An emulated rear suspension parameter adjustment method, system, device and medium

Abstract

The application provides a simulation-based rear suspension parameter adjustment method, system, device and medium, which comprises the following steps: obtaining target parts associated with each rear suspension parameter, constructing an assembly structure tree based on the connection points of the target parts, and the assembly structure tree is used to represent the composition and assembly sequence of different target parts; determining the assembly fitting points of each part and the corresponding target part according to the assembly structure tree; constructing a tolerance analysis model according to the assembly fitting points, and performing assembly iteration on each assembly fitting point based on the tolerance analysis model, so that the assembly tolerance of each assembly fitting point meets the preset tolerance constraint, thereby obtaining a target assembly scheme and the position adjustment range of the target parts based on the corresponding connection points, and performing physical assembly based on the target assembly scheme and the position adjustment range. The application can effectively improve the accuracy and efficiency of rear suspension parameter adjustment.

Description

Technical Field

[0001] This application relates to the field of simulation, and more particularly to a method, system, device, and medium for adjusting rear suspension parameters. Background Technology

[0002] As consumers demand higher levels of vehicle stability, both the design and manufacturing of vehicle chassis parameters are placing increasing emphasis on the actual achievement and matching capabilities of chassis parameters.

[0003] CN108382470B discloses a suspension for a vehicle and a vehicle having the same. The suspension includes a subframe, an upper control arm, and two H-arms. The two H-arms are connected to both ends of the subframe, and steering knuckles are mounted on the H-arms. One end of the upper control arm is connected to the steering knuckle, and the other end is connected to the subframe. The subframe, upper control arm, and H-arms are all made of aluminum alloy. This structure significantly improves the chassis layout space, enhancing fuel economy and product stability.

[0004] CN109333048A discloses an automatic wheel camber adjustment device, characterized in that it includes a first positioning and clamping mechanism, a second positioning and clamping mechanism, an adjustment mechanism, a tightening mechanism, and a worktable. The first positioning and clamping mechanism includes a first positioning mechanism and a first clamping mechanism, and the second positioning and clamping mechanism includes a second positioning mechanism and a second clamping mechanism. A frame is provided on the worktable, the first clamping mechanism is disposed on the worktable, and the first positioning mechanism is disposed on the side of the first clamping mechanism to cooperate with it. The second positioning mechanism is disposed on the frame, the second clamping mechanism is connected to the second positioning mechanism, the adjustment mechanism is connected to the second clamping mechanism, and the tightening mechanism is disposed on both sides of the second positioning and clamping mechanism to cooperate with it. This tooling improves manual adjustment operations to a certain extent and enhances product manufacturing efficiency.

[0005] CN113435029A discloses an automatic modeling method, device, and storage medium for automotive chassis dynamics analysis, comprising the following steps: S1, acquiring parameter information and writing it into an Excel input table; S2, establishing a corresponding basic model based on the chassis suspension type, and exporting the basic model as a .cdb file recognizable by the dynamics analysis software; S3, reading the installation address of the dynamics analysis software through a Python automatic modeling calculation script; S4, reading suspension model parameters through the Python automatic modeling calculation script to determine the corresponding .cdb file of the basic model; S5, reading the modeling parameters through the Python automatic modeling calculation script and writing them into the .cdb file of the basic model; S6, reading load parameters through the Python automatic modeling calculation script and writing them into the command file in the dynamics analysis software to drive the dynamics analysis software to perform whole-vehicle load setting simulation. This patent achieves fast, efficient, and low-error-rate automatic modeling for automotive chassis dynamics analysis simulation by reading modeling parameters and load parameters from an Excel input table through a Python automatic modeling calculation script and writing the read modeling parameters and load parameters into the .cdb file of the basic model and the command file of the dynamics analysis software, respectively. However, this patent only models the pre-set modeling parameters and load parameters, making it difficult to analyze and adjust candidate parameters in real time and to assess the feasibility of the parameters.

[0006] The product design, tooling implementation, and parameter analysis methods described above only cover a portion of the chassis four-wheel alignment parameters. Analysis of the manufacturing feasibility of parameters that are of greater concern in product manufacturing, as well as the rationality of design allowances, remains lacking. With the accelerating pace of product updates and iterations in the market, the analysis of parameter feasibility is becoming increasingly crucial for positively impacting time and equipment investment. Summary of the Invention

[0007] In view of the problems existing in the prior art, this application proposes a simulation-based rear suspension parameter adjustment method, system, device and medium, which mainly solves the problem that the existing parameter adjustment methods are inefficient and cannot meet market demands.

[0008] To achieve the above and other objectives, the technical solution adopted in this application is as follows.

[0009] This application provides a simulation-based method for adjusting rear overhang parameters, comprising: acquiring target components associated with each rear overhang parameter; constructing an assembly structure tree based on the connection points of the target components, wherein the assembly structure tree is used to characterize the composition and assembly sequence of different target components; determining the assembly fitting points of each component and the corresponding target component according to the assembly structure tree; constructing a tolerance analysis model based on the assembly fitting points; performing assembly iteration on each assembly fitting point based on the tolerance analysis model, such that the assembly tolerance of each assembly fitting point satisfies a preset tolerance constraint, thereby obtaining a target assembly scheme and the position adjustment range of the target components based on the corresponding connection points; and performing physical assembly based on the target assembly scheme and the position adjustment range.

[0010] In one embodiment of this application, before obtaining the target component associated with each rear suspension parameter, the method further includes: obtaining the directional displacement of the connection points of each component in a preset mechanical motion model, wherein the mechanical motion model is obtained by simulation based on the chassis suspension structure; and determining the component associated with each rear suspension parameter as the target component based on the change in the corresponding rear suspension parameter under the action of the directional displacement.

[0011] In one embodiment of this application, the target components in the mechanical motion model include: a vehicle body, a rear subframe, an upper control arm, a lower control arm, a toe-in adjustment rod, a camber adjustment rod, a rear steering knuckle, a shock absorber, a shock absorber, and a tire; the tire and the rear steering knuckle are connected to form an integral structure; the rear steering knuckle is ball-connected to the upper control arm, the lower control arm, the toe-in adjustment rod, and the camber adjustment rod via multiple connection points on its inner side through connecting bushings; the lower control arm and the rear subframe are connected through a predetermined connection point between the lower control arm and the rear subframe; the rear subframe and the vehicle body are connected through a predetermined connection point between the rear subframe and the vehicle body; the shock absorber and the shock absorber are disposed between the rear subframe and the vehicle body.

[0012] In one embodiment of this application, the rear suspension parameters include: rear wheel toe angle and rear wheel camber angle. Determining the components associated with each rear suspension parameter based on the change in the corresponding rear suspension parameter under the action of the directional displacement includes: applying directional displacements in multiple preset directions to the connection points of each component in the mechanical motion model; recording the changes in the rear wheel toe angle and rear wheel camber angle when each component connection point reaches the corresponding directional displacement; and identifying the component at the connection point where the change exceeds a preset threshold as the component associated with the rear wheel toe angle or the rear wheel camber angle.

