Simulation method and device for radiation emission result, vehicle and storage medium

Abstract

The application discloses a kind of radiation emission result simulation method, device, vehicle and storage medium.The method includes: obtaining the equivalent circuit of motor controller, wherein the structure of equivalent circuit matches the structure of motor controller;Information simulation is carried out to equivalent circuit, and the time domain signal of motor controller is obtained;Determine the first radiation emission result of motor controller under the condition of non-shielded wire based on time domain signal;Determine the target attenuation factor matched with the first radiation emission result, wherein the target attenuation factor is used to characterize the suppression degree of shielded wire to the radiation emission result of motor controller;Determine the second radiation emission result corresponding to target attenuation factor, wherein the second radiation emission result is used to characterize the radiation emission intensity of motor controller under the condition of shielded wire.The application solves the technical problem that the accuracy of analog radiation simulation result under the condition of shielded wire is low.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more specifically, to a method, apparatus, vehicle, and storage medium for simulating radiation emission results. Background Technology

[0002] Currently, with the rapid development of new energy vehicles, although they are more energy-efficient and environmentally friendly than traditional vehicles, they face challenges such as electromagnetic compatibility. As an on-board component, the motor controller system is gradually developing towards miniaturization and high efficiency, but it generates large amounts of electromagnetic interference with a wide bandwidth, making it a major source of interference for new energy vehicles.

[0003] Electromagnetic interference is divided into conducted emission and radiated emission. The simulation results of electromagnetic interference cannot be effectively compared with the actual test results, resulting in the problem of low accuracy of radiation simulation results under the condition of simulating shielded wires.

[0004] There is currently no effective solution to the problem of low accuracy in radiation simulation results under the above-mentioned simulated shielded wire conditions. Summary of the Invention

[0005] This invention provides a method, apparatus, vehicle, and storage medium for simulating radiated emission results, to at least address the technical problem of low accuracy in radiated emission simulation results under simulated shielded wire conditions.

[0006] According to one aspect of the present invention, a simulation method for radiated emission results is provided. The method may include: obtaining an equivalent circuit of a motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller; performing information simulation on the equivalent circuit to obtain a time-domain signal of the motor controller; determining a first radiated emission result of the motor controller under unshielded conditions based on the time-domain signal, wherein the first radiated emission result characterizes the radiated emission intensity of the motor controller under unshielded conditions; determining a target attenuation factor matching the first radiated emission result, wherein the target attenuation factor characterizes the degree of suppression of the radiated emission result of the motor controller by the shielding wire; and determining a second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result characterizes the radiated emission intensity of the motor controller under shielded conditions.

[0007] Optionally, determining a target attenuation factor that matches the first radiated emission result includes: performing radiated emission simulation on the motor controller to obtain a first radiated emission result of the motor controller under unshielded conditions and a third radiated emission result under shielded conditions, wherein the third radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded conditions in the test simulation circuit; and determining the target attenuation factor based on the first radiated emission result and the third radiated emission result.

[0008] Optionally, determining the target attenuation factor based on the first radiative emission result and the third radiative emission result includes: determining the difference between the first radiative emission result and the third radiative emission result as the attenuation factor; and determining the target attenuation factor based on the attenuation factor.

[0009] Optionally, determining the target attenuation factor based on the attenuation factor includes: determining the shielding characteristics of the motor controller; and fitting the attenuation factor based on the shielding characteristics to obtain the target attenuation factor.

[0010] Optionally, the attenuation factor is fitted based on the characteristics of the shielding wire to obtain the target attenuation factor, including: in response to the characteristics of the shielding wire being aluminum foil shielding wire, the attenuation factor is linearly fitted to obtain the target attenuation factor.

[0011] Optionally, the attenuation factor is fitted based on the characteristics of the shielding wire to obtain the target attenuation factor, including: in response to the characteristics of the shielding wire being a braided shielding wire, the attenuation factor is logarithmically fitted to obtain the target attenuation factor.

[0012] Optionally, determining the second radiative emission result corresponding to the target attenuation factor includes: determining the second radiative emission result as the sum of the target attenuation factor and the first radiative emission result.

[0013] According to another aspect of the present invention, a simulation apparatus for radiated emission results is also provided. The apparatus may include: an acquisition unit for acquiring an equivalent circuit of a motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller; a simulation unit for performing information simulation on the equivalent circuit to obtain a time-domain signal of the motor controller; a first determination unit for determining a first radiated emission result of the motor controller under unshielded conditions based on the time-domain signal, wherein the first radiated emission result characterizes the radiated emission intensity of the motor controller under unshielded conditions; a second determination unit for determining a target attenuation factor matching the first radiated emission result, wherein the target attenuation factor characterizes the degree of suppression of the radiated emission result of the motor controller by the shielding wire; and a third determination unit for determining a second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result characterizes the radiated emission intensity of the motor controller under shielded conditions.

