam direction, or optical axis, relative to the vehicle's longitudinal direction. This can be accomplished by adjusting a light source within the headlight housing, which emits the light, relative to the housing.It is also conceivable to adjust the housing of the vehicle headlight relative to the motor vehicle or relative to the body of the motor vehicle into which the vehicle headlight is installed. The vehicle in question expediently has two headlights, designated as a first headlight and a second headlight. These two headlights are expediently front headlights and also form a left headlight and a right headlight. The procedure can be carried out as follows: to align the first headlight, the laser device is moved along the center rib until the laser line passes through the center of the first headlight. The first headlight is switched on and activated to generate the reference image, and then adjusted so that the reference mark of the reference image lies on the laser line. The achieved setting is then fixed in a suitable manner.Then, to adjust the second headlight, the same laser device can be moved along the center rib until the laser line passes through the center of the second headlight. The second headlight is then switched on and activated to generate the reference image. It is then adjusted so that the reference mark of the reference image lies on the laser line. The setting is then properly fixed. Both headlights of the vehicle are now adjusted. According to an advantageous embodiment, the vehicle headlight can be controlled in such a way that the reference image is generated on the ground in front of the vehicle. Furthermore, the laser device can be configured so that the laser line also runs along the ground. This allows the reference mark of the reference image to be aligned directly with the laser line on the ground. This simplifies the implementation of the method. In an alternative embodiment, the vehicle's headlights can be controlled in such a way that the reference image is generated on a wall in front of which the vehicle is parked. Furthermore, the laser device can be configured so that the laser line also runs along the wall. In this way, it is possible to align the reference mark on the wall with the laser line. In particular, this allows an existing infrastructure, namely the aforementioned wall, to continue to be used for adjusting the vehicle's headlights. In an alternative embodiment, the vehicle's headlights can be controlled in such a way that the reference image is generated on a wall surface of a light-collecting box in front of which the vehicle is positioned. Furthermore, the laser device can be configured so that the laser line also runs along the wall surface. Consequently, the reference marking on the wall surface can be aligned with the laser line. This embodiment of the method also allows the use of any existing infrastructure, in this case, the light-collecting box. Further important features and advantages of the invention will become apparent from the dependent claims, the drawings and the associated description of the figures based on the drawings. It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention as defined by the claims. Components of a higher-level unit, such as a device, apparatus, or arrangement, mentioned above and those to be mentioned below, which are designated separately, can form separate parts or components of this unit or be integral areas or sections of this unit, even if this is depicted differently in the drawings. Preferred embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein identical reference numerals refer to identical or similar or functionally identical components. Figure 1 shows a highly simplified basic top view of a motor vehicle, Figure 2 a rear view of a motor vehicle with a device for adjusting vehicle headlights, Figure 3 a side view of the motor vehicle with the device, Figure 4 a top view of the motor vehicle with the device before adjusting the respective vehicle headlight, Figure 5 a top view as in Figure 4, but after adjusting the respective vehicle headlight, and Figure 6 a flowchart of a method for adjusting vehicle headlights. As shown in Fig. 1, a motor vehicle 1, which may in particular be a passenger car, comprises a body 2 on which two headlights 4 are mounted in a front section 3. The motor vehicle 1 also has two front wheels 5 in the front section 3, which define a front axle 6. Furthermore, the motor vehicle 1 has two rear wheels 8 in a rear section 7, which define a rear axle 9. The motor vehicle 1 has a longitudinal direction X, a transverse direction Y, and a vertical direction Z, which are perpendicular to each other. The rear axle 9 defines a direction of travel 10, which is perpendicular to the rear axle 9. Due to manufacturing tolerances, a driving axis angle 11 may form between the longitudinal direction X