A wire harness radiation simulation method and system based on magnetic ring impedance frequency response characteristics

Abstract

The application relates to a wire harness radiation simulation method and system based on the impedance frequency response characteristics of a magnetic ring, and the method comprises the following steps: selecting measuring points around an electromagnetic simulation coupling model of a magnetic ring, a wire harness and a metal structure around the wire harness; inputting an excitation condition data and a magnetic ring impedance characteristic notebook document to perform simulation analysis, obtaining a first electric field radiation value of the measuring points changing with frequency curve diagram, the above process does not need to set the magnetic ring in the actual vehicle for verification, the impedance frequency response characteristic curve of the magnetic ring is converted into an impedance characteristic notebook document, so that the electric field radiation value of the measuring points under different frequencies after the magnetic ring of the specification type is set is obtained; in addition, the specification and the installation position of the magnetic ring can be modified, and then simulation is performed again, so that the specification and the installation position of the magnetic ring meeting the requirements are quickly determined, and the test time is reduced; the simulation analysis result gives a reference for modifying and adjusting the specification and the installation position, avoids randomness of modification, and provides certain guidance for rectification of electromagnetic radiation exceeding of a direct current fast charging wire harness.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile electromagnetic compatibility design, and in particular to a wire harness radiation simulation method and system based on the impedance frequency response characteristics of a magnetic ring. BACKGROUND

[0002] With the electrification of new energy vehicles, battery packs are standard equipment for new energy vehicles, and the capacity of battery packs is increasingly improved, resulting in more mileage. Each battery pack has its own independent charging system, which is divided into two types: direct current fast charging and conventional slow charging. The wire harness for direct current fast charging is composed of two positive and negative wire harnesses.

[0003] When a new energy vehicle is subjected to high-current fast charging, the current in the positive and negative wire harnesses can generate electromagnetic radiation in the surrounding environment. In particular, when the vehicle is being charged, the electric field value radiated to the surrounding environment can exceed the standard limit.

[0004] The positive and negative wire harnesses for direct current fast charging are connected to the ground charging pile at one end and the on-board charger system OBC in the new energy vehicle at the other end. When the radiation exceeds the standard during direct current fast charging, the charging pile and the on-board charger cannot be modified, repaired, or maintained. At this time, the direct current fast charging wire harness, as one of the three elements of electromagnetic compatibility, is the transmission path, and the positive and negative wire harnesses are the objects of electromagnetic radiation rectification.

[0005] The three conventional methods for automobile electromagnetic compatibility rectification are filtering, grounding, and shielding. Adding a shielding layer and grounding can result in high rectification costs, and the filtering method often involves adding a magnetic ring to reduce electromagnetic radiation using the impedance characteristics of the magnetic ring, which is a cost-effective measure.

[0006] In general, a magnetic ring is added to the actual wire harness, and then an excitation is set to test the entire vehicle at a selected frequency, but there are the following problems:

[0007] (1) How to determine the position of the added magnetic ring requires multiple changes in testing, such as adding a magnetic ring to the positive wire harness or the negative wire harness, or placing the magnetic ring close to the battery pack side or close to the ground charging pile side. The testing time and cost are high and have a certain randomness.

[0008] (2) How to select the frequency that best reduces electromagnetic radiation, and how to select the magnetic ring of different types and performance that best reduces electromagnetic radiation, requires multiple tests.

[0009] Therefore, a wire harness radiation simulation method and system based on the impedance frequency response characteristics of a magnetic ring are provided to solve the above problems. In order to provide certain guidance experience for rectification of direct current fast charging wire harness electromagnetic radiation exceeding the standard, and to reduce testing time and cost. SUMMARY

[0010] Embodiments of the present application provide a wire harness radiation simulation method and system based on the impedance frequency response characteristics of a magnetic ring, to solve the problem in the related art that multiple tests are required to determine whether the magnetic ring meets the electromagnetic radiation suppression requirements during automotive electromagnetic compatibility rectification, resulting in high test time cost and certain randomness.

