Dimension design method for DTS of automobile tail lamp

Abstract

The invention relates to an automobile tail lamp DTS size design method, which comprises the following steps: firstly, obtaining a positioning strategy and a manufacturing tolerance of a target part, and obtaining a preliminary DTS tolerance in combination with tolerance analysis software; inputting the initial DTS tolerance into a whole vehicle appearance visual model to obtain a whole vehicle appearance DTS manufacturing state; in the above process, the whole vehicle appearance DTS manufacturing state, namely the visual effect of the vehicle appearance size, can be directly obtained, so that whether the whole vehicle appearance DTS manufacturing state meets the requirement or not is recognized in advance in the design stage, and the design efficiency is improved. The situation that in the real vehicle stage, appearance defects are recognized and rectified is avoided, DTS evaluation work is directly preposed, and the DTS evaluation work and a design link are synchronously carried out; by means of the mode, the DTS problem is recognized in advance, and the period and cost of industrial rectification are greatly reduced; and the product maturity is improved.

Description

Technical Field

[0001] This application relates to the technical field of vehicle dimension design, and particularly to a method for designing the DTS dimensions of the rear lights of an automobile. Background Art

[0002] Currently, as an important part of vehicle development, DTS (Dimension Technical Specification) design directly affects the visual perception quality of the interior and exterior appearance. Currently, the DTS design process for the interior and exterior trim of a vehicle usually establishes a preliminary DTS based on CAS information, renderings, competitor vehicle information, DTS enterprise standards, and DTS templates, and then conducts review and feedback. According to the feedback results, a positioning strategy is formulated, and the manufacturing tolerances of components are collected. Dimension chain calculations are performed, and the final DTS file is output.

[0003] However, in the above process, only the dimension chain check is used to determine whether the DTS meets the design expected goals, but its rationality cannot be visually evaluated, which leads to the identification and rectification of appearance defects during the actual vehicle stage, and the rectification cycle is relatively long. Summary of the Invention

[0004] An embodiment of this application provides a method for designing the DTS dimensions of the rear lights of an automobile to solve the problem in the related art that the traditional method for designing the appearance dimensions of the rear lights only uses the dimension chain check to determine whether the DTS meets the design expected goals, but its rationality cannot be visually evaluated, which leads to the identification and rectification of appearance defects during the actual vehicle stage, and the rectification cycle is relatively long.

[0005] In a first aspect, a method for designing the DTS dimensions of the rear lights of an automobile is provided, which includes:

[0006] Obtain the positioning strategy and manufacturing tolerances of the target components, and combine with tolerance analysis software to obtain the preliminary DTS tolerances; the target components include tail lights, rear through lights, and the rear door.

[0007] Input the preliminary DTS tolerances into the vehicle exterior visual model to obtain the manufacturing state of the vehicle exterior DTS.

[0008] Conduct a review and analysis of the manufacturing state of the vehicle exterior DTS to obtain an evaluation result.

[0009] In some embodiments, after obtaining the evaluation result, the following steps are further included:

[0010] Obtain the expected standards of the target components;

[0011] Judge whether the evaluation result meets the expected standards of the target components;

[0012] If it meets, use the positioning strategy and the preliminary DTS tolerances as the final solution;

[0013] If not satisfied, adjust the preliminary DTS tolerance, input the new preliminary DTS tolerance into the vehicle exterior visual model, obtain the vehicle exterior DTS manufacturing status again, and re-evaluate and analyze to obtain the evaluation result; then execute again the step of determining whether the evaluation result meets the expected standard of the target component.

[0014] In some embodiments, the positioning strategy and manufacturing tolerance of the target component are combined with tolerance analysis software to obtain the preliminary DTS tolerance, including the following steps:

[0015] Use dimension chain analysis software to model the taillights, rear through lights, and rear hatch of the target component respectively to obtain the corresponding model units;

[0016] Assemble the model units corresponding to the taillights, rear through lights, and rear hatch according to the positioning strategy, and then form an assembly analysis model;

[0017] Input the manufacturing tolerance into the assembly analysis model to obtain the preliminary DTS tolerance.

