Electromagnetic environment simulation method, system and equipment for electric automobile wiring harness

Abstract

The invention discloses an electromagnetic environment simulation method, system and device for an electric vehicle wire harness, and belongs to the technical field of vehicles. The simulation method comprises the following steps: acquiring working condition information of the electric vehicle, and determining electromagnetic environment information, simulation tasks and simulation parameters of the wiring harness according to the working condition information; constructing a simulation model according to the electromagnetic environment information of the wiring harness; and performing simulation solution calculation on the simulation model according to the simulation parameters, the simulation task and the solution algorithm to obtain a simulation result. The vehicle has different electromagnetic environments under different working conditions, and the electromagnetic environment information, the simulation task and the simulation parameters of the wiring harness are determined according to the working condition information, so that the simulation data can better fit the actual condition of the vehicle under the corresponding working condition, and the simulation data can more truly simulate the actual condition of the vehicle; the authenticity and the accuracy of a simulation result are improved, and the electromagnetic compatibility risk is really avoided. In addition, electromagnetic environment simulation analysis under different working conditions has definiteness and simplification, and simulation efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method, system and device for simulating the electromagnetic environment of an electric vehicle wiring harness. Background Art

[0002] With the development of electric vehicles, due to the characteristics of high voltage, high current and high switching frequency of high voltage system, the electromagnetic interference of high voltage components leads to frequent electromagnetic compatibility problems of the whole vehicle, and electromagnetic compatibility development and testing are becoming more and more important. High voltage wire harness is the transmission carrier of electrical signals and the propagation path of electromagnetic interference in high voltage system, which affects the electromagnetic compatibility performance of the whole vehicle through coupling crosstalk and radiation emission between wire harnesses.

[0003] To address the above issues, the electromagnetic compatibility performance can be analyzed by using simulation software after building a vehicle model, and electromagnetic compatibility risks can be discovered and resolved during the design phase. However, the simulation results are often quite different from the actual vehicle conditions, making it difficult to truly avoid electromagnetic compatibility risks. Summary of the invention

[0004] The purpose of the present invention is to provide a method, system and device for simulating the electromagnetic environment of an electric vehicle wiring harness, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] A technical solution adopted to solve the above technical problems provides a method for simulating the electromagnetic environment of an electric vehicle's wiring harness, comprising: obtaining the operating condition information of the electric vehicle, determining the electromagnetic environment information, simulation tasks and simulation parameters of the electric vehicle's wiring harness according to the operating condition information; constructing a simulation model according to the electromagnetic environment information of the wiring harness; performing simulation solution calculations on the simulation model according to the simulation parameters, the simulation tasks and the solution algorithm to obtain simulation results.

[0006] This technical solution has at least the following beneficial effects: vehicles have different electromagnetic environments under different working conditions. Determining the electromagnetic environment information of the wire harness, simulation tasks and simulation parameters according to the working condition information can make the simulation data more in line with the actual situation of the vehicle under the corresponding working condition, so that the simulation data can simulate the actual situation of the vehicle more realistically, improve the authenticity and accuracy of the simulation results, and truly avoid electromagnetic compatibility risks. In addition, the simulation analysis of the electromagnetic environment under different working conditions is clear and simplified, which can improve the simulation efficiency.

[0007] Optionally, the operating condition information includes: driving condition, which is a working mode in which the power battery provides power output to the electric drive and other high-voltage assemblies; charging condition, which is a working mode in which an external charging device provides power output to the power battery; external discharge condition, which is a working mode in which the power battery provides power output to an external electrical device. The vehicle's operating modes are divided into three categories: driving condition, charging condition, and external discharge condition. Targeted simulation processing is performed for these three categories of conditions, which can avoid most of the electromagnetic compatibility risks under normal use of the vehicle and improve the efficiency of simulation processing.

[0008] Optionally, the determining of the electromagnetic environment information of the wire harness, the simulation task and the simulation parameters according to the operating condition information includes: determining the electromagnetic environment information of the wire harness, the simulation task and the simulation parameters according to the operating condition information and the whole vehicle control strategy. The operating mode of the vehicle can be determined by the operating condition information and the whole vehicle control strategy. In this operating mode, which components are in working state, which operations are being performed, which state they are in and which parameters they have, etc., so as to more clearly understand the electromagnetic environment of the vehicle under actual operation. The electromagnetic environment information of the wire harness, the simulation task and the simulation parameters determined by using this information can better fit the actual electromagnetic environment of the vehicle, ensure the matching of simulation and reality, and improve the accuracy of simulation results.