and the direction of travel 10, which is exaggerated in Fig. 1.In order for the vehicle headlights 4 to emit their light parallel to the direction of travel 10, they must be adjusted accordingly. For particularly easy adjustment of the vehicle headlights 4, a device 12, which is explained in more detail below with reference to Figs. 2, 3, 4 to 5, can be used. With this device 12, a method 26 for adjusting the vehicle headlights 4 can be carried out, which is explained in more detail below with reference to Fig. 6. As shown in Figures 2, 3, 4 to 5, the device 12, configured for adjusting the headlights 4 of the motor vehicle 1, comprises an adjustment frame 13 and a laser device 14. The adjustment frame 13 is U-shaped. In the view shown in Figure 2, the "U" of the U-shaped adjustment frame 13 is upside down and therefore open downwards instead of upwards. The adjustment frame 13 has two side struts 15 and a central strut 16 that connects the two side struts 15. The two side struts 15 form a left or first side strut 15.1 and a right or second side strut 15.2. The side struts 15 are configured for mounting on the rear wheels 8. The two rear wheels 8 each have a wheel hub 17 and form a left or first rear wheel 8.1 and a right or second rear wheel 8.2. The two wheel hubs 17 accordingly form a left or first wheel hub 17.1 on the left rear wheel 8.1 as well as a right or second wheel hub 17.2 on the right rear wheel 8.2. The left side link 15.1 is configured for mounting on the left wheel hub 17.1. The right side link 15.2 is configured for mounting on the right wheel hub 17.2. For example, each side link 15 can have a hub coupling 18 that can be easily and precisely attached to the respective wheel hub 17. The respective hub coupling 18 can be movably mounted on the respective side link 15, in particular via a ball joint 19. In the preferred example, the hub couplings 18 or the ball joints 19 are located at a lower end of the respective side link 15, while the center link 16 connects the two side links 15 at their upper ends. The two side links 15 and the center link 16 are each configured straight. The central web 16 has a central web longitudinal direction 20. The central web 16 is arranged on the two side webs 15 such that the central web longitudinal direction 20 is aligned parallel to the rear axle 9 when the two side webs 15 are properly mounted on the two wheel hubs 10. The laser device 14 is configured to generate a laser line 21, as shown in Figures 4 and 5. For this purpose, the laser device 14 generates a laser beam 22, as shown in Figures 2 and 3, which creates the laser line 21 at its point of impact. For example, the laser device 14 can be arranged such that the laser beam 22 strikes a surface 23 on which the vehicle 1 is standing. As a result, the laser line 21 is generated on this surface 23. Furthermore, the laser device 14 is mounted on the central support 16 in such a way that, when the laser device 14 is switched on, the laser line 21 extends perpendicular to the longitudinal direction 20 of the central support. Thus, the laser line 21 extends perpendicular to the rear axle 9 and therefore parallel to the direction of travel 10. In addition, the laser device 14 is adjustably mounted on the central web 16, such that the laser device 14 can be adjusted in the longitudinal direction 20 along the central web 16.This adjustability of the laser device 14 with respect to the central web 16 in the longitudinal direction 20 of the central web is indicated by a double arrow in Figures 2, 4, and 5 and is labelled 24. The adjustment frame 13 is also configured here such that the longitudinal direction 20 of the central web extends approximately along the transverse direction Y of the vehicle, except for the driving axis angle 11. Thus, the central web 16 runs essentially along the transverse direction Y of the vehicle. In the mounted state of the adjustment frame 13, as shown in Figures 2, 3, 4 to 5, the central web 16 extends above the vehicle 1 and connects the upper ends of the two side webs 15. Advantageously, the side webs 15 extend essentially vertically when the adjustment frame 13 is mounted, i.e., largely parallel to the vehicle's vertical direction Z. The laser device 14 is configured to emit the laser beam 22, which generates the laser line 21. The laser device 14 and the adjustment frame 13 are aligned such that, when the laser device 14 is switched on, the laser beam 22 strikes the ground 23 in front of the vehicle 1 from above, as shown in Figures 3, 4 to 5, so that the laser line 21 runs along the ground 23. In other words, the laser device 14 is mounted on the adjustment frame 13 or on the central support 16 above the vehicle 1 and emits the laser beam 22 forward and downward within an angular range that allows the laser line 21 to be generated on the ground 23 in front of the vehicle 1. Furthermore, according