Method for checking light leakage of sun visor

Abstract

The invention provides a method for checking light leakage of a sun shield, which is used for effectively adjusting and optimally avoiding the conditions of upper light leakage or left light leakage of the sun shield, the sun shield, a ceiling boundary, an A column boundary and a front windshield black edge in the driving process of a driver and passengers. By taking the left limit point or the upper limit point of the left eye ellipse as a projection center, projecting a point on the sun shield onto the curved surface of the front windshield, projecting a point on the left A column onto the curved surface of the front windshield, and projecting a point on the ceiling onto the curved surface of the front windshield; and then processing the data. According to the method, the optimized result can be quantitatively presented, a model or an organizing person is not needed for review, and high efficiency and low cost are achieved.

Description

Technical Field

[0001] This invention relates to the field of vehicle design, and in particular to a method for checking light leakage in sun visors. Background Technology

[0002] Cars have become an essential tool for people's daily travel. With the improvement of living standards and the increase in tourism activities, the frequency of vehicle use is increasing, and people are spending more and more time in the car and on the road. As a result, people's requirements for vehicle comfort are also getting higher and higher. To improve people's comfort needs, the perception of comfort experience is represented in a parametric form, and the best optimization direction is quickly identified from a large number of parameters. Saving time, saving money, and being efficient have become the primary issues.

[0003] like Figure 1 As shown, the sun visor 100 is an adjustable device inside the car used to block sunlight or strong light. It is usually installed above the windshield 200 (driver's / passenger's seat). It blocks strong sunlight by rotating downwards around the rotation axis 110, and achieves lateral sun shading by rotating laterally. Some sun visors can be pulled down or pulled along the axis to compensate for insufficient sun shading below and to the sides. Currently, the method to check for light leakage below is to flip the sun visor down to a vertical position, requiring its lowest boundary to be 10-20mm below the horizontal line of point V1, and within a 5° angle of elevation of point V. The method to check for light leakage to the sides is to control the gap between the sun visor at its initial position, the maximum outline of the sun visor, and the roof 300 to be within 5-10mm.

[0004] The current verification method has the following shortcomings: 1. It only verifies light leakage from below, without considering light leakage at the sun visor mounting point due to the sun visor's structure itself; 2. It only controls the gap between the sun visor 100 and the roof 300 on the side. When the sun visor is in use, the gap between the sun visor 100 and the A-pillar is not controlled, and there is still a risk of light leakage between the sun visor 100 and the A-pillar. Initially, evaluation and verification can only be carried out through models and actual vehicles. Verification also has two problems: the sun visor cannot be opened in most cases on the model, and the model can only be verified indoors, and cannot simulate natural light from various angles outdoors; the evaluation can only identify the direction of the problem, but it lacks data-driven persuasiveness in directly optimizing the risk boundary (i.e., which part to optimize and by how many millimeters to achieve the highest cost-effectiveness), and in which direction optimization is better and more effective, thus having certain limitations. Summary of the Invention

[0005] This invention aims to solve the problems of light leakage above the sun visor and light leakage between the sun visor and the A-pillar in the prior art; it provides a method for verifying light leakage of the sun visor. This method can quickly identify the optimization direction, which component to optimize, and how many millimeters to optimize for the best cost performance, and quickly quantify the optimization results, eliminating the time-consuming, labor-intensive, and costly work of model making and group review.

[0006] The technical solution adopted by this invention to achieve its technical objective is: a method for checking sun visor light leakage. This method addresses situations where light leakage occurs above or to the left of the sun visor during driving, and effectively adjusts and optimizes the sun visor, roof edge, A-pillar edge, and windshield black edge to avoid these issues. The method includes the following steps: Step 1: In the vehicle coordinate system, based on the 95% human body H point, accelerator pedal reference point, distance from the steering wheel center point to the accelerator pedal reference point in the X direction, distance from the R point to the heel point in the Z direction, and the Y coordinate value of the R point, calculate the 95% percentile eye ellipse according to the SAE standard; based on the calculated eye ellipse, make the left limit point and upper limit point of the left eye ellipse. Step 2: Rotate the sunshade body from its initial position around its axis of rotation to a vertical position and then rotate it forward by a set angle. Step 3: Using the left extreme point of the left eye ellipse as the projection center, project the points on the sun visor onto the curved surface of the windshield to form the first sun visor projection area, and project the points on the left A-pillar onto the curved surface of the windshield to form the left A-pillar projection area. Using the upper limit point of the left eye ellipse as the projection center, the points on the sun visor are projected onto the curved surface of the windshield to form the second sun visor projection area, and the points on the roof are projected onto the curved surface of the windshield to form the roof projection area. Step 4: On the curved surface of the windshield, take the union of the first sun visor projection area and the left A-pillar projection area to form a first union; take the union of the second sun visor shadow area and the roof projection area to form a second union; Step 5: On the first union, determine that the right side line of the left A-pillar projection area and the lace line on the curved surface of the windshield are close to the left boundary of the first sun visor projection area. Take the part of the right side line of the left A-pillar projection area and the lace line that is close to the left boundary of the first sun visor projection area to form the left side line. On the second union, it is determined that the lower edge of the ceiling projection area and the lace line are close to the upper boundary of the first sunshade projection area, and the upper edge is formed by taking the part of the lower edge of the ceiling projection area and the lace line that is close to the upper boundary of the second sunshade projection area. Step 6: Determine the left light leakage area, which reflects the light leakage on the left side, by the gap between the left boundary of the first sun visor projection area to the left and the left side line; and the upper light leakage area, which reflects the light leakage on the upper side, by the gap between the upper boundary of the second sun visor projection area to the upper side line.