[0009] Optionally, the electromagnetic environment information of the wire harness includes interference sources, transmission paths and sensitive equipment, and constructing a simulation model based on the electromagnetic environment information of the wire harness includes: constructing a three-dimensional mechanical model based on the electromagnetic environment information of the wire harness; extracting the interference source and the shell of the sensitive equipment based on the three-dimensional mechanical model, and extracting the wire harness center line of the transmission path to obtain a simulation model.

[0010] Optionally, the simulation results include radiated electromagnetic field intensity and coupled crosstalk noise, and the simulation method further includes: obtaining the interference tolerance threshold of the device and the standard limit threshold of the disturbed wiring harness; when the maximum value of the radiated electromagnetic field intensity is lower than the interference tolerance threshold and the maximum value of the coupled crosstalk noise is lower than the standard limit threshold, determining that the simulation results meet the electromagnetic compatibility requirements; when the maximum value of the radiated electromagnetic field intensity is greater than or equal to the preset interference tolerance threshold or the maximum value of the coupled crosstalk noise is higher than or equal to the preset standard limit threshold, determining that the simulation results do not meet the electromagnetic compatibility requirements.

[0011] Optionally, the simulation method further includes, when the simulation result does not meet the electromagnetic compatibility requirements, performing at least one of the following forward optimization operations on the features that do not meet the conditions in the simulation model: changing the wiring harness layout to reduce the electromagnetic impact; changing the wiring harness parameters to reduce the electromagnetic environment; enhancing the electromagnetic compatibility performance of components. For the features that do not meet the conditions, by adjusting the wiring harness layout, changing the wiring harness parameters and enhancing the components, the electromagnetic compatibility requirements can be met, thereby avoiding the electromagnetic compatibility risks.

[0012] Optionally, the simulation method further includes, when the simulation result does not meet the electromagnetic compatibility requirements, performing at least one of the following reverse optimization operations on the features that meet the conditions in the simulation model: changing the wiring harness layout to enhance the electromagnetic impact; changing the wiring harness parameters to enhance the electromagnetic environment; weakening the electromagnetic compatibility performance of components. For the features that meet the conditions, the wiring harness layout can be adjusted, the wiring harness parameters can be changed, and the components can be enhanced so that they are within the range of performance redundancy, allowing other features that do not meet the conditions to have greater adjustment space, while improving the optimization flexibility and avoiding performance redundancy caused by over-design.

[0013] An electric vehicle wire harness electromagnetic environment simulation system comprises: an acquisition module, used to acquire the working condition information of the electric vehicle, and determine the electromagnetic environment information, simulation tasks and simulation parameters of the electric vehicle wire harness according to the working condition information; a construction module, used to construct a simulation model according to the electromagnetic environment information of the wire harness; and a simulation solution module, used to perform simulation solution calculations on the simulation model according to the simulation parameters, simulation tasks and solution algorithms to obtain simulation results.

[0014] A device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute any of the above-mentioned methods for simulating the electromagnetic environment of an electric vehicle wiring harness.

[0015] A computer-readable storage medium stores a computer program, wherein the computer program is configured to execute any of the above-mentioned methods for simulating the electromagnetic environment of an electric vehicle wiring harness when running on a computer or a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 It is a flow chart of a method for simulating the electromagnetic environment of an electric vehicle wiring harness according to an embodiment of the present invention;

[0018] Figure 2A schematic diagram of a specific process of a method for simulating the electromagnetic environment of an electric vehicle wiring harness according to an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of an exemplary three-dimensional mechanical model in a method for simulating the electromagnetic environment of an electric vehicle wiring harness according to an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of an exemplary network model in a method for simulating the electromagnetic environment of an electric vehicle wiring harness according to an embodiment of the present invention;

[0021] Figure 5 It is a schematic diagram of an exemplary radiation emission electromagnetic field intensity in a method for simulating the electromagnetic environment of an electric vehicle wiring harness according to an embodiment of the present invention;

[0022] Figure 6 It is a schematic diagram of an exemplary coupled crosstalk noise in the electromagnetic environment simulation method of an electric vehicle wiring harness according to an embodiment of the present invention;

[0023] Figure 7 The structure diagram of the electromagnetic environment simulation system of the electric vehicle wiring harness according to the embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] According to an embodiment of the present invention, an embodiment of a method for simulating the electromagnetic environment of an electric vehicle wiring harness is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system containing at least one set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0027] The method embodiment can also be executed in an electronic system / device including a memory and a processor, a similar control system or a cloud. Taking an electronic system / device as an example, the electronic system / device may include one or more processors and a memory for storing data. Optionally, the above-mentioned electronic system / device may also include a communication device and a display device for communication functions. It can be understood by those of ordinary skill in the art that the above-mentioned structural description is only illustrative and does not limit the structure of the above-mentioned electronic system / device. For example, the electronic system / device may also include more or fewer components than the above-mentioned structural description, or have a configuration different from the above-mentioned structural description.