to Fig. 3, Fig. 4 to Fig. 5, the adjustment frame 13 and the laser device 14 are coordinated so that when the laser device 14 is switched on, the laser beam 22 from above also hits the front area 3 of the motor vehicle 1 in which the respective vehicle headlight 4 is located.As a result, the laser line 21 is also generated on this front area 3, so that the laser line 21 runs along the front area 3. The center web 16 can be equipped with a linear guide rail 25, which runs parallel to the center web longitudinal direction 20 and on which the laser device 14 is adjustably mounted. This allows the laser device 14 to be adjusted particularly easily and with high precision along the center web 16 in the longitudinal direction 20 on the guide rail 25. The following describes in more detail, with reference to Fig. 6, the method 26 for adjusting the headlights 4 of the motor vehicle 1 using the device 12. In a first step 27, the two side supports 15 are mounted on the two wheel hubs 17, which automatically aligns the center support 16 so that the longitudinal direction 20 of the center support runs parallel to the rear axle 9. In this first step 27, the adjustment frame 13 is therefore mounted on the motor vehicle 1. The mounted state is shown in Figs. 2, 3, 4 to 5. In a second step 28, the laser device 14 is switched on and adjusted along the center rib 16 in the longitudinal direction 20 until the laser line 21 passes through the center point 29 of the vehicle headlight 4 to be adjusted. In the examples in Fig. 4 and Fig. 5, the right vehicle headlight 4 is to be adjusted purely by way of example. Accordingly, the laser device 14 is adjusted here so that the laser line 21 passes through the center point 29 of the right vehicle headlight 4. In a third step 30, the vehicle headlight 4 to be adjusted is switched on and controlled to generate a reference image 31. The third step 30 can be performed before, during, or after the first step 27 and before, during, or after the second step 28. The reference image 31 is simplified in Figures 4 and 5 by a rectangle and has a reference mark 32, which is shown here purely as an example and without limitation of generality as a crosshair. Figure 4 shows the state before the adjustment of the right vehicle headlight 4. A distance 33 in the transverse direction Y of the vehicle between the reference mark 32 and the laser line 21 is visible. This distance 33 is due to the driving axis angle 11. In a fourth step 34, the vehicle headlight 4 to be adjusted is now set such that the reference mark 32 lies on the laser line 21. In other words, the distance 33 is eliminated. This state is shown in Fig. 5. The laser line 21 can now be seen passing exactly through the reference mark 32. If the motor vehicle 1, as in this case, has two headlights 4, these form a first headlight 4.1 and a second headlight 4.2, which simultaneously constitute a left headlight 4 and a right headlight 4. In the example shown here, the first headlight 4.1 forms the left headlight 4, while the second headlight 4.2 forms the right headlight 4. It is clear that other configurations are also possible. To adjust both headlights 4, the procedure 26 with steps 27, 28, 30, 34 is carried out twice, once for each of the two headlights 4. To adjust the first headlight 4.1, the laser device 14 is moved along the center rib 16 until the laser line 21 passes through the center 29 of the first headlight 4.1.The laser device 14 is switched on and activated to generate the reference image 31. The first vehicle headlight 4.1 is then adjusted until the reference mark 32 lies on the laser line 21. Following this, to adjust the second vehicle headlight 4.2, the laser device 14 is moved along the center rib 16 until the laser line 21 passes through the center 29 of the second vehicle headlight 4.2. The second vehicle headlight 4.2 is switched on and activated to generate the reference image 31. The second vehicle headlight 4.2 is then adjusted until the reference mark 32 lies on the laser line 21. In the figures shown here, the respective vehicle headlight 4 is controlled such that the reference image 31 is generated on the ground 23. In this case, the laser device 14 is consequently configured so that the laser line 21 also runs along the ground 23. In another embodiment, not shown here, the respective vehicle headlight 4 can also be controlled so that the reference image 31 is generated on a wall in front of which the vehicle 1 is standing, in particular on a building wall. Alternatively, the respective vehicle headlight 4 can also be controlled so that the reference image 31 is generated on a wall surface of a light-collecting box in front of which the vehicle 1 is standing. In these cases, the laser device 14 is then configured so that the laser line 21 also runs along the aforementioned wall or along the aforementioned wall surface.

