A method and apparatus for determining vehicle access and exit boundaries

Abstract

This application provides a method and apparatus for determining vehicle accessibility boundaries. It acquires the boundary surfaces of the front sill, front door opening, rear sill, and rear door opening. It imports styling CAS data or point cloud data into the vehicle coordinate system, and imports conceptual cross-sections of the top area of ​​the door opening, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, and the C-pillar and sill areas into the door seam area. This generates initial three-dimensional door opening boundaries, which are then compared. If all initial three-dimensional door opening boundaries are larger than the boundary surfaces of the front sill, front door opening, rear sill, and rear door opening, then the door seam area conforms to the vehicle accessibility boundary; otherwise, it does not. This application utilizes parametric design, allowing the accessibility boundary surfaces to change according to variations in the vehicle's hard point parameters, enabling accessibility design verification for different models on the same platform.

Description

Technical Field

[0001] This application relates to the field of vehicle development technology, specifically to a method and apparatus for determining vehicle access and exit boundaries. Background Technology

[0002] Vehicle accessibility refers to the ease with which the driver and passengers can get in and out of the vehicle. Ease of vehicle accessibility is an important aspect of automotive ergonomics, and the quality of its design directly impacts the customer's experience when getting in and out of the vehicle.

[0003] In the concept design phase of a new vehicle model, accessibility targets are typically set based on indicators of ease of entry and exit, and benchmarking against competitors. Statistical analysis of competitor benchmarking parameters is then used to determine accessibility target parameters. Accessibility design is influenced by numerous factors, including the overall ergonomic layout, door opening design, A-pillar angle, B-pillar position, roof and door sill height, and steering wheel and seat positions. Changes in the overall vehicle shape and dimensions will affect these factors, necessitating repeated design and verification of accessibility boundaries. If accessibility issues are only discovered during model evaluation in the later stages of styling, it will increase overall vehicle costs and impact project development timelines.

[0004] While prior art 1 (CN108639190A) discloses a design method for the stopping edge of a vehicle doorway, specifically disclosing the import of automotive styling data and influencing factor data into CAD; establishing a projection line sketch in the side view and creating a curve to simulate the X-Flansch projection; adjusting the projection to a first projection line according to assembly requirements; importing glass surface offset data and headroom concept sections to create a first concept surface; importing a concept section for ease of exiting the vehicle, and creating a second concept surface according to the X-Flansch process requirements and the bottom stop of the glass; importing hinge concept sections and footwell concept sections of the A, B, and C pillars respectively to create a third concept surface; connecting the first, second, and third concept surfaces to form a base surface; projecting the first projection line onto the base surface, offsetting and cutting according to the X-Flansch length to obtain the concept X-Flansch, prior art 1 cannot adapt to changes in the hard point parameters of the entire vehicle, and cannot achieve accessibility design verification for different models on the same platform.

[0005] Therefore, for vehicles developed from scratch, it is crucial to determine the key hard points of the vehicle during the concept design phase and to parametrically design the vehicle's access and exit boundaries based on these key hard points, so as to avoid iterative design and prevent access and exit issues from being discovered only in the later stages of styling. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, this application provides a method and apparatus for determining vehicle access boundaries to solve the above-mentioned technical problems.

[0007] This application provides a method for determining vehicle access and exit boundaries, the method comprising the following steps:

[0008] Obtain the front door sill boundary surface, the front door opening stop boundary surface, the rear door sill boundary surface, and the rear door opening stop boundary surface.

[0009] Establish a vehicle coordinate system, and import the styling CAS data or point cloud data into the vehicle coordinate system. Also, import the conceptual cross-section of the top area of ​​the door opening, the conceptual cross-section of the lower area of ​​the A-pillar, the conceptual cross-section of the upper and lower areas of the B-pillar, the C-pillar area and the sill area into the styling door seam area to generate the initial three-dimensional door opening edge.

[0010] The initial three-dimensional door opening stop edge is generated based on the initial three-dimensional door opening stop edge, and compared with the obtained front threshold boundary surface, front door opening stop boundary surface, rear threshold boundary surface and rear door opening stop boundary surface respectively.

[0011] When the initial three-dimensional door opening boundary is greater than the obtained front sill boundary, front door opening boundary, rear sill boundary, and rear door opening boundary, the door seam area is determined to conform to the vehicle access boundary; otherwise, the door seam area is determined to not conform to the vehicle access boundary, and the door seam area is adjusted or the door opening concept section is changed.

[0012] In one embodiment of this application, the process of obtaining the front door sill boundary surface and the front door opening stop boundary surface includes:

[0013] Based on the driver's seat reference point coordinates and heel point coordinates, and combined with the vehicle's width dimensions and sill location cross-section, the front passenger entry depth dimension boundary is determined; and combined with the vehicle's ground line boundary, the sill height is determined, and the front sill boundary surface is generated; and,

[0014] Based on the coordinates of the driver's seat reference point, the A-pillar stop boundary surface, the upper edge stop boundary surface of the front door frame, and the front edge stop boundary surface of the B-pillar are determined to obtain the front door opening stop boundary surface.

