Radiation Emission Simulation Method and Device for the Three-Electricity Grounding System of Electric Vehicles

Abstract

The present application relates to the field of electromagnetic compatibility technology, and provides a method and device for simulating the radiation emission of a three-electricity grounding system of an electric vehicle. The method includes: establishing a body metal surface model according to the structural digital model of the body in the vehicle design document, establishing a component structure model according to the structural digital model of the electric system in the vehicle design document, and establishing a grounding network harness model according to the structural digital model of the harness in the vehicle design document; generating a simulation model of the three-electricity grounding system of the whole vehicle according to the body metal surface model, the component structure model, the grounding network harness model and the preset simulation boundary conditions; performing radiation emission simulation on the simulation model according to the preset simulation noise source, and obtaining the radiation emission result of the three-electricity grounding system of the whole vehicle. The method for simulating the radiation emission of the three-electricity grounding system of the electric vehicle provided by the embodiments of the present application can carry out the electromagnetic compatibility simulation of the whole vehicle in the early stage of the vehicle design stage, and complete the evaluation and optimization of the radiation emission performance of the whole vehicle.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic compatibility technology, and particularly relates to a method and device for simulating the radiation emission of a three-electricity grounding system of an electric vehicle. Background Art

[0002] As the core component of an electric vehicle, the three-electricity system directly affects the overall vehicle EMC performance in terms of the magnitude of the EMC (Electromagnetic Magnetic Compatibility) interference it generates. For the overall vehicle EMC, a good grounding design of the three-electricity grounding system is a relatively simple and effective method to solve the EMC problem. However, the grounding design of the three-electricity grounding system of the overall vehicle is very complex. If the design is unreasonable, it may directly or indirectly affect the electromagnetic compatibility performance of the overall vehicle. Therefore, the grounding design of the three-electricity grounding system can be evaluated through simulation.

[0003] In related technologies, the grounding wire harness model adopts an equivalent circuit method, and the simulation result is to analyze the coupling relationship to determine the radiation emission performance of the three-electricity grounding system of the overall vehicle. However, this method has insufficient integrity of the overall vehicle grounding system in the simulation model, resulting in poor accuracy of the simulation results. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the related technologies. For this purpose, the present application provides a method for simulating the radiation emission of a three-electricity grounding system of an electric vehicle, which can improve the accuracy of the simulation results.

[0005] The present application also provides a device for testing the radiation emission of a three-electricity grounding system of an electric vehicle.

[0006] The present application also provides an electronic device.

[0007] The present application also provides a computer-readable storage medium.

[0008] The method for simulating the radiation emission of a three-electricity grounding system of an electric vehicle according to the first aspect embodiment of the present application includes:

[0009] Establish a body metal surface model according to the body structural digital model in the overall vehicle design document, establish a component structural model according to the structural digital model of the electric system in the overall vehicle design document, and establish a grounding network wire harness model according to the structural digital model of the wire harness in the overall vehicle design document;

[0010] Generate a simulation model of the three-electricity grounding system of the overall vehicle according to the body metal surface model, the component structural model, the grounding network wire harness model, and the preset simulation boundary conditions;

[0011] Perform radiation emission simulation on the simulation model according to a preset simulation noise source to obtain the radiation emission results of the vehicle's three-electricity grounding system;

[0012] Among them, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model;

[0013] The electric system sub-model is established according to the structural digital model of the electrical components in the electric system, the bolt sub-model is established according to the structural digital model of the fixing bolts between the electrical components and the vehicle body in the electric system, and the bracket sub-model is established according to the structural digital model of the brackets of the electrical components in the electric system.

[0014] After constructing the simulation model of the vehicle's three-electricity grounding system through the structural digital model of the vehicle body, the structural digital model of the electric system, and the structural digital model of the wire harness in the vehicle design document, perform radiation emission simulation on the simulation model according to a preset simulation noise source to obtain the radiation emission results of the vehicle's three-electricity grounding system. Since the structural digital model of the electric system includes the structural digital models of electrical components, the fixing bolts between the electrical components and the vehicle body, and the brackets of the electrical components, the formed simulation model of the three-electricity grounding system considers the integrity of the vehicle grounding system, making the generated simulation model more accurate. Furthermore, after performing radiation emission simulation on the simulation model, the accuracy of the obtained simulation results is higher.

[0015] According to an embodiment of the present application, establishing a body metal surface model according to the structural digital model of the vehicle body in the vehicle design document includes:

[0016] Obtain the structural digital model of the vehicle body;

[0017] Extract the structural digital model of the metal surface of the vehicle body from the structural digital model of the vehicle body to establish the body metal surface model.

