Whole vehicle electromagnetic determination method and system, vehicle and storage medium

Abstract

The invention discloses a whole vehicle electromagnetic determination method and system, a vehicle and a storage medium. The method comprises the steps that external low-frequency electromagnetic emission models of an electric drive system and a direct-current power source transformation system are built; based on the external low-frequency electromagnetic emission model, adding a whole vehicle model, performing field-circuit joint simulation, and determining a whole vehicle electromagnetic compatibility simulation model; based on the whole vehicle electromagnetic compatibility simulation model, space electromagnetic field simulation is carried out, and electromagnetic radiation data are determined. According to the embodiment of the invention, space electromagnetic field simulation is carried out through external low-frequency electromagnetic emission models of the electric drive system and the direct-current power supply conversion system in combination with the whole vehicle model. According to the embodiment of the invention, simulation modeling of a complex system can be realized, and improvement of the accuracy of an electromagnetic simulation result is facilitated. The method can be widely applied to the technical field of vehicle simulation.

Description

Technical Field

[0001] The present application relates to the field of vehicle simulation technology, and in particular to a whole-vehicle electromagnetic determination method and system, a vehicle and a storage medium. Background Art

[0002] New energy vehicles have many types of electronic devices, high power electrical equipment, complex electromagnetic environment of the whole vehicle, and serious electromagnetic radiation problems. The radiation emission of the whole new energy vehicle will affect other surrounding electronic equipment. In related technologies, the electromagnetic compatibility test scheme of the prototype vehicle is subject to the constraints of many factors, which affects the final electromagnetic compatibility effect. In addition, the electromagnetic prediction of electronic components in the design stage cannot achieve accurate electromagnetic prediction of the whole vehicle. Summary of the invention

[0003] The main purpose of the embodiments of the present application is to provide a high-accuracy whole-vehicle electromagnetic determination method and system, a vehicle and a storage medium.

[0004] To achieve the above-mentioned purpose, one aspect of an embodiment of the present application proposes a method for determining the electromagnetic compatibility of a whole vehicle, the method comprising: building an external low-frequency electromagnetic emission model of an electric drive system and a DC power conversion system; based on the external low-frequency electromagnetic emission model, adding a vehicle model to perform a field-road joint simulation to determine the electromagnetic compatibility simulation model of the whole vehicle; based on the electromagnetic compatibility simulation model of the whole vehicle, perform a space electromagnetic field simulation to determine the electromagnetic radiation data. The embodiment of the present application uses the external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system, combined with the vehicle model, to perform a space electromagnetic field simulation. The embodiment of the present application can realize simulation modeling of complex systems, which is conducive to improving the accuracy of electromagnetic simulation results.

[0005] In some embodiments, the method provided by the embodiments of the present application includes:

[0006] According to the full-wave simulation and electromagnetic field boundary conditions, determine the electromagnetic field distribution cloud map under the human body environment;

[0007] Based on the electromagnetic field distribution cloud map and the whole vehicle electromagnetic compatibility simulation model, an in-vehicle electromagnetic environment simulation model is established; the in-vehicle electromagnetic environment simulation model is used to determine the electromagnetic field distribution around the human body, the surface current distribution of the human body absorbing low-frequency magnetic fields, and the electromagnetic field human body specific absorption rate;

[0008] Based on the in-vehicle electromagnetic environment simulation model, the electromagnetic radiation distribution data of the entire vehicle to the human body is determined.

[0009] In some embodiments, the method provided in the embodiments of the present application, wherein the building of an external low-frequency electromagnetic emission model of an electric drive system and a DC power conversion system comprises:

[0010] Determine a first circuit of the electric drive system and a second circuit of the DC power conversion system;

[0011] According to the first circuit and the second circuit, an external low-frequency electromagnetic emission model is built using Simplier software.

[0012] In some embodiments, the method provided in the embodiments of the present application, based on the external low-frequency electromagnetic emission model, adding a vehicle model, performing field-road joint simulation, and determining the vehicle electromagnetic compatibility simulation model, includes:

[0013] Based on the external low-frequency electromagnetic emission model, a vehicle model is added, and a high- and low-voltage power cable coupling model inside the vehicle is built;

[0014] The field-road joint simulation is carried out through ANSYS software to determine the electromagnetic compatibility simulation model of the whole vehicle.