[0015] In one embodiment of this application, the process of obtaining the rear door sill boundary surface and the rear door opening stop boundary surface includes:

[0016] The rear threshold boundary surface is determined based on the first distance position in front of the X coordinate of point R in the rear row; and...

[0017] The upper boundary of the rear door opening is determined based on the Z-direction height from point R of the rear row to the upper edge of the rear door frame stop; and...

[0018] The C-pillar front edge stop boundary is determined based on the minimum distance from the second distance position R of the rear row to the front end of the C-pillar.

[0019] In one embodiment of this application, before obtaining the front sill boundary surface, the front door opening stop boundary surface, the rear sill boundary surface, and the rear door opening stop boundary surface, the method further includes:

[0020] Based on the vehicle tire selection, vehicle wheelbase parameters, and axle and wheel load parameters under different loads, the vehicle ground line boundary is generated; and...

[0021] Based on the overall vehicle product definition dimensions and model body requirements, determine the coordinates of the driver's seat reference point, foot pedal point, front seat height, rear seat R point coordinates, and rear seat height.

[0022] In one embodiment of this application, the method further includes: determining the X coordinate of the driver's seat reference point based on the foot pedal coordinates and the front seat height;

[0023] Let L99-1 be the distance in the X direction from the driver's seat reference point to the foot pedal point. The formula for calculating L99-1 is:

[0024] L99-1=913.+0.672316X(H30-1)-0.00195530X(H30-1) 2

[0025] In the formula, H30-1 represents the front row seat height.

[0026] In one embodiment of this application, before determining the depth dimension boundary of the front row of the vehicle, the method further includes:

[0027] Generate the coordinates of the steering wheel center point based on the coordinates of the driver's seat reference point and the foot pedal point;

[0028] The minimum distance (H74) from the steering wheel to the front seat is determined based on the center point position and steering wheel size, thus obtaining the front edge boundary of the front seat.

[0029] In one embodiment of this application, when generating the coordinates of the steering wheel center point based on the coordinates of the driver's seat reference point and the foot pedal point, the distance from the steering wheel center point to the foot pedal point in the X direction is denoted as Wx. The formula for calculating Wx is:

[0030] Wx=640.1–0.10325*(H30-1)–0.0005*(H30-1)2;

[0031] In the formula, H30-1 represents the front row seat height.

[0032] In one embodiment of this application, when generating the steering wheel center point coordinates based on the driver's seat reference point coordinates and the foot pedal coordinates, the distance from the steering wheel center point to the heel point in the Z direction is denoted as Wz. The formula for calculating Wz is:

[0033] Wz = 405.17 + 0.8715 * (H30 - 1);

[0034] In the formula, H30-1 represents the front row seat height.

[0035] In one embodiment of this application, the depth of the front row of the vehicle is denoted as W18, and W18≤604-0.275*H130; where H130 represents the height of the door sill from the ground.

[0036] This application also provides a vehicle access boundary determination device, the device comprising:

[0037] The boundary data acquisition module is used to acquire the boundary surfaces of the front door sill, the front door opening, the rear door sill, and the rear door opening.

[0038] The 3D doorway edge module is used to establish the vehicle coordinate system and import the styling external CAS data or point cloud data into the vehicle coordinate system. It also imports the conceptual cross-section of the top area of ​​the doorway, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, the C-pillar area and the sill area into the styling doorway seam area to generate the initial 3D doorway edge.

[0039] The comparison module is used to generate an initial three-dimensional door opening boundary based on the initial three-dimensional door opening edge, and compare it with the obtained front threshold boundary surface, front door opening boundary surface, rear threshold boundary surface and rear door opening boundary surface respectively.

[0040] The boundary determination module is used to determine that the styling door seam area conforms to the vehicle access boundary when the initial three-dimensional door opening boundary is greater than the obtained front sill boundary, front door opening boundary, rear sill boundary, and rear door opening boundary; otherwise, it determines that the styling door seam area does not conform to the vehicle access boundary, and adjusts the styling door seam area or changes the door opening concept cross-section.