[0018] According to an embodiment of the present application, establishing a component structure model according to the structural digital model of the electric system in the vehicle design document includes:

[0019] Obtain the structural digital models of the electrical components in the electric system;

[0020] Extract the structural digital models of the outer shells of the electrical components from the structural digital models of the electrical components;

[0021] Establish a component structure model according to the structural digital models of the outer shells of the electrical components, the structural digital model of the fixing bolts between the electrical components and the vehicle body, and the structural digital models of the brackets of the electrical components.

[0022] According to an embodiment of the present application, the wire harness includes a grounding wire harness and a high-voltage wire harness;

[0023] Establish a grounding network harness model according to the structural digital model of the harness in the vehicle design document, including:

[0024] Establish a grounding harness sub-model according to the structural digital model of the grounding harness in the vehicle design document;

[0025] Establish a high-voltage harness sub-model according to the structural digital model of the high-voltage harness in the vehicle design document;

[0026] Determine the grounding network harness model according to the grounding harness sub-model and the high-voltage harness sub-model.

[0027] According to an embodiment of the present application, establishing a high-voltage harness sub-model according to the structural digital model of the high-voltage harness in the vehicle design document includes:

[0028] Determine that the core wire in the structural digital model of the high-voltage harness is a multi-core wire, obtain the structural digital model of a single-core wire with the same cross-sectional area as the multi-core wire, and establish the high-voltage harness sub-model;

[0029] Determine that the shielding layer in the structural digital model of the high-voltage harness is a double-layer shielding structure composed of a braided mesh and aluminum foil, obtain the structural digital model of the aluminum foil from the structural digital model of the double-layer shielding structure, and establish the high-voltage harness sub-model; or,

[0030] Determine that the shielding layer of the structural digital model of the high-voltage harness is a single-layer shielding structure formed by a braided mesh, obtain the structural digital model of aluminum foil with the same thickness as the single-layer shielding structure, and establish the high-voltage harness sub-model.

[0031] According to an embodiment of the present application, it further includes:

[0032] Obtain the voltage collected by the artificial power network during the conducted interference test of the electric drive system of the electric vehicle;

[0033] Determine the preset simulation noise source according to the test voltage.

[0034] According to an embodiment of the present application, perform a radiation emission simulation on the simulation model according to the preset simulation noise source to obtain the radiation emission result of the vehicle's three-electricity grounding system, including:

[0035] Perform a radiation emission simulation on the simulation model according to the preset simulation noise source to obtain the field strength frequency domain value of the target point at a preset distance from the simulation model;

[0036] Compare the field strength frequency domain value with the preset standard specification limit value to obtain the radiation emission result of the three-electricity grounding system.

[0037] The radiation emission simulation device for the three-electricity grounding system of an electric vehicle according to the second aspect embodiment of the present application includes:

[0038] A model establishment module, configured to establish a body metal surface model according to the structural digital model of the body in the vehicle design document, establish a component structure model according to the structural digital model of the electric system in the vehicle design document, and establish a grounding network harness model according to the structural digital model of the harness in the vehicle design document;

[0039] A model generation module, configured to generate a simulation model of the vehicle's three-electricity grounding system according to the body metal surface model, the component structure model, the harness model, and a preset simulation boundary condition;

[0040] An emission simulation module, configured to perform radiation emission simulation on the simulation model according to a preset simulation noise source, and obtain the radiation emission result of the vehicle's three-electricity grounding system;

[0041] Wherein, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model;

[0042] The electric system sub-model is established according to the structural digital model of the electrical components in the electric system, the bolt sub-model is established according to the structural digital model of the fixing bolts between the electrical components and the body in the electric system, and the bracket sub-model is established according to the structural digital model of the brackets of the electrical components in the electric system.

[0043] An electronic device according to the third aspect embodiment of the present application includes a processor and a memory storing a computer program. When the processor executes the computer program, the radiation emission simulation method for the three-electricity grounding system of the electric vehicle described in any of the above embodiments is implemented.

[0044] A computer-readable storage medium according to the fourth aspect embodiment of the present application, on which a computer program is stored. When the computer program is executed by a processor, the radiation emission simulation method for the three-electricity grounding system of the electric vehicle described in any of the above embodiments is implemented.

[0045] A computer program vehicle according to the fifth aspect embodiment of the present application includes: When the computer program is executed by a processor, the radiation emission simulation method for the three-electricity grounding system of the electric vehicle described in any of the above embodiments is implemented.

[0046] One or more of the above technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0047] After constructing a simulation model of the vehicle's three-electricity grounding system using the structural digital models of the vehicle body, the electric system, and the wiring harness in the vehicle design documents, radiation emission simulation is performed on the simulation model according to the preset simulation noise sources to obtain the radiation emission results of the vehicle's three-electricity grounding system. Since the structural digital model of the electric system includes the structural digital models of electrical components, the fixing bolts between the electrical components and the vehicle body, and the brackets of the electrical components, the formed simulation model of the vehicle's three-electricity grounding system takes into account the integrity of the vehicle's grounding system and makes the generated simulation model more accurate. As a result, after the radiation emission simulation is performed on the simulation model, the accuracy of the obtained simulation results is higher.