[0015] In some embodiments, the method provided by the embodiments of the present application includes:

[0016] Build the human body and antenna using FEM algorithm;

[0017] Build the car body through IE algorithm;

[0018] The electromagnetic environment inside the vehicle is established through the SBR+ algorithm.

[0019] In some embodiments, the method provided by the embodiments of the present application includes:

[0020] Modify the electromagnetic parameters of the human body according to the parts of the human body;

[0021] Based on the electromagnetic parameters and the in-vehicle electromagnetic environment simulation model, electromagnetic radiation distribution data at different parts of the human body are determined.

[0022] To achieve the above-mentioned purpose, another aspect of the embodiment of the present application provides a vehicle electromagnetic determination system, the system comprising:

[0023] The first module is used to build an external low-frequency electromagnetic emission model for the electric drive system and DC power conversion system;

[0024] The second module is used to add the vehicle model based on the external low-frequency electromagnetic emission model, perform field-road joint simulation, and determine the electromagnetic compatibility simulation model of the vehicle;

[0025] The third module is used to perform space electromagnetic field simulation based on the whole vehicle electromagnetic compatibility simulation model to determine electromagnetic radiation data.

[0026] To achieve the above objective, another aspect of an embodiment of the present application provides an electronic device, the electronic device comprising a memory and a processor, the memory storing a computer program, and the processor implementing the above method when executing the computer program.

[0027] To achieve the above-mentioned purpose, another aspect of an embodiment of the present application provides a vehicle, comprising the above-mentioned whole-vehicle electromagnetic determination system or the above-mentioned electronic device.

[0028] To achieve the above objective, another aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0029] The embodiments of the present application include at least the following beneficial effects: The method provided in the embodiments of the present application includes: building an external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system; based on the external low-frequency electromagnetic emission model, adding a vehicle model, performing field-road joint simulation, and determining the electromagnetic compatibility simulation model of the whole vehicle; based on the electromagnetic compatibility simulation model of the whole vehicle, performing space electromagnetic field simulation, and determining electromagnetic radiation data. The embodiments of the present application use the external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system, combined with the vehicle model, to perform space electromagnetic field simulation. The embodiments of the present application can realize simulation modeling of complex systems, which is conducive to improving the accuracy of electromagnetic simulation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of an embodiment of the vehicle electromagnetic determination method provided by the present application;

[0031] Figure 2 is a schematic diagram of an embodiment of the in-vehicle electromagnetic environment simulation model provided by the present application;

[0032] Figure 3 is a schematic diagram of another embodiment of the in-vehicle electromagnetic environment simulation model provided by the present application;

[0033] Figure 4 is an electrical schematic diagram of an embodiment of the first circuit provided by the present application;

[0034] Figure 5 This is a schematic diagram of an embodiment of the magnetic field distribution in a vehicle at the human chest position provided by the present application;

[0035] Figure 6 It is a schematic diagram of an embodiment of measuring the magnetic field in a vehicle at the human chest position provided by the present application;

[0036] Figure 7 It is a comparison diagram between the simulation and experiment of the magnetic flux density of the main driving position in the startup state provided by this application;

[0037] Figure 8 It is a comparison diagram between the simulation and experiment of the magnetic flux density at the co-pilot position in the startup state provided by this application;

[0038] Fig. 9 It is a comparison diagram between the simulation and experiment of the magnetic flux density at the rear seat position in the startup state provided by the present application;

[0039] Fig.10 It is a structural schematic diagram of the vehicle electromagnetic determination system provided in an embodiment of the present application;

[0040] Fig.11 It is a schematic diagram of the hardware structure of an electronic device in a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the attached claims.

