A method for designing and installing a rear license plate position

Abstract

The present application discloses a method for designing the position parameters of a rear license plate and a method for installing the same, relating to the field of automotive industry development technology. The method comprises the following steps: S1: creating a virtual baseline, placing the rear license plate based on the virtual baseline, and respectively constraining the Z-height between the lower edge of the rear license plate and the virtual baseline, the license plate inclination angle, and the license plate viewing angle; S2: determining the angle between the light plate and the license plate, and placing the rear license plate light; S3: determining its transverse center end face, and aligning the rear camera center line with the transverse center end face; S4: determining the field of view spacing; establishing a dimension chain constraint model, setting the vertical height from the lower edge of the rear camera to the baseline, and obtaining the correlation between the license plate inclination angle and the Z-height. The method for designing the position parameters and the method for installing the present application, while meeting regulatory requirements, can quickly design the position of the rear license plate by establishing a dimension chain constraint model, thereby resolving the technical problem of low passive verification efficiency in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of automobile industry development, and in particular to a method for designing position parameters of a rear license plate and a method for installing the same. Background Art

[0002] During the automotive design and manufacturing process, the rear license plate, along with the adjacent rear camera and license plate light, must be designed and installed within the limited space at the rear of the vehicle. Specifically, the original rear camera is located low and completely exposed. If the camera is obstructed, the license plate on the rear license plate will be blocked. However, if it is not obstructed, there is a high risk of the camera being blocked by flying mud and sand. Furthermore, when designing the position of the rear license plate, rear camera, and license plate light, relevant license plate regulations must be considered. First, the angle between any point on the license plate and the license plate light source must be no less than 8° (GB18408-2015). Second, the lower edge of the rear license plate must be unobstructed, and the upper edge must be unobstructed within 15°.

[0003] Traditional license plate design methods rely on passive verification, first determining the height and angle of the rear license plate, and then determining whether all dimensions meet the requirements. This design process requires repeated trial and error to find the optimal height within the compact rear vehicle space. Specifically, the highest possible license plate position is crucial, as it not only provides a good field of view but also minimizes the risk of mud and sand splashing and obstructing the license plate. This creates a chaotic and inefficient design process.

[0004] Those skilled in the art are in urgent need of designing a method for quickly designing the position of a rear license plate. Summary of the Invention

[0005] In response to the defects in the existing technology, the purpose of this application is to provide a position parameter design method and installation method for a rear license plate. On the premise of meeting regulatory requirements, by establishing a dimensional chain constraint model, the position of the rear license plate can be quickly designed to solve the technical problem of low passive verification efficiency in the existing technology.

[0006] To achieve the above objectives, the technical solution adopted is: a method for designing the position parameters of a rear license plate, comprising the steps of:

[0007] S1: Create a virtual baseline and place the rear license plate based on the virtual baseline, constraining the Z-height between the lower edge of the rear license plate and the virtual baseline, the license plate inclination angle, and the license plate viewing angle.

[0008] S2: Determine the angle between the center point of the rear license plate light boundary and the line connecting the lower edge of the rear license plate, and position the rear license plate light;

[0009] S3: Determine the transverse center end plane according to the position of the rear license plate light, and set the center line of the rear camera to coincide with the transverse center end plane;

[0010] S4: Determine the visual distance between the lower edge of the rear camera and the upper visible line of the rear license plate; establish a dimensional chain constraint model, set the vertical height from the lower edge of the rear camera to the horizontal plane where the reference line is located, and obtain the correlation between the inclination angle of the license plate and the Z-direction height.

[0011] Based on the above technical solution, step S1 further includes constraining the X-direction distance between the lower edge of the rear license plate and the virtual reference line. Step S2 further includes determining the X-direction position of the rear license plate light by the angle of the light plate. Step S3 further includes ensuring that the X-direction positions of the center lines of the rear license plate light and the rear camera are consistent.

