METHOD FOR STABILIZING A DRIVERLESS SINGLE-TRACK MOTOR VEHICLE ON A ROLLER TEST STAND, AS WELL AS STABILIZING DEVICE, ROLLER TEST STAND AND TEST SYSTEM

Description

[0001] The invention relates to a method for stabilizing a driverless single-track motor vehicle during a test run on a roller dynamometer according to the preamble of claim 1. Furthermore, the invention relates to a stabilization device for stabilizing a driverless single-track motor vehicle during a test run on a roller dynamometer according to the preamble of claim 9. Furthermore, the invention relates to a roller dynamometer with such a stabilization device and to a test system consisting of a roller dynamometer and a motor vehicle.

[0002] During development, production, or testing, motorcycles, like other single-track motor vehicles, are often tested on roller dynamometers. On many roller dynamometers, the front wheel of the vehicle is secured in a holding or clamping device, while only the rear wheel is placed on a rear-wheel roller unit. The rear wheel is driven by the vehicle's engine or by the rear-wheel roller unit. Securing the front wheel ensures that the vehicle is held longitudinally and remains upright.

[0003] However, in some tests of single-track vehicles, such as end-of-line tests, brake tests with ABS braking systems, or tests of single-track vehicles with driver safety programs, it may be necessary to drive both the rear and the front wheel at a specific speed. For this purpose, roller test benches for single-track vehicles exist with roller units for the front and rear wheels. The roller units can each have two parallel rollers (so-called double rollers), between which the front and rear wheels are stabilized in the longitudinal direction of the vehicle.However, single-track motor vehicles can tip to the side or move away from the center of the respective roller unit during a test run on such roller dynamometers, so that a driver is required to hold the motor vehicle upright and stabilize it by appropriate steering movements.

[0004] US Patent No. 10,417,930 B1 discloses a driving simulator in which the rear wheel suspension of a motorcycle is fixed by a fork that can be tilted around a horizontal axis. Both the front and rear wheels are driven by rollers. With the help of hydraulic cylinders and sensors, the motorcycle can be tilted around its longitudinal axis, thus simulating a ride. Ropes are attached to the front wheel to prevent the front wheel from slipping off the roller. However, steering movement is still possible, so the motorcycle would not be sufficiently stabilized without a driver.

[0005] US 5,076,792 A also shows a motorcycle on a simulator in which both the rear and front wheels are driven. A support element of the test stand is connected to the lower frame of the motorcycle. Since the front wheel is not fixed, stable, unmanned operation is not possible with the simulator in US 5,076,792 A.

[0006] DE 83 20 156 U1 discloses a roller test bench for a two-wheeled vehicle, which has two parallel, drivable rollers. In order to test the two-wheeled vehicle for different road surfaces, the rollers have individual zones of different properties arranged consecutively in the axial direction. By moving the vehicle along the axes of the rollers, the vehicle can be tested in the different zones. During the test, the two-wheeled vehicle is restrained in a retaining device that secures the vehicle against lateral displacement, longitudinal displacement, and rotation about the vertical axis. To simulate lateral inclination, a receiving part of the retaining device is rotatably mounted about a bolt. A joint element with a vertical axis of rotation is not disclosed in DE 83 20 156 U1.

[0007] Another test bench for vehicles is known from JP H 02136674 U.

[0008] In light of these statements, the object of the invention is to at least partially or completely mitigate the disadvantages of the prior art. Preferably, the object of the present invention is to provide a method and a stabilization device of the type mentioned above, which enable a stable driverless test run of a single-track motor vehicle on a roller dynamometer, in which both the front and rear wheels are driven.

[0009] This object is achieved by a method having the features of claim 1 and a stabilizing device having the features of claim 9. Preferred embodiments as well as a roller test bench and a test system are specified in the dependent claims.