[0042] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0043] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0045] New energy vehicles have many types of electronic devices, high power electrical equipment, complex electromagnetic environment of the whole vehicle, and serious electromagnetic radiation problems. The radiation emission of new energy vehicles will affect other surrounding electronic equipment. Study the radiation characteristics and sensitivity characteristics of new energy vehicles, and collect electromagnetic environment data inside the vehicle and in various working conditions in a targeted manner. The embodiment of this application focuses on the simulation modeling method of complex systems, proposes an electromagnetic calculation method for multi-scale complex systems, and solves the problem of modeling and calculation of complex systems. A simulation model of electromagnetic compatibility of an electric vehicle is built based on the simulation analysis of the electric drive system, cable shielding effectiveness, and vehicle-mounted antenna performance.

[0046] The electromagnetic determination method of the whole vehicle provided in the embodiment of the present application relates to the field of vehicle simulation technology. The electromagnetic determination method of the whole vehicle provided in the embodiment of the present application can be applied to a terminal, can also be applied to a server, and can also be software running in a terminal or a server. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, a smart speaker, a smart watch, and a vehicle-mounted terminal, etc., but is not limited to this; the server side can be configured as an independent physical server, or it can be configured as a server cluster or distributed system composed of multiple physical servers, and can also be configured as 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 platforms. The server can also be a node server in a blockchain network; the software can be an application that implements the electromagnetic determination method of the whole vehicle, etc., but is not limited to the above forms.

[0047] The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments, in which tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0048] It should be noted that in each specific implementation of the present application, when it comes to the need to perform relevant processing based on data related to user identity or characteristics such as user information, user behavior data, user historical data, and user location information, the user's permission or consent will be obtained first, and the collection, use, and processing of these data will comply with relevant laws, regulations, and standards. In addition, when the embodiment of the present application needs to obtain the user's sensitive personal information, the user's separate permission or consent will be obtained through a pop-up window or by jumping to a confirmation page. After clearly obtaining the user's separate permission or consent, the necessary user-related data for the normal operation of the embodiment of the present application will be obtained.

[0049] Figure 1 This is an optional flow chart of the vehicle electromagnetic determination method provided in the embodiment of the present application; Figure 1 The method may include but is not limited to steps S100 to S300.

[0050] Step S100, building an external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system;

[0051] Step S200, based on the external low-frequency electromagnetic emission model, adding the vehicle model, performing field-road joint simulation, and determining the vehicle electromagnetic compatibility simulation model;

[0052] Step S300, based on the electromagnetic compatibility simulation model of the whole vehicle, a spatial electromagnetic field simulation is performed to determine electromagnetic radiation data.

[0053] The embodiment of the present application determines the external low-frequency electromagnetic emission model by building an electric drive system and a DC power conversion system. It can be understood that for new energy vehicles, the electric drive system mainly relies on electric energy to achieve vehicle movement. Figure 2 and Figure 3 As shown, the electric drive system that this application focuses on is mainly the route where the battery pack / power supply transmits electrical energy to the motor through DC / AC conversion. The DC power conversion system mainly uses the battery pack / power supply to transmit electrical energy to the storage battery / electrical equipment through DC / DC conversion. After building the external low-frequency electromagnetic emission model, combined with the vehicle model, a field-road joint simulation is performed to determine the electromagnetic compatibility simulation model of the whole vehicle. The electromagnetic radiation of the vehicle is simulated and calculated through the electromagnetic compatibility simulation model of the whole vehicle.

[0054] The improved method of the embodiment of the present application includes: building an external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system; based on the external low-frequency electromagnetic emission model, adding the vehicle model, performing field-road joint simulation, and determining the electromagnetic compatibility simulation model of the whole vehicle; based on the electromagnetic compatibility simulation model of the whole vehicle, performing space electromagnetic field simulation and determining electromagnetic radiation data. The embodiment of the present application uses the external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system, combined with the vehicle model, to perform space electromagnetic field simulation. The embodiment of the present application can realize simulation modeling of complex systems, which is conducive to improving the accuracy of electromagnetic simulation results.

[0055] In some embodiments, the method provided by the embodiments of the present application includes:

[0056] According to the full-wave simulation and electromagnetic field boundary conditions, determine the electromagnetic field distribution cloud map under the human body environment;

[0057] Based on the electromagnetic field distribution cloud map and the vehicle electromagnetic compatibility simulation model, the in-vehicle electromagnetic environment simulation model is established; the in-vehicle electromagnetic environment simulation model is used to determine the electromagnetic field distribution around the human body, the surface current distribution of the human body absorbing low-frequency magnetic fields, and the electromagnetic field human body specific absorption rate;

[0058] Based on the in-vehicle electromagnetic environment simulation model, the electromagnetic radiation distribution data of the entire vehicle to the human body is determined.

