DE19857871C1 - Automobile distance regulation radar sensor adjustment device uses angle sources for alignment of frame supporting laser source with automobile longitudinal axis and evaluation of reflected laser beam for sensor adjustment - Google Patents

Abstract

The adjustment device uses a laser source (24) mounted on a frame (22) positioned in front of the automobile, for directing a laser beam onto a mirror (13) provided by the radar sensor (12) perpendicular to the propagation direction of the radar beam. The rear wheels of the automobile have angle sources (14,16) used for alignment of the frame with the automobile longitudinal axis in conjunction with angle sources (18,20) at the opposite sides of the latter, with correction of the radar sensor using evaluation of the reflected laser beam.

Description

The invention relates to a device for adjusting a distance Radar sensor, which is part of an automatic distance control a motor vehicle, as is known from DE 197 07 590 A1, on which the preamble of claim 1 is known.

Recently, the cruise control in motor vehicles has been in developed in such a way that an automatic distance control is provided, which ensures that a motor vehicle with automatic Cruise control does not hit a vehicle in front when the vehicle in front is slightly slower than the one behind Vehicle. As part of the automatic distance control, the distance measured between the two vehicles by a radar sensor, and the Speed of the following vehicle is reduced when the Distance between the two vehicles below a predetermined value falls off. The automatic distance control therefore supports the driver of the following vehicle during routine activities in uncritical  Driving situations. The optimal area of application of the automatic distance control is at for example when driving on motorways and highway-like roads.

The automatic distance control includes a distance radar sensor in the middle with the help of a bracket on an angle, for example on the bumper cross member in the door zenreich is attached. The distance radar sensor must with respect to the geometric Travel axis or the direction of travel of the motor vehicle are aligned, an adjustment is required to take into account the driving axis angle error. For the adjustment a Ju stage unit provided, with which the distance radar sensor in the horizontal (azimuth) and is adjustable in the vertical (elevation). The adjustment must therefore be made after mounting the Distance radar sensor on the vehicle.

DE 42 01 214 C1 describes a device for adjusting a directional antenna Radar distance warning device known. There is an alignment light on the directional antenna rigidly attached. The adjustment of the rigid unit consisting of directional antenna and adjustment spotlight is done by aligning the optical axis of the light cone of the adjustment headlight with Using a vehicle-related optical detection device. The accuracy of the adjustment of the Radar distance warning device therefore depends on the accuracy of the adjustment of the light cone of the adjustment lamp.

DE 196 42 811 A1 describes a method for adjusting the main beam direction the directional antenna of a radar system, which is used in particular in a motor vehicle finds known with the help of a laser beam. A laser source is attached to the directional antenna or arranged on another device so that its laser beam in a known Angle and at a known distance to a beam axis of the directional antenna. The The directional antenna is then adjusted so that the laser beam has a predetermined target lighting illuminated.

DE 197 07 590 A1 describes a method and a device for adjusting the Alignment of a beam characteristic of a distance sensor is known. In doing so, a pre direction for positioning a motor vehicle, preferably a headlight adjustment device, provided with a target object for the distance sensor. The distance sensor can it is, among other things, a range radar, with preference then being the target as a radar reflector is used. When adjusting, one must first  device placed in the vehicle, for example the headlight setting device, into a defined position to be brought to the vehicle. Among other things, this can be achieved be that the target attached to the device placed in front of the vehicle is a Has laser beam source, the beam of which is aimed at the center of the radar antenna. Then using the radar antenna and the target object reflected radar waves, from a display device connected to the radar antenna displayed sizes and the known distance and angular position of the target object a Ju Orientation of the radar antenna in the horizontal and vertical so that the Radar antenna displayed distances and angular positions of the target with the known th distances and angular positions of the target object are brought into agreement.

The invention has for its object a device for adjusting an Ab to provide radar sensors on a motor vehicle, in which the adjustment to opti paths, for example by a laser beam with the least possible effort and can be carried out as simply and without risk during operation.

