A device and method for determining the visible area of ​​a vehicle windshield

Abstract

The present invention relates to the field of vehicle production technology, and in particular to a measuring device for the visible area of ​​a car windshield and a determination method thereof, comprising a lifting support mechanism; a translation mechanism; a rotation mechanism; a V-point mechanism; a controller; in addition, a determination method is provided, comprising determining a vehicle three-dimensional coordinate system, a seat back angle, an R point, a V point, and an H point; fixing the above-mentioned measuring device based on the R point; starting the measuring device, and the V1 point emitting unit and the V2 point emitting unit determine the key visible areas A and B of the windshield. The present invention restores the standard measurement method, thereby achieving a stable measurement result; in addition, it is applicable to other vehicle test contents using the V point, including the S area, the reference point, the light-transmitting area, etc., and has a wider range of use; finally, the degree of automatic control of the device is improved, and it is convenient and quick to use.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle production, and in particular to a device for determining a visible area of ​​a car windshield and a method for determining the same. Background Art

[0002] The V point is based on the definition in GB11562-2014, simulating the driver's eyes to determine the critical visual area of ​​the front windshield. Currently, there are many tests involving the confirmation of the critical visual area of ​​the front windshield in the national standard mandatory test items, such as defrosting and defogger, front vision, wipers and washers, etc. Many of the test results contain the percentage of the critical visual area of ​​the windshield, which confirms the visual area.

[0003] Most domestic methods for confirming the critical visible area of ​​the windshield are to collect or quote the vehicle digital model, determine the critical visible area of ​​the windshield in the vehicle digital model, and then print it on paper at a 1:1 ratio. The paper is then pasted on the glass surface and the corresponding visible area is drawn. The process takes 1 to 2 hours depending on the accuracy, which is time-consuming and inconvenient. It also skips the step of confirming the visible area through the V point, which is very different from the method shown in the standard that "the four planes formed by the extension of the two V points are projected on the front windshield to form the circled area, which is the critical visible area." Summary of the invention

[0004] The purpose of the present invention is to provide a measuring device and a method for determining the visible area of ​​a car windshield, which are helpful to realize the standard test of the visible area of ​​a car windshield and improve the accuracy and reliability of the test.

[0005] In order to achieve the above object, the present invention provides a device for measuring the visible area of ​​a car windshield, comprising:

[0006] A lifting support mechanism for connecting with a three-dimensional H-point device;

[0007] A translation mechanism, which is installed at the output end of the lifting support mechanism, and the translation direction of the translation mechanism is perpendicular to the lifting direction of the lifting support mechanism;

[0008] A rotating mechanism, which is slidably connected to the translation mechanism, wherein a rotating shaft of the rotating mechanism is parallel to the lifting direction of the lifting support mechanism and perpendicular to the translation direction of the translation mechanism;

[0009] A V-point mechanism connected to the output end of the rotating mechanism, the V-point mechanism comprising a V-point driving unit, a V1-point emitting unit and a V2-point emitting unit, the V1-point emitting unit and the V2-point emitting unit can swing around the emitting point through the V-point driving unit;

[0010] The controller is electrically connected to the lifting support mechanism, the translation mechanism, the rotation mechanism and the V-point driving unit.

[0011] Optionally, the lifting support mechanism includes a lifting servo electric cylinder, and the translation mechanism is arranged at the output end of the lifting servo electric cylinder.

[0012] Optionally, the translation mechanism includes a first stepping guide rail and a second stepping guide rail arranged in parallel, the second stepping guide rail is connected to the first stepping guide rail, and the rotation mechanism is connected to the second stepping guide rail.

[0013] Optionally, the rotating mechanism includes a level detector and an angle motor for adjusting the lateral angle of the V-point mechanism, and the V-point mechanism is connected to the output end of the angle motor.

[0014] Optionally, the V-point driving unit includes a V1 motor for driving the V1 point launching unit to swing longitudinally around the launching point V1 and a V2 motor for driving the V2 point launching unit to swing longitudinally around the launching point V2, and the V1 motor and the V2 motor are respectively connected to the V1 point launching unit and the V2 point launching unit through an eccentric component.

