Whole vehicle framework main size design method and device based on fixed size group and adjustable size group

Abstract

The invention discloses a whole vehicle framework main size design method and device based on a fixed size group and an adjustable size group, and relates to the technical field of automobile design. The method comprises the following steps: defining a fixed size group and an adjustable size group in a whole vehicle framework; performing dimension chain decomposition on the parts needing dimension chain decomposition in the fixed dimension group, and determining the numerical value of each decomposition dimension based on design requirements; fixed size group parameters are locked, so that the forecabin hard point, the floor structure and the man-machine reference point have universality; dynamically adjusting parameters of the adjustable size group based on vehicle type positioning; and according to the fixed size group parameters and the adjustable size group parameters of the designed parts, through virtual verification and mule car verification, all size chain assignments conform to geometric size compatibility, performance and functional targets, and a main size design result is output. According to the method, the cost can be reduced, and the platform expansibility is good.

Description

Technical Field

[0001] This invention relates to the field of automotive design technology, and in particular to a method and apparatus for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups. Background Technology

[0002] As the automotive industry moves towards platformization and modularization, and with the popularization of new energy vehicles and the increasing demand for personalized products and services, vehicle architecture design faces multiple challenges. In traditional vehicle architecture design, major dimensions such as front overhang and wheelbase are interdependent. Adjusting a single dimension requires re-verification of related systems such as powertrain layout and ergonomics, resulting in a development cycle extension of more than 30% and persistently high R&D costs.

[0003] Platform-based development needs to consider the differentiated requirements of various vehicle types, such as cars, SUVs, and MPVs. However, the fixed size bandwidth in existing technologies is difficult to adapt to the refined requirements of specific vehicle models. For example, the headroom and wheelbase requirements of SUVs differ significantly from those of sedans, and traditional designs struggle to achieve flexible size adjustments while ensuring collision safety and ergonomic comfort.

[0004] In existing related technologies, such as the vehicle length dimension design method proposed in patent CN116561896A, although the dimension design of a specific vehicle model is achieved by dividing the designable dimensions into designable and non-designable dimensions, the core boundary between the fixed dimension group and the adjustable dimension group is not clearly distinguished, nor is the collaborative design logic of the two dimensions established, which cannot support the rapid serialization expansion of multiple vehicle models.

[0005] Furthermore, the increasing integration requirements of new energy vehicles for battery compartments and front cabin spaces necessitate more precise dimensional decoupling control. Simultaneously, users' personalized demands for larger spaces and lower seating positions further necessitate flexible and adjustable dimensional designs. Therefore, there is an urgent need for an architecture master-dimensional design methodology that can balance platform universality with vehicle differentiation, addressing the problems of dimensional coupling, long development cycles, high costs, and insufficient platform scalability inherent in traditional designs. Summary of the Invention

[0006] The technical problem to be solved by the present invention is how to provide a method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups that can reduce costs and has good platform scalability.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups, the method comprising the following steps:

[0009] S1: Defines the fixed-size group and adjustable-size group in the vehicle architecture;

[0010] S2: Perform dimensional chain decomposition on the parts that need to be decomposed in the fixed dimension group, and determine the value of each decomposed dimension based on the design requirements;

[0011] S3: Lock fixed dimension group parameters to make the front cabin hardpoints, floor structure and human-machine reference points universal;

[0012] S4: Dynamically adjust adjustable size group parameters based on vehicle positioning;

[0013] S5: Based on the fixed dimension group parameters and adjustable dimension group parameters of the designed parts, through virtual verification and mule car verification, ensure that the values ​​of each dimension chain meet the geometric dimension compatibility, performance and functional objectives, and output the master dimension design results.

[0014] A further technical solution is that, in step S1:

[0015] The fixed size group includes front overhang distance L104, X-direction distance from the front wheel center to the ball of the foot BOF L113, X-direction distance from the hip point H to the ball of the foot BOF L99, and seating height H30; the adjustable size group includes wheelbase L101, cargo box length L202, seat pitch L50, and headroom H61.

[0016] A further technical solution is that, in step S2:

[0017] The components requiring dimensional chain decomposition include the front overhang L104. The dimensional chain decomposition formula for the front overhang L104 is as follows:

[0018] L104 = L1 + L2 + L3 + L4 + L5 + L6

[0019] Wherein, L1 is the clearance from the anti-collision beam to the front bumper, L2 is the thickness of the anti-collision beam, L3 is the clearance from the anti-collision beam to the radiator, L4 is the thickness of the radiator intercooler, L5 is the clearance from the powertrain to the radiator, and L6 is the distance from the front of the engine to the front wheel center.