[0011] In a first aspect, a wire harness radiation simulation method based on the impedance frequency response characteristics of a magnetic ring is provided, which includes the following steps:

[0012] An electromagnetic simulation coupling model related to the magnetic ring, the wire harness, and the metal structure around the wire harness is established;

[0013] Measurement points are selected around the electromagnetic simulation coupling model;

[0014] The excitation condition data and the impedance characteristics of the magnetic ring are recorded in a text document as simulation input data, and then electromagnetic simulation analysis is performed in combination with the electromagnetic simulation coupling model to output a first electric field radiation value curve with respect to frequency.

[0015] In some embodiments, after obtaining the first electric field radiation value curve with respect to frequency, the following steps are further included:

[0016] The magnetic ring in the electromagnetic simulation coupling model is removed, and then only the excitation condition data is used as simulation input data, and then electromagnetic simulation analysis is performed in combination with the electromagnetic simulation coupling model to obtain a second electric field radiation value curve with respect to frequency;

[0017] The second electric field radiation value curve with respect to frequency and the first electric field radiation value curve with respect to frequency are compared to obtain the electric field radiation reduction value at different operating frequencies after the magnetic ring is added.

[0018] In some embodiments, establishing an electromagnetic simulation coupling model related to the magnetic ring, the wire harness, and the metal structure around the wire harness includes the following steps:

[0019] A three-dimensional electric field simulation model related to the magnetic ring, the wire harness, and the metal structure around the wire harness is established;

[0020] A wire harness topology simulation model related to the wire harness is established, and then a variable impedance module corresponding to the magnetic ring is added to the wire harness topology simulation model to form a new wire harness topology simulation model;

[0021] The three-dimensional electric field simulation model and the new wire harness topology simulation model are coupled to form the electromagnetic simulation coupling model.

[0022] In some embodiments, establishing a three-dimensional electric field simulation model related to the magnetic ring, the wire harness, and the metal structure around the wire harness specifically includes the following steps:

[0023] A wire harness grid unit is established according to the distribution trajectory and corresponding coordinate information of the wire harness in the actual vehicle coordinate; the wire harness includes a positive wire harness and a negative wire harness;

[0024] A wire harness model is established based on the wire harness grid unit and in combination with size data and material data of the wire harness;

[0025] A magnetic ring unit is added at a design position of the wire harness model to update the wire harness model;

[0026] A three-dimensional model is established according to size data of a metal structure around the wire harness, and then the updated wire harness model is combined with the three-dimensional model to obtain the three-dimensional electric field simulation model.

[0027] In some embodiments, a wire harness topology simulation model about the wire harness is established, specifically including the following steps:

[0028] A first excitation line topology model and a topology wire harness segment corresponding to the positive wire harness are established; the first excitation line topology model includes a first part and a second part; the first part includes a first connection joint, a first resistor, an excitation source topology model and a first ground terminal connected in sequence; the second part includes a second connection joint, a second resistor and a second ground terminal connected in sequence;

[0029] The two ends of the topology wire harness segment corresponding to the positive wire harness are connected with the first connection joint and the second connection joint respectively to form a positive wire harness topology simulation model;

[0030] A second excitation line topology model and a topology wire harness segment corresponding to the negative wire harness are established; the second excitation line topology model includes a first part and a second part; the first part includes a first connection joint, a first resistor, an excitation source topology model and a first ground terminal connected in sequence; the second part includes a second connection joint, a second resistor and a second ground terminal connected in sequence;

[0031] The two ends of the topology wire harness segment corresponding to the negative wire harness are connected with the first connection joint and the second connection joint respectively to form a negative wire harness topology simulation model;

[0032] The positive wire harness topology simulation model and the negative wire harness topology simulation model are taken as the wire harness topology simulation model of the wire harness.

[0033] In some embodiments, the magnetic ring is sleeved on the negative wire harness close to one side of the vehicle battery pack.

[0034] In some embodiments, the size data includes the geometric radius and thickness of the core wire and the insulating layer of the wire harness; and the material data includes the conductivity, the relative dielectric constant and the loss tangent.