[0059] In some possible implementations, full-wave simulation of the electromagnetic field distribution of the vehicle body requires the establishment of an accurate vehicle model. Specifically, there may be components such as the vehicle body structure, electronic equipment, and cables. It is also necessary to determine relevant material properties, such as the electrical conductivity and magnetic permeability of the vehicle body metal. It is also necessary to set an excitation source, which may include an external electromagnetic field source. For example, there are various types of electromagnetic radiation from other vehicles, communication base stations, high-voltage lines, etc. It is also necessary to consider the relevant physical phenomena of electromagnetic waves, such as reflection, refraction, scattering, and absorption of electromagnetic waves. Of course, the above examples are conventional processes, and those skilled in the art can set the processing process and parameters of the full-wave simulation according to actual needs, and this application does not impose specific restrictions.

[0060] It is understandable that when performing full-wave simulation of the electromagnetic field distribution of the vehicle body, it is also crucial to reasonably set the electromagnetic field boundary conditions. Specifically, they include the following:

[0061] Ideal conductor boundary conditions: Assume that the vehicle is a perfect conductor, the tangential component of the electric field on its surface is zero, and the normal component of the magnetic field is zero.

[0062] Radiation boundary condition: It is used to simulate electromagnetic wave radiation in open space, and the boundary is regarded as a radiation wave propagating outward.

[0063] Symmetric boundary conditions: used for vehicles with symmetrical body structures, the amount of calculation is reduced by using symmetric boundary conditions. Specifically, for the symmetric plane, the tangential component of the electric field or the tangential component of the magnetic field is zero.

[0064] Perfectly Matched Layer Boundary Condition (PML): A hypothetical anisotropic lossy medium boundary condition used to absorb outgoing electromagnetic waves in numerical simulations.

[0065] In a specific embodiment, those skilled in the art need to select appropriate boundary conditions based on specific simulation problems and specific vehicle models. For example, if the focus is on the electromagnetic field distribution inside the vehicle body, and the influence of the external environment of the vehicle body on the electromagnetic field is small, an ideal conductor boundary condition can be selected. If the electromagnetic radiation of the vehicle body to the surrounding space needs to be considered, a radiation boundary condition or a matching layer boundary condition can be selected. Through full-wave simulation and the setting of boundary conditions, the electromagnetic field strength, electric field distribution, magnetic field distribution, etc. at various positions inside and outside the vehicle body can be obtained.

[0066] In some embodiments, the method provided in the embodiments of the present application builds an external low-frequency electromagnetic emission model of an electric drive system and a DC power conversion system, including:

[0067] Determine a first circuit of the electric drive system and a second circuit of the DC power conversion system;

[0068] According to the first circuit and the second circuit, an external low-frequency electromagnetic emission model is built using the Simplier software.

[0069] In some possible implementations, the first circuit and the second circuit are circuit models of a specific vehicle model, and the present application does not limit the specific electrical schematic diagram of the circuit model. Figure 4As shown, it is a DCDC system circuit model in a specific embodiment, and the corresponding model is built by the circuit model. In some embodiments, the model can be built by Simplier software. ANSYS Simplier is a powerful multi-domain system simulation software module that can realize the modeling, simulation and analysis of complex systems such as electrical, electronic, electromagnetic, control, power electronics and electromechanical systems. A powerful component library is provided: a rich predefined component and model are provided, including electrical components, semiconductor devices, motors, sensors, etc., which is convenient for users to quickly build a system. The software / module can realize collaborative simulation, specifically, it can be collaboratively simulated with other software under ANSYS (such as Maxwell, HFSS, etc.) to realize the joint analysis of multiple physical fields such as electromagnetic-circuit, thermal-circuit, etc. At the same time, it also supports the modeling and simulation of multiple control strategies, which is convenient for users to design and optimize control systems. The embodiment of the present application uses ANSYS Simplier simulation software to build a simulation circuit model, realizing the model simulation design of complex systems.

