Dynamic test method for head-up display system and front windshield

Abstract

This invention discloses a dynamic testing method for a vehicle head-up display system and its windshield. The method includes: acquiring input information; obtaining the reflection point and angle bisector of the main optical axis of the head-up display system on the windshield based on the input information; obtaining the windshield boundary spline based on the reflection point and angle bisector, and generating a parametric surface based on the windshield boundary spline; determining whether the parametric surface meets optical requirements; if not, repeating the above steps; if yes, outputting the parametric surface information and output information. This method enables the study of optical component layout schemes in conventional engineering drawing software, solving the problem of mismatch between the calculation logic of optical analysis software and engineering drawing software. Furthermore, the dynamic testing layout method allows for simultaneous attention to more influencing factors, more flexible layout methods, and closer alignment with the actual process of vehicle development.

Description

Technical Field

[0001] This invention relates to the field of vehicle design technology, and in particular to a dynamic testing method for a vehicle head-up display system and windshield. Background Technology

[0002] Head-up displays (HUDs) are emerging intelligent in-vehicle components that place high demands on both spatial design and optics. Changes in human position, the position of the HUD's optical path, and the position of the windshield all affect the image quality. For example... Figure 1 As shown, the imaging principle of a head-up display (HUD) is mainly to reflect the image from the HUD onto the windshield and into the driver's eyes, thus forming a virtual image that appears directly in front of the viewer. The overall optical path is as follows: incident light path – windshield reflection – reflected light path – eye – imaging light path – virtual image. The direction of the light path and the position, angle, and curvature of the windshield all affect the size, distance, and other imaging effects of the final virtual image. This method is applicable to various types of optical imaging components, such as C-HUD, W-HUD, AR-HUD, and Semi-HUD, including but not limited to the imaging component systems listed above.

[0003] For applications in vehicles, since the windshield is a component of the head-up display's (HUD) imaging optical path, current setups rely on HUD component manufacturers using optical analysis software to recommend HUD positions based on the windshield location input by the OEM. Following the manufacturer's recommendations, the OEM assesses structural avoidance strategies within the vehicle to ensure adequate space and optical path for the HUD, thereby achieving the desired display effect.

[0004] This method relies solely on a one-way approach: analyzing the windshield, the head-up display's optical path, determining the head-up display's position, and considering surrounding structural constraints. If the spatial structure is insufficient, this method cannot provide positive feedback to correct the solution. It involves a process of elimination and trial and error, leading to an uncontrollable element of chance in finding the correct layout, and the process is lengthy. Furthermore, this method is typically led by head-up display manufacturers and uses specialized optical software, which has a different computational logic than the CAD software commonly used in automotive design and development. It can only consider the single element of windshield position changes and cannot simultaneously account for the influence of multiple elements within the vehicle, such as the head-up display's optical path position, the user's eye position, and surrounding structural limitations. This hinders the selection of the optimal overall vehicle layout. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of the existing head-up display placement methods being simple, having long placement cycles, and being inefficient.

[0006] To address the aforementioned technical problems, embodiments of the present invention disclose a dynamic testing method for a vehicle head-up display system and a windshield, the method comprising:

[0007] S1: Obtain input information and obtain the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield based on the input information. The angle bisector is the normal of the reflection point on the windshield.

[0008] S2: Obtain the front windshield boundary spline based on the reflection point and angle bisector, and generate a parametric surface based on the front windshield boundary spline;

[0009] S3: Determine whether the parametric surface meets the optical requirements;

[0010] If not, repeat step S2;

[0011] If so, output the information of the parameterized surface and the output information.

[0012] By adopting the above technical solution, the layout scheme of optical components and vehicle components can be determined more flexibly and efficiently. This method enables the study of optical component layout schemes in conventional engineering drawing software, solving the problem of incompatibility between the calculation logic of optical analysis software and engineering drawing software. The dynamic experimental layout method allows for simultaneous attention to more influencing factors, resulting in a more flexible layout method that more closely reflects the actual process of vehicle development.

[0013] Furthermore, this method allows for the effective and clear determination of optimization directions for solution design. For newly developed vehicle models, it enables the rapid determination of parameters such as the head-up display's optical path and windshield curvature, thereby completing the overall layout plan. For existing vehicle models or preliminary research, it allows for the rapid determination of the head-up display's optical path and physical location based on the existing windshield position, thus supporting project decision-making and development.

[0014] The present invention also discloses a dynamic testing method for a vehicle head-up display system and a windshield. The input information includes the main optical axis of the vehicle head-up display system, the windshield range, the adjustment range, the virtual image displayed by the vehicle head-up display system, and the driver's eye point.

[0015] Using the above technical solution, during the development of a new vehicle model, when a head-up display (HUD) system is required and the windshield position is still being adjusted, obtaining specific windshield data during testing requires inputting the incident ray and incident angle of the HUD system's optical path, the main optical axis of the entire vehicle's HUD system, the width and length range of the windshield, the windshield's adjustment range, the position of the virtual image displayed by the entire vehicle's HUD system, and the driver's eye position. Based on this data, the interaction between the optical path principle and the windshield's curvature is used to adjust the glass surface to meet the curvature requirements. Furthermore, data collection and acquisition are relatively simple.