[0013] In one embodiment of this application, constructing an assembly structure tree based on the connection points of the target component includes: obtaining the assembly process of each component in the mechanical motion model; taking the target component as a parent node and determining the child nodes associated with the parent node according to the assembly process; and obtaining the assembly structure tree according to the association relationship between the parent node and the child nodes.

[0014] In one embodiment of this application, determining the assembly fitting point between each component and the corresponding target component according to the assembly structure tree includes: using the connection point of the target component in the assembly structure tree as a constraint point, determining the contact point between each component and the corresponding target component based on the constraint point; determining the constraint direction of the contact point according to the change in the rear overhang parameter, so as to construct the assembly fitting point of the corresponding target component according to the contact point and the corresponding constraint direction.

[0015] In one embodiment of this application, before performing assembly iteration on each assembly fitting point based on the tolerance analysis model, the method further includes: determining the parts that need to be positioned in the assembly structure tree based on historical assembly data; obtaining a preset virtual positioning fixture for the parts that need to be positioned, and performing assembly iteration based on the preset virtual positioning fixture.

[0016] In one embodiment of this application, assembly iteration is performed on each of the assembly fitting points based on the tolerance analysis model, including: determining the tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the assembly data distribution pattern of the corresponding components after assembly during the production process in the historical time period according to the tolerance analysis model; completing the initial assembly according to the assembly fitting points, calculating whether the position of each component in the current assembly state meets the tolerance and the assembly data distribution pattern, and if not, adjusting the assembly angle of the corresponding component according to the preset step size until the corresponding tolerance and the assembly data distribution pattern are met, thereby obtaining the target assembly scheme, wherein the target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the assembly data distribution pattern.

[0017] In one embodiment of this application, physical assembly based on the target assembly scheme and the position adjustment range includes: configuring the direction adjustment amount of the connection point of the corresponding target component according to the position adjustment range; configuring the pre-tightening positioning fixture and pre-tightening sequence of each component based on the direction adjustment amount; fastening according to the pre-tightening fixture and pre-tightening sequence; measuring the rear overhang parameter according to the preset measuring points of the corresponding component; and determining the adjustment sequence of each component according to the measurement results to meet the assembly tolerance.

[0018] This application also provides a simulation-based rear overhang parameter adjustment system, comprising: an assembly tree construction module for acquiring target components associated with each rear overhang parameter, constructing an assembly structure tree based on the connection points of the target components, the assembly structure tree being used to characterize the composition and assembly sequence of different target components; a fitting point acquisition module for determining the assembly fitting points of each component and the corresponding target component according to the assembly structure tree; and a tolerance allocation module for constructing a tolerance analysis model based on the assembly fitting points, performing assembly iteration on each assembly fitting point based on the tolerance analysis model, such that the assembly tolerance of each assembly fitting point satisfies a preset tolerance constraint, thereby obtaining a target assembly scheme and the position adjustment range of the target components based on the corresponding connection points, and performing physical assembly based on the target assembly scheme and the position adjustment range.

[0019] This application also provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the simulation-based rear suspension parameter adjustment method.

[0020] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the simulation-based rear suspension parameter adjustment method.

[0021] As described above, the simulation-based rear suspension parameter adjustment method, system, device, and medium of this application have the following beneficial effects.

[0022] This application constructs an assembly structure tree based on target components associated with rear overhang parameters. By utilizing the high influence of target components on rear overhang parameters for tolerance analysis, an assembly scheme that meets production requirements and the available position adjustment range can be obtained, providing reliable data support for subsequent physical assembly. By optimizing assembly-related parameters and adjusting assembly methods through simulation modeling, the cost of prototyping and verification can be reduced, the steps from design to production can be simplified, the efficiency from design to mass production can be improved, and market demands can be responded to quickly. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating a simulation-based rear suspension parameter adjustment method in one embodiment of this application.

[0024] Figure 2 This is a flowchart illustrating the model building process in one embodiment of this application.

[0025] Figure 3 This is a simplified structural diagram of a mechanical motion model in one embodiment of this application.

[0026] Figure 4This is a schematic diagram of the rear suspension structure in one embodiment of this application.

[0027] Figure 5 This is an exploded view of the rear overhang structure in one embodiment of this application.

[0028] Figure 6 This is a schematic diagram of the assembly structure tree in one embodiment of this application.

[0029] Figure 7 This is a schematic diagram of the structural positioning of the tolerance analysis model in one embodiment of this application.

[0030] Figure 8 This is a schematic diagram of the structural positioning of the tolerance analysis model in another embodiment of this application.

[0031] Figure 9 This is a structural schematic diagram of one of the components that requires positioning in one embodiment of this application.

[0032] Figure 10 This is a structural schematic diagram of one of the components that requires positioning in one embodiment of this application.

[0033] Figure 11 This is a structural schematic diagram of one of the components that requires positioning in one embodiment of this application.

[0034] Figure 12 This is a schematic diagram of the measurement points for the rear overhang parameter in a tolerance analysis model according to one embodiment of this application.

[0035] Figure 13 This is a schematic diagram showing the tolerances corresponding to the Y-axis adjustment of the upper control arm and the Y-axis adjustment of the toe-in adjustment rod in a tolerance analysis model of one embodiment of this application.

[0036] Figure 14 This is a schematic diagram of the calculation results of the rear overhang parameters obtained by the assembly iteration operation in one embodiment of this application.

[0037] Figure 15 This is a schematic diagram of the hole arrangement at the connection point between the rear subframe, the toe-in adjusting rod, and the upper control arm, obtained after tolerance analysis in one embodiment of this application.

[0038] Figure 16 This is a schematic diagram of the selection of eccentric bolts in one embodiment of this application.

[0039] Figure 17 This is a schematic diagram of the parameter adjustment structure in one embodiment of this application.

[0040] Figure 18 This is a schematic diagram of the parameter adjustment tooling generated based on the target assembly scheme in one embodiment of this application.

[0041] Figure 19This is a block diagram of a simulation-based rear suspension parameter adjustment system in one embodiment of this application.

[0042] Figure 20 This is a schematic diagram of the device in one embodiment of this application. Detailed Implementation

[0043] The following specific examples illustrate the implementation of this application. 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 noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0044] 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.

[0045] Please see Figure 1 This application provides a simulation-based method for adjusting rear suspension parameters, which includes the following steps:

[0046] Step S100: Obtain the target components associated with each rear overhang parameter, and construct an assembly structure tree based on the connection points of the target components. The assembly structure tree is used to characterize the composition and assembly sequence of the different target components.