Claims

Device (12) for adjusting vehicle headlights (4) of a motor vehicle (1),- with a U-shaped adjustment frame (13) having two side bars (15) and a central bar (16) connecting the two side bars (15) to each other,- with a laser device (14) for generating a laser line (21),- wherein the two side bars (15) form a left side bar (15.1) configured for mounting on a left wheel hub (17.1) of a left rear wheel (8.1) of the motor vehicle (1) and a right side bar (15.2) configured for mounting on a right wheel hub (17.2) of a right rear wheel (8.2) of the motor vehicle (1),- wherein the central web (16) has a central web longitudinal direction (20) and is arranged on the two side webs (15) such that the central web longitudinal direction (20) extends parallel to a rear axle (9) of the motor vehicle (1) defined by the two wheel hubs (17) when the side webs (15) are properly mounted on the two wheel hubs (17),- wherein the laser device (14) is attached to the central web (16) such that when the laser device (14) is switched on, the laser line (21) extends perpendicular to the central web longitudinal direction (20),- wherein the laser device (14) is adjustably attached to the central web (16) in the central web longitudinal direction (20) along the central web (16). Device (12) according to claim 1, characterized in that the adjustment frame (13) is configured such that the longitudinal direction of the center web (20) runs along a transverse direction (Y) of the vehicle when the side webs (15) are properly mounted on the two wheel hubs (17). Device (12) according to claim 1 or 2, characterized in that the laser device (14) is configured to emit a laser beam (22) which generates the laser line (21), and that the adjustment frame (13) and the laser device (14) are coordinated such that when the laser device (14) is switched on, the laser beam (22) hits a ground (23) on which the motor vehicle (1) is standing from above in front of the motor vehicle (1) and the laser line (21) runs along the ground (23). Device (12) according to claim 3, characterized in that the adjustment frame (13) and the laser device (14) are coordinated such that when the laser device (14) is switched on, the laser beam (22) hits a front area (3) of the motor vehicle (1) from above, which has the respective vehicle headlight (4), and the laser line (21) runs along the front area (3). Device (12) according to one of the preceding claims, characterized in that the central web (16) has a linear guide rail (25) extending parallel to the longitudinal direction (20) of the central web, on which the laser device (14) is adjustably mounted in the longitudinal direction (20) of the central web along the central web (16). Method (26) for adjusting vehicle headlights (4) of a motor vehicle (1) by means of a device (12) according to one of the preceding claims, - wherein the two side webs (15) are mounted on the two wheel hubs (17), - wherein the laser device (14) is switched on and adjusted in the longitudinal direction (20) along the central web (16) until the laser line (21) passes through a headlight center (29) of the vehicle headlight (4) to be adjusted, - wherein the vehicle headlight (4) to be adjusted is switched on and controlled to generate a reference image (31), - wherein the vehicle headlight (4) to be adjusted is adjusted so that a reference mark (32) of the reference image (31) lies on the laser line (21). Method (26) according to claim 6, characterized in that: - the motor vehicle (1) has two vehicle headlights (4), forming a first vehicle headlight (4.1) and a second vehicle headlight (4.2); - to adjust the first vehicle headlight (4.1), the laser device (14) is adjusted along the central rib (16) until the laser line (21) passes through the center (29) of the first vehicle headlight (4.1), the first vehicle headlight (4.1) is switched on and controlled to generate the reference image (31) and is adjusted so that the reference mark (32) of the reference image (31) lies on the laser line (21); - to adjust the second vehicle headlight (4.2), the laser device (14) is adjusted along the central rib (16) until the laser line (21) passes through the center (29) of the second vehicle headlight (4.2).2) is switched on and controlled to generate the reference image (31) and is set so that the reference mark (32) of the reference image (31) lies on the laser line (21). Method (26) according to claim 6 or 7, characterized in that the vehicle headlight (4) is controlled in such a way that the reference image (31) is generated on a ground (23) on which the motor vehicle (1) is standing in front of the motor vehicle (1), and that the laser device (14) is configured such that the laser line (21) runs at least along the ground (23). Method (26) according to claim 6 or 7, characterized in that the vehicle headlight (4) is controlled in such a way that the reference image (31) is generated on a wall in front of which the motor vehicle (1) is standing, and that the laser device (14) is configured in such a way that the laser line (21) runs at least along the wall. Method (26) according to claim 6 or 7, characterized in that the vehicle headlight (4) is controlled such that the reference image (31) is generated on a wall surface of a light collecting box located in front of the motor vehicle (1), and that the laser device (14) is configured such that the laser line (21) runs at least along the wall surface.

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