[0016] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, wherein the input information includes the glass curvature of the windshield and the thickness of the glass curvature.

[0017] Using the above technical solution, after the car model and windshield have been determined, the recommended placement position and main optical axis of the head-up display are found through the existing head-up display optical path. When determining the physical position of the head-up display and the feasibility of its placement in the surrounding physical environment through the main optical axis, the parameters of the windshield's glass curvature are input into the input information, and then the optimal placement position is obtained based on the optical path and the windshield.

[0018] The present invention also discloses a dynamic testing method for a vehicle head-up display system and a windshield. The method for obtaining the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield based on input information includes:

[0019] S11: Based on the input information, obtain the intersection of the incident light path and the reflected line of the vehicle head-up display system; the reflected line is the light path between the eye point and the windshield;

[0020] S12: Draw the angle bisector of the incident light path and the reflected light at the intersection.

[0021] Using the above technical solution, the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield are obtained in the engineering drawing software based on the input information. In other words, the reflection point and angle bisector of the optical path on the windshield are found, and subsequent processing is performed based on the reflection point and angle bisector.

[0022] The present invention also discloses a dynamic testing method for a vehicle head-up display system and a windshield, wherein the method for obtaining the windshield boundary spline based on the reflection point includes:

[0023] S21: Generate a first reference plane and a second reference plane based on the windshield range; the first reference plane is the center line of the windshield, and the second reference plane is the reference plane on the driver's side that exceeds the optical path range of the vehicle head-up display system;

[0024] S22: Project projection points are generated by projecting the reflection points onto the first and second reference planes. Projection points are then made on the input windshield range, and the upper and lower boundary points of the windshield are made on the first and second reference planes, respectively.

[0025] S23: Generate n first section spline lines on the first reference plane through projection points and reflection points, and generate n second section spline lines on the second reference plane through projection points and reflection points, where n is greater than or equal to 2;

[0026] S24: Stretch the first reference surface along the end away from the second reference surface to generate a support surface;

[0027] S25: Generate a parametric surface based on the support surface, the first section spline, and the second section spline.

[0028] Using the above technical solution and method, parametric surfaces of the windshield can be generated in engineering drawing software. Furthermore, multiple splines can be generated based on the windshield's extent and the first and second reference surfaces, and then parametric surfaces can be generated from these splines using engineering drawing software. Moreover, parametric surfaces with different curvatures and sizes can be obtained based on different windshield extents and reference surfaces.

[0029] The embodiments of the present invention also disclose a dynamic test method for a vehicle head-up display system and a windshield. The method for determining whether the parametric surface meets the optical requirements includes: bandwidth verification, curvature verification, and main optical axis verification of the vehicle head-up display system.

[0030] By adopting the above technical solution, after obtaining the parametric surface, the parametric surface is checked to obtain the most accurate and optimal windshield glass, which meets the requirements of the vehicle head-up display system for use and display.

[0031] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, wherein the bandwidth verification method includes:

[0032] S31: Arrange multiple checkpoints on the parametric surface;

[0033] S32: Determine if the bandwidth value meets the requirements and check if the bandwidth value is less than the set threshold; where the bandwidth value is the difference between the parametric surface and the windshield range, and the set threshold is 5mm;

[0034] If not, adjust the number of checkpoints or the threshold, and repeat step S32;

[0035] If so, then perform curvature verification.

[0036] By adopting the above technical solution, multiple checkpoints are set on the parametric surface during bandwidth verification, thereby improving the accuracy and precision of the verification. When the difference between the parametric surface and the windshield exceeds the threshold, the position and number of checkpoints can be adjusted first, or different parametric surfaces can be used for verification. Finally, the bandwidth value of the parametric surface is within the threshold range, and the next step of verification can be performed.

[0037] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, wherein curvature verification includes:

[0038] S31': Input the main optical axis of the vehicle head-up display system and generate a tangent plane based on the main optical axis;

[0039] S32': Based on the size of the cutting plane, project it onto the parametric surface to determine the inspection area, and at the same time generate multiple cross-sectional lines and multiple longitudinal cross-sectional lines of the vehicle head-up display area;

[0040] S33': Measure fixed points Ry and Rz on the cross-section line with fixed step sizes;

[0041] S34': Determine whether Ry and Rz meet the requirements;

[0042] If not, set the parameters for the tangent plane and section line and repeat the above steps; if yes, then perform a main optical axis check for the vehicle head-up display system.

[0043] Using the above technical solution, after the bandwidth verification is qualified, the curvature verification is performed. Multiple tangent planes and multiple cross-section lines are generated on the parametric surface, and the detection and verification are performed according to the fixed step size on the cross-section lines. If the requirements are not met, the tangent planes and cross-section lines need to be reset, or the curvature of the parametric surface needs to be readjusted, so as to obtain the most accurate parametric surface.