[0020] A further technical solution is that, in step S4:

[0021] The adjustable size group is adjusted based on the hard-point cross-sectional geometry, and the parameters of the adjustable size group include:

[0022] When the wheelbase L101 is extended, the cargo box L202 is moved back simultaneously and the seat spacing L50 is expanded. When the headroom H61 is increased, the roof curve is optimized.

[0023] A further technical solution is that, in step S5:

[0024] Virtual verification and mule verification are used to check the compatibility, performance and functional compliance of the dimension chain assignment. If the compliance is not met, the relevant structures or main dimension parameters of the non-main dimension group are adjusted.

[0025] A vehicle architecture master dimension design device based on fixed and adjustable dimension groups, the device comprising:

[0026] Size grouping module: used to define fixed size groups and adjustable size groups in the vehicle architecture;

[0027] Dimension chain decomposition module: Used to decompose the dimensions of components in a fixed dimension group that require dimension chain decomposition, and to determine the values ​​of each decomposed dimension based on design requirements;

[0028] Parameter locking module: used to lock fixed size group parameters, making the front cabin hardpoints, floor structure and human-machine reference points universal;

[0029] Dynamic adjustment module: used to dynamically adjust the parameters of adjustable size groups based on vehicle model positioning;

[0030] Verification module: Based on the fixed and adjustable dimension group parameters of the designed parts, it uses virtual verification and mule cart verification to ensure that the values ​​of each dimension chain meet the geometric compatibility, performance and functional objectives, and outputs the master dimension design results.

[0031] A further technical solution is that the fixed size group includes the front overhang distance L104, the X-direction distance from the front wheel center to the foot point BOF L113, the X-direction distance from the H point to the foot point BOF L99, and the seating height H30.

[0032] The adjustable size group includes wheelbase L101, cargo box length L202, seat pitch L50, and headroom H61.

[0033] A further technical solution involves the following components requiring dimensional chain decomposition: the front overhang L104. The dimensional chain decomposition formula for the front overhang L104 is as follows:

[0034] L104 = L1 + L2 + L3 + L4 + L5 + L6;

[0035] Wherein, L1 is the clearance from the anti-collision beam to the front bumper, L2 is the thickness of the anti-collision beam, L3 is the clearance from the anti-collision beam to the radiator, L4 is the thickness of the radiator intercooler, L5 is the clearance from the powertrain to the radiator, and L6 is the distance from the front of the engine to the front wheel center.

[0036] A further technical solution is that the adjustable size group parameters include:

[0037] When the wheelbase L101 is extended, the cargo box L202 is moved back simultaneously and the seat spacing L50 is expanded. When the headroom H61 is increased, the roof curve is optimized.

[0038] A further technical solution lies in the verification module:

[0039] Virtual verification and mule verification are used to check the compatibility, performance and functional compliance of the dimension chain assignment. If the compliance is not met, the relevant structures or main dimension parameters of the non-main dimension group are adjusted.

[0040] The beneficial effects of adopting the above technical solution are as follows:

[0041] 1) Development efficiency is significantly improved, and the cycle time is greatly shortened:

[0042] Fixed-size groups lock in the front compartment hard points, floor structure, and human-machine interface reference points, avoiding repeated verification of related systems during multi-model development and shortening the development cycle by 30%-50%. Adjustable-size groups are dynamically adjusted based on the hard point cross-sectional geometry, without the need to reconstruct the core architecture. Different models can be quickly derived simply by adapting parameters such as wheelbase and cargo box length (e.g., quickly expanding a sedan into an SUV).

[0043] 2) Effective reduction in R&D and production costs:

[0044] Fixed-size groups enable cross-platform compatibility of core structures such as the front compartment, achieving a parts commonality rate of ≥70%, thus reducing the design, mold making, and production investment of dedicated parts. Dimension chain decomposition and clear grouping rules reduce the rework risk caused by size adjustments, minimize redundant investment in virtual verification and real vehicle testing, and further control R&D costs.

[0045] 3) The platform's scalability and vehicle compatibility have been greatly enhanced:

[0046] The same platform is compatible with the development of multiple vehicle types, including CARs, SUVs, and MPVs. Fixed size groups ensure platform versatility, while adjustable size groups meet the styling differences and functional personalization needs of different vehicle types (such as large headroom in SUVs and low seating position in sedans). It adapts to the integrated requirements of new energy vehicles for battery compartment and front cabin space, balancing space utilization and structural compatibility through precise dimensional decoupling control.