[0070] In some embodiments, the method provided in the embodiments of the present application is based on the external low-frequency electromagnetic emission model, adds the vehicle model, performs field-road joint simulation, and determines the electromagnetic compatibility simulation model of the vehicle, including:

[0071] Based on the external low-frequency electromagnetic emission model, the vehicle model is added, and the high and low voltage power cable coupling model inside the vehicle is built;

[0072] The field-road joint simulation is carried out through ANSYS software to determine the electromagnetic compatibility simulation model of the whole vehicle.

[0073] In some possible implementations, field-circuit joint simulation is a simulation method that combines electromagnetic field analysis with circuit analysis. In actual electrical systems, the distribution of the electromagnetic field of the circuit interacts with each other; and field-circuit joint simulation aims to more accurately describe and analyze this interaction. Exemplarily, the electromagnetic field distribution inside the device / object affects the performance of the device / object, and the current and voltage in the circuit determine the excitation of the electromagnetic field. Through field-circuit joint simulation, the electromagnetic field model inside the device / object can be combined with the external circuit model. Usually, when implementing field-circuit joint simulation, dedicated simulation software is used, such as Maxwell software in ANSYS for electromagnetic field analysis and Simplier software for circuit analysis. Conventionally, an electromagnetic field model is first established in the electromagnetic field analysis software, and relevant electromagnetic parameters such as inductance and resistance are calculated. Then these parameters are passed to the circuit analysis software, a circuit model is constructed, and a simulation analysis of the circuit is performed. At the same time, information such as the current and voltage in the circuit will also be fed back to the electromagnetic field model to achieve interaction and collaborative calculation between the two. Of course, those skilled in the art can adjust the field-circuit joint simulation process according to actual needs, and this application does not make specific limitations.

[0074] In some embodiments, the method provided by the embodiments of the present application includes:

[0075] Build the human body and antenna using FEM algorithm;

[0076] Build the car body through IE algorithm;

[0077] The electromagnetic environment inside the vehicle is established through the SBR+ algorithm.

[0078] Among some possible implementations, the finite element method (FEM) is a commonly used numerical algorithm for electromagnetic simulation. FEM divides the solution area into many small units, and by approximating the electromagnetic field in each unit, a set of algebraic equations is established to describe the electromagnetic field distribution in the entire solution area. The specific process of this method is as follows:

[0079] Step S21, problem modeling, building a model based on the geometric shape, material properties, and boundary conditions of the solution area.

[0080] Step S22: meshing, discretizing the solution area into a finite number of units.

[0081] Step S23, interpolation function selection, selecting a suitable interpolation function in each unit to approximately represent the electromagnetic field.

[0082] Step S24, establishing equations, based on Maxwell's equations and variational principles, establishing algebraic equations about unknown quantities.

[0083] Step S25, solving equations, solving the established equation group by numerical methods to obtain a numerical solution of the electromagnetic field.

[0084] The FEM algorithm has high accuracy and flexibility in dealing with electromagnetic calculations of complex geometries and inhomogeneous media.

[0085] The IE algorithm is the integral equation algorithm. It is based on the integral form of Maxwell's equations and uses Green's function to automatically meet the radiation boundary conditions. Compared with the FEM algorithm, the IE algorithm does not require the definition of radiation boundary conditions. When dealing with electrically large-scale and open-structure problems, the IE algorithm can solve them efficiently. At the same time, it also supports adaptive mesh technology and can solve related problems with high precision.

[0086] The SBR+ algorithm is an improved Shooting and Bouncing Ray+, which is a high-frequency algorithm for electromagnetic simulation of electrically large-scale scenes. The embodiment of the present application uses different algorithms to build different simulation objects, which greatly improves the prediction accuracy of the model.

[0087] In some embodiments, the method provided by the embodiments of the present application includes:

[0088] Modify the electromagnetic parameters of the human body according to the parts of the human body;

[0089] Based on electromagnetic parameters and the in-vehicle electromagnetic environment simulation model, the electromagnetic radiation distribution data at different parts of the human body are determined.