[0044] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, wherein the main optical axis calibration of the vehicle head-up display system includes:

[0045] S31'': Input eye point and parametric surface, and generate another head-up display system main optical axis for comparison based on the eye point and parametric surface;

[0046] S32'': Measure the angle difference between the main optical axis of another head-up display system and the main optical axis of the input head-up display system, and determine whether the angle difference is less than the set threshold;

[0047] If yes, record the angle difference; otherwise, set the optical path parameters and repeat the above steps.

[0048] Using the above technical solution, after the bandwidth and curvature verifications are passed, a parametric surface is used to replace the windshield for optical path verification and adjustment. That is, a reflected light path and an incident light path are derived from the input eye point on the parametric surface. The angle difference between the derived light path and the actual light path is measured. If the angle difference is less than the preset angle, the parametric surface is equivalent to a qualified windshield glass surface. If the angle difference is greater than the preset value, the parameters are adjusted and re-verified.

[0049] The present invention also discloses a dynamic testing method for a vehicle head-up display system and a windshield. The output information includes information on multiple parametric surfaces, multiple incident and reflected light paths of the vehicle head-up display system, the light path before the test, and the angle adjustment amount of the light path obtained during the test.

[0050] The above technical solution requires multiple experiments to ultimately obtain multiple parametric surfaces, multiple incident and reflected light paths for the vehicle head-up display system, the light path before the experiment, and the angle adjustment amount of the light path obtained during the experiment. During vehicle development, the most suitable parametric surfaces, incident and reflected light paths for the vehicle head-up display system, and angle adjustment amount of the light path can be selected according to actual needs.

[0051] The beneficial effects of this invention are:

[0052] Based on the input information, the reflection point and angle bisector of the main optical axis of the vehicle's head-up display (HUD) on the windshield are obtained. Then, the windshield boundary spline is obtained based on the reflection point and angle bisector, and a parametric surface is generated based on the windshield boundary spline. Finally, it is determined whether the parametric surface meets the optical requirements, and bandwidth, curvature, and the main optical axis of the vehicle's HUD are verified. This results in multiple standard parametric surfaces that meet the requirements. In vehicle development, the optimal parametric surface can be selected as the windshield surface. Furthermore, for existing vehicle models or preliminary research, the optical path and physical location of the HUD can be quickly determined based on the existing windshield position, thereby supporting project decision-making and development.

[0053] The method provided by this invention enables more flexible and efficient determination of the layout scheme for optical components and vehicle parts. This method allows for the study of optical component layout schemes within conventional engineering drawing software, resolving the mismatch between the calculation logic of optical analysis software and engineering drawing software. Employing a dynamic experimental layout method allows for simultaneous attention to more influencing factors, resulting in a more flexible layout approach that more closely reflects the actual process of vehicle development. Attached Figure Description

[0054] Figure 1 Optical path diagram of the head-up display system;

[0055] Figure 2This is a flowchart of a dynamic testing method for a vehicle head-up display system and a windshield provided in Embodiment 1 of the present invention;

[0056] Figure 3 A flowchart of another dynamic test method for a vehicle head-up display system and a windshield provided in Embodiment 2 of the present invention;

[0057] Figure 4 A flowchart for generating parametric surfaces in the dynamic testing method of the vehicle head-up display system and windshield provided in Embodiment 1 of the present invention;

[0058] Figure 5 This is a flowchart illustrating the bandwidth verification process in the dynamic testing method for the vehicle head-up display system and windshield provided in Embodiment 1 of the present invention.

[0059] Figure 6 A flowchart illustrating the curvature calibration process in the dynamic testing method for the vehicle head-up display system and windshield provided in Embodiment 1 of the present invention;

[0060] Figure 7 This is a flowchart illustrating the main optical axis calibration process in the dynamic testing method for the vehicle head-up display system and windshield provided in Embodiment 1 of the present invention.

[0061] Figure 8 This is a schematic diagram of the reflection point and angle bisector obtained in the dynamic test method of the vehicle head-up display system and the windshield provided in Embodiment 1 of the present invention.

[0062] Figure 9 This is a schematic diagram of the generation of parametric surfaces in the dynamic testing method of the vehicle head-up display system and the windshield provided in Embodiment 1 of the present invention.

[0063] Figure 10 This is a schematic diagram of the generation of a parametric surface based on the support surface in the dynamic testing method of the vehicle head-up display system and the windshield provided in Embodiment 1 of the present invention.

[0064] Figure 11 This is a schematic diagram of the parametric surface generated in the dynamic test method of the vehicle head-up display system and the windshield provided in Embodiment 1 of the present invention;

[0065] Figure 12 This is a schematic diagram of the optical path relationship between the vehicle head-up display system and the windshield in the dynamic test method provided in Embodiment 1 of the present invention;

[0066] Figure 13 This is a schematic diagram of the generation of the main optical axis in the dynamic test method of the whole vehicle head-up display system and the windshield provided in Embodiment 1 of the present invention;

[0067] Figure 14The parameter values ​​of Ry and Rz are used in the dynamic test method of the vehicle head-up display system and windshield provided in Embodiment 1 of the present invention. Detailed Implementation

[0068] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0069] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0070] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0071] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0072] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0073] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0074] Example 1

[0075] As a preferred embodiment of the present invention, this embodiment discloses a dynamic testing method for a vehicle head-up display system and a windshield, such as... Figure 2 and Figure 3 As shown, the method includes:

[0076] S1: Obtain input information and obtain the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield based on the input information. The angle bisector is the normal of the reflection point on the windshield.

