Calibration system based on range finder and four-wheel aligner

Abstract

The utility model is suitable for the technical field of vehicle detection, and provides a calibration system based on a range finder and a four-wheel aligner, the calibration system based on the range finder comprises a first device and a second device which are used in pairs, and the first device and the second device are used for being arranged on one side, provided with a to-be-detected wheel, of a to-be-detected vehicle. The first equipment comprises a range finder, and the second equipment comprises a calibration part; the range finder of the first equipment is used for acquiring distance information between the range finder and the calibration part of the second equipment on the opposite side; and the control device is connected with the range finder and is used for receiving the distance information from the range finder and processing the distance information. According to the calibration system based on the range finder, the distance information between the calibration system and the second equipment on the opposite side is obtained through the range finder, and the distance information reflects the distance relation and the relative position relation between the first equipment and the second equipment; and the detection accuracy can be ensured.

Description

Technical Field

[0001] The present application relates to the field of vehicle detection technology, and in particular to a calibration system based on a rangefinder and a four-wheel aligner. Background Art

[0002] For vehicles, four-wheel alignment has a significant impact on the safety of the entire vehicle. If the wheel parameters are abnormal, it will directly affect the vehicle's driving safety and daily use.

[0003] A vehicle's four-wheel alignment test uses the calibration and detection device in the wheel aligner to obtain parameter information for each wheel of the vehicle. Specifically, a reference piece for detection is fixedly installed on each wheel, and the calibration and detection device is installed in a fixed position outside the vehicle to be tested. The calibration and detection device detects the reference piece to obtain parameter information for each wheel. Before the calibration test, it is necessary to ensure that the calibration and detection devices on both sides are installed in the predetermined position to ensure that they can accurately perform the four-wheel alignment test on the vehicle.

[0004] In the existing four-wheel aligner, the calibration detection devices on both sides are installed separately, and there may be deviations in the positions of the two, resulting in deviations in the detection of the four-wheel alignment of the vehicle. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a calibration system based on a rangefinder, aiming to solve the technical problem that existing four-wheel aligners have deviations in detecting the four-wheel alignment of a vehicle.

[0006] The embodiment of the present application is implemented as follows: a calibration system based on a rangefinder includes a first device and a second device for use in a pair, wherein the first device and the second device are respectively arranged on a side of a vehicle to be inspected where a tire to be inspected is arranged;

[0007] The first device includes a rangefinder, and the second device includes a calibration element:

[0008] The rangefinder of the first device is used to obtain distance information between the rangefinder and the calibration piece of the second device located on the opposite side;

[0009] The control device is connected to the rangefinder and is used to receive the distance information from the rangefinder and process the distance information.

[0010] In one embodiment, the second device further includes the rangefinder, and the first device further includes the calibration member, the rangefinder of the second device is used to obtain the distance information of the calibration member of the first device; the control device includes a first control module provided in the first device, and a second control module provided in the second device, the first control module being connected to the rangefinder of the first device, and the second control module being connected to the rangefinder of the second device;

[0011] Both the first control module and the second control module are communicatively connected to a control terminal, and the control terminal is used to receive the distance information from the first control module and the distance information from the second control module, and process the two distance information; or, both the first control module and the second control module are communicatively connected to a control terminal, and the first control module is used to receive the distance information obtained by the control device from the second control module, and process the two distance information; or, the first control module is used to receive the distance information from the second control module, and process the two distance information.

[0012] In one embodiment, there are multiple calibration pieces, and the projections of the multiple calibration pieces along the width direction of the vehicle to be inspected do not overlap; along the width direction of the vehicle to be inspected, the distances between at least two of the calibration pieces and the vehicle to be inspected are different; and each calibration piece is provided with at least one calibration point.

[0013] In one embodiment, the number of the calibration pieces is four, the first calibration piece and the third calibration piece are arranged at intervals along the length direction of the vehicle to be inspected; the second calibration piece is located at the lower side of the first calibration piece and on the side of the first calibration piece close to the vehicle to be inspected, and the fourth calibration piece is located at the upper side of the first calibration piece and on the side of the first calibration piece away from the vehicle to be inspected.

[0014] In one embodiment, each calibration member includes a fixing plate and a reflecting plate connected to each other, the lower ends of each fixing plate are connected through a bottom plate, the surface of the reflecting plate facing the vehicle to be inspected is a reflecting plane, and at least a portion of the reflecting plane serves as the calibration point.

