Wiring harness end collocation optimization method and system based on loop signal laying

Abstract

The invention discloses a wire harness end collocation optimization method and system based on loop signal laying. The optimization method comprises the following steps: obtaining a complete wire harness physical topological graph of a whole vehicle; identifying a loop with at least one branch point in the wire harness physical topological graph and recording the loop as a first loop, and identifying a loop signal without a branch point in the whole vehicle electrical schematic diagram and recording the loop signal as a second loop; searching a first trunk and a plurality of first branches of each first loop in a wiring harness physical topological graph to obtain a first signal trunk set; establishing a constraint condition, and screening out a second signal trunk line set from the first signal trunk line set; obtaining the minimum total length of all the first branches connected with each first trunk; and obtaining a three-dimensional coordinate of the end collocation point of the corresponding first branch in the wire harness physical topological graph. According to the wire harness end distribution point optimization method based on loop signal laying, the position of the obtained three-dimensional coordinate of the end distribution point is more accurate, wire redundancy is avoided, and more cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle wiring harness design, and particularly to a wiring harness end-matching point optimization method and system based on loop signal laying. Background Art

[0002] Currently, with the increase in automotive electrical functions, the wiring harness, as a bridge connecting various electrical systems, has become increasingly complex. The traditional end-matching point positions are set by staff based on experience on the premise of meeting basic performance requirements. When the settings are unreasonable, it will lead to a large redundancy in the length of the branch wires connecting the end-matching points, resulting in cost waste.

[0003] The Chinese utility model patent with the publication number CN207339879U discloses a CAN bus physical topology verification system. This system consists of several communication nodes, a main line wiring harness, and branch line wiring harnesses. Each node consists of a processor, a communication rate selection button, a communication indicator light, a transceiver, a common mode inductor, a switch, and a terminal resistor; the CAN bus physical topology verification system is used to verify the design of some key parameters in the development of the vehicle bus physical topology, including the verification of the rationality and correctness of the network communication rate, the number of nodes, impedance matching, the length of the main line, and the length of the branch line design, so that the design scheme of the CAN bus physical topology can be fully verified in the early stage of the vehicle network development, providing risk protection for the development of the vehicle CAN network physical topology. This solution pre-verifies the rationality of the main line length and branch line length design through the verification system. However, it does not disclose how to specifically design the optimal main line length and branch line length.

[0004] The Chinese patent application with the publication number CN114670759A discloses a layout method for a vehicle wiring harness based on a CHS topology structure. The steps included in this method are: drawing a vehicle topology diagram in a topology design module according to the vehicle electrical schematic diagram and the three-dimensional data of the vehicle wiring harness; associating and mapping the vehicle topology diagram with the vehicle electrical schematic diagram to generate wire loop information including logical relationships and physical wiring; setting the length dimension information of each branch of the vehicle wiring harness in the topology structure of the logic module Logic; calculating the wire length, weight, and cost of the topology scheme through the embedded Plugin of the comprehensive module; comparing and analyzing the optimal schemes of the wire length, weight, and cost under multiple topology schemes and obtaining the optimal scheme. This solution sets the length dimension information of each branch of the vehicle wiring harness in the topology structure of the logic module Logic. However, this solution does not constrain the distance between the end-matching point and the branch point and the branch data. In its optimization process, all data needs to be calculated, resulting in a large amount of calculation and prone to inaccurate final results.

[0005] The Chinese patent application with the publication number CN116432592A discloses a design method for intelligent wire harnesses. Based on the wire harness standard library, it synchronizes and correlates electrical principles, 3D data, and 2D drawings to form an intelligent wire harness design method with high efficiency and high precision. An electrical component library is established based on the platform server to enable designers with different roles to carry out design work synchronously, improving design generalization and efficiency. By combining the electrical schematic diagram and 3D wire harness topology, the correlation and synchronization between the electrical logic schematic diagram and 3D data are completed, realizing the automatic installation of connectors, terminal distribution points, and wires, eliminating a large amount of repetitive work of manually installing 3D data. At the same time, the signal information in the electrical schematic diagram is mapped into the 3D wire harness data, improving design efficiency and accuracy and realizing intelligent design. This solution mainly forms an intelligent wire harness design method with high efficiency and high precision by correlating and synchronizing electrical principles, 3D data, and 2D drawings based on the wire harness standard library. However, it does not disclose the specific solution for designing the optimal position of the terminal distribution point.