[0077] S2: Obtain the front windshield boundary spline based on the reflection point and angle bisector, and generate a parametric surface based on the front windshield boundary spline;

[0078] S3: Determine whether the parametric surface meets the optical requirements;

[0079] If not, repeat step S2;

[0080] If so, output the information of the parametric surface and the output information. The parametric surface is as follows: Figure 11 As shown.

[0081] Specifically, in this embodiment, the method relies on conventional CAD software to study the layout scheme of optical components in conventional engineering drawing software, which solves the problem of mismatch between the calculation logic of optical analysis software and engineering drawing software. For example, this method can be used in common engineering drawing software such as AutoCAD, UG, and Solidworks. Those skilled in the art can select and design according to actual needs. This embodiment does not make specific limitations in this regard.

[0082] More specifically, in this embodiment, different input information results in different reflection points and angle bisectors, as well as different boundary splines and parametric surfaces. It should be noted that in this embodiment, there can be multiple incident and reflected light paths and boundary splines. The more incident and reflected light paths and boundary splines there are, the more accurate the final parametric surface will be.

[0083] More specifically, in this embodiment, by employing the principle of optical path interaction and adjusting the windshield surface to obtain a parametric surface that meets the curvature requirements, multiple parametric surfaces are generated. Those skilled in the art can select the optimal parametric surface as the windshield surface based on the vehicle's requirements and actual conditions. This allows for a more flexible and efficient determination of the arrangement scheme between optical components and vehicle components. The dynamic experimental arrangement method allows for simultaneous attention to more influencing factors, resulting in a more flexible arrangement method that more closely reflects the actual process of vehicle development.

[0084] Furthermore, this method allows for the effective and clear determination of optimization directions for solution design. For newly developed vehicle models, it enables the rapid determination of parameters such as the head-up display's optical path and windshield curvature, thereby completing the overall layout plan. For existing vehicle models or preliminary research, it allows for the rapid determination of the head-up display's optical path and physical location based on the existing windshield position, thus supporting project decision-making and development.

[0085] The present invention also discloses a dynamic testing method for a vehicle head-up display system and a windshield. The input information includes the main optical axis of the vehicle head-up display system, the windshield range, the adjustment range, the virtual image displayed by the vehicle head-up display system, and the driver's eye point.

[0086] Specifically, in this embodiment, the main optical axis of the vehicle head-up display system in the input information can be the light source of the vehicle head-up display system. The main optical axis can be a collection of multiple incident points. For example, in the actual production process, the incident light path of the vehicle head-up display system is actually a collection of countless light paths. In this solution, the incident light path can be replaced by the main optical axis of the vehicle head-up display system. Those skilled in the art can make adjustments according to specific circumstances and actual needs, such as selecting one point or a collection of multiple points. This embodiment does not make specific limitations in this regard.

[0087] More specifically, in this embodiment, such as Figure 8 As shown, the driver's eye point is actually a set of multiple points. For example, this set can be replaced by a shape with a specific size. In reality, the position of the eye point is different when the driver's height or position is different. Therefore, the position of the eye point is replaced by a set of points instead of specific points, which makes the accuracy and applicability of the parametric surface obtained from the experiment higher.

[0088] More specifically, in this embodiment, since the head-up display system is determined, the main optical axis of the vehicle head-up display system is also determined, the incident optical path of the vehicle head-up display system is also determined, and the driver's eye point is also determined, the range and adjustment range of the windshield are then input, and repeated tests are conducted in engineering drawing software using these data.

[0089] More specifically, in this embodiment, different vehicle models have different windshield ranges and different adjustment ranges. The windshield range also includes parameters such as the windshield length range, width range, and height range, which are not specifically limited in this embodiment.

[0090] More specifically, in this embodiment, when designing experiments, those skilled in the art can also input other parameters according to actual needs, such as different head-up display systems, different virtual image sizes and positions, windshield thickness, refractive index, and other parameters. This embodiment does not specifically limit these parameters.

[0091] It should be noted that, in this embodiment, when obtaining a suitable windshield glass using the dynamic testing method of the whole vehicle head-up display system and the windshield, the directly input information includes the main optical axis of the whole vehicle head-up display system, the eye point, and the windshield range, and their adjustment range can also be adjusted. During the experiment, the glass thickness, virtual image size and position, eye point size and position, complete optical path of the eye point, HUD and virtual image, windshield curvature requirements, etc., can also be input according to actual needs. Those skilled in the art can adjust these according to actual needs or the requirements of different engineering drawing software. This embodiment does not make specific limitations in this regard.