[0015] Optionally, the V-point mechanism includes a mounting block, each of which is provided with a mounting channel for setting the V1 point launching unit and the V2 point launching unit, the V1 point launching unit and the V2 point launching unit are hinged in the mounting channel, and the inner side walls of the mounting channel are respectively provided with a plurality of card points arranged along the rotation direction of the V1 point launching unit and the V2 point launching unit, and the V1 point launching unit and the V2 point launching unit are provided with grooves for engaging with the card points.

[0016] A method for determining a visible area of ​​a car windshield comprises the following steps:

[0017] S1. Determine the vehicle's three-dimensional coordinate system, seat back angle, R point, V point, and H point;

[0018] S2, fix the above-mentioned measuring device based on point R, and the emission point V1 of the emission unit at point V1 and the emission point V2 of the emission unit at point V2 are on the same vertical line;

[0019] S3, starting the measuring device, and the V1 point emitting unit and the V2 point emitting unit determine the key visible areas A and B of the windshield;

[0020] Among them, the X-axis of the vehicle three-dimensional coordinate system is the vehicle length direction, the Y-axis is the vehicle width direction, and the Z-axis is the vehicle height direction.

[0021] Optionally, the step of determining area A includes:

[0022] A plumb plane A1 passes through points V1 and V2 and is on the left side of the X-axis and forms an angle of 13° with the X-axis;

[0023] A plane A2 passes through point V1, is 3° in elevation with the X-axis and is parallel to the Y-axis;

[0024] A plane A3 passes through point V2 and is parallel to the Y axis and has a depression angle of 1° with the X axis;

[0025] A plumb plane A4 passes through points V1 and V2 and is 20° to the right of the X-axis;

[0026] The area A is an area enclosed by the intersection lines of the planes A1, A2, A3, A4 and the windshield surface.

[0027] Optionally, the step of determining area B includes:

[0028] A plane B1 passes through point V1 and is parallel to the Y axis and has an elevation angle of 7° with the X axis;

[0029] Plane B2 passes through point V2 and is parallel to the Y axis and has a depression angle of 5° with the X axis;

[0030] A plumb plane B3 passes through points V1 and V2 and is on the left side of the X-axis and is 17° to the X-axis;

[0031] Plane B4, which is symmetrical to plane B3 and takes the longitudinal center plane of the vehicle as a reference plane;

[0032] The area enclosed by the planes B1 , B2 , B3 , and B4 on the windshield surface is area B.

[0033] Optionally, the following steps are also included:

[0034] Set up an articulated arm three-dimensional measuring machine to build a three-dimensional model of the current vehicle and the points V1 and V2 in the measuring device;

[0035] Setting a key visible area of ​​the windshield of the current vehicle in the three-dimensional model to form a preset visible area;

[0036] Execute the above steps to obtain the actual visible area of ​​the current vehicle windshield;

[0037] The actual visible area is compared with the preset visible area to obtain a coordinate deviation between the preset visible area and the actual visible area.

[0038] The implementation of the embodiments of the present invention has the following technical effects:

[0039] The present invention realizes the position adjustment of the emission points of the V1 point emission unit and the V2 point emission unit by setting a lifting support mechanism, a translation mechanism and a rotation mechanism, so as to facilitate adjusting the emission points of the V1 point emission unit and the V2 emission unit to the measurement position of the vehicle visible area measurement standard (i.e. GB-11562), and through the V1 point emission unit and the V2 emission unit that can swing longitudinally around the emission point, the projection points at different positions required in the vehicle visible area measurement process are projected onto the vehicle windshield to determine the key visible area of ​​the windshield, and the standard measurement method is restored, thereby achieving a stable measurement result; in addition, it is applicable to other vehicle test contents using V points including S area, reference point, light transmission area, etc., and has a wider range of use; finally, a controller is set to control the lifting support mechanism, the translation mechanism, the rotation mechanism and the V point drive unit, so as to improve the degree of automatic control of the device, and the use is convenient and quick, and the adjustment is relatively more accurate, thereby improving the reliability of the measurement;