[0041] As described above, this application provides a method and apparatus for determining vehicle access boundaries, which has the following advantages:

[0042] This application first obtains the boundary surfaces of the front sill, the front door opening, the rear sill, and the rear door opening. Then, it establishes a vehicle coordinate system and imports external CAS data or point cloud data into this system. Additionally, it imports conceptual cross-sections of the top area of ​​the door opening, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, and the C-pillar and sill areas into the door seam area, generating an initial three-dimensional door opening edge. Based on these initial three-dimensional door opening edges, an initial three-dimensional door opening edge is generated. The initial three-dimensional door opening boundary is compared with the obtained front sill boundary, front door opening stop boundary, rear sill boundary, and rear door opening stop boundary. If the initial three-dimensional door opening stop boundary is larger than the obtained front sill boundary, front door opening stop boundary, rear sill boundary, and rear door opening stop boundary, then the styling door seam area is determined to conform to the vehicle accessibility boundary; otherwise, the styling door seam area is determined to not conform to the vehicle accessibility boundary, and the styling door seam area is adjusted or the door opening concept section is changed. Therefore, this application, through parametric design, allows the accessibility boundary surface to change according to the changes in the vehicle's hard point parameters, realizing accessibility design verification for different models on the same platform. This allows for early avoidance of accessibility issues during the automotive concept design stage, improving work efficiency. Simultaneously, based on the accessibility boundary and the door opening stop section, this application can quickly determine whether the front and rear door seams, A-pillar tilt angle, roof height, and B-pillar position meet the accessibility design requirements in the early stages of styling.

[0043] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0045] Figure 1 This is a flowchart illustrating a method for determining vehicle access boundaries according to an embodiment of this application.

[0046] Figure 2 This is a diagram showing the layout of the vehicle coordinate system, vehicle ground lines, and key driver hardpoints according to an embodiment of this application.

[0047] Figure 3 A driver's seat front boundary diagram provided for one embodiment of this application, satisfying the human body entry and exit boundary of the 95th percentile male in China;

[0048] Figure 4 A threshold boundary diagram for boarding and alighting of Chinese women at the 5th percentile, provided as an embodiment of this application;

[0049] Figure 5 The front and rear doorway stop boundary surfaces that satisfy the accessibility requirements are provided in one embodiment of this application;

[0050] Figure 6 A three-dimensional door opening stop diagram generated by creating a conceptual cross-section of the door opening area combined with the door seam and door opening region, as provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of the hardware structure of a vehicle access boundary determination device provided in one embodiment of this application. Detailed Implementation

[0052] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0053] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0054] In this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] The term "multiple" in this application refers to two or more.

[0056] In the description of this application, the terms "first," "second," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance or order.

[0057] Additionally, in the embodiments of this application, the term "exemplary" is used to indicate that it is an example, illustration, or description. Any embodiment or implementation described as "exemplary" in this application should not be construed as being more preferred or advantageous than other embodiments or implementations. Rather, the use of the term "exemplary" is intended to present the concept in a specific manner.

[0058] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.

[0059] Figure 1 A schematic flowchart of a vehicle access boundary determination method according to an embodiment of this application is shown. Specifically, in an exemplary embodiment, as follows... Figure 1 As shown, this embodiment provides a method for determining vehicle access and exit boundaries, which includes the following steps:

[0060] Step 1: Determine the vehicle coordinate system, ground line boundary, and key hard points: Based on the vehicle tire selection, wheelbase parameters, and axle and wheel load parameters under different loads, generate the vehicle ground line boundary; determine the driver's seat reference point SGRP-1 coordinates, foot pedal point BOF coordinates, front seat height H30-1, rear passenger R point coordinates, and rear seat height H30-2 based on the vehicle product definition dimensions and vehicle body requirements;

[0061] Step 2: Determine the front seat leading edge boundary: Based on the driver's seat reference point SGRP-1 coordinates and foot pedal point BOF coordinates from Step 1, and using empirical formulas, generate the steering wheel center point SWC coordinates. Based on the steering wheel center point position and steering wheel dimensions, determine the minimum distance H74 from the steering wheel to the front seat, thus defining the front seat leading edge boundary. This allows 95% of Chinese men to enter and exit the seat without touching the steering wheel or steering column.

[0062] Step 3: Determine the front sill boundary and the front door opening boundary: Based on the driver's seat reference point SGRP-1 coordinates and heel point AHP coordinates in Step 1, combined with the vehicle width dimension and sill position cross section, and considering the scenario of 5% of Chinese women getting out of the car, determine the front entry depth W18 dimension boundary. Combined with the vehicle ground line determined in Step 1, determine the sill height H130 from the ground, and then generate the sill boundary.

[0063] Determine the A-pillar stop boundary surface, the front door frame upper edge stop boundary surface, and the B-pillar front edge stop boundary surface. Based on the driver's seat reference point SGRP-1 determined in step 1, construct the A-pillar stop boundary surface, the front door frame upper edge stop boundary surface, and the B-pillar front edge stop boundary surface in the side view. The A-pillar stop boundary surface is determined by the minimum distance H19 from point R (the front row's R point) to the front door along a straight line tilted forward 20°. The front door frame upper edge stop boundary surface is determined by the Z-direction height H11-1 from point R (the front row's R point) to the front edge of the front door frame. The B-pillar front edge stop boundary surface is determined by the minimum distance LRB-1 from point R (the front row's R point) to the front end of the B-pillar.