[0047] In one embodiment, in order to quickly and efficiently adjust the rear suspension parameters, components that are highly correlated with the rear suspension parameters that need to be adjusted can be pre-determined, and then assembly schemes and available adjustment amounts can be configured for these components.

[0048] In one embodiment, before obtaining the target component associated with each rear suspension parameter, the method further includes: obtaining the directional displacement of the connection points of each component in a preset mechanical motion model, wherein the mechanical motion model is obtained by simulation based on the chassis suspension structure; and determining the component associated with each rear suspension parameter as the target component based on the change in the corresponding rear suspension parameter under the action of the directional displacement.

[0049] Specifically, a mechanical motion model can be constructed based on the suspension hardpoint arrangement. Then, based on this mechanical motion model, the influence values ​​of the rear suspension parameters corresponding to the displacement in different directions can be output. The components corresponding to the rear suspension parameters that are greatly affected by the displacement in different directions are identified as components with significant influence. Then, based on the components with significant influence, the assembly relationship of the tolerance analysis model is constructed to build the tolerance analysis model. According to the tolerance analysis model, the tolerance is allocated to each component to determine the influence of the assembly process on the rear suspension parameters. Then, the assembly method in the production process is determined to obtain the target assembly scheme.

[0050] Please see Figure 2 The model building process can be described as follows: First, the technical requirements of the suspension components, such as connection methods and tolerances, are input into the simulation software. Then, the simulation software is used to analyze the four-wheel alignment tolerances of the suspension. If the tolerance constraints are met, the tolerance range of each suspension component, the assembly sequence in the assembly and manufacturing process, and the positioning tooling are determined. Simultaneously, measuring points can be set on each component, and the rear suspension parameters are obtained by detecting these points with testing equipment to determine whether the rear suspension parameters meet the preset thresholds. A mechanical motion model can also be constructed, and the connection points of each component in the mechanical motion model are experimentally verified to determine the changes in the rear suspension parameters under different directional offset constraints. This determines the correlation between the components in the mechanical motion model. Then, components with a high influence on the rear suspension parameters are selected as target components, and the connection methods between the components are determined. This facilitates the construction of an assembly structure tree in the assembly process based on these connection methods.

[0051] In one embodiment, a mechanical motion model can be built based on the chassis suspension structure. The target components in the mechanical motion model include: a vehicle body, a rear subframe, an upper control arm, a lower control arm, a toe-adjusting rod, a camber adjusting rod, a rear steering knuckle, a shock absorber, a shock absorber, and a tire. The tire and the rear steering knuckle are connected to form an integral structure. The rear steering knuckle is ball-connected to the upper control arm, the lower control arm, the toe-adjusting rod, and the camber adjusting rod via multiple connection points on its inner side, respectively, through connecting bushings. A connection is established between the lower control arm and the rear subframe through a predetermined connection point. A connection is also established between the rear subframe and the vehicle body through a predetermined connection point. The shock absorber and the shock absorber are disposed between the rear subframe and the vehicle body.

[0052] Specifically, please refer to Figure 5 The suspension mechanical structure mainly includes the following components:

[0053] Vehicle body, rear subframe 2, upper control arm 9, lower control arm 3, toe-in adjustment rod 4, camber adjustment rod 10, rear steering knuckle 7, shock absorber spring 5, shock absorber, tire 6.

[0054] First, install the following parts in the mechanical motion model. That is:

[0055] Tire 6 and rear steering knuckle 1 are connected by 5 bolts to form a single unit.

[0056] The rear horn has four connection points on the inside, which are bolted to the upper control arm, lower control arm, and toe-in adjusting rod.

[0057] The lower control arm has two connection points with the rear subframe.

[0058] The rear subframe is connected to the vehicle body at four points.

[0059] Secondly, based on the operating conditions encountered during vehicle operation, each connection point is assigned a motion mode, namely:

[0060] When a vehicle is subjected to lateral and longitudinal external forces, the wheels drive the rear steering knuckle to rotate and move up and down, left and right, and forward and backward, and the force is transmitted through the ball joint.

[0061] Please see Figure 4 The mechanical motion model of each connection point is constructed as follows:

[0062] The rear saddle, along with the upper control arm, lower control arm, toe-in adjuster, and camber adjuster, is connected to a ball joint via a connecting bushing. During the transmission of lateral and longitudinal forces, it can rotate and compress around the ball's center.

[0063] The inner side of the lower control arm is connected to the rear subframe through two points, which is simplified to an axis. When under force, it can rotate along the axis and transmit or unload lateral impact force through bushing compression.

[0064] Similarly, the upper control arm and lower control arm, the toe-in adjustment rod and the subframe, and the camber adjustment rod and the subframe are all connected by a single-point ball joint. When subjected to force, they can rotate around the center of the ball and compress to complete the transmission or dissipation of impact force.

[0065] The shock absorber spring and shock absorber are placed between the subframe and the vehicle body. Their function is to relieve force in the vertical direction through spring compression and shock absorber strut stroke.

[0066] Please see Figure 3 , Figure 3 The simplified connection relationships of the components in the mechanical motion model are shown.

[0067] After the above model is built, establish observation points for the rear wheel toe angle and rear wheel camber angle. These rear wheel toe angle and rear wheel camber angle are the rear suspension parameters that need to be adjusted.

[0068] In one embodiment, determining the components associated with each rear suspension parameter based on the change in the corresponding rear suspension parameter under the action of the directional displacement includes: applying directional displacements in multiple preset directions to the connection points of each component in the mechanical motion model; recording the changes in the rear wheel toe angle and the rear wheel camber angle when the connection points of each component reach the corresponding directional displacements; and designating the component at the connection point where the change exceeds a preset threshold as the component associated with the rear wheel toe angle or the rear wheel camber angle.

[0069] Specifically, displacements are applied in the XYZ directions at the connection points of the rear steering knuckle and the outer side of the upper control arm, the front connection point of the lower control arm, and the rear connection point. The influence of the displacement in each direction on the rear wheel toe angle and camber angle is output (as shown in Tables 1 and 2). This determines whether the influence of each direction of the connection point on the parameters is correlated, thereby determining the simplified assembly mode of the parts in the system tolerance analysis model.

[0070] Table 1

[0071]

[0072] Table 2

[0073]

[0074] Based on the above calculations, the control directions that significantly affect the exotropy and toe at the three core ball joint connection points of the posterior horn are mainly: X and Y directions at the front and rear ball joints of the lower control arm, and Y direction at the outer ball joint of the upper control arm.

[0075] Step S110: Determine the assembly fitting points between each component and the corresponding target component based on the assembly structure tree.

[0076] In one embodiment, constructing an assembly structure tree based on the connection points of the target component includes: obtaining the assembly process of each component in the mechanical motion model; taking the target component as a parent node and determining the child nodes associated with the parent node according to the assembly process; and obtaining the assembly structure tree according to the association relationship between the parent node and the child nodes.