[0007] Furthermore, in the above-mentioned sunshade light leakage verification method: in step 2, the sunshade is rotated around its rotation axis to a vertical position and forward by 10°.

[0008] Furthermore, in the above-mentioned method for checking light leakage from the sun visor, the judgment of light leakage on the left side includes the following steps: Step 101: Offset the straight line segment of the upper lace line once every first predetermined distance on the outer surface of the windshield, and extend the straight line to the left to the left side line; Step 102: Measure the distance from the left edge of the projection area of ​​the first sunshade at the corresponding position to the left side line, and use this distance as the left light leakage distance to reflect the left light leakage situation.

[0009] Furthermore, the above-mentioned method for checking light leakage from sunshades also includes: Step 103: If the light leakage distance on the left side is less than 5mm, it is considered to be risk-free.

[0010] Furthermore, the above-mentioned method for checking light leakage from sunshades also includes: Step 104: If the light leakage distance on the left side is greater than 5mm, compare it with the car models in the database. If the distance is close to that of excellent car models on the market, then it can be accepted with a concession.

[0011] Furthermore, in the above-mentioned method for checking light leakage from the sun visor, if light leakage on the left side is unacceptable, it also includes: Step 105: Optimization steps; the optimization direction includes widening the windshield trim to the right or widening the left A-pillar, and after widening the left A-pillar, moving the windshield trim to the right; or moving the sun visor towards the interior of the vehicle.

[0012] Furthermore, in the above-mentioned sunshade light leakage verification method: the first set distance is 20 mm.

[0013] Furthermore, in the above-mentioned method for checking light leakage from the sunshade, the judgment of light leakage from above includes the following steps: Step 111: Measure the height of the upper light leakage area in the Y and Z directions, as well as the area of ​​the upper light leakage area; Step 112: If the width in the Y direction is less than the first threshold, the height in the Z direction is less than the second threshold, and the area is less than the third threshold, then there is no risk.

[0014] Furthermore, in the above-mentioned sunshade light leakage verification method: the first threshold is 40mm, the second threshold is 5mm, and the third threshold is 200mm².

[0015] Furthermore, the above-mentioned method for checking light leakage from sunshades also includes the following: If light leakage from above is unacceptable, it also includes: Step 113, the optimization step; the optimization direction includes widening the front windshield lace downwards, moving the sun visor towards the head, or moving the leftmost edge of the roof downwards.

[0016] The optimized results of this invention can be presented quantitatively, eliminating the need for model building or personnel review, thus achieving high efficiency and low cost.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the sunshade installation structure; Figure 2 This is a schematic diagram of an eye ellipse; 1 represents the left limit point of the left eye ellipse, and 2 represents the upper limit point of the left eye ellipse.

[0019] Figure 3 This is a schematic diagram of the sun visor in its initial state; Figure 4 This is a diagram showing the sun visor in its vertical position, 10° forward. Figure 5 This is a schematic diagram of the sunshade light adjustment in this invention; Figure 6 The first sun visor projection area is formed on the curved surface of the windshield; Figure 7 The projection area of ​​the left A-pillar is formed on the curved surface of the windshield; Figure 8 The roof projection area is formed on the curved surface of the windshield; Figure 9 This is a schematic diagram of the first union of the curved surfaces of the windshield; Figure 10 This is a schematic diagram of the light leakage area on the left side; Figure 11 This is a schematic diagram of the second union of the curved surfaces of the windshield; Figure 12 This is a flowchart of an embodiment of the present invention. Detailed Implementation

[0020] This embodiment describes how the sun visor is installed on the vehicle. Figure 1 The diagram illustrates a method for checking sun visor light leakage. This method addresses situations where light leaks above or to the left of the sun visor during driving, and effectively adjusts and optimizes the sun visor, roof edge, A-pillar edge, and windshield black border to avoid these issues. The flowchart is shown below. Figure 12 As shown: This embodiment mainly addresses the issue of light leakage from above or to the left during driving. It describes a method for effectively adjusting and optimizing the product's hard points, such as the sun visor (100mm), the roof (300mm) boundary, the A-pillar boundary, and the windshield (200mm) black edge, to avoid this problem.