[0035] In some embodiments, obtaining the impedance characteristic notebook document includes the following steps:

[0036] Obtaining the impedance frequency response characteristic curve of the magnetic ring, and reading a plurality of sets of characteristic data; each set of characteristic data includes an impedance value and a corresponding frequency of the impedance value in the impedance frequency response characteristic curve;

[0037] The plurality of sets of characteristic data are numbered and sorted to form an impedance characteristic notebook document.

[0038] In a second aspect, a wire harness radiation simulation system based on the impedance frequency response characteristic of a magnetic ring is provided, which includes:

[0039] A first module for establishing an electromagnetic simulation coupling model related to the magnetic ring, the wire harness, and the metal structure around the wire harness;

[0040] A second module for selecting a measurement point around the electromagnetic simulation coupling model;

[0041] A third module for inputting excitation condition data and an impedance characteristic notebook document of the magnetic ring as simulation input data, and then performing electromagnetic simulation analysis in combination with the electromagnetic simulation coupling model to output a first electric field radiation value-frequency change curve of the measurement point; the simulation input data of the magnetic ring includes the impedance characteristic notebook document of the magnetic ring.

[0042] In some embodiments, a fourth module is further included, which is configured to automatically call the impedance characteristic notebook document and form the simulation input data in combination with the excitation condition data; the fourth module is further configured to modify and store the impedance characteristic notebook document and the excitation condition data

[0043] The technical scheme provided in the application has the following beneficial effects:

[0044] The embodiments of the application provide a wire harness radiation simulation method and system based on the impedance frequency response characteristic of a magnetic ring. A measurement point is selected around an electromagnetic simulation coupling model related to the magnetic ring, the wire harness, and the metal structure around the wire harness. Then, excitation condition data and an impedance characteristic notebook document of the magnetic ring are inputted for simulation analysis to obtain a first electric field radiation value-frequency change curve of the measurement point. The entire analysis process does not need to set the magnetic ring in an actual vehicle for verification. The impedance frequency response characteristic curve in the product specification of the magnetic ring is used, and is converted into an impedance characteristic notebook document, so that the electric field radiation value of the measurement point at different frequencies after the magnetic ring of the specification type is set can be obtained, thereby saving the time for actual vehicle verification. In addition, the simulation input data and the electromagnetic simulation coupling model can be changed according to different specifications and installation positions of the magnetic ring, so that the specification and installation position of the magnetic ring that meet the requirements can be quickly determined, and the test time is reduced. Furthermore, the specification and installation position of the magnetic ring can be modified and adjusted according to the first electric field radiation value-frequency change curve, so that a reference standard is provided, and the randomness of modification is reduced, thereby providing certain guidance for rectification of electromagnetic radiation over-standard of a direct current fast charging wire harness. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0046] Figure 1 The wire harness grid unit established according to the distribution trajectory and corresponding coordinate information of the wire harness in the actual vehicle coordinate provided for the embodiments of the present application;

[0047] Figure 2 The positive wire harness topology simulation model provided for the embodiments of the present application;

[0048] Figure 3 The negative wire harness topology simulation model with a magnetic ring provided for the embodiments of the present application;

[0049] Figure 4 The three-dimensional model established according to the size data of the metal structure around the wire harness provided for the embodiments of the present application;

[0050] Figure 5 The first electric field radiation value versus frequency curve provided for the embodiments of the present application;

[0051] Figure 6 The second electric field radiation value versus frequency curve provided for the embodiments of the present application;

[0052] Figure 7 The approximate flowchart of the wire harness radiation simulation method based on the impedance frequency response characteristics of the magnetic ring provided for the embodiments of the present application. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0054] It should be understood that:

[0055] Magnetic ring: the principle of magnetic ring is to absorb the energy of electromagnetic disturbance and convert it into heat energy to reduce radiation disturbance. The factors affecting the working characteristics of the magnetic ring mainly include the magnetic permeability of the magnetic ring, the number of turns of the coil wound around the magnetic ring, and the aperture of the magnetic ring. When using, appropriate magnetic rings should be selected according to the frequency band of the radiation exceeding the standard. As long as the magnetic ring is sleeved on the protected line, no grounding is required, and the disturbance frequency band can be effectively suppressed by using the band-pass characteristics of the magnetic ring, so that the expected effect can be achieved.