[0064] Step 4: Determine the rear door sill boundary and the rear door opening stop boundary. Based on the position 330mm ahead of the rear door sill (R point) determined in Step 1, determine the rear door sill boundary. Based on the Z-direction height H11-2 from the rear door sill to the upper edge of the rear door frame stop, determine the upper edge boundary of the rear door opening stop. Based on the minimum distance LRC-1 from the second distance position (R point) at the rear door sill height to the front end of the C-pillar, determine the C-pillar front edge stop boundary. As an example, in this embodiment, the second distance position is 600mm.

[0065] Step 5: Import the styling external CAS data or point cloud data in the vehicle coordinate system. Import the conceptual cross-section of the top area of ​​the door opening, the conceptual cross-section of the lower area of ​​the A-pillar, the conceptual cross-section of the upper and lower areas of the B-pillar, and the conceptual cross-section of the C-pillar and sill areas in the door opening seam area. Derive the door opening stop edges at the corresponding positions based on the conceptual cross-sections. Refer to the door opening seam curve of the styling external CAS and use curved surfaces to smoothly connect the stop edges of each section to create the initial version of the three-dimensional door opening stop edges.

[0066] Step 6: Compare the three-dimensional door opening stop in Step 5 with the stop boundary determined by the hard points of the overall layout in Steps 3 and 4. If the door opening stop boundaries of the four areas shown in Step 5 are all larger than the door opening stop boundaries in Steps 3 and 4, it indicates that the external door joint area meets the access requirements. Otherwise, it does not meet the access requirements and the position of the door joint needs to be adjusted or the door opening concept section needs to be changed.

[0067] Therefore, this embodiment demonstrates that through parametric design, the access boundary surface can vary according to changes in the vehicle's hard point parameters, enabling access design verification for different models on the same platform. This allows for early avoidance of access issues during the automotive concept design phase, improving work efficiency. Furthermore, based on the access boundary and the cross-sectional view of the door opening stop position, this embodiment can quickly determine whether the front and rear door gaps, A-pillar tilt angle, roof height, and B-pillar position meet access design requirements in the early stages of styling.

[0068] In another exemplary embodiment, the embodiment also provides a method for determining vehicle accessibility boundaries, including the following steps:

[0069] Step S1: Determine the vehicle coordinate system, ground line boundary, and key hard points during the concept design phase.

[0070] S1.1: Parametric Design of Ground Line: Calculate the coordinates of the front and rear wheel center points and the static radius of the tires based on the vehicle axle load parameters and suspension parameters; in the vehicle coordinate system, on the Y0 plane, the tangent lines of the front and rear wheel static radius curves are the ground line; draw the ground lines under no-load and one-person load conditions respectively. Figure 2 As shown.

[0071] S1.2: Seat height H30-1 and front and rear row R points determined:

[0072] Based on vehicle positioning, target vehicle height, and target Z-axis headroom, the front seat height H30-1 is determined according to the overall Z-axis dimensional chain at the front seat R point position. Based on the vehicle length and space targets, combined with the engine compartment layout, front panel position, and pedal arrangement, the L113 value is determined, which is the distance from the BOF point to the X position of the front wheel center. Figure 2 As shown.

[0073] Based on the BOF point and the front row seating height H30-1, and using empirical formulas, determine the X coordinate of the front row R point. The formula for calculating the X-axis distance L99-1 from the front row R point to the BOF point is as follows:

[0074] L99-1=913.+0.672316X(H30-1)-0.00195530X(H30-1) 2 ;

[0075] The Y-coordinate of the front row R-point is determined based on the overall vehicle width dimension and the dimensional chain in the width direction. The X-coordinate of the rear row R-point is determined based on the distance L50-2 between the front and rear R-points.

[0076] Step S2: Based on the driver's seat reference point SGRP-1 coordinates and the foot pedal point BOF coordinates from Step S1, and using empirical formulas, generate the steering wheel center point SWC coordinates. The X-axis dimension Wx of the steering wheel center point distance from the BOF point is calculated using the following empirical formula.

[0077] Wx=640.1–0.10325*(H30-1)–0.0005*(H30-1)2;

[0078] The Z-axis dimension Wz, distance from the center point of the steering wheel to the AHP heel point, is calculated using the following empirical formula:

[0079] Wz = 405.17 + 0.8715 * (H30 - 1);

[0080] Determine the position of the steering wheel based on the position of the center point of the steering wheel, the angle between the axis of the steering wheel and the horizontal direction, and the size of the steering wheel. Further determine the minimum distance H74 from the steering wheel to the front row seat, and determine the front edge boundary of the front row seat. For all vehicles, H74 shall not be less than 150 mm. Ensure that 95% of Chinese male bodies can enter and exit the seat without touching the steering wheel and the steering column, as Figure 3 shown.