[0012] Based on the above technical solution, the dimension chain constraint model includes models of a virtual baseline, a rear license plate, a rear license plate light and a rear camera, as well as various dimensions; each dimension includes multiple setting parameters and multiple design parameters; the dimension chain constraint model also includes relationship equations between multiple design parameters.

[0013] Based on the above technical solution, the various dimensions include the Z-direction height, the license plate inclination angle, the license plate viewing angle, the light plate angle, the field of view distance, and the Z-direction distance between the lower edge of the rear camera and the upper edge of the rear license plate;

[0014] The license plate viewing angle, light sign angle and viewing angle spacing are set parameters, and the Z-direction height, license plate inclination angle and Z-direction spacing are design parameters; when the license plate inclination angle changes, the Z-direction height and Z-direction spacing also change.

[0015] Based on the above technical solution, the license plate inclination angle ranges from -15° to +30°, the license plate viewing angle is required to be greater than or equal to 15°, and the light board angle is required to be greater than or equal to 8°.

[0016] Based on the above technical solution, the license plate viewing angle is set to 15°, the license plate height is 140mm, and the field of view spacing is set to 5mm; the vertical height from the lower edge of the rear camera to the horizontal plane where the reference line is located is set to 500mm;

[0017] The relationship equation includes:

[0018] n=cos15°(sin15°sinα×140+5);

[0019] h=500-cosα×140-cos15°(sin15°sinα×140+5);

[0020] Among them, α is the inclination angle of the license plate, h is the Z-height, and n is the Z-distance.

[0021] Based on the above technical solution, the dimension chain constraint model also includes a tailgate switch and an exterior trim panel. In step S3, the exterior trim panel end face is determined by the transverse center end face, and the tailgate switch, rear camera and rear license plate light are on the same Y-direction length center line.

[0022] This application also discloses an installation method based on the above-mentioned position parameter design method, comprising the following steps:

[0023] According to the dimensional chain constraint model, an installation diagram of multiple design parameters is established, from which the license plate inclination angle is selected and the corresponding remaining design parameters are obtained. The dimensional chain constraint model shows the installed rear license plate, rear license plate light and rear camera.

[0024] According to the dimensional chain constraint model, the actual installation work of the rear license plate, rear license plate light and rear camera is carried out.

[0025] Based on the above technical solution, the dimensional chain constraint model includes a virtual reference line, models of the rear license plate, rear license plate light and rear camera, and various dimensions; each dimension includes multiple setting parameters and multiple design parameters; the dimensional chain constraint model also includes a relationship equation between the multiple design parameters;

[0026] The dimensions include the Z-axis height, the license plate inclination angle, the license plate viewing angle, the light plate angle, the field of view distance, and the Z-axis distance between the lower edge of the rear camera and the upper edge of the rear license plate;

[0027] The license plate viewing angle, light sign angle and viewing angle spacing are set parameters, and the Z-direction height, license plate inclination angle and Z-direction spacing are design parameters; when the license plate inclination angle changes, the Z-direction height and Z-direction spacing also change.

[0028] Based on the above technical solution, the license plate viewing angle is set to 15°, the license plate height is 140mm, and the field of view spacing is set to 5mm; the vertical height from the lower edge of the rear camera to the horizontal plane where the reference line is located is set to 500mm;

[0029] The relationship equation includes:

[0030] n=cos15°(sin15°sinα×140+5);

[0031] h=500-cosα×140-cos15°(sin15°sinα×140+5);

[0032] Among them, α is the inclination angle of the license plate, h is the Z-height, and n is the Z-distance.