[0092] More specifically, in this embodiment, during the development of a new vehicle model, when a head-up display (HUD) system needs to be configured and the windshield position is still being adjusted, the specific data for the windshield obtained through testing requires inputting the incident ray and incident angle of the HUD system's optical path, the main optical axis of the vehicle's HUD system, the width and length range of the windshield, the adjustment range of the windshield, the position of the virtual image displayed by the vehicle's HUD system, and the position of the driver's eye point. Based on this data, the interaction between the optical path principle and the windshield surface is adjusted to obtain a glass surface that meets the curvature requirements. Furthermore, data collection and acquisition are relatively simple, and existing data from the vehicle or the HUD system can be used.

[0093] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, such as... Figure 4 and Figure 8 As shown, the method for obtaining the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield based on the input information includes:

[0094] S11: Based on the input information, obtain the intersection of the incident light path and the reflected line of the vehicle head-up display system; the reflected line is the light path between the eye point and the windshield;

[0095] S12: Draw the angle bisector of the incident light path and the reflected light at the intersection.

[0096] Specifically, in this embodiment, when the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield are obtained based on the input information, the accuracy of the experiment can be improved and the most suitable data can be obtained by using data from one or more reflection points and angle bisectors, and multiple sets of data can be used.

[0097] For example, when obtaining the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield, five, six, or more sets of data can be obtained based on the input information. The most standard data can be selected, or the average of multiple sets of data can be calculated for the next test. Those skilled in the art can also use other methods to conduct the test. This embodiment does not specifically limit this.

[0098] More specifically, in this embodiment, the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield are obtained in the engineering drawing software based on the input information. That is, the reflection point and angle bisector of the optical path on the windshield are found, and subsequent processing is performed based on the reflection point and angle bisector.

[0099] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, such as... Figure 4 and Figure 9 As shown, the methods for obtaining the front windshield boundary spline based on the reflection point include:

[0100] S21: Generate a first reference plane and a second reference plane based on the windshield range; the first reference plane is the center line of the windshield, and the second reference plane is the reference plane on the driver's side that extends beyond the optical path range of the vehicle head-up display system.

[0101] S22: Project projection points are generated by projecting the reflection points onto the first and second reference planes. Projection points are then made on the input windshield range, and the upper and lower boundary points of the windshield are made on the first and second reference planes, respectively.

[0102] S23: Generate n first section spline lines on the first reference plane through projection points and reflection points, and generate n second section spline lines on the second reference plane through projection points and reflection points, where n is greater than or equal to 2;

[0103] S24: Stretch the first reference surface along the end away from the second reference surface to generate a support surface;

[0104] S25: Generate a parametric surface based on the support surface, the first section spline, and the second section spline.

[0105] Specifically, in this embodiment, the first reference surface is set as the center line of the windshield. The first reference surface may vary depending on the vehicle model or the specific windshield. The second reference surface can be adjusted according to actual needs. Specifically, to ensure a more accurate parametric surface, the second reference surface is preferably a reference surface on the driver's side that extends beyond the optical path of the vehicle's head-up display system. The specific location is not limited in this embodiment.

[0106] More specifically, in this embodiment, planar projections are made onto the first and second reference planes to generate projection points, and the upper and lower boundary points of the windshield are respectively marked on the first and second reference planes. Furthermore, multiple first-section spline lines are generated on the first reference plane using the projection points and reflection points, and multiple second-section spline lines are generated on the second reference plane using the projection points and reflection points. In actual experiments, the number of first-section and second-section spline lines generated can be infinite, and as... Figure 10 As shown, the first reference surface is stretched along the end away from the second reference surface to generate a support surface, and a parametric surface is generated based on the support surface, the first section spline, and the second section spline.

[0107] More specifically, in this embodiment, such as Figure 9 As shown, the steps for generating splines and parametric surfaces are as follows:

[0108] a: Generate the Y0 plane (i.e., the first reference plane) and the Y- plane (i.e., the second reference plane) based on the windshield boundary data (windshield range);

[0109] b: Project the highest reflection point A and the lowest reflection point B onto the Y0 plane, and then project them onto the reference windshield in the normal direction to generate projection points A', B'. On the Y0 plane, make two points E', F' of the upper and lower boundaries according to the windshield boundary.

[0110] c: Use four points A', B', E', F' on the Y0 plane to form spline 1 on the Y0 section. Use the same method to generate four points A”, B”, E”, F” on the Y-plane to form spline 2 on the Y-section. At the same time, use the projection points a, c and A', A” of points A and C on the windshield, and the projection points b, d and B', B” of points B and D on the windshield to make two transverse splines 3 and 4.

[0111] d: By adjusting these 12 points, a total of 4 splines are generated. The number of feature points and splines can be set and adjusted as needed;

[0112] e: such as Figure 10 As shown, to ensure the continuity of the glass in the Y0 plane, the spline on the Y0 plane is first stretched along the Y+ direction to serve as a support surface. Then, a parametric surface is generated based on the support surface and the spline. The generated parametric surface is shown in the figure. Figure 11 As shown.

[0113] It should be noted that, in actual experiments, those skilled in the art can adjust the number of splines and projection points according to actual needs, and this embodiment does not impose specific limitations on this.

[0114] More specifically, in this embodiment, the above method enables the generation of parametric surfaces of the windshield in engineering drawing software. Specifically, the parametric surfaces are generated from cross-sectional splines on a first and second reference surface using the engineering drawing software. Furthermore, parametric surfaces with different curvatures and sizes can be obtained based on different windshield ranges and reference surfaces.