[0010] According to the invention, the method according to claim 1 comprises the following steps: Connecting a front-wheel steering part of the motor vehicle to a stabilizing device having a stationary base part, a connecting element for connection to the front-wheel steering part, and a joint element connected to the base part and the connecting element, wherein the joint element has at least one substantially vertical axis of rotation; driving a front wheel of the motor vehicle by a front-wheel roller unit and / or driving a rear wheel of the motor vehicle by a rear-wheel roller unit; and stabilizing the motor vehicle by returning the front wheel to a desired front wheel position on the front-wheel roller unit by the stabilizing device in the event of a deviation of the front wheel from the desired front wheel position.

[0011] When the front wheel of the motor vehicle deviates from the target front wheel position, the stabilizing device tilts the front wheel steering element of the motor vehicle, thus forcing a steering movement that returns the front wheel to the target front wheel position on the front wheel roller unit. Due to the steering movement of the front wheel steering element and the return of the front wheel to the target front wheel position, the rear wheel is also guided back to its target rear wheel position in the event of a deviation, resulting in a self-positioning and self-stabilizing effect of the motor vehicle. Advantageously, the return of the front and rear wheels by the stabilizing device occurs passively, i.e., without active regulation or control and without active components such as servomotors or controlled hydraulic cylinders.A further advantage of the stabilization device is that the possibility of steering the front wheel steering part avoids transverse forces that could lead to warping of the motor vehicle and thus to increased rolling friction on the test bench. The front wheel roller unit and / or the rear wheel roller unit can each have one or more essentially parallel rollers. Accordingly, the front wheel roller unit and / or the rear wheel roller unit can also have one or more essentially parallel axes of rotation. The target front wheel position for the front wheel is preferably located essentially centrally on the front wheel roller unit, viewed in the direction of the one or more axes of rotation of the front wheel roller unit. In the target front wheel position, the front axle of the motor vehicle is oriented essentially parallel to the one or more axes of rotation of the front wheel roller unit.Accordingly, the rear wheel target position is preferably located substantially centrally on the rear wheel roller unit, viewed in the direction of the one or more axes of rotation of the rear wheel roller unit. In the rear wheel target position, the rear axle of the motor vehicle is oriented substantially parallel to the one or more axes of rotation of the rear wheel roller unit. The front wheel roller unit and the rear wheel roller unit can preferably be operated independently of one another. At least one drive motor, in particular an electric motor, can be assigned to each of the front wheel roller unit and / or the rear wheel roller unit. However, the rear wheel does not have to be driven by the rear wheel roller unit during a test run. The rear wheel can also be driven by an engine of the motor vehicle.In this disclosure, the front wheel steering part preferably comprises, by definition, all components of a single-track motor vehicle that can be pivoted relative to the main frame of the motor vehicle by a steering movement exerted via the steering.

[0012] In particular, this refers to the front wheel suspension, for example a front fork or a swing arm, the front wheel, the front axle, the steering tube, and the handlebar. The fixed base part of the stabilizing device is preferably connected to a stationary point, for example a floor surface or a wall. The connection can be made, for example, by a screw, rivet, or welded connection. The connecting element serves for the detachable connection to the front wheel steering part of the motor vehicle. The connection between the connecting element and the front wheel steering part can, for example, be a screw connection or a clamp connection. It can be provided, for example, that the connecting element is detachably connected, preferably by means of one or more screw nuts, to one or two opposite projecting axle ends of the front axle of the motor vehicle.The axle ends can, for example, be accommodated in corresponding pivot bearings of the connecting element. It is also possible for the connecting element to have a rotatably mounted wheel axle, which temporarily replaces the front axle of the motor vehicle during the test run. The joint element, thanks to the vertical axis of rotation, enables a steering movement of the front-wheel steering part in the event of a deviation of the front wheel from the desired front wheel position. Preferably, the joint element also has at least one horizontal axis of rotation. It is particularly preferred if the joint element has three orthogonally oriented axes of rotation. The three axes of rotation can each be formed by three different joints. However, it is preferred if the three axes of rotation are realized by a ball joint. In this way, a particularly smooth steering movement can be achieved regardless of the size and type of motorcycle.Directional information and orientations in this disclosure refer to the ready-to-drive, upright starting position of the motor vehicle on the roller dynamometer, with the front wheel in the desired front wheel position and the rear wheel in the desired rear wheel position. The front wheel is positioned "front" and the rear wheel is positioned "rear." A vertical axis of rotation of the joint element is oriented vertically in space, i.e., parallel to the acceleration due to gravity. The joint element can be connected to the base part, for example, by means of a rod.