[0081] Step S3: Based on the coordinates of the driver seat reference point SGRP-1 and the heel point AHP point coordinates in Step S1, combined with the vehicle width dimension and the cross-section of the sill position, simulate the scenario of a 5% Chinese female getting off the vehicle in CATIA to determine the boundary of the front row entry depth W18 dimension. Combine with the vehicle ground line determined in Step S1 to determine the sill ground clearance H130, and then generate the sill side surface, as Figure 4 shown. Among them, H130 shall not exceed 430 mm, and W18 shall not exceed​​​​​​​​​​​​As shown. The distance from point R in the second row to the upper opening of the C-pillar, LRC-1, is not less than 250mm. This dimension is located 600mm above point R from the Z direction and is measured horizontally. Figure 5 As shown.

[0085] Step S5: Import the styling external CAS data or point cloud data into the vehicle coordinate system. Import the conceptual cross-sections of the top area of ​​the door opening, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, the C-pillar area, and the sill area into the door seam area. Derive the door opening stop edge at the corresponding position based on the conceptual cross-sections, referring to the styling external CAS door seam curve, such as... Figure 6 As shown, the edges of each cross-section are smoothly connected using curved surfaces to create the initial version of the 3D door opening edge. The specific steps are as follows:

[0086] Create the upper stop surface of the front door: Extract the outer CAS side contour guide line, determine the angle between the glass surface and the first flange on the side according to the standard section of the upper section of the window frame, establish the association constraint between the standard section, the first flange surface of the side and the glass, offset the glass surface according to the distance between the stop surface of the section and the glass, and use this surface as the upper preliminary stop surface.

[0087] Combine the CAS door joint, LRA and LRB-1, and the A-pillar section and B-pillar section to create the front and rear end stop surfaces of the front door; combine the CAS door joint and the threshold section boundary to create the lower part of the front door preliminary stop surface; connect the upper, lower, and front and rear part preliminary stop boundary surfaces of the front door smoothly by bridging, and determine the stop boundary according to the section of each area.

[0088] Step S6: Compare the initial 3D doorway stop in Step S5 with the stop boundaries that meet the access requirements determined by the hard points of the overall layout in Steps S3 and S4. If the doorway stop boundaries of the four areas shown in Step S5 are all within the doorway stop boundaries in Steps S3 and S4, it indicates that the doorway stop boundaries derived from the external door joints and conceptual cross-sections meet the access requirements. Otherwise, they do not meet the access requirements, and it is necessary to adjust the door joint area or change the conceptual cross-section.

[0089] Therefore, this embodiment proposes a design method for key hard points and access boundaries of automotive human-machine interfaces during the conceptual design stage. Through CATIA parametric design, the access boundary parameters can vary according to changes in the vehicle's hard points, enabling access boundary design for different models on the same platform. Simultaneously, based on the access boundaries and the cross-section of the door opening position, it is possible to quickly determine whether the front and rear door gaps, A-pillar tilt angle, roof height, and B-pillar position meet access design requirements in the early stages of styling. This embodiment, through parametric design, allows the access boundary surface to change according to changes in the vehicle's hard point parameters, enabling access design verification for different models on the same platform. This allows for early avoidance of access problems during the automotive conceptual design stage, improving work efficiency.

[0090] In another exemplary embodiment of this application, the embodiment also provides a method for determining vehicle accessibility boundaries, including the following steps:

[0091] S100: Obtain the front sill boundary surface, the front door opening stop boundary surface, the rear sill boundary surface, and the rear door opening stop boundary surface. As an example, the process of obtaining the front sill boundary surface and the front door opening stop boundary surface includes: determining the vehicle's front entry depth W18 dimension boundary based on the driver's seat reference point SGRP-1 coordinates and heel point AHP coordinates, combined with the vehicle's width dimension and sill position cross-section; determining the sill height H130 from the ground based on the vehicle's ground line boundary, and generating the front sill boundary surface; and determining the A-pillar stop boundary surface, the front door frame upper edge stop boundary surface, and the B-pillar front edge stop boundary surface based on the driver's seat reference point SGRP-1 coordinates, thus obtaining the front door opening stop boundary surface. As another example, the process of obtaining the rear sill boundary surface and the rear door opening boundary surface includes: determining the rear sill boundary surface based on the first distance position of the X coordinate of the rear R point; determining the upper boundary of the rear door opening based on the Z-direction height H11-2 from the rear R point to the upper edge of the rear door frame; and determining the C-pillar front edge boundary based on the minimum distance LRC-1 from the rear R point's second height position to the front end of the C-pillar. Furthermore, in this embodiment, the front entry depth of the vehicle can be denoted as W18, which must satisfy: W18≤604-0.275*H130; where H130 represents the sill height from the ground. In this embodiment, the first distance is 330mm, and the second distance is 600mm.