[0015] In one embodiment, the rangefinder is located between a plurality of the calibration elements, and the rangefinder includes a plurality of ranging probes, each ranging probe corresponding to a calibration point.

[0016] In one embodiment, the calibration component includes a fixing plate and a reflecting plate connected to each other; a plurality of step surfaces are formed on the side of the reflecting plate facing the vehicle to be inspected, each step surface is a reflecting plane, and at least a portion of the reflecting plane serves as the calibration point.

[0017] In one embodiment, the rangefinder includes at least one of a laser rangefinder, an ultrasonic rangefinder, and an infrared rangefinder.

[0018] In one embodiment, the first device and the second device are both provided with a magnetic seat, and the first device and the second device are arranged on a carrying device that carries the vehicle to be inspected through the magnetic seat, and are respectively located on a side of the vehicle to be inspected where the wheel to be inspected is provided.

[0019] Another object of an embodiment of the present application is to provide a four-wheel aligner, including a calibration system based on a rangefinder as described in the above embodiments, wherein the first device and the second device each include two cameras; the two cameras of the first device are used to obtain image information of auxiliary tools on the front wheels and rear wheels on one side of the vehicle to be inspected, and the two cameras of the second device are used to obtain image information of auxiliary tools on the front wheels and rear wheels on the other side of the vehicle to be inspected; the control device is connected to each of the cameras to receive each of the image information and process the image information.

[0020] The embodiments of the present application provide a calibration system and a four-wheel aligner based on a distance meter. The beneficial effects are as follows: a first device and a second device are used in pairs, the first device and the second device are respectively arranged on the side of the vehicle to be inspected where the wheel to be inspected is provided, the first device includes a distance meter, and the second device includes a calibration part; the distance meter of the first device is used to obtain the distance between it and the calibration part of the second device on the opposite side; the control device is connected to the distance meter and is used to receive distance information from the distance meter and process the distance information. The calibration system based on a distance meter of the present application obtains the distance information between it and the second device on the opposite side through its distance meter. The distance relationship and relative position relationship between the first device and the second device can be detected through the distance information. When a four-wheel alignment test is performed using a four-wheel aligner including the calibration system based on a distance meter, the accuracy of the test can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 11 is a schematic diagram of the overall structure of the first device in the rangefinder-based calibration system provided in an embodiment of the present application;

[0023] Figure 2 is a three-dimensional exploded schematic diagram of a first device in a rangefinder-based calibration system provided in an embodiment of the present application;

[0024] Figure 3 1 is a schematic structural diagram of a calibration component and a detection component in a rangefinder-based calibration system provided in an embodiment of the present application;

[0025] Figure 4 1 is a schematic diagram of a three-dimensional exploded view of a calibration component and a detection component in a rangefinder-based calibration system provided in an embodiment of the present application;

[0026] Figure 5 1 is a schematic structural diagram of a calibration component in a rangefinder-based calibration system provided in an embodiment of the present application;

[0027] Figure 6 This is a structural diagram of a calibration component in a rangefinder-based calibration system provided in an embodiment of the present application;

[0028] Figure 7 2 is another structural schematic diagram of a calibration component in a rangefinder-based calibration system provided in an embodiment of the present application;

[0029] Figure 8 1 is a schematic diagram of a three-dimensional exploded view of a detection component in a rangefinder-based calibration system provided in an embodiment of the present application;

[0030] Figure 9 This is a schematic diagram of the use of the four-wheel aligner provided in an embodiment of the present application.

[0031] The meanings of the marks in the figure are:

[0032] 100 - first device, 200 - second device, 91 - vehicle to be tested, 92 - wheel to be tested, 93 - load-bearing device;

[0033] 1- housing;

[0034] 2-Magnetic base;

[0035] 3-calibration assembly, 30-base plate, 31-rangefinder, 32-calibration component, 322-reflection plate, 3220-reflection plane, 3221-step surface, 325-fixing plate, 33-adapter circuit board;

[0036] 4-detection component, 41-first mounting plate, 42-second mounting plate, 43-camera, 44-fill light;

[0037] 51-first control module;

[0038] 6-Battery;

[0039] 7-Indicator light. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0041] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this patent. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] In order to illustrate the technical solution described in this application, the following is a detailed description with reference to specific drawings and embodiments.

[0043] See also Figure 9 As shown, an embodiment of the present application provides a four-wheel aligner, comprising a distance meter-based calibration system and an auxiliary tool. The distance meter-based calibration system is configured to be mounted outside a vehicle 91 to be inspected, and the auxiliary tool is configured to be fixed to a wheel 92 to be tested on the vehicle 91 to be inspected. The four-wheel aligner directly or indirectly obtains image information related to the wheel 92 to be tested by detecting or probing the auxiliary tool, thereby performing a four-wheel alignment test on the vehicle 91 to be inspected.