The device according to the invention uses a laser to achieve this object radiation source, which is arranged on a frame in front of the motor vehicle in such a positive is to bring that the laser beam of the laser beam source on one at the distance Radar sensor ge perpendicular to the direction of propagation of the radar beam arranged mirror is directed, two rear, arranged on the rear wheels of the motor vehicle Winkelge super units whose angle encoders relate to a zero alignment parallel to the wheel plane of the have the rear wheel and in the direction of travel of the motor vehicle, two front Winkelge Super units, which are arranged in front of the motor vehicle on the frame and their angle encoder zero alignment parallel to each other and against the direction of travel of the force have vehicle, an evaluation device, which is known per se  From the output signals of the angle sensors, the individual angles at the front and calculated to the right to the geometric travel axis, the laser beam being the Laser beam source by aligning the frame along the bisector the total track angle of the rear wheels is adjustable, an adjustment device on the distance radar sensor by one to the distance radar sensor adjust horizontal and vertical axis until that of the mirror reflected laser beam with that emitted by the laser beam source Laser beam coincides.

By means of this adjustment device, the distance radar sensor becomes the automatic distance control taking into account the driving axle angle or adjusted to the geometric travel axis. In particular, when adjusting the Measured value of the measurement or analogous to an axis measurement takes into account the correction value of the driving axis angle error, and the The position of the distance radar sensor is corrected accordingly. The Adjustment of the distance radar sensor can be done as a quick adjustment without previous complete wheel alignment and alignment were carried out, the setup time of the Quick adjustment can be less than 15 minutes. After all, it's an easy one Handling possible without additional special tools.

An advantageous embodiment of the device according to the invention is characterized in that two further angle encoder units on the two Angle encoder units are attached to the frame via support arms, one Zero alignment perpendicular to the zero alignment of the angle encoders of the two Have angle encoder units on the frame.

In this embodiment of the device according to the invention can Principle of an axle measuring system with six angle encoder units and associated ones Electronics are used so that in addition to the frame and the Laser beam source no further expenditure on equipment is required to carry out the adjustment.

An axle measuring system with six angle encoder units is out, for example known from DE 29 34 411 C3, the two angle encoder units on the Rear wheels, two angle encoder units on the front wheels and two more  Has angle encoder units, the support arms on the angle encoder at the Front wheels are mounted. From the measurements, the device can Single track of the front wheels with respect to the geometric driving axis, the Total track of the rear wheels and thus also the driving axle angle determined become. When using such a wheel aligner as part of the The device according to the invention can therefore be aligned without the frame additional effort with the angle encoder units.

Another advantageous embodiment of the invention Device is characterized in that on the two angle encoder units two further angle sensors are arranged on the rear wheels via support arms, which have a zero alignment parallel to each other and perpendicular to the zero Alignment of the angle encoders of the two angle encoder units with the Have rear wheels.

In this embodiment of the device according to the invention used an axle measuring system with eight angle encoder units, as is currently the case is largely used in wheel alignment. A possible execution of such an axis measuring system with eight angle encoder units is in the US-A- 4,383,370. Even when using such a wheel alignment system the eight angle encoder units and the associated electronics the device according to the invention without additional construction costs in the Determination of the driving axis angle can be built up. Although in the US-A- 4,383,370 a certain calculation method for the different track angles and can also be used for the calculation of the driving axle angle other mathematical calculation methods are used.

Another advantageous embodiment of the invention Device is characterized in that the laser beam Laser beam source perpendicular to the connecting line of the angle encoder on the Frame is arranged. So that the laser beam is automatically along the Geometric travel axis when aligned by the device "Single angle" is displayed at the front left and right equal to zero.  

Another advantageous embodiment of the invention Device is characterized in that the laser beam Laser beam source down the same angle from the horizontal is directed around by the radar beam from the distance radar sensor is directed. Practical tests have shown that a The distance radar sensor is tilted one degree from the horizontal upwards gives an optimal field of vision by the distance to the preceding vehicle can be measured. If the laser beam Laser beam source down the same angle from the horizontal is directed, the orientation of the distance radar sensor can be independent of how far, within certain limits, the frame with the Laser light source is located away from the distance radar sensor. With In other words, the distance between the Laser beam source and the distance radar sensor are not critical.

Another advantageous embodiment of the invention Device is characterized in that the laser beam source in one Housing is arranged around a horizontal and to the connecting line of the Angle encoder on the frame parallel axis pivotable on the frame is arranged. This configuration of the device according to the invention the laser beam source can easily and precisely to the desired inclination can be adjusted relative to the horizontal. The setting will then made at the factory and permanently locked. The housing is preferably arranged on an elbow, which is attached to a carriage that on a guide rail along the connecting line between the angle encoders is movable. With this device, the adjustment can also be done without Further be done on a vehicle if the vehicle happens to be is off-center with respect to the frame.