[0014] According to another aspect of the present invention, a vehicle is also provided. This vehicle is used to perform a simulation method for the radiated emission results of the embodiments of the present invention.

[0015] According to another aspect of the present invention, a computer-readable storage medium is also provided. The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform a simulation method for radiated emission results according to the embodiments of the present invention.

[0016] In this embodiment of the invention, an equivalent circuit of the motor controller is obtained, wherein the structure of the equivalent circuit matches the structure of the motor controller; information simulation is performed on the equivalent circuit to obtain the time-domain signal of the motor controller; based on the time-domain signal, a first radiated emission result of the motor controller under unshielded wire conditions is determined, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under unshielded wire conditions; a target attenuation factor matching the first radiated emission result is determined, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding wire; and a second radiated emission result corresponding to the target attenuation factor is determined, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded wire conditions. In other words, this embodiment of the invention obtains the time-domain signal of the motor controller by performing information simulation on the obtained equivalent circuit of the motor controller. Based on the time-domain signal, the first radiated emission result of the motor controller under unshielded wire conditions can be determined. Further determining the target attenuation factor matching the first radiated emission result allows for the determination of the second radiated emission result corresponding to the target attenuation factor, thereby achieving the technical effect of improving the accuracy of radiation simulation results under simulated shielded wire conditions and solving the technical problem of low accuracy of radiation simulation results under simulated shielded wire conditions. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a flowchart of a simulation method for radiative emission results according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of an artificial power network enclosure according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a test bench according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of a signal simulation model according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of a field calculation model according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of a CST-based motor controller radiated emission test system model according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of an unshielded wire model established by CST according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of a shielded wire model established by CST according to an embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of an attenuation factor waveform according to an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of attenuation factor fitting according to an embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of the radiated emission intensity of a motor controller under shielded wire conditions according to an embodiment of the present invention;

[0029] Figure 12 This is a schematic diagram of a simulation device for radiative emission results according to an embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first," "second," etc., in the specification and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Example 1

[0033] According to an embodiment of the present invention, an embodiment of a simulation method for radiated emission results is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0034] Figure 1 This is a flowchart of a simulation method for radiated emission results according to an embodiment of the present invention, such as... Figure 1 As shown, the method may include the following steps:

[0035] Step S102: Obtain the equivalent circuit of the motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller.

[0036] In the technical solution provided in step S102 of the present invention, an equivalent circuit of the motor controller can be obtained. The structure of the equivalent circuit matches the structure of the motor controller. The equivalent circuit can be a circuit that matches the structure of the motor controller obtained after simulating its structure. The structure of the motor controller can be a structure composed of the required structure and environment for testing the motor controller; for example, it can be a structure composed of the controller structure, the motor structure, and the testing environment. This is merely an example and does not impose specific limitations on the structure of the motor controller.

[0037] Optionally, this embodiment can establish the structure of the motor controller based on the High Frequency Structure Simulator (HFSS) platform. By establishing the structure of the motor controller, the structure of the motor controller can be obtained. By performing high frequency structure simulation on the obtained structure of the motor controller, an equivalent circuit matching the structure of the motor controller can be obtained.

[0038] Step S104: Perform information simulation on the equivalent circuit to obtain the time-domain signal of the motor controller.

[0039] In the technical solution provided in step S104 of the present invention, an equivalent circuit matching the structure of the motor controller can be obtained. Information simulation of the obtained equivalent circuit can yield the time-domain signal of the motor controller. This time-domain signal can include voltage and current time-domain signals, and can be used to represent the change in amplitude of the motor controller's signal over time. For example, it can represent the change in amplitude of the motor controller's electrical signal over time. This is merely an example and does not impose any specific limitations on the time-domain signal of the motor controller.

[0040] Optionally, the equivalent circuit can be simulated in a first simulation analysis software (e.g., Simplir) to obtain the time-domain signal of the motor controller.

[0041] Step S106: Determine the first radiated emission result of the motor controller under unshielded wire conditions based on the time domain signal, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under unshielded wire conditions.

[0042] In the technical solution provided in step S106 of the present invention, the first radiated emission result of the motor controller under unshielded cable conditions can be determined by the obtained time-domain signal of the motor controller. The unshielded cable can be used in an interference-free environment; for example, it can be an unshielded twisted pair cable. This is merely an example and does not impose any specific limitations on the determination of the unshielded cable. The first radiated emission result can be used to characterize the radiated emission intensity of the motor controller under unshielded cable conditions.