[0018] In some embodiments, the positioning strategy and manufacturing tolerance of the target component are combined with tolerance analysis software to obtain the preliminary DTS tolerance, including the following steps:

[0019] Use 3DCS dimension chain analysis software to model the taillights, rear through lights, and rear hatch of the target component respectively to obtain the corresponding model units;

[0020] Assemble the model units corresponding to the taillights, rear through lights, and rear hatch according to the positioning strategy, and then form an assembly analysis model;

[0021] Input the manufacturing tolerance into the assembly analysis model to obtain the basic DTS tolerance;

[0022] Select measurement points on the assembly analysis model, and then obtain the actual tolerance parameters of the measurement points;

[0023] Judge whether the actual tolerance parameters of the measurement points meet the corresponding design parameters;

[0024] If satisfied, use the basic DTS tolerance as the preliminary DTS tolerance;

[0025] If not satisfied, take the basic DTS tolerance as the adjustment starting parameter to adjust the assembly analysis model to obtain a new assembly analysis model; select measurement points on the new assembly analysis model, and then obtain the actual tolerance parameters of the measurement points; then execute again the step of judging whether the actual tolerance parameters of the measurement points meet the corresponding design parameters.

[0026] In some embodiments, the number of the measurement points includes multiple; the actual tolerance parameters include the single-point out-of-tolerance rate and the parallelism out-of-tolerance rate;

[0027] Obtain the actual tolerance parameters of the measurement points, including the following steps:

[0028] According to the actual tolerance value and target value of a measurement point, and the over-tolerance rate calculation formula, calculate the single-point over-tolerance rate corresponding to a measurement point; repeat this step to obtain the single-point over-tolerance rates of all measurement points;

[0029] According to the actual tolerance values of all measurement points and the parallel tolerance calculation formula, calculate the actual parallel tolerance; then according to the actual parallel tolerance, target parallel tolerance and over-tolerance rate calculation formula, calculate the parallel tolerance over-tolerance rate;

[0030] Take the parallel tolerance over-tolerance rate and multiple single-point over-tolerance rates as the actual tolerance parameters.

[0031] In some embodiments, obtaining the positioning strategy of the target component includes the following steps:

[0032] Obtain the positions and types of the positioning points on the taillight, rear through-light and rear hatch;

[0033] Obtain the product gap size and assembly sequence between the taillight, rear through-light and rear hatch;

[0034] Take the positions and types of the positioning points, as well as the product gap size and assembly sequence as the positioning strategy of the target component.

[0035] In some embodiments, the measurement points are located on the matching interfaces between the taillight and the rear through-light, between the taillight and the rear hatch, and between the rear through-light and the rear hatch.

[0036] In some embodiments, establishing a vehicle exterior visual model includes the following steps:

[0037] Obtain the vehicle exterior visual input data; the vehicle exterior visual input data includes the vehicle CAD model dimension data, the materials, colors and textures of the exterior, and the types of vehicle external environment scenes;

[0038] Use virtual simulation software and combine the vehicle exterior visual input data to form a vehicle exterior visual model.

[0039] In some embodiments, inputting the preliminary DTS tolerance into the vehicle exterior visual model to obtain the vehicle exterior DTS manufacturing status includes the following steps:

[0040] Input the preliminary DTS tolerance into the vehicle exterior visual model to obtain the initial vehicle exterior DTS manufacturing status;

[0041] Obtain the appearance visual evaluation standard parameter table;

[0042] According to different observation working conditions and in combination with the appearance visual evaluation standard parameter table, determine the eye point height and angle of the human body;

[0043] According to the observation working conditions and the corresponding eye point height and angle of the human body, adjust the vehicle's overall appearance visual model to obtain the corresponding overall vehicle appearance DTS manufacturing state.

[0044] In some embodiments, the observation working conditions include a close-range semi-squatting condition, a medium-range semi-squatting condition, a medium-range standing condition, and a close-range standing condition.