[0040] Based on the above-mentioned measuring device, the measuring process reduces the switching of equipment and the complicated calculation process, and more intuitively restores the standard measurement method and obtains the corresponding windshield key visible area on the actual vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0042] Figure 2 yes Figure 1 A partial enlarged view of the

[0043] Figure 3 It is a flowchart of the steps of a preferred embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 1. Lifting support mechanism, 11. Lifting servo electric cylinder, 2. Translation mechanism, 21. First stepping guide rail, 22. Second stepping guide rail, 3. Rotation mechanism, 31. Level detector, 32. Deflection motor, 4. V-point mechanism, 41. V1 point launching unit, 42. V2 point launching unit, 43. V1 motor, 44. V2 motor, 45. Eccentric assembly, 46. Mounting block, 47. Mounting channel, 48. Card point, 5. Controller. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] refer to Figure 1 and Figure 2 One embodiment of the present invention provides a measuring device, comprising:

[0048] A lifting support mechanism 1, used for connecting with the three-dimensional H-point device;

[0049] A translation mechanism 2, which is installed at the output end of the lifting support mechanism 1, and the translation direction of the translation mechanism 2 is perpendicular to the lifting direction of the lifting support mechanism 1;

[0050] A rotating mechanism 3 is slidably connected to the translation mechanism 2, and a rotating axis of the rotating mechanism 3 is parallel to the lifting direction of the lifting support mechanism 1 and perpendicular to the translation direction of the translation mechanism 2;

[0051] A V-point mechanism 4, which is connected to the output end of the rotating mechanism 3, and the V-point mechanism 4 includes a V-point driving unit, a V1-point emitting unit 41 and a V2-point emitting unit 42. The V1-point emitting unit 41 and the V2-point emitting unit can swing around the emitting point through the V-point driving unit;

[0052] The controller 5, the lifting support mechanism 1, the translation mechanism 2, the rotation mechanism 3 and the V-point driving unit are all electrically connected to the controller.

[0053] The present invention realizes the position adjustment of the emission points of the V1 point emission unit 41 and the V2 point emission unit by setting the lifting support mechanism 1, the translation mechanism 2 and the rotation mechanism 3, so as to facilitate the adjustment of the emission points of the V1 point emission unit 41 and the V2 point emission unit 42 to the measurement position of the vehicle visible area measurement standard (i.e., GB-11562), and through the V1 point emission unit 41 and the V2 emission unit that can swing longitudinally around the emission point, the projection points at different positions required in the vehicle visible area measurement process are projected onto the vehicle windshield to determine the key visible area of ​​the windshield, and the standard measurement method is restored, thereby achieving stable measurement results; in addition, it is suitable for other vehicle test contents using the V point including the S area, the reference point, the light-transmitting area, etc., and has a wider range of use; finally, a controller is set to control the lifting support mechanism 1, the translation mechanism 2, the rotation mechanism 3 and the V point drive unit, so as to improve the degree of automatic control of the device, make it convenient and quick to use, and relatively think that the adjustment is more accurate, thereby improving the reliability of the measurement.

[0054] Furthermore, the lifting support mechanism includes a lifting servo electric cylinder 11, and the translation mechanism 2 is arranged at the output end of the lifting servo electric cylinder 11, so as to realize stepless adjustment of the V-point mechanism 4 in the longitudinal height, and the position adjustment is more precise and more stable.

[0055] The translation mechanism 2 of the present embodiment includes a first stepping guide rail 21 and a second stepping guide rail 22 arranged in parallel, the second stepping guide rail 22 is connected to the first stepping guide rail 21, and the rotating mechanism 3 is connected to the second stepping guide rail 22. On the one hand, the adjustment range is increased by connecting the first stepping guide rail 21 and the second stepping guide rail 22. On the other hand, the horizontal displacement accuracy is improved by the cooperation between the first stepping guide rail 21 and the second stepping guide rail 22.