[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 terminal distribution points of wire harnesses based on loop signal laying to solve the problem in the prior art that only the length dimensions of each branch of the vehicle wire harness are set in the topological structure of the logic module Logic, and there is no constraint on the distance between the terminal distribution point and the branch point and the data of the branch. During the optimization process, all data needs to be calculated, resulting in a large amount of calculation and prone to inaccurate final results.

[0008] The present invention provides a method for optimizing the terminal distribution points of wire harnesses based on loop signal laying, including the following steps:

[0009] Obtain the complete physical topology diagram of the vehicle wire harness;

[0010] Identify the loops with at least one branch point in the physical topology diagram of the wire harness and denote them as the first loops, and identify the loop signals without branch points in the vehicle electrical schematic diagram and denote them as the second loops;

[0011] Search for the first main trunk and multiple first branches of each of the first loops in the physical topology diagram of the wire harness to obtain a first signal trunk line set;

[0012] Establish constraint conditions and screen out a second signal trunk line set from the first signal trunk line set;

[0013] Establish an objective function for the minimum total length of all the first branches connected to each first main trunk in the second signal trunk line set to obtain the minimum total length of all the first branches connected to each first main trunk;

[0014] Calculate the minimum total length of all the first branches connected to the first main trunk of each first circuit, and obtain the three-dimensional coordinates of the end fitting points of the corresponding first branches in the physical topology diagram of the wire harness.

[0015] Further, the obtaining of the complete physical topology diagram of the vehicle wire harness includes:

[0016] Map all the circuit signals and electrical equipment in the electrical schematic diagram of the vehicle to the vehicle data. According to the mapping relationship, lay the circuit signals into the vehicle data to obtain the vehicle wire harness signal laying diagram;

[0017] Taking the assemblability of the vehicle wire harness, where each wire harness assembly is an open-loop topology structure, and the vehicle space layout boundary as constraints, and taking the lightest wire weight or the optimal cost of the vehicle wire harness as the optimization goal, iteratively calculate the optimal solution of the path topology of the vehicle wire harness, obtain multiple branch physical topology diagrams, and form the final complete physical topology diagram of the vehicle wire harness.

[0018] Further, the first main trunk refers to the main line connecting the two electrical equipment with the farthest distance connected by the first circuit, and the first branch refers to the main line other than the first main trunk and connected to the first main trunk in the same first circuit.

[0019] Further, the first signal main line set at least includes the first circuit signal and the corresponding first main trunk and first branch.

[0020] Further, the second signal main line set at least includes the first circuit that meets the constraint conditions, and the corresponding first main trunk and first branch.

[0021] Further, the constraint conditions include:

[0022] The distance between the end fitting point and the branch point of the first branch is d≥50mm;

[0023] The space boundary of the end fitting point of the first branch in the physical topology diagram of the wire harness refers to the number c of the first branches connected to the i-th end fitting point of any circuit r_i =1, 0≤i≤h, indicating that one end fitting point is only allowed to connect one signal branch;

[0024] Wherein, r represents the signal code, i represents the number of end fitting points, and h represents the number of first branches.

[0025] Further, the objective function is:

[0026]

[0027] Wherein, S min represents the minimum total length of all the first branches connected to the same first main trunk, l iDenote the length of the first branch connected to the i-th terminal distribution point with signal coding r in the first loop.

[0028] Furthermore, obtaining the three-dimensional coordinates of the terminal distribution points of the corresponding first branches in the physical wiring harness topology diagram includes:

[0029] Taking the center of gravity of the whole vehicle as the origin, taking the extension line passing through the origin and parallel to the forward direction of the whole vehicle as the X-axis, taking the extension line passing through the origin and perpendicular to the forward direction of the whole vehicle and parallel to the bottom plate of the whole vehicle as the Y-axis, and taking the extension line passing through the origin and perpendicular to the forward direction of the whole vehicle and perpendicular to the bottom plate of the whole vehicle as the Z-axis to construct a space coordinate axis;

[0030] Obtain the three-dimensional coordinates (x i , y i , z i ) of all terminal distribution points of each first loop.