[0048] Furthermore, by extracting the structural digital model of the metal surface of the vehicle body from the structural digital model of the vehicle body, a vehicle body metal surface model that ignores the metal thickness is established, thereby reducing the number of meshes to be generated during calculation, shortening the calculation time, and further improving the simulation efficiency.

[0049] Furthermore, by extracting the structural digital model of the outer shell of the electrical components from the structural digital model of the electrical components, and based on the structural digital models of the outer shells of the electrical components, the fixing bolts between the electrical components and the vehicle body, and the brackets of the electrical components, a component structure model is established, thereby ensuring the integrity of the vehicle's grounding system and further improving the accuracy of the simulation.

[0050] Furthermore, by extracting the structural digital model of the multi-core wires of the high-voltage wiring harness from the structural digital model of the high-voltage wiring harness, equivalent substitution is performed with single-core wires of the same area size, and the braided mesh structure of the shielding layer is cancelled and only the aluminum foil shielding structure is retained to establish a high-voltage wiring harness model, thereby reducing the mesh quantity of the wiring harness, shortening the calculation time, and improving the simulation efficiency.

[0051] Furthermore, by obtaining the voltage collected by the artificial power network during the conducted interference test of the electric drive system of the electric vehicle, and determining the preset simulation noise sources according to the test voltage, the obtained preset simulation noise sources can not only restore the electromagnetic noise under the real working conditions of the vehicle and improve the simulation accuracy, but also enable the evaluation of the electromagnetic compatibility performance of the whole vehicle through simulation in the early stage of vehicle design.

[0052] Furthermore, by obtaining the field strength frequency domain value of the target point at a preset distance from the simulation model and comparing the field strength frequency domain value with the preset standard specification limit value, it can be directly determined whether the radiation emission result of the three-electricity grounding system meets the standard requirements. If there is a risk of exceeding the standard, the design scheme can be rectified and optimized in advance to avoid the risk of vehicle delay in listing caused by the failure of the whole vehicle to meet the national standard requirements during the later test. Description of the Drawings

[0053] To more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0054] Figure 1 is a schematic flowchart of a radiation emission test method for an electric vehicle's three-electricity grounding system provided by an embodiment of the present application;

[0055] Figure 2 is a schematic structural diagram of a body metal surface model provided by an embodiment of the present application;

[0056] Figure 3 is a schematic diagram of a noise source curve provided by an embodiment of the present application;

[0057] Figure 4 is a schematic diagram of a radiation emission result provided by an embodiment of the present application;

[0058] Figure 5 is a schematic structural diagram of a radiation emission test device for an electric vehicle's three-electricity grounding system provided by an embodiment of the present application;

[0059] Figure 6 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0060] To make the objectives, technical solutions, and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present application belong to the scope of protection of the present application.

[0061] Next, the radiation emission simulation method and device for an electric vehicle's three-electricity grounding system provided by the embodiments of the present application will be introduced and described in detail through several specific embodiments.

[0062] In one embodiment, a radiation emission simulation method for an electric vehicle's three-electricity grounding system is provided. This method is applied to a server and is used to perform radiation emission simulation for the electric vehicle's three-electricity grounding system. Among them, the server can be implemented by an independent server or a server cluster composed of multiple servers, and can also be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence sampling point devices.

[0063] As Figure 1 shown, a radiation emission simulation method for the three-electricity grounding system of an electric vehicle provided in this embodiment includes:

[0064] Step 101, establish a body metal surface model according to the structural digital model of the body in the vehicle design document, establish a component structure model according to the structural digital model of the electric system in the vehicle design document, and establish a grounding network harness model according to the structural digital model of the harness in the vehicle design document;

[0065] Step 102, generate a simulation model of the vehicle's three-electricity grounding system according to the body metal surface model, the component structure model, the grounding network harness model, and the preset simulation boundary conditions;

[0066] Step 103, perform radiation emission simulation on the simulation model according to the preset simulation noise source, and obtain the radiation emission result of the vehicle's three-electricity grounding system;

[0067] Among them, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model;

[0068] The electric system sub-model is established according to the structural digital model of the electrical components in the electric system, the bolt sub-model is established according to the structural digital model of the fixing bolts between the electrical components and the body in the electric system, and the bracket sub-model is established according to the structural digital model of the brackets of the electrical components in the electric system.