[0033] The beneficial effects of the technical solution provided by this application include:

[0034] 1. The position parameter design method of the rear license plate of the present application, step S1 establishes preliminary constraints to roughly limit the position of the rear license plate, step S2 can limit the position of the rear license plate light in the X direction relative to the rear license plate, step S3 obtains the position of the rear camera in the X direction from the position of the rear license plate light, and step S4 establishes a dimension chain constraint model containing the correlation between the unknown quantity license plate inclination angle and the Z direction height, and performs detailed limitations, especially forming a dimension chain closed loop in the Z direction, so that when the positioning design of the rear license plate is carried out, the positioning of the rear license plate 10 is determined after the license plate inclination angle is selected, and the corresponding adaptation state is completed, and the optimal solution, that is, the highest position state, can be obtained efficiently and conveniently; the position parameter design method of the rear license plate of the present application incorporates regulatory requirements into the design steps. Compared with the traditional passive verification method, the verification is pre-positioned, and there is no need for repeated trial and error. The position design of the license plate can be completed conveniently and efficiently, solving the technical problem of low efficiency of passive verification in the existing technology.

[0035] 2. The position parameter design method of this application ensures that the center lines of the rear license plate lamp and the rear camera are consistent in the X-direction. The design is ingenious and flexible in size conversion, starting from the X-direction of the lower edge of the rear license plate, the X-direction of the rear license plate lamp, and then to the X-direction of the rear camera. This ensures that the X-direction dimension not only meets regulatory requirements but also has a strong correlation. After the conversion, the relative relationship between the lower edge of the rear license plate and the rear camera in the X-direction can actually be obtained, which can be used in actual installation work and is of high value.

[0036] 3. The rear license plate position parameter design method of the present application and the relationship equations among multiple design parameters can clearly and intuitively reflect the optimal solution for the rear license plate position design, i.e., the highest position state, and can guide designers to complete the optimal position parameter design of the license plate in a compact rear vehicle space. The position parameter design method of the present application orderly sorts out all dimensions related to the rear license plate, and can clearly and sequentially perform dimension setting and calculation, solving the problem of the existing technology being disorderly and inefficient in trial and error when performing position parameter design.

[0037] 4. The position parameter design method of the present application orderly organizes all dimensions related to the rear license plate, and can be clearly organized. First, the rear license plate is preliminarily positioned, and then the rear license plate light is positioned by turning off the light, and then the rear camera is positioned with the rear license plate light, and then the relationship between the rear camera and the rear license plate is determined, forming a closed loop of rear license plate, rear license plate, rear license plate and then back to the rear license plate, so that the dimension chain constraint model has a Z-direction closed-loop dimension chain, which can ensure that no matter what the angle of the rear license plate is, or what the height of the rear license plate is, the rear license plate can reach the highest position in the most compact space. The rear license plate in the highest position has a good field of view and prevents mud and sand from splashing as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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 description of 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 any creative work.

[0039] Figure 1 Dimensional design drawing of the license plate location for this application;

[0040] Figure 2 This is a schematic diagram of the relationship between the license plate and license plate light for this application;

[0041] Figure 3 for Figure 2 The left view (used to show the light source emission point);

[0042] Figure 4 for Figure 2 The left view (used to show the angle of the light board);

[0043] Figure 5 This is a schematic diagram of the installation positions of the components in the Y direction of this application;

[0044] Figure 6 for Figure 1 A partial enlarged view of middle A;

[0045] Figure 7 A schematic diagram of a specific dimensional chain constraint model for this application;

[0046] Figure 8 for Figure 7 Corresponding graphs of α, h, and n;

[0047] Figure numerals: 1. Baseline; 2. Z-height; 3. X-distance; 4. License plate inclination; 5. License plate viewing angle; 6. Light plate angle; 7. Field of view distance; 8. Z-distance; 10. Rear license plate; 101. Upper visible line; 11. Rear license plate light; 12. Rear camera; 121. Center point of luminous boundary; 13. Exterior panel; 14. Tailgate switch. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0049] like Figures 1 to 8 As shown, the present application discloses an embodiment of a method for designing position parameters of a rear license plate, which mainly guides the parameter design of the rear license plate 10, and also provides the rear license plate light 11 and the rear camera 12, and can also guide the installation of the rear license plate light 11 and the rear camera 12.