[0056] The magnetic ring can be approximately regarded as a series connection of resistance and inductance, which are related to frequency and change with the change of frequency. At low frequency, the impedance is composed of the inductive reactance of the inductance, and at high frequency, the impedance is composed of the resistance component. At this time, the resistance plays a major role, and the high-frequency noise energy will be converted into heat energy by the resistance. Different ferrite suppression elements have different optimal suppression frequency ranges. Generally, the higher the magnetic permeability, the lower the suppression frequency.

[0057] During the electromagnetic compatibility EMI test process, the radiation value often exceeds the limit value. The magnetic ring can effectively solve the radio frequency interference suppression problem of power lines, signal lines and connectors, and has many advantages such as simple use, convenience, small space occupation, etc., and is widely used.

[0058] Generally, the magnetic ring is added to the actual wire harness, and then the excitation is set to test the actual vehicle at the selected frequency. However, the following problems exist:

[0059] (1) How to determine the setting position of the added magnetic ring needs to be changed multiple times for testing, for example, adding a magnetic ring to the positive wire harness or adding a magnetic ring to the negative wire harness, or placing the magnetic ring close to the battery pack side or close to the side of the ground charging pile. The test time cost is high and has a certain randomness.

[0060] (2) How to select the frequency at which the electromagnetic radiation is best reduced, and how to select the magnetic ring of different models and performance to best reduce the electromagnetic radiation, which needs to be tested multiple times.

[0061] In order to provide certain guidance experience for rectifying the electromagnetic radiation exceeding the standard of a certain direct current fast charging wire harness and reduce the test time and cost, an embodiment of the present application provides a wire harness radiation simulation method based on the impedance frequency response characteristics of a magnetic ring, to solve the problem in the related art that multiple tests are required to determine whether the magnetic ring meets the electromagnetic radiation suppression requirement during the electromagnetic compatibility rectification of the vehicle, resulting in high test time cost and a certain randomness.

[0062] In a first aspect, referring to Figures 1-7 A wire harness radiation simulation method based on the impedance frequency response characteristics of a magnetic ring includes:

[0063] Step 100, establishing an electromagnetic simulation coupling model about the magnetic ring, the wire harness and the metal structure around the wire harness;

[0064] Step 200, selecting a measurement point around the electromagnetic simulation coupling model;

[0065] Step 300, taking the excitation condition data, and the port excitation is a current with an amplitude of 60A.

[0066] And the impedance characteristic notebook document of the magnetic ring is taken as simulation input data, and then electromagnetic simulation analysis is carried out in combination with the electromagnetic simulation coupling model to output a first electric field radiation value-frequency variation curve of the measurement point; the simulation input data of the magnetic ring includes the impedance characteristic notebook document of the magnetic ring.

[0067] The whole analysis process above does not need to set the magnetic ring in the actual vehicle for verification, and the impedance frequency response characteristic curve in the product specification of the magnetic ring is converted into the impedance characteristic notebook document to obtain the electric field radiation value of the measurement point at different frequencies after the magnetic ring of the specification type is set, thereby saving the time for actual vehicle verification; in addition, the simulation input data and the electromagnetic simulation coupling model can be changed according to different specifications and installation positions of the magnetic ring, the specification and installation position of the magnetic ring that meet the requirements can be quickly determined, and the test time is reduced; furthermore, the specification and installation position of the magnetic ring can be modified and adjusted according to the first electric field radiation value-frequency variation curve to give a reference standard, reduce the randomness of modification, and provide certain guidance for rectification of the electromagnetic radiation of the DC fast charging wire harness.

[0068] In addition, the magnetic ring is widely used, although the magnetic ring can reduce the radiation value for some EMI tests, but it is still a remedial measure for the problem, if the electromagnetic compatibility problem is considered when the product is designed, the occurrence of such problems can be reduced, and the trouble of later rectification is avoided. Therefore, the wire harness radiation simulation method based on the impedance frequency response characteristic of the magnetic ring can set the magnetic ring in the design stage to determine the installation position and the specification of the magnetic ring.