[0069] After constructing a simulation model of the vehicle's three-electricity grounding system through the structural digital model of the body, the structural digital model of the electric system, and the structural digital model of the harness in the vehicle design document, perform radiation emission simulation on the simulation model according to the preset simulation noise source to obtain the radiation emission result of the vehicle's three-electricity grounding system. Since the structural digital model of the electric system includes the structural digital models of electrical components, the fixing bolts between the electrical components and the body, and the brackets of the electrical components, the generated simulation model of the vehicle's three-electricity grounding system considers the integrity of the vehicle grounding system, making the generated simulation model more accurate, and further making the accuracy of the simulation result higher after performing radiation emission simulation on the simulation model.

[0070] In one embodiment, the structural digital model refers to a three-dimensional model of the structure. Before performing radiation emission simulation, the server pre-obtains the vehicle design document of the electric vehicle, which includes the three-dimensional models of any component or structure of the electric vehicle. After obtaining the vehicle design document, obtain the structural digital model of the body of the electric vehicle, the structural digital model of the electric system, and the structural digital model of the harness from the vehicle design document to establish a body metal surface model, a component structure model, and a harness model respectively.

[0071] Since the digital model of the vehicle body structure is a shell model and the shell has a thickness, if the mesh generation is directly carried out, a large number of meshes will be formed, prolonging the calculation time of the subsequent model and thus affecting the simulation efficiency. Therefore, in order to improve the simulation efficiency, in one embodiment, the metal surface model of the vehicle body is established according to the digital model of the vehicle body structure in the vehicle design document, including:

[0072] Obtain the digital model of the vehicle body structure;

[0073] Extract the digital model of the metal surface of the vehicle body from the digital model of the vehicle body structure and establish the metal surface model of the vehicle body.

[0074] In one embodiment, after obtaining the digital model of the vehicle body structure from the vehicle design document, considering the skin effect of the current distribution, the current will only be distributed on the surface of the metal. Therefore, the digital model of the vehicle body structure is simplified to establish the vehicle body model as a metal surface model that ignores the metal thickness. The finally formed metal surface model of the vehicle body can be as shown in Figure 2 shown.

[0075] By establishing a metal surface model of the vehicle body that ignores the metal thickness from the digital model of the vehicle body structure, the number of meshes to be generated during the calculation is reduced, the calculation time is shortened, and the simulation efficiency is further improved.

[0076] In one embodiment, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model. Among them, for the establishment of the electric system sub-model, the digital models of electrical components such as electric drives, power supplies, and batteries are obtained from the vehicle design document, and the electric system sub-model is established according to the digital models of the electric drives, power supplies, and batteries. For the establishment of the bolt sub-model, the digital model of the fixing bolts between the electrical components and the vehicle body is obtained from the vehicle design document to establish the bolt sub-model. For the establishment of the bracket sub-model, the digital models of the brackets of electrical components such as electric drives, power supplies, and batteries are obtained from the vehicle design document to establish the bracket sub-model.

[0077] And to further improve the calculation efficiency, in one embodiment, according to the digital model of the electric system in the vehicle design document, a component structure model is established, including:

[0078] Obtain the digital models of the electrical components in the electric system;

[0079] Extract the digital models of the outer shells of the electrical components from the digital models of the electrical components;

[0080] Establish a component structure model according to the digital models of the outer shells of the electrical components, the digital model of the fixing bolts between the electrical components and the vehicle body, and the digital models of the brackets of the electrical components.

[0081] In one embodiment, for the establishment of the electric system sub-model, the structural digital models of each electrical component, such as the electric drive, power supply, and battery, can be obtained from the vehicle design document. Then, the structural digital models of each electrical component are simplified by extracting only the structural digital model of the outer shell of each electrical component, ignoring its internal details, and an electric system sub-model is established based on the structural digital model of the outer shell of each electrical component. For the establishment of the bolt sub-model, the structural digital model of the fixing bolts between the outer shell of each electrical component and the vehicle body of the electric vehicle can be obtained from the vehicle design document to establish the bolt sub-model. For the establishment of the bracket sub-model, the structural digital model of the bracket of the outer shell of each electrical component can be obtained from the vehicle design document to establish the bracket sub-model. After establishing the electric system sub-model, bolt sub-model, and bracket sub-model, the electric system sub-model, bolt sub-model, and bracket sub-model can be combined to form a component structure model.

[0082] By extracting the structural digital model of the outer shell of the electrical component from the structural digital model of the electrical component and establishing a component structure model based on the structural digital model of the outer shell of each electrical component, the structural digital model of the fixing bolts between the electrical component and the vehicle body, and the structural digital model of the bracket of each electrical component, the internal structure of the electrical component is ignored during modeling, thereby shortening the calculation time and improving the simulation efficiency.