[0013] It is preferred if, in the event of a deviation of the front wheel from the front wheel target position, the front wheel steering part is steered by the joint element in such a way that the front wheel is returned to the front wheel target position.

[0014] It is advantageous if the connecting element is connected to the motor vehicle via a front wheel suspension, particularly a front axle, of the front wheel steering component. This results in a particularly stable connection between the connecting element and the front wheel steering component, while also ensuring a direct transmission of the steering movement to the front wheel steering component.

[0015] To achieve a stable and secure connection between the front-wheel steering part and the stabilizing device, it is advantageous if the connecting element has two substantially parallel legs that are connected to opposite sides of the front-wheel steering part of the motor vehicle. The legs can be connected to one another via an end piece, for example a crossbar or a cross strut arranged particularly at right angles to the legs. In this embodiment, the connecting element is preferably designed as a fork. The end piece can in turn be connected to the joint element. At the ends of the legs opposite the end piece, the legs can have pivot bearings for protruding front axle ends or fastening elements with which the legs can be connected to the front-wheel steering part. The fastening elements can, for example, be rotatably mounted.The fastening elements can also be oriented at right angles to the legs. However, the connecting element can also be provided with a rotatably mounted wheel axle between the legs, which replaces the front axle of the vehicle during a test run. The wheel axle can be rotatably mounted on the legs.

[0016] It is advantageous if the joint element has at least one, preferably two, horizontal axes of rotation. This improves the steering movement.

[0017] A particularly advantageous embodiment of the invention results when the joint element is formed by a ball joint. Such a ball joint has three rotational degrees of freedom and thus also three axes of rotation, namely a vertical axis of rotation and two horizontal axes of rotation. An advantage of this embodiment is that the connecting element or the motor vehicle can also be tilted during the steering movement. Furthermore, vertical movements of the connecting element are enabled during the steering movement. Furthermore, the stabilizing device can be used with different types and sizes of single-track motor vehicles.

[0018] In order to additionally counteract any tipping over of the motor vehicle, it is advantageous if the motor vehicle is secured to at least one holding device using at least one holding element, preferably a holding strap. The at least one holding element can be fastened, for example, to the handlebar of the motor vehicle. The at least one holding device can be connected to a fixed point on the test bench. In the starting position of the motor vehicle, the at least one holding element can be connected to the motor vehicle without transferring a holding or clamping force to the motor vehicle, i.e. without stretching. In the event of a tipping movement, the at least one holding element, in addition to the stabilizing device, additionally prevents the motor vehicle from tipping over.Preferably, two holding elements are provided, in particular arranged on opposite sides of the motor vehicle, which are each fixed to a holding device and connected to the motor vehicle.

[0019] According to one embodiment of the invention, the motor vehicle is a motorcycle or a moped.

[0020] The above-mentioned object is also achieved by a stabilization device according to claim 9. The stabilization device is designed to stabilize a driverless single-track motor vehicle, in particular a motorcycle, during a test run on a roller test bench and has the following: a fixed base part; a connecting element for connection to a front-wheel steering part of the motor vehicle, in particular a front-wheel suspension; and a joint element connected to the base part and the connecting element, which has at least one substantially vertical axis of rotation.

[0021] With regard to the advantages and further embodiments of the stabilization device, reference is made to the above statements regarding the method according to claim 1. The advantages, definitions, and features described above are also transferable to the stabilization device according to claim 9.

[0022] It is advantageous if the joint element has at least one, preferably two, horizontal axes of rotation. This improves the steering movement.