[0077] Specifically, please refer to Figure 6-8 Import the components related to the rear suspension parameters into the model. According to the assembly process, build a parent-child assembly structure tree, namely: the lower control arm self-positions to the rear subframe in the XYZ direction, the upper control arm self-positions to the rear subframe in the XZ direction, the rear steering knuckle self-positions to the rear subframe in the XY direction, and the toe-in adjusting rod is finally positioned to the rear steering knuckle and the rear subframe in the XZ direction.

[0078] In one embodiment, the relationships and assembly relationships of each component can be determined according to the assembly structure tree. For example, the rear subframe 2 is assembled to the rear suspension parameter adjustment fixture 12 by constraining 6 degrees of freedom; the lower control arm 3 is assembled to both the rear suspension parameter adjustment fixture 12 and the rear subframe 2 by constraining 6 degrees of freedom; the lower control arm connector 10 is assembled to the lower control arm 3 by aligning its center point; and the upper control arm 9 is assembled to the rear subframe 2 by aligning its center point. Thus, the rear subframe subassembly is formed. The rear steering knuckle 7 is assembled to the rear subframe subassembly by constraining 6 degrees of freedom.

[0079] In one embodiment, determining the assembly fitting point between each component and the corresponding target component based on the assembly structure tree includes: using the connection point of the target component in the assembly structure tree as a constraint point, determining the contact point between each component and the corresponding target component based on the constraint point; determining the constraint direction of the contact point based on the change in the rear overhang parameter, so as to construct the assembly fitting point of the corresponding target component based on the contact point and the corresponding constraint direction.

[0080] In one embodiment, please refer to Figure 12 Based on the above constraints, features are picked up on the part, and assembly fitting points are constructed according to the contact points. Specifically, feature points 7-6, 7-7, and 7-8 can be picked up on the end face of the rear steering knuckle 7. These three points form a surface, constituting the angle measurement surface of the measured element. The angle formed by the projection of vector I and the XZ plane is the rear wheel camber angle. The angle formed by the projection of K onto the XZ plane is the rear wheel toe angle. Please refer to [link to relevant documentation]. Figure 18 After importing the corresponding coordinate values, adjust the hanging parameters of fixture 12 to form measurement pick points 12-3, 12-4, and 12-5.

[0081] Step S120: Construct a tolerance analysis model based on the assembly fitting points, and perform assembly iteration on each assembly fitting point based on the tolerance analysis model so that the assembly tolerance of each assembly fitting point meets the preset tolerance constraint, thereby obtaining the target assembly scheme and the position adjustment range of the target parts based on the corresponding connection points, and perform physical assembly based on the target assembly scheme and the position adjustment range.

[0082] In one embodiment, before performing assembly iteration on each of the assembly fitting points based on the tolerance analysis model, the method further includes: determining the parts that need to be positioned in the assembly structure tree based on historical assembly data; obtaining a preset virtual positioning fixture for the parts that need to be positioned, and performing assembly iteration based on the preset virtual positioning fixture.

[0083] Specifically, please refer to Figure 9-11For components requiring positioning, namely the rear subframe, lower control arm, and rear steering knuckle, a virtual positioning fixture is set up. This virtual positioning fixture ensures that the components requiring positioning remain in their theoretical positions during assembly. For example, components requiring positioning may include the rear subframe 2, lower control arm 3, and rear steering knuckle 7.

[0084] In one embodiment, the assembly iterative process for each assembly fitting point based on the tolerance analysis model includes: determining the tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the assembly data distribution pattern of the corresponding components after assembly during the production process in the historical time period according to the tolerance analysis model; completing the initial assembly based on the assembly fitting points; calculating whether the position of each component in the current assembly state meets the tolerance and the assembly data distribution pattern; if not, adjusting the assembly angle of the corresponding component according to the preset step size until the corresponding tolerance and the assembly data distribution pattern are met, thereby obtaining the target assembly scheme, wherein the target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the assembly data distribution pattern.

[0085] Specifically, component tolerances, tooling tolerances, and the distribution pattern of assembly data (i.e., normal distribution, uniform distribution, etc.) after the corresponding components are assembled during the production process in a historical period can be predefined.

[0086] In one embodiment, measurement points are established by picking up features on the rear steering knuckle surface, namely the rear wheel toe angle and the rear wheel camber angle. At the same time, the center point of the toe adjustment rod at the connection point of the rear subframe is picked up, and the Y-direction position measurement point of the toe adjustment rod is defined. Similarly, the Y-direction position measurement point of the upper control arm is defined.

[0087] In one embodiment, since the aforementioned steps determine the direction with significant influence on the connection point of each component based on the directional displacement, the direction with significant influence can be used as the constraint direction of the corresponding assembly fitting point.

[0088] In one embodiment, the initial tolerances of the vehicle body beam assembly 1, rear subframe 2, lower control arm 3, toe-in adjustment rod 4, rear steering knuckle 7, upper control arm 9, and lower control arm connector 10, as well as the tolerances of the rear suspension parameter adjustment fixture 12, can be preset, and the initial distribution pattern of the data (i.e., normal distribution, uniform distribution, etc.) can be selected.

[0089] In one embodiment, the adjustment iteration conditions for the rear overhang parameters can be preset before the assembly iteration. For example, the camber angle adjustment iteration conditions are set. When the calculation results in camber exceeding the set camber angle threshold, the rear horn 7 is rotated in the direction of vector I with the connection point of the upper control arm 9 as the center, and the iteration is performed in steps of 0.01° until the calculation meets the adjustment iteration conditions and then proceeds to the next step of the calculation.

[0090] Reassemble control arm 9, aligning its connection center point with ball joint 7-1 of the rear steering knuckle 7. Use the Y-direction center distance between point 9-1 of the upper control arm 9 and the rear subframe 2 as the measured element, such as... Figure 13 As shown in the figure, USL and LSL represent the upper and lower tolerance limits for the center point to coincide. This is used to determine whether the position after reassembly is within the upper and lower tolerance limits.

[0091] Similarly, iterative conditions for toe-in adjustment can be set. When the toe-in exceeds the tolerance during the calculation, the connection point of toe-in adjustment rod 4 (i.e., Figure 3 Centered on point 7-5 (shown), rotate the rear horn 7 in the direction of vector K, iterating in steps of 0.01° until the calculation meets the adjustment iteration conditions and then proceeds to the next step of the calculation.

[0092] Assemble the toe-in adjusting rod 4, aligning its connection center point with ball joints 7-5 of the rear steering knuckle 7. The Y-direction center distance between point 4-1 of the toe-in adjusting rod 4 and the rear subframe 2 is the measured element. Figure 13 As shown in the figure, USL and LSL represent the upper and lower tolerance limits for the center point to coincide. This is used to determine whether the position after reassembly is within the upper and lower tolerance limits.