[0047] 4) Dual optimization of product performance and user experience:

[0048] The fixed-size group is designed based on core requirements such as pedestrian protection, collision safety, and thermal management, ensuring stable basic performance shared across multiple models. The adjustable-size group optimizes related structures during adjustments (such as optimizing the roof curve when headroom is increased), meeting individual needs while maintaining key performance indicators such as low wind resistance and good ergonomics.

[0049] 5) Enhanced reliability and engineering feasibility:

[0050] The dual verification process of virtual verification and mule-cart verification ensures that the dimensional chain assignments meet geometric compatibility, performance, and functional goals, reducing mass production risks. Clear dimensional grouping and well-defined parameters facilitate rapid understanding and execution by the engineering team, improving cross-departmental collaboration efficiency and accelerating the implementation of technical solutions. Attached Figure Description

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0052] Figure 1 This is the main flowchart of the method described in this invention;

[0053] Figure 2 This is a diagram defining the size grouping in the method described in this invention;

[0054] Figure 3 This is a schematic diagram of dimensional chain decomposition in the method described in this invention;

[0055] Figure 4 The adjustable group size in the method described in this invention is based on the hard point cross-sectional geometry.

[0056] Figure 5 This is a flowchart of the virtual and mule cart verification process in the method described in this invention;

[0057] Figure 6 This is a schematic block diagram of the device described in this invention. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0059] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Example 1

[0061] like Figure 1 As shown in the figure, this invention discloses a method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups. The method includes the following steps:

[0062] S1: Defines the fixed-size group and adjustable-size group in the vehicle architecture;

[0063] S2: Perform dimensional chain decomposition on the parts that need to be decomposed in the fixed dimension group, and determine the value of each decomposed dimension based on the design requirements;

[0064] S3: Lock fixed dimension group parameters to make the front cabin hardpoints, floor structure and human-machine reference points universal;

[0065] S4: Dynamically adjust adjustable size group parameters based on vehicle positioning;

[0066] S5: Based on the fixed dimension group parameters and adjustable dimension group parameters of the designed parts, through virtual verification and mule car verification, ensure that the values ​​of each dimension chain meet the geometric dimension compatibility, performance and functional objectives, and output the master dimension design results.

[0067] The steps described above will be explained in detail below:

[0068] like Figure 2 As shown, the fixed dimension group is defined as follows: L104 (front overhang), L113 (X-direction distance from the front wheel center to the ball of the foot BOF), L99 (horizontal distance between the H point and the ball of the foot BOF. The ball of the foot BOF is the starting point for determining the pedal position and foot posture. The H point (Hip Point), also known as the hip point or buttock point, represents the midpoint of the driver's hip joint after sitting down and is the most important reference for the ergonomic layout of the entire vehicle), and H30 (sitting height).

[0069] Define the adjustable size groups: L101 (wheelbase), L202 (cargo box length), L50 (seat pitch), H61 (headroom).

[0070] like Figure 3 As shown, the front overhang dimension L104 is decomposed into a dimensional chain (e.g., Figure 3 (and as shown in Table 1):

[0071] L104 = L1 + L2 + L3 + L4 + L5 + L6;

[0072] Table 1 - Dimension Chain Breakdown Table

[0073]

[0074] Serialization of fixed size groups:

[0075] By locking the front suspension L104, the X-direction distance L113 from the front wheel center to the foot position BOF, the horizontal distance L99 between the H point and the foot position BOF, and the seating height H30, the front cabin hardpoint, floor structure, and human-machine reference points are made universal across the entire platform, reducing redundant verification (e.g., Figure 4 (As shown).

[0076] Differentiated design of adjustable size groups:

[0077] Adjustable group size is based on hard point cross-sectional geometry (e.g.) Figure 4 (As shown) Adjustments:

[0078] When the wheelbase L101 is extended, the cargo box L202 is moved back and the seat spacing L50 is expanded simultaneously; when the headroom H61 is increased, the roof curve is optimized to maintain low wind resistance.

[0079] The specific process for virtual and mule-cart verification is as follows: Figure 5 As shown:

[0080] Step 1, Initial Verification:

[0081] The initially determined main dimensions (including fixed and adjustable dimension groups) are tested for geometric compatibility, performance, and functionality, and then it is determined whether the "target is met":

[0082] If the objective is met, proceed directly to the "output master dimension" step to complete the process.