[0023] The joint element of the stabilizing device is preferably formed by a ball joint. Such a ball joint has three rotational degrees of freedom and thus also three axes of rotation, namely a vertical axis of rotation and two horizontal axes of rotation. An advantage of this embodiment is that the connecting element or the motor vehicle can also be tilted during the steering movement. Furthermore, vertical movements of the connecting element are enabled during the steering movement. Furthermore, the stabilizing device can be used with different types and sizes of single-track motor vehicles.

[0024] A particularly stable connection between the front-wheel steering part and the connecting element can be achieved if the connecting element has two parallel legs that can be connected to opposite sides of the front-wheel steering part of the motor vehicle. The legs can be connected to one another via an end piece, for example a crossbar or cross strut arranged at right angles to the legs. In this embodiment, the connecting element is preferably designed as a fork. The end piece can in turn be connected to the joint element. At the ends of the legs opposite the end piece, the legs can have pivot bearings for protruding front axle ends or fastening elements with which the legs can be connected to the front-wheel steering part. The fastening elements can, for example, be rotatably mounted. The fastening elements can also be oriented at right angles to the legs.However, it can also be provided that the connecting element has a rotatably mounted wheel axle between the legs, which replaces the front axle of the vehicle during a test run. The wheel axle can be rotatably mounted on the legs.

[0025] The stabilization device of the type described can form part of a roller dynamometer. Such a roller dynamometer has a rear wheel roller unit and a front wheel roller unit. The substantially vertical axis of rotation of the joint element is then arranged substantially perpendicular to a floor surface of the roller dynamometer. The floor surface is preferably a horizontal floor surface.

[0026] In order to further prevent the motor vehicle from tipping over, it is advantageous if the roller test bench has at least one holding device and at least one holding element that can be connected to the holding device, preferably a holding strap, for securing the motor vehicle. The at least one holding element can be fastened, for example, to the handlebar of the motor vehicle. The at least one holding device can be connected to a fixed point on the test bench. In the starting position of the motor vehicle, the at least one holding element can be connected to the motor vehicle without applying a holding or clamping force, i.e. without stretching. In the event of a tipping movement, the at least one holding element, in addition to the stabilizing device, additionally prevents the motor vehicle from tipping over. Preferably, two holding elements, in particular opposite ones, are provided, each of which can be fixed to a holding device and connected to the motor vehicle.In this case, the vehicle can be additionally stabilized on two sides.

[0027] The invention further relates to a testing system comprising: a roller test bench of the type described; and a single-track motor vehicle, in particular a motorcycle, which is placed with a front wheel on the front wheel roller unit and with the rear wheel on the rear wheel roller unit, wherein a front wheel steering part of the motor vehicle is connected to the stabilization device of the roller test bench to stabilize the motor vehicle during a test run.

[0028] The invention is described in more detail below with reference to figures, to which, however, it is not intended to be limited. They show: Fig. 1A und Fig. 1B schematically shows a roller test bench from the state of the art with a single-track motor vehicle in an oblique view from the front; Fig. 2 schematically shows a roller test bench according to the invention with a single-track motor vehicle in an oblique view from the front; Fig. 3A-3C schematically shows the stabilization of a front wheel and a rear wheel of a single-track motor vehicle with the stabilization device according to the invention in a view from above; Fig. 4A-4C schematically shows the stabilization of a rear wheel with the stabilization device according to the invention in a view from above; and Fig. 5 schematic view of a roller test bench from the front.

[0029] Fig. 1 shows a prior art roller test bench 1a with a single-track motor vehicle 2 in the form of a motorcycle 3. The rear wheel 4 of the motor vehicle 2 can be driven by means of a rear-wheel roller unit 5 or an engine of the motor vehicle 2. The rear-wheel roller unit 5 of the illustrated roller test bench 1a has two parallel rollers 6 (so-called double rollers). The front wheel 7 is fixed by means of a clamping device 8 to prevent the motor vehicle 2 from tipping during a test run and to fix the motor vehicle 2 in the longitudinal direction. The front wheel 7 is not driven here, but is held immobile in the clamping device 8 during the test run.