[0069] In some preferred embodiments, step 400 is further included, referring to Figure 5 And Figure 6 Step 400, after the first electric field radiation value-frequency variation curve is obtained, the following steps are further included:

[0070] The magnetic ring in the electromagnetic simulation coupling model is cancelled, and then only the excitation condition data is taken as simulation input data, and then electromagnetic simulation analysis is carried out in combination with the electromagnetic simulation coupling model to obtain a second electric field radiation value-frequency variation curve, see Figure 6 ;

[0071] The second electric field radiation value-frequency curve is compared with the first electric field radiation value-frequency curve to obtain the electric field radiation reduction value of the magnetic ring at different working frequencies after the magnetic ring is added.

[0072] Through the electric field radiation reduction value at different working frequencies, the strength of the magnetic ring shielding can be known, and which frequency has the best shielding, so that targeted improvement can be made.

[0073] In some preferred embodiments, step 100, establishing an electromagnetic simulation coupling model about the magnetic ring, the wire harness and the metal structure around the wire harness, specifically includes the following steps:

[0074] Step 1001, establishing a three-dimensional electric field simulation model about the magnetic ring, the wire harness and the metal structure around the wire harness; step 1001 specifically includes the following steps:

[0075] Step 1001-1, establishing a wire harness grid unit according to the distribution trajectory and corresponding coordinate information of the wire harness in the actual vehicle coordinates; refer to FIG. 2 Figure 1 The wire harness includes a positive wire harness Q and a negative wire harness R, and the S end is close to the battery pack side and the T end is close to the motor side, Figure 1 The marked points on the wire harness are coordinate points, and there are many coordinate points, which will be cluttered if all are displayed, so only a few coordinate points are selectively displayed here.

[0076] Step 1001-2, establishing a wire harness model based on the wire harness grid unit and combining the size data and material data of the wire harness; the size data includes the geometric radius and thickness of the core wire and the insulating layer of the wire harness; the material data includes the conductivity, the relative dielectric constant and the loss tangent.

[0077] Step 1001-3, setting a magnetic ring unit at the designed position of the wire harness model to update the wire harness model.

[0078] Step 1001-4, establishing a three-dimensional model according to the size data of the metal structure around the wire harness, and then combining the updated wire harness model with the three-dimensional model to obtain a three-dimensional electric field simulation model. The three-dimensional model is shown in FIG. 3 Figure 4 .

[0079] Step 1001-5, taking the positive wire harness topology simulation model and the negative wire harness topology simulation model as the wire harness topology simulation model of the wire harness.

[0080] Step 1002, refer to Figure 3 establishing a wire harness topology simulation model about the wire harness, and then adding a variable impedance module corresponding to the magnetic ring in the wire harness topology simulation model to form a new wire harness topology simulation model; wherein, establishing a wire harness topology simulation model about the wire harness includes the following steps:

[0081] Step 1002-1, a first excitation line topology model is established and a topology line bundle segment corresponding to the positive line bundle is established; the first excitation line topology model includes a first part and a second part; the first part includes a first connection connector Cableconector2, a first resistor R2 (the resistance value is 1 Mohm), a positive excitation source topology model Port_P and a first ground terminal connected in sequence; the second part includes a second connection connector Cableconector2, a second resistor R2 (the resistance value is 50 ohm) and a second ground terminal connected in sequence;

[0082] Step 1002-2, the two ends of the topology line bundle segment corresponding to the positive line bundle are connected with the first connection connector and the second connection connector respectively to form a positive line bundle topology simulation model, as shown in FIG. 6; Figure 2 ;

[0083] Step 1002-3, a second excitation line topology model is established and a topology line bundle segment corresponding to the negative line bundle is established; the second excitation line topology model includes a first part and a second part; the first part includes a first connection connector Cableconector2, a first resistor R2 (the resistance value is 1 Mohm), a positive excitation source topology model Port_N and a first ground terminal connected in sequence; the second part includes a second connection connector Cableconector2, a second resistor R2 (the resistance value is 50 ohm) and a second ground terminal connected in sequence;

[0084] Step 1002-4, the two ends of the topology line bundle segment corresponding to the negative line bundle are connected with the first connection connector and the second connection connector respectively to form a negative line bundle topology simulation model, as shown in FIG. 7; Figure 3 , as shown in FIG. 7; Figure 3 is in the form of a magnetic ring Z1.

[0085] Step 1003, the three-dimensional electric field simulation model and the new line bundle topology simulation model are coupled to form an electromagnetic simulation coupling model.

[0086] In some preferred embodiments, the above is a simulation test on the installation position, and after actual analysis and test, it is found that the shielding effect of the magnetic ring sleeved on the negative line bundle on the side close to the vehicle battery pack is the best, so that the harmonics in the current from the battery pack can be suppressed by the magnetic ring after passing through the negative line cable in a very short distance, reducing the radiation emission of the negative line bundle. At the same time, it is also convenient for the assembly of the magnetic ring. Therefore, in subsequent vehicles of the same type, only the specification of the magnetic ring needs to be determined during rectification.

[0087] In some preferred embodiments, the impedance characteristic notebook document includes the following steps:

[0088] Obtain the impedance frequency response characteristic curve of the magnetic ring, and read a plurality of sets of characteristic data; each set of characteristic data includes an impedance value and a frequency corresponding to the impedance value in the impedance frequency response characteristic curve;

[0089] The plurality of sets of characteristic data are numbered and sorted to form an impedance characteristic notebook document.

[0090] This is because each magnetic ring product has an impedance frequency response characteristic curve in the specification, but it cannot be directly simulated for use, and needs to be processed for easy calling and participation in simulation.

[0091] In a second aspect, the application provides a wire harness radiation simulation system based on the impedance frequency response characteristic of the magnetic ring, comprising:

[0092] A first module for establishing an electromagnetic simulation coupling model about the magnetic ring, the wire harness and the metal structure around the wire harness;

[0093] A second module for selecting a measurement point around the electromagnetic simulation coupling model;

[0094] A third module for taking the excitation condition data and the impedance characteristic notebook document of the magnetic ring as simulation input data, and then combining the electromagnetic simulation coupling model to perform electromagnetic simulation analysis to output a first electric field radiation value-frequency change curve of the measurement point; the simulation input data of the magnetic ring includes the impedance characteristic notebook document of the magnetic ring.

[0095] In some preferred embodiments, a fourth module is further included, which is used to automatically call the impedance characteristic notebook document and combine the excitation condition data to form simulation input data; the fourth module is also used to modify and store the impedance characteristic notebook document and the excitation condition data.

[0096] The script language of the fourth module is:

[0097] ** Source power

[0098] PW: 0 : 0

[0099] !!for #i=1 to 28 step 1

[0100] #freq=fileread("ring impedance_USE.txt",#i,1)

[0101] #z1=fileread("ring impedance_USE.txt",#i,1)

[0102] CI: 1 : CableHarness_P.ComplexLoad.Z1 :::: 1

[0103] 0 : CableHarness_P.positive.End : 1 : CableHarness_P.Circuit3.PseudoConnector : 1 : #z1 : 0 :::: 0** Z1

[0104] !! next

[0105] ** Sources

[0106] AK: 0 : CableHarness_P.Circuit3.PseudoConnector : 2 : CableHarness_P.positive.End : 2 : 60000000 : 0 : 50 : 0 : 0** VoltageSource1|Port_P

[0107] AK: 1 : CableHarness_N.Circuit3.PseudoConnector : 1 : CableHarness_N.negative.End : 2 : 60000000 : 0 : 50 : 0 : 0** VoltageSource2|Port_N

[0108] The fourth module can be modified to facilitate simulation calculation, and the input data is changed directly through the module, that is, when one data changes and other data does not change, only the changed data needs to be submitted again, without repeated submission and input.

[0109] The functions of the modules in the above wire harness radiation simulation system based on the impedance frequency response characteristics of the magnetic ring correspond to the steps in the above wire harness radiation simulation method embodiment, and the functions and implementation processes will not be repeated here.

[0110] The terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. The terms "first", "second" and "third" and the like descriptions are used to distinguish different objects, and do not represent the order or limit the types of "first", "second" and "third".

[0111] In the description of the embodiments of the present application, "exemplary", "for example", "e.g." or "for instance" are used on the basis that a thing in the example is presented merely as an example, illustration, or description. Any embodiment or design scheme described as "exemplary", "for example", or "for instance" in the embodiments of the present application should not be interpreted as being more preferred or having more advantages than other embodiments or design schemes. Rather, the words "exemplary", "for example", or "for instance" are intended to present the relevant concept in a specific manner.

[0112] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text merely describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0113] In some processes described in the embodiments of the present application, a plurality of operations or steps are included, which appear in a specific order, but it should be understood that these operations or steps can be executed or executed in parallel without the order in which they appear in the embodiments of the present application. The serial number of the operation is only used to distinguish different operations, and the serial number itself does not represent any execution order. In addition, these processes can include more or fewer operations, and these operations or steps can be executed in sequence or in parallel, and these operations or steps can be combined.

[0114] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a plurality of instructions for making a terminal device execute the method described in each embodiment of the present application.

[0115] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A wire harness radiation simulation method based on the frequency response characteristics of magnetic ring impedance, characterized in that: It includes the following steps: Establishing an electromagnetic simulation coupling model for the magnetic ring, the wiring harness, and the metal structure surrounding the wiring harness; establishing an electromagnetic simulation coupling model for the magnetic ring, the wiring harness, and the metal structure surrounding the wiring harness, including the following steps: establishing a three-dimensional electric field simulation model for the magnetic ring, the wiring harness, and the metal structure surrounding the wiring harness; establishing a wiring harness topology simulation model for the wiring harness, and then adding a variable impedance module corresponding to the magnetic ring to the wiring harness topology simulation model to form a new wiring harness topology simulation model; coupling the three-dimensional electric field simulation model and the new wiring harness topology simulation model to form an electromagnetic simulation coupling model; Selecting measurement points around the electromagnetic simulation coupling model; The excitation condition data and the impedance characteristic notepad document of the magnetic ring are used as simulation input data, and then an electromagnetic simulation analysis is performed in combination with an electromagnetic simulation coupling model to output a curve graph of the first electric field radiation value of the measuring point versus frequency; After obtaining the first electric field radiation value versus frequency curve graph, the method further includes the following steps: canceling the magnetic ring in the electromagnetic simulation coupling model, then using only the excitation condition data as simulation input data, and then performing electromagnetic simulation analysis in combination with the electromagnetic simulation coupling model to obtain the second electric field radiation value versus frequency curve graph; comparing the second electric field radiation value versus frequency curve graph with the first electric field radiation value versus frequency curve graph to obtain the electric field radiation reduction value at different operating frequencies after adding the magnetic ring.

2. The wire harness radiation simulation method based on the magnetic ring impedance frequency response characteristics according to claim 1, characterized in that: Establishing a 3D electric field simulation model of the magnetic ring, wiring harness, and surrounding metal structures includes the following steps: Establishing a wiring harness grid unit according to the distribution trajectory of the wiring harness in the actual vehicle coordinates and the corresponding coordinate information; the wiring harness includes a positive wiring harness and a negative wiring harness; Establishing a wire harness model based on the wire harness grid unit and in combination with the size data and material data of the wire harness; Adding a magnetic ring unit at the design position of the wiring harness model to update the wiring harness model; A three-dimensional model is established according to the dimension data of the metal structure around the wiring harness, and then the updated wiring harness model is combined with the three-dimensional model to obtain the three-dimensional electric field simulation model.