[0083] In one embodiment, the wire harness includes a ground wire harness and a high-voltage wire harness;

[0084] According to the structural digital model of the wire harness in the vehicle design document, a grounding network wire harness model is established, including:

[0085] According to the structural digital model of the ground wire harness in the vehicle design document, a ground wire harness sub-model is established;

[0086] According to the structural digital model of the high-voltage wire harness in the vehicle design document, a high-voltage wire harness sub-model is established;

[0087] According to the ground wire harness sub-model and the high-voltage wire harness sub-model, the wire harness model is determined.

[0088] In one embodiment, for the establishment of the grounding network wire harness model, the structural digital models of the ground wire harness and the high-voltage wire harness in the vehicle design document can be obtained. After obtaining the structural digital models of the ground wire harness and the high-voltage wire harness, a ground wire harness sub-model can be established according to the actual digital model structure of the ground wire harness, or a high-voltage wire harness sub-model can be established according to the actual digital model structure of the high-voltage wire harness.

[0089] To further improve the calculation efficiency, in one embodiment, after obtaining the structural digital model of the high-voltage harness, if the core wire in the structural digital model of the high-voltage harness is a multi-core wire, the core wire adopts the structural digital model of a single-core wire with the same area as the multi-core wire to establish a sub-model of the high-voltage harness; if the shielding layer in the structural digital model of the high-voltage harness is a double-layer shielding structure composed of a braided mesh and aluminum foil, the structural digital model of the aluminum foil is obtained from the structural digital model of the double-layer shielding structure to establish a sub-model of the high-voltage harness; if the shielding layer in the structural digital model of the high-voltage harness is a single-layer shielding structure of a braided mesh, the structural digital model of aluminum foil with the same thickness as the braided mesh structure is used to establish a sub-model of the high-voltage harness.

[0090] After establishing the body metal surface model, component structure model, and grounding network harness model, preset simulation boundary conditions are added to form a simulation model of the vehicle's three-electricity grounding system.

[0091] Among them, the preset simulation boundary conditions include the boundary conditions of the body model and the radiation boundary conditions of the air box in the solution domain. Since the body is modeled as a metal surface structure and materials cannot be directly assigned, it is necessary to set the materials by setting the boundary conditions. Among them, the material properties of the boundary conditions can be set according to the actual situation. Secondly, considering that the actual vehicle radiation test is carried out in an anechoic chamber, its function is to avoid clutter interference, improve accuracy and efficiency. In fact, only 5 sides of the anechoic chamber are covered with absorbing materials, and the ground plane is not covered with absorbing materials. Therefore, the air box also needs to be set according to this condition, rather than setting all 6 sides as radiation boundary conditions.

[0092] After generating the simulation model of the vehicle's three-electricity grounding system, the radiation emission simulation of the simulation model of the vehicle's three-electricity grounding system can be carried out according to the preset simulation noise source of the vehicle's three-electricity grounding system set in advance. Among them, the preset simulation noise source can be the relevant noise sources collected on the actual vehicle. However, when collecting relevant noise sources on the actual vehicle as the preset simulation noise source, it can only be obtained for simulation in the later stage of vehicle manufacturing and cannot be simulated in the vehicle design stage to evaluate the radiation emission performance of the vehicle's three-electricity grounding system in advance, resulting in the normal market launch of the vehicle being affected if the radiation emission result does not meet the national standard requirements.

[0093] Therefore, in one embodiment, the acquisition of the preset simulation noise source includes:

[0094] Obtain the voltage collected by the artificial power network during the conducted interference test of the electric drive system of the electric vehicle;

[0095] Determine the preset simulation noise source according to the test voltage.

[0096] In one embodiment, the test voltages collected at the positive and negative poles of the artificial power network of the electric drive system during the conducted interference test are acquired in advance to determine the peak value of the conducted emission characteristics of the high-voltage positive and negative power supply lines of the electric drive system, and this peak value of the conducted emission characteristics is used as the preset simulation noise source for the vehicle's electric radiation emission simulation. At this time, the curve of the noise source can be as shown in Figure 3 shown. Among them, for the electric drive conducted interference test, the bench setup and test are carried out based on the CISPR25 standard. This method can not only restore the electromagnetic noise under the real working conditions of the vehicle and improve the simulation accuracy, but also evaluate the electromagnetic compatibility performance of the vehicle through simulation in the early stage of vehicle design.

[0097] By acquiring the test voltages collected by the artificial power network of the electric drive system during the electric drive conducted interference test and determining the preset simulation noise source according to the test voltages, the obtained preset simulation noise source can not only restore the electromagnetic noise under the real working conditions of the vehicle and improve the simulation accuracy, but also evaluate the electromagnetic compatibility performance of the vehicle through simulation in the early stage of vehicle design.