Another advantageous embodiment of the invention Device is characterized in that at the laser beam source Target is arranged through the center of the laser beam from the Laser beam source emerges. The distance radar sensor is then on the  Motor vehicle aligned when the laser beam is in the center of the target is reflected back. This creates a simple device with which can be determined when the distance radar sensor is in the desired direction is aligned.

Another advantageous embodiment of the invention Device is characterized in that the frame with a crossbar has end receptacles for the angle encoder units.

Finally, a further advantageous embodiment of the Device according to the invention characterized in that the Angle encoder units are designed in the same way as in so-called wheel aligners is known.

Further advantageous embodiments of the invention result from the remaining subclaims.

Embodiments of the invention will now be described with reference to the enclosed L Described drawings. Show it:

Figure 1 is a plan view of a schematic representation of a motor vehicle in a device according to the invention.

Fig. 2 is a side view like Fig. 1;

Fig. 3 is a top view of the distance radar sensor;

Figure 4 is a perspective view of the motor vehicle to be arranged in front of the frame with two angle encoder units.

Fig. 5 is a detailed view of Fig. 4; and

Fig. 6 is a plan view of part of the frame of Fig. 4 above.

Figs. 1 and 2 show schematically a motor vehicle as well as the device for adjusting the distance radar sensor on the motor vehicle. The motor vehicle comprises a body 2 , two rear wheels 4 , 6 , two front wheels 8 , 10 and a distance radar sensor 12, also shown schematically, with a mirror 13 provided for adjustment. The adjusting device comprises two angle transmitter units 14 , 16 , which are arranged on the rear wheels 4 and 6 , two angle transmitter units 18 , 20 , which are arranged on a frame 22 , on which a laser beam source 24 is also arranged.

The two rear angle transmitter units 14 , 16 arranged on the rear wheels 4 , 6 of the motor vehicle 2 have two angle transmitters 26 , 28 , the zero alignment of which is aligned parallel to the wheel plane of the relevant rear wheels 4 , 6 and in the direction of travel of the motor vehicle, ie from the rear to the front is. In the case of an angle encoder, zero orientation means the direction in which it indicates no deflection or no deviation from an angle equal to zero or its output signal is zero. On the two angle transmitter units 14 , 16 at the rear wheels, two further angle transmitter units 30 , 32 are arranged via support arms 34 , 36 in such a way that the angle transmitters have a zero alignment parallel to one another and perpendicular to the zero alignment of the angle transmitters of the two transmitter units 26 , 28 on the rear wheels.

The front angle transmitter units 18 , 20 are arranged in front of the motor vehicle on the frame 22 such that their angle transmitters 38 , 40 have a zero alignment parallel to one another and counter to the direction of travel of the motor vehicle. The connecting line of the angle sensors 38 , 40 is perpendicular to the zero orientation of the angle sensors 38 , 40 . The two angle transmitter units 18 , 20 also have two further angle transmitters 42 , 44 , which are arranged on the angle transmitters 38 , 40 via support arms 46 , 48 , and which have a zero alignment perpendicular to the zero alignment of the angle transmitters 38 , 40 of the angle transmitter units 18 , 20 have on the frame 22 . In this arrangement, the outputs of the angle sensors 42 , 44 are always zero.

The angle encoder units 14 , 16 , 18 , 20 together with an evaluation device (not shown) form the essential components of a known wheel alignment system with eight angle encoders, as mentioned at the beginning. In a manner known per se, the evaluation device calculates the total track of the rear wheels, the angle between the axis of symmetry of the motor vehicle and the bisector of the total track angle of the rear wheels and the individual angles of the front angle transmitters to the geometric travel axis from the output signals of the angle transmitters of the angle transmitter units. If such a wheel alignment system is used for wheel alignment, the individual angle of the front angle encoder devices to the geometric travel axis is the so-called single track of the left or right front wheel. In the present case, however, the angle transmitter devices 18 , 20 are not mounted on the front wheels 8 , 10 , but on the frame 22 , in order in this way to provide an adjustment device for the distance radar sensor. Instead of the wheel plane, with respect to which the angle encoders are mounted and oriented during the wheel alignment, in the present device there is the "reference plane", with respect to which the angle encoders are mounted and oriented in the adjustment device. The reference plane is perpendicular to the connecting line between the angle encoders 38 , 40 mounted on the frame, and the zero encoders 38 , 40 are oriented perpendicular to the named connecting line with their zero orientation.

