WO2022042448A1

WO2022042448A1 - Target, four-wheel alignment system and four-wheel alignment method

Info

Publication number: WO2022042448A1
Application number: PCT/CN2021/113835
Authority: WO
Inventors: 罗文荟; 刘连军
Original assignee: 深圳市道通科技股份有限公司
Priority date: 2020-08-28
Filing date: 2021-08-20
Publication date: 2022-03-03
Also published as: CN111879263A

Abstract

A target, comprising a shell (100), a display screen (200) and a control circuit board (300), wherein the control circuit board (300) is electrically connected to the display screen (200) and is used for controlling the display screen (200) to display a preset pattern, so that an external detection device acquires, by means of an image collection apparatus, an image that has the preset pattern, and executes, according to the image, a corresponding detection process on a vehicle to be detected. The preset pattern presented by the target is not formed by means of ink printing, but is instead formed by means of the display of the display screen (200) under the control of the control circuit board (300). The disadvantage of same affecting the display effect of the preset pattern due to ink at the edge of the preset pattern easily being diffused outwards can be effectively avoided. Further disclosed are a four-wheel alignment system and a four-wheel alignment method.

Description

Target, four-wheel alignment system and four-wheel alignment method

This application claims the priority of the Chinese patent application with the application number of 202010884566.0 and the application title of "Target, Four-wheel Alignment System and Four-wheel Alignment Method" filed with the China Patent Office on August 28, 2020, the entire contents of which are by reference Incorporated in this application.

technical field

Embodiments of the present invention relate to the technical field of automobile detection, and in particular, to a target, a four-wheel alignment system and a four-wheel alignment method.

Background technique

With the development of science and technology and the improvement of living standards, the number of residents' cars has grown rapidly, and cars have become the most popular means of transportation for residents. When the car runs for a long time and long distance, the relative position between the four wheels of the car will have a certain deviation, and the position of the sensors in the Advanced Driving Assistance System (ADAS) on the car may also change to some extent. . Generally, whether for four-wheel alignment or calibration and correction of sensors in ADAS, the staff will first install the target on the four wheels of the car, and then detect equipment, such as a four-wheel aligner or calibration equipment, through its The image acquisition device on the target acquires the image with the preset pattern on the target, and performs the corresponding detection process according to the image, such as four-wheel alignment, or calculates the thrust line of the car to adjust the position between the calibration device and the car And calibrate the sensor in ADAS.

Generally, the above-mentioned preset pattern is printed or spray-painted on the target, and the preset pattern is adapted to the model of the vehicle to be tested, and the target is used to be installed on each wheel of the automobile. The image acquisition device acquires an image with the above-mentioned preset pattern, so that the detection device can subsequently perform the above-mentioned detection process.

In the process of realizing the present invention, the inventor of the present invention found that since the preset pattern is formed on the pattern plate by ink printing, and the ink is easily affected by the ambient temperature and humidity, in a high temperature and humid environment, the preset pattern is The ink on the edge of the pattern is easy to spread to the periphery, thus affecting the display effect of the preset pattern.

SUMMARY OF THE INVENTION

The embodiment of the present invention aims to provide a target, a four-wheel positioning system and a four-wheel positioning method, so as to solve the problem that the ink on the edge of the preset pattern is easy to diffuse outward and affect the preset target in a high temperature and humid environment. Technical issues with pattern display effects.

The embodiment of the present invention adopts the following technical solutions to solve its technical problems:

A target comprising:

case;

a display screen mounted on the housing; and

a control circuit board, electrically connected with the display screen, the control circuit board is used to control the display screen to display a preset pattern, so that an external detection device acquires an image with the preset pattern through the image acquisition device, and A corresponding detection process is performed on the vehicle to be tested according to the image.

As a further improvement of the above technical solution, the target is a flat target, the target is a flat target, and the display screen is a flat display screen.

