Method for checking blind area of wide-body box truck outside rearview mirror

Abstract

The application discloses a rearview mirror field of view checking method for a commercial vehicle with a side handrail cargo compartment, and steps include: establishing a checking model containing a cab, a side handrail cargo compartment, a rearview mirror and an empty / full load ground line, creating an eye ellipse and a spherical rearview mirror model with a rotation parameter; respectively mapping cargo compartment side handrail feature points, regulation area feature points and parallel field of view feature points to the spherical rearview mirror to form a cargo compartment field of view envelope area, a regulation visible area and a parallel field of view visible area; comparing the three types of field of view areas, adjusting the rearview mirror surface angle or position to make the cargo compartment field of view fully contained; repeatedly checking through straight-line driving, right turning and slope driving multi-working conditions. The application realizes accurate coverage of the field of view blind area caused by the cargo compartment ultra-wide and the side handrail through spherical mapping and multi-field of view collaborative checking, ensures that the checking result meets the regulation requirements and adapts to the actual driving scene, and provides a reliable basis for the rearview mirror optimization design.

Description

Technical Field

[0001] This invention belongs to the field of automotive safety technology. Specifically, this invention relates to a method for verifying the blind spot of the exterior rearview mirror of a wide-body cargo vehicle. Background Technology

[0002] Many existing technologies only verify the legal visibility of vehicles without cargo boxes, focusing solely on the rearward visibility as per regulations. They neglect special vehicle types, such as commercial vehicles with superstructures or added cargo boxes. Because the height of the cargo box and the width with side grab handles significantly exceed the driver's cab, traditional rearview mirrors cannot cover the rear and sides of the cargo box, creating a blind spot extending from the end of the cargo box to the end of the driver's cab. Wide-body cargo boxes, such as micro-trucks, often have their cargo boxes widened or have side grab handles added, obstructing the driver's view of the rear and top of the cargo box, leading to driver complaints. The unconventional design of the cargo box height and ground clearance means that traditional rearview mirrors cannot reflect light to cover the top and rear of the cargo box, posing a driving safety hazard.

[0003] Existing verification methods are limited to regulatory verification and cannot identify issues such as excessive width on the right side. For example, patent document CN102848978A discloses a CATIA-based method for verifying the rear view of a vehicle. This method is only implemented for the rear view of the vehicle in accordance with GB15084 regulations (i.e., regulatory ground line verification). It only verifies the view area that meets the regulatory requirements. Although it clearly defines the regulatory view boundary standards, it does not verify the area outside the regulatory view. It is not suitable for high-roof and wide-body cargo box vehicles, especially cargo boxes with side-opening handrails. The driver cannot see the rear view of the cargo box beyond the handrail, resulting in blind spots when reversing and turning to the side.