[0028] The processor may include one or more processing units. For example, the processor may include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microcontroller unit (MCU), a field-programmable gate array (FPGA), a neural network processor (NPU), a tensor processing unit (TPU), an artificial intelligence (AI) type processor, and the like. Among them, different processing units may be independent components or integrated into one or more processors. In some instances, the electronic system may also include one or more processors.

[0029] The memory can be used to store computer programs, such as storing the computer program corresponding to the vehicle control method in the embodiment of the present invention, and the processor implements the above-mentioned vehicle control method by running the computer program stored in the memory. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include a memory remotely arranged relative to the processor, and these remote memories can be connected to the electronic system via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0030] like Figure 1-2 As shown, a method for simulating the electromagnetic environment of an electric vehicle wiring harness comprises the following steps:

[0031] Step S100, obtaining the working condition information of the electric vehicle, and determining the electromagnetic environment information of the electric vehicle's wiring harness, simulation tasks and simulation parameters according to the working condition information.

[0032] Specifically, the operating condition information includes driving conditions, charging conditions, and external discharge conditions. The driving condition is the working mode in which the power battery provides power output to the electric drive and other high-voltage assemblies. The charging condition is that external charging equipment such as charging piles provide power output to the power battery. At this time, the electric drive assembly does not work, and other high-voltage assemblies have a certain working state. The external discharge condition is that the power battery provides power output to external electrical equipment. At this time, the electric drive assembly does not work, and other high-voltage assemblies have a certain working state. According to the expected simulation goal, it is clear which working condition is to be simulated and analyzed, that is, the corresponding working mode of the whole vehicle.

[0033] The electromagnetic environment information of the wiring harness includes interference sources, transmission paths and sensitive equipment. The working status of the other high-voltage assemblies mentioned above can be determined by specific working condition information and vehicle control strategy. After determining the working status of each component, the interference source, transmission path and sensitive equipment can be determined according to the working status of each component, and the simulation tasks and simulation parameters can be determined by referring to the control parameters of the working status of each component. The simulation tasks include boundary conditions, excitation sources, frequency bands, grid sizes, probes, electromagnetic field solution domains, etc. Simulation parameters include voltage parameters, current parameters, metal shell materials, wiring harness materials, wiring harness cross-sections, shielding layer information, etc.

[0034] Specifically, under driving conditions, according to the driving control strategy of the whole vehicle control strategy, the interference source in the electromagnetic environment information of the wire harness is determined to be the electronic equipment that may be used during the vehicle's driving process, and the transmission path is the relevant wire harness connected to these electronic devices. The simulation task is preliminarily set based on the electromagnetic environment of the wire harness that may appear during the vehicle's driving process. The dynamic parameters such as voltage parameters and current parameters in the simulation parameters need to be preliminarily determined based on the policies and control strategies during the vehicle's driving process.

[0035] Under charging conditions, according to the charging control strategy in the vehicle control strategy, the interference sources in the electromagnetic environment information of the wire harness are determined to be the electronic equipment that may be used in the charging process, the sensitive devices and the electronic equipment around the electronic equipment that may be affected, and the transmission path is the related wire harness connected to these electronic devices. The simulation task is preliminarily set based on the electromagnetic environment of the wire harness that appears during the charging process. The dynamic parameters such as voltage parameters and current parameters in the simulation parameters need to be preliminarily determined based on the policies and control strategies during the vehicle charging process.

[0036] Under the external discharge condition, according to the external power supply control strategy in the whole vehicle control strategy, the interference sources in the electromagnetic environment information of the wire harness are determined to be the electronic equipment that may be used in the external power supply process, the sensitive equipment and the electronic equipment around the electronic equipment that may be affected, and the transmission path is the related wire harness connected to these electronic devices. The simulation task is preliminarily set with the electromagnetic environment of the wire harness that appears in the external power supply process. The dynamic parameters such as voltage parameters and current parameters in the simulation parameters need to be preliminarily determined according to the policies and control strategies of the vehicle in the external power supply process.

[0037] Step S200, constructing a simulation model according to the electromagnetic environment information of the wire harness.