[0098] After obtaining the preset simulation noise source, the radiation emission simulation of the simulation model can be carried out according to this preset simulation noise source to obtain the radiation emission results of the vehicle's three-electricity grounding system. In one embodiment, after performing the radiation emission simulation on the simulation model according to the preset simulation noise source, according to the preset standard requirements, such as the requirements of the GB 18387 standard, the field strength frequency domain values of the target points at a preset distance from the simulation model are obtained. For example, the field strength frequency domain values of the target points 3 m away from the simulation model are obtained, and then the obtained field strength frequency domain values are compared with the preset standard specification limits, such as the preset standard specification limits in the GB18387 standard, to obtain the radiation emission results of the vehicle's three-electricity grounding system.

[0099] Specifically, after obtaining the field strength frequency domain values, through data conversion, the field strength frequency domain values can be converted into a frequency domain curve in dBuV, and then compared with the preset standard specification limits. If the values of each point in the frequency domain curve are all less than the preset standard specification limits, it means that there is no risk of exceeding the standard in the radiation emission of the vehicle's three-electricity grounding system; otherwise, it means that there is a risk of exceeding the standard in the radiation emission of the vehicle's three-electricity grounding system. At this time, the design scheme can be rectified and optimized in advance, and the obtained radiation emission results can provide positive guidance for electromagnetic compatibility design, saving the vehicle design and development cycle and cost.

[0100] As shown in Figure 4 shown, the frequency domain curve converted from the field strength frequency domain values, with the curve lower than the preset standard specification limits, indicates that there is no risk of exceeding the standard in the radiation emission of the vehicle's three-electricity grounding system at this time.

[0101] The radiation emission simulation device of the electric vehicle's three-electricity grounding system provided by this application will be described below. The radiation emission simulation device of the electric vehicle's three-electricity grounding system described below can be correspondingly referred to the radiation emission simulation method of the electric vehicle's three-electricity grounding system described above.

[0102] In one embodiment, as Figure 5 shown, a radiation emission simulation device of an electric vehicle's three-electricity grounding system is provided, including:

[0103] A model establishment module 210, configured to establish a body metal surface model according to the structural digital model of the body in the vehicle design document, establish a component structure model according to the structural digital model of the electric system in the vehicle design document, and establish a grounding network harness model according to the structural digital model of the harness in the vehicle design document;

[0104] A model generation module 220, configured to generate a simulation model of the vehicle's three-electricity grounding system according to the body metal surface model, the component structure model, the grounding network harness model, and a preset simulation boundary condition;

[0105] A radiation emission simulation module 230, configured to perform radiation emission simulation on the simulation model according to a preset simulation noise source, and obtain the radiation emission result of the vehicle's three-electricity grounding system;

[0106] Wherein, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model;

[0107] The electric system sub-model is established according to the structural digital model of the electrical components in the electric system, the bolt sub-model is established according to the structural digital model of the fixing bolts between the electrical components and the body in the electric system, and the bracket sub-model is established according to the structural digital model of the brackets of the electrical components in the electric system.

[0108] After constructing the simulation model of the vehicle's three-electricity grounding system through the structural digital model of the body, the structural digital model of the electric system, and the structural digital model of the harness in the vehicle design document, perform radiation emission simulation on the simulation model according to a preset simulation noise source to obtain the radiation emission result of the vehicle's three-electricity grounding system. And since the structural digital model of the electric system includes the structural digital models of the electrical components, the fixing bolts between the electrical components and the body, and the brackets of the electrical components, the formed simulation model of the vehicle's three-electricity grounding system considers the integrity of the vehicle grounding system, making the generated simulation model more accurate, and further making the accuracy of the simulation result higher after performing radiation emission simulation on the simulation model.

[0109] In one embodiment, the model establishment module 210 is specifically configured to:

[0110] Obtain the structural digital model of the vehicle body;

[0111] Extract the structural digital model of the metal surface of the vehicle body from the structural digital model of the vehicle body, and establish the vehicle body metal surface model.

[0112] In one embodiment, the model establishment module 210 is specifically configured to:

[0113] Obtain the structural digital models of the electrical components in the electric system;

[0114] Extract the structural digital models of the outer shells of the electrical components from the structural digital models of the electrical components;

[0115] Establish a component structure model according to the structural digital models of the outer shells of the electrical components, the structural digital models of the fixing bolts between the electrical components and the vehicle body, and the structural digital models of the brackets of the electrical components.

[0116] In one embodiment, the wire harness includes a grounding wire harness and a high-voltage wire harness;

[0117] The model establishment module 210 is specifically configured to:

[0118] Establish a grounding wire harness sub-model according to the structural digital model of the grounding wire harness in the vehicle design document;

[0119] Establish a high-voltage wire harness sub-model according to the structural digital model of the high-voltage wire harness in the vehicle design document;

[0120] Determine the grounding network wire harness model according to the grounding wire harness sub-model and the high-voltage wire harness sub-model.