[0056] The rotating mechanism 3 of this embodiment includes a horizontal detector 31 and a deflection motor 32 for adjusting the lateral deflection angle of the V-point mechanism 4. The V-point mechanism 4 is connected to the output end of the deflection motor 32 to achieve the adjustment of the lateral deflection angle of the V-point mechanism 4. Specifically, the plane in which the horizontal detector 31 is set in this embodiment is perpendicular to the line between the launch point V1 of the V1 point launch unit 41 and the launch point V2 of the V2 launch unit 42. Therefore, the horizontal detector 31 can be set to quickly detect whether the V1 point and the V2 point are on the vertical line.

[0057] Among them, the V-point driving unit includes a V1 motor 43 for driving the V1 point launching unit 41 to swing longitudinally around the launching point V1 and a V2 motor 44 for driving the V2 point launching unit 42 to swing longitudinally around the launching point V2. The V1 motor 43 and the V2 motor 44 are respectively connected to the V1 point launching unit 41 and the V2 point launching unit 42 through an eccentric component 45, so that when the V1 motor 43 and the V2 motor 44 rotate, the eccentric component 45 drives the V1 point launching unit 41 and the V2 point launching unit 42 to swing along the longitudinal direction.

[0058] Furthermore, the V-point mechanism 4 includes a mounting block 46, which is respectively provided with mounting channels 47 for setting the V1 point launching unit 41 and the V2 point launching unit 42. The V1 point launching unit 41 and the V2 point launching unit 42 are hinged in the mounting channel 47, and the inner side walls of the mounting channel 47 are respectively provided with a plurality of card points 48 arranged along the rotation direction of the V1 point launching unit 41 and the V2 point launching unit 42. The V1 point launching unit 41 and the V2 point launching unit 42 are provided with grooves for carding with the card points 48, so that after the V1 point launching unit 41 and the V2 point launching unit 42 are longitudinally swung to a preset position, the position is determined by carding with the grooves, thereby improving the stability of the V1 point launching unit 41 and the V2 point launching unit 42 during the projection point process.

[0059] refer to Figure 1-Figure 3 The embodiment of the present invention further provides a method for determining a critical visible area of ​​a vehicle windshield, comprising the following steps:

[0060] S1. Determine the three-dimensional coordinate system of the vehicle, the seat back angle, the R point, the V point and the H point. Specifically, refer to the setting of the three-dimensional coordinate system of the vehicle, the R point, the V point and the H point in standard GB-11562. Preferably, determine the three-dimensional coordinate system of the vehicle seat according to the setting of the three-dimensional coordinate system of the vehicle, the R point, the V point and the H point, and design the R point and the H point to coincide with the origin of the three-dimensional coordinate system of the seat;

[0061] S2, the above-mentioned measuring device is fixed based on point R, and the emitting point V1 of the point V1 emitting unit 41 and the emitting point V2 of the point V2 emitting unit 42 are on the same vertical line. Therefore, when the relative position of the measuring device and point R is fixed, during the adjustment of the car seat, the position of the measuring device is fixed and will not swing with the swing of the seat back, thereby keeping the positions of points V1 and V2 fixed, ensuring the accuracy of the measurement process;

[0062] Specifically, according to the measurement standard in GB-11562, the distance between point V1 and point V2 and the X-axis in the three-dimensional coordinate system of the seat is 5 mm, the distance between point V1 and point V2 and the Y-axis is 68 mm, and the distance between point V1 and point V2 and the XY plane in the three-dimensional coordinate system of the seat is 665 mm and 589 mm respectively.

[0063] S3, start the measuring device, and the V1 point emitting unit 41 and the V2 point emitting unit 42 determine the key visible areas A and B of the windshield;

[0064] The X-axis of the vehicle's three-dimensional coordinate system is the vehicle's length direction, the Y-axis is the vehicle's width direction, and the Z-axis is the vehicle's height direction.

[0065] Based on the above-mentioned measuring device, the measuring process reduces the switching of equipment and the complicated calculation process, and more intuitively restores the measurement method of the standard (i.e., the determination of the critical visible area of ​​the windshield in GB-11555) and obtains the corresponding critical visible area of ​​the windshield on the actual vehicle.

[0066] The step of determining area A includes:

[0067] A plumb plane A1 passes through points V1 and V2 and is on the left side of the X-axis and forms an angle of 13° with the X-axis;

[0068] A plane A2 passes through point V1, is 3° in elevation with the X-axis and is parallel to the Y-axis;

[0069] A plane A3 passes through point V2 and is parallel to the Y axis and has a depression angle of 1° with the X axis;

[0070] A plumb plane A4 passes through points V1 and V2 and is 20° to the right of the X-axis;

[0071] The area enclosed by the intersection lines of planes A1, A2, A3, A4 and the windshield surface is area A.

[0072] In addition, the step of determining area B in this embodiment includes:

[0073] A plane B1 passes through point V1 and is parallel to the Y axis and has an elevation angle of 7° with the X axis;

[0074] Plane B2 passes through point V2 and is parallel to the Y axis and has a depression angle of 5° with the X axis;

[0075] A plumb plane B3 passes through points V1 and V2 and is on the left side of the X-axis and is 17° to the X-axis;

[0076] Plane B4, which is symmetrical to plane B3 and takes the longitudinal center plane of the vehicle as a reference plane;

[0077] The area enclosed by planes B1, B2, B3, and B4 on the windshield surface is area B.

[0078] Furthermore, in order to determine the reliability of the measurement and the accuracy of the results of the measurement device, the following steps may be performed regularly:

[0079] Set up an articulated arm three-dimensional measuring machine to build a three-dimensional model of the current vehicle and the points V1 and V2 in the measuring device;

[0080] Setting a key visible area of ​​the windshield of the current vehicle in the three-dimensional model to form a preset visible area;

[0081] Execute steps S1-S3 to obtain the actual visible area of ​​the current vehicle windshield;

[0082] The actual visible area is compared with the preset visible area to obtain the coordinate deviation between the preset visible area and the actual visible area, so as to detect the accuracy of the windshield visible area formed by the deflected projection of the V1 point emitting unit and the V2 point emitting unit.

[0083] In summary, the present invention realizes the position adjustment of the emission points of the V1 point emission unit 41 and the V2 point emission unit 42 by setting the lifting support mechanism 1, the translation mechanism 2 and the rotation mechanism 3, so as to facilitate adjusting the emission points of the V1 point emission unit 41 and the V2 emission unit to the measurement position of the vehicle visible area measurement standard, and through the V1 point emission unit 41 and the V2 emission unit that can swing longitudinally around the emission point, the projection points at different positions required for the vehicle visible area measurement process are projected onto the vehicle windshield to determine the key visible area of ​​the windshield, and the standard measurement method is restored, thereby achieving stable measurement results; in addition, it is suitable for other vehicle test contents using V points including S area, reference point, light-transmitting area, etc., and has a wider range of use; finally, a controller is set to control the lifting support mechanism 1, the translation mechanism 2, the rotation mechanism 3 and the V point drive unit, so as to improve the degree of automatic control of the device, make it convenient and quick to use, and relatively think that the adjustment is more accurate, thereby improving the reliability of measurement; and based on the above-mentioned measuring device, the standard measurement method is more intuitively restored, thereby improving the measurement reliability of the visible area of ​​the vehicle windshield.

[0084] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the 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, and therefore cannot be understood as a limitation on the present invention.

[0085] In addition, the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A device for measuring the visible area of ​​a car windshield, characterized in that: include: A lifting support mechanism for connecting with a three-dimensional H-point device; A translation mechanism, which is installed at the output end of the lifting support mechanism, and the translation direction of the translation mechanism is perpendicular to the lifting direction of the lifting support mechanism; A rotating mechanism, which is slidably connected to the translation mechanism, wherein a rotating shaft of the rotating mechanism is parallel to the lifting direction of the lifting support mechanism and perpendicular to the translation direction of the translation mechanism; A V-point mechanism connected to the output end of the rotating mechanism, the V-point mechanism comprising a V-point driving unit, a V1-point emitting unit and a V2-point emitting unit, the V1-point emitting unit and the V2-point emitting unit can swing around the emitting point through the V-point driving unit; A controller, the lifting support mechanism, the translation mechanism, the rotation mechanism and the V-point driving unit are all electrically connected to the controller; The V-point driving unit includes a V1 motor for driving the V1-point emitting unit to swing longitudinally around the emitting point V1 and a V2 motor for driving the V2-point emitting unit to swing longitudinally around the emitting point V2, and the V1 motor and the V2 motor are respectively connected to the V1-point emitting unit and the V2-point emitting unit through an eccentric component; The V-point mechanism includes a mounting block, which is respectively provided with mounting channels for setting the V1-point launching unit and the V2-point launching unit. The V1-point launching unit and the V2-point launching unit are hinged in the mounting channels. The inner side walls of the mounting channels are respectively provided with a plurality of clamping points arranged along the rotation direction of the V1-point launching unit and the V2-point launching unit. The V1-point launching unit and the V2-point launching unit are provided with grooves for clamping with the clamping points.

