Wire harness physical topology planning optimization method and system based on signal loop

Abstract

The invention discloses a wire harness physical topology planning optimization method and system based on a signal loop. The method comprises the following steps: S1, obtaining a whole vehicle wire harness signal laying diagram; s2, selecting a node with the largest number of loop signals connected in the whole vehicle wiring harness diagram as a root node; s3, identifying all loop signals connected with the root node to obtain a first signal set; s4, establishing a constraint condition, and screening out a second signal set from the first signal set; s5, establishing a first-generation physical topological graph for calculating the root node and related nodes thereof; s6, obtaining the number of loop signals connected with related nodes of the root node; s7, performing iterative calculation to obtain an optimal physical topological graph of a single branch; and S8, forming a physical topological graph of the optimal wire harness of the whole vehicle. According to the method, the assemblability of the whole vehicle wire harness and the whole vehicle space environment boundary are considered, and the finally obtained whole vehicle complete wire harness physical topological graph can better fit the actual situation.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive wiring harness design, and particularly relates to a method and system for optimizing the physical topology planning of a wiring harness based on a signal loop. Background Art

[0002] Currently, vehicle lightweighting has greatly improved the economy, power performance, safety, braking performance, and emissions of the entire vehicle. Research shows that if the vehicle weight is reduced by 10%, the fuel consumption of a fuel vehicle can be reduced by 6-8%; for every 100 kg reduction in vehicle weight, the fuel consumption per 100 km of a fuel vehicle can be reduced by 0.3-0.6 L, and the CO2 emissions can be reduced by approximately 5 g / km; the power consumption of an electric vehicle can be reduced by 0.4 kWh / 100 km, and the cruising range can be increased by approximately 13 km. In addition, for every 100 kg reduction in vehicle weight, the acceleration time from 0 to 100 km / h can be reduced by 0.3-0.5 s, the handling sensitivity can be improved, and at the same time, the intrusion of the front end during a collision can be reduced, and the braking distance can be shortened. The research on vehicle lightweighting has become a hot topic in the industry. With the increase in automotive electrical functions, the wiring harness, as a bridge connecting various electrical systems, has become increasingly complex, and the wiring harness branches have become heavier and thicker. The existing technology requires manual planning of the physical topology of the wiring harness. According to statistics, the wiring harness usage of a B-class vehicle has reached 1.5-2 km, with a weight of about 25 kg.

[0003] The Chinese invention patent with publication number CN115465204A discloses a method for lightweight design of an automotive wire harness; including optimizing the wiring harness topology structure, optimizing the electrical component layout and principle control scheme, optimizing the accessory selection, optimizing the materials, and optimizing the process to reduce the wiring harness weight. For various lightweight solutions in the wiring harness design process, an evaluation method for whether to implement finally is provided, and it is judged and evaluated through the lightweight price-to-weight ratio and the product technology maturity. The present invention can effectively reduce the wiring harness weight and provide a practical evaluation method. The wiring harness topology structure optimization method of this application is to arrange the electric tailgate controller at the left rear of the vehicle, change the wiring direction of the right strut wiring harness, and reduce the wiring harness detour distance. However, this solution only optimizes the wiring harness topology structure from the means of reducing the wiring harness segments, without considering the assemblability of the entire vehicle wiring harness and the boundary of the entire vehicle space environment, which easily leads to problems such as non-assemblability or large space occupation in the final optimized structure.

[0004] The Chinese invention patent with the publication number CN113343349B discloses a multi-objective optimization method, device and storage medium for an automotive electronic and electrical architecture. The method includes: determining the constraint conditions and the objective function of the wiring harness layer, establishing a wiring harness layer optimization model with the constraint conditions of the wiring harness layer as constraints and the objective function of the wiring harness layer as the objective; determining the constraint conditions and the objective function of the controller topology layer, establishing a controller topology layer optimization model with the constraint conditions of the controller topology layer as constraints and the objective function of the controller topology layer as the objective; according to the preset automotive electronic and electrical parameters, using the NSGA-Ⅲ method to solve the wiring harness layer optimization model and the controller topology layer optimization model respectively to obtain the Pareto optimal solution set of the objective function of the wiring harness layer and the Pareto optimal solution set of the objective function of the controller topology layer. The indicators involved in the objective function in this application are used as constraint conditions, reducing the amount of previous calculations and only achieving the purpose of improving the overall work efficiency.