[0004] This paper provides a method for calibrating the blind spot of the exterior rearview mirrors of wide-body cargo box vehicles, particularly regarding how to accurately calibrate the field of vision of vehicles with side-opening door handles. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a method for calibrating the blind spot of the exterior rearview mirrors of wide-body cargo box vehicles, with the purpose of achieving accurate calibration of the field of vision for vehicles with side-opening door handles.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for verifying the blind spot of the exterior rearview mirror of a wide-body cargo box vehicle, comprising the following steps: S1. Establish the verification model: Import the 3D data of the cab, cargo box with side armrests, and rearview mirrors into the 3D modeling software, as well as the ground line models in the empty and fully loaded states; and load the regulatory view boundary template. Extract the curvature lens of the rearview mirror and assemble it onto the rotation axis, and configure the horizontal tilt angle and pitch angle of the lens; Create an eye elliptical surface and corresponding left and right eye points, wherein the eye points include head swing range parameters; Create a rearview mirror surface with rotation angle parameters superimposed sequentially around the X-axis, Y-axis, and Z-axis, and restore the rearview mirror surface to a sphere and its corresponding center according to the radius of curvature; S2. Cargo compartment view mapping: Select feature points on the side handrails of the cargo compartment, connect each feature point with the eye point to form a line, and project the line onto the sphere to obtain multiple projection lines; construct a plane based on each projection line, and draw tangent lines from the center of the sphere, the eye point, and the corresponding feature point to the projection line in the plane to obtain the tangent point of each tangent line, and determine the cargo compartment reflection intersection point based on the tangent point; connect each cargo compartment reflection intersection point to form the cargo compartment view envelope area. S3, Regulatory Visibility Mapping: Based on regulatory standards, create a regulatory region with the minimum field of view. Select feature points of the regulatory region and, following the mapping method in step S2, project the lines connecting each feature point and the eye point onto the sphere to obtain multiple regulatory reflection points. Connect each regulatory reflection point to form a regulatory visible region. S4. Parallel View Mapping: Define a parallel view, wherein the vertical edge of the parallel view is located in the Z direction of the feature point of the regulatory area, the bottom edge is located in the unloaded ground plane, and the height is consistent with the height of the highest point of the exterior rearview mirror from the unloaded ground; according to the mapping method in step S2, obtain the parallel view reflection points, connect each parallel view reflection point to form the parallel view visible area. S5. Field of view comparison and adjustment: Compare the cargo compartment field of view envelope area, the legal visible area and the parallel field of view visible area. Within the lens adjustment angle range, adjust the X-axis, Y-axis and Z-axis rotation angle of the rearview mirror surface or translate it until the cargo compartment field of view envelope area is completely contained within the visible area of ​​the rearview mirror surface. It is determined that the rearview mirror meets the calibration requirements. S6. Multi-condition verification: Create verification scenarios for various typical driving conditions, adjust the ground line, cargo box feature points or eye point parameters under the corresponding conditions, and repeat steps S2 to S5 to complete the full-condition field of view verification.

[0007] In step S1, the eye ellipse is created according to the SAE J941 standard and is the eye ellipse of the 95th percentile male driver; the head swing range parameters are ±15° in the horizontal direction and ±10° in the vertical direction.

[0008] In step S1, the horizontal tilt angle of the lens is 10°~15° outward deflection, and the pitch angle is 5°~10° downward tilt.

[0009] In step S1, the lens adjustment angle range is ±8°.

[0010] In step S2, the feature points of the cargo compartment side handrail include the handrail apex A1 and the handrail bottom point A2; the left and right eye points are H1 and H2 respectively, the handrail apex A1 and eye point H1 form a first line, and the handrail apex A2 and eye point H2 form a second line.

[0011] In step S3, the regulatory standard is GB15084, the size of the regulatory area is at least 2.5m wide × 30m long, and the feature points of the regulatory area are the four corner points of the area.

[0012] In step S5, the comparison and adjustment determination logic includes: If the cargo compartment's field of vision envelope is projected within the legally defined visible area and the parallel field of vision visible area, then the initial position of the lens meets the requirements. If the projection of the cargo compartment's field of vision envelope area is outside the legally defined visible area and the parallel field of vision visible area, then adjusting the mirror angle will meet the requirements. If the cargo compartment's field of vision is projected outside the rearview mirror, adjust the X, Y, and Z axis rotation parameters of the mirror or perform translation until the requirements are met.

[0013] In step S6, the typical driving conditions include: Working condition 1: Straight driving condition, including two states: empty and fully loaded cargo box, adjust the ground line and the characteristic point parameters of the top and bottom of the cargo box; Operating Condition 2: Right Turn Condition, the cargo box deviates 200mm to the right, adjust the feature point parameters of the top and bottom of the cargo box; Operating Condition 3: Slope driving condition, pitch angle ±5°, adjust the parameters of left and right eye points around the Y-axis ±5°.

[0014] The specific method for determining the reflection intersection point of the cargo compartment based on the tangent point is as follows: take the tangent point from the center of the sphere to the projection line, the tangent point from the eye point to the projection line, and the tangent point from the corresponding feature point to the projection line. These three points together determine a reflection intersection point.