[0038] Specifically, according to the determined interference sources, transmission paths and sensitive equipment, the three-dimensional mechanical model of the corresponding parts can be established through modeling software such as CATIA, and the CAT format of the three-dimensional mechanical model can be imported into the EMA3D software. In the EMA3D software, interference sources such as the shell of high-voltage components and the shell of sensitive equipment can be extracted, and the center lines of the transmission paths, such as the center lines of the high-voltage wire harness and the disturbed wire harness, can be extracted, thereby forming a simulation model with less impact and easy to calculate.

[0039] Step S300, performing simulation solution calculation on the simulation model according to simulation parameters, simulation tasks and solution algorithms to obtain simulation results.

[0040] Specifically, the simulation model is meshed, and the EMA3D software is used to perform simulation and calculation based on the finite difference time domain algorithm and multi-conductor transmission line theory to obtain the simulation results. Among them, the simulation results include the radiation emission electromagnetic field intensity and coupled crosstalk noise. According to the radiation emission electromagnetic field intensity and coupled crosstalk noise, it can be determined whether the electromagnetic environment selected under the current working conditions has an unacceptable electromagnetic compatibility risk. It is not only used for the analysis of vehicle wiring harness crosstalk problems, but also includes the analysis of the radiation emission interference of the high-voltage wiring harness electromagnetic field to nearby sensitive equipment or controllers, to achieve the risk analysis of the radiation emission and coupled crosstalk problems of the whole vehicle or local wiring harness or the feasibility evaluation of the design scheme.

[0041] The present invention uses CATIA software to establish a three-dimensional mechanical model, uses EMA3D software to pre-process the three-dimensional mechanical model to obtain a simulation model, and uses a time-domain finite difference algorithm and a multi-conductor transmission line solution technology to perform simulation software calculations to obtain interference sources such as high-voltage wire harness external radiation electric field level and radiation magnetic field level, as well as noise on the disturbed wire harness through coupling crosstalk, which can effectively predict the risk of the design scheme, avoid electromagnetic compatibility risks in the design stage, reduce costs and shorten cycles, and assist in improving the electromagnetic compatibility performance of the entire vehicle. At the same time, the present invention realizes the study of external interference of high-voltage wire harnesses in a complex electromagnetic environment of the entire vehicle.

[0042] Optionally, the simulation method also includes step S400: obtaining the interference tolerance threshold of the device and the standard limit threshold of the disturbed wiring harness; when the maximum value of the radiated electromagnetic field intensity is lower than the interference tolerance threshold and the coupled crosstalk noise is lower than the standard limit threshold, determining that the simulation result meets the electromagnetic compatibility requirements; when the maximum value of the radiated electromagnetic field intensity is greater than or equal to the preset interference tolerance threshold or the maximum value of the coupled crosstalk noise is higher than or equal to the preset standard limit threshold, determining that the simulation result does not meet the electromagnetic compatibility requirements.

[0043] Specifically, when the electromagnetic field strength at the spatial position of the device exceeds the interference tolerance threshold, it is considered that the electromagnetic impact of the electromagnetic field on the device cannot be ignored. When the coupled crosstalk noise generated on the disturbed wiring harness and its connected electrical / electronic components is greater than the standard limit threshold, it is considered that the electromagnetic impact on the disturbed wiring harness and its connected electrical / electronic components cannot be ignored. If the maximum value of the radiated electromagnetic field strength in the simulation result is equal to or exceeds the interference tolerance threshold of the device, it is considered that there is an electromagnetic compatibility risk between the component corresponding to the radiated electromagnetic field strength and the sensitive device, and further optimization operations are required. If the maximum value of the coupled crosstalk noise in the simulation result is higher than or equal to the standard limit threshold of the disturbed wiring harness, it is considered that there is an electromagnetic compatibility risk between the component corresponding to the coupled crosstalk noise and the disturbed wiring harness, and further optimization operations are also required. In other embodiments, if the maximum value of the radiated electromagnetic field strength in the simulation result is equal to or exceeds eighty percent of the interference tolerance threshold, it is considered that there is an electromagnetic compatibility risk between the component corresponding to the radiated electromagnetic field strength and the sensitive device, and further optimization operations are required. If the maximum value of the coupled crosstalk noise in the simulation results is higher than or equal to eighty percent of the standard limit threshold, it is considered that there is an electromagnetic compatibility risk between the component corresponding to the coupled crosstalk noise and the disturbed wiring harness, and further optimization operations are required.