[0021] The design concept of this embodiment is to calculate the 95th percentile eye ellipse based on the 95th percentile human body H point, accelerator pedal reference point, distance from the steering wheel center point to the accelerator pedal reference point in the X direction, distance from the R point to the heel point in the Z direction, and the Y coordinate value of the R point, according to the SAE standard, under the whole vehicle coordinate system.

[0022] Here, the H-point is the reference point for the driver's or passenger's hip joint position in car design, directly determining driving comfort, handling, safety, and visibility. The H-point (Hip Point) is the connection point between the human torso and the thigh (hip point), representing the position of the midpoint of the driver's hip joint inside the car after the driver is seated.

[0023] R-point (Regulatory Point) is a three-dimensional coordinate reference point used in automotive design to locate the positions of the driver and passenger seats, and it is also a key reference in the vehicle's coordinate system.

[0024] As the starting reference for human sitting posture, the position of point R directly determines the relative positional relationship of components such as point H (hip point), eye ellipse, steering wheel, and pedals.

[0025] The relationship between R point and H point: H point (Hip Point) is the actual hip position determined by an anthropometric dummy (such as the H point dummy specified in SAE J826), while R point is the theoretical benchmark set in the design phase. The two usually need to be consistent or within the allowable error range.

[0026] Application of SAE Standards in Eye Ellipse Calculation SAE (Society of Automotive Engineers) has developed several standards on ergonomics, among which SAE J941, "Recommended Practices for Driver Eye Ellipses," is the core basis for calculating eye ellipses.

[0027] Calculation logic: Input parameters include R-point coordinates (X, Y, Z), seat adjustment travel, H-point position, steering wheel position, pedal position, etc.

[0028] Eye ellipse generation: Based on 95th percentile human data (height, sitting eye height distribution, etc.), a statistical model is used to calculate the probability distribution area (ellipse shape) of the driver's eye position, which is used to verify the rationality of the design of the field of vision, interior rearview mirror arrangement, etc.

[0029] Based on the calculated eye ellipse, construct the left limit point 1 and the upper limit point 2 of the left eye ellipse, as follows: Figure 2 As shown.

[0030] Rotate the sun visor body from its initial position around its axis of rotation to a vertical position and forward 10°. Note that only the sun visor body should be rotated; do not rotate the base or mounting point together. The effect after rotation is as follows. Figure 3 and Figure 4 As shown. Figure 3 This indicates that the sun visor is in its initial state, while Figure 4 This indicates that the sun visor's rotation axis has rotated to a vertical position and is 10° forward.

[0031] like Figure 5 The diagram shown is a view of the sunshade 100, left A-pillar 400, windshield 200, glass trim 210, and roof 300 when the rotation axis of the sunshade 100 is rotated to a vertical position and forward 10°.

[0032] In this embodiment, other data that needs to be prepared include the CAS surface or data of the left A-pillar, the CAS surface or data of the roof, the outer surface of the windshield, and the black edge of the glass. All of these data should be combined. For example... Figure 5 As shown.

[0033] The principle used in this embodiment is that an object in three-dimensional space is projected onto an arbitrary parametric surface (such as a cylindrical surface, a sphere, or a freeform surface) through a fixed viewpoint (COP). The mathematical model and formula derivation are as follows: Let: Projection center (COP): Fixed point O ( ) A point on a three-dimensional object: P ( ) Target surface: Parametric equations Step 1: Construct the projection ray The parametric equation of the line from COP to point P: ,t≥0 Step 2: Find the intersection points of the ray and the surface. Solve the system of equations The demand value is solved iteratively.