[0030] However, in some tests, such as "end-of-line" tests in the production of single-track motor vehicles 2 or brake tests with ABS braking systems, it may be necessary for the front wheel 7 to be driven in addition to the rear wheel 4. Roller test benches 1b are known from the prior art for this purpose, in which both the front wheel 7 and the rear wheel 4 can be driven by means of corresponding roller units (see Fig. 1B ). However, a disadvantage is that a driver (not shown) must stabilize the single-track motor vehicle 2 on the roller units during a test run by steering movements in order to prevent the motor vehicle 2 from tipping over.

[0031] In order to enable a driverless test run of a single-track motor vehicle 2 on a roller test bench 1, a stabilizing device 9 is provided according to the invention, which can be connected to a front wheel steering part 10 of a single-track motor vehicle 2 (see Fig. 2 The stabilizing device 9 prevents the driverless single-track motor vehicle 2 from tipping and keeps it stable in the intended target position on the roller test bench 1.

[0032] Fig. 2 shows a roller test bench 1 with a rear wheel roller unit 5, a front wheel roller unit 11, and a stabilizing device 9. The front wheel 7 and the rear wheel 4 are placed on the front wheel roller unit 11 and the rear wheel roller unit 5, respectively. The stabilizing device 9 is connected to the front wheel steering part 10 of the motor vehicle 2. The rear wheel roller unit 5 and / or the front wheel roller unit 11 can be driven independently of one another. The rear wheel 4 can also be driven by the engine of the motor vehicle 2. The rear wheel roller unit 5 and the front wheel roller unit 11 can be designed as simple roller units, each with a single roller 6. However, the rear wheel roller unit 5 and the front wheel roller unit 11 can also each have two parallel rollers 6, as is the case with the roller test bench 1b according to Fig. 1B This allows the single-track motor vehicle 2 to be better secured in the longitudinal direction.

[0033] The stabilization device 9 according to the invention has a stationary base part 12, a joint element 13, and a connecting element 14. In the illustration shown, the base part 12 is cuboid-shaped and connected to a floor surface 40. The base part 12 can alternatively also be connected, for example, to a wall (not shown) or another fixed point in the surrounding area. The joint element 13 is preferably formed by a ball joint 15, which has three axes of rotation, namely a substantially vertical axis of rotation 16 and two substantially horizontal axes of rotation 17, 18. The joint element 13 has three rotational degrees of freedom that are independent of one another. The substantially vertical axis of rotation 16 can already cause a steering movement of the front-wheel steering part 10. The horizontal axes 17, 18 enable a steering movement adapted to the respective motor vehicle 2.The essentially horizontal axis 17 allows for a tilting motion, particularly a rolling motion, of the motor vehicle 2 during the steering movement. The essentially horizontal axis 18 allows for any vertical movements of the connecting element 14 during the steering movement to be compensated. Furthermore, motor vehicles of different sizes can be used, and conditions such as different tire pressures or tire conditions can be compensated for.

[0034] The connecting element 14 is designed to connect the stabilizing device 9 to a front-wheel steering part 10 of a single-track motor vehicle 2 and, in the illustration shown, has two essentially parallel legs 19, which are connected to one another via a cross strut 20 oriented essentially at right angles to the two legs 19. The cross strut 20 is in turn connected to the joint element 13 via an extension 21. At the ends opposite the cross bar 20, the legs 19 in the illustration shown each have fastening elements 22, which can also be arranged essentially at right angles to the legs 19. The fastening elements 22 can be connected, for example, to a front-wheel suspension 23 of the single-track motor vehicle 2, in particular a front fork 24, or a front axle. The connection can be made, for example, by means of screw nuts.The fastening elements 22 can be rotatably mounted on the legs 19. However, it is also possible to connect the stabilizing device 9 to other parts of the front wheel steering part 10, for example, the handlebar 25.