[0044] Optionally, the simulation method also includes step S500: when the simulation results do not meet the electromagnetic compatibility requirements, performing at least one of the following forward optimization operations on the features that do not meet the conditions in the simulation model: changing the wiring harness layout to weaken the electromagnetic impact; changing the wiring harness parameters to weaken the electromagnetic environment; enhancing the electromagnetic compatibility performance of components.

[0045] Specifically, changing the wiring harness layout to reduce the electromagnetic impact includes: increasing the distance between the high-voltage wiring harness and the low-voltage wiring harness, increasing the distance between the high-voltage wiring harness and the interfered components, preferably arranging the high-voltage wiring harness and the low-voltage wiring harness vertically and crosswise, preferably arranging the high-voltage power line and the ground line in parallel, etc. Changing the wiring harness parameters to reduce the electromagnetic environment includes: shortening the wiring harness length, increasing the number of twisted turns of the twisted pair, increasing the braiding density of the shielding layer, changing the shielding layer structure, etc. Enhancing the electromagnetic compatibility of components includes: reducing the noise of the interference source and increasing the anti-interference ability of the interfered equipment, effective grounding design, increasing the high and low voltage isolation design, increasing the interface filtering design, etc. That is, when the simulation results do not meet the expected threshold requirements, forward optimization design is performed to solve the problems of radiation emission and coupled crosstalk of the high-voltage wiring harness.

[0046] Optionally, the simulation method also includes step S600: when the simulation value does not meet the electromagnetic compatibility requirements, performing at least one of the following reverse optimization operations on the features that meet the conditions in the simulation model: changing the wiring harness layout to enhance the electromagnetic impact; changing the wiring harness parameters to enhance the electromagnetic environment; weakening the electromagnetic compatibility performance of components.

[0047] Specifically, changing the wiring harness layout to enhance the electromagnetic impact includes: reducing the distance between the high-voltage wiring harness and the low-voltage wiring harness, reducing the distance between the high-voltage wiring harness and the interfered components, sub-optimal vertical cross-arrangement of the high-voltage wiring harness and the low-voltage wiring harness, sub-optimal parallel arrangement of the high-voltage power line and the ground line, etc. Changing the wiring harness parameters to enhance the electromagnetic environment includes: appropriately increasing the wiring harness length, reducing the number of twisted turns of the twisted pair, reducing the braiding density of the shielding layer, changing the shielding layer structure, etc. Weakening the electromagnetic compatibility performance of components includes: reducing the interference requirements for the interference source equipment and the anti-interference ability of the interfered equipment within the performance redundancy range, reducing the number of groundings, canceling high and low voltage isolation measures, and reducing the interface filter level. That is, when the simulation value meets and exceeds the expected threshold requirements, reverse optimization design is performed to reduce the design priority, balance the electromagnetic compatibility performance and R&D design costs, and at the same time, provide a more ample optimization range for the optimization of other components that do not meet the simulation value.

[0048] The present invention can efficiently analyze the electromagnetic compatibility performance of high-voltage wire harnesses, avoid performance redundancy caused by over-design, identify design risks in advance, and solve electromagnetic compatibility problems of complex wire harnesses. In actual engineering applications, it can avoid problems that occur during testing and then need to be rectified, reduce repeated testing and rectification in the later stages of the project, reduce the development cost of the high-voltage system, and shorten the design cycle. At the same time, the present invention realizes the study of external interference of high-voltage wire harnesses in the complex electromagnetic environment of the entire vehicle.

[0049] For example, taking the analysis of the radiation emission and coupled crosstalk of the high-voltage wire harness during DC charging of an electric vehicle as an example, the simulation method includes:

[0050] Clarify the working conditions for simulation analysis, that is, the charging conditions. The high-voltage DC charging harness has voltage and current only when the vehicle is in charging mode, and the charging relay is in a disconnected state in other modes. Specifically, DC charging is the transmission of electrical energy from the DC charging pile to the battery assembly through the DC charging high-voltage wire harness in the high-voltage system. When determining the electromagnetic environment information of the wire harness, the interference signal is theoretically analyzed, that is, the interference source is the power device inside the DC charging pile, the switching device in the charging circuit, the noise of the common ground circuit, etc. The transmission path is the DC charging high-voltage wire harness, and the sensitive equipment is the low-voltage wire harness or electrical / electronic components near the DC charging high-voltage wire harness.