[0005] The Chinese invention patent with the publication number CN115758589A discloses a lightweight wiring harness design method, including: S1, aiming at the lightweight design of the wiring harness, optimizing the wiring of electrical components, the architecture of component models, the network architecture, and the definition of wiring harness interfaces; S2, selecting the optimal wiring harness topology structure for lightweight wiring harness under the premise allowed by the vehicle production process; S3, taking the straight connection between electrical components as the optimal connection method to find the layout positions of electrical components, and then determining the layout positions, docking positions and grounding point positions of the connecting wiring harness between electrical components according to the layout positions of electrical components; S4, when the maximum current carrying capacity of the material meets the design requirements, selecting the wiring harness connector with the minimum weight and the wiring harness wire with the minimum wire diameter; selecting the winding method of the tape for preventing leakage of wiring harness terminals as the flower winding or dot winding method for reducing the weight of the wiring harness; S5, aiming at reducing the process margin of the wire, optimizing the placement order of the wiring harness during production and the punching point positions of the wiring harness drawings; S6, aiming at reducing the weight, replacing the copper wire with an aluminum wire and changing the connection method between wiring harnesses to ribbon connection. The optimization method of the wiring harness topology structure in this application calculates the best layout position by calculating the copper weight. However, this scheme also starts from the means of reducing the wiring harness segments to optimize the wiring harness topology structure, without considering the assemblability of the vehicle wiring harness and the vehicle space environment boundary, which is likely to cause problems such as non-assemblability or large space occupation in the final optimized structure.

[0006] Therefore, there is an urgent need to propose a new solution to solve the above problems. Summary of the Invention

[0007] The present invention provides a method and system for optimizing the physical topology planning of a wire harness based on a signal loop to solve the problem in the prior art that when optimizing the wire harness topology structure, the assemblability of the vehicle wire harness and the boundary of the vehicle space environment are not considered, which easily leads to the problem that the final optimized structure is either unassemblable or occupies a large space.

[0008] The present invention provides a method for optimizing the physical topology planning of a wire harness based on a signal loop, including the following steps:

[0009] S1. Map all signal loops and electrical equipment in the vehicle electrical schematic diagram to the vehicle data to obtain a vehicle wire harness signal laying diagram;

[0010] S2. Select the node with the largest number of connected loop signals in the vehicle wire harness diagram as the root node;

[0011] S3. Identify all loop signals connected to the root node to obtain a first signal set, where the first signal set includes at least a first loop signal and its corresponding signal number;

[0012] S4. Establish constraint conditions and screen out a second signal set from the first signal set, where the second signal set includes at least a second loop signal and its corresponding signal number;

[0013] S5. Establish an objective function for the wire harness weight C min and input the second loop signal set into the objective function to calculate the first-generation physical topology diagram of the root node and its related nodes;

[0014] S6. Obtain the number of loop signals connected to the related nodes of the root node. If the number is greater than 0, the corresponding related node is denoted as the first node; if the number is equal to 0, the corresponding related node is denoted as the second node;

[0015] S7. For the first node, identify all loop signals connected to the first node to obtain a new first signal set, and perform iterative calculations according to the above S4 - S6 until it is determined that all related nodes are second nodes, then obtain the optimal physical topology diagram of a single branch;

[0016] S8. Repeat the above S2 - S7 to obtain physical topology diagrams of multiple branches and form an optimal wire harness physical topology diagram of the whole vehicle.

[0017] Further, the constraint conditions include: the assemblability of the vehicle wire harness means that the physical topology of the wire harness is an open-loop topology structure, and for any two loop signals S k-ij and S l-ij between any two connected nodes i and j, the paths must have overlapping parts.