[0121] In one embodiment, the model establishment module 210 is specifically configured to:

[0122] Determine that the core wire in the structural digital model of the high-voltage wire harness is a multi-core wire, obtain the structural digital model of a single-core wire with the same cross-sectional area as the multi-core wire, and establish the high-voltage wire harness sub-model;

[0123] Determine that the shielding layer in the structural digital model of the high-voltage wire harness is a double-layer shielding structure composed of a braided mesh and aluminum foil, obtain the structural digital model of the aluminum foil from the structural digital model of the double-layer shielding structure, and establish the high-voltage wire harness sub-model; or,

[0124] Determine that the shielding layer in the structural digital model of the high-voltage wire harness is a single-layer shielding structure formed by a braided mesh, obtain the structural digital model of aluminum foil with the same thickness as the single-layer shielding structure, and establish the high-voltage wire harness sub-model.

[0125] In one embodiment, the emission simulation module 230 is further configured to:

[0126] Obtain the voltage collected by the artificial power network during the conducted interference test of the electric drive system of an electric vehicle;

[0127] Determine the preset simulation noise source according to the test voltage.

[0128] In one embodiment, the emission simulation module 230 is specifically configured to:

[0129] Perform radiation emission simulation on the simulation model according to the preset simulation noise source, and obtain the field strength frequency domain value of the target point at a preset distance from the simulation model;

[0130] Compare the field strength frequency domain value with the preset standard specification limit value to obtain the radiation emission result of the vehicle's three-electricity grounding system.

[0131] Figure 6 Illustrate a schematic diagram of the physical structure of an electronic device, as Figure 6 shown. The electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communication interface 820, and the memory 830 complete mutual communication through the communication bus 840. The processor 810 can call the computer program in the memory 830 to execute the radiation emission simulation method for the vehicle's three-electricity grounding system, for example, including:

[0132] Establish a body metal surface model according to the structural digital model of the body in the vehicle design document, establish a component structure model according to the structural digital model of the electric system in the vehicle design document, and establish a grounding network harness model according to the structural digital model of the harness in the vehicle design document;

[0133] Generate a simulation model of the vehicle's three-electricity grounding system according to the body metal surface model, the component structure model, the grounding network harness model, and the preset simulation boundary conditions;

[0134] Perform radiation emission simulation on the simulation model according to the preset simulation noise source to obtain the radiation emission result of the vehicle's three-electricity grounding system;

[0135] Among them, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model;

[0136] The electric system sub-model is established according to the structural digital model of the electrical components in the electric system, the bolt sub-model is established according to the structural digital model of the fixing bolts between the electrical components and the body in the electric system, and the bracket sub-model is established according to the structural digital model of the brackets of the electrical components in the electric system.

[0137] In addition, the logical instructions in the aforementioned memory 830 can be implemented in the form of software functional units. When sold or used independently as a vehicle, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of software for a vehicle. This computer software for a vehicle is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, external hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0138] On the other hand, an embodiment of this application also provides a storage medium. The storage medium includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the radiation emission simulation method for the three-electricity grounding system of an electric vehicle provided in the above-mentioned various embodiments. For example, it includes:

[0139] According to the body structure digital model in the vehicle design document, establish a body metal surface model, and according to the structure digital model of the electric system in the vehicle design document, establish a component structure model, and according to the structure digital model of the wiring harness in the vehicle design document, establish a grounding network wiring harness model;

[0140] According to the body metal surface model, the component structure model, the grounding network wiring harness model, and the preset simulation boundary conditions, generate a simulation model of the vehicle's three-electricity grounding system;

[0141] According to the preset simulation noise source, perform radiation emission simulation on the simulation model to obtain the radiation emission results of the vehicle's three-electricity grounding system;

[0142] Among them, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model;

[0143] The electric system sub-model is established according to the structure digital model of the electrical components in the electric system. The bolt sub-model is established according to the structure digital model of the fixing bolts between the electrical components and the body in the electric system. The bracket sub-model is established according to the structure digital model of the brackets of the electrical components in the electric system.

[0144] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0145] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of software, and this computer software can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A radiation emission simulation method for the three-electricity grounding system of an electric vehicle, characterized in that Including: Establish a body metal surface model based on the structural digital model of the body in the vehicle design document, establish a component structure model based on the structural digital model of the electric system in the vehicle design document, and establish a grounding network harness model based on the structural digital model of the harness in the vehicle design document; Generate a simulation model of the vehicle's three-electricity grounding system based on the body metal surface model, the component structure model, the grounding network harness model, and preset simulation boundary conditions; Conduct a radiation emission simulation on the simulation model according to a preset simulation noise source to obtain the radiation emission results of the vehicle's three-electricity grounding system; Among them, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model; The electric system sub-model is established based on the structural digital model of the electrical components in the electric system, the bolt sub-model is established based on the structural digital model of the fixing bolts between the electrical components and the body in the electric system, and the bracket sub-model is established based on the structural digital model of the brackets of the electrical components in the electric system.