[0044] See also Figure 1 and Figure 2 、 Figure 9 As shown, the rangefinder-based calibration system includes a first device 100 and a second device 200 . The first device 100 and the second device 200 are used to be installed at a fixed position outside the vehicle to be inspected 91 and are located on opposite sides of the vehicle to be inspected 91 .

[0045] For example, see Figure 9 As shown, based on the direction of the driving seat, the first device 100 is arranged on the right side of the vehicle to be inspected 91, and is used to detect the right front wheel and the right rear wheel of the vehicle to be inspected 91. The second device 200 is arranged on the left side of the vehicle to be inspected 91, and is used to detect the left front wheel and the left rear wheel of the vehicle to be inspected 91.

[0046] In the embodiment of the present application, the first device 100 includes a rangefinder 31, and the second device 200 includes a calibration element 32 (please refer to Figure 2 The four-wheel aligner further comprises a control device connected to the rangefinder 31 of the first device 100 for receiving the distance information from the rangefinder 31 and processing the distance information.

[0047] In other words, the first device 100 can use its rangefinder 31 to obtain the distance information between itself and the second device 200 on the opposite side. This distance information can be used to detect the relative positional relationship between the first device 100 and the second device 200. In this way, the operator can determine whether the first device 100 and the second device 200 are installed at the same predetermined position. Based on this, when the four-wheel aligner performs four-wheel alignment testing on the wheels 92 to be tested on both sides, the detection accuracy of both can be guaranteed.

[0048] In the technical solution of this embodiment, a first device 100 and a second device 200 are used in pairs. The first device 100 and the second device 200 are respectively arranged on one side of the vehicle 91 to be inspected where the wheel 92 to be inspected is provided. The first device 100 includes a distance meter 31, and the second device 200 includes a calibration part 32. The distance meter 31 of the first device 100 is used to obtain the distance between it and the calibration part 32 of the second device 200 on the opposite side. The control device is connected to the distance meter 31 and is used to receive distance information from the distance meter 31 and process the distance information. The distance meter-based calibration system of the present application obtains the distance information between it and the second device 200 on the opposite side through its distance meter 31. The distance relationship and relative position relationship between the first device 100 and the second device 200 can be detected through the distance information. When a four-wheel alignment test is performed using a four-wheel aligner including a distance meter-based calibration system, the accuracy of the test can be guaranteed.

[0049] The specific type of the rangefinder 31 is not limited. For example, the rangefinder 31 can be at least one of a laser rangefinder, an ultrasonic rangefinder, and an infrared rangefinder.

[0050] In an alternative embodiment, if Figure 2 and Figure 3As shown, the first device 100 also includes a calibration component 32, and the second device 200 also includes a rangefinder 31. Thus, the rangefinder 31 of the second device 200 is used to obtain distance information between it and the calibration component 32 in the first device 100. The control module is connected to the rangefinder 31 of the second device 200 to obtain the distance information provided by the rangefinder 31. In other words, mutual calibration of the first device 100 and the second device 200 is achieved. By mutual calibration of the two distance information, it is possible to further ensure that the first device 100 and the second device 200 are installed at the predetermined location at the same time, and further improve the accuracy of the detection of the two devices.

[0051] The control device may be provided in the first device 100 , or in the second device 200 , or in both the second device 200 and the first device 100 .

[0052] In an optional embodiment, the control device includes a first control module 51 provided in the first device 100, and a second control module provided in the second device 200. The first control module 51 is connected to the rangefinder 31 of the first device 100, and the second control module is connected to the rangefinder 31 of the second device 200. This facilitates the first control module 51 and the second control module to be connected to different rangefinders 31, respectively.

[0053] In this way, the first device 100 and the second device 200 can be as similar in structure as possible, that is, they can be completely identical devices (here, the communication method between the first control module 51 and the second control module is not considered). The first device 100 and the second device 200 can be batch-processed and manufactured according to unified requirements and processes. The following description of this application uses this as an example. Figure 1 and Figure 2 FIG shows a first device 100 including a rangefinder 31 and a calibration member 32. For the first device 100, at least the rangefinder 31 and the calibration member 32 constitute a calibration component 3, see FIG. Figure 2 and Figure 3 shown.