[0090] The embodiment of the present application refers to the sitting human body size and human horizontal size ratio with a percentile value of 50 in the relevant standards to establish a human body sitting model in the electric vehicle compartment. At the same time, corresponding electromagnetic parameters are set for different parts of the human body. Exemplarily, for the electromagnetic parameters of the head model, the numerical average values ​​of the electrical conductivity and relative dielectric constant of three tissues, cerebrospinal fluid, white matter and gray matter, are selected; for the electromagnetic parameters of the torso model, the numerical average values ​​of the electrical conductivity and relative dielectric constant of four tissues, muscle, fat, bone and blood, are selected. In some embodiments, the electromagnetic parameters of each part can also be determined based on weights.

[0091] The following is a detailed description and explanation of the solution of the embodiment of the present invention in conjunction with a specific application example:

[0092] The embodiment of the present application predicts and analyzes the low-frequency electromagnetic emission of the whole vehicle by establishing a simulation model of the coupling of the electric drive system and the whole vehicle. Exemplarily, the external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system is built by Simplier software; the electric vehicle model is added, the high and low voltage power cable coupling model in the car is built, and the field-road joint simulation is performed using ANSYS software to build the electromagnetic compatibility simulation model of the whole electric vehicle. A hybrid algorithm is used to ensure the balance between efficiency and accuracy, wherein the human body and antenna use the FEM algorithm, the car body uses the IE algorithm, and the electromagnetic environment in the car uses the SBR+ algorithm. Based on full-wave simulation and electromagnetic field boundary conditions, the electromagnetic field distribution cloud map under the human / car body environment is obtained, and the electromagnetic field distribution around the human body, the surface current distribution of the human body absorbing the low-frequency magnetic field, and the electromagnetic field human body specific absorption rate simulation model are established. A simulation model of the electromagnetic environment in the car under the condition of the human body is built, which mainly analyzes the impact of the low-frequency magnetic field emission generated by the power line in the car on the in-car environment, which is a very critical simulation prediction and research.

[0093] The embodiment of the present application establishes a vehicle-level electromagnetic compatibility simulation model to analyze the electromagnetic environment in the vehicle under load conditions, and establishes a human body model to analyze the factors that affect the electromagnetic exposure of the human body in the vehicle.

[0094] First, build the external low-frequency electromagnetic emission model of the electric drive system and DC power conversion system;

[0095] Then, ANSYS simulation software is used to carry out field-road joint simulation, build a vehicle-level electromagnetic compatibility simulation model for electric vehicles, conduct spatial electromagnetic field simulation under dynamic operating conditions of the vehicle, and study the dynamic distribution characteristics of the vehicle body conduction current.

[0096] Reference Figure 5 As shown, a vehicle model is simulated by the vehicle electromagnetic determination method provided in the embodiment of the present application, and a magnetic field distribution diagram of the human chest position in the vehicle is obtained. Then, by Figure 6 The device shown was measured at the same location and compared with Figure 5 The obtained results are compared and analyzed. In other embodiments, the electromagnetic environment data of a certain model of FAW Hongqi automobile under static, starting and driving conditions are obtained through experimental testing and compared with the simulation results. The magnetic flux density measured at the main driver, co-driver and rear seat positions of a certain pure electric vehicle in the starting state is selected and compared with the software simulation results. Figure 7 The simulation and experimental comparison of the magnetic flux density at the main driving position in the startup state is shown in the figure, where the horizontal axis is the frequency and the vertical axis is the amplitude. Figure 8 This is a comparison chart between the simulation and experiment of the magnetic flux density at the co-pilot position in the startup state; Fig. 9This is a comparison chart of the magnetic flux density simulation and experiment at the rear seat position in the startup state. The comparison results show that the simulation results are infinitely close to the test results, and the difference between the simulation results and the experimental results is less than one order of magnitude, about 3dB. The established vehicle-level electromagnetic compatibility simulation model has practical reference value.

[0097] In addition, the electromagnetic field in the vehicle interior was studied, and the simulation results met the limits defined in GB / T 37130-2018. Comparing the simulation results of the magnetic flux density in the vehicle under the startup state with the experimental results, the average error between the simulation results and the test results did not exceed 0.1μT, and the maximum error did not exceed 0.241μT, proving the correctness of the simulation model.