[0051] like Figure 3-4As shown, CATIA software is used to establish a three-dimensional mechanical model of DC charging high-voltage wire harness, charging seat, battery assembly, low-voltage wire harness, electrical / electronic components, etc. According to the vehicle control strategy, the low-voltage wire harness in this example selects the wheel speed sensor to the controller wheel and the battery assembly to the airbag controller as the disturbed wire harness, and the electrical / electronic component selects the wheel speed sensor as a typical example of sensitive equipment. The above-built three-dimensional mechanical model is saved in CAT format, imported into EMA3D software to extract the shell of high-voltage components and sensitive equipment, and the center line of the high-voltage wire harness and the disturbed wire harness is extracted. The center line is connected according to the wire harness path to form a simplified wire harness model as a simulation model. Define the materials such as metal shell, wire harness conductor, wire harness insulation layer, wire harness shielding layer, and set the simulation parameters such as wire harness section, form, and shielding layer. Set the solution area, signal source of the harness, simulation frequency band, mesh size, voltage and current probes, electromagnetic field solution domain, etc. In this example, the voltage and current probes are set near the beginning and end of the two low-voltage harnesses, respectively. The electromagnetic field solution domain is set to the location that includes the wheel speed sensor outline, and then the structural model is converted into a mesh model.

[0052] like Figure 5-6 As shown, EMA3D software is used to perform simulation and calculation based on the finite difference time domain algorithm and multi-conductor transmission line theory to obtain the electromagnetic field intensity radiated by the DC charging high-voltage wire harness at the spatial position of the wheel speed sensor and the noise of coupled crosstalk on the two low-voltage wire harnesses.

[0053] According to the simulation results, the maximum electromagnetic field intensity radiated by the DC charging high-voltage wire harness at the spatial position of the wheel speed sensor is 0.0109A / m, and the average electromagnetic field intensity is, which is much smaller than the interference signal value that the wheel speed sensor can tolerate, and will not have an electromagnetic compatibility impact on the electrical / electronic components; the maximum coupling crosstalk noise generated by the DC charging high-voltage wire harness to the beginning of the disturbed wire harness from the wheel speed sensor to the controller is 0.0064A, and the maximum coupling crosstalk noise generated by the terminal is 0.0017A; the maximum coupling crosstalk noise generated by the DC charging high-voltage wire harness to the beginning of the disturbed wire harness from the battery assembly to the airbag controller is 0.0021A, and the maximum coupling crosstalk noise generated by the terminal is 0.0025A, which is lower than the limit required by the standard, and will not affect the electromagnetic compatibility performance of the low-voltage wire harness and its connected electrical / electronic components. In summary, the design scheme of this embodiment is reasonable and has no electromagnetic compatibility risk.

[0054] The steps and details of the above examples may be adjusted according to actual conditions, and it cannot be considered that the specific embodiments of the present invention are limited thereto.

[0055] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art 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), including a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0056] In this embodiment, an electric vehicle wiring harness electromagnetic environment simulation system is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" is a combination of software and / or hardware that can implement a predetermined function. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0057] like Figure 7 As shown, an electromagnetic environment simulation system for electric vehicle wiring harness includes:

[0058] The acquisition module 11 is used to execute the above step S100: acquire the working condition information of the electric vehicle, and determine the electromagnetic environment information of the electric vehicle's wire harness, simulation tasks and simulation parameters according to the working condition information;

[0059] The construction module 12 is used to execute the above step S200: construct a simulation model according to the electromagnetic environment information of the wire harness;

[0060] The simulation solution module 13 is used to execute the above step S300: perform simulation solution calculation on the simulation model according to the simulation parameters, simulation tasks and solution algorithm to obtain simulation results.

[0061] Optionally, the simulation system also includes an optimization module 14, which is used to execute the above step S400: obtain the interference tolerance threshold of the device and the standard limit threshold of the disturbed wiring harness; when the maximum value of the radiated electromagnetic field intensity is lower than the interference tolerance threshold and the coupled crosstalk noise is lower than the standard limit threshold, determine that the simulation result meets the electromagnetic compatibility requirements; when the maximum value of the radiated electromagnetic field intensity is greater than or equal to the preset interference tolerance threshold or the maximum value of the coupled crosstalk noise is higher than or equal to the preset standard limit threshold, determine that the simulation result does not meet the electromagnetic compatibility requirements.

[0062] Optionally, the optimization module 14 is also used to execute the above step S500: when the simulation results do not meet the electromagnetic compatibility requirements, perform at least one of the following forward optimization operations on the features that do not meet the conditions in the simulation model: change the wiring harness layout to weaken the electromagnetic impact; change the wiring harness parameters to weaken the electromagnetic environment; enhance the electromagnetic compatibility performance of components.