[0031] The present invention also provides a wiring harness terminal distribution point optimization system based on loop signal laying, including:

[0032] A physical wiring harness topology diagram acquisition module, configured to map all loop signals and electrical equipment in the electrical schematic diagram of the whole vehicle to the vehicle data, and lay the loop signals into the vehicle data according to the mapping relationship to obtain a vehicle wiring harness signal laying diagram;

[0033] A first signal trunk line set acquisition module, configured to identify the loops with at least one branch point in the physical wiring harness topology diagram and denote them as the first loops, identify the loop signals without branch points in the electrical schematic diagram of the whole vehicle and denote them as the second loops, and find the first main trunk and multiple first branches of each of the first loops in the physical wiring harness topology diagram to obtain a first signal trunk line set;

[0034] A second signal trunk line set acquisition module, configured to establish constraint conditions and screen out a second signal trunk line set from the first signal trunk line set;

[0035] A minimum total length acquisition module of the first branches, configured to establish an objective function for the minimum total length of all first branches connected to each first main trunk in the second signal trunk line set to obtain the minimum total length of all first branches connected to each first main trunk;

[0036] A three-dimensional coordinate acquisition module, configured to calculate the minimum total length of all first branches connected to the first main trunk of each first loop, and obtain the three-dimensional coordinates of the terminal distribution points of the corresponding first branches in the physical wiring harness topology diagram.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. The wire harness end point allocation optimization method based on loop signal laying of the present invention establishes constraint conditions, screens the second signal main line set in the early stage of calculation, reduces the amount of calculation to the greatest extent, and then calculates the minimum total length of all the first branches connected to each first main trunk in the second signal main line set according to the objective function. The final result can be more in line with the actual situation, and the design efficiency is increased by 40%.

[0039] 2. The three-dimensional coordinates of the end points obtained by the wire harness end point allocation optimization method based on loop signal laying of the present invention are more accurate, there will be no redundant wires, and the average material cost per vehicle is saved by 1.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is the vehicle wire harness signal laying diagram of the embodiment of the present invention;

[0041] Figure 2 It is the path schematic diagram of the first branch of the embodiment of the present invention;

[0042] Figure 3 It is the end point coordinate schematic diagram of the embodiment of the present invention;

[0043] Figure 4 It is the connection schematic diagram of the first signal main line set and the second signal main line set of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] In order to further understand the content, features and effects of the present invention, the following embodiments are given and described in detail in conjunction with the attached Figures 1 to 4 as follows.

[0045] The present invention provides a wire harness end point allocation optimization method based on loop signal laying, including the following steps:

[0046] S1. Obtain the complete wire harness physical topology diagram of the vehicle;

[0047] S2. Identify the loops with at least one branch point in the wire harness physical topology diagram and record them as the first loops, and identify the loop signals without branch points in the vehicle electrical schematic diagram and record them as the second loops;

[0048] S3. Search for the first main trunk and multiple first branches of each of the first loops in the wire harness physical topology diagram to obtain the first signal main line set;

[0049] S4. Establish constraint conditions and screen out the second signal main line set from the first signal main line set;

[0050] S5. Establish an objective function for the minimum total length of all the first branches connected to each first main trunk in the second signal main line set to obtain the minimum total length of all the first branches connected to each first main trunk;

[0051] S6. Calculate the minimum total length of all the first branches connected to the first main trunk of each first loop, and obtain the three-dimensional coordinates of the end fitting points of the corresponding first branches in the physical topology diagram of the wire harness.

[0052] The wire harness end fitting point optimization method based on loop signal laying of the present invention establishes constraint conditions, screens the second signal trunk line set in the early stage of calculation, reduces the amount of calculation to the greatest extent, and then calculates the minimum total length of all the first branches connected to each first main trunk in the second signal trunk line set according to the objective function. The final result can be more in line with the actual situation, and the design efficiency is increased by 40%.

[0053] In this embodiment, as Figure 1 shown, the obtaining of the complete physical topology diagram of the vehicle wire harness includes the following steps:

[0054] Map all the loop signals and electrical equipment in the electrical schematic diagram of the vehicle to the vehicle data, and lay the loop signals into the vehicle data according to the mapping relationship to obtain the vehicle wire harness signal laying diagram;

[0055] Taking the assemblability of the vehicle wire harness, where each wire harness assembly has an open-loop topology structure, and the vehicle space layout boundary as constraints, and taking the lightest wire weight or the optimal cost of the vehicle wire harness as the optimization goal, iteratively calculate the optimal solution of the path topology of the vehicle wire harness, obtain multiple branch physical topology diagrams, and form the final complete physical topology diagram of the vehicle wire harness.

[0056] In this embodiment, the first main trunk refers to the main trunk of the two electrical equipment with the farthest distance connected by the first loop, and the first branch refers to the main trunk other than the first main trunk and connected to the first main trunk in the same first loop.