[0050] The position parameter design method includes the following steps:

[0051] S1: Create a virtual reference line 1 and constrain the rear license plate 10 using the X-axis positioning dimension, the Z-axis positioning dimension, and the angle dimension.

[0052] like Figure 1 As shown, a virtual baseline 1 is created, with its length oriented along the Y direction. Rear license plate 10 is positioned along virtual baseline 1, with the license plate face parallel to virtual baseline 1. Rear license plate 10 is positioned and constrained using Z-height 2, license plate inclination 4, and license plate visibility angle 5.

[0053] Specifically, Z-height 2 is the distance between the lower edge of the rear license plate 10 and the plane containing virtual reference line 1. License plate inclination angle 4 is the angle between the numbered side of the rear license plate 10 and the vertical plane. License plate viewing angle 5 is the angle between the top surface of the rear license plate 10 and the horizontal plane. Specifically, license plate viewing angle 5 meets the requirement of being unobstructed within 15° of the upper edge. Step S1 establishes preliminary constraints to roughly define the position of the rear license plate.

[0054] S2: Create a relative relationship between the rear license plate 10 and the rear license plate light 11.

[0055] Specifically, if Figure 2 、 Figure 3 and Figure 4 As shown, determine the luminous boundary center point 121 of the rear license plate light 11 (see Figure 3) and the lower edge of the rear license plate 10. Specifically, the angle 6 must meet regulatory requirements, i.e., it must be no less than 8°. Step S2 determines the X-axis position of the rear license plate light 11 relative to the rear license plate 10.

[0056] S3: Create a Y-direction module group, which includes the rear license plate light 11 and the rear camera 12.

[0057] like Figure 5 Specifically, based on the position of the rear license plate light 11, the transverse center end plane is determined, and the center line of the rear camera 12 is positioned so that it coincides with the transverse center end plane. The rear license plate light 11 and the rear camera 12 are located on the same transverse center end plane. Step S3 determines the X-axis position of the rear camera 12 from the position of the rear license plate light 11.

[0058] S4: Determine known quantities and establish a dimensional chain constraint model. The unknown quantities in the dimensional chain constraint model are related to each other.

[0059] like Figure 6 As shown, the visual field distance 7 between the lower edge of the rear camera 12 and the upper visible line 101 of the rear license plate 10 is determined. A dimensional chain constraint model is established, using the horizontal plane from the lower edge of the rear camera 12 to the reference line 1 as a known condition. The maximum Z-height 2 of the rear license plate 10 at any license plate inclination angle 4 is obtained. Step S4 establishes a dimensional chain constraint model that includes the correlation between the unknown quantity, license plate inclination angle 4, and Z-height 2. This allows for efficient and convenient determination of the optimal solution, i.e., the highest position, during the positioning design of the rear license plate 10.

[0060] The position parameter design method of the rear license plate of the present application includes: step S1 establishing preliminary constraints to roughly define the position of the rear license plate; step S2 can define the position of the rear license plate light 11 relative to the rear license plate 10 in the X direction; step S3 obtains the position of the rear camera 12 in the X direction from the position of the rear license plate light 11; step S4 establishes a dimensional chain constraint model including the correlation between the unknown quantity license plate inclination angle 4 and the Z-direction height 2, and performs detailed definition, especially forming a dimensional chain closed loop in the Z direction, so that when designing the positioning of the rear license plate 10, the positioning of the rear license plate 10 is determined after the license plate inclination angle 4 is selected, and the corresponding adaptation state is completed, so that the optimal solution, that is, the highest position state, can be obtained efficiently and conveniently;

[0061] The position parameter design method of the rear license plate of the present application incorporates regulatory requirements into the design steps. Compared with the traditional passive verification method, the verification is pre-placed, and there is no need for repeated trial and error. The position design of the rear license plate can be completed conveniently and efficiently, solving the technical problem of low efficiency of passive verification in the existing technology.