Taking the definitions into account for the angle calculation in such a system, the result is that

• a) the direction of rotation is counterclockwise that
• b) the angle measuring device rotates clockwise that
• c) the reference point of the connecting line between two angle sensors stationary remains that
• d) The top view of the system shown in Fig. 1 is a top view and the output signal of the angle encoder 44 with "A", the output signal of the angle encoder 42 with "B", the output signal of the angle encoder 40 with "C", the output signal of the angle encoder 38 with "D", the output signal of the angle encoder 28 with "E", the output signal of the angle encoder 26 with "F", the output signal of the angle encoder 32 with "G", and the output signal of the angle encoder 30 with "H" , and that
• e) finally the sign determination of the angle encoder for the track calculation is made as follows:
  A = + B = -C = -D = +
  E = + F = -G = -H = +,
  following formulas:
  Total track at the rear
  (a) GSpH = G - H
  (b) GSpH = A - B - C + D + E - F
  "Single angle" front left (EWVl) to the geometric driving axis, this value being referred to as "single track front left" (ESpVl) when measuring the axles,
  

The "single angle" at the front right (EWVr) to the geometric travel axis, this value being referred to as "single track at the front right" (ESpVr) when measuring the axles

Offset of the two angle encoders 18 , 20 on the frame (VvG), this value being the front wheel offset (RvVG) to the geometric axis when measuring the axis

Geometric travel axis

The sign determination is marked in FIG. 1 with "plus sign" and "minus sign".

In the above equations, variant (a) applies to wheel alignment systems with six angle encoders or eight angle encoders, while variants (b) only apply to wheel alignment systems with eight angle encoders.

It can thus be seen from the equations that, for the purposes of the present adjustment device, both the components of an axle measuring system with eight angle sensors and the components of an axle measuring system with six angle sensors can be used. Since the angle transmitters 38 , 40 are mounted in a fixedly defined position on the frame 22 , and since the angle transmitters 42 , 44 are firmly attached to the angle transmitters 38 , 40 by means of support arms, the angle transmitters 42 , 44 are each in their zero orientation, so that their measurements do not contribute to the above equations. Consequently, the angle transmitters 42 , 44 could also be omitted, leaving a device for the adjustment device which only comprises the angle transmitters 26 , 28 and 38 , 40 and the frame with the laser beam source and the mirror 13 on the distance radar sensor.

The use of a wheel alignment system with six angle encoders or with However, eight angle encoders have certain advantages because of existing components can be used without operational changes. Finally, be on it noted that not only so-called optical wheel aligners, in which the Alignment of the angle encoders is carried out by infrared rays,  but also electromechanical wheel aligners can be used at the angle encoders on top of each other with stretchable cords (rubber cord) are aligned, as also for example from DE 29 34 411 C3 are known.

Fig. 3 shows a top view of the distance radar sensor 12 with the mirror 23. The mirror 13 is oriented perpendicular to the direction of propagation R of the radar beam if it is mounted on the distance radar sensor at corresponding reference points. The distance radar sensor 12 has two adjustment screws 15 , 17 which are used to adjust the distance radar sensor 12 in the vertical (elevation) or horizontal (azimuth).

FIG. 4 shows a perspective illustration of the frame 22 on which the laser beam source 24 is arranged and which carries the angle encoder units 18 , 20 . The frame 22 is to be positioned in front of the motor vehicle in such a way that the laser beam from the laser beam source 24 is directed onto the mirror 13 arranged on the distance radar sensor 12 perpendicular to the direction of propagation of the radar beam. This completes a first, rough alignment of the frame with the laser light source 24 . The laser beam from the laser beam source 24 is then adjusted by aligning the frame 22 along the bisector of the total track angle of the rear wheels, this adjustment being realized when the two individual front angles to the geometric travel axis are equal to zero. If the angle between the reference plane of the frame (corresponds to the wheel plane for wheel alignment) and the plane of symmetry of the motor vehicle is equal to the driving axis angle, the frame is aligned with the geometric driving axis. This completes the second step of the adjustment.