[0015] The present invention provides a method for verifying the blind spot of the rearview mirror of a wide-body cargo box vehicle. It innovatively adopts a purely manual operation of CATIA software to accurately verify the field of vision of the rearview mirror of a van with a side-opening door and handrail, solving the problem that the existing technology cannot verify the field of vision design of commercial vehicles such as vans with handrails with a cargo box height of more than 2.2 meters. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the visual envelope boundary line of the cargo compartment; Figure 2 This is a schematic diagram of the boundary line of the regulatory field of view; Figure 3 This is a schematic diagram of the boundary line of the parallel field of view envelope; Figure 4 This is a comparison diagram of the field of view envelope under three working conditions. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] This invention provides a method for verifying the blind spot of the exterior rearview mirrors of wide-body cargo vehicles, including the following steps (with the right exterior rearview mirror as the verification standard): S1. Establish the verification model: Import the 3D data of the cab, cargo box with side armrests, and rearview mirrors, as well as the ground line models of the empty and fully loaded states into the 3D modeling software; and load the regulatory view boundary template; the 3D modeling software is CATIA software; Extract the curvature lens of the rearview mirror and assemble it onto the rotation axis, and configure the horizontal tilt angle and pitch angle of the lens; Create an eye elliptical surface and corresponding left and right eye points, wherein the eye points include head swing range parameters; Create a rearview mirror surface with rotation angle parameters superimposed sequentially around the X-axis, Y-axis, and Z-axis, and restore the rearview mirror surface to a sphere and its corresponding center according to the radius of curvature; S2. Cargo compartment view mapping: Select feature points on the side handrails of the cargo compartment, connect each feature point with the eye point to form a line, and project the line onto the sphere to obtain multiple projection lines; construct a plane based on each projection line, and draw tangent lines from the center of the sphere, the eye point, and the corresponding feature point to the projection line in the plane to obtain the tangent point of each tangent line, and determine the cargo compartment reflection intersection point based on the tangent point; connect each cargo compartment reflection intersection point to form the cargo compartment view envelope area. S3, Regulatory Visibility Mapping: Based on regulatory standards, create a regulatory region with the minimum field of view. Select feature points of the regulatory region and, following the mapping method in step S2, project the lines connecting each feature point and the eye point onto the sphere to obtain multiple regulatory reflection points. Connect each regulatory reflection point to form a regulatory visible region. S4. Parallel View Mapping: Define a parallel view, wherein the vertical edge of the parallel view is located in the Z direction of the feature point of the regulatory area, the bottom edge is located in the unloaded ground plane, and the height is consistent with the height of the highest point of the exterior rearview mirror from the unloaded ground; according to the mapping method in step S2, obtain the parallel view reflection points, connect each parallel view reflection point to form the parallel view visible area. S5. Field of view comparison and adjustment: Compare the cargo compartment field of view envelope area, the legal visible area and the parallel field of view visible area. Within the lens adjustment angle range, adjust the X-axis, Y-axis and Z-axis rotation angle of the rearview mirror surface or translate it until the cargo compartment field of view envelope area is completely contained within the visible area of ​​the rearview mirror surface. It is determined that the rearview mirror meets the calibration requirements. S6. Multi-condition verification: Create verification scenarios for various typical driving conditions, adjust the ground line, cargo box feature points or eye point parameters under the corresponding conditions, and repeat steps S2 to S5 to complete the full-condition field of view verification.

[0020] Specifically, in this embodiment of the invention, a manual verification process without formulas or procedures is implemented using traditional CATIA software to solve the blind spot problem caused by wide-body vans and improve driving safety.

[0021] For vans equipped with side-opening door handles, the driver cannot see the rear of the van beyond the handle, creating blind spots when reversing and turning sideways. Therefore, in this embodiment of the invention, a customized verification process is required for the non-standard characteristics of wide-body vans. Blind spots in the van's visibility are addressed using 3D modeling (such as CATIA parametric modeling), allowing the driver to easily view the rear of the van and resolving customer complaints.