As a further improvement of the above technical solution, the target is a three-dimensional target.

As a further improvement of the above technical solution, the display screen includes a first screen body and a second screen body located on different planes, and both the first screen body and the second screen body are electrically connected to the control circuit board connect.

As a further improvement of the above technical solution, the display screen further includes a third screen body that is electrically connected to the control circuit board, one end of the third screen body is connected to the first screen body, and the other end is connected to the first screen body. The second screen is connected.

As a further improvement of the above technical solution, the display screen is an LCD display screen or an LED display screen or an OLED display screen.

As a further improvement of the above technical solution, it also includes a data communication interface;

The control circuit board includes a circuit board, a processor mounted on the circuit board, and a memory mounted on the circuit board;

The data communication interface is electrically connected with the processor, and the data communication interface is used for communication connection with an external device.

As a further improvement of the above technical solution, an input module is also included, the input module is electrically connected to the control circuit board, and the input module is used for receiving an instruction input by a user;

The control circuit board is used for controlling the display screen to display the preset pattern according to the instruction.

As a further improvement of the above technical solution, the input module is electrically connected to the processor through the communication interface.

As a further improvement of the above technical solution, the control circuit board can store more than two preset patterns;

The control circuit board is used for selecting and calling one of the two or more preset patterns, and controlling the display screen to display.

As a further improvement of the above technical solution, the control circuit board is further configured to control the display position and/or display size of the preset pattern on the display screen.

As a further improvement of the above technical solution, it also includes a battery, the battery is accommodated in the casing, the battery is respectively connected to the control circuit board and the display screen, and the battery is used for the control circuit The board and the display screen are powered.

As a further improvement of the above technical solution, an installation shaft is also included, one end of the installation shaft is connected to the housing, and the target can be mounted on an external structure through the installation shaft.

As a further improvement of the above technical solution, the preset pattern includes at least one of a circle pattern, a dot pattern, a checkerboard pattern and a two-dimensional code pattern.

As a further improvement of the above technical solution, the detection device is a four-wheel aligner or a calibration device.

The embodiment of the present invention also adopts the following technical solutions to solve its technical problems:

A four-wheel positioning system, comprising:

bracket;

an image capture device mounted on the bracket; and

As with the above target, the target is used to be mounted on a wheel, and the image acquisition device is used to acquire an image with a preset pattern displayed by the target.

As a further improvement of the above technical solution, the support includes a base, a vertical frame assembly and a beam assembly;

The bottom of the base includes a driving wheel, the stand assembly is mounted on the base and extends in a vertical direction, and the beam assembly is mounted on the stand assembly and extends in a horizontal direction;

The image acquisition device is mounted on the beam assembly.

A four-wheel alignment method, applied to the above-mentioned four-wheel alignment system, includes:

controlling the display screen to display a preset pattern;

The image acquisition device is controlled to acquire an image with information of the preset pattern.

The beneficial effects of the present invention are:

The target provided by the embodiment of the present invention includes a casing, a display screen, and a control circuit board. Wherein, the control circuit board is electrically connected to the display screen, and is used to control the display screen to display a preset pattern, so that the external detection equipment acquires an image with the preset pattern through the image acquisition device, and executes the operation of the vehicle to be tested according to the image. corresponding detection process.

Compared with the target currently on the market, the preset pattern presented by the target provided by the embodiment of the present invention is not formed by ink printing, but is formed by the display screen under the control of the control circuit board. Therefore, the target provided by the embodiment of the present invention can effectively avoid the disadvantage that the display effect of the preset pattern is affected because the ink at the edge of the preset pattern is easily diffused outward.

Description of drawings

One or more embodiments are exemplified by the accompanying drawings, which are not intended to limit the embodiments, and elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. It is stated that the figures in the accompanying drawings do not constitute a scale limitation.