[0093] Based on the aforementioned adjusted iteration conditions, simulation iterations can be performed. The sample size for simulation iterations can be preset to 5000 or 10000. The number of iterations can also be set and adjusted according to actual application requirements; no limitation is imposed here. After completing the iterative calculations based on the tolerance analysis model, similar results can be obtained. Figure 14 The parameter calculation results shown are truncated at both ends because the model settings stipulate that the toe and camber calculations are always iterated according to the tolerance and adjustment range constraints. Therefore, the Y-axis deviation of the toe adjustment rod 4 and the upper control arm 9 can be obtained.

[0094] In one embodiment, physical assembly based on the target assembly scheme and the position adjustment range includes: configuring the directional adjustment amount of the connection point of the corresponding target component according to the position adjustment range; configuring the pre-tightening positioning fixture and pre-tightening sequence of each component based on the directional adjustment amount; fastening according to the pre-tightening fixture and pre-tightening sequence; measuring the rear overhang parameter according to the preset measuring points of the corresponding component; and determining the adjustment sequence of each component according to the measurement results to meet the assembly tolerance.

[0095] In one embodiment, based on the calculated Y-axis tolerance range of the upper control arm and toe-in adjusting rod, the Y-axis adjustment amount at the connection between the upper control arm, toe-in adjusting rod, and rear subframe is designed. A pre-tightening fixture positioning system is designed to determine the pre-tightening and partial tightening sequence of the connection points. An adjustment fixture positioning system is determined to determine the tightening sequence of the connection points. Based on the measurement points of the tolerance analysis model, physical modeling is performed, and the parameter measurement thresholds for the sub-assembly station are planned to determine the adjustment sequence of the eccentric bolts.

[0096] Specifically, based on the deviation, the connecting holes on the rear subframe 2 are adjusted according to... Figure 15 Optimize the design and select eccentric bolt 11, as shown. Figure 16 As shown.

[0097] Among them, the mounting point of the rear subframe 2 includes two parts of data. 2-1 is a raised structure, the width of which is designed with a gap of 0.2mm with the flange diameter of the eccentric bolt 11. At the other end of the eccentric bolt, there is an anti-rotation washer 11-1 and a matching groove 11-2. There are scales 11-3 on both the washer 11-1 and the flange surface of the bolt head for manual visual adjustment reference.

[0098] The purpose of the above structure is that when the eccentric bolt 11 is adjusted, it can be limited by the limiting rib 2-1 to ensure that its two ends can only rotate and cannot move. Through the friction between the screw and the toe adjustment rod 4 and the bushing arm of the upper control arm 9, the toe adjustment rod 4 and the upper control arm 9 are driven to move in the Y direction, so as to adjust the two parameters.

[0099] Furthermore, the above scheme is converted into an adjustment fixture 12, which has the same structure as the above scheme, including a positioning part 12-1 and a measuring part 12-3, as well as a deviation display 12-2. Based on the deviation indication, the adjustment mechanism 12-4 executes the adjustment command to complete the parameter adjustment.

[0100] This method enables the assembly positioning, system tolerance allocation, and forward development design of rear suspension-related components. By combining mechanical simulation, the accuracy of the tolerance analysis model can be significantly improved, reducing errors in tolerance allocation. Through the above analysis, the specific execution method for assembling rear suspension-related components and the locations of parameter measurement points were determined. Based on this data, the tooling for adjusting rear suspension parameters was designed. Compared with traditional tooling development, this method provides two additional steps of simulation data support, further reducing the cost of trial and error in later production, and is worthy of wider application in more fields.

[0101] Please see Figure 19 , Figure 19This is a block diagram of a simulation-based rear overhang parameter adjustment system according to an embodiment of this application. The system includes: an assembly tree construction module 190, used to acquire target components associated with each rear overhang parameter, and construct an assembly structure tree based on the connection points of the target components. The assembly structure tree is used to characterize the composition and assembly order of different target components; a fitting point acquisition module 191, used to determine the assembly fitting points of each component and the corresponding target component according to the assembly structure tree; and a tolerance allocation module 192, used to construct a tolerance analysis model based on the assembly fitting points, and perform assembly iteration on each assembly fitting point based on the tolerance analysis model, so that the assembly tolerance of each assembly fitting point meets the preset tolerance constraint, thereby obtaining the target assembly scheme and the position adjustment range of the target components based on the corresponding connection points, and performing physical assembly based on the target assembly scheme and the position adjustment range.

[0102] In one embodiment, before acquiring the target component associated with each rear suspension parameter, the assembly tree construction module 190 further includes: acquiring the directional displacement of the connection points of each component in a preset mechanical motion model, wherein the mechanical motion model is obtained by simulation based on the chassis suspension structure; and determining the component associated with each rear suspension parameter as the target component based on the change in the corresponding rear suspension parameter under the action of the directional displacement.

[0103] In one embodiment, the target components in the mechanical motion model include: a vehicle body, a rear subframe, an upper control arm, a lower control arm, a toe-in adjustment rod, a camber adjustment rod, a rear steering knuckle, a shock absorber, a shock absorber, and a tire; the tire and the rear steering knuckle are connected to form an integral structure; the rear steering knuckle is ball-connected to the upper control arm, the lower control arm, the toe-in adjustment rod, and the camber adjustment rod via multiple connection points on its inner side through connecting bushings; the lower control arm and the rear subframe are connected through a predetermined connection point between the lower control arm and the rear subframe; the rear subframe and the vehicle body are connected through a predetermined connection point between the rear subframe and the vehicle body; the shock absorber and the shock absorber are disposed between the rear subframe and the vehicle body.

[0104] In one embodiment, the assembly tree construction module 190 is further used to determine the components associated with each rear suspension parameter based on the change in the corresponding rear suspension parameter under the action of the directional displacement, including: applying directional displacement in multiple preset directions to the connection points of each component in the mechanical motion model; recording the change in the rear wheel toe angle and rear wheel camber angle when each component connection point reaches the corresponding directional displacement; and designating the component at the connection point where the change exceeds a preset threshold as the component associated with the rear wheel toe angle or the rear wheel camber angle.

[0105] In one embodiment, the assembly tree construction module 190 is further configured to construct an assembly structure tree based on the connection points of the target component, including: obtaining the assembly process of each component in the mechanical motion model; taking the target component as a parent node, determining the child nodes associated with the parent node according to the assembly process; and obtaining the assembly structure tree according to the association relationship between the parent node and the child nodes.

[0106] In one embodiment, the fitting point acquisition module 191 is further configured to determine the assembly fitting points of each component and the corresponding target component according to the assembly structure tree, including: taking the connection points of the target components in the assembly structure tree as constraint points, determining the contact points of each component and the corresponding target component based on the constraint points; determining the constraint direction of the contact points according to the change of the rear overhang parameter, so as to construct the assembly fitting points of the corresponding target components according to the contact points and the corresponding constraint directions.