[0083] If the objective is not met, proceed to step 2.

[0084] Step 2, adjust non-master dimension structures and perform secondary verification:

[0085] Optimize and adjust non-main dimension group related structures (i.e., auxiliary structures that do not involve the core parameters of fixed / adjustable dimension groups), and then perform "virtual and mule car verification" again to determine "whether the target is met":

[0086] If the objective is met, proceed to the "output master dimension" step to complete the process.

[0087] If the objective is not met, proceed to step 3.

[0088] Step 3, adjust the master size and verify multiple times:

[0089] Modify the main dimension parameters (core parameters of the fixed / adjustable dimension group), and then perform "virtual and mule car verification" again to determine "whether the target is met":

[0090] If the objective is met, proceed to the "output master dimension" step to complete the process.

[0091] If the objective is not met, repeat the cycle of "adjust master size → virtual and mule cart verification → determine whether the objective is met" until verification is successful.

[0092] Step 4, Output the master dimension:

[0093] Once the verification results of a certain round meet the design goals, the process ends and the final master dimension results are output for subsequent vehicle development.

[0094] Through a series of virtual verifications and mule car verifications, it is ensured that the assignment of each dimension chain meets the relevant target requirements such as geometric compatibility, performance, and functionality, and finally the master dimension result is output.

[0095] This application reduces redundant verification of the front compartment and floor by using fixed-size groups, shortening the development cycle by 30%-50%. Adjustable-size groups support rapid model derivation (e.g., CAR-A → SUV-A, only adjusting the wheelbase and cargo box). It supports multiple models such as CAR, SUV, and MPV sharing a platform, with a parts commonality rate of ≥70%.

[0096] Example 2

[0097] like Figure 6 As shown, this embodiment of the invention also discloses a vehicle architecture master dimension design device based on fixed and adjustable dimension groups, the device comprising:

[0098] Size grouping module 101: used to define fixed size groups and adjustable size groups in the vehicle architecture;

[0099] Dimension chain decomposition module 102: used to decompose the dimensions of components in a fixed dimension group that require dimension chain decomposition, and to determine the values ​​of each decomposed dimension based on design requirements;

[0100] Parameter locking module 103: used to lock fixed size group parameters, so that the front cabin hard points, floor structure and human-machine reference points have universality;

[0101] Dynamic adjustment module 104: used to dynamically adjust the adjustable size group parameters based on vehicle model positioning;

[0102] Verification module 105: Based on the fixed dimension group parameters and adjustable dimension group parameters of the designed parts, it verifies the values ​​of each dimension chain through virtual verification and mule cart verification, so that the geometric dimension compatibility, performance and functional objectives are met, and outputs the master dimension design results.

[0103] It should be noted that the specific implementation method of the module described in Embodiment 2 of the present invention can refer to the method described in Embodiment 1, and will not be repeated here.

[0104] Example 3

[0105] This invention discloses a method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups. The method is applied to CAR-A and SUV-A development examples, and specifically includes the following steps:

[0106] Step 1: Input: SUV height ≥ 1780mm, sedan height ≥ 1475mm;

[0107] Step 2: The forward cabin is shared, meaning L104 remains essentially unchanged, as shown in Table 2:

[0108] Table 2 - Size Chain Breakdown Table

[0109] CAR-A / SUVA Size Specifications Numerical value (unit: mm) L104 front suspension 975 L1 Clearance from the bumper beam to the front bumper 100 L2 Anti-collision beam thickness 35 L3 Gaps between anti-collision beam and radiator 30 L4 Intercooling thickness of radiator 190 L5 Powertrain to radiator gap 20 L6 Distance from the front of the engine to the center of the front wheel 600

[0110] Step 3: L113 is uniformly set to 540mm, and wheelbase L101: CAR-A ≥ 2800mm and SUV-A ≥ 3000mm, as shown in Table 3:

[0111] Table 3 - Size Grouping Definition Table (All values ​​in the table are in mm)

[0112]

[0113]

[0114] Step 4: Finally, verify using a digital model and a mule car.

[0115] The above are merely preferred embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups, characterized in that, The method includes the following steps: S1: Defines the fixed-size group and adjustable-size group in the vehicle architecture; S2: Perform dimensional chain decomposition on the parts that need to be decomposed in the fixed dimension group, and determine the value of each decomposed dimension based on the design requirements; S3: Lock fixed dimension group parameters to make the front cabin hardpoints, floor structure and human-machine reference points universal; S4: Dynamically adjust adjustable size group parameters based on vehicle positioning; S5: Based on the fixed dimension group parameters and adjustable dimension group parameters of the designed parts, through virtual verification and mule car verification, ensure that the values ​​of each dimension chain meet the geometric dimension compatibility, performance and functional objectives, and output the master dimension design results.