FIG. 1 is a three-dimensional schematic diagram of a target provided by one embodiment of the present invention;

Fig. 2 is the exploded schematic diagram of the target in Fig. 1;

3 is a schematic diagram of a form of a preset pattern provided by the present invention;

4 is a schematic diagram of another form of the preset pattern provided by the present invention;

5 is a schematic diagram of another form of the preset pattern provided by the present invention;

FIG. 6 is a three-dimensional schematic diagram of a target provided by another embodiment of the present invention;

FIG. 7 is a schematic flowchart of a four-wheel alignment method according to an embodiment of the present invention.

detailed description

In order to facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to"/"fixed to"/"mounted to" another element, it can be directly on the other element, or there may be one or more intervening elements therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention. The terms used in the description of the present invention are only for the purpose of describing specific embodiments, and are not used to limit the present invention. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In this specification, the "installation" includes welding, screwing, snapping, gluing, etc. to fix or restrict a certain element or device to a specific position or place, and the element or device can be held in a specific position or place. It can also move within a limited range without moving, and the element or device can be disassembled or not disassembled after being fixed or limited in a specific position or place, which is not limited in the embodiment of the present invention.

Please refer to FIG. 1 and FIG. 2 together, which show a three-dimensional schematic diagram and an exploded view of a target according to an embodiment of the present invention. The target includes a casing 100 , a display screen 200 and a control circuit board 300 . The housing 100 is used for installing the display screen 200 and the control circuit board 300 . The control circuit board 300 is electrically connected to the display screen 200, and is used for controlling the display screen 200 to display a preset pattern, so that an external detection device acquires an image with the preset pattern through the image acquisition device, and according to the image, the vehicle to be tested is Perform the corresponding detection procedure. Next, in this embodiment, the target is a plane target applied to a four-wheel aligner, that is, the above-mentioned detection device performs four-wheel alignment of the vehicle to be tested according to a preset pattern, as an example, and the specific structure of the target is described in detail. illustrate. It can be understood that the target is not limited to be applied to a four-wheel aligner. In other embodiments of the present invention, the target can also be applied to other detection equipment, and the present invention does not specify its specific application scenarios and environments. For example, it can also be applied to automobile calibration equipment, so that the automobile calibration equipment can be placed in the correct position according to the obtained preset pattern, so as to facilitate the calibration equipment to calibrate the sensors on the vehicle to be tested.

Please refer to FIG. 2 for the above-mentioned housing 100 , which includes a rear housing 110 and a front frame 120 . One end surface of the rear shell 110 is provided with a receiving cavity 111 . In this embodiment, the open end of the receiving cavity 111 is rectangular. The front frame 120 has a rectangular frame-like structure as a whole, which is matched with the open end of the accommodating cavity 111 , and is embedded in the open end of the accommodating cavity 111 and fixed. It can be understood that, in other embodiments of the present invention, the open end of the accommodating cavity 111 and the front frame 120 may also be other shapes than rectangles, as long as the shapes of the two are the same and the sizes are suitable.

For the above-mentioned display screen 200 , please continue to refer to FIG. 2 , the display screen 200 is a flat display screen with a rectangular shape as a whole, which is accommodated in the above-mentioned receiving cavity 111 , and the edge of the display screen 200 is kept fixed under the clamping action of the rear shell 110 and the front frame 120 . . At least a part of the panel of the display screen 200 is exposed to the outside through the through hole structure in the middle of the front frame 120 for the user to observe. Optionally, the display screen 200 is an LCD display screen, an LED display screen or an OLED display screen.