[0018] Furthermore, the constraint conditions further include the boundary of the vehicle's overall space environment:

[0019] For any loop signal S between any two connected nodes i and j in a single loop k-ij the path is P k-ij , the path P k-ij has minimum clearances of α, β, and γ respectively from the general environment, vibration environment, and high-temperature environment around the vehicle. Among them, S k-ij represents the k-th loop signal connecting nodes i and j; α, β, and γ can be obtained by detection using clearance calculation software based on the path P k-ij .

[0020] Furthermore, α, β, and γ respectively need to satisfy the following formulas:

[0021]

[0022] Furthermore, the objective function is:

[0023]

[0024] where L k-ij is the length of the path P k-ij , M k-ij is the weight per unit length of the loop signal S k-ij , and t is the number of loop signals connecting nodes i and j.

[0025] Furthermore, after repeating the above S2 - S7 to obtain multiple branch physical topology diagrams and forming the optimal vehicle wiring harness physical topology diagram, the following steps are further included:

[0026] Verify the complete vehicle wiring harness physical topology diagram through software.

[0027] Furthermore, mapping all signal loops and electrical devices in the vehicle electrical schematic diagram to the vehicle data to obtain the vehicle wiring harness signal laying diagram includes:

[0028] The vehicle data is obtained from the 3D digital model. In the vehicle wiring harness diagram, an electrical device serves as a node, and the spatial position of each electrical device in the vehicle wiring harness diagram is determined and identifiable; the electrical property values of the interfaces where each node is connected to the wiring harness are defined. When mapping the loop signals in the vehicle electrical schematic diagram to the 3D digital model according to the electrical property values of the nodes, the nodes related to them can be identified, and the loops related to the interfaces are also determined in the vehicle electrical schematic diagram.

[0029] The present invention also provides a wiring harness physical topology planning and optimization system based on signal loops, including:

[0030] A vehicle wiring harness signal laying diagram acquisition module, which is used to map all signal loops and electrical equipment in the vehicle electrical schematic diagram into vehicle data to obtain the vehicle wiring harness signal laying diagram;

[0031] A first signal set acquisition module, which is used to select the node with the largest number of loop signals connected in the vehicle wiring harness diagram as the root node, and identify all loop signals connected to the root node to obtain a first signal set;

[0032] A second signal set acquisition module, which is used to establish constraint conditions and screen out a second signal set from the first signal set;

[0033] A first-generation physical topology diagram acquisition module, which is used to establish an objective function of the wiring harness weight C min and input the second loop signal set into the objective function to calculate the first-generation physical topology diagram of the root node and its related nodes;

[0034] A single-branch optimal physical topology diagram acquisition module, which is used to obtain the number of loop signals connected to the related nodes of the root node through iterative calculation until it is determined that the number of loop signals connected to all related nodes is 0, so as to obtain a single-branch optimal physical topology diagram;

[0035] A vehicle optimal wiring harness physical topology diagram acquisition module, which is used to obtain the vehicle optimal wiring harness physical topology diagram through the single-branch optimal physical topology diagram acquisition module.

[0036] Compared with the prior art, the wiring harness physical topology planning and optimization method based on signal loops of the present invention screens the second signal set in the early stage of calculation, and then establishes an objective function of the wiring harness weight C min Considering the assemblability of the vehicle wiring harness and the vehicle space environment boundary, the finally obtained complete vehicle wiring harness physical topology diagram can be more in line with the actual situation, that is, while optimizing the wiring harness path, the actual assemblability is guaranteed. Compared with the manual planning of the wiring harness physical topology in the prior art, the design efficiency can be increased by 30%, and the average material cost per vehicle can be reduced by 2.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is the vehicle wiring harness diagram of the present invention;

[0038] Figure 2 It is the structural schematic diagram of the first node and the second node of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To further understand the content, features and effects of the present invention, the following embodiments are given and are accompanied by the attachedFigure 1 and 2 The detailed description is as follows.