[0022] In step S1 above, the eye ellipse is created according to the SAE J941 standard and is the eye ellipse of the 95th percentile male driver; the head swing range parameters are ±15° in the horizontal direction and ±10° in the vertical direction.

[0023] In step S1 above, the horizontal tilt angle of the lens is 10°~15° outward deflection, and the pitch angle is 5°~10° downward tilt.

[0024] In step S1 above, the lens adjustment angle range is ±8°.

[0025] In this embodiment of the invention, step S1 specifically includes: 1. Import data for the cab, cargo box (marking the oversized portion), rearview mirrors, and side handrails into the assembly module of CATIA software. Import dynamic parameters for the ground line model under both unloaded and fully loaded states (the key factor affecting the height of point H). 2. Load the regulatory field of view boundary template (e.g., the N2 area 4m×1m and 20m×4m or 30m×5m behind the driver's side eye point). 3. Extract the rearview mirror curvature lens from the generative shape design module in CATIA software, and assemble the rearview mirror lens onto the folding or rotating axis, ensuring that the angle between the center point of the mirror and the eye point meets the requirements: Horizontal tilt angle setting: Rotate the lens outward with the lens rotation axis as the rotation center, and the lens deflection angle is 10°~15° (covering the extra-wide area of ​​the cargo box). Pitch angle setting: Rotate the lens downwards, and the lens tilt angle is 5°~10° (for observing the top of the cargo compartment and the near-ground blind zone). 4. Manually create the eye ellipse surface according to the SAE J941 standard. Manually draw the eye ellipse of the 95th percentile male driver in the generative shape design module of CATIA software. Simulate the swing range of the head in the horizontal direction ±15° and the vertical direction ±10° by rotation operation, and establish the left and right eye points H1 and H2 with parameters. 5. In the generative shape design module of CATIA software, draw the rearview mirror surface centroid G rotating around the X, Y, and Z directions respectively, and create rearview mirror surfaces (X1, Y1, Z1) with rotation angle parameters superimposed in sequence. The rearview mirror surface (Z1) with parameters is restored to a sphere and the center of the sphere P1 according to the radius of curvature of the mirror surface.

[0026] In step S2 above, the feature points of the cargo compartment side handrail include the handrail apex A1 and the handrail bottom point A2; the left and right eye points are H1 and H2 respectively, the handrail apex A1 and eye point H1 form a first line, and the handrail apex A2 and eye point H2 form a second line.

[0027] In this embodiment of the invention, step S2 specifically includes: 1. Connect the vertex A1 of the side door handle of the cargo compartment to the eye point H1 to generate the first line line1. Use the "Project" tool of CATIA software to project the first line line1 onto the sphere to obtain the first projection line. Use the first projection line as the first plane. Then, use the first plane as the reference and use the "Sketch" tool of CATIA software to draw the tangent line from the center of the sphere P1 to the first projection line to obtain the tangent point B1. Draw the tangent line from the eye point to the first projection line to obtain the tangent point B2. Then draw the tangent line from the vertex A1 of the side door handle of the cargo compartment to the first projection line to obtain the tangent point B3. Take the tangent points B1, B2 and B3 to obtain the cargo compartment reflection intersection point S1. 2. Connect the bottom point A2 of the cargo compartment side door handle and the eye point H2 to generate the second line line2. Use the "Project" tool of CATIA software to project the second line line2 onto the sphere to obtain the second projection line. Use the second projection line to make the second plane. Then, use the second plane as the reference to use the "Sketch" tool of CATIA software to make the tangent line from the center of the sphere P1 to the second projection line to obtain the tangent point C1. Make the tangent line from the eye point to the second projection line to obtain the tangent point C2. Then, make the tangent line from the bottom point A2 of the cargo compartment side handle to the second projection line to obtain the tangent point C3. Take the tangent points C1, C2, and C3 to obtain the cargo compartment reflection intersection point S2. 3. In the freeform surface module of CATIA software, connect the reflection intersections S1 and S2 of the cargo compartment to generate the cargo compartment's field of view envelope region W1.