[0107] In one embodiment, the tolerance allocation module 192 is further configured to, before performing assembly iteration on each of the assembly fitting points based on the tolerance analysis model, further include: determining the parts that need to be positioned in the assembly structure tree based on historical assembly data; obtaining a preset virtual positioning fixture for the parts that need to be positioned, so as to perform assembly iteration based on the preset virtual positioning fixture.

[0108] In one embodiment, the tolerance allocation module 192 is further configured to perform assembly iteration on each of the assembly fitting points based on the tolerance analysis model, including: determining the tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the assembly data distribution pattern of the corresponding components after assembly during the production process in the historical time period according to the tolerance analysis model; completing the initial assembly according to the assembly fitting points, calculating whether the position of each component in the current assembly state meets the tolerance and the assembly data distribution pattern, and if not, adjusting the assembly angle of the corresponding component according to the preset step size until the corresponding tolerance and the assembly data distribution pattern are met, thereby obtaining the target assembly scheme, wherein the target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the assembly data distribution pattern.

[0109] In one embodiment, the tolerance allocation module 192 is further configured to perform physical assembly based on the target assembly scheme and the position adjustment range, including: configuring the direction adjustment amount of the connection point of the corresponding target component according to the position adjustment range; configuring the pre-tightening positioning fixture and pre-tightening sequence of each component based on the direction adjustment amount; tightening according to the pre-tightening fixture and pre-tightening sequence; measuring the rear overhang parameter according to the preset measuring points of the corresponding component; and determining the adjustment sequence of each component according to the measurement results to meet the assembly tolerance.

[0110] The aforementioned simulation-based rear suspension parameter adjustment system can be implemented as a computer program, which can be used in various ways, such as... Figure 20 The computer device shown runs on the computer. The computer device includes: memory, processor, and computer programs stored in the memory and executable on the processor.

[0111] The modules in the simulation-based rear suspension parameter adjustment system described above can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the terminal's memory in hardware form, or stored in the terminal's memory in software form, so that the processor can call and execute the corresponding operations of each module. The processor can be a central processing unit (CPU), a microprocessor, a microcontroller, etc.

[0112] like Figure 20 The diagram shown is a schematic representation of the internal structure of a computer device in one embodiment. A computer device is provided, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it performs the following steps: acquiring target components associated with each rear overhang parameter; constructing an assembly structure tree based on the connection points of the target components, the assembly structure tree representing the composition and assembly sequence of different target components; determining the assembly fitting points of each component and its corresponding target component based on the assembly structure tree; constructing a tolerance analysis model based on the assembly fitting points; performing assembly iteration on each assembly fitting point based on the tolerance analysis model, such that the assembly tolerance of each assembly fitting point satisfies a preset tolerance constraint, thereby obtaining a target assembly scheme and the position adjustment range of the target components based on the corresponding connection points; and performing physical assembly based on the target assembly scheme and the position adjustment range.

[0113] In one embodiment, before the processor executes the acquisition of the target components associated with each rear suspension parameter, it further includes: acquiring the directional displacement of the connection points of each component in a preset mechanical motion model, wherein the mechanical motion model is obtained by simulation based on the chassis suspension structure; and determining the components associated with each rear suspension parameter as the target components based on the change in the corresponding rear suspension parameter under the action of the directional displacement.

[0114] In one embodiment, the target components in the mechanical motion model include: a vehicle body, a rear subframe, an upper control arm, a lower control arm, a toe-in adjustment rod, a camber adjustment rod, a rear steering knuckle, a shock absorber, a shock absorber, and a tire; the tire and the rear steering knuckle are connected to form an integral structure; the rear steering knuckle is ball-connected to the upper control arm, the lower control arm, the toe-in adjustment rod, and the camber adjustment rod via multiple connection points on its inner side through connecting bushings; the lower control arm and the rear subframe are connected through a predetermined connection point between the lower control arm and the rear subframe; the rear subframe and the vehicle body are connected through a predetermined connection point between the rear subframe and the vehicle body; the shock absorber and the shock absorber are disposed between the rear subframe and the vehicle body.

[0115] In one embodiment, when the processor executes the above-mentioned process, the implemented rear suspension parameters include: rear wheel toe angle and rear wheel camber angle. The components associated with each rear suspension parameter are determined based on the change in the corresponding rear suspension parameter under the action of the directional displacement. This includes: applying directional displacements in multiple preset directions to the connection points of each component in the mechanical motion model; recording the changes in the rear wheel toe angle and rear wheel camber angle when each component connection point reaches the corresponding directional displacement; and designating the component at the connection point where the change exceeds a preset threshold as the component associated with the rear wheel toe angle or the rear wheel camber angle.

[0116] In one embodiment, when the processor executes the above-mentioned method, the assembly structure tree constructed based on the connection points of the target component includes: obtaining the assembly process of each component in the mechanical motion model; taking the target component as a parent node and determining the child nodes associated with the parent node according to the assembly process; and obtaining the assembly structure tree according to the association relationship between the parent node and the child nodes.

[0117] In one embodiment, when the processor executes the above-mentioned process, the process of determining the assembly fitting point between each component and the corresponding target component based on the assembly structure tree includes: using the connection point of the target component in the assembly structure tree as a constraint point, determining the contact point between each component and the corresponding target component based on the constraint point; determining the constraint direction of the contact point based on the change in the rear overhang parameter, so as to construct the assembly fitting point of the corresponding target component based on the contact point and the corresponding constraint direction.

[0118] In one embodiment, before the processor performs assembly iterations based on the tolerance analysis model for each assembly fitting point, the process further includes: determining the parts that need to be positioned in the assembly structure tree based on historical assembly data; obtaining a preset virtual positioning fixture for the parts that need to be positioned, and performing assembly iterations based on the preset virtual positioning fixture.

[0119] In one embodiment, when the processor executes the above-mentioned process, the assembly iteration based on the tolerance analysis model for each assembly fitting point includes: determining the tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the assembly data distribution pattern of the corresponding components after assembly during the production process in the historical time period according to the tolerance analysis model; completing the initial assembly according to the assembly fitting point, calculating whether the position of each component in the current assembly state meets the tolerance and the assembly data distribution pattern, and if not, adjusting the assembly angle of the corresponding component according to the preset step size until the corresponding tolerance and the assembly data distribution pattern are met, thereby obtaining the target assembly scheme, wherein the target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the assembly data distribution pattern.

