DE102018113138A1 - Arrangement and method for detecting and / or evaluating vibrations - Google Patents

Abstract

The invention relates to an arrangement for detecting and / or evaluating vibrations of a body of a vehicle, in particular a motor vehicle, comprising at least one threshold, at least two optical detection devices, in particular cameras, for directly detecting vibration-dependent position data of the body, an evaluation device for evaluating the position data.

Description

The invention relates to an arrangement and a method for detecting and / or evaluating vibrations of a body of a vehicle.

Vibration measurements are known in principle. For example, disclose DE 10 2008 016 746 A1 and DE 10 2012 221 491 A1 an arrangement and a method for vibration measurement of structural components and bodies, such as vehicles. The revelations of DE 10 2008 016 746 A1 and DE 10 2012 221 491 A1 , in particular in connection with the evaluation of the measured values, are explicitly included.

For the measurement, a vibration sensor with a piezoelectric sensor or an acceleration sensor is used.

The disadvantage of this is that the sensor or acceleration sensor must first be attached to the vehicle before the vibration measurement can be performed. This is relatively cumbersome and time consuming.

It is therefore an object of the invention to improve an arrangement and a method of the type mentioned in that can be detected and evaluated in a simple and fast way vibrations of a body of a vehicle.

The solution of this object is achieved by the arrangement and the method of the independent claims.

According to the invention, the arrangement for detecting and / or evaluating vibrations of a body of a vehicle, in particular a motor vehicle, e.g. Passenger cars, trained or can be used.

The term vehicle is to be understood broadly and includes, for example, bicycles, pedelecs, e-bikes, motorcycles, scooters, mopeds, SUVs, off-road vehicles, quads, trucks, tractors, construction machines, trikes, threewheelers and / or aircraft.

The arrangement comprises at least one threshold. In particular, the threshold may be expressed as, e.g. cuboid, plate be formed.

The threshold may comprise or consist of a plastic, metal, wood and / or concrete material. If the threshold is simply placed on the ground, it may in particular have a friction-increasing or friction-increasing structure on the underside and / or a friction-increasing material, e.g. a rubber material. Alternatively or additionally, the threshold can also be firmly connected to the ground, in particular screwed.

The threshold may e.g. between 2 cm and 10 cm, preferably 4 cm, be high. The width may e.g. between 20 cm and 80 cm, preferably 60 cm.

The threshold may, in particular, be continuous and e.g. have a length of about 2 m. However, the threshold may also be shared, e.g. in one meter long sections. The sections may also be shorter, e.g. between 50 cm and 80 cm, preferably 60 cm. In particular, the threshold can be easily transported and e.g. also be used mobile.

The section may in particular be square, e.g. with a dimension of 60 cm x 60 cm x 4 cm.

If the threshold for the left and right sides of the vehicle is not continuous, the threshold sections should be at the same height. The wheels on the left and right pass in this case at the same time the threshold sections.

Alternatively, the threshold sections may also be offset from each other, for example by about 1 m. Thus, the vehicle may e.g. first with the left wheel drive over a threshold section, the vehicle only after about 1 m with the right wheel on the other threshold section moves.

The threshold can be laid in particular when entering a workshop. Each vehicle that drives into the workshop thus automatically passes the threshold. The detection of the vibration can therefore take place already at the entrance of the vehicle, whereby time is saved.

The arrangement comprises at least two, preferably four, optical detection devices for the immediate detection of vibration-dependent position data of the body. The detection devices may be e.g. to act, especially high-resolution, cameras. Preferably, the cameras can work in the visible range.

In particular, on each side several, e.g. two, cameras are located. The position data, e.g. Distances, can be detected in particular by means of stereo vision.

The detection devices detect the position data of the body immediately, ie the Body itself is detected, for example by means of image recognition. Preferably, a contour of the body is detected. It is thus to a certain extent a body detection device.

In particular, a lower edge of the body is detected, for example in the area of the wheel house. In particular, a vertex of the wheel arch can be used. The vertex may e.g. lie over the middle of the wheel. Basically, however, any static, i. non-rotating, components or contours of the vehicle conceivable.

In particular, the detection devices do not require any reference devices which are fastened to the body or projected onto the body. Mechanical components and / or light patterns or the like are not provided as a reference for the detection devices in particular.