[0028] In step S3 above, the regulatory standard is GB15084, the size of the regulatory area is at least 2.5m wide × 30m long, and the characteristic points of the regulatory area are the four corner points of the area.

[0029] In this embodiment of the invention, step S3 specifically includes: 1. Create the regulatory field of view (RCD) based on the full-load ground line sketch command, defining the minimum field of view required by GB 15084 (example: the main and exterior rearview mirrors must cover an area at least 2.5m wide × 30m long). Take four coordinate points P2, P3, P4, and P5 of the RCD and generate regulatory reflection points P6, P7, P8, and P9 on the rearview mirror's curvature hemisphere. The verification process is the same as in step two. Connect the four coordinate points P2, P3, P4, and P5 with the eye point H1 to generate the second line (line2), the third line (line3), the fourth line (line4), and the fifth line (line5). Use the "Projection" function in CATIA software. The tool projects the second line (line2), the third line (line3), the fourth line (line4), and the fifth line (line5) onto the sphere, obtaining the second projection line, the third projection line, the fourth projection line, and the fifth projection line respectively. Using the second projection line, the third projection line, the fourth projection line, and the fifth projection line respectively, the first plane is constructed. Then, using the first plane as a reference, the "Sketch" tool is used to construct the tangent lines from the center of the sphere P1 to the second projection line, the third projection line, the fourth projection line, and the fifth projection line, obtaining the tangent points D1, D2, D3, and D4, and obtaining the cargo compartment reflection intersection point S1. 2. Obtain multiple regulatory reflection points P6, P7, P8, and P9 formed on the rearview mirror surface Z1 with parameters in the regulatory visibility area. Connect the regulatory reflection points to form a closed area W2, which is the regulatory visibility area.

[0030] In this embodiment of the invention, step S4 specifically includes: 1. The parallel field of view is set with the vertical edge of the side closest to the longitudinal center plane of the vehicle located in the Z direction of the coordinate point P10 in the regulatory area, and the bottom edge located on the unloaded ground plane. The height is the same as the height of the highest point of the exterior rearview mirror from the unloaded ground, so as to ensure that you can still see infinity after viewing the regulatory field of view area. 2. Following step S3, connect the parallel field of view reflection point P11, and connect the standard reflection points P12 and P13 to generate the parallel field of view visible area W3.

[0031] In step S4 above, the feature point-eye point-spherical reflection method of step S3 (regulatory view mapping) is reused to map the boundary points of the parallel view area onto the sphere, forming a closed parallel view area W3, ensuring that the generation logic of views W1, W2, and W3 is consistent. The regulatory view W2 focuses on near-medium distance, the cargo compartment view W1 focuses on near distance (the cargo compartment itself), and W3 specifically covers the far distance to infinity. The three combine to form a complete near-medium-far view chain, adapting to actual driving scenarios.

[0032] In step S5 above, the judgment logic for comparison and adjustment includes: If the cargo compartment's field of vision envelope is projected within the legally defined visible area and the parallel field of vision visible area, then the initial position of the lens meets the requirements. If the projection of the cargo compartment's field of vision envelope area is outside the legally defined visible area and the parallel field of vision visible area, then adjusting the mirror angle will meet the requirements. If the cargo compartment's field of vision is projected outside the rearview mirror, adjust the X, Y, and Z axis rotation parameters of the mirror or perform translation until the requirements are met.