When using the device according to the invention, the angle encoder units 18 , 20 are first attached to the front of the frame in the manner described. Then the angle encoder units 14 , 16 are attached to the rear of the wheels 4 , 6 . The wheel alignment system is switched to the display "single track in front". The frame 22 is rotated until "zero" is displayed for the display "single track front left" and the display "single track front right". Since, by definition, the single track is the angle between the wheel center plane and the geometric driving axis, and the frame 22 has a "track" equal to zero, the frame 22 is now at an angle of 90 degrees to the geometric driving axis. A lateral offset of the frame is not relevant since the distance radar sensor 12 is adjusted over the surface of the mirror 13 .

Next, an adjustment device on the distance radar sensor 12 is actuated to adjust the distance radar sensor 12 about a horizontal and a vertical axis until the laser beam reflected by the mirror 13 coincides with the laser beam emitted by the laser beam source 24 . The adjustment is then completed, because the distance radar sensor is now exactly perpendicular to the laser beam, which in turn runs exactly parallel to the geometric travel axis.

Before carrying out the adjustment, the frame 22 must also be set up in such a way that the angle transmitters 38 , 40 lie exactly at the same height (horizontal alignment) and that the zero directions of the angle transmitters also lie in a horizontal plane.

As can be seen from Fig. 4 also, the frame 22 comprises a base plate 50 and a thereon mounted at three points plate 52, attached to the plate 52 column 54, a cross bar 56 and a quick clamping device 58 by means of which the crossbar 56 to be attached to the column 58 in a height-adjustable manner. At the three bearing points, bearing devices 60 , 62 , 64 are arranged, each of which comprises a bolt that extends through the plate 52 into the base plate 50 and disc springs between the plate 52 and the base plate 50 . By adjusting the bolts, the cross bar 56 can thus be aligned with the horizontal, as will be described in more detail.

In FIGS. 5 and 6, a housing 70 of the laser beam source 24 is shown, which is arranged around a horizontal connecting line of the angle encoder 38 40 on the frame 22 pivotally mounted to the frame 22. For this purpose, the housing 70 is pivotably and lockably arranged on an angle piece 72 , which is fastened to a slide 74, which is displaceable on the frame on a guide rail 76 along the connecting line between the two angle sensors 38 , 40 . A target 78 is also arranged on the front of the housing 70 , as can be seen from FIGS. 5 and 6. The laser beam emerges from the housing perpendicular to the connecting line of the angle sensors from the frame 22 . Because of the pivotability and lockability between the housing 70 and the angle 72 , the housing 70 can be adjusted so that the laser beam is directed downwards from the horizontal by the same angle that the radar beam is directed upwards by the distance radar sensor 12 is. After this setting, the housing 70 is locked at the angle 72 . The carriage 74 and the rail 76 serve to enable a lateral adjustment of the housing 70 when the motor vehicle is not exactly centered on the test station.

Two vials 80 , 82 are provided on the angle 72 , which serve to determine the horizontal orientation of the transverse rod 56 along the two mutually perpendicular horizontal axes or to adjust the frame or the transverse rod about the two horizontal axes. For horizontal alignment, the two angle sensors for camber and spread measurement can also be used, which are known components of the wheel alignment systems.

The height adjustment of the laser beam source 24 on the column by the quick release device serves mainly to adjust the laser beam to the height of the mirror 13 on the distance radar sensor. It is only important that the laser beam be reflected by the mirror, while an exact center impact of the laser beam on the mirror is not necessary because of the geometry of the device.

Claims (18)