[0062] In another embodiment, based on the above technical solution, further constraints are imposed on the X direction;

[0063] Step S1 also includes constraining the X-direction distance 3 between the lower edge of the rear license plate 10 and the vertical plane where the virtual reference line 1 is located. The X-direction distance 3 and the Z-direction height can completely constrain the lower edge of the rear license plate 10 .

[0064] Step S2 also includes determining the X-direction position of the rear license plate light 11 using the light plate angle 6. Specifically, the light plate angle 6 can determine the X-direction distance between the rear license plate light 11 and the vertical plane of the virtual reference line 1. Specifically, the model, size, and center point of the luminous boundary of the rear license plate light 11 are all known in advance.

[0065] Step S3 also includes ensuring that the center lines of the rear license plate light 11 and the rear camera 12 are aligned in the X direction, that is, in the Y-direction cross section.

[0066] In the two embodiments, the first embodiment focuses on the Y direction and forms a Y-direction dimension chain link. In the second embodiment, in addition to the Y-direction dimension chain link, it also includes an open-loop X-direction related dimension.

[0067] The position parameter design method of the present application ensures that the center lines of the rear license plate light 11 and the rear camera 12 are consistent in the X-direction. The design is ingenious and flexible in size conversion, sequentially from the X-direction of the lower edge of the rear license plate 10, the X-direction of the rear license plate light 11 to the X-direction of the rear camera 12, so that the X-direction dimension not only meets the regulatory requirements but also has a strong correlation. Moreover, after the conversion, in fact, the relative relationship between the lower edge of the rear license plate 10 and the rear camera 12 in the X-direction can be obtained, which can be used in actual installation work and is of high value.

[0068] In the two embodiments, further, the dimensional chain constraint model includes models of the virtual baseline 1, the rear license plate 10, the rear license plate light 11 and the rear camera 12, and the models of the rear license plate 10, the rear license plate light 11 and the rear camera 12 are all reproduced one-to-one according to the actual parts.

[0069] The dimensional chain constraint model also includes individual dimensions. Specifically, each dimension includes multiple setting parameters and multiple design parameters. Setting parameters are determined during design, while design parameters are calculated and set during design. The dimensional chain constraint model also includes equations for the relationships between the multiple design parameters.

[0070] The rear license plate position parameter design method of the present application and the relationship equation between multiple design parameters can clearly and intuitively reflect the optimal solution for the rear license plate position design, namely the highest position state, and can guide designers to design the optimal position parameters of the rear license plate after completing the rear end of a vehicle with compact space.

[0071] In the two embodiments, further, the various dimensions include the Z-direction height 2, the license plate inclination angle 4, the license plate viewing angle 5, the light sign angle 6, the field of view distance 7, and the Z-direction distance 8 between the lower edge of the rear camera 12 and the upper edge of the rear license plate 10.

[0072] Among them, the license plate viewing angle 5, the light sign angle 6 and the field of view distance 7 are set parameters, which are set by designers based on experience and in compliance with regulations.

[0073] The Z-height 2, license plate inclination 4, and Z-distance 8 are design parameters that require computational design. Specifically, these three design parameters form a relational equation, which is incorporated into the dimensional chain constraint model. When the license plate inclination 4 changes, both the Z-height 2 and Z-distance 8 also change.

[0074] The position parameter design method of the present application organizes all dimensions related to the rear license plate in an orderly manner, and can perform dimension setting and calculation in a clear and orderly manner, thereby solving the problem of the existing technology in which position parameter design is disorderly and the efficiency of repeated trial and error is low.

[0075] In the two embodiments, further, the license plate inclination angle 4 ranges from -15° to +30°, the license plate viewing angle 5 is required to be greater than or equal to 15°, and the light plate angle 6 is required to be greater than or equal to 8°.

[0076] In both embodiments, in a specific example, the license plate viewing angle 5 is set to 15°, the license plate 10 height is 140 mm, and the field of view distance 7 is set to 5 mm. The vertical height from the lower edge of the rear camera 12 to the horizontal plane of the reference line 1 is set to 500 mm. In actual design, other dimensions and angles that comply with regulations may also be used.