[0054] In one embodiment, the first control module 51 and the second control module are configured to be communicatively connected to a control terminal. The control terminal is used to receive distance information from the first control module 51 and distance information from the second control module, and process the two distance information. The control terminal can be a smart device such as a mobile phone or a smart tablet.

[0055] Alternatively, both the first control module 51 and the second control module are communicatively connected to the control terminal, with the first control module 51 configured to receive the distance information obtained by the control terminal from the second control module and process both distance information. In other words, the control terminal functions as a relay for distance information between the first control module 51 and the second control module. It is understood that the control terminal may also receive and display processing results from the first control module 51.

[0056] Alternatively, the first control module 51 is configured to receive the distance information from the second control module and process the two distance information. In this case, the first control module 51 serves as the main control terminal.

[0057] See also Figure 1 and Figure 2 As shown, in one embodiment, the first device 100 includes a magnetic base 2. The first device 100 is installed at a fixed position outside the vehicle 91 to be inspected via the magnetic base 2. For example, the first device 100 is adsorbed onto a supporting device 93 for supporting the vehicle 91 to be inspected via the magnetic base 2. The supporting device 93 is specifically a lift.

[0058] The magnetic base 2 may include a permanent magnet or an electromagnet.

[0059] like Figure 2 As shown, in one embodiment, the first device 100 and the second device 200 further include a battery 6 for providing the power required for the rangefinder 31 (and the electromagnet), etc. The first device 100 and the second device 200 further include an indicator light 7, which is connected to the control device and is used to display the operating status of the rangefinder 31, etc.

[0060] like Figure 2 As shown, in one embodiment, the first device 100 and the second device 200 further include a housing 1 for housing the aforementioned rangefinder 31, calibration component 32, control device, battery 6, etc. A magnetic base 2 is fixedly connected to one end of the housing 1. The housing 1 can be of any design; it is typically designed to accommodate the relative positioning of the rangefinder 31, calibration component 32, battery 6, control device, etc. within the housing, while also being easily accessible to personnel.

[0061] To ensure the accuracy of relative position calibration between the first device 100 and the second device 200, a plurality of calibration points are provided on the calibration member 32, and the plurality of calibration points are arranged at different positions in space so that the distances from the plurality of calibration points to the rangefinder 31 are different.

[0062] It should be noted that the so-called calibration point is not a point in the strict mathematical sense, but rather an area that can be detected and clearly distinguished by the rangefinder 31. Different areas have different distances from the rangefinder 31. The rangefinder 31 can be equipped with multiple ranging probes, each corresponding to a calibration point.

[0063] For example, in a scenario where both the first control module 51 and the second control module are communicatively connected to a control terminal, and the control terminal is used to receive distance information from the first control module 51 and distance information from the second control module and process the two distance information, multiple distance information pieces are transmitted to the control terminal, which processes each piece of distance information and converts it into multiple coordinate points of the first device 100 in the coordinate system of the second device 200, and multiple coordinate points of the second device 200 in the coordinate system of the first device 100. In this way, mutual calibration of the three-dimensional spatial coordinates between the first device 100 and the second device 200 can be achieved.

[0064] See also Figure 4 、 Figure 5 and Figure 6 As shown, in one embodiment, there are multiple calibration members 32, and the projections of the multiple calibration members 32 along the width direction of the vehicle 91 to be inspected do not completely overlap. At least two calibration members 32 are positioned at different distances from the vehicle 91 to be inspected along the width direction of the vehicle 91 to be inspected. Each calibration member 32 is provided with at least one calibration point. This creates multiple calibration points at different distances from the vehicle 91 to be inspected along its width direction. In other words, at least two calibration members 32 are staggered along the length direction of the vehicle 91 to be inspected, resulting in different distances from the rangefinder 31.

[0065] More specifically, the surface of each calibration member 32 facing the vehicle is a flat surface, which is used as a calibration point. In this way, the surface processing of the calibration member 32 can be simpler.

[0066] Optionally, in one embodiment, there are multiple calibration members 32, with at least two calibration members 32 spaced apart in the length direction of the vehicle 91 to be inspected, at least two calibration members 32 spaced apart in the width direction of the vehicle 91 to be inspected, and at least two calibration members 32 spaced apart in the height direction. In this way, multiple calibration points have coordinates on each coordinate axis in the three-dimensional coordinate system, and the control module can calibrate the positions of the calibration members 32 more accurately.