[0034] In this embodiment, the method for verifying sun visor light leakage is as follows: This method addresses situations where light leakage occurs above or to the left of the sun visor during driving, and effectively adjusts and optimizes the sun visor, roof boundary, A-pillar boundary, and windshield black edge to avoid these issues. Light leaks from the left side of the sun visor Using the left extreme point 1 of the left eye ellipse as the projection center, project a point on the sun visor 100, positioned vertically forward at 10°, onto the curved surface 220 of the windshield 200; as shown... Figure 6 As shown: with the left extreme point of the left eye ellipse as the projection center, the points on the sun visor 100 are projected onto the curved surface 220 of the windshield to form the first sun visor projection area 110.

[0035] like Figure 7 As shown, the left extreme point 1 of the left eye ellipse is taken as the projection center, and the point on the left A-pillar 400 is projected onto the curved surface 220 of the windshield; the point on the left A-pillar 400 is projected onto the curved surface 220 of the windshield to form the left A-pillar projection area 410.

[0036] like Figure 8 As shown, the left extreme point 1 of the left eye ellipse is used as the projection center, and the points on the ceiling 300 are projected onto the curved surface 220 of the windshield; the points on the ceiling 300 are projected onto the curved surface 220 of the windshield to form the ceiling projection area 310.

[0037] On the curved surface 220 of the front windshield, the first union is formed by taking the union of the projection area 110 of the first sun visor and the projection area 310 of the left A-pillar. For example... Figure 9 As shown, The gap between the left edge of the sun visor projection and the lace line 221 (or the right edge of the A-pillar projection 411; whichever line is closer to the left edge of the sun visor projection is used) is the left-side light leakage area.

[0038] To assess the light leakage area on the left side, data processing is required. Offset the straight segment of the upper border line 221 every 20mm on the outer surface of the windshield 200, and extend the line to the left to border line 221 (or the right side line 411 of the A-pillar projection; use the line closer to the left edge of the sun visor projection). Measure the distance from the left edge of the sun visor projection to edge line 111 (or the right side line 411 of the A-pillar projection; use the line closer to the left edge of the sun visor projection 100), which is the length of segment ab. This length is generally less than 5mm, and is considered risk-free. This method can be used to verify excellent models on the market, and the results can be included in a database. If the distance is greater than 5mm, it can be compared with models in the database. Even if the distance is greater than 5mm, if it is close to the distance of excellent models on the market, it can be accepted. Figure 10 As shown.

[0039] Measure the gap between the ab bright spots on each line. If the distance between points a and b is too large and unacceptable, optimization is needed. Optimization directions: 1. Widen the trim to the right; 2. Widen the A-pillar, which will shift the trim to the right; 3. Move the sun visor towards the inside of the vehicle. These three methods can be used individually or in combination. Repeat the above steps using the optimized data until the requirements are met.

[0040] Below is a light leakage test of the area above the sunshade.

[0041] Using the upper limit point 2 of the left eye ellipse as the projection center, the point on the sun visor 100, which is 10° forward vertically, is projected onto the curved surface 220 of the windshield 200. Using the upper limit point of the left eye ellipse as the projection center, the point on the sun visor 100 is projected onto the curved surface 220 of the windshield to form the second sun visor projection area 120.

[0042] Using the upper limit point 2 of the left eye ellipse as the projection center, the points on the roof 300 are projected onto the curved surface 220 of the windshield; the points on the roof 300 are projected onto the curved surface 220 of the windshield to form the roof projection area 310.

[0043] On the curved surface 220 of the windshield, the projection area 120 of the second sun visor and the projection area 310 of the roof form a second union. For example... Figure 11 As shown, On the second union, it is determined that the lower edge and the edge line of the ceiling projection area 310 are close to the upper boundary of the second sunshade projection area 120. The upper edge line is formed by taking the part of the lower edge and the edge line of the ceiling projection area 310 that is close to the upper boundary of the second sunshade projection area 120. The gap between the upper boundary of the second sunshade projection area 120 and the upper edge line reflects the upper light leakage area S1.

[0044] Analysis of light leakage from above. Measure the height of the light leakage area S1 in the Y and Z directions, as well as its area. This method can be used to verify excellent car models on the market, and the results can be included in a database. Generally, a Y-direction width of less than 40mm, a Z-direction height of less than 5mm, and an area of ​​less than 200mm² are considered risk-free.

[0045] If risks exist, optimize in the following directions: 1. Widen the lace trim downwards; 2. Move the sun visor towards the head; 3. Lower the leftmost edge of the ceiling. These three methods can be used individually or in combination. Repeat the above steps using the optimized data until the requirements are met.

[0046] The method used in this embodiment has the following characteristics: 1. Results of Quantitative Optimization The optimized data is calculated according to this scheme, and the optimized results can be presented quantitatively without the need for modeling or organizing personnel for review.

[0047] 2. High efficiency The optimized data is calculated according to this scheme, and the optimized results can be presented quickly.