[0057] In this embodiment, the first signal trunk line set at least includes the first loop signal, the corresponding first main trunk, and the first branch.

[0058] In this embodiment, the second signal trunk line set at least includes the first loop that meets the constraint conditions, and the corresponding first main trunk and the first branch. As Figure 4 shown, the green lines are the first signal trunk line set, and the red lines are the second signal trunk line set.

[0059] In this embodiment, the constraint conditions include:

[0060] The distance between the end fitting point and the branch point of the first branch is d≥50mm;

[0061] The space boundary of the end fitting point of the first branch in the physical topology diagram of the wire harness refers to the number c of the first branches connected to the i-th end fitting point of any loopr_i = 1, 0 ≤ i ≤ h, indicating that each terminal connection point only allows one signal branch to be connected;

[0062] Where r represents the signal coding, i represents the number of terminal connection points, and h represents the number of first branches.

[0063] In this embodiment, the objective function is:

[0064]

[0065] Where S min represents the minimum total length of all first branches connected to the same first main trunk, and l i represents the length of the first branch connected to the i-th terminal connection point with signal coding r in the first loop.

[0066] In this embodiment, as Figure 2 and 3 shown, obtaining the three-dimensional coordinates of the terminal connection points of the corresponding first branches in the wire harness physical topology diagram includes:

[0067] Taking the center of gravity of the whole vehicle as the origin, taking the extension line passing through the origin and parallel to the forward direction of the whole vehicle as the X-axis, taking the extension line passing through the origin and perpendicular to the forward direction of the whole vehicle and parallel to the bottom plate of the whole vehicle as the Y-axis, and taking the extension line passing through the origin and perpendicular to the forward direction of the whole vehicle and perpendicular to the bottom plate of the whole vehicle as the Z-axis to construct a space coordinate axis;

[0068] Obtaining the three-dimensional coordinates (x i , y i , z i ) of all terminal connection points of each first loop. This can calculate the accurate position of the terminal connection points, making the optimization of the terminal connection points more accurate, and there will be no redundant wires, saving 1.5% of the average material cost per vehicle.

[0069] The present invention also provides a wire harness terminal connection point optimization system based on loop signal laying, including:

[0070] A wire harness physical topology diagram acquisition module, configured to map all loop signals and electrical equipment in the whole vehicle electrical schematic diagram to the whole vehicle data, and lay the loop signals into the whole vehicle data according to the mapping relationship to obtain a whole vehicle wire harness signal laying diagram;

[0071] A first signal main trunk set acquisition module, configured to identify the loops with at least one branch point in the wire harness physical topology diagram and record them as first loops, identify the loop signals without branch points in the whole vehicle electrical schematic diagram and record them as second loops, and find the first main trunk and multiple first branches of each first loop in the wire harness physical topology diagram to obtain a first signal main trunk set;

[0072] The second signal trunk line set acquisition module is used to establish constraint conditions and screen out the second signal trunk line set from the first signal trunk line set;

[0073] The minimum total length acquisition module of the first branch is used to establish an objective function for the minimum total length of all first branches connected to each first main trunk in the second signal trunk line set, and obtain the minimum total length of all first branches connected to each first main trunk;

[0074] The three-dimensional coordinate acquisition module is used to calculate the minimum total length of all first branches connected to the first main trunk of each first loop, and obtain the three-dimensional coordinates of the end fitting points of the corresponding first branches in the physical topology diagram of the wire harness.

[0075] The above-mentioned invention only expresses the implementation manners of the embodiments of the present invention, and thus cannot be construed 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 wiring harness end point optimization method based on loop signal laying, characterized in that: The following steps are involved: Obtain the complete physical topology diagram of the wiring harness of the entire vehicle; Identify a loop with at least one branch point in the physical topology diagram of the wiring harness and record it as a first loop, and identify a loop signal without a branch point in the electrical schematic diagram of the vehicle and record it as a second loop; Searching the first trunk and the plurality of first branches of each of the first loops in the physical topology diagram of the wiring harness to obtain a first signal trunk set; Establishing constraint conditions to filter out a second signal trunk set from the first signal trunk set; Establishing an objective function regarding the minimum total length of all first branches connected to each first trunk in the second signal trunk set, and obtaining the minimum total length of all first branches connected to each first trunk; The minimum total length of all first branches connected to the first trunks of each first loop is calculated, and the three-dimensional coordinates of the end points of the corresponding first branches are obtained in the physical topology diagram of the wiring harness.