[0033] In this embodiment of the invention, step S5 specifically includes: 1. Compare the cargo compartment's field of vision envelope W1, the minimum field of vision reflection area W2 required by regulations, and the parallel field of vision reflection area W3. If these conditions are not met, adjust the X, Y, and Z rotation axis angles of the lens within a range of ±8° to determine if the actual lens can fully encompass all three field of vision areas. If so, the actual lens is deemed to meet the regulations and cargo compartment's field of vision requirements, and whether the rear and top of the cargo compartment can be seen through the side handrail. Generally, three states exist: 1) If the cargo compartment's field of view envelope W1 is projected within the area of ​​the legally required visible area W2 and the parallel field of view visible area W3, it means that the mirror can see the rear of the cargo compartment from its initial position. 2) If the projection of the cargo compartment's field of vision envelope W1 is outside the area of ​​the legally required visible area W2 and the parallel field of vision visible area W3, it means that the mirror Z1 needs to be adjusted to the rear position of the cargo compartment. 3) If the projection of the cargo compartment's field of view envelope area W1 is outside the mirror Z1, then in the CATIA software, adjust the rotation parameters of the mirror Z1 around the X, Y, and Z axes, or perform a translation, and observe the corresponding changes in the projection position of the cargo compartment's field of view envelope area W1, until the projection of the cargo compartment's field of view envelope area W1 in the mirror meets the requirements. Figure 4 Up to the requirement, the cargo compartment's field of vision envelope area W1 is completely contained within the effective reflection area of ​​the mirror Z1, and the verification is complete.

[0034] 2. The cargo box height is generally ≥2200mm. For example, the patent CN102848978A mentions that "the height h of the small triangle and the large triangle represents the height of the visible object within the rear field of vision of the vehicle, preferably h≥1035mm," which does not conform to the cargo box height. Furthermore, it does not compare the three types of cargo box projected field of vision with the legally stipulated field of vision location area.

[0035] In step S6 above, typical driving conditions include: Working condition 1: Straight driving condition, including two states: empty and fully loaded cargo box, after adjusting the ground line and the characteristic point parameters of the top and bottom of the cargo box; Operating Condition 2: Right Turn Condition, the cargo box deviates 200mm to the right, adjust the feature point parameters of the top and bottom of the cargo box; Operating Condition 3: Slope driving condition, pitch angle ±5°, adjust the parameters of left and right eye points around the Y-axis ±5°.

[0036] The specific method for determining the reflection intersection point of the cargo compartment based on the tangent point is as follows: take the tangent point from the center of the sphere to the projection line, the tangent point from the eye point to the projection line, and the tangent point from the corresponding feature point to the projection line. These three points together determine a reflection intersection point.

[0037] In this embodiment of the invention, for condition 1, straight-line driving is the most common condition. The difference between unloaded and fully loaded conditions lies in the change in H-point height caused by suspension compression (when fully loaded, the vehicle body sinks, and the H-point decreases), which in turn affects the eye position and field of vision. The purpose of the verification is to ensure that the long-distance field of vision is not missed when unloaded and that the bottom of the cargo box and the near-ground blind spot are not lost when fully loaded. In the CATIA software, for both fully loaded and unloaded conditions, the ground line parameters and the parameters of the top and bottom P points of the cargo box are adjusted respectively. Then, steps S2-S5 are repeated to regenerate the cargo box field of vision envelope W1, the legally visible area W2, and the parallel field of vision area W3 for the corresponding conditions, and the verification is performed.

[0038] When a commercial vehicle turns right, the cargo box will shift to the right relative to the cab due to centrifugal force (this shift is more pronounced in wide-body cargo boxes), potentially causing the extra-wide portion of the cargo box to exceed the initial field of vision. The purpose of this verification is to ensure that the rear of the cargo box and the side handrail can still be observed through the rearview mirror when turning, avoiding the expansion of blind spots due to the shift. In this embodiment of the invention, for condition 2, the cargo box is shifted to the right (positive Y-axis direction) relative to the cab by 200mm, while the positions of the cab, rearview mirror, and eye ellipse remain unchanged (simulating the relative shift between the cab and the cargo box when a real vehicle turns). In the CATIA software, the parameters of the top and bottom points P of the cargo box are adjusted, changing the parameter value from 0 to 200, i.e., inputting an offset of 200mm. Steps S2-S5 are repeated to regenerate the cargo box field of vision envelope W1, the legally visible area W2, and the parallel field of vision visible area W3 under the corresponding condition for verification.