[0048] 3. Low cost No model validation is required, saving model costs.

Claims

1. A method for verifying light leakage of a sunshade, characterized in that: Includes the following steps: Step 1: In the vehicle coordinate system, based on the 95% human body H point, accelerator pedal reference point, distance from the steering wheel center point to the accelerator pedal reference point in the X direction, distance from the R point to the heel point in the Z direction, and the Y coordinate value of the R point, calculate the 95% percentile eye ellipse according to the SAE standard; based on the calculated eye ellipse, make the left limit point and upper limit point of the left eye ellipse. Step 2: Rotate the sun visor body from its initial position around its axis of rotation to a vertical position and then rotate it forward by a set angle. Step 3: Using the left extreme point of the left eye ellipse as the projection center, project the points on the sun visor onto the curved surface of the windshield to form the first sun visor projection area, and project the points on the left A-pillar onto the curved surface of the windshield to form the left A-pillar projection area. Using the upper limit point of the left eye ellipse as the projection center, the points on the sun visor are projected onto the curved surface of the windshield to form the second sun visor projection area, and the points on the roof are projected onto the curved surface of the windshield to form the roof projection area. Step 4: On the curved surface of the windshield, take the union of the first sun visor projection area and the left A-pillar projection area to form a first union; take the union of the second sun visor shadow area and the roof projection area to form a second union; Step 5: On the first union, determine that the right side line of the left A-pillar projection area and the lace line on the curved surface of the windshield are close to the left boundary of the first sun visor projection area. Take the part of the right side line of the left A-pillar projection area and the lace line that is close to the left boundary of the first sun visor projection area to form the left side line. On the second union, it is determined that the lower edge of the ceiling projection area and the lace line are close to the upper boundary of the first sunshade projection area, and the upper edge is formed by taking the part of the lower edge of the ceiling projection area and the lace line that is close to the upper boundary of the second sunshade projection area. Step 6: Determine the left light leakage area, which reflects the light leakage on the left side, by the gap between the left boundary of the first sun visor projection area to the left and the left side line; and the upper light leakage area, which reflects the light leakage on the upper side, by the gap between the upper boundary of the second sun visor projection area to the upper side line.

2. The method for checking light leakage of a sunshade according to claim 1, characterized in that: In step 2, the sunshade is rotated about its axis of rotation to a vertical position and forward by 10°.

3. The method for checking light leakage of a sunshade according to claim 2, characterized in that: Determining light leakage on the left side involves the following steps: Step 101: Offset the straight line segment of the upper lace line once every first predetermined distance on the outer surface of the windshield, and extend the straight line to the left to the left side line; Step 102: Measure the distance from the left edge of the projection area of ​​the first sunshade at the corresponding position to the left side line, and use this distance as the left light leakage distance to reflect the left light leakage situation.

4. The method for checking light leakage of a sunshade according to claim 3, characterized in that: Also includes: Step 103: If the light leakage distance on the left side is less than 5mm, it is considered to be risk-free.

5. The method for checking light leakage of a sunshade according to claim 4, characterized in that: Also includes: Step 104: If the light leakage distance on the left side is greater than 5mm, compare it with the car models in the database. If the distance is close to that of excellent car models on the market, then it can be accepted with a concession.

6. The method for checking light leakage of a sunshade according to claim 5, characterized in that: If light leakage on the left side is unacceptable, it also includes: Step 105: Optimization steps; the optimization direction includes widening the windshield trim to the right or widening the left A-pillar, and after widening the left A-pillar, moving the windshield trim to the right; or moving the sun visor towards the interior of the vehicle.

7. The method for checking light leakage of a sunshade according to any one of claims 3-6, characterized in that: The first set distance is 20 mm.

8. The method for checking light leakage of a sunshade according to claim 2, characterized in that: Determining whether there is light leakage from above involves the following steps: Step 111: Measure the height of the upper light leakage area in the Y and Z directions, as well as the area of ​​the upper light leakage area; Step 112: If the width in the Y direction is less than the first threshold, the height in the Z direction is less than the second threshold, and the area is less than the third threshold, then there is no risk.

9. The method for checking light leakage of a sunshade according to claim 8, characterized in that: The first threshold is 40mm, the second threshold is 5mm, and the third threshold is 200mm².

10. The method for checking light leakage of a sunshade according to claim 8, characterized in that: If light leakage from above is not acceptable, it also includes: Step 113, the optimization step; the optimization direction includes widening the front windshield lace downwards, moving the sun visor towards the head, or moving the leftmost edge of the roof downwards.

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