2. The method for optimizing wiring harness end points based on loop signal laying according to claim 1, characterized in that: The method of obtaining a complete physical topology diagram of the wiring harness of the entire vehicle includes: Map all loop signals and electrical equipment in the vehicle electrical schematic diagram to the vehicle data. According to the mapping relationship, lay the loop signals to the vehicle data to obtain the vehicle wiring harness signal laying diagram. Taking the assemblability of the vehicle wiring harness, in which each wiring harness assembly is an open-loop topology structure, and the spatial layout boundary of the vehicle as constraints, and the lightest wire weight or optimal cost of the vehicle wiring harness as the optimization goal, the optimal path topology solution of the vehicle wiring harness is iteratively calculated, and multiple branch physical topology diagrams are obtained, and finally the complete physical topology diagram of the wiring harness of the whole vehicle is formed.

3. The method for optimizing wiring harness end points based on loop signal laying according to claim 1 is characterized in that: The first trunk refers to the trunk line of the two electrical devices farthest apart connected to the first loop, and the first branch refers to the trunk line other than the first trunk in the same first loop and connected to the first trunk.

4. The method for optimizing wiring harness end points based on loop signal laying according to claim 1 is characterized in that: The first signal trunk set includes at least a first loop signal and a corresponding first trunk and a first branch.

5. The method for optimizing wiring harness end points based on loop signal laying according to claim 1 is characterized in that: The second signal trunk set at least includes a first loop that meets the constraint condition, and a corresponding first trunk and a first branch.

6. The method for optimizing wiring harness end points based on loop signal laying according to claim 1, characterized in that: The constraints include: The distance between the end point of the first branch and the branch point is d≥50mm; The spatial boundary of the terminal distribution point of the first branch in the physical topology diagram of the harness refers to the number of first branches connected to the ith terminal distribution point of any loop c r_i =1, 0≤i≤h, indicating that a terminal distribution point is only allowed to connect to one signal branch; Wherein, r represents the signal coding, i represents the number of terminal distribution points, and h represents the number of first branches.

7. The method for optimizing wiring harness end points based on loop signal laying according to claim 1, characterized in that: The objective function is: Among them, S min represents the minimum total length of all first branches connected to the same first trunk, l i It represents the length of the first branch connected to the i-th terminal distribution point with signal code r in the first loop.

8. The method for optimizing wiring harness end points based on loop signal laying according to claim 1, characterized in that: The method of obtaining the three-dimensional coordinates of the corresponding first branch end distribution point in the harness physical topology diagram includes: The center of gravity of the vehicle is taken as the origin, the extension line passing through the origin and parallel to the forward direction of the vehicle is taken as the X-axis, the extension line passing through the origin and perpendicular to the forward direction of the vehicle and parallel to the bottom plate of the vehicle is taken as the Y-axis, and the extension line passing through the origin and perpendicular to the forward direction of the vehicle and perpendicular to the bottom plate of the vehicle is taken as the Z-axis to construct the spatial coordinate axis; Get the three-dimensional coordinates (x i ,y i ,z i ).

9. A wiring harness end point optimization system based on loop signal laying, characterized in that: include: The wiring harness physical topology acquisition module is used to map all loop signals and electrical equipment in the vehicle electrical schematic diagram to the vehicle data, and according to the mapping relationship, lay the loop signals to the vehicle data to obtain the vehicle wiring harness signal laying diagram; A first signal trunk line set acquisition module is used to identify a loop with at least one branch point in the physical topology diagram of the wiring harness, and record it as a first loop, identify a loop signal without a branch point in the electrical schematic diagram of the whole vehicle, and record it as a second loop, and search the first trunk and multiple first branches of each of the first loops in the physical topology diagram of the wiring harness to obtain a first signal trunk line set; A second signal trunk line set acquisition module, used to establish constraint conditions and filter out a second signal trunk line set from the first signal trunk line set; A minimum total length acquisition module for first branches, used to establish an objective function about the minimum total length of all first branches connected to each first trunk in the second signal trunk set, and obtain the minimum total length of all first branches connected to each first trunk; The three-dimensional coordinate acquisition module is used to calculate the minimum total length of all first branches connected to the first trunk of each first loop, and obtain the three-dimensional coordinates of the end distribution point of the corresponding first branch in the physical topology diagram of the wire harness.

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