For the above-mentioned control circuit board 300 , please continue to refer to FIG. 2 , the control circuit board 300 is accommodated in the above-mentioned accommodating cavity 111 and fixed to the casing 100 . The control circuit board 300 is electrically connected to the display screen 200 for controlling the display screen 200 to display a preset pattern. Specifically, the control circuit board 300 includes a circuit board (not shown in the figure), a processor (not shown in the figure), a memory (not shown in the figure) and other structures mounted on the circuit board. Wherein, the processor and the memory may be connected by a bus or in other ways, and the display screen 200 is connected with the bus. As a non-volatile computer-readable storage medium, the memory can be used to store non-volatile software programs, non-volatile computer-executable programs and modules. The processor executes the steps performed by the control circuit board described above or below by executing non-volatile software programs, instructions, and modules stored in memory. The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system and an application program required by at least one function; the storage data area may store the above-mentioned preset patterns and the like. Additionally, the memory may include high speed random access memory, and may also include nonvolatile memory, such as at least one magnetic disk storage device, flash memory device, or other nonvolatile solid state storage device. The program instructions/modules are stored in the memory and, when executed by the one or more processors, perform the steps performed by the control circuit board described above. It is worth mentioning that the "electrical connection" described in this specific embodiment means that the communication of electrical signals can be realized between the two structures, which can be a wired electrical connection realized by a cable, or can be realized through a cable. Wireless connection implemented by Bluetooth, WiFi module, etc.

It is worth mentioning that the above-mentioned "preset patterns" are pre-stored patterns in the memory of the control circuit board 300 that correspond to the vehicle to be tested; the preset patterns corresponding to different vehicle models are generally different, of course. , in some cases, it may be the same. It should be understood that the present invention does not specifically limit the corresponding relationship between the preset pattern and the vehicle model, and the description here is only to facilitate the understanding of the preset pattern. Please refer to FIG. 3, which shows a form of a preset pattern; the preset pattern is a pattern combination including at least one circle and at least one dot, wherein each circle is arranged and distributed in the form of a rectangular array, and each circle Points are placed in the circles in some of them. Please refer to FIG. 4 , which shows another form of the preset pattern; the preset pattern includes a checkerboard pattern, and the checkerboard pattern includes rectangular blocks of two colors, and each rectangular block is adjacent to its adjacent The rectangular blocks are of different colors. Please refer to FIG. 5 , which shows yet another form of the preset pattern, where the preset pattern includes a two-dimensional code. It should be understood that even though this embodiment only lists three types of preset patterns, the present invention does not specifically limit the specific shapes of the preset patterns, for example, it may also include circle patterns, dot patterns, checkerboard patterns And a variety of combinations in the two-dimensional code pattern.

As for the source of the aforementioned preset pattern, it can be obtained by means of wired communication and/or wireless communication. For example, in some embodiments of the present invention, the target further includes a data communication interface (not shown in the figure), and the target realizes the acquisition of the above-mentioned preset pattern through the data communication interface. Specifically, the data communication interface is electrically connected to the processor in the control circuit board, which is used for communication connection with external devices, such as U disk, mobile phone, tablet, computer, etc., so that the processor can obtain the preset pattern and stored in memory for subsequent calls by the processor. The present invention does not specifically limit the fixing method of the data communication interface; the data communication interface may be integrated on the control circuit board 300, and then a corresponding port on the housing 100 is opened to facilitate the Cooperate with the interface of the external device; the data communication interface can also be integrated on the display screen 200, and then open a corresponding port in the corresponding part of the front frame 120 to facilitate the interface with the external device Plug fit. For example, in other embodiments of the present invention, the target may also receive the preset pattern from an external device, such as a mobile phone, tablet, computer, etc., in a wireless communication manner through the processor and store it in the memory, In order to facilitate subsequent calls by the processor.

Preferably, the memory in the control circuit board 300 can store two or more preset patterns, and the processor in the control circuit board 300 can choose to call one of the two or more preset patterns, and control the display screen 200. display it. Therefore, the target can be adapted to a variety of models at the same time, with high flexibility.