[0045] The beneficial effects brought by the technical solution provided in this application include: (only write the benefits of the independent claim)

[0046] The embodiment of the present application provides a method for designing the DTS size of the rear car lights. First, obtain the positioning strategy and manufacturing tolerance of the target component, and combine with the tolerance analysis software to obtain the preliminary DTS tolerance; then input the preliminary DTS tolerance into the vehicle's overall appearance visual model to obtain the overall vehicle appearance DTS manufacturing state; thus, conduct a review and analysis on the overall vehicle appearance DTS manufacturing state to obtain an evaluation result. In the above process, since the overall vehicle appearance DTS manufacturing state, that is, the visualization effect of the vehicle appearance size, can be directly obtained, it is possible to identify in advance whether the overall vehicle appearance DTS manufacturing state meets the requirements during the design stage, avoid identifying and rectifying appearance defects during the actual vehicle stage, directly advance the DTS evaluation work, and carry it out synchronously with the design link, avoiding the problem that the traditional DTS design cannot intuitively evaluate its rationality; through this method, DTS problems can be identified in advance, greatly reducing the cycle and cost of industrial rectification; and improving the product maturity. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0048] Figure 1 It is a schematic flowchart of the method for designing the DTS size of the rear car lights provided by the embodiment of the present application;

[0049] Figure 2 It is a schematic diagram of the tail light positioning strategy provided by the embodiment of the present application;

[0050] Figure 3 It is a schematic diagram of the rear through-light positioning strategy provided by the embodiment of the present application;

[0051] Figure 4 It is a schematic diagram of the back door tooling positioning strategy provided by the embodiment of the present application;

[0052] Figure 5 Schematic diagram of the back door assembly positioning strategy provided by the embodiment of the present application;

[0053] Figure 6 Schematic diagram of the distribution of measuring points G1, G2 and G3 on the matching interface of the taillight - rear through - light provided by the embodiment of the present application;

[0054] Figure 7 Schematic diagram of the calculation of the actual tolerance value of measuring point G1 provided by the embodiment of the present application;

[0055] Figure 8 Schematic diagram of the calculation of the actual tolerance value of measuring point G2 provided by the embodiment of the present application;

[0056] Figure 9 Schematic diagram of the calculation of the actual tolerance value of measuring point G3 provided by the embodiment of the present application;

[0057] Figure 10 Schematic diagram of the calculation of the actual parallelism difference of measuring points G1, G2 and G3 provided by the embodiment of the present application;

[0058] Figure 11 Schematic diagram of the DTS manufacturing state of the whole vehicle appearance shown under the close - range half - squat working condition provided by the embodiment of the present application. Detailed implementation manners

[0059] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0060] It should be understood for this application that:

[0061] Expected standard: It is formulated by first comparing with the data of competitive vehicles and the company's standard DTS, etc.

[0062] DTS (Dimension Technical Specifications) tolerance: It refers to the design requirements for the gaps and surface differences between various components of the interior and exterior of the whole vehicle. It is an important indicator of the manufacturing quality of the interior and exterior of the vehicle, and is an embodiment of the manufacturing level of the overall vehicle size quality, and is a subjective evaluation of the product quality by customers.

[0063] Currently, the DTS design process for the interior and exterior of the whole vehicle usually establishes the initial version of DTS based on CAS information, renderings, competitor vehicle information, DTS enterprise standards, and DTS templates, and then conducts review and feedback; formulates positioning strategies and collects component manufacturing tolerances according to the feedback results; performs dimension chain calculations and outputs the final DTS file.

[0064] However, in the above process, only the dimension chain calculation is used to determine whether the DTS meets the design expected goals, but its rationality cannot be intuitively evaluated, which leads to the identification and rectification of appearance defects during the actual vehicle stage, and the rectification cycle is relatively long.

[0065] The embodiment of the present application provides a method for designing the DTS dimensions of the rear vehicle lamp to solve the problem in the related art that the traditional method for designing the appearance dimensions of the rear vehicle lamp only determines whether the DTS meets the design expected goals through dimension chain calculation, but its rationality cannot be intuitively evaluated, which leads to the identification and rectification of appearance defects during the actual vehicle stage, and the rectification cycle is relatively long.

[0066] Please refer to Figure 1 , a method for designing the DTS dimensions of the rear vehicle lamp, which includes the following steps:

[0067] Step 100: Obtain the positioning strategy and manufacturing tolerance of the target component, and combine with tolerance analysis software to obtain the preliminary DTS tolerance; the target components include taillights, rear through lights, and rear doors;

[0068] Step 200: Input the preliminary DTS tolerance into the whole vehicle appearance visual model to obtain the manufacturing status of the whole vehicle appearance DTS;

[0069] Step 300: Conduct a review and analysis of the manufacturing status of the whole vehicle appearance DTS to obtain an evaluation result.