[0039] When driving on a slope, the vehicle body will experience a pitch angle (the front of the vehicle rises when going uphill, such as a pitch angle of +5°; the front of the vehicle sinks when going downhill, with a pitch angle of -5°), causing the driver's eye point to swing with the vehicle body's tilt, thus affecting the field of vision. The purpose of verification is to ensure that the near-ground blind spot (downhill) and the top of the cargo box (uphill) can still be effectively observed when driving on a slope. In this embodiment of the invention, for working condition 3, the vehicle body pitch angle is adjusted, the left and right eye point parameter areas are adjusted, and the field of vision area is confirmed. When going uphill, the vehicle body rotates 5° (+5°) around the positive X-axis, and when going downhill, it rotates 5° (-5°) around the negative X-axis. The driver's head swings synchronously with the vehicle body pitch. The left and right eye points (H1, H2) are adjusted around the Y-axis by ±5° as required (the Y-axis is the lateral direction of the entire vehicle; rotation around the Y-axis simulates the back-and-forth swing of the head to match the vehicle body pitch). The cargo box field of vision envelope area W1, the legally visible area W2, and the parallel field of vision visible area W3 under the corresponding working condition are regenerated and verified.

[0040] This invention discloses a method for verifying the field of vision of rearview mirrors in commercial vehicles with side-opening armrests and cargo boxes, belonging to the field of automotive design technology. This method innovatively employs purely manual operation of CATIA software to achieve accurate verification of the field of vision for rearview mirrors in vans with side-opening armrests, solving the problem of field of vision design verification for commercial vehicles such as vans with armrests and cargo box heights exceeding 2.2 meters. This method has the following technical advantages: 1. It fills the market gap in the verification of commercial vehicles such as vans with side-opening doors and handrails; 2. A complete manual verification process system has been established, supplementing the verification system for vans and trucks. From the establishment of the reference coordinate system to the final field of view verification, the entire process only requires the use of basic CATIA module functions. 3. A unique dynamic eye-point simulation technology was developed, which can realistically reproduce the driver's actual observation behavior by manually adjusting the position and angle of the eye ellipse; 4. By innovatively utilizing CATIA's reflection and projection functions, it has achieved accurate simulation of the optical characteristics of complex curved mirrors by combining multiple field of view areas (cargo side view and regulatory rear view); 5. A multi-condition overlay analysis method is proposed, which can simultaneously verify the compliance of vision under various driving conditions such as straight driving, turning, and slope.