[0077] Specifically, the light sign included angle 6 is 8 degrees, which just meets the regulatory requirements.

[0078] Specifically, the relationship equation includes:

[0079] n=cos15°(sin15°sinα×140+5);

[0080] h=500-cosα×140-cos15°(sin15°sinα×140+5);

[0081] Among them, α is the inclination angle of the license plate 4, h is the Z-direction height 2, and n is the Z-direction spacing 8. By selecting different α, the corresponding h and n can be obtained. That is, in the dimensional chain constraint model, by inputting different α, the position of the rear license plate 10 will directly change accordingly, and the corresponding h and n will be directly obtained.

[0082] Furthermore, the formula h = 500 - cos α × 140 - cos 15° (sin 15° sin α × 140 + 5) is derived from the formula n = cos 15° (sin 15° sin α × 140 + 5) and the formula cos α = 500 - hn / 140.

[0083] The position parameter design method of the present application organizes all dimensions related to the rear license plate in an orderly manner and can be clearly organized. First, the rear license plate 10 is preliminarily positioned, and then the rear license plate light 11 is positioned by turning off the light. Then, the rear camera 12 is positioned with the rear license plate light 11, and then the relationship between the rear camera 12 and the rear license plate 10 is determined, forming a closed loop of rear license plate 10, rear license plate 10, rear license plate 10, and then returning to rear license plate 10, so that the dimensional chain constraint model has a Z-direction closed-loop dimensional chain, which can ensure that no matter what the angle of the rear license plate 10 is, or what the height of the rear license plate 10 is, the rear license plate 10 can reach the highest position in the most compact space. The rear license plate 10 in the highest position has a good field of view and prevents mud and sand from splashing as much as possible.

[0084] Preferably, the dimensional chain constraint model also includes a tailgate switch 14 and an exterior trim panel 13. In step S3, the end face of the exterior trim panel 13 is determined by the transverse center end face, and the tailgate switch 14, the rear camera 12 and the rear license plate light 11 are on the same Y-direction length center line.

[0085] This application also discloses an installation method based on the above-mentioned position parameter design method, comprising the following steps:

[0086] According to the dimensional chain constraint model, multiple installation diagrams of design parameters are established, from which the license plate inclination angle 4 is selected and the corresponding remaining design parameters are obtained. The dimensional chain constraint model shows the installed rear license plate 10, rear license plate light 11 and rear camera 12;

[0087] According to the dimensional chain constraint model, the actual installation work of the rear license plate 10, the rear license plate light 11 and the rear camera 12 is carried out.

[0088] Regarding the installation method of the position parameter design method, in the two embodiments, further, the dimension chain constraint model includes models of the virtual baseline 1, the rear license plate 10, the rear license plate light 11 and the rear camera 12, and the models of the rear license plate 10, the rear license plate light 11 and the rear camera 12 are all reproduced one-to-one according to the actual parts.

[0089] The dimensional chain constraint model also includes individual dimensions. Specifically, each dimension includes multiple setting parameters and multiple design parameters. Setting parameters are determined during design, while design parameters are calculated and set during design. The dimensional chain constraint model also includes equations for the relationships between the multiple design parameters.

[0090] Regarding the installation method for the position parameter design method, in both embodiments, the dimensions further include the Z-axis height 2, the license plate inclination angle 4, the license plate viewing angle 5, the light plate angle 6, the field of view distance 7, and the Z-axis distance 8 between the lower edge of the rear camera 12 and the upper edge of the rear license plate 10. The license plate viewing angle 5, the light plate angle 6, and the field of view distance 7 are set parameters, which are set by the designer based on experience and in compliance with regulations.

[0091] The Z-height 2, license plate inclination 4, and Z-distance 8 are design parameters that require computational design. Specifically, these three design parameters form a relational equation, which is incorporated into the dimensional chain constraint model. When the license plate inclination 4 changes, both the Z-height 2 and Z-distance 8 also change.