[0063] Optionally, the optimization module 14 is also used to execute the above step S600: when the simulation value does not meet the electromagnetic compatibility requirements, perform at least one of the following reverse optimization operations on the features that meet the conditions in the simulation model: change the wiring harness layout to enhance the electromagnetic impact; change the wiring harness parameters to enhance the electromagnetic environment; weaken the electromagnetic compatibility performance of components.

[0064] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0065] An embodiment of the present invention further provides a device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute a method for simulating the electromagnetic environment of an electric vehicle wiring harness as described in any of the above embodiments.

[0066] Optionally, in this embodiment, the processor in the above device may be configured to run a computer program to execute the steps of the control method in the above embodiment:

[0067] Step S100: acquiring the working condition information of the electric vehicle, and determining the electromagnetic environment information of the electric vehicle's wiring harness, simulation tasks and simulation parameters according to the working condition information;

[0068] Step S200: constructing a simulation model according to the electromagnetic environment information of the wire harness;

[0069] Step S300: performing simulation calculation on the simulation model according to simulation parameters, simulation tasks and solution algorithms to obtain simulation results;

[0070] Step S400: Obtain the interference tolerance threshold of the device and the standard limit threshold of the disturbed wiring harness; when the maximum value of the radiated electromagnetic field intensity is lower than the interference tolerance threshold and the coupled crosstalk noise is lower than the standard limit threshold, determine that the simulation result meets the electromagnetic compatibility requirements; when the maximum value of the radiated electromagnetic field intensity is greater than or equal to the preset interference tolerance threshold or the maximum value of the coupled crosstalk noise is higher than or equal to the preset standard limit threshold, determine that the simulation result does not meet the electromagnetic compatibility requirements;

[0071] Step S500: When the simulation result does not meet the electromagnetic compatibility requirements, at least one of the following forward optimization operations is performed on the features in the simulation model that do not meet the conditions: changing the wiring harness layout to reduce the electromagnetic impact; changing the wiring harness parameters to reduce the electromagnetic environment; enhancing the electromagnetic compatibility performance of the components;

[0072] Step S600: When the simulation value does not meet the electromagnetic compatibility requirements, at least one of the following reverse optimization operations is performed on the features that meet the conditions in the simulation model: changing the wiring harness layout to enhance the electromagnetic impact; changing the wiring harness parameters to enhance the electromagnetic environment; weakening the electromagnetic compatibility performance of components.

[0073] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0074] An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute a method for simulating the electromagnetic environment of an electric vehicle wiring harness as described in any of the above embodiments when running on a computer or a processor.

[0075] Optionally, in this embodiment, the above-mentioned computer program may be configured to store a computer program for executing the steps of the control method in the above-mentioned embodiment:

[0076] Step S100: acquiring the working condition information of the electric vehicle, and determining the electromagnetic environment information of the electric vehicle's wiring harness, simulation tasks and simulation parameters according to the working condition information;

[0077] Step S200: constructing a simulation model according to the electromagnetic environment information of the wire harness;

[0078] Step S300: performing simulation calculation on the simulation model according to simulation parameters, simulation tasks and solution algorithms to obtain simulation results;

[0079] Step S400: Obtain the interference tolerance threshold of the device and the standard limit threshold of the disturbed wiring harness; when the maximum value of the radiated electromagnetic field intensity is lower than the interference tolerance threshold and the coupled crosstalk noise is lower than the standard limit threshold, determine that the simulation result meets the electromagnetic compatibility requirements; when the maximum value of the radiated electromagnetic field intensity is greater than or equal to the preset interference tolerance threshold or the maximum value of the coupled crosstalk noise is higher than or equal to the preset standard limit threshold, determine that the simulation result does not meet the electromagnetic compatibility requirements;

[0080] Step S500: When the simulation result does not meet the electromagnetic compatibility requirements, at least one of the following forward optimization operations is performed on the features in the simulation model that do not meet the conditions: changing the wiring harness layout to reduce the electromagnetic impact; changing the wiring harness parameters to reduce the electromagnetic environment; enhancing the electromagnetic compatibility performance of the components;

[0081] Step S600: When the simulation value does not meet the electromagnetic compatibility requirements, at least one of the following reverse optimization operations is performed on the features that meet the conditions in the simulation model: changing the wiring harness layout to enhance the electromagnetic impact; changing the wiring harness parameters to enhance the electromagnetic environment; weakening the electromagnetic compatibility performance of components.

[0082] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0083] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] In some embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the system embodiments described above are only schematic. For example, the division of the modules can be a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, modules or indirect coupling or communication connection of modules, which can be electrical or other forms.