[0070] In the above process, since the manufacturing status of the whole vehicle appearance DTS can be directly obtained, that is, the visualization effect of the vehicle appearance dimensions, it is possible to identify in advance during the design stage whether the manufacturing status of the whole vehicle appearance DTS meets the requirements, avoid identifying and rectifying appearance defects during the actual vehicle stage, directly advance the DTS evaluation work, and carry it out synchronously with the design link, avoiding the problem that the traditional DTS design cannot intuitively evaluate its rationality; in this way, DTS problems can be identified in advance, greatly reducing the cycle and cost of industrial rectification; improving the product maturity; that is, it is possible to organize discussions and iterations among perception quality, styling, product departments, and quality departments. In this way, DTS problems can be identified in advance, greatly reducing the cycle and cost of industrial rectification; improving the product maturity.

[0071] In some preferred embodiments, after obtaining the evaluation result, the following steps are further included:

[0072] Step 400: includes:

[0073] Obtain the expected standards of the target component;

[0074] Judge whether the evaluation result meets the expected standards of the target component; that is, organize the perception of each specialty to score the visual gap surface difference, and whether it meets the expected standards of perception;

[0075] If it meets the requirements, take the positioning strategy and the preliminary DTS tolerance as the final solution;

[0076] If it does not meet the requirements, adjust the preliminary DTS tolerance, input the new preliminary DTS tolerance into the vehicle appearance visual model, obtain the vehicle appearance DTS manufacturing status again, and re-evaluate and analyze to obtain the evaluation result; then execute the step of judging whether the evaluation result meets the expected standards of the target component again.

[0077] Through this way, iterative optimization can be achieved, and only some steps need to be changed, reducing a large amount of calculations, so as to perform precise and effective iterative optimization.

[0078] In some preferred embodiments, in step 100, the positioning strategy and manufacturing tolerance of the target component are combined with tolerance analysis software to obtain the preliminary DTS tolerance, including the following steps:

[0079] Use dimensional chain analysis software to model the taillight, rear through lamp and rear door of the target component respectively to obtain the corresponding model units; the dimensional chain analysis software is 3DCS;

[0080] Assemble the model units corresponding to the taillight, rear through lamp and rear door according to the positioning strategy, and then form an assembly analysis model;

[0081] Input the manufacturing tolerance into the assembly analysis model to obtain the preliminary DTS tolerance.

[0082] This form directly outputs the vehicle appearance DTS manufacturing status, but there is a situation where the preliminary DTS tolerance does not meet the design requirements. Therefore, there is also the following optimization method:

[0083] In step 100, the positioning strategy and manufacturing tolerance of the target component are combined with tolerance analysis software to obtain the preliminary DTS tolerance, including the following steps:

[0084] Step 10001: Use 3DCS dimensional chain analysis software to model the taillight, rear through lamp and rear door of the target component respectively to obtain the corresponding model units;

[0085] Step 10002: Assemble the model units corresponding to the taillight, rear through lamp and rear door according to the positioning strategy, and then form an assembly analysis model;

[0086] Step 10003: Input manufacturing tolerances into the assembly analysis model to obtain the basic DTS tolerances. Among them, when performing tolerance simulation for steps 10001 - 10003, the following assumptions are based on: all parts are modeled and analyzed based on the rigid body assumption. All part tolerances are input based on the tolerances on the drawing, and the tolerance distribution forms adopt normal distribution and uniform distribution for die - formed parts and machined parts respectively. Welding deformation, painting deformation, and assembly deformation, etc. are not considered. Influences such as vibration and thermal deformation are not considered.

[0087] Step 10004: Select measurement points on the assembly analysis model, and then obtain the actual tolerance parameters of the measurement points; the number of measurement points includes multiple; the actual tolerance parameters include single - point out - of - tolerance rate and parallel - difference out - of - tolerance rate; obtaining the actual tolerance parameters of the measurement points includes the following steps:

[0088] According to the actual tolerance value and target value of a measurement point, and the out - of - tolerance rate calculation formula, calculate the single - point out - of - tolerance rate corresponding to a measurement point; repeat this step to obtain the single - point out - of - tolerance rates of all measurement points; the measurement points are located on the matching interfaces between the taillight and the rear through - light, the matching interface between the taillight and the rear hatch, and the matching interface between the rear through - light and the rear hatch.