2. The device for measuring the visible area of ​​a car windshield according to claim 1, characterized in that: The lifting support mechanism includes a lifting servo electric cylinder, and the translation mechanism is arranged at the output end of the lifting servo electric cylinder.

3. The device for measuring the visible area of ​​a car windshield according to claim 1, characterized in that: The translation mechanism comprises a first stepping guide rail and a second stepping guide rail which are arranged in parallel, the second stepping guide rail is connected to the first stepping guide rail, and the rotation mechanism is connected to the second stepping guide rail.

4. The device for measuring the visible area of ​​a car windshield according to claim 1, characterized in that: The rotating mechanism comprises a level detector and an angle motor for adjusting the lateral angle of the V-point mechanism, and the V-point mechanism is connected to the output end of the angle motor.

5. A method for determining the visible area of ​​a car windshield, characterized in that: The following steps are involved: S1. Determine the vehicle's three-dimensional coordinate system, seat back angle, R point, V point, and H point; S2. Fix the measuring device according to any one of claims 1 to 4 based on point R, and the emission point V1 of the emission unit at point V1 and the emission point V2 of the emission unit at point V2 are on the same vertical line; S3, starting the measuring device, and the V1 point emitting unit and the V2 point emitting unit determine the key visible areas A and B of the windshield; Among them, the X-axis of the vehicle three-dimensional coordinate system is the vehicle length direction, the Y-axis is the vehicle width direction, and the Z-axis is the vehicle height direction.

6. The method for determining the visible area of ​​a car windshield according to claim 5, characterized in that: The steps to determine area A include: A plumb plane A1 passes through points V1 and V2 and is on the left side of the X-axis and forms an angle of 13° with the X-axis; A plane A2 passes through point V1, is 3° in elevation with the X-axis and is parallel to the Y-axis; A plane A3 passes through point V2 and is parallel to the Y axis and has a depression angle of 1° with the X axis; A plumb plane A4 passes through points V1 and V2 and is 20° to the right of the X-axis; The area A is an area enclosed by the intersection lines of the planes A1, A2, A3, A4 and the windshield surface.

7. The method for determining the visible area of ​​a car windshield according to claim 5, characterized in that: The steps for determining region B include: A plane B1 passes through point V1 and is parallel to the Y axis and has an elevation angle of 7° with the X axis; Plane B2 passes through point V2 and is parallel to the Y axis and has a depression angle of 5° with the X axis; A plumb plane B3 passes through points V1 and V2 and is on the left side of the X-axis and is 17° to the X-axis; Plane B4, which is symmetrical to plane B3 and takes the longitudinal center plane of the vehicle as a reference plane; The area enclosed by the planes B1 , B2 , B3 , and B4 on the windshield surface is area B.

8. The method for determining the visible area of ​​a car windshield according to any one of claims 5 to 7, characterized in that: The following steps are also included: Set up an articulated arm three-dimensional measuring machine to build a three-dimensional model of the current vehicle and the points V1 and V2 in the measuring device; Establishing a key visible area of ​​the windshield of the current vehicle in the three-dimensional model to form a preset visible area; Execute steps S1-S3 to obtain the actual visible area of ​​the current vehicle windshield; The actual visible area is compared with the preset visible area to obtain a coordinate deviation between the preset visible area and the actual visible area.

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