It was surprising that a detection of position data directly on the body itself by the detection devices is possible. In this way, time and thereby costs can be saved because no reference devices must be mounted on the vehicle and / or calibrated.

Optionally, a lighting device is conceivable to provide a better contrast for the detection devices.

The position data may in particular be relative positions, e.g. Distances, the body with respect to the soil, in particular a bottom plate, or the threshold act. The position data are detected in particular time-dependent and / or location-dependent. For example, before or at the beginning of the threshold, at a vertex of the threshold and / or after the vertex or to about two to three meters behind the threshold.

The arrangement comprises an evaluation device for evaluating the position data. For example, vibration data can be determined from the, in particular time and / or location-dependent, position data. From the vibration data, e.g. the functionality of a chassis, in particular a suspension, preferably a spring and / or a shock absorber, so vibration damper, are checked. Also other components of the chassis, e.g. Bushings, can be checked. For this purpose, the determined data can for example be compared with reference data. In particular, prior measurements, e.g. with new shock absorbers, are used. Also, the shock absorbers of a vehicle can serve as a reference for each other. For example, a deviation of the vibration data of a shock absorber from the vibration data of the other shock absorbers of the vehicle may indicate a defect.

According to the invention can therefore be detected and evaluated in a simple and fast way vibrations of a body of a vehicle.

Further developments of the invention can be found in the dependent claims, the description and the accompanying drawings.

According to one embodiment, the optical detection devices, e.g. in pairs, arranged on opposite sides. In particular, both sides of the vehicle can thereby be detected at the same time. For example, the suspension of both front wheels or both rear wheels can be checked at the same time. This can save time and thus costs.

The detection devices are in particular directed in opposite directions and / or towards each other. As a result, different, in particular opposite, sides of the body can be detected. Thus, a detection device, e.g. a left side of the body and the other detection device to detect a right side of the body.

According to a further embodiment, at least one transmitting device is provided, which is designed to send the position data to the evaluation device.

The transmission can preferably take place wirelessly, in particular by means of mobile transmission technologies such as UMTS, GSM, LTE, 5G, Bluetooth, infrared, WLAN or the like.

For example, the detection devices may each have a transmitting device. Thus, e.g. be integrated into a camera a transmission module.

The position data are preferably sent to an external evaluation device. The evaluation is thus not made on site in particular. Preferably, a central evaluation center, e.g. on a server, provided. The evaluation center can receive, save, evaluate and / or visualize the position data. In particular, position data from different measuring processes of the same vehicle and / or of different vehicles can be processed there at different locations or at different times.

For example, data from the same vehicle can be stored over a longer period of time and, if necessary, retrieved or compared with current measurements. As a result, in particular a "trend course" of the chassis condition can be determined.

If necessary, fault-prone and / or maintenance-prone evaluation devices on site can therefore be dispensed with. Furthermore, no high computing power must be provided locally. The safety of the measured data is also improved.

In addition, the evaluation center allows access for different customers, e.g. Testing organizations, vehicle manufacturers or tuners.

The evaluated data can then be returned for further processing or display. For example, a receiving device may be provided at the location of the detecting device. As a receiving device, e.g. a computer, in particular desktop computer, tablet PC, laptop, or a smartphone and / or printer be provided.

For example, the result of the evaluation, preferably automatically, be entered in a test report. Also, e.g. defective parts are ordered automatically.

Alternatively, the evaluation can also be made on-site, for example by means of a computer, in particular a desktop computer, tablet PCs, laptops and / or a smartphone. Thus, e.g. an App be provided for evaluation.

In accordance with a further embodiment, the evaluation device is designed to check the functionality of a chassis, in particular a wheel suspension, preferably a spring and / or a shock absorber, on the basis of the position data.

The position data allow conclusions about the functionality of various components of the chassis, e.g. the damper pin and / or the strut.

In the case of a defect, in particular larger vibration values are generated. This is preferably recognized by the evaluation device. For example, the result can be categorized with a so-called traffic light function. Thus, e.g. low vibration values correspond to a green area. Higher vibration values may correspond to an orange range. If necessary, this may require the assessment of an examiner. Very high vibration values can be assigned to a red area. This may result in a repair or replacement of the defective component or a refusal of a badge.