[0040] As Figure 1 and 2 shown, this embodiment provides a method for optimizing the physical topology planning of a wire harness based on a signal loop, including the following steps:

[0041] S1. Map all signal loops and electrical devices in the vehicle electrical schematic diagram to the vehicle data to obtain a vehicle wire harness signal laying diagram;

[0042] S2. Select the node with the largest number of loop signals connected in the vehicle wire harness diagram as the root node;

[0043] S3. Identify all loop signals connected to the root node to obtain a first signal set, where the first signal set includes at least a first loop signal and its corresponding signal number;

[0044] S4. Establish constraint conditions and screen out a second signal set from the first signal set, where the second signal set includes at least a second loop signal and its corresponding signal number;

[0045] S5. Establish an objective function for the wire harness weight C min , input the second loop signal set into the objective function, and calculate the first-generation physical topology diagram of the root node and its related nodes;

[0046] S6. Obtain the number of loop signals connected to the related nodes of the root node. If the number is greater than 0, the corresponding related node is denoted as the first node; if the number is equal to 0, the corresponding related node is denoted as the second node. As Figure 1 shown;

[0047] S7. For the first node, identify all loop signals connected to the first node to obtain a new first signal set, and perform iterative calculations according to the above S4 - S6 until it is determined that all related nodes are second nodes, then obtain the optimal physical topology diagram of a single branch. If it is determined that the related nodes of a certain first node except for the signals related to the root node are second nodes, then obtain the physical topology of a single branch connected by the first node and the related second node. The meaning of the physical topology of a single branch is that there is only one path topology for all signals between nodes, that is, there is no branch in the middle;

[0048] S8. Repeat the above S2 - S7 to obtain physical topology diagrams of multiple branches and form an optimal physical topology diagram of the vehicle wire harness.

[0049] The method for optimizing the physical topology planning of a wire harness based on a signal loop of the present invention screens the second signal set in the early stage of calculation, and then establishes the wire harness weight Cmin The objective function, considering the assemblability of the vehicle's wiring harness and the boundary of the vehicle's space environment, enables the final complete physical topology diagram of the vehicle's wiring harness to better conform to the actual situation. That is, while optimizing the wiring harness path, it ensures actual assemblability. Compared with the manual planning of the physical topology of the wiring harness in the prior art, it can improve the design efficiency by 30% and reduce the average material cost per vehicle by 2.5%.

[0050] When the electrical property value is used to map the loop signals in the vehicle's electrical schematic diagram into the digital model, the nodes related to it are identified according to the electrical property value of the node. It can be understood that the electrical property value is the key for connecting the node interfaces of the loop signals in the 3D digital model. The vehicle's electrical schematic diagram has loop signals, corresponding signal numbers, and wire specifications for the corresponding signals; the wire specifications of the loop signals are constants. The vehicle's electrical schematic diagram also includes paths, the lengths of the paths, and the weight per unit length of the loop signals.

[0051] In the vehicle's wiring harness diagram, an electrical device is regarded as a node. The spatial position of each electrical device in the vehicle's wiring harness diagram is determined and can be identified. The interface where each node is connected to the wiring harness has a defined electrical property value, and the relevant loops of the interface are also determined in the vehicle's electrical schematic diagram.

[0052] As Figure 1 shown, at the middle red box A is the root node, at the green box B is the first node, and at the blue box C is the second node.

[0053] As Figure 2 shown, among them, the three second nodes and the single first node are all single branches, and the three single branches form the single-branch physical topology diagram of the first node. The specific number of signals between the nodes is confirmed according to the electrical schematic diagram. The method for judging relevant nodes: S1. Find all the nodes (except the root node) that have signal connections with the first node according to the electrical schematic diagram; S2. Then check whether the nodes connected to other signals (not connected to the first node) of each relevant node that has a signal connection with the first node are the first node. If none of them are the first node, they are the second nodes. Among them, the relevant nodes of the root node are only the first node, and the relevant nodes of the first node are the root node and the second node.

[0054] In this embodiment, the constraint conditions include: the assemblability of the vehicle's wiring harness means that the physical topology of the wiring harness is an open-loop topology structure. For any two loop signals S k-ij and S l-ij between any two connected nodes i and node j, the paths must have overlapping parts.