[0043] Optionally, the obtained time-domain signal of the motor controller can be injected into the HFSS platform, and the radiated emission simulation of the motor controller under unshielded wire conditions can be performed using a second simulation analysis software (such as ANSYS) to obtain the first radiated emission result of the motor controller under unshielded wire conditions.

[0044] Step S108: Determine the target attenuation factor that matches the first radiated emission result, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding wire.

[0045] In the technical solution provided by step S108 of the present invention, a target attenuation factor matching the first radiated emission result of the motor controller under unshielded conditions can be determined by using the determined first radiated emission result of the motor controller. The target attenuation factor can characterize the degree to which the shielding wire suppresses the radiated emission result of the motor controller. It can be a measure of the attenuation of rays passing through an object of a certain thickness. For example, when an object is placed between the radiation source and the receiving point, the target attenuation factor can be the ratio of the incident radiation flux to the radiation flux density at the receiving point. This is merely an example and does not impose specific limitations on the determination of the target attenuation factor.

[0046] Optionally, a target attenuation factor matching the first radiative emission result can be obtained using Computer Simulation Technology (CST) software.

[0047] Step S110: Determine the second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under the shielded wire condition.

[0048] In the technical solution provided by step S110 of the present invention, a second radiated emission result corresponding to the target attenuation factor can be determined by using a target attenuation factor that matches the first radiated emission result. The second radiated emission result can be used to characterize the radiated emission intensity of the motor controller under shielded cable conditions. The shielded cable can be used in environments with interference; for example, the shielded cable can be a shielded twisted pair cable. This is merely an example and does not impose specific limitations on the determination of the shielded cable.

[0049] Optionally, by using the first radiated emission result of the motor controller under unshielded conditions and the target attenuation factor that matches the first radiated emission result, the target attenuation factor can be superimposed on the first radiated emission result after simulation processing. Considering the degree of suppression of the radiated emission result of the motor controller, the second radiated emission result corresponding to the target attenuation factor can be obtained, thereby achieving the technical effect of improving the accuracy of the radiation simulation results under the simulated shielded conditions.

[0050] In steps S102 to S110 of the present invention, an equivalent circuit of the motor controller is obtained, wherein the structure of the equivalent circuit matches the structure of the motor controller; information simulation is performed on the equivalent circuit to obtain the time-domain signal of the motor controller; based on the time-domain signal, a first radiated emission result of the motor controller under unshielded wire conditions is determined, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under unshielded wire conditions; a target attenuation factor matching the first radiated emission result is determined, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding wire; and a second radiated emission result corresponding to the target attenuation factor is determined, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded wire conditions. In other words, the embodiments of the present invention obtain the time-domain signal of the motor controller by simulating the information of the equivalent circuit of the obtained motor controller. Based on the time-domain signal, the first radiated emission result of the motor controller under the unshielded wire condition can be determined. Furthermore, the target attenuation factor matching the first radiated emission result can be determined, and the second radiated emission result corresponding to the target attenuation factor can be determined. This achieves the technical effect of improving the accuracy of the radiation simulation results under the simulated shielded wire condition and solves the technical problem of low accuracy of the radiation simulation results under the simulated shielded wire condition.

[0051] The method described in this embodiment will be further described below.

[0052] As an optional embodiment, step S108, determining the target attenuation factor that matches the first radiated emission result, includes: performing radiated emission simulation on the motor controller to obtain the first radiated emission result of the motor controller under unshielded wire conditions and the third radiated emission result under shielded wire conditions, wherein the third radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded wire conditions in the test simulation circuit; and determining the target attenuation factor based on the first radiated emission result and the third radiated emission result.

[0053] In this embodiment, radiated emission simulation of the motor controller yields a first radiated emission result under unshielded conditions and a third radiated emission result under shielded conditions. Based on these results, an attenuation factor can be determined. The third radiated emission result can be used to characterize the radiated emission intensity of the motor controller under shielded conditions in the test simulation circuit.

[0054] Optionally, the radiated emission simulation of the motor controller under unshielded wire and shielded wire conditions can be performed using the second simulation analysis software to obtain the first radiated emission result of the motor controller under unshielded wire conditions and the third radiated emission result under shielded wire conditions.

[0055] As an optional embodiment, determining the target attenuation factor based on the first radiative emission result and the third radiative emission result includes: determining the difference between the first radiative emission result and the third radiative emission result as the attenuation factor; and determining the target attenuation factor based on the attenuation factor.