1. Device for adjusting a distance radar sensor, which is part of an automatic distance control, on a motor vehicle with a laser beam source ( 24 ) which is arranged on a frame ( 22 ) which is to be positioned in front of the motor vehicle in this way, that the laser beam from the laser beam source ( 24 ) is directed at an object arranged on the distance radar sensor ( 12 ) perpendicular to the direction of propagation of the radar beam, the laser beam from the laser beam source ( 24 ) can be adjusted by aligning the frame ( 22 ), and with an adjusting device the distance radar sensor ( 12 ) to adjust the distance radar sensor about a horizontal and vertical axis, characterized by
two rear angle transmitter units ( 14 , 16 ) arranged on the rear wheels of the motor vehicle, the angle transmitters ( 26 , 28 ) of which have a zero alignment parallel to the wheel plane of the relevant rear wheel ( 4 , 6 ) and in the direction of travel of the motor vehicle, two front angle transmitter units ( 18 , 20 ), which are arranged in front of the motor vehicle on the frame ( 22 ) and whose angle sensors ( 38 , 40 ) have a zero orientation parallel to one another and counter to the direction of travel of the motor vehicle,
an evaluation device which, in a manner known per se, calculates the individual angles at the front left and right to the geometric travel axis from the output signals of the angle transmitters of the angle transmitter units ( 14 , 16 , 18 , 20 ),
wherein the laser beam of the laser beam source ( 24 ) can be adjusted by aligning the frame ( 22 ) along the bisector of the total track angle of the rear wheels ( 4 , 6 ), and wherein the distance radar sensor ( 12 ) is adjustable by the adjusting device until that from perpendicular to Direction of propagation of the radar beam, object arranged on the distance radar sensor ( 12 ), which is a mirror ( 13 ), reflected laser beam coincides with the laser beam emitted by the laser beam source ( 24 ). 2. Apparatus according to claim 1, characterized in that two further angle sensors ( 42 , 44 ) are attached to the two angle sensors ( 38 , 40 ) on the frame ( 22 ) via support arms ( 46 , 48 ) which have a zero orientation perpendicular for zero alignment of the angle sensors of the two angle sensors ( 38 , 40 ) on the frame ( 22 ). 3. Apparatus according to claim 1 or 2, characterized in that on the two angle sensors ( 26 , 28 ) at the rear wheels ( 4 , 6 ) two further angle sensors ( 30 , 32 ) via support arms ( 34 , 36 ) are arranged, one Have zero alignment parallel to one another and perpendicular to the zero alignment of the angle sensors ( 26 , 28 ) on the rear wheels. 4. The device according to claim 1, characterized in that the laser beam of the laser beam source ( 24 ) is arranged perpendicular to the connecting line of the angle encoder ( 26 , 28 ) on the frame ( 22 ). 5. Apparatus according to claim 1 or 4, characterized in that the laser beam of the laser beam source ( 24 ) is directed downwards by the same angle from the horizontal by which the radar beam from the distance radar sensor ( 12 ) is directed upwards. 6. The device according to claim 1, characterized in that the laser beam source ( 24 ) is arranged in a housing ( 70 ) which is pivotable about a horizontal and parallel to the connecting line of the angle encoder ( 38 , 40 ) on the frame ( 22 ) on the axis Frame is arranged. 7. The device according to claim 6, characterized in that the housing ( 70 ) is arranged on an angle piece ( 72 ) which is fastened to a carriage ( 74 ) which on a guide rail ( 76 ) along the connecting line between the two angle sensors ( 38 , 40 ) is displaceable. 8. Device according to one of the preceding claims, characterized in that a target (78) is arranged on the laser beam source (24), emerges through the center of the laser beam from the laser beam source (24). 9. Device according to one of the preceding claims, characterized in that the frame ( 22 ) has a cross bar ( 56 ) with end receptacles for the angle encoder units. 10. The device according to claim 9, characterized in that the receptacles are formed by bores in the ends of the crossbar ( 56 ). 11. The device according to claim 1, characterized in that the laser beam source ( 24 ) on the frame ( 22 ) is arranged adjustable in height. 12. Device according to one of the preceding claims, characterized in that the frame ( 22 ) has a column ( 54 ) on which the laser beam source ( 24 ) is adjustable in height. 13. The apparatus according to claim 12, characterized in that a quick release device ( 58 ) is provided for the height adjustment. 14. Device according to one of the preceding claims, characterized in that the frame ( 22 ) or the cross bar ( 56 ) can be aligned on the horizontal. 15. The apparatus according to claim 14, characterized in that for the horizontal alignment two vials ( 80 , 82 ) on the frame ( 22 ) are arranged, and that the frame ( 22 ) or the crossbar ( 56 ) is adjustable about both horizontal axes . 16. The apparatus according to claim 14, characterized in that the column ( 54 ) is arranged on a at three points on a base plate ( 50 ) mounted plate ( 52 ), the plane of the plate ( 52 ) relative to the plane of the base plate ( 50th ) is adjustable. 17. Device according to one of the preceding claims, characterized characterized in that the angle encoder units are designed as it is in so-called wheel aligners is known. 18. The apparatus according to claim 14 and 17, characterized in that for horizontal alignment, the two angle sensors for the camber and Spread measurement can be used.