Further, in order to facilitate the user to display a desired preset pattern on the display screen 200 as required, the target further includes an input module (not shown). Specifically, the input module is electrically connected to the control circuit board, which can interact with the user, and is used for receiving an instruction input by the user. More specifically, the user triggers the input module, so that the input module receives the instruction input by the user, and transmits the instruction to the control circuit board 300 . The control circuit board 300 is used for controlling the display screen 200 to display the preset pattern desired by the user according to the instruction. Optionally, the controller is further configured to control the display position and/or display size of the preset pattern on the display screen 200 . In this embodiment, the input module includes a remote control, which is wirelessly connected to the processor. The user can control the display screen 200 to switch and display the preset pattern by triggering buttons on the remote control, and adjust the preset pattern on the display screen. Display position and/or display size on 200. Among them, by adjusting the display position and display size of the preset pattern, the installation accuracy of the target can be reduced to a certain extent, thereby improving the disassembly and assembly efficiency of the target. In other embodiments, the above-mentioned input module may also be electrically connected to the processor through the above-mentioned data communication interface, such as a keyboard, a touch screen, and the like. In addition, in other embodiments of the present invention, the input module may also include at least one of a remote control, a touch screen, a keyboard, a mouse, and a button, which are not detailed here, as long as it can interact with the user, accept the user's instructions.

Further, the target also includes a battery. Specifically, please refer back to FIG. 2 , and in conjunction with other drawings, the battery 400 is accommodated in the accommodating cavity of the housing 100 and fixed to the side of the display screen 200 away from the front frame 120 . The battery 400 is connected to the control circuit board 300 and the display screen 200 respectively, and is used for supplying power to the control circuit board 300 and the display screen 200 to realize communication between the control circuit board 300 and the display screen 200 and display of preset patterns. It can be understood that, in other implementations of the present invention, the target may not include a battery, but use an external power supply to achieve the above purpose.

Further, in order to facilitate the disassembly and assembly of the target, the target further includes an installation shaft 500 . Specifically, referring to FIG. 1 and FIG. 2 , one end of the mounting shaft 500 is fixed to the rear shell 110 of the housing 100 , and the other end is used to connect with an external structure (eg, a wheel hub clamping mechanism).

The target provided by the embodiment of the present invention includes a casing 100 , a display screen 200 and a control circuit board 300 . The housing 100 is used for installing the display screen 200 and the control circuit board 300 . The control circuit board 300 is used to control the display screen 200 to display a preset pattern, so that an external detection device, such as a four-wheel aligner or a car calibration device, acquires an image with the preset pattern through the image acquisition device, and treats the image according to the image. The test vehicle performs the corresponding test process.

Compared with the target currently on the market, the preset pattern presented by the target provided by the embodiment of the present invention is not formed by ink printing, but is formed by the display screen under the control of the control circuit board. Therefore, the target provided by the embodiment of the present invention can effectively avoid the disadvantage that the display effect of the preset pattern is affected because the ink at the edge of the preset pattern is easily diffused outward. In addition, when calibrating or four-wheel alignment for different vehicle models, the target only needs to be switched to display different preset patterns through the control circuit board 300 to control the display screen 200 to adapt to different vehicles to be tested, without frequent replacement , Disassemble and assemble the target. Therefore, the target provided by the embodiment of the present invention has high flexibility and can be adapted to different vehicle types.

Please refer to FIG. 6 , which shows a three-dimensional schematic view of the target provided by another embodiment of the present invention. Please refer to FIGS. 1 to 5 at the same time. In order to distinguish it from the target in the first embodiment, the following will be The target in the first embodiment is referred to as the first target, and the target in the second embodiment is referred to as the second target. The second target and the first target have roughly the same composition and structure, and the main difference between the two is in:

The first target is a flat target, and accordingly, the display screen 200 is a flat display screen;

The second target is a three-dimensional target, which includes a housing 100 ′, a display screen 200 ′, a control circuit board (not shown in the figure), a battery (not shown in the figure), and a mounting shaft (not shown). Wherein, the display screen 200' includes a first screen body and a second screen body located on different planes, that is, the display area parts of the display screen 200' do not all lie on the same plane.