[0092] S200, establish the whole vehicle coordinate system, and import the styling external CAS data or point cloud data under the whole vehicle coordinate system, and import the conceptual cross-section of the top area of ​​the door opening, the conceptual cross-section of the lower area of ​​the A-pillar, the conceptual cross-section of the upper and lower areas of the B-pillar, the C-pillar area and the sill area in the styling door seam area to generate the initial three-dimensional door opening stop edge.

[0093] S300, an initial three-dimensional door opening stop boundary is generated based on the initial three-dimensional door opening stop edge, and compared with the obtained front threshold boundary surface, front door opening stop boundary surface, rear threshold boundary surface and rear door opening stop boundary surface respectively.

[0094] S400, when the initial three-dimensional door opening boundary is greater than the obtained front sill boundary, front door opening boundary, rear sill boundary and rear door opening boundary, the door seam area is determined to conform to the vehicle access boundary; otherwise, the door seam area is determined to not conform to the vehicle access boundary, and the door seam area is adjusted or the door opening concept section is changed.

[0095] Therefore, this embodiment demonstrates that through parametric design, the access boundary surface can vary according to changes in the vehicle's hard point parameters, enabling access design verification for different models on the same platform. This allows for early avoidance of access issues during the automotive concept design phase, improving work efficiency. Furthermore, based on the access boundary and the cross-sectional view of the door opening stop position, this embodiment can quickly determine whether the front and rear door gaps, A-pillar tilt angle, roof height, and B-pillar position meet access design requirements in the early stages of styling.

[0096] According to the above description, in an exemplary embodiment, before obtaining the front sill boundary surface, the front door opening boundary surface, the rear sill boundary surface, and the rear door opening boundary surface, the process may further include: generating the vehicle ground line boundary based on the vehicle tire selection, vehicle wheelbase parameters, and vehicle axle load and wheel load parameters under different loads; and determining the driver's seat reference point SGRP-1 coordinates, footrest point BOF coordinates, front seat height H30-1, rear seat R point coordinates, and rear seat height H30-2 based on the vehicle product definition dimensions and vehicle body requirements. This embodiment may also include: determining the front seat R point X coordinate based on the footrest point BOF coordinates and the front seat height H30-1; denoting the distance from the driver's seat reference point to the footrest point in the X direction as L99-1, then the calculation formula for L99-1 is:

[0097] L99-1=913.+0.672316X(H30-1)-0.00195530X(H30-1) 2 ;

[0098] In the formula, H30-1 represents the front row seat height.

[0099] According to the above description, in an exemplary embodiment, before determining the boundary of the vehicle's front seat entry depth W18, the method may further include: generating the steering wheel center point SWC coordinates based on the driver's seat reference point SGRP-1 coordinates and the footrest point BOF coordinates; determining the minimum distance H74 from the steering wheel to the front seat based on the steering wheel center point position and steering wheel size, thus obtaining the front edge boundary of the front seat. As an example, in this embodiment, when generating the steering wheel center point SWC coordinates based on the driver's seat reference point SGRP-1 coordinates and the footrest point BOF coordinates, the dimension of the steering wheel center point from the footrest point in the X direction is denoted as Wx, and the calculation formula for Wx is: Wx=640.1–0.10325*(H30-1)–0.0005*(H30-1)2; where H30-1 represents the front seat height. As another example, in this embodiment, when generating the steering wheel center point SWC coordinates based on the driver's seat reference point SGRP-1 coordinates and the foot pedal point BOF coordinates, the distance from the steering wheel center point to the heel point in the Z direction is denoted as Wz. The formula for calculating Wz is: Wz=405.17+0.8715*(H30-1); where H30-1 represents the front seat height.

[0100] In summary, this application provides a method for determining vehicle access boundaries. First, it acquires the boundary surfaces of the front sill, the front door opening, the rear sill, and the rear door opening. Then, it establishes a vehicle coordinate system and imports external CAS data or point cloud data into this system. Additionally, it imports conceptual cross-sections of the top area of ​​the door opening, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, and the C-pillar and sill areas into the door seam area to generate an initial three-dimensional door opening edge. Based on these initial three-dimensional door opening edges... An initial three-dimensional doorway boundary is generated and compared with the acquired front sill boundary, front doorway boundary, rear sill boundary, and rear doorway boundary. If the initial three-dimensional doorway boundary is larger than all of the acquired front sill boundary, front doorway boundary, rear sill boundary, and rear doorway boundary, then the door seam area is determined to conform to the vehicle accessibility boundary. Conversely, if it is smaller, then the door seam area is determined to not conform to the vehicle accessibility boundary, and the door seam area is adjusted or the doorway concept section is changed. Therefore, this method, through parametric design, allows the accessibility boundary surface to change according to the vehicle's hard point parameters, enabling accessibility design verification for different models on the same platform. This allows for early avoidance of accessibility issues during the automotive concept design stage, improving work efficiency. Meanwhile, based on the accessibility boundary and the cross-section of the doorway stop position, this method can quickly determine whether the front and rear door seams, the A-pillar tilt angle, the roof height, and the B-pillar position meet the accessibility design requirements in the early stages of the design.