According to a further embodiment, the evaluation device is designed to determine acceleration values from the position data. For this purpose, the position or time-dependent position data can be used. From the position data, the temporal change of the oscillation speed of the body can be determined.

This has the advantage that the same evaluation software can be used as when measuring by means of an accelerometer.

Is e.g. a shock absorber intact, the acceleration values may be in the range of about 2 to 3 mm / s. With a correspondingly high threshold, the values can also be around 12 to 15 mm / s.

For shock absorbers having a decreasing damper effect, the acceleration values are in the range of about 5 to 10 mm / s. At a correspondingly high threshold, the values can also be around 40 mm / s.

If the shock absorbers are defective, the acceleration values are in the range of approximately 30 to 40 mm / s. At a correspondingly high threshold, the values can also be about 70 to over 100 mm / s.

According to another embodiment, an identification device is provided for identifying the vehicle. For example, the license plate of the vehicle may be detected, e.g. by means of a camera.

The vehicle can then be registered in particular. The position data can thus be assigned to a specific vehicle.

The review of the functionality of a chassis can be carried out in particular fully automated. Even autonomous vehicles can be checked in this way.

According to a further embodiment, the arrangement is designed as part of a test stand. The test bench may in particular be a roller brake tester.

Especially when entering the test bench, the vibrations of the body can be detected. The detection can thus be done virtually incidentally and costs thereby no extra time. Alternatively, a separate measurement process is conceivable.

The invention also relates to a method for detecting and / or evaluating vibrations of a body of a vehicle, in particular a motor vehicle.

The body of the vehicle is set in vibration. Vibration-dependent position data of the body are detected immediately. The position data are then evaluated.

In this way, e.g. the functionality of a chassis of a vehicle to be checked.

In one embodiment, the vehicle is vibrated by being moved over at least one threshold. This can be done, for example, when entering a test stand.

According to another embodiment, position data of opposite sides of the body are detected at the same time. For example, the suspensions of both front wheels and both rear wheels can be detected at the same time. This can save time and thus costs.

All of the embodiments and components of the arrangement described herein are particularly adapted, e.g. by means of a control device to be operated according to the method described herein. Furthermore, all embodiments of the arrangement described here as well as all embodiments of the method described here can each be combined with each other, in particular also detached from the specific embodiment in the context of which they are mentioned.

• 1 eine Draufsicht einer Ausführungsform einer erfindungsgemäßen Anordnung, und
• 2 eine Seitenansicht der Ausführungsform einer erfindungsgemäßen Anordnung.

The invention will now be described by way of example with reference to the drawings. Show it:

• 1 a plan view of an embodiment of an inventive arrangement, and
• 2 a side view of the embodiment of an inventive arrangement.

First, it should be noted that the illustrated embodiments are merely exemplary in nature. Thus, individual features can be realized not only in the combination shown, but also in isolation or in other technically meaningful combinations. For example, the features of one embodiment may be arbitrarily combined with features of another embodiment.

If a figure contains a reference numeral which is not explained in the directly associated descriptive text, reference is made to the corresponding preceding or following statements in the description of the figures. Thus, the same reference numerals are used for the same or comparable components in the figures and these are not explained again.

1 shows as a car 10 trained vehicle with a body 12 and a license plate 14 , The vehicle 10 is located in an arrangement for detecting vibrations of the body 12 ,

The arrangement has a threshold 16 on, over which the vehicle 10 For example, at a speed of 2 to 10 km / h, preferably from 3.5 to 5 km / h, can be moved and vibrated. The vehicle 10 can drive over the threshold or be pulled over or pushed.

Time and / or location-dependent positions of the body 12 can by means of two, on opposite sides of the vehicle 10 arranged, as cameras 18 trained, optical detection devices are detected.

The optical detection devices 18 in particular, in each case a transmitting device 20 respectively. Alternatively, the detection devices 18 the acquired data also transmitted eg via a cable connection to a common transmitting device.

About the transmitting devices 20 The collected data can be sent to an evaluation device 22 be sent. The evaluation device 22 For this purpose, a transmitting and / or receiving device 24 respectively.

Optionally, one, for example as a camera 26 trained identification device may be provided which the vehicle 10, for example, based on the license plate 14 identified.

Also the identification device 26 can be a transmitting device 20 respectively.