2. The method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups according to claim 1, characterized in that, In step S1: The fixed dimensions include the front overhang distance L104, the X-direction distance from the front wheel center to the ball of the foot BOF L113, the X-direction distance from the hip point H to the ball of the foot BOF L99, and the seat height H30. The adjustable size group includes wheelbase L101, cargo box length L202, seat pitch L50, and headroom H61.

3. The method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups according to claim 1, characterized in that, In step S2: The components requiring dimensional chain decomposition include the front overhang L104. The dimensional chain decomposition formula for the front overhang L104 is as follows: L104 = L1 + L2 + L3 + L4 + L5 + L6 Wherein, L1 is the clearance from the anti-collision beam to the front bumper, L2 is the thickness of the anti-collision beam, L3 is the clearance from the anti-collision beam to the radiator, L4 is the thickness of the radiator intercooler, L5 is the clearance from the powertrain to the radiator, and L6 is the distance from the front of the engine to the front wheel center.

4. The method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups according to claim 1, characterized in that, In step S4: The adjustable size group is adjusted based on the hard-point cross-sectional geometry, and the parameters of the adjustable size group include: When the wheelbase L101 is extended, the cargo box L202 is moved back simultaneously and the seat spacing L50 is expanded. When the headroom H61 is increased, the roof curve is optimized.

5. The method for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups according to claim 1, characterized in that, In step S5: Virtual verification and mule verification are used to check the compatibility, performance and functional compliance of the dimension chain assignment. If the compliance is not met, the relevant structures or main dimension parameters of the non-main dimension group are adjusted.

6. A device for designing the main dimensions of a vehicle architecture based on fixed and adjustable size groups, characterized in that, The device includes: Size grouping module: used to define fixed size groups and adjustable size groups in the vehicle architecture; Dimension chain decomposition module: Used to decompose the dimensions of components in a fixed dimension group that require dimension chain decomposition, and to determine the values ​​of each decomposed dimension based on design requirements; Parameter locking module: used to lock fixed size group parameters, making the front cabin hardpoints, floor structure and human-machine reference points universal; Dynamic adjustment module: used to dynamically adjust the parameters of adjustable size groups based on vehicle model positioning; Verification module: Based on the fixed and adjustable dimension group parameters of the designed parts, it uses virtual verification and mule cart verification to ensure that the values ​​of each dimension chain meet the geometric compatibility, performance and functional objectives, and outputs the master dimension design results.

7. The vehicle architecture master dimension design device based on fixed and adjustable dimension groups according to claim 6, characterized in that, The fixed dimensions include the front overhang distance L104, the X-direction distance from the front wheel center to the ball of the foot BOF L113, the X-direction distance from the H point to the ball of the foot BOF L99, and the seat height H30. The adjustable size group includes wheelbase L101, cargo box length L202, seat pitch L50, and headroom H61.

8. The vehicle architecture master dimension design device based on fixed and adjustable dimension groups according to claim 6, characterized in that, The components requiring dimensional chain decomposition include the front overhang L104. The dimensional chain decomposition formula for the front overhang L104 is as follows: L104 = L1 + L2 + L3 + L4 + L5 + L6; Wherein, L1 is the clearance from the anti-collision beam to the front bumper, L2 is the thickness of the anti-collision beam, L3 is the clearance from the anti-collision beam to the radiator, L4 is the thickness of the radiator intercooler, L5 is the clearance from the powertrain to the radiator, and L6 is the distance from the front of the engine to the front wheel center.

9. The vehicle architecture master dimension design device based on fixed and adjustable dimension groups according to claim 6, characterized in that, The adjustable size group parameters include: When the wheelbase L101 is extended, the cargo box L202 is moved back simultaneously and the seat spacing L50 is expanded. When the headroom H61 is increased, the roof curve is optimized.

10. The vehicle architecture master dimension design device based on fixed and adjustable dimension groups according to claim 6, characterized in that, In the verification module: Virtual verification and mule verification are used to check the compatibility, performance and functional compliance of the dimension chain assignment. If the compliance is not met, the relevant structures or main dimension parameters of the non-main dimension group are adjusted.

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