[0041] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for verifying the blind spot of the exterior rearview mirrors of wide-body cargo box vehicles, characterized in that, Includes the following steps: S1. Establish the verification model: Import the 3D data of the cab, cargo box with side armrests, and rearview mirrors into the 3D modeling software, as well as the ground line models in the empty and fully loaded states; and load the regulatory view boundary template. Extract the curvature lens of the rearview mirror and assemble it onto the rotation axis, and configure the horizontal tilt angle and pitch angle of the lens; Create an eye elliptical surface and corresponding left and right eye points, wherein the eye points include head swing range parameters; Create a rearview mirror surface with rotation angle parameters superimposed sequentially around the X-axis, Y-axis, and Z-axis, and restore the rearview mirror surface to a sphere and its corresponding center according to the radius of curvature; S2, Cargo compartment view mapping: Select feature points on the side handrail of the cargo compartment, connect each feature point with the eye point to form a line, and project the line onto the sphere to obtain multiple projection lines; construct a plane based on each projection line, and draw tangent lines from the center of the sphere, the eye point, and the corresponding feature point to the projection line in the plane, obtain the tangent point of each tangent line, and determine the cargo compartment reflection intersection point based on the tangent point; Connect the reflection points of each cargo compartment to form the cargo compartment's field of vision envelope area; S3, Regulatory Field of View Mapping: Based on regulatory standards, create a regulatory region with the minimum field of view, select feature points of the regulatory region, and project the lines connecting each feature point and the eye point onto the sphere according to the mapping method in step S2 to obtain multiple regulatory reflection points; Connect the various regulatory reflection points to form a regulatory visible area; S4. Parallel View Mapping: Define a parallel view, wherein the vertical edge of the parallel view is located in the Z direction of the feature point of the regulatory area, the bottom edge is located in the unloaded ground plane, and the height is consistent with the height of the highest point of the exterior rearview mirror from the unloaded ground; according to the mapping method in step S2, obtain the parallel view reflection points, connect each parallel view reflection point to form the parallel view visible area. S5. Field of view comparison and adjustment: Compare the cargo compartment field of view envelope area, the legal visible area and the parallel field of view visible area. Within the lens adjustment angle range, adjust the X-axis, Y-axis and Z-axis rotation angle of the rearview mirror surface or translate it until the cargo compartment field of view envelope area is completely contained within the visible area of ​​the rearview mirror surface. It is determined that the rearview mirror meets the calibration requirements. S6. Multi-condition verification: Create verification scenarios for various typical driving conditions, adjust the ground line, cargo box feature points or eye point parameters under the corresponding conditions, and repeat steps S2 to S5 to complete the full-condition field of view verification.

2. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to claim 1, characterized in that, In step S1, the eye ellipse is created according to the SAE J941 standard and is the eye ellipse of the 95th percentile male driver; the head swing range parameters are ±15° in the horizontal direction and ±10° in the vertical direction.

3. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to claim 1, characterized in that, In step S1, the horizontal tilt angle of the lens is 10°~15° outward deflection, and the pitch angle is 5°~10° downward tilt.

4. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to any one of claims 1 to 3, characterized in that, In step S1, the lens adjustment angle range is ±8°.

5. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to any one of claims 1 to 3, characterized in that, In step S2, the feature points of the cargo compartment side handrail include the handrail apex A1 and the handrail bottom point A2; the left and right eye points are H1 and H2 respectively, the handrail apex A1 and eye point H1 form a first line, and the handrail apex A2 and eye point H2 form a second line.

6. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to any one of claims 1 to 3, characterized in that, In step S3, the regulatory standard is GB15084, the size of the regulatory area is at least 2.5m wide × 30m long, and the feature points of the regulatory area are the four corner points of the area.

7. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to any one of claims 1 to 3, characterized in that, In step S5, the comparison and adjustment determination logic includes: If the cargo compartment's field of vision envelope is projected within the legally defined visible area and the parallel field of vision visible area, then the initial position of the lens meets the requirements. If the projection of the cargo compartment's field of vision envelope area is outside the legally defined visible area and the parallel field of vision visible area, then adjusting the mirror angle will meet the requirements. If the cargo compartment's field of vision is projected outside the rearview mirror, adjust the X, Y, and Z axis rotation parameters of the mirror or perform translation until the requirements are met.

8. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to any one of claims 1 to 3, characterized in that, In step S6, the typical driving conditions include: Working condition 1: Straight driving condition, including two states: empty and fully loaded cargo box, adjust the ground line and the characteristic point parameters of the top and bottom of the cargo box; Operating Condition 2: Right Turn Condition, the cargo box deviates 200mm to the right, adjust the feature point parameters of the top and bottom of the cargo box; Operating Condition 3: Slope driving condition, pitch angle ±5°, adjust the parameters of left and right eye points around the Y-axis ±5°.

9. The method for verifying the field of view of a rearview mirror in a commercial vehicle with a side armrest cargo box according to any one of claims 1 to 3, characterized in that, The specific method for determining the reflection intersection point of the cargo compartment based on the tangent point is as follows: take the tangent point from the center of the sphere to the projection line, the tangent point from the eye point to the projection line, and the tangent point from the corresponding feature point to the projection line. These three points together determine a reflection intersection point.

Images