[0067] More specifically, see Figure 4 and Figure 5 As shown, in an optional embodiment, the number of calibration pieces 32 is four, and the first calibration piece 32 and the third calibration piece 32 are arranged at intervals along the length direction of the vehicle to be inspected 91; the second calibration piece 32 is located on the lower side of the first calibration piece 32 and on the side of the first calibration piece 32 close to the vehicle to be inspected 91, and the fourth calibration piece 32 is located on the upper side of the first calibration piece 32 and on the side of the first calibration piece 32 away from the vehicle to be inspected 91.

[0068] The rangefinder 31 is positioned near the calibration elements 32 and can be fixedly connected to any of the calibration elements 32. In one embodiment, the calibration assembly 3 further includes a base plate 30. When the magnetic base 2 is attached to the support device 93, the base plate 30 is substantially parallel to the ground. The rangefinder 31 and each calibration element 32 are fixedly mounted on the base plate 30.

[0069] See also Figure 3 and Figure 4 As shown, in one embodiment, the calibration component 3 also includes an adapter circuit board 33, which is arranged on the base plate 30 and connected to the rangefinder 31 and the second control module, for powering the rangefinder 31 and transmitting the signal of the rangefinder 31 to the first control module 51.

[0070] Specifically, if Figure 5 and Figure 6 As shown, in one embodiment, the calibration assembly 3 includes a plurality of calibration members 32, each of which includes a fixed plate 325 and a reflective plate 322. The lower end of each fixed plate 325 is connected to the base plate 30, and the upper end of the fixed plate 325 is connected to the reflective plate 322, so that the reflective plate 322 is maintained at a distance above the base plate 30 and faces the vehicle to be inspected 91. The surface of the reflective plate 322 facing the vehicle is a reflective plane 3220, and at least a portion of the reflective plane 3220 serves as a calibration point. The reflective plate 322 and the fixed plate 325 can be integrally formed or separately formed and fixedly connected, and the fixed connection method between the fixed plate 325 and the reflective plate 322 is not limited.

[0071] Alternatively, in one embodiment, the number of the calibration member 32 is one, which includes a fixing plate 325 and a reflecting plate 322. The reflecting plate 322 is provided with a plurality of stepped surfaces 3221 on a side thereof facing the vehicle 91 to be inspected. Figure 7 As shown, each step surface 3221 is a reflection plane 3220, and at least a portion of the reflection plane 3220 serves as a calibration point.

[0072] By providing a plurality of step surfaces 3221 , the distances between different step surfaces 3221 and the opposite range finder 31 are different.

[0073] Optionally, the step surfaces 3221 are arranged parallel to each other, and the step surfaces 3221 are perpendicular to the bottom plate 30 .

[0074] Next, see Figure 3 and Figure 4 As shown, in one embodiment, the first device 100 and the second device 200 each include two detection components 4, which are respectively arranged on the left and right sides of the calibration component 3, and are used to face a front wheel and a rear wheel respectively; Figure 8As shown, each detection component 4 includes a camera 43; the first device 100 is arranged between the front wheel and the rear wheel on the right side of the vehicle to be inspected 91, and the two cameras 43 of the first device 100 are respectively tilted toward the front wheel and the rear wheel on that side, so as to obtain image information of the auxiliary tools on the front wheel and the rear wheel on that side of the vehicle to be inspected 91; the second device 200 is arranged between the front wheel and the rear wheel on the left side of the vehicle to be inspected 91, and the two cameras 43 of the second device 200 are respectively tilted toward the front wheel and the rear wheel on that side, so as to obtain image information of the auxiliary tools on the front wheel and the rear wheel on that side of the vehicle to be inspected 91.

[0075] The control device is connected to each camera 43 to receive and process the image information. Since the four-wheel aligner determines the relative positional relationship between the first device 100 and the second device 200 distributed on both sides of the vehicle 91 to be inspected, and the first device 100 and the second device 200 on both sides capture the image information of the auxiliary tool fixed to the wheel 92 to be tested of the vehicle 91 to be inspected through the second camera 43, it is convenient to perform a four-wheel alignment test on the vehicle 91 to be inspected based on the image information of the auxiliary tool and the relative positional relationship between the first device 100 and the second device 200, and then obtain the four-wheel parameters of the vehicle 91 to be inspected.

[0076] See also Figure 8 As shown, in one embodiment, the detection component 4 also includes a first mounting plate 41, the lower end of the first mounting plate 41 is fixedly connected to the base plate 30 of the calibration component 3, and the camera 43 is arranged on the first mounting plate 41 so that the relative position between the camera 43 and the base plate 30 remains fixed.