Referring to FIG. 6 , the display screen 200 ′ is Z-shaped as a whole, and includes a first screen body 210 ′, a third screen body 230 ′ and a second screen body 220 ′ connected in sequence. Correspondingly, the shape of the housing 100 ′ Adaptive adjustment. In this embodiment, the first screen body 210', the second screen body 220' and the third screen body 230' are all straight and are electrically connected to the control circuit board respectively. The first screen body 210' and the second screen body The bodies 220' are located on different planes. One end of the third screen body 230' is connected to the first screen body 210', and the other end is connected to the second screen body 220' to form the above-mentioned zigzag curved display screen. Optionally, smooth transitions are made between the first screen body 210' and the second screen body 220' and between the second screen body 220' and the third screen body 230' to reduce local stress; In other embodiments of the invention, sharp corner transitions may be formed between the first screen body 210' and the second screen body 220', and between the second screen body 220' and the third screen body 230', respectively.

It should be understood that even though the display screen 200 ′ in this embodiment is an integrated curved display screen composed of the first screen body 210 ′, the third screen body 230 ′ and the second screen body 220 ′ connected in sequence, the present invention does not Limited to this; for example, in some other embodiments, the display screen 200' only includes the first screen body 210' and the second screen body 220' located on different planes, and there is no physical connection between the two. That is, both are flat displays and separate setups.

Compared with the first target in the first embodiment, the second target is a three-dimensional target, which includes a first screen body 210' and a second screen body 220' located on different planes. The first screen body 210' Both the second screen body 220' and the second screen body 220' can be used to display the preset pattern; then, when the external image acquisition device acquires an image with the preset pattern on the second target, it can be respectively relative to the first screen body according to the wheel to be tested. Whether the physical positions of 210' and the second screen body 220' are matched, and then determine whether the second target (stereo target) itself is deformed, so as to facilitate the staff to know the situation and adjust the stereo target in time .

Based on the same inventive concept, an embodiment of the present invention further provides a four-wheel alignment system (not shown in the figure), the four-wheel alignment system includes a four-wheel alignment instrument and the above-mentioned target. The four-wheel aligner includes a bracket and an image acquisition device. Specifically, the bracket includes a base, a stand assembly and a beam assembly. The bottom of the base includes a driving wheel, the vertical frame assembly is mounted on the base and extends in the vertical direction, and the beam assembly is installed on the vertical frame assembly and extends in the horizontal direction. The target is used to mount on the wheel of the vehicle to be tested. The image acquisition device is mounted on the beam assembly of the bracket, and is used for acquiring an image with the preset pattern displayed by the aforementioned target.

Due to the above targets, the targets in the four-wheel alignment system provided by the embodiments of the present invention are highly flexible and can be adapted to different vehicle models. Accordingly, the four-wheel alignment system itself can also be adapted to different vehicle types.

Based on the same inventive concept, the present invention also provides a four-wheel alignment method, which is applied to the above-mentioned four-wheel alignment system. Please refer to FIG. 7 , which shows a schematic flowchart of the four-wheel alignment method. Please also refer to FIG. 1 5, the four-wheel alignment method includes:

S0: Install the target on the wheel of the vehicle to be tested.

S1: Control the display screen 200 to display a preset pattern. Specifically, after the target is installed on the wheel, the control circuit board 300 controls the display screen 200 to display a preset pattern suitable for the vehicle type to be tested. The present invention does not specifically limit the acquisition source of the preset pattern. The preset pattern can either be acquired by the control circuit board 300 from an external device through a data communication interface and stored in its own memory, or received through wireless transmission. Sent by an external device and stored in its own memory. But it is worth mentioning that, no matter which acquisition method is used, the process of acquiring the preset pattern is before the display screen 200 displays the preset pattern.