The identification of the vehicle 10 can be done, for example, when entering a test stand. The identification device 26 captures the license plate 14 , This data can be sent via the sending device 20 to the evaluation device 22 be transmitted. The vehicle 10 can then be registered in a database.

When entering the vehicle passes over 10 the threshold 16 , At the same time, the bodywork becomes 12 in Oscillation. The vibration-dependent position data of the body 12 be there by the two cameras 18 recorded, for example, by pictures or videos are recorded. The position data, eg the pictures or videos, are transmitted via the transmitting devices 20 to the evaluation device 22 Posted.

The evaluation device 22 receives this data and evaluates it. By means of software, different time and / or location-dependent data points can be determined from the image or video data. From this, in particular acceleration values can be determined.

The data can be displayed in particular in a diagram. Thereby, e.g. Pressure and / or rebound stages of a shock absorber are applied over time. Thus, when driving up to a threshold, an excitation of the compression stage and when descending an excitation of the rebound of the shock absorber. This can e.g. in units of Newton or Newton x meters, i. Nm, done.

If certain limits are exceeded and / or undershot, this is interpreted as an indication of a defective chassis.

The evaluated data or the result of the evaluation can via the transmitting and / or receiving device 24 be sent back to the place where the measurement takes place and be entered eg in a test report. Also, the result can be graphed.

In 2 a side view is shown. The vehicle 10 will go in the direction R emotional. A wheel 28 moves over the threshold 16 ,

In this case, first the position of the lower edge 30 the body 12 with respect to a soil 32 or the distance between the lower edge 30 and the floor 32 be determined as shown by the double arrow.

Alternatively or additionally, the lower edge of the body 12 in the area of the wheelhouse, in particular at a vertex 31 of the wheel arch. The vertex 31 especially lies above the middle of the wheel. For example, the alteration of the crowning momentum 31 to be captured in the room.

Drives the vehicle 10 over the threshold 16 , the position of the lower edge 30 the body 12 concerning the threshold 16 or the distance between the lower edge 30 and the threshold 16 determined.

When departing from the threshold 16 is again the position of the lower edge 30 the body 12 concerning the soil 32 or the distance between the lower edge 30 and the floor 32 determined. The body swings 12 several times with decreasing amplitude after.

In particular, acceleration values are recalculated from the changed positions in the camera image.

The determined acceleration curve can be adjusted with reference curves. In this way it can be determined if the chassis of the vehicle 10 is in order or has shortcomings.

LIST OF REFERENCE NUMBERS

10

Car, vehicle

12

body

14

license plate

16

threshold

18

Camera, optical detection device

20

transmitting device

22

evaluation

24

Transmitting and / or receiving device

26

Camera, identification device

28

wheel

30

lower edge

31

vertex

32

ground

R

direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008016746 A1 [0002]
• DE 102012221491 A1 [0002]

Claims (10)

Arrangement for detecting and / or evaluating vibrations of a body (12) of a vehicle (10), in particular motor vehicle, comprising at least one threshold (16), at least two, preferably four, optical detection devices (18), in particular cameras, for the direct detection of vibration-dependent position data of the body (12), an evaluation device (22) for evaluating the position data. Arrangement according to Claim 1 , characterized in that the optical detection devices (18) are arranged on opposite sides. Arrangement according to Claim 1 or 2 , characterized in that at least one transmitting device (20) is provided, which is adapted to send the position data to the evaluation device (22), preferably wirelessly. Arrangement according to one of the preceding claims, characterized in that the evaluation device (22) is adapted to check on the basis of the position data, the functionality of a chassis, in particular a suspension, preferably a spring and / or a shock absorber. Arrangement according to one of the preceding claims, characterized in that the evaluation device (22) is designed to determine acceleration values from the position data. Arrangement according to one of the preceding claims, characterized in that an identification device (26) for identifying the vehicle (10) is provided. Arrangement according to one of the preceding claims, characterized in that the arrangement is designed as part of a test stand. Method for detecting and / or evaluating oscillations of a body (12) of a vehicle (10), in particular a motor vehicle, in which the body (12) of the vehicle (10) is vibrated, vibration-dependent position data of the body (12) are detected immediately, and the position data are evaluated. Method according to Claim 8 , characterized in that the vehicle (10) is vibrated by being moved over at least one threshold (16). Method according to Claim 8 or 9 , characterized in that at the same time position data of opposite sides of the body (12) are detected.

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