[0115] The embodiments of the present invention also disclose a dynamic test method for a vehicle head-up display system and a windshield. The method for determining whether the parametric surface meets the optical requirements includes: bandwidth verification, curvature verification, and main optical axis verification of the vehicle head-up display system.

[0116] Specifically, in this embodiment, after obtaining the parametric surface, the bandwidth, curvature, and main optical axis of the vehicle head-up display system are checked to obtain the most accurate and optimal windshield surface, which meets the requirements of the vehicle head-up display system for use and display.

[0117] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, such as... Figure 5 As shown, the bandwidth verification methods include:

[0118] S31: Arrange multiple checkpoints on the parametric surface;

[0119] S32: Determine if the bandwidth value meets the requirements and check if the bandwidth value is less than the set threshold; where the bandwidth value is the difference between the parametric surface and the windshield range, and the set threshold is 5mm;

[0120] If not, adjust the number of checkpoints or the threshold, and repeat step S32;

[0121] If so, then perform curvature verification.

[0122] Specifically, in this embodiment, bandwidth verification is also equivalent to windshield range error verification. When performing bandwidth verification, multiple checkpoints are arranged on the parametric surface. The number of checkpoints is set according to actual needs. For example, multiple checkpoints can be set at the edge of the parametric surface and multiple checkpoints can be set at the center position, or multiple checkpoints can be evenly set on the parametric surface to improve the inspection accuracy.

[0123] More specifically, in this embodiment, the bandwidth value being checked is the error of the parametric surface at the position of the windshield glass surface. It can be the range of the difference between the initial position of the parametric surface and the windshield, or it can be other errors such as the width error or length error between the parametric surface and the actual windshield. Those skilled in the art can perform multiple tests and adjustments during the experiment.

[0124] More specifically, in this embodiment, the threshold value of the bandwidth is set to 5mm. To improve accuracy, it can be set to 4mm or 3mm. When the accuracy requirement is not high, it can be set to other values ​​such as 6mm, 7mm, or 8mm.

[0125] More specifically, in this embodiment, during the verification process, if the difference between the parametric surface and the windshield is greater than the threshold, and if a surface that meets the bandwidth requirement cannot be obtained no matter what attempts are made when checking and calculating according to the set bandwidth requirement, the position and number of check points can be adjusted first. If the difference is still greater than the threshold after adjustment, different parametric surfaces or the threshold can be adjusted for verification, such as adjusting the threshold to 8mm, 10mm, etc. The bandwidth value of the finally obtained parametric surface is within the threshold range, and the next step of verification can be performed.

[0126] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, such as... Figure 6 As shown, curvature verification includes:

[0127] S31': Input the main optical axis of the vehicle head-up display system and generate a tangent plane based on the main optical axis;

[0128] S32': Based on the size of the cutting plane, project it onto the parametric surface to determine the inspection area, and at the same time generate multiple cross-sectional lines and multiple longitudinal cross-sectional lines of the vehicle head-up display area;

[0129] S33': Measure fixed points Ry and Rz on the cross-section line with fixed step sizes;

[0130] S34': Determine whether Ry and Rz meet the requirements;

[0131] If not, set the parameters for the tangent plane and section line and repeat the above steps; if yes, then perform a main optical axis check for the vehicle head-up display system.

[0132] Specifically, in this embodiment, during curvature verification, multiple tangent planes and multiple cross-sectional and longitudinal sections are generated on the parametric surface. A tangent plane refers to a plane that passes through the intersection of the main optical axis and the windshield, and is tangent to the plane containing this intersection. The size of the tangent plane can be determined based on the beam range of the vehicle's head-up display system. The size of the tangent plane is defined, and verification is performed based on a fixed step size on the cross-sectional lines. If the requirements are not met, the tangent planes and cross-sectional lines need to be reset, or the curvature of the parametric surface needs to be readjusted to obtain the most accurate parametric surface. Through curvature verification, the most accurate parametric surface that is closest to the required windshield curvature can be obtained.

[0133] More specifically, in this embodiment, the definitions and required values ​​of Ry and Rz are as follows: Figure 14As shown, Ry represents the radius of curvature of a point on the windshield on the longitudinal curve passing through that point, and Rz represents the radius of curvature of a point on the windshield on the transverse curve passing through that point. In this embodiment, Rz specifically refers to the transverse and longitudinal radii of curvature of the check point on the parameterized surface.

[0134] It should be noted that those skilled in the art can adjust the curvature range according to actual needs during actual experiments. The curvature range includes, but is not limited to, [the range of curvature]. Figure 14 The range of parameters limiting curvature.

[0135] More specifically, in this embodiment, curvature verification can also be performed in other ways. Those skilled in the art can choose according to specific circumstances and actual needs. This embodiment does not impose specific limitations on this.