[0055] In this embodiment, the constraint conditions also include the boundary of the vehicle's space environment:

[0056] For any loop signal S between any two connected nodes i and j in a single loop k-ij the path is P k-ij The path P k-ij The minimum clearances from the ordinary environment, vibration environment, and high-temperature environment around the vehicle body are α, β, and γ respectively. Among them, S k-ij represents the kth loop signal connecting nodes i and j; α, β, and γ can be detected by clearance calculation software according to the path P k-ij and obtained

[0057] In this embodiment, α, β, and γ respectively need to satisfy the following formulas:

[0058]

[0059] In this embodiment, the objective function is:

[0060]

[0061] where L k-ij is the length of the path P k-ij M k-ij is the weight per unit length of the loop signal S k-ij and t is the number of loop signals connecting nodes i and j

[0062] In this embodiment, after repeating the above S2 to S7 to obtain multiple branch physical topology diagrams and forming the optimal vehicle body wiring harness physical topology diagram, the following steps are further included:

[0063] Verify the complete vehicle body wiring harness physical topology diagram through software

[0064] In this embodiment, mapping all signal loops and electrical devices in the vehicle body electrical schematic diagram to the vehicle body data to obtain the vehicle body wiring harness signal laying diagram includes:

[0065] The vehicle body data is obtained from a 3D digital model. In the vehicle body wiring harness diagram, an electrical device serves as a node, and the spatial position of each electrical device in the vehicle body wiring harness diagram is determined and recognizable; the electrical attribute values of the interfaces where each node is connected to the wiring harness are defined. When mapping the loop signals in the vehicle body electrical schematic diagram to the 3D digital model according to the electrical attribute values of the nodes, the nodes related to the interfaces can be identified, and the relevant loops of the interfaces are also determined in the vehicle body electrical schematic diagram

[0066] The present invention also provides a wiring harness physical topology planning and optimization system based on signal loops, including:

[0067] The vehicle wiring harness signal laying diagram acquisition module is used to map all signal circuits and electrical equipment in the vehicle electrical schematic diagram to the vehicle data, and the vehicle wiring harness signal laying diagram;

[0068] The first signal set acquisition module is used to select the node with the largest number of loop signals connected in the vehicle wiring harness diagram as the root node, and identify all loop signals connected to the root node to obtain the first signal set;

[0069] The second signal set acquisition module is used to establish constraint conditions and screen out the second signal set from the first signal set;

[0070] The first-generation physical topology diagram acquisition module is used to establish the objective function of the wiring harness weight C min and input the second loop signal set into the objective function to calculate the first-generation physical topology diagram of the root node and its related nodes;

[0071] The single-branch optimal physical topology diagram acquisition module is used to obtain the number of loop signals connected to the related nodes of the root node through iterative calculation until it is determined that the number of loop signals connected to all related nodes is 0, and obtain the single-branch optimal physical topology diagram;

[0072] The vehicle optimal wiring harness physical topology diagram acquisition module is used to obtain the vehicle optimal wiring harness physical topology diagram through the single-branch optimal physical topology diagram acquisition module.

[0073] The above-mentioned invention only expresses the implementation manners of the embodiments of the present invention, and thus cannot be understood as a limitation on the scope of the invention patent, nor is it a limitation on the structure of the embodiments of the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present invention, several changes and improvements can still be made, and these all belong to the protection scope of the embodiments of the present invention.

Claims

1. A signal loop-based wiring harness physical topology planning optimization method, characterized in that: The following steps are involved: S1. Map all signal loops and electrical equipment in the vehicle electrical schematic diagram to the vehicle data to obtain the vehicle wiring harness signal layout diagram; S2, select the node with the largest number of loop signals connected in the vehicle wiring harness diagram as the root node; S3, identifying all loop signals connected to the root node to obtain a first signal set, wherein the first signal set at least includes a first loop signal and a corresponding signal number; S4, establishing a constraint condition, filtering out a second signal set from the first signal set, where the second signal set at least includes a second loop signal and a corresponding signal number; S5. Establish the harness weight C min The objective function is input into the objective function to calculate the first generation physical topology graph of the root node and its related nodes; S6, obtaining the number of loop signals connected to the related nodes of the root node, if the number is greater than 0, the corresponding related node is recorded as the first node; If the quantity is equal to 0, the corresponding related node is recorded as the second node; S7, for the first node, identifying all loop signals connected to the first node, obtaining a new first signal set, and performing iterative calculations according to the above S4 to S6 until it is determined that all relevant nodes are second nodes, thereby obtaining an optimal physical topology diagram of a single branch; S8. Repeat the above steps S2 to S7 to obtain multiple branch physical topology diagrams, and form an optimal wiring harness physical topology diagram for the entire vehicle.