[0077] In an optional embodiment, the detection assembly 4 further includes a fill light 44 for providing supplemental light to the camera 43 to improve the clarity and accuracy of the image detection of the wheel 92 to be detected. The fill light 44 is annular in shape and is configured to be positioned around the camera 43. The detection assembly 4 may include a second mounting plate 42, the lower end of which is fixedly connected to the first mounting plate 41 and / or the base plate 30. The upper end of the second mounting plate 42 is annular in shape, corresponding to the shape of the fill light 44, and the fill light 44 is mounted on the upper end of the second mounting plate 42.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A calibration system based on a rangefinder, characterized in that: The device comprises a first device and a second device for use in pair, wherein the first device and the second device are respectively arranged on a side of a vehicle to be inspected where a tire to be inspected is arranged; The first device includes a rangefinder, and the second device includes a calibration element: The rangefinder of the first device is used to obtain distance information between the rangefinder and the calibration piece of the second device located on the opposite side; The control device is connected to the rangefinder and is used to receive the distance information from the rangefinder and process the distance information.

2. The rangefinder-based calibration system according to claim 1, characterized in that: The second device further includes the rangefinder, and the first device further includes the calibration element. The rangefinder of the second device is used to obtain the distance information of the calibration element of the first device. The control device includes a first control module provided in the first device and a second control module provided in the second device. The first control module is connected to the rangefinder of the first device, and the second control module is connected to the rangefinder of the second device. Both the first control module and the second control module are communicatively connected to a control terminal, and the control terminal is used to receive the distance information from the first control module and the distance information from the second control module, and process the two distance information; or, both the first control module and the second control module are communicatively connected to a control terminal, and the first control module is used to receive the distance information obtained by the control device from the second control module, and process the two distance information; or, the first control module is used to receive the distance information from the second control module, and process the two distance information.

3. The rangefinder-based calibration system according to claim 1, wherein: There are multiple calibration pieces, and the projections of the multiple calibration pieces along the width direction of the vehicle to be inspected do not overlap; along the width direction of the vehicle to be inspected, the distances between at least two of the calibration pieces and the vehicle to be inspected are different; each calibration piece is provided with at least one calibration point.

4. The rangefinder-based calibration system according to claim 3, characterized in that: There are four calibration pieces, the first and third calibration pieces are spaced apart along the length direction of the vehicle to be inspected; the second calibration piece is located below the first calibration piece and on the side of the first calibration piece close to the vehicle to be inspected, and the fourth calibration piece is located above the first calibration piece and on the side of the first calibration piece away from the vehicle to be inspected.

5. The rangefinder-based calibration system according to claim 3, characterized in that: Each calibration piece includes a fixing plate and a reflecting plate connected to each other. The lower ends of the fixing plates are connected through a bottom plate. The surface of the reflecting plate facing the vehicle to be inspected is a reflecting plane, and at least a part of the reflecting plane serves as the calibration point.

6. The rangefinder-based calibration system according to claim 3, characterized in that: The rangefinder is located between the plurality of calibration elements. The rangefinder includes a plurality of distance measuring probes, and each of the distance measuring probes corresponds to one calibration point.

7. The rangefinder-based calibration system according to claim 1, wherein: The calibration component includes a fixing plate and a reflecting plate connected to each other; a plurality of step surfaces are formed on the side of the reflecting plate facing the vehicle to be inspected, each step surface is a reflecting plane, and at least a part of the reflecting plane serves as the calibration point.

8. The rangefinder-based calibration system according to any one of claims 1 to 6, characterized in that: The rangefinder includes at least one of a laser rangefinder, an ultrasonic rangefinder, and an infrared rangefinder.

9. The rangefinder-based calibration system according to any one of claims 1 to 6, characterized in that: The first device and the second device are both provided with a magnetic seat, and the first device and the second device are arranged on a carrying device carrying the vehicle to be inspected through the magnetic seat, and are respectively located on a side of the vehicle to be inspected where the wheel to be inspected is provided.

10. A four-wheel aligner, characterized in that: The calibration system based on a rangefinder comprises the calibration system according to any one of claims 1 to 9, wherein the first device and the second device each comprise two cameras; the two cameras of the first device are used to obtain image information of auxiliary tools on the front wheels and rear wheels on one side of the vehicle to be inspected, and the two cameras of the second device are used to obtain image information of auxiliary tools on the front wheels and rear wheels on the other side of the vehicle to be inspected; and the control device is connected to each of the cameras to receive and process the image information.

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