[0098] See also Fig.10 The embodiment of the present application also provides a whole vehicle electromagnetic determination system, which can implement the above-mentioned whole vehicle electromagnetic determination method, and the system includes:

[0099] The first module 810 is used to build an external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system;

[0100] The second module 820 is used to perform field-road joint simulation based on the external low-frequency electromagnetic emission model and add the vehicle model to determine the electromagnetic compatibility simulation model of the vehicle;

[0101] The third module 830 is used to perform space electromagnetic field simulation based on the electromagnetic compatibility simulation model of the whole vehicle and determine the electromagnetic radiation data.

[0102] In some embodiments, the system provided by the embodiments of the present application further includes a fourth module for determining an electromagnetic field distribution cloud map under a human body environment based on full-wave simulation and electromagnetic field boundary conditions;

[0103] Based on the electromagnetic field distribution cloud map and the vehicle electromagnetic compatibility simulation model, the in-vehicle electromagnetic environment simulation model is established; the in-vehicle electromagnetic environment simulation model is used to determine the electromagnetic field distribution around the human body, the surface current distribution of the human body absorbing low-frequency magnetic fields, and the electromagnetic field human body specific absorption rate;

[0104] Based on the in-vehicle electromagnetic environment simulation model, the electromagnetic radiation distribution data of the entire vehicle to the human body is determined.

[0105] In some embodiments, the first module in the system provided by the embodiments of the present application is used to determine a first circuit of the electric drive system and a second circuit of the DC power conversion system;

[0106] According to the first circuit and the second circuit, an external low-frequency electromagnetic emission model is built using the Simplier software.

[0107] In some embodiments, the second module in the system provided in the embodiments of the present application is used to add a vehicle model based on the external low-frequency electromagnetic emission model, and build a high and low voltage power cable coupling model in the vehicle;

[0108] The field-road joint simulation is carried out through ANSYS software to determine the electromagnetic compatibility simulation model of the whole vehicle.

[0109] In some embodiments, the system provided by the embodiments of the present application further includes a fifth module for constructing a human body and an antenna by using a FEM algorithm;

[0110] Build the car body through IE algorithm;

[0111] The electromagnetic environment inside the vehicle is established through the SBR+ algorithm.

[0112] In some embodiments, the system provided by the embodiments of the present application further includes a fourth module for modifying the electromagnetic parameters of the human body according to the part of the human body;

[0113] Based on electromagnetic parameters and the in-vehicle electromagnetic environment simulation model, the electromagnetic radiation distribution data at different parts of the human body are determined.

[0114] It can be understood that the contents of the above method embodiments are all applicable to the present system embodiments, the functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0115] The embodiment of the present application also provides an electronic device, the electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the above vehicle electromagnetic determination method when executing the computer program. The electronic device can be any intelligent terminal including a tablet computer, a vehicle-mounted computer, etc.

[0116] It can be understood that the contents of the above method embodiments are all applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0117] The present application also provides a vehicle, comprising the above-mentioned whole-vehicle electromagnetic determination system or the above-mentioned electronic device.

[0118] It can be understood that the contents of the above method embodiments are all applicable to the present vehicle embodiment, the functions specifically implemented by the present vehicle embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0119] The embodiment of the present application also provides a vehicle, which includes the above-mentioned vehicle electromagnetic determination system or the electric drive assembly of the computer device. Specifically, the vehicle can be a private car, such as a sedan, SUV, MPV or pickup truck. The vehicle can also be an operating vehicle, such as a van, bus, small truck or large trailer. The vehicle can be a gasoline vehicle or a new energy vehicle. When the vehicle is a new energy vehicle, it can be a hybrid vehicle or a pure electric vehicle.