2. According to the signal loop-based wiring harness physical topology planning and optimization method of claim 1, it is characterized in that: The constraint conditions include: the assemblability of the vehicle wiring harness means that the physical topology of the wiring harness is an open-loop topology structure, and the open-loop topology structure is any two loop signals S between any two connected nodes i and j. k-ij and S l-ij The paths must overlap.

3. The signal loop-based wiring harness physical topology planning and optimization method according to claim 2, characterized in that: The constraints also include the vehicle space environment boundary: For any loop signal S between any two connected nodes i and j in a single loop k-ij The path is P k-ij , the path P k-ij The minimum values ​​of the gaps between the normal environment, vibration environment, and high temperature environment of the vehicle are α, β, and γ, respectively. k-ij It represents the kth loop signal connecting node i and node j; α, β, γ can be calculated by the gap calculation software according to the path P k-ij Detected.

4. The signal loop-based wiring harness physical topology planning and optimization method according to claim 3 is characterized in that: The α, β, and γ must satisfy the following formulas:

5. The signal loop-based wiring harness physical topology planning and optimization method according to claim 4, characterized in that: The objective function is: Where L k-ij For path P k-ij Length, M k-ij is the loop signal S k-ij The unit length weight, t is the number of loop signals connected between node i and node j.

6. The signal loop-based wiring harness physical topology planning and optimization method according to claim 1, characterized in that: After repeating the above steps S2 to S7 to obtain multiple branch physical topology diagrams and forming the optimal wiring harness physical topology diagram for the entire vehicle, the following steps are also included: The complete wiring harness physical topology of the vehicle is verified through software.

7. The signal loop-based wiring harness physical topology planning and optimization method according to claim 1, characterized in that: The method of mapping all signal loops and electrical equipment in the vehicle electrical schematic diagram to the vehicle data to obtain the vehicle wiring harness signal layout diagram includes: The whole vehicle data is obtained by a three-dimensional digital model. In the whole vehicle wiring harness diagram, an electrical device is regarded as a node. The spatial position of each electrical device in the whole vehicle wiring harness diagram is determined and identifiable. The interface connecting each node to the wiring harness has defined electrical attribute values. The electrical attribute values ​​are used to map the loop signals in the whole vehicle electrical schematic diagram into the three-dimensional digital model. The nodes related to the nodes are identified according to the electrical attribute values ​​of the nodes, and the related loops of the interfaces are also determined in the whole vehicle electrical schematic diagram.

8. A signal loop-based wiring harness physical topology planning and optimization system, characterized in that: include: The vehicle wiring harness signal layout diagram acquisition module is used to map all signal loops and electrical equipment in the vehicle electrical schematic diagram to the vehicle data and the vehicle wiring harness signal layout diagram; A first signal set acquisition module, used to select a node with the largest number of loop signals connected in the vehicle wiring harness diagram as a root node, identify all loop signals connected to the root node, and obtain a first signal set; A second signal set acquisition module, used to establish constraint conditions and filter out a second signal set from the first signal set; The first generation physical topology acquisition module is used to establish the harness weight C min The objective function is input into the objective function to calculate the first generation physical topology graph of the root node and its related nodes; A single branch optimal physical topology map acquisition module is used to obtain the number of loop signals connected to the nodes related to the root node through iterative calculation until it is determined that the number of loop signals connected to all related nodes is 0, thereby obtaining the single branch optimal physical topology map; The vehicle optimal wiring harness physical topology map acquisition module is used to obtain the vehicle optimal wiring harness physical topology map through a single branch optimal physical topology map acquisition module.

Images