[0101] like Figure 7As shown in an exemplary embodiment of this application, a vehicle access boundary determination device is also provided, the device comprising:

[0102] The boundary data acquisition module 710 is used to acquire the boundary surface of the front door sill, the boundary surface of the front door opening, the boundary surface of the rear door sill, and the boundary surface of the rear door opening.

[0103] The 3D doorway edge module 720 is used to establish the vehicle coordinate system, import the styling external CAS data or point cloud data in the vehicle coordinate system, and import the conceptual cross-section of the top area of ​​the doorway, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, the C-pillar area and the sill area in the styling doorway seam area to generate the initial 3D doorway edge.

[0104] The comparison module 730 is used to generate an initial three-dimensional door opening stop boundary based on the initial three-dimensional door opening stop edge, and compare it with the obtained front threshold boundary surface, front door opening stop boundary surface, rear threshold boundary surface and rear door opening stop boundary surface respectively.

[0105] The boundary determination module 740 is used to determine that the styling door seam area conforms to the vehicle access boundary when the initial three-dimensional door opening boundary is greater than the obtained front sill boundary, front door opening boundary, rear sill boundary and rear door opening boundary; otherwise, it determines that the styling door seam area does not conform to the vehicle access boundary, and adjusts the styling door seam area or changes the door opening concept cross section.

[0106] This embodiment provides a vehicle access boundary determination device. First, it acquires the boundary surfaces of the front sill, front door opening, rear sill, and rear door opening. Then, it establishes a vehicle coordinate system and imports styling CAS data or point cloud data into this system. Additionally, it imports conceptual cross-sections of the top area of ​​the door opening, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, and the C-pillar and sill areas into the door seam area, generating an initial three-dimensional door opening edge. Based on these initial three-dimensional door opening edges, it generates... An initial three-dimensional doorway boundary is generated and compared with the acquired front sill boundary, front doorway boundary, rear sill boundary, and rear doorway boundary. If the initial three-dimensional doorway boundary is larger than all of the acquired front sill boundary, front doorway boundary, rear sill boundary, and rear doorway boundary, then the door seam area is determined to conform to the vehicle accessibility boundary. Conversely, if it is smaller, then the door seam area is determined to not conform to the vehicle accessibility boundary, and the door seam area is adjusted or the doorway concept cross-section is changed. Therefore, this device, through parametric design, allows the accessibility boundary surface to change according to the vehicle's hard point parameters, enabling accessibility design verification for different models on the same platform. This allows for early avoidance of accessibility issues during the automotive concept design stage, improving work efficiency. Meanwhile, based on the accessibility boundary and the cross-section of the doorway stop position, this device can quickly determine whether the front and rear door seams, the A-pillar tilt angle, the roof height, and the B-pillar position meet the accessibility design requirements in the early stages of the design.

[0107] It should be noted that the vehicle entry / exit boundary determination device provided in the above embodiments and the vehicle entry / exit boundary determination method provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the vehicle entry / exit boundary determination device provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0108] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for determining vehicle access and exit boundaries, characterized in that, The method includes the following steps: Obtain the front door sill boundary surface, the front door opening stop boundary surface, the rear door sill boundary surface, and the rear door opening stop boundary surface. Establish a vehicle coordinate system, and import the styling CAS data or point cloud data into the vehicle coordinate system. Also, import the conceptual cross-section of the top area of ​​the door opening, the conceptual cross-section of the lower area of ​​the A-pillar, the conceptual cross-section of the upper and lower areas of the B-pillar, the C-pillar area and the sill area into the styling door seam area to generate the initial three-dimensional door opening edge. The initial three-dimensional door opening stop edge is generated based on the initial three-dimensional door opening stop edge, and compared with the obtained front threshold boundary surface, front door opening stop boundary surface, rear threshold boundary surface and rear door opening stop boundary surface respectively. When the initial three-dimensional door opening boundary is greater than the obtained front sill boundary, front door opening boundary, rear sill boundary, and rear door opening boundary, the door seam area is determined to conform to the vehicle access boundary; otherwise, the door seam area is determined to not conform to the vehicle access boundary, and the door seam area is adjusted or the door opening concept section is changed. Before obtaining the boundary surfaces of the front sill, front door opening, rear sill, and rear door opening, the process also includes: generating the vehicle ground line boundary based on the vehicle tire selection, wheelbase parameters, and axle and wheel load parameters under different loads; determining the coordinates of the driver's seat reference point, foot pedal point, front seat height, rear R-point coordinates, and rear seat height based on the vehicle product definition dimensions and model body requirements; and determining the X-coordinate of the driver's seat reference point based on the foot pedal point coordinates and front seat height. The distance from the driver's seat reference point to the foot pedal point in the X direction is denoted as L99-1, and the formula for calculating L99-1 is: L99-1 = 913 + 0.672316 X (H30-1) - 0.00195530 X (H30-1) 2 In the formula, H30-1 represents the front row seat height.