[0120] In one embodiment, when the processor executes the above-mentioned assembly, the physical assembly based on the target assembly scheme and the position adjustment range includes: configuring the direction adjustment amount of the connection point of the corresponding target component according to the position adjustment range; configuring the pre-tightening positioning fixture and pre-tightening sequence of each component based on the direction adjustment amount; fastening according to the pre-tightening fixture and pre-tightening sequence; measuring the rear overhang parameter according to the preset measuring points of the corresponding component; and determining the adjustment sequence of each component according to the measurement results to meet the assembly tolerance.

[0121] In one embodiment, the aforementioned computer device can be used as a server, including but not limited to a standalone physical server or a server cluster consisting of multiple physical servers. The computer device can also be used as a terminal, including but not limited to mobile phones, tablets, personal digital assistants, or smart devices. Figure 20 As shown, the computer device includes a processor, non-volatile storage medium, internal memory, display screen, and network interface connected via a system bus.

[0122] The processor of this computer device provides computing and control capabilities to support the operation of the entire device. The non-volatile storage medium of the computer device stores the operating system and computer programs. These programs can be executed by the processor to implement the simulation-based rear suspension parameter adjustment method provided in the various embodiments above. The internal memory of the computer device provides a cached runtime environment for the operating system and computer programs stored in the non-volatile storage medium. The display interface can display data via a screen. The screen can be a touchscreen, such as a capacitive or electronic screen, and can generate corresponding instructions by receiving clicks on controls displayed on the touchscreen.

[0123] Those skilled in the art will understand that Figure 20The structure of the computer device shown in the figure is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0124] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon. When executed by a processor, the computer program performs the following steps: acquiring target components associated with each rear overhang parameter; constructing an assembly structure tree based on the connection points of the target components, the assembly structure tree being used to characterize the composition and assembly sequence of different target components; determining the assembly fitting points of each component and its corresponding target component based on the assembly structure tree; constructing a tolerance analysis model based on the assembly fitting points; performing assembly iteration on each assembly fitting point based on the tolerance analysis model, such that the assembly tolerance of each assembly fitting point satisfies a preset tolerance constraint, thereby obtaining a target assembly scheme and the position adjustment range of the target components based on the corresponding connection points; and performing physical assembly based on the target assembly scheme and the position adjustment range.

[0125] In one embodiment, when the computer program is executed by the processor, before acquiring the target component associated with each rear suspension parameter, the program further includes: acquiring the directional displacement of the connection points of each component in a preset mechanical motion model, wherein the mechanical motion model is obtained by simulation based on the chassis suspension structure; and determining the component associated with each rear suspension parameter as the target component based on the change in the corresponding rear suspension parameter under the action of the directional displacement.

[0126] In one embodiment, the target components in the mechanical motion model include: a vehicle body, a rear subframe, an upper control arm, a lower control arm, a toe-in adjustment rod, a camber adjustment rod, a rear steering knuckle, a shock absorber, a shock absorber, and a tire; the tire and the rear steering knuckle are connected to form an integral structure; the rear steering knuckle is ball-connected to the upper control arm, the lower control arm, the toe-in adjustment rod, and the camber adjustment rod via multiple connection points on its inner side through connecting bushings; the lower control arm and the rear subframe are connected through a predetermined connection point between the lower control arm and the rear subframe; the rear subframe and the vehicle body are connected through a predetermined connection point between the rear subframe and the vehicle body; the shock absorber and the shock absorber are disposed between the rear subframe and the vehicle body.

[0127] In one embodiment, when the computer program is executed by the processor, the implemented rear suspension parameters include: rear wheel toe angle and rear wheel camber angle. The program determines the components associated with each rear suspension parameter based on the change in the corresponding rear suspension parameter under the action of the directional displacement, including: applying directional displacement in multiple preset directions to the connection points of each component in the mechanical motion model; recording the changes in the rear wheel toe angle and rear wheel camber angle when each component connection point reaches the corresponding directional displacement; and designating the component at the connection point where the change exceeds a preset threshold as the component associated with the rear wheel toe angle or the rear wheel camber angle.

[0128] In one embodiment, when the computer program is executed by a processor, the implementation of constructing an assembly structure tree based on the connection points of the target component includes: obtaining the assembly process of each component in the mechanical motion model; taking the target component as a parent node and determining the child nodes associated with the parent node according to the assembly process; and obtaining the assembly structure tree according to the association relationship between the parent node and the child nodes.

[0129] In one embodiment, when the computer program is executed by the processor, the process of determining the assembly fitting points of each component and the corresponding target component based on the assembly structure tree includes: using the connection points of the target components in the assembly structure tree as constraint points, determining the contact points of each component and the corresponding target component based on the constraint points; determining the constraint direction of the contact points based on the change in the rear overhang parameter, so as to construct the assembly fitting points of the corresponding target components based on the contact points and the corresponding constraint directions.

[0130] In one embodiment, when the instruction is executed by the processor, before performing assembly iteration on each of the assembly fitting points based on the tolerance analysis model, the method further includes: determining the parts that need to be positioned in the assembly structure tree based on historical assembly data; obtaining a preset virtual positioning fixture for the parts that need to be positioned, and performing assembly iteration based on the preset virtual positioning fixture.

[0131] In one embodiment, when the instruction is executed by the processor, the assembly iteration based on the tolerance analysis model for each assembly fitting point includes: determining the tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the assembly data distribution pattern of the corresponding components after assembly during the production process in the historical time period according to the tolerance analysis model; completing the initial assembly according to the assembly fitting points; calculating whether the position of each component in the current assembly state meets the tolerance and the assembly data distribution pattern; if not, adjusting the assembly angle of the corresponding component according to the preset step size until the corresponding tolerance and the assembly data distribution pattern are met, thereby obtaining the target assembly scheme, wherein the target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the assembly data distribution pattern.

[0132] In one embodiment, when the instruction is executed by the processor, the physical assembly based on the target assembly scheme and the position adjustment range includes: configuring the direction adjustment amount of the connection point of the corresponding target component according to the position adjustment range; configuring the pre-tightening positioning fixture and pre-tightening sequence of each component based on the direction adjustment amount; fastening according to the pre-tightening fixture and pre-tightening sequence; measuring the rear overhang parameter according to the preset measuring points of the corresponding component; and determining the adjustment sequence of each component according to the measurement results to meet the assembly tolerance.

[0133] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), etc.