[0056] In this embodiment, the first radiated emission result of the motor controller under unshielded wire conditions and the third radiated emission result under shielded wire conditions are obtained, and the difference between the first radiated emission result and the third radiated emission result is determined. The difference between the determined first radiated emission result and the third radiated emission result can be determined as the attenuation factor.

[0057] Optionally, the attenuation factor of the radiated emission from the shielded wire to the motor controller can be obtained using CST software. However, due to significant abrupt changes in the waveform of the obtained attenuation factor, it is impossible to superimpose it onto the first radiated emission result after simulation processing to obtain the second radiated emission result. Therefore, it is necessary to determine a target attenuation factor based on the given attenuation factor. This can be achieved by superimposing the determined target attenuation factor onto the first radiated emission result after simulation processing, while considering the degree of suppression of the radiated emission from the motor controller, to obtain the second radiated emission result corresponding to the target attenuation factor. This technical effect improves the accuracy of the radiation simulation results under the simulated shielded wire condition.

[0058] As an optional implementation method, determining the target attenuation factor based on the attenuation factor includes: determining the shielding characteristics of the motor controller; and fitting the attenuation factor based on the shielding characteristics to obtain the target attenuation factor.

[0059] In this embodiment, the shielding characteristics of the motor controller can be determined. Based on these characteristics, the obtained attenuation factor can be fitted to obtain the target attenuation factor. The shielding characteristics can be the type of shielding wire, such as aluminum foil shielding or braided mesh shielding; these are merely illustrative examples, and no specific limitations are imposed on the shielding characteristics. The fitting method can be linear fitting, logarithmic fitting, etc. It should be noted that the fitting method can be selected based on the actual situation, and no specific limitations are imposed on the fitting method here.

[0060] Optionally, the shielding characteristics of the motor controller can be determined based on the different types of shielding wires. By using the determined shielding characteristics of the motor controller, the obtained attenuation factor is curve-fitted to obtain the target attenuation factor, thus yielding more accurate radiation simulation results under the shielding wire condition.

[0061] As an optional embodiment, the attenuation factor is fitted based on the shielding wire characteristics to obtain the target attenuation factor, including: in response to the shielding wire characteristics being aluminum foil shielding wire characteristics, the attenuation factor is linearly fitted to obtain the target attenuation factor.

[0062] In this embodiment, the shielding characteristics of the motor controller can be determined. When the determined shielding characteristics of the motor controller are aluminum foil shielding characteristics, in response to the determined shielding characteristics being aluminum foil shielding characteristics, the obtained attenuation factor can be linearly fitted to obtain the target attenuation factor. Here, linear fitting is a form of curve fitting, which can seek the best estimate of parameters and the best theoretical curve through the observed values ​​of functions and variables. Linear fitting can be a form of curve fitting when the function is a linear function of the parameters.

[0063] Optionally, aluminum foil shielded wire can be used to shield high-frequency electromagnetic waves, which can prevent high-frequency electromagnetic waves from contacting the network cable conductor, thereby preventing induced current and increased crosstalk. The black wire in the aluminum foil shielded wire is a grounding connection.

[0064] As an optional embodiment, fitting the attenuation factor based on the shielding wire characteristics to obtain the target attenuation factor includes: in response to the shielding wire characteristics being braided shielding wire characteristics, performing logarithmic fitting on the attenuation factor to obtain the target attenuation factor.

[0065] In this embodiment, the shielding characteristics of the motor controller can be determined. When the determined shielding characteristics of the motor controller are braided mesh shielding characteristics, in response to the determined shielding characteristics being braided mesh shielding characteristics, logarithmic fitting can be performed on the obtained attenuation factor to obtain the target attenuation factor. Here, logarithmic fitting is a form of curve fitting, and logarithmic fitting can be a form of curve fitting when the function is a logarithmic function with parameters.

[0066] Alternatively, braided wire shielding is typically made of tinned round copper wire. The braided mesh in the braided wire shielding is the grounding wire. Therefore, the grounding of the braided wire shielding is a 360-degree loop, which can produce a better effect on suppressing high-frequency interference.

[0067] As an optional embodiment, step S110, determining the second radiative emission result corresponding to the target attenuation factor, includes: determining the second radiative emission result as the sum of the target attenuation factor and the first radiative emission result.

[0068] In this embodiment, the sum of the determined target attenuation factor and the determined first radiative emission result can be determined as the second radiative emission result by using the determined first radiative emission result and the target attenuation factor that matches the first radiative emission result.

[0069] Optionally, the target attenuation factor obtained through CST software can be superimposed on the first radiated emission result of the motor controller under unshielded wire conditions obtained through the second simulation analysis software to obtain the second radiated emission result.

[0070] Optionally, since high-voltage cables are the primary coupling path for radiated emissions from new energy motor controllers, