A method for determining the size of automobile wiring harness

Abstract

The present invention discloses a method for determining the design dimensions of an automobile wiring harness, which belongs to the technical field of automobile wiring harness dimension design, and includes: obtaining tolerance requirements corresponding to different dimension ranges of the wiring harness; establishing a three-dimensional model of the wiring harness, dividing the three-dimensional model of the wiring harness into N three-dimensional models of wiring harness segments, and judging respectively whether the N three-dimensional models of the wiring harness segments meet the tolerance requirements, where N is an even number and greater than or equal to 2; obtaining the position of the endpoint of the three-dimensional model of the wiring harness when the end point is in the vehicle body, obtaining the displacement of the endpoint of the three-dimensional model of the wiring harness, and judging whether the displacement of the endpoint of the three-dimensional model of the wiring harness meets the tolerance requirements; when the N three-dimensional models of the wiring harness segments meet the tolerance requirements and the displacement of the endpoint of the three-dimensional model of the wiring harness meets the tolerance requirements, comprehensively judging whether the displacement of the three-dimensional model of the wiring harness segments and the endpoint of the three-dimensional model of the wiring harness meet the design requirements. The present invention improves the accuracy of the design dimension chain and tolerance design of the wiring harness.

Description

Technical Field

[0001] The invention discloses a method for determining the design size of an automobile wiring harness, and belongs to the technical field of automobile wiring harness size design. Background Art

[0002] The current automotive wiring harness design, wiring harness dimension chain design and tolerance setting have a great impact on the convenience of wiring harness assembly, the reliability of wiring harness products and the cost of wiring harnesses. Accurate wiring harness dimension chain design will optimize the cost of the wiring harness, maximize reliability and facilitate assembly. Accurate tolerance setting of the wiring harness will ensure good assembly and reliability of the wiring harness under extreme conditions, and will not cause excessive differences in wiring harness costs. Poor wiring harness dimension chain design will reduce assembly convenience and make cost control difficult. When tolerances occur in the wiring harness, the wiring harness may be too close to surrounding parts, and the reliability of the wiring harness will also be adversely affected. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the current wire harness size setting has poor accuracy and cannot predict whether the wire harness is within the tolerance range, and to provide a method for determining the size of an automobile wire harness.

[0004] The problem to be solved by the present invention is achieved by the following technical solutions:

[0005] A method for determining the size of an automobile wiring harness, comprising:

[0006] Step S10, obtaining tolerance requirements corresponding to different size range settings of the wiring harness;

[0007] Step S20, establishing a wire harness three-dimensional model, dividing the wire harness three-dimensional model into N wire harness segment three-dimensional models, and determining whether the N wire harness segment three-dimensional models meet the tolerance requirement, where N is an even number and greater than or equal to 2;

[0008] Step S30, obtaining the position of the endpoint of the wiring harness three-dimensional model when it is working at the vehicle body, obtaining the displacement of the endpoint of the wiring harness three-dimensional model, and judging whether the displacement of the endpoint of the wiring harness three-dimensional model meets the tolerance requirement;

[0009] Step S40, when the N wire harness segment 3D models meet the tolerance requirements and the displacement of the endpoints of the wire harness 3D model meets the tolerance requirements, comprehensively determine whether the displacement of the wire harness segment 3D model and the endpoints of the wire harness 3D model meet the design requirements respectively.

[0010] Preferably, the step S20 includes:

[0011] Step S21, establishing a three-dimensional model of the wiring harness;

[0012] Step S22, dividing the wire harness 3D model into N wire harness segment 3D models, where N is an even number and greater than or equal to 2, and judging whether the N wire harness segment 3D models meet the tolerance requirements by using formula (1):

[0013] L-ΔL≤L≤L+ΔL (1)

[0014] Where: L is the size of the 3D model of the harness segment, ΔL is the tolerance;

[0015] Yes, proceed to the next step;

[0016] No, optimize segment size and tolerance requirements;

[0017] Step S23, superimposing the sizes of adjacent three-dimensional models of the N wire harness segment models to obtain N / 2 superimposed three-dimensional models of the wire harness segment, and determining whether the N / 2 superimposed three-dimensional models of the wire harness segment meet the tolerance requirements respectively:

[0018] Yes, proceed to the next step;

[0019] No, optimize segment size and tolerance requirements;

[0020] Step S24, executing step S23 N / 2-1 times until the three-dimensional model of the wire harness segments after superposition is the total size of the three-dimensional model of the wire harness, and judging whether the total size of the three-dimensional model of the wire harness meets the tolerance requirement:

[0021] If yes, execute step S30;

[0022] No, optimize segment size and tolerance requirements.

[0023] Preferably, the tolerance requirement is as shown in formula (1):

[0024] L-ΔL≤L≤L+ΔL (1)

[0025] Where: L is the size of the 3D model of the harness segment, ΔL is the tolerance;

[0026] Preferably, the step S30 includes:

[0027] Step S31, obtaining the endpoint of the wiring harness three-dimensional model when it is working at the vehicle body position:

[0028] When the endpoint of the three-dimensional model of the wiring harness is at a fixed position on the vehicle body, its displacement can be regarded as 0;

[0029] When the endpoint of the three-dimensional model of the wiring harness is located on the main wiring harness during operation, executing the next step;

[0030] Step S32, calculating the displacement of the endpoint of the wiring harness by the following formula 2:

[0031] or

[0032] Among them, Δ N is the displacement of the endpoint of the harness, X is the actual value of the distance from the endpoint of the three-dimensional model of the harness to one end of the trunk harness, Y is the actual value of the distance from the endpoint of the three-dimensional model of the harness to the other end of the trunk harness, L1 is the theoretical value of the distance from the endpoint of the three-dimensional model of the harness to one end of the trunk harness, and L2 is the theoretical value of the distance from the endpoint of the three-dimensional model of the harness to the other end of the trunk harness.

[0033] Step S33, judging whether the displacement of the endpoint of the wiring harness meets the tolerance requirement:

[0034] If yes, execute step S40;

[0035] No, optimize the endpoint position or trunk harness size of the 3D harness model.

[0036] The present invention has the following beneficial effects compared with the prior art:

[0037] The present invention improves the accuracy of the wire harness design dimension chain and tolerance design through a method for determining the size of an automobile wire harness, thereby improving the quality of the wire harness design, enhancing the reliability of the wire harness, and optimizing the cost. Through the present invention, the accuracy of the wire harness size setting can be improved, and the movable range of the wire harness within the tolerance can be predicted, and the distance between the wire harness and the surrounding parts within the tolerance range can be quantified. At the same time, an optimization algorithm is also made for the setting method of the wire harness tolerance, eliminating tolerance accumulation, reducing the tolerance by 50% or more on the basis of the original tolerance, and further improving the accuracy of the tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a flow chart of a method for determining the size of an automobile wiring harness. DETAILED DESCRIPTION

[0039] The following is based on the attached Figure 1 The present invention is further described:

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] like Figure 1 As shown, the first embodiment of the present invention provides a method for determining the size of an automobile wiring harness based on the prior art, comprising:

[0044] Step S10, obtaining tolerance requirements corresponding to different size range settings of the wiring harness, as shown in Table 1 below:

[0045] Table 1 Relationship between wiring harness dimensions and tolerances

[0046]

[0047] Step S20, establishing a three-dimensional model of the wiring harness, dividing the three-dimensional model of the wiring harness into N three-dimensional models of wiring harness segments, and judging whether the N three-dimensional models of wiring harness segments meet the tolerance requirements, where N is an even number and greater than or equal to 2. The specific contents are as follows:

[0048] Step S21, establishing a three-dimensional model of the wiring harness;

[0049] Step S22, dividing the wire harness 3D model into N wire harness segment 3D models, where N is an even number and greater than or equal to 2, and judging whether the N wire harness segment 3D models meet the tolerance requirements by using formula (1):

[0050] L-ΔL≤L≤L+ΔL (1)

[0051] Where: L is the size of the 3D model of the harness segment, ΔL is the tolerance;

[0052] Yes, proceed to the next step;

[0053] No, optimize segment size and tolerance requirements;

[0054] Step S23, superimposing the sizes of adjacent three-dimensional models of the N wire harness segment models to obtain N / 2 superimposed three-dimensional models of the wire harness segment, and determining whether the N / 2 superimposed three-dimensional models of the wire harness segment meet the tolerance requirements respectively:

[0055] Yes, proceed to the next step;

[0056] No, optimize segment size and tolerance requirements;

[0057] Step S24, executing step S23 N / 2-1 times until the three-dimensional model of the wire harness segments after superposition is the total size of the three-dimensional model of the wire harness, and judging whether the total size of the three-dimensional model of the wire harness meets the tolerance requirement:

[0058] If yes, execute step S30;

[0059] No, optimize segment size and tolerance requirements.

[0060] Step S30, obtaining the endpoint of the wiring harness three-dimensional model at the vehicle body position when it is working, obtaining the displacement of the endpoint of the wiring harness three-dimensional model, and judging whether the displacement of the endpoint of the wiring harness three-dimensional model meets the tolerance requirement, the specific steps are as follows:

[0061] Step S21, obtaining the endpoint of the wiring harness three-dimensional model when it is working at the vehicle body position:

[0062] When the endpoint of the three-dimensional model of the wiring harness is at a fixed position on the vehicle body, its displacement can be regarded as 0;

[0063] When the endpoint of the three-dimensional model of the wiring harness is located on the main wiring harness during operation, executing the next step;

[0064] Step S22, calculating the displacement of the endpoint of the wiring harness by the following formula 2:

[0065] or

[0066] Among them, Δ N is the displacement of the endpoint of the harness, X is the actual value of the distance from the endpoint of the three-dimensional model of the harness to one end of the trunk harness, Y is the actual value of the distance from the endpoint of the three-dimensional model of the harness to the other end of the trunk harness, L1 is the theoretical value of the distance from the endpoint of the three-dimensional model of the harness to one end of the trunk harness, and L2 is the theoretical value of the distance from the endpoint of the three-dimensional model of the harness to the other end of the trunk harness.

[0067] When the endpoint of the wire harness 3D model is at the midpoint of the wire harness trunk, L1 = L2, Δ N Reaching the extreme value, the extreme value is:

[0068]

[0069] Where: Δ = X-L1

[0070] Step S23, determining whether the displacement of the endpoint of the wiring harness meets the tolerance requirement:

[0071] If yes, execute step S40;

[0072] No, optimize the endpoint position or trunk harness size of the 3D harness model.

[0073] Step S40, when the N wire harness segment 3D models meet the tolerance requirements and the displacement of the endpoints of the wire harness 3D model meets the tolerance requirements, comprehensively determine whether the displacement of the wire harness segment 3D model and the endpoints of the wire harness 3D model meet the design requirements respectively.

[0074] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A method for determining the size of automotive wiring harnesses. It is characterized in that include: Step S10, obtaining tolerance requirements corresponding to different size range settings of the wiring harness; Step S20, establishing a wire harness three-dimensional model, dividing the wire harness three-dimensional model into N wire harness segment three-dimensional models, and determining whether the N wire harness segment three-dimensional models meet the tolerance requirement, where N is an even number and greater than or equal to 2; Step S30, obtaining the vehicle body position where the endpoint of the wiring harness three-dimensional model is located when the wiring harness three-dimensional model is working, obtaining the displacement of the endpoint of the wiring harness three-dimensional model, and judging whether the displacement of the endpoint of the wiring harness three-dimensional model meets the tolerance requirement; Step S40, when the N wire harness segment three-dimensional models meet the tolerance requirements and the displacement of the endpoints of the wire harness three-dimensional model meets the tolerance requirements, comprehensively judging whether the displacement of the wire harness segment three-dimensional model and the endpoints of the wire harness three-dimensional model meet the design requirements respectively; The step S20 comprises: Step S21, establishing a three-dimensional model of the wiring harness; Step S22, dividing the wire harness 3D model into N wire harness segment 3D models, where N is an even number and greater than or equal to 2, and judging whether the N wire harness segment 3D models meet the tolerance requirements by using formula (1): L-ΔL≤L≤L+ΔL (1) Where: L is the size of the 3D model of the harness segment, ΔL is the tolerance; Yes, proceed to the next step; No, optimize segment size and tolerance requirements; Step S23, superimposing the sizes of adjacent three-dimensional models of the N wire harness segment models to obtain N / 2 superimposed three-dimensional models of the wire harness segment, and determining whether the N / 2 superimposed three-dimensional models of the wire harness segment meet the tolerance requirements respectively: Yes, proceed to the next step; No, optimize segment size and tolerance requirements; Step S24, executing step S23 N / 2-1 times until the three-dimensional model of the wire harness segments after superposition is the total size of the three-dimensional model of the wire harness, and judging whether the total size of the three-dimensional model of the wire harness meets the tolerance requirement: If yes, execute step S30; No, optimize segment size and tolerance requirements; The step S30 comprises: Step S31, obtaining the vehicle body position where the endpoint of the wiring harness three-dimensional model is located when the wiring harness three-dimensional model is working: When the endpoint of the three-dimensional model of the wiring harness is at a fixed position on the vehicle body, its displacement can be regarded as 0; When the endpoint of the three-dimensional model of the wiring harness is located on the main wiring harness during operation, executing the next step; Step S32, calculating the displacement of the endpoint of the wiring harness by the following formula 2: Among them, Δ N is the displacement of the wire harness endpoint, X is the actual value of the distance from one end of the wire harness endpoint to the main wire harness in the three-dimensional model, Y is the actual value of the distance from the other end of the wire harness endpoint to the main wire harness in the three-dimensional model, L 1 L is the theoretical value of the distance from the end point of the three-dimensional model of the harness to one end of the trunk harness. 2 The theoretical value of the distance between the endpoint of the three-dimensional model of the wire harness and the other end of the trunk wire harness; Step S33, judging whether the displacement of the endpoint of the wiring harness meets the tolerance requirement: If yes, execute step S40; No, optimize the endpoint position of the harness 3D model or the size of the main harness.

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