[0134] 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 simulation-based method for adjusting rear suspension parameters, characterized in that, include: Obtain the target components associated with each rear overhang parameter, and construct an assembly structure tree based on the connection points of the target components. The assembly structure tree is used to characterize the composition and assembly sequence of the different target components. The assembly fitting points between each component and its corresponding target component are determined based on the assembly structure tree. A tolerance analysis model is constructed based on the assembly fitting points. Assembly iteration is performed on each assembly fitting point based on the tolerance analysis model so that the assembly tolerance of each assembly fitting point meets the preset tolerance constraints. In this way, the target assembly scheme and the position adjustment range of the target parts based on the corresponding connection points are obtained. The physical assembly is then performed based on the target assembly scheme and the position adjustment range. Based on the tolerance analysis model, assembly iteration is performed on each of the assembly fitting points, including: The tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the assembly data distribution pattern of the corresponding components after assembly during the production process in the historical time period are determined according to the tolerance analysis model. The initial assembly is completed according to the assembly fitting point. The position of each component in the current assembly state is calculated to meet the tolerance and the assembly data distribution pattern. If not, the assembly angle of the corresponding component is adjusted according to the preset step size until the corresponding tolerance and the assembly data distribution pattern are met, and the target assembly scheme is obtained. The target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the assembly data distribution pattern.

2. The simulation-based rear suspension parameter adjustment method according to claim 1, characterized in that, Before obtaining the target components associated with each rear suspension parameter, the following steps are also included: Obtain the directional displacement of each component connection point in the preset mechanical motion model, wherein the mechanical motion model is obtained by simulation based on the chassis suspension structure; The components associated with each rear suspension parameter are determined as the target components based on the change in the corresponding rear suspension parameter under the action of the displacement in the stated direction.

3. The simulation-based rear suspension parameter adjustment method according to claim 2, characterized in that, The target components in the mechanical motion model include: vehicle body, rear subframe, upper control arm, lower control arm, toe-in adjuster, camber adjuster, rear steering knuckle, shock absorber spring, shock absorber, and tires; The tire and the rear steering knuckle are connected to form an integral structure; The rear horn is connected to the upper control arm, the lower control arm, the toe-adjusting rod, and the camber-adjusting rod via multiple connection points on its inner side through connecting bushings. The connection between the lower control arm and the rear subframe is established through a predetermined connection point between the lower control arm and the rear subframe; The connection between the rear subframe and the vehicle body is established through a preset connection point between the rear subframe and the vehicle body; The shock-absorbing spring and the shock absorber are disposed between the rear subframe and the vehicle body.

4. The simulation-based rear suspension parameter adjustment method according to claim 2, characterized in that, The rear suspension parameters include: rear wheel toe angle and rear wheel camber angle. The components associated with each rear suspension parameter are determined based on the change in the corresponding rear suspension parameter under the action of displacement in the stated direction, including: Multiple preset directional displacements are applied to the connection points of each component in the mechanical motion model. Record the changes in the rear wheel toe angle and rear wheel camber angle when each component connection point reaches the corresponding displacement in the direction; When the change exceeds a preset threshold, the component at the corresponding connection point is used as the component associated with the rear wheel toe angle or the rear wheel camber angle.

5. The simulation-based rear suspension parameter adjustment method according to claim 3, characterized in that, An assembly structure tree is constructed based on the connection points of the target components, including: Obtain the assembly process of each component in the mechanical motion model; The target component is taken as the parent node, and the child nodes associated with the parent node are determined according to the assembly process; The assembly structure tree is obtained based on the association between the parent node and the child node.

6. The simulation-based rear suspension parameter adjustment method according to claim 5, characterized in that, Based on the assembly structure tree, the assembly fitting points between each component and its corresponding target component are determined, including: The connection points of the target components in the assembly structure tree are used as constraint points, and the contact points between each component and the corresponding target component are determined based on the constraint points. The constraint direction of the contact point is determined based on the change in the rear overhang parameters, so as to construct the assembly fitting point of the corresponding target component based on the contact point and the corresponding constraint direction.

7. The simulation-based rear suspension parameter adjustment method according to claim 6, characterized in that, Before performing assembly iterations on each assembly fitting point based on the tolerance analysis model, the process further includes: The components that need to be positioned are determined in the assembly structure tree based on historical assembly data; Obtain a preset virtual positioning fixture for the component that needs to be positioned, and perform assembly iteration based on the preset virtual positioning fixture.

8. The simulation-based rear suspension parameter adjustment method according to claim 7, characterized in that, Based on the tolerance analysis model, assembly iteration is performed on each of the assembly fitting points, including: The tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the distribution of assembly data after the corresponding components are assembled during the production process in the historical time period are determined based on the tolerance analysis model. The initial assembly is completed based on the assembly fitting point. The position of each component in the current assembly state is calculated to see if it meets the tolerance and the distribution pattern of the assembly data. If it does not meet the tolerance, the assembly angle of the corresponding component is adjusted according to the preset step size until the corresponding tolerance and the distribution pattern of the assembly data are met, and the target assembly scheme is obtained. The target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the distribution pattern of the assembly data.

9. The simulation-based rear suspension parameter adjustment method according to claim 8, characterized in that, Based on the target assembly scheme and the position adjustment range, physical assembly is performed, including: Configure the direction adjustment amount of the connection point of the corresponding target component according to the position adjustment range; Based on the aforementioned directional adjustment amount, configure the pre-tightening positioning fixtures and pre-tightening sequence for each component; Tighten the components according to the pre-tightening fixture and the pre-tightening sequence, and measure the rear overhang parameters according to the preset measuring points of the corresponding components. Determine the adjustment sequence of each component based on the measurement results to meet the assembly tolerance.

10. A simulation-based rear suspension parameter adjustment system, characterized in that, include: An assembly tree construction module is used to obtain target components associated with each rear overhang parameter, and to construct an assembly tree structure based on the connection points of the target components. The assembly tree structure is used to characterize the composition and assembly order of the different target components. The fitting point acquisition module is used to determine the assembly fitting points between each component and the corresponding target component based on the assembly structure tree. The tolerance allocation module is used to construct a tolerance analysis model based on the assembly fitting points, and to perform assembly iteration on each assembly fitting point based on the tolerance analysis model, so that the assembly tolerance of each assembly fitting point meets the preset tolerance constraints, thereby obtaining the target assembly scheme and the position adjustment range of the target parts based on the corresponding connection points, and to perform physical assembly based on the target assembly scheme and the position adjustment range. Assembly iteration is performed on each assembly fitting point based on the tolerance analysis model, including: determining the tolerances of each component in the assembly structure tree, the tolerances of the preset virtual positioning fixture, and the assembly data distribution pattern of the corresponding components after assembly during the production process in the historical time period according to the tolerance analysis model; completing the initial assembly according to the assembly fitting point, calculating whether the position of each component in the current assembly state meets the tolerance and the assembly data distribution pattern, and if not, adjusting the assembly angle of the corresponding component according to the preset step size until the corresponding tolerance and the assembly data distribution pattern are met, thereby obtaining the target assembly scheme, wherein the target assembly scheme includes the position adjustment range of the target component in meeting the tolerance and the assembly data distribution pattern.

11. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the computer program, it implements the steps of the simulation-based rear suspension parameter adjustment method according to any one of claims 1 to 9.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the simulation-based rear suspension parameter adjustment method according to any one of claims 1 to 9.

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