[0092] The installation method of the position parameter design method of the present application organizes all dimensions related to the rear license plate in an orderly manner, and can perform dimension setting and calculation in a clear and orderly manner, solving the problem of the existing technology being chaotic and inefficient in trial and error when performing position parameter design.

[0093] In both embodiments, in a specific example, the license plate viewing angle 5 is set to 15°, the license plate 10 height is 140 mm, and the field of view distance 7 is set to 5 mm. The vertical height from the lower edge of the rear camera 12 to the horizontal plane of the reference line 1 is set to 500 mm. In actual design, other dimensions and angles that comply with regulations may also be used.

[0094] Specifically, the light sign included angle 6 is 8 degrees, which just meets the regulatory requirements.

[0095] Specifically, the relationship equation includes:

[0096] n=cos15°(sin15°sinα×140+5);

[0097] h=500-cosα×140-cos15°(sin15°sinα×140+5);

[0098] Among them, α is the inclination angle of the license plate 4, h is the Z-direction height 2, and n is the Z-direction spacing 8. By selecting different α, the corresponding h and n can be obtained. That is, in the dimensional chain constraint model, by inputting different α, the position of the rear license plate 10 will directly change accordingly, and the corresponding h and n will be directly obtained.

[0099] The position parameter design method and installation method of the present application orderly sort out all the dimensions related to the rear license plate, and can be clearly organized. First, the rear license plate 10 is preliminarily positioned, and then the rear license plate light 11 is positioned by turning off the light, and then the rear camera 12 is positioned with the rear license plate light 11, and then the relationship between the rear camera 12 and the rear license plate 10 is determined, forming a closed loop of rear license plate 10, rear license plate 10, rear license plate 10 and then returning to rear license plate 10 in sequence, so that the dimensional chain constraint model has a Z-direction closed-loop dimensional chain, which can ensure that no matter what the angle of the rear license plate 10 is, or what the height of the rear license plate 10 is, the rear license plate 10 can reach the highest position in the most compact space. The rear license plate 10 in the highest position has a good field of view and prevents mud and sand from splashing as much as possible.

[0100] Preferably, the dimensional chain constraint model also includes a tailgate switch 14 and an exterior trim panel 13. In step S3, the end face of the exterior trim panel 13 is determined by the transverse center end face, and the tailgate switch 14, the rear camera 12 and the rear license plate light 11 are on the same Y-direction length center line.

[0101] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application 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 this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0102] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0103] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand and implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A method for designing position parameters of a rear license plate, characterized in that: Including steps: S1: Create a virtual reference line (1), place the rear license plate (10) based on the virtual reference line (1), and constrain the Z-height (2) of the lower edge of the rear license plate (10) and the virtual reference line (1), the license plate inclination angle (4), and the license plate viewing angle (5); S2: Determine the angle (6) between the center point of the luminous boundary of the rear license plate light (11) and the line connecting the lower edge of the rear license plate (10), and install the rear license plate light (11); S3: according to the position of the rear license plate light (11), determine its transverse center end face, and set the center line of the rear camera (12) to coincide with the transverse center end face; S4: Determine the visual field distance (7) between the lower edge of the rear camera (12) and the upper visible line (101) of the rear license plate (10); establish a dimension chain constraint model, set the vertical height from the lower edge of the rear camera (12) to the horizontal plane where the reference line (1) is located, and obtain the correlation between the license plate inclination angle (4) and the Z-direction height (2); The dimension chain constraint model includes models of a virtual reference line (1), a rear license plate (10), a rear license plate light (11) and a rear camera (12), as well as various dimensions; each dimension includes a plurality of setting parameters and a plurality of design parameters; the dimension chain constraint model also includes a relationship equation between the plurality of design parameters; The dimensions include the Z-direction height (2), the license plate inclination angle (4), the license plate viewing angle (5), the light plate angle (6), the field of view distance (7), and the Z-direction distance (8) between the lower edge of the rear camera (12) and the upper edge of the rear license plate (10); The license plate viewing angle (5), the light plate angle (6) and the visual field spacing (7) are set parameters, and the Z-direction height (2), the license plate inclination angle (4) and the Z-direction spacing (8) are design parameters; when the license plate inclination angle (4) changes, the Z-direction height (2) and the Z-direction spacing (8) also change.