S2: Control the image acquisition device to acquire an image with the preset pattern. Specifically, the control circuit board 300 controls the image acquisition device to obtain the preset pattern displayed by the target on each wheel, and analyzes the relative position between the steering mechanism of each wheel and the front and rear axles by means of an algorithm, so as to facilitate the staff to Wheels are adjusted to the correct position.

Because the four-wheel alignment method can display different preset patterns by controlling the display screen in the target to adapt to different vehicle models, that is, the four-wheel alignment method has the characteristics of high flexibility and can be applied to different vehicle types.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, The steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been The skilled person should understand that it is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the implementation of the present invention. scope of technical solutions.

Claims

A target for being mounted on a wheel of a vehicle to be tested, characterized in that it includes:

case;

a display screen mounted on the housing; and

a control circuit board, electrically connected with the display screen, the control circuit board is used to control the display screen to display a preset pattern, so that an external detection device acquires an image with the preset pattern through the image acquisition device, and A corresponding detection process is performed on the vehicle to be tested according to the image.
The target according to claim 1, wherein the target is a flat target, and the display screen is a flat display screen.
The target according to claim 1, wherein the target is a three-dimensional target.
The target according to claim 3, wherein the display screen comprises a first screen body and a second screen body located on different planes, and the first screen body and the second screen body are both connected to the The control circuit board is electrically connected.
The target according to claim 4, wherein the display screen further comprises a third screen body electrically connected to the control circuit board, and one end of the third screen body is connected to the first screen body connected, and the other end is connected to the second screen.
The target according to claim 1, wherein the display screen is an LCD display screen or an LED display screen or an OLED display screen.
The target of claim 1, further comprising a data communication interface;

The control circuit board includes a circuit board, a processor mounted on the circuit board, and a memory mounted on the circuit board;

The data communication interface is electrically connected to the processor, and the data communication interface is used for communication connection with an external device.
The target according to claim 7, further comprising an input module, the input module is electrically connected to the control circuit board, and the input module is used for receiving an instruction input by a user;

The control circuit board is used for controlling the display screen to display the preset pattern according to the instruction.
The target according to claim 8, wherein the input module is electrically connected to the processor through the communication interface.
The target according to claim 1, wherein the control circuit board can store more than two preset patterns;

The control circuit board is used for selecting and calling one of the two or more preset patterns, and controlling the display screen to display.
The target according to claim 1, wherein the control circuit board is further configured to control the display position and/or display size of the preset pattern on the display screen.
The target according to claim 1, further comprising a battery, the battery is accommodated in the casing, the battery is respectively connected to the control circuit board and the display screen, and the battery is used for Supply power to the control circuit board and the display screen.
The target according to claim 1, further comprising a mounting shaft, one end of the mounting shaft is connected to the housing, and the target can be mounted on an external structure through the mounting shaft.
The target according to claim 1, wherein the preset pattern comprises at least one of a circle pattern, a dot pattern, a checkerboard pattern and a two-dimensional code pattern.
The target according to claim 1, wherein the detection device is a four-wheel aligner or a calibration device.
A four-wheel positioning system, characterized in that, comprising:

bracket;

an image acquisition device mounted on the bracket; and

The target according to any one of claims 1 to 15, wherein the target is installed on a wheel, and the image acquisition device is used for acquiring an image having a preset pattern displayed by the target.
The four-wheel alignment system according to claim 16, wherein the bracket comprises a base, a stand assembly and a beam assembly;

The bottom of the base includes a driving wheel, the vertical frame assembly is installed on the base and extends in a vertical direction, and the beam assembly is installed on the vertical frame assembly and extends in a horizontal direction;

The image acquisition device is mounted on the beam assembly.
A four-wheel alignment method, applied to the four-wheel alignment system as claimed in claim 16 or 17, characterized in that, comprising:

controlling the display screen to display a preset pattern;

The image acquisition device is controlled to acquire an image with the preset pattern.