[0035] When the front wheel 7 of the single-track motor vehicle 2 deviates from a front wheel target position P V_Soll, the stabilization device 9 tilts the front wheel steering part 10, thus forcing a steering movement that returns the front wheel 7 to the front wheel target position P V_Soll. The steering movement of the front wheel steering part 10 also guides the rear wheel 4 back to its rear wheel target position P H_Sol in the event of a deviation, resulting in a self-positioning and self-stabilizing effect of the single-track motor vehicle 2. Advantageously, the return of the front wheel 7 and the rear wheel 4 by the stabilization device 9 takes place without active regulation or control.

[0036] In Fig. 3A-C The return of the front wheel 7 to the front wheel target position P V_Soll and the return of the rear wheel 4 to the rear wheel target position P H_Soll are schematically illustrated in a top view. The front wheel target position P V_Soll is preferably located in the center of the front wheel roller unit 11, and the rear wheel target position P H_Soll is preferably located in the center of the rear wheel roller unit 5.

[0037] In Fig. 3A the single-track motor vehicle 2 is deflected to the left, so that the front wheel 7 and the rear wheel 4 are not at the respective target positions P V_Soll and P H_Soll. As in Fig. 3A As shown, the stabilizing device 9 forces a steering movement of the motor vehicle 2 to the right due to the deviation of the front wheel 7 from the front wheel target position P V_Soll, so that the front wheel 7 and subsequently also the rear wheel 4 are returned to the respective target positions P V_Soll and P H_Soll.

[0038] In Fig. 3B the front wheel 7 and the rear wheel 4 are in the respective target positions P V_Soll and P H_Soll in the middle of the roller units 5, 11. This position of the motor vehicle 2 can also be referred to as the normal position or starting position.

[0039] In Fig. 3C is the one to Fig. 3A mirror-image case shown. Fig. 3C shows a deflection of the single-track motor vehicle 2 to the right and a steering movement to the left forced by the stabilizing device 9, so that the front wheel 7 and also the rear wheel 4 are returned to the respective target position P V_Soll and P H_Soll.

[0040] In the Fig. 4A-C A return of the rear wheel 4 to the rear wheel target position P H_Soll is schematically illustrated in a top view. The front wheel 7 is already in the front wheel target position P V_Soll.

[0041] In Fig. 4A the rear wheel 4 is deflected to the left and is therefore not in the rear wheel target position P H_Soll . Due to the alignment of the front wheel 7, which is already in the front wheel target position P V_Soll, the rear wheel 4 is also brought back to the rear wheel target position P H_Soll by the occurring restoring forces F, as shown in Fig. 4B is shown.

[0042] Fig. 4B shows the single-track motor vehicle 2 in the normal or starting position.

[0043] In Fig. 4C is the one to Fig. 4A mirror-image case. In Fig. 4C the rear wheel 4 is deflected to the right and is not in the rear wheel target position P H_Soll . By aligning the front wheel 7 in the front wheel target position P V_Soll , the rear wheel 4 is also brought back to the rear wheel target position P H_Soll by the restoring forces F that occur (see Fig. 4B ).

[0044] Fig. 5 shows a schematic front view of a test system 26 with a roller test bench 1 and a single-track motor vehicle 2 arranged thereon. The single-track motor vehicle 2 is connected to the stabilizing device 9, which, however, is not shown for the sake of clarity. The motor vehicle 2 is additionally secured on opposite sides by holding elements 27 in the form of holding belts 28. The holding elements 27 can also be formed by ropes or chains. The holding elements 27 are each fastened to a fixed holding device 29, for example a hook or a fastening eyelet, and to the single-track motor vehicle 2. In the illustration shown, the holding elements 27 are fastened to the ends of the handlebar 25. However, the holding elements 27 can also be fastened to another location on the motor vehicle 2. Fig. 5The single-track motor vehicle 2 is in the upright, ready-to-drive normal position. In this position, the retaining elements 27 do not exert any clamping force on the single-track motor vehicle 2. However, as soon as the single-track motor vehicle 2 tilts in one direction, one of the retaining elements 27 is clamped, preventing the single-track motor vehicle 2 from tipping further.