[0136] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield, such as... Figure 7 As shown, the main optical axis calibration of the vehicle head-up display system includes:

[0137] S31'': Input eye point and parametric surface, and generate another head-up display system main optical axis for comparison based on the eye point and parametric surface;

[0138] S32'': Measure the angle difference between the main optical axis of another head-up display system and the main optical axis of the input head-up display system, and determine whether the angle difference is less than the set threshold;

[0139] If yes, record the angle difference; otherwise, set the optical path parameters and repeat the above steps.

[0140] Specifically, in this embodiment, the main optical axis calibration of the vehicle head-up display system is also equivalent to the optical path calibration. After the bandwidth calibration and curvature calibration are qualified, the optical path is calibrated and adjusted by replacing the windshield with a parametric surface. That is, a reflected optical path and an incident optical path are derived from the input eye point on the parametric surface. The angle difference between the derived optical path and the actual optical path is measured. If the angle difference is less than the preset angle, the parametric surface is equivalent to a qualified windshield glass surface. If the angle difference is greater than the preset value, the parameters are adjusted and recalibrated.

[0141] More specifically, in this embodiment, the threshold for calibrating the main optical axis of the vehicle head-up display system is set to 3°. In actual development and testing, it can also be set to 2°, 4°, 5° or other degrees. This embodiment does not make specific limitations on this.

[0142] More specifically, in this embodiment, when performing the main optical axis calibration of the vehicle head-up display system, if it is found that a surface that meets the requirements cannot be obtained no matter what attempts are made when checking and calculating with the set threshold, the angle threshold can be relaxed, for example, the set angle threshold can be adjusted from 3° to 5° for further calibration.

[0143] More specifically, in this embodiment, when verifying the parametric surface: bandwidth verification is equivalent to adjusting the size and range of the parametric surface and the windshield; curvature verification is equivalent to verifying the curvature of the parametric surface and the windshield glass surface; and main optical axis verification of the vehicle head-up display system is equivalent to adjusting and verifying the optical path. Those skilled in the art may also choose other methods for verification, which will not be elaborated in this embodiment.

[0144] The embodiments of the present invention also disclose a dynamic testing method for a vehicle head-up display system and a windshield. The output information includes multiple parametric surfaces, multiple incident and reflected light paths of the vehicle head-up display system, the light path before the test, and the angle adjustment amount of the light path obtained during the test.

[0145] Specifically, in this embodiment, multiple experiments are required to ultimately obtain multiple parametric surfaces, multiple incident and reflected light paths of the vehicle head-up display system, the light path before the experiment, and the angle adjustment amount of the light path obtained during the experiment. For example... Figure 12 and Figure 13 As shown, multiple sets of optical path relationships and the optical path for generating the principal optical axis are displayed. In vehicle development, the most suitable parametric surface, incident and reflected light of the vehicle head-up display system, and the angle adjustment of the optical path can be selected according to actual needs.

[0146] Example 2

[0147] As another preferred embodiment of the present invention, the present invention also discloses a dynamic testing method for a vehicle head-up display system and a windshield, wherein the input information includes the glass surface of the windshield and the thickness of the glass surface.

[0148] Specifically, such as Figure 3 As shown, this embodiment corresponds to different application scenarios: for vehicle models where the windshield position is already determined, such as upgrades to mass-produced models, where key vehicle information such as the windshield position and eye point remains unchanged, the feasibility of developing a new head-up display system is evaluated. In this case, given the virtual image, eye point, and windshield, the input information can be modified through the existing head-up display system optical path to increase the information and thickness of the windshield's glass curvature.

[0149] Based on different input information, complete and appropriate reflected and incident light paths are obtained, and then estimated, adjusted, and verified on the entire vehicle. The specific method is as follows:

[0150] like Figure 4 and Figure 8 As shown, the method described in Example 1 for obtaining the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield based on the input information is used to obtain the actual reflection point and angle bisector based on the input information.

[0151] Based on the actual windshield data, the actual incident light path and reflected light path are obtained, and the light path is adjusted and verified. If the existing windshield does not meet the requirements, the curvature requirements can be adjusted, the light path requirements can be adjusted, and the head-up display system or windshield can be adjusted according to the needs.

[0152] Using the above technical solution, after the car model and windshield have been determined, the recommended placement position and main optical axis of the head-up display system are found through the existing optical path of the head-up display system. When determining the physical position of the head-up display system and the feasibility of its placement in the surrounding physical environment through the main optical axis, the parameters of the curved surface of the windshield are input into the input information, and then the optimal placement position is obtained based on the optical path and the windshield.

[0153] In summary, this invention discloses a dynamic testing method for a vehicle head-up display (HUD) system and its connection to the windshield. Based on input information, the reflection point and angle bisector of the HUD's principal optical axis on the windshield are obtained. Then, the windshield boundary spline is derived from the reflection point and angle bisector, and a parametric surface is generated based on this spline. Finally, the method determines whether the parametric surface meets optical requirements, performing bandwidth, curvature, and principal optical axis verification for the HUD system. This yields multiple standard parametric surfaces that meet the requirements. In vehicle development, the optimal parametric surface can be selected as the windshield surface. Furthermore, for existing vehicle models or preliminary research, the optical path and physical location of the HUD can be quickly determined based on the existing windshield position, thus supporting project decision-making and development.