[0120] See also Fig.11 , Fig.11 The hardware structure of an electronic device of another embodiment is illustrated, and the electronic device includes:

[0121] The processor 901 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0122] The memory 902 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 902 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 902, and the processor 901 calls and executes the vehicle electromagnetic determination method of the embodiment of this application;

[0123] Input / output interface 903, used to implement information input and output;

[0124] Communication interface 904, used to realize communication interaction between the device and other devices, which can be realized through wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WI FI, Bluetooth, etc.);

[0125] A bus 905 that transmits information between various components of the device (e.g., the processor 901, the memory 902, the input / output interface 903, and the communication interface 904);

[0126] The processor 901 , the memory 902 , the input / output interface 903 and the communication interface 904 are connected to each other in communication within the device via a bus 905 .

[0127] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned vehicle electromagnetic determination method is implemented.

[0128] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiments, the functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0129] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor 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.

[0130] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0131] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0132] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0134] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application 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 data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0135] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0136] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units 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, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] The units described above 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 on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0138] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0139] If the integrated unit is implemented in the form of a software functional unit 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 application is essentially 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 multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store programs.

[0140] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A vehicle electromagnetic determination method, It is characterized in that The method comprises: Build an external low-frequency electromagnetic emission model for the electric drive system and DC power conversion system; Based on the external low-frequency electromagnetic emission model, a vehicle model is added to perform field-road joint simulation to determine the electromagnetic compatibility simulation model of the vehicle; Based on the whole vehicle electromagnetic compatibility simulation model, a spatial electromagnetic field simulation is performed to determine the electromagnetic radiation data.

2. The method according to claim 1, It is characterized in that The method further comprises: According to the full-wave simulation and electromagnetic field boundary conditions, determine the electromagnetic field distribution cloud map under the human body environment; Based on the electromagnetic field distribution cloud map and the whole vehicle electromagnetic compatibility simulation model, an in-vehicle electromagnetic environment simulation model is established; the in-vehicle electromagnetic environment simulation model is used to determine the electromagnetic field distribution around the human body, the surface current distribution of the human body absorbing low-frequency magnetic fields, and the electromagnetic field human body specific absorption rate; Based on the in-vehicle electromagnetic environment simulation model, the electromagnetic radiation distribution data of the entire vehicle to the human body is determined.

3. The method according to claim 1, It is characterized in that The construction of the external low-frequency electromagnetic emission model of the electric drive system and the DC power conversion system includes: Determine a first circuit of the electric drive system and a second circuit of the DC power conversion system; According to the first circuit and the second circuit, an external low-frequency electromagnetic emission model is built using Simplorer software.

4. The method according to claim 1, It is characterized in that The method of adding a vehicle model based on the external low-frequency electromagnetic emission model to perform field-road joint simulation to determine the vehicle electromagnetic compatibility simulation model includes: Based on the external low-frequency electromagnetic emission model, a vehicle model is added, and a high- and low-voltage power cable coupling model inside the vehicle is built; The field-road joint simulation is carried out through ANSYS software to determine the electromagnetic compatibility simulation model of the whole vehicle.

5. The method according to claim 1, It is characterized in that The method further comprises: Build the human body and antenna using FEM algorithm; Build the car body through IE algorithm; The electromagnetic environment inside the vehicle is established through the SBR+ algorithm.

6. The method according to claim 2, It is characterized in that The method further comprises: Modify the electromagnetic parameters of the human body according to the body parts; Based on the electromagnetic parameters and the in-vehicle electromagnetic environment simulation model, electromagnetic radiation distribution data at different parts of the human body are determined.

7. A vehicle electromagnetic determination system, It is characterized in that The system comprises: The first module is used to build an external low-frequency electromagnetic emission model for the electric drive system and DC power conversion system; The second module is used to add the vehicle model based on the external low-frequency electromagnetic emission model, perform field-road joint simulation, and determine the electromagnetic compatibility simulation model of the vehicle; The third module is used to perform space electromagnetic field simulation based on the whole vehicle electromagnetic compatibility simulation model to determine electromagnetic radiation data.

8. An electronic device, It is characterized in that The electronic device comprises a memory and a processor, the memory stores a computer program, and the processor implements the method according to any one of claims 1 to 6 when executing the computer program.

9. A vehicle, It is characterized in that The vehicle includes the whole-vehicle electromagnetic determination system as described in claim 7 or the electronic device as described in claim 8.

10. A computer-readable storage medium storing a computer program. It is characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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