2. The radiation emission simulation method of the three-electricity grounding system of an electric vehicle according to claim 1, wherein The establishing of the body metal surface model according to the structural digital model of the body in the vehicle design document includes: Obtain the structural digital model of the body; Extract the structural digital model of the metal surface of the body from the structural digital model of the body to establish the body metal surface model.

3. The radiation emission simulation method for the three-electricity grounding system of an electric vehicle according to claim 1, wherein The establishing of the component structure model according to the structural digital model of the electric system in the vehicle design document includes: Obtain the structural digital models of the electrical components in the electric system; Extract the structural digital models of the housings of the electrical components from the structural digital models of the electrical components; Establish a component structure model according to the structural digital models of the housings of the electrical components, the structural digital models of the fixing bolts between the electrical components and the body, and the structural digital models of the brackets of the electrical components.

4. The radiation emission simulation method for the three-electricity grounding system of an electric vehicle according to claim 1, characterized in that The harness includes a grounding harness and a high-voltage harness; The establishing of the grounding network harness model according to the structural digital model of the harness in the vehicle design document includes: Establish a grounding harness sub-model according to the structural digital model of the grounding harness in the vehicle design document; Establish a high-voltage harness sub-model according to the structural digital model of the high-voltage harness in the vehicle design document; Determine the grounding network harness model according to the grounding harness sub-model and the high-voltage harness sub-model.

5. The radiation emission simulation method of the three-electricity grounding system of an electric vehicle according to claim 4, characterized in that The establishing of the high-voltage harness sub-model according to the structural digital model of the high-voltage harness in the vehicle design document includes: Determine that the core wire in the structural digital model of the high-voltage harness is a multi-core wire, obtain the core wire structural digital model of a single-core wire with the same cross-sectional area as the multi-core wire, and establish the high-voltage harness sub-model; Determine that the shielding layer in the structural digital model of the high-voltage harness is a double-layer shielding structure composed of a braided mesh and aluminum foil, obtain the structural digital model of the aluminum foil from the structural digital model of the double-layer shielding structure, and establish the high-voltage harness sub-model; or, Determine that the shielding layer in the structural digital model of the high-voltage harness is a single-layer shielding structure formed by a braided mesh, obtain the structural digital model of aluminum foil with the same thickness as the single-layer shielding structure, and establish the high-voltage harness sub-model.

6. The radiation emission simulation method for the three-electricity grounding system of an electric vehicle according to claim 1, characterized in that, Also including: Obtain the voltage collected by the artificial power network during the conducted interference test of the electric drive system of an electric vehicle. Determine the preset simulation noise source according to the voltage collected by the artificial power network.

7. The radiation emission simulation method for the three-electricity grounding system of an electric vehicle according to any one of claims 1-6, characterized in that, According to the preset simulation noise source, perform a radiation emission simulation on the simulation model to obtain the radiation emission results of the vehicle's three-electricity grounding system, including: According to the preset simulation noise source, perform a radiation emission simulation on the simulation model to obtain the field strength frequency domain value of a target point at a preset distance from the simulation model. Compare the field strength frequency domain value with the preset standard specification limit to obtain the radiation emission results of the vehicle's three-electricity grounding system.

8. A radiation emission simulation device for the three-electricity grounding system of an electric vehicle, characterized in that, Including: A model establishment module for establishing a body metal surface model according to the structural digital model of the body in the vehicle design document, establishing a component structure model according to the structural digital model of the electric system in the vehicle design document, and establishing a grounding network wire harness model according to the structural digital model of the wire harness in the vehicle design document. A model generation module for generating a simulation model of the vehicle's three-electricity grounding system according to the body metal surface model, the component structure model, the grounding network wire harness model, and the preset simulation boundary conditions. A radiation emission simulation module for performing a radiation emission simulation on the simulation model according to the preset simulation noise source to obtain the radiation emission results of the vehicle's three-electricity grounding system. Among them, the component structure model includes an electric system sub-model, a bolt sub-model, and a bracket sub-model. The electric system sub-model is established according to the structural digital model of the electrical components in the electric system, the bolt sub-model is established according to the structural digital model of the fixing bolts between the electrical components and the body in the electric system, and the bracket sub-model is established according to the structural digital model of the brackets of the electrical components in the electric system.

9. An electronic device, comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the radiation emission simulation method of the three-electricity grounding system of the electric vehicle according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the radiation emission simulation method of the three-electricity grounding system of the electric vehicle according to any one of claims 1 to 7.

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