Claims

1. A method for stabilising a driverless single-track motor vehicle (2), in particular a motorcycle (3), during a test run on a roller dynamometer (1), the method comprising the steps of: connecting a front wheel steering part (10) of the motor vehicle (2) to a stabilising device (9) which has a stationary base part (12) and a connecting element (14) for connection to the front wheel steering part (10); driving a front wheel (7) of the motor vehicle (2) by a front wheel roller unit (11) and / or driving a rear wheel (4) of the motor vehicle (2) by a rear wheel roller unit (5); and stabilising the motor vehicle (2) by returning the front wheel (7) to a front wheel setpoint position (PV_Soll) on the front wheel roller unit (11) via the stabilising device (9) in the event of a deviation of the front wheel (7) from the front wheel setpoint position (PV_Soll), characterized in that the stabilizing device (9) has a joint element (13) connected to the base part (12) and the connecting element (14), and the joint element (13) has at least one substantially vertical rotation axis (16).

2. The method according to claim 1, characterised in that in the event of a deviation of the front wheel (7) from the front wheel setpoint position (PV_Soll), the front wheel steering part (10) is steered by the joint element (13) in such a way that the front wheel (7) is returned to the front wheel setpoint position (PV_Soll).

3. The method according to claim 1 or 2, characterised in that the connecting element (14) is connected to the motor vehicle (2) at a front wheel suspension (23), in particular at a front axle, of the front wheel steering part (10).

4. The method according to any of claims 1 to 3, characterised in that the connecting element (14) has two substantially parallel legs (19) connected to opposite sides of the front wheel steering part (10) of the motor vehicle (2).

5. The method according to any of claims 1 to 4, characterised in that the joint element (13) has at least one, preferably two, horizontal rotation axes (17, 18).

6. The method according to any of claims 1 to 5, characterised in that the joint element (13) is formed by a ball-and-socket joint (15).

7. The method according to any of claims 1 to 6, characterised in that the motor vehicle (2) is additionally fixed to at least one holding device (29) by at least one holding element (27), preferably a holding belt (28).

8. The method according to any one of claims 1 to 7, characterised in that the motor vehicle (2) is a motorcycle (3) or a moped.

9. A stabilising device (9) for stabilising a driverless single-track motor vehicle (2), in particular a motorcycle (3), during a test run on a roller dynamometer (1), comprising: a stationary base part (12); and a connecting element (14) for connection to a front wheel steering part (10) of the motor vehicle (2), in particular a front wheel suspension (23); characterized in that the stabilizing device (9) has a joint element (13), which is connected to the base part (12) and the connecting element (14) and which has at least one substantially vertical rotation axis (16).

10. The stabilising device according to claim 9, characterised in that the joint element (13) has at least one, preferably two, horizontal rotation axes (17, 18).

11. The stabilising device (9) according to claim 9 or 10, characterised in that the joint element (13) is formed by a ball-and-socket joint (15).

12. The stabilising device (9) according to any of claims 9 to 11, characterised in that the connecting element (14) has two parallel legs (19), which can be connected to opposite sides of the front wheel steering part (10) of the motor vehicle (2).

13. A roller dynamometer (1) comprising a rear wheel roller unit (5) and a front wheel roller unit (11), characterised in that the roller dynamometer (1) has a stabilising device (9) according to any one of claims 9 to 12, wherein the vertical rotation axis (16) is arranged substantially perpendicular to a bottom surface (40) of the roller dynamometer (1).

14. The roller dynamometer (1) according to claim 13, characterised in that the roller dynamometer (1) has at least one holding device (29) and at least one holding element (27) for fixing the motor vehicle (2), preferably a holding belt (28), which can be connected to the holding device (29).

15. A test system (26) comprising: a roller dynamometer (1) according to any one of claims 13 or 14; and a single-track motor vehicle (2), in particular a motorcycle (3), which is placed with a front wheel (7) on the front wheel roller unit (11) and with the rear wheel (4) on the rear wheel roller unit (5), wherein for stabilising the motor vehicle (2) during a test run, a front wheel steering part (10) of the motor vehicle (2) is connected to the stabilising device (9) of the roller dynamometer (1).