2. The method for designing position parameters of a rear license plate according to claim 1, wherein: Step S1 also includes constraining the X-direction spacing (3) between the lower edge of the rear license plate (10) and the virtual reference line (1); step S2 also includes determining the X-direction position of the rear license plate light (11) by the light plate angle (6); and step S3 also includes ensuring that the center lines of the rear license plate light (11) and the rear camera (12) are consistent in the X-direction position.

3. The method for designing position parameters of a rear license plate according to claim 1, wherein: The license plate inclination angle (4) ranges from -15° to +30°, the license plate viewing angle (5) is required to be greater than or equal to 15°, and the light plate angle (6) is required to be greater than or equal to 8°.

4. The method for designing position parameters of a rear license plate according to claim 1, wherein: The license plate viewing angle (5) is set to 15°, the license plate (10) has a height of 140 mm, and the field of view spacing (7) is set to 5 mm; the vertical height from the lower edge of the rear camera (12) to the horizontal plane where the reference line (1) is located is set to 500 mm; The relationship equation includes: n=cos15°(sin15°sinα×140+5); h=500-cosα×140-cos15°(sin15°sinα×140+5); Where α is the license plate inclination angle (4), h is the Z-axis height (2), and n is the Z-axis spacing (8).

5. The method for designing position parameters of a rear license plate according to claim 1, wherein: The dimension chain constraint model further includes a back door switch (14) and an exterior trim panel (13). In step S3, the end face of the exterior trim panel (13) is determined by the transverse center end face, and the back door switch (14), the rear camera (12) and the rear license plate light (11) are on the same Y-direction length center line.

6. An installation method based on the position parameter design method according to claim 1, characterized in that: The following steps are involved: According to the dimensional chain constraint model, a plurality of installation diagrams of design parameters are established, from which the license plate inclination angle (4) is selected, and the corresponding remaining design parameters are obtained. The dimensional chain constraint model shows the installed rear license plate (10), rear license plate light (11) and rear camera (12); According to the dimensional chain constraint model, the actual installation work of the rear license plate (10), the rear license plate light (11) and the rear camera (12) is carried out.

7. The method for installing the position parameter design method according to claim 6, characterized in that: The dimension chain constraint model includes models of a virtual reference line (1), a rear license plate (10), a rear license plate light (11) and a rear camera (12), as well as various dimensions; each dimension includes a plurality of setting parameters and a plurality of design parameters; the dimension chain constraint model also includes a relationship equation between the plurality of design parameters; The dimensions include the Z-direction height (2), the license plate inclination angle (4), the license plate viewing angle (5), the light plate angle (6), the field of view distance (7), and the Z-direction distance (8) between the lower edge of the rear camera (12) and the upper edge of the rear license plate (10); The license plate viewing angle (5), the light plate angle (6) and the visual field spacing (7) are set parameters, and the Z-direction height (2), the license plate inclination angle (4) and the Z-direction spacing (8) are design parameters; when the license plate inclination angle (4) changes, the Z-direction height (2) and the Z-direction spacing (8) also change.

8. The method for installing the position parameter design method according to claim 7, wherein: The license plate viewing angle (5) is set to 15°, the license plate (10) has a height of 140 mm, and the field of view spacing (7) is set to 5 mm; the vertical height from the lower edge of the rear camera (12) to the horizontal plane where the reference line (1) is located is set to 500 mm; The relationship equation includes: n=cos15°(sin15°sinα×140+5); h=500-cosα×140-cos15°(sin15°sinα×140+5); Where α is the license plate inclination angle (4), h is the Z-axis height (2), and n is the Z-axis spacing (8).

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