[0154] The method provided by this invention enables more flexible and efficient determination of the layout scheme for optical components and vehicle parts. This method allows for the study of optical component layout schemes within conventional engineering drawing software, resolving the mismatch between the calculation logic of optical analysis software and engineering drawing software. Employing a dynamic experimental layout method allows for simultaneous attention to more influencing factors, resulting in a more flexible layout approach that more closely reflects the actual process of vehicle development.

[0155] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A dynamic testing method for a vehicle head-up display system and a windshield, characterized in that, The method includes: S1: Obtain input information, and obtain the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield based on the input information, wherein the angle bisector is the normal of the reflection point on the windshield; S2: Obtain the front windshield boundary spline based on the reflection point and the angle bisector, and generate a parametric surface based on the front windshield boundary spline; S3: Determine whether the parameterized surface meets the optical requirements; If not, repeat steps S2-S3; If so, output the information of the parameterized surface.

2. The dynamic testing method for the vehicle head-up display system and windshield as described in claim 1, characterized in that, The input information includes the main optical axis of the vehicle head-up display system, the windshield range, the adjustment range, the virtual image displayed by the vehicle head-up display system, and the driver's eye point.

3. The dynamic testing method for the vehicle head-up display system and windshield as described in claim 2, characterized in that, The input information also includes the thickness of the windshield glass and the curvature requirements of the glass surface.

4. The dynamic testing method for the vehicle head-up display system and windshield as described in claim 2, characterized in that, The method for obtaining the reflection point and angle bisector of the main optical axis of the vehicle head-up display system on the windshield based on the input information includes: S11: Based on the input information, obtain the intersection of the incident light path and the reflected line of the vehicle head-up display system; the reflected line is the light path between the eye point and the windshield; S12: Draw the angle bisector of the incident light path and the reflected line at the intersection point.

5. The dynamic testing method for the vehicle head-up display system and windshield as described in claim 2, characterized in that, The method for obtaining the front windshield boundary spline based on the reflection point includes: S21: Generate a first reference surface and a second reference surface based on the windshield range; the first reference surface is the center line of the windshield, and the second reference surface is a reference surface on the driver's side that extends beyond the optical path range of the vehicle head-up display system; S22: Project the reflection point onto the first reference surface and the second reference surface to generate projection points, and make projection points on the input windshield range respectively, and make the upper boundary point and lower boundary point of the windshield on the first reference surface and the second reference surface respectively. S23: Generate n first cross-section spline lines on the first reference plane through the projection point and the reflection point, and generate n second cross-section spline lines on the second reference plane through the projection point and the reflection point, where n is greater than or equal to 2; S24: Stretch the first reference surface along the end away from the second reference surface to generate a support surface; S25: Generate the parametric surface based on the support surface, the first section spline, and the second section spline.

6. The dynamic test method for the vehicle head-up display system and windshield as described in any one of claims 1 to 5, characterized in that, Methods for determining whether the parametric surface meets the optical requirements include: bandwidth verification, curvature verification, and main optical axis verification of the vehicle head-up display system.

7. The dynamic testing method for the vehicle head-up display system and windshield as described in claim 6, characterized in that, The bandwidth verification method includes: S31: Arrange multiple checkpoints on the parameterized surface; S32: Determine whether the bandwidth value meets the requirements, and check whether the bandwidth value is less than a set threshold; wherein the bandwidth value is the difference between the parameterized surface and the windshield range, and the set threshold is 5mm; If not, adjust the number of checkpoints or the threshold, and repeat step S32; If so, then perform curvature verification.

8. The dynamic testing method for the vehicle head-up display system and windshield as described in claim 6, characterized in that, The curvature verification includes: S31': Input the main optical axis of the vehicle head-up display system, and generate a tangent plane based on the main optical axis; S32': Based on the size of the cutting plane, project it onto the parametric surface to determine the inspection area, and at the same time generate multiple cross-sectional lines and multiple longitudinal cross-sectional lines of the vehicle head-up display area; S33': Measure fixed points Ry and Rz on the cross-section line with fixed step sizes; S34': Determine whether Ry and Rz meet the requirements; If not, set the parameters for the tangent plane and section line and repeat the above steps; if yes, then perform a main optical axis check for the vehicle head-up display system.

9. The dynamic testing method for the vehicle head-up display system and windshield as described in claim 6, characterized in that, The main optical axis calibration of the vehicle head-up display system includes: S31'': Input eye point and parameterized surface, and generate another head-up display system main optical axis for comparison based on the eye point and the parameterized surface; S32'': Measure the angle difference between the main optical axis of the other head-up display system and the main optical axis of the input head-up display system, and determine whether the angle difference is less than a set threshold; If yes, record the angle difference; otherwise, set the optical path parameters and repeat the above steps.

10. The dynamic testing method for the vehicle head-up display system and windshield as described in any one of claims 1 to 5, characterized in that, After conducting multiple tests using the method described above, the parameters of multiple parameterized surfaces, as well as the incident and reflected light paths of multiple vehicle head-up display systems, the light paths before the test, and the angle adjustment amounts of the light paths obtained during the test are output.

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