[0085] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0086] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0087] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0088] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for simulating the electromagnetic environment of an electric vehicle wiring harness, characterized in that: include: Acquiring operating condition information of the electric vehicle, and determining electromagnetic environment information of a wiring harness of the electric vehicle, simulation tasks, and simulation parameters according to the operating condition information; Constructing a simulation model according to the electromagnetic environment information of the wire harness; The simulation model is simulated and solved according to the simulation parameters, the simulation task and the solution algorithm to obtain a simulation result.

2. According to claim 1, a method for simulating the electromagnetic environment of an electric vehicle wiring harness is characterized in that: The working condition information includes: Driving conditions, which are working modes in which the power battery provides electric energy output to the electric drive and other high-voltage assemblies; Charging condition, wherein the charging condition is a working mode in which an external charging device provides electric energy output to the power battery; External discharge working condition, the external discharge working condition is a working mode in which the power battery provides power output to external electrical equipment.

3. According to claim 2, a method for simulating the electromagnetic environment of an electric vehicle wiring harness is characterized in that: The determining of the electromagnetic environment information of the electric wire harness, the simulation task and the simulation parameters according to the working condition information includes: The electromagnetic environment information of the wiring harness, the simulation task and the simulation parameters are determined according to the operating condition information and the vehicle control strategy.

4. According to the method for simulating the electromagnetic environment of an electric vehicle wiring harness according to claim 3, it is characterized in that: The electromagnetic environment information of the electric wire harness includes interference sources, transmission paths and sensitive equipment, and constructing a simulation model according to the electromagnetic environment information of the electric wire harness includes: constructing a three-dimensional mechanical model according to the electromagnetic environment information of the wire harness; The interference source and the housing of the sensitive device are extracted according to the three-dimensional mechanical model, and the center line of the wire harness of the transmission path is extracted to obtain a simulation model.

5. According to the method for simulating the electromagnetic environment of an electric vehicle wiring harness according to claim 1, it is characterized in that: The simulation results include radiation emission electromagnetic field intensity and coupled crosstalk noise, and the simulation method further includes: Obtain the interference tolerance threshold of the equipment and the standard limit threshold of the disturbed wiring harness; When the maximum value of the radiated electromagnetic field intensity is lower than the interference tolerance threshold, and the maximum value of the coupled crosstalk noise is lower than the standard limit threshold, it is determined that the simulation result meets the electromagnetic compatibility requirement; When the maximum value of the radiated electromagnetic field intensity is greater than or equal to a preset interference tolerance threshold, or the maximum value of the coupled crosstalk noise is higher than or equal to a preset standard limit threshold, it is determined that the simulation result does not meet the electromagnetic compatibility requirement.

6. According to the method for simulating the electromagnetic environment of an electric vehicle wiring harness according to claim 5, it is characterized in that: The simulation method further includes, when the simulation result does not meet the electromagnetic compatibility requirement, performing at least one of the following forward optimization operations on the features in the simulation model that do not meet the conditions: Change the wiring harness layout to reduce electromagnetic influence; Change the wiring harness parameters to weaken the electromagnetic environment; Enhance the electromagnetic compatibility performance of components.

7. The method for simulating the electromagnetic environment of an electric vehicle wiring harness according to claim 5, characterized in that: The simulation method further includes, when the simulation result does not meet the electromagnetic compatibility requirement, performing at least one of the following reverse optimization operations on the features that meet the conditions in the simulation model: Changing the wiring harness layout increases the electromagnetic impact; Changing harness parameters to enhance the electromagnetic environment; Weaken the electromagnetic compatibility performance of components.

8. An electromagnetic environment simulation system for electric vehicle wiring harness, characterized in that: include: An acquisition module, used to: acquire the working condition information of the electric vehicle, and determine the electromagnetic environment information of the electric vehicle's wire harness, simulation tasks and simulation parameters according to the working condition information; A construction module is used to: construct a simulation model according to the electromagnetic environment information of the wire harness; The simulation solution module is used to perform simulation solution calculation on the simulation model according to the simulation parameters, simulation tasks and solution algorithm to obtain simulation results.

9. A device comprising a memory and a processor, characterized in that: The memory stores a computer program, and the processor is configured to run the computer program to execute the method for simulating the electromagnetic environment of an electric vehicle wiring harness as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, wherein the computer program is configured to execute the method for simulating the electromagnetic environment of an electric vehicle wiring harness as described in any one of claims 1 to 7 when running on a computer or a processor.

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