[0089] According to the actual tolerance values of all measurement points and the parallel - difference calculation formula, calculate the actual parallel difference; then according to the actual parallel difference, target parallel difference, and out - of - tolerance rate calculation formula, calculate the parallel - difference out - of - tolerance rate;

[0090] Take the parallel - difference out - of - tolerance rate and multiple single - point out - of - tolerance rates as the actual tolerance parameters.

[0091] This step can be understood and explained with reference to Attachment Figure 6 , and Table 1 below.

[0092]

[0093] Table 1

[0094] Step 10005: Judge whether the actual tolerance parameters of the measurement points meet the corresponding design parameters;

[0095] Step 10006: If they meet, take the basic DTS tolerances as the preliminary DTS tolerances;

[0096] Step 10007: If they do not meet, take the basic DTS tolerances as the adjustment starting parameters to adjust the assembly analysis model to obtain a new assembly analysis model; select measurement points on the new assembly analysis model, and then obtain the actual tolerance parameters of the measurement points; then execute the step of judging whether the actual tolerance parameters of the measurement points meet the corresponding design parameters again, that is, Step 10005.

[0097] The above steps can be used for preliminary optimization and screening during tolerance simulation analysis to obtain the preliminary DTS tolerance that meets the design parameters, thereby reducing the number of iterative optimizations based on the evaluation results and shortening the design cycle.

[0098] In this embodiment, taking the clearance tolerance design as an example, three measurement points are taken on the DTS matching interface of the taillight - rear through - light. As shown in the appendix Figure 6 As shown, the tolerance calculation results of G1 - G3 are shown in Table 3, and the allowable non - conformity rate is 3%. Figures 7 - 9 They are the DTS calculation interface and the calculation results of points G1 / G2 / G3 respectively; Figure 10 They are the parallelism difference calculation results of points G1 / G2 / G3.

[0099] In some preferred embodiments, in step 100, obtaining the positioning strategy of the target component includes the following steps:

[0100] Obtaining the positions and types of the positioning points on the taillight, rear through - light, and rear hatch door;

[0101] Obtaining the product gap size and assembly sequence among the taillight, rear through - light, and rear hatch door;

[0102] Taking the positions and types of the positioning points, as well as the product gap size and assembly sequence as the positioning strategy of the target component.

[0103] The following gives a specific embodiment to illustrate the positioning strategy. The process flow is as follows: The rear hatch door with hinge assembly is assembled on the vehicle body through tooling on the welding and adjustment line, and then the taillight and rear through - light are respectively assembled on the general assembly line.

[0104] The taillight positioning strategy is as Figure 2 shown: The matching interface between the taillight and the through - light has high visual sensitivity and high attention. Therefore, the main positioning XIY6Z4 is preferably arranged at the matching position with the through - light; according to the principle that the positioning distance should be as large as possible, the secondary positioning X2Z5 is arranged diagonally. In order to facilitate assembly and reduce rotational error, the straight line segment of the oblong hole is kept in line with the center connection line of the main positioning hole; X3 / X7 are through - holes for tightening, and X8Y10Z9 are auxiliary positioning.

[0105] The rear through - light positioning strategy is as Figure 3 shown: XIZ4 and X2Z5 are ball - head pins, mainly for positioning in the Z - direction and tightening in the X - direction. Through ball - head pin positioning, it can prevent the rear through - light from dropping during the tightening process, and effectively avoid the problems of insufficient tightening space and poor operability; Y6 is a positioning pin fixed at the Y0 position, and the manufacturing tolerance of the rear through - light is distributed at both ends, which can effectively alleviate the problem of uneven left - right gaps; X7 - X15 are large through - holes, and are tightened by bolts to position in the X - direction.

[0106] The rear hatch door assembly positioning strategy is as Figure 4and Figure 5 As shown in Figure 5 , the back door hinge and the back door welding assembly are assembled through offline tooling. The back door tooling is first positioned on the vehicle body through two pins (X4Y6 / X5) and four surfaces (Z1 / Z2 / Z3 / Z7) (the positioning holes of the back door tooling are the basis for the transfer of the rear face dimensions and have high requirements for the body accuracy. In this case, the sheet metal where the positioning holes of the back door tooling are located is welded at the main body welding station of the vehicle body). The back door with hinge assembly is then positioned on the tooling through two process holes X4Y6 / X5. The upper side Z1Z2 is the tightening surface of the back door hinge, and the lower side Z3Z7 is positioned on the support surface of the back door tooling to prevent the back door from sinking.