2. The method for determining vehicle access and exit boundaries according to claim 1, characterized in that, The process of obtaining the front door sill boundary surface and the front door opening stop boundary surface includes: Based on the driver's seat reference point coordinates and heel point coordinates, and combined with the vehicle's width dimensions and sill location cross-section, the front passenger entry depth dimension boundary is determined; and combined with the vehicle's ground line boundary, the sill height is determined, and the front sill boundary surface is generated; and, Based on the coordinates of the driver's seat reference point, the A-pillar stop boundary surface, the upper edge stop boundary surface of the front door frame, and the front edge stop boundary surface of the B-pillar are determined to obtain the front door opening stop boundary surface.

3. The method for determining vehicle access and exit boundaries according to claim 2, characterized in that, The process of obtaining the boundary surface of the rear door sill and the boundary surface of the rear door opening includes: The rear threshold boundary surface is determined based on the first distance position in front of the X coordinate of point R in the rear row; and... The upper boundary of the rear door opening is determined based on the Z-direction height from point R of the rear row to the upper edge of the rear door frame stop; and... The C-pillar front edge stop boundary is determined based on the minimum distance from the second distance position R of the rear row to the front end of the C-pillar.

4. The method for determining vehicle access and exit boundaries according to claim 2, characterized in that, Before determining the depth dimension boundary of the front row of the vehicle, the method further includes: Generate the coordinates of the steering wheel center point based on the coordinates of the driver's seat reference point and the foot pedal point; The minimum distance from the steering wheel to the front seat is determined based on the center point position and size of the steering wheel, thus obtaining the front edge boundary of the front seat.

5. The method for determining vehicle access and exit boundaries according to claim 4, characterized in that, When generating the steering wheel center point coordinates based on the driver's seat reference point coordinates and the foot pedal coordinates, the distance from the steering wheel center point to the foot pedal in the X direction is denoted as Wx. The formula for calculating Wx is: Wx = 640.1–0.10325*(H30-1)–0.0005*(H30-1)²; In the formula, H30-1 represents the front row seat height.

6. The method for determining vehicle access and exit boundaries according to claim 4 or 5, characterized in that, When generating the steering wheel center point coordinates based on the driver's seat reference point coordinates and the foot pedal coordinates, the distance from the steering wheel center point to the heel point in the Z direction is denoted as Wz. The formula for calculating Wz is: Wz = 405.17 + 0.8715 * (H30 - 1); In the formula, H30-1 represents the front row seat height.

7. The method for determining vehicle access and exit boundaries according to claim 2, characterized in that, Let the depth of the front row of the vehicle be denoted as W18, and W18≤604-0.275*H130; where H130 represents the height of the door sill from the ground.

8. A vehicle access boundary determination device, characterized in that, The device includes: The boundary data acquisition module is used to acquire the boundary surfaces of the front door sill, the front door opening, the rear door sill, and the rear door opening. The 3D doorway edge module is used to establish the vehicle coordinate system and import the styling external CAS data or point cloud data into the vehicle coordinate system. It also imports the conceptual cross-section of the top area of ​​the doorway, the lower area of ​​the A-pillar, the upper and lower areas of the B-pillar, the C-pillar area and the sill area into the styling doorway seam area to generate the initial 3D doorway edge. The comparison module is used to generate an initial three-dimensional door opening boundary based on the initial three-dimensional door opening edge, and compare it with the obtained front threshold boundary surface, front door opening boundary surface, rear threshold boundary surface and rear door opening boundary surface respectively. The boundary determination module is used to determine that the styling door seam area conforms to the vehicle access boundary when the initial three-dimensional door opening boundary is greater than the obtained front sill boundary, front door opening boundary, rear sill boundary and rear door opening boundary; otherwise, it determines that the styling door seam area does not conform to the vehicle access boundary, and adjusts the styling door seam area or changes the door opening concept cross-section. Before obtaining the boundary surfaces of the front sill, front door opening, rear sill, and rear door opening, the process also includes: generating the vehicle ground line boundary based on the vehicle tire selection, wheelbase parameters, and axle and wheel load parameters under different loads; determining the coordinates of the driver's seat reference point, foot pedal point, front seat height, rear R-point coordinates, and rear seat height based on the vehicle product definition dimensions and model body requirements; and determining the X-coordinate of the driver's seat reference point based on the foot pedal point coordinates and front seat height. The distance from the driver's seat reference point to the foot pedal point in the X direction is denoted as L99-1, and the formula for calculating L99-1 is: L99-1 = 913 + 0.672316 X (H30-1) - 0.00195530 X (H30-1) 2 In the formula, H30-1 represents the front row seat height.

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