3. The wire harness radiation simulation method based on the magnetic ring impedance frequency response characteristics according to claim 2, characterized in that: Establishing a harness topology simulation model for the harness includes the following steps: Establishing a first excitation circuit topology model and a topology wiring harness segment corresponding to the positive wiring harness; the first excitation circuit topology model includes a first part and a second part; the first part includes sequentially connecting a first connection joint, a first resistor, an excitation source topology model, and a first ground terminal; the second part includes sequentially connecting a second connection joint, a second resistor, and a second ground terminal; Connecting two ends of the topology harness segment corresponding to the positive harness to the first connection joint and the second connection joint respectively to form a positive harness topology simulation model; Establishing a second excitation circuit topology model and a topology wiring harness segment corresponding to the negative wiring harness; the second excitation circuit topology model includes a first part and a second part; the first part includes sequentially connecting a first connection joint, a first resistor, an excitation source topology model, and a first ground terminal; the second part includes sequentially connecting a second connection joint, a second resistor, and a second ground terminal; Connecting two ends of the topology harness segment corresponding to the negative wiring harness to the first connection joint and the second connection joint respectively to form a negative wiring harness topology simulation model; The positive wiring harness topology simulation model and the positive wiring harness topology simulation model are used as the wiring harness topology simulation model of the wiring harness.

4. The wire harness radiation simulation method based on the magnetic ring impedance frequency response characteristics according to claim 3, characterized in that: The magnetic ring is sleeved on the negative electrode wiring harness on a side close to the vehicle battery pack.

5. The wire harness radiation simulation method based on the magnetic ring impedance frequency response characteristics according to claim 2, characterized in that: The dimension data includes the geometric radius and thickness of the core wire and insulation layer of the wiring harness; the material data includes conductivity, relative dielectric constant and loss tangent.

6. The wire harness radiation simulation method based on the magnetic ring impedance frequency response characteristics according to claim 1, characterized in that: Obtaining the impedance characteristics notebook document involves the following steps: Obtaining an impedance frequency response characteristic curve of the magnetic ring and reading out multiple sets of characteristic data; each set of characteristic data includes an impedance value and a frequency corresponding to the impedance value in the impedance frequency response characteristic curve; Multiple sets of characteristic data are numbered and sorted to form an impedance characteristic notepad document.

7. A wire harness radiation simulation system based on the frequency response characteristics of magnetic ring impedance, characterized in that: It includes: The first module is used to establish an electromagnetic simulation coupling model of a magnetic ring, a wiring harness, and a metal structure around the wiring harness; Establishing an electromagnetic simulation coupling model for a magnetic ring, a wiring harness, and a metal structure surrounding the wiring harness, including the following steps: establishing a three-dimensional electric field simulation model for the magnetic ring, the wiring harness, and the metal structure surrounding the wiring harness; establishing a wiring harness topology simulation model for the wiring harness, and then adding a variable impedance module corresponding to the magnetic ring to the wiring harness topology simulation model to form a new wiring harness topology simulation model; coupling the three-dimensional electric field simulation model and the new wiring harness topology simulation model to form an electromagnetic simulation coupling model; A second module is used to select measurement points around the electromagnetic simulation coupling model; The third module is used to use the excitation condition data and the impedance characteristic notepad document of the magnetic ring as simulation input data, and then perform electromagnetic simulation analysis in combination with the electromagnetic simulation coupling model to output a first electric field radiation value of the measuring point as a frequency variation curve graph; after obtaining the first electric field radiation value as a frequency variation curve graph, it also includes the following steps: cancel the magnetic ring in the electromagnetic simulation coupling model, and then use only the excitation condition data as simulation input data, and then perform electromagnetic simulation analysis in combination with the electromagnetic simulation coupling model to obtain a second electric field radiation value as a frequency variation curve graph; compare the second electric field radiation value as a frequency variation curve graph with the first electric field radiation value as a frequency variation curve graph to obtain the electric field radiation reduction value at different operating frequencies after adding the magnetic ring; the magnetic ring simulation input data includes the impedance characteristic notepad document of the magnetic ring.

8. The wire harness radiation simulation system based on the magnetic ring impedance frequency response characteristics according to claim 7, characterized in that: It also includes a fourth module, which is used to automatically call the impedance characteristic notepad document and combine it with the excitation condition data to form the simulation input data; the fourth module is also used to modify and store the impedance characteristic notepad document and the excitation condition data.

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