[0107] In some preferred embodiments, in step 200, establishing a vehicle overall appearance visual model includes the following steps:

[0108] Obtaining vehicle overall appearance visual input data; the vehicle overall appearance visual input data includes the vehicle CAD model dimension data, the material, color and texture of the appearance, and the type of the vehicle external environment scene;

[0109] Using virtual simulation software and combining with the vehicle overall appearance visual input data to form a vehicle overall appearance visual model. The virtual simulation software is VRXPERIENCE.

[0110] In some preferred embodiments, in step 200, inputting the preliminary DTS tolerance into the vehicle overall appearance visual model to obtain the vehicle overall appearance DTS manufacturing state includes the following steps:

[0111] Inputting the preliminary DTS tolerance into the vehicle overall appearance visual model to obtain the initial vehicle overall appearance DTS manufacturing state;

[0112] Obtaining the appearance visual evaluation standard parameter table;

[0113] According to different observation working conditions and combining with the appearance visual evaluation standard parameter table, determining the eye point height and angle of the human body; the observation working conditions include the close - range half - squat working condition, the medium - range half - squat working condition, the medium - range standing working condition, and the close - range standing working condition;

[0114] According to the observation working conditions and the corresponding eye point height and angle of the human body, adjusting the vehicle overall appearance visual model to obtain the corresponding vehicle overall appearance DTS manufacturing state.

[0115] The above appearance visual evaluation standard parameter table is Table 2 below;

[0116]

[0117] Table 2

[0118] Among them, taking the close - range half - squat working condition as an example for detailed explanation, refer to Figure 11 .

[0119] Figure 11 For the close-range half-squat working condition, the worst-case scenario within the tolerance range is used for evaluation. a - c are the extreme working conditions with a larger upper part and a smaller lower part (upper side clearance 5.5, lower side 4.0); among them, a is -15° on the left side, b is the front, and c is 15° on the right side. d - f are the extreme working conditions with a smaller upper part and a larger lower part (upper side clearance 4.0, lower side 5.5), where d is -15° on the left side, e is the front, and f is 15° on the right side.

[0120] Through the above description, for the DTS dimension design method of the automobile rear lamp, it is proposed that in the design stage, the manufacturing status of the vehicle's DTS can be identified in advance through the VRXPERIENCE software, avoiding the need to identify and rectify appearance defects during the actual vehicle stage. The DTS evaluation work is directly pre-positioned and carried out synchronously with the design link. In this way, DTS problems can be identified in advance, greatly reducing the cycle and cost of industrial rectification; and improving the product maturity.

[0121] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present 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, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0122] It should be noted that in the present application, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0123] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A design method for the DTS size of the rear car lights, characterized in that, It includes: Obtain the positioning strategy and manufacturing tolerance of the target component, and combine with tolerance analysis software to obtain the preliminary DTS tolerance; The target components include taillights, rear through-lights, and rear hatchbacks; Input the preliminary DTS tolerance into the vehicle exterior visual model to obtain the vehicle exterior DTS manufacturing status; Conduct a review and analysis of the vehicle exterior DTS manufacturing status to obtain an evaluation result.

2. The DTS size design method of the rear car light as described in claim 1, characterized in that, After obtaining the evaluation result, the following steps are also included: Obtain the expected standard of the target component; Judge whether the evaluation result meets the expected standard of the target component; If it meets the standard, take the positioning strategy and the preliminary DTS tolerance as the final solution; If it does not meet the standard, adjust the preliminary DTS tolerance, input the new preliminary DTS tolerance into the vehicle exterior visual model, obtain the vehicle exterior DTS manufacturing status again, and conduct a re-review and analysis to obtain an evaluation result; then execute the step of judging whether the evaluation result meets the expected standard of the target component again.

3. The DTS dimension design method for the rear car lights as described in claim 1, characterized in that, The positioning strategy and manufacturing tolerance of the target component are combined with tolerance analysis software to obtain the preliminary DTS tolerance, including the following steps: Use dimensional chain analysis software to model the taillights, rear through-lights, and rear hatchbacks of the target component respectively to obtain the corresponding model units; Assemble the model units corresponding to the taillights, rear through-lights, and rear hatchbacks according to the positioning strategy, and then form an assembly analysis model; Input the manufacturing tolerance into the assembly analysis model to obtain the preliminary DTS tolerance.

4. The method for designing the DTS size of the rear car light according to claim 1, characterized in that, The positioning strategy and manufacturing tolerance of the target component are combined with tolerance analysis software to obtain the preliminary DTS tolerance, including the following steps: Use 3DCS dimensional chain analysis software to model the taillights, rear through-lights, and rear hatchbacks of the target component respectively to obtain the corresponding model units; Assemble the model units corresponding to the taillights, rear through-lights, and rear hatchbacks according to the positioning strategy, and then form an assembly analysis model; Input the manufacturing tolerance into the assembly analysis model to obtain the basic DTS tolerance; Select measurement points on the assembly analysis model, and then obtain the actual tolerance parameters of the measurement points; Judge whether the actual tolerance parameters of the measurement points meet the corresponding design parameters; If they meet the standard, take the basic DTS tolerance as the preliminary DTS tolerance; If they do not meet the standard, take the basic DTS tolerance as the starting parameter for adjustment to adjust the assembly analysis model to obtain a new assembly analysis model; select measurement points on the new assembly analysis model, and then obtain the actual tolerance parameters of the measurement points; then execute the step of judging whether the actual tolerance parameters of the measurement points meet the corresponding design parameters again.

5. The DTS dimension design method for automotive rear lights according to claim 4, characterized in that: The number of the measurement points includes multiple; the actual tolerance parameters include single-point out-of-tolerance rate and parallelism out-of-tolerance rate; Obtaining the actual tolerance parameters of the measurement points includes the following steps: According to the actual tolerance value and target value of a measurement point, and the out-of-tolerance rate calculation formula, calculate the single-point out-of-tolerance rate corresponding to a measurement point; repeat this step to obtain the single-point out-of-tolerance rates of all measurement points; According to the actual tolerance values of all measurement points and the parallelism calculation formula, calculate the actual parallelism; then according to the actual parallelism, target parallelism, and out-of-tolerance rate calculation formula, calculate the parallelism out-of-tolerance rate; Take the parallel difference out-of-tolerance rate and multiple single-point out-of-tolerance rates as the actual tolerance parameters.

6. The method for designing the DTS size of the rear car lights according to claim 3 or 4, characterized in that: Obtain the positioning strategy of the target component, including the following steps: Obtain the positions and types of the positioning points on the taillights, rear through lights, and rear hatch; Obtain the product gap size and assembly sequence between the taillights, rear through lights, and rear hatch; Take the positions and types of the positioning points, as well as the product gap size and assembly sequence, as the positioning strategy of the target component.

7. The method for designing the DTS size of the rear car lights according to claim 4, characterized in that: The measurement points are located on the matching interfaces between the taillights and the rear through lights, between the taillights and the rear hatch, and between the rear through lights and the rear hatch.

8. The DTS dimension design method of the rear car light according to claim 1, characterized in that Establish a vehicle exterior visual model, including the following steps: Obtain the vehicle exterior visual input data; the vehicle exterior visual input data includes the vehicle CAD model size data, the materials, colors, and textures of the exterior, and the type of the vehicle external environment scene; Use virtual simulation software and combine the vehicle exterior visual input data to form a vehicle exterior visual model.

9. The DTS size design method of the rear car lights as described in claim 1, characterized in that, Input the preliminary DTS tolerance into the vehicle exterior visual model to obtain the vehicle exterior DTS manufacturing state, including the following steps: Input the preliminary DTS tolerance into the vehicle exterior visual model to obtain the initial vehicle exterior DTS manufacturing state; Obtain the appearance visual evaluation standard parameter table; According to different observation conditions and in combination with the appearance visual evaluation standard parameter table, determine the eye point height and angle of the human body; According to the observation conditions and the corresponding eye point height and angle of the human body, adjust the vehicle exterior visual model to obtain the corresponding vehicle exterior DTS manufacturing state.

10. The method for designing the DTS size of the rear car lights according to claim 9, characterized in that: The observation conditions include the close-range semi-squat condition, the medium-range semi-squat condition, the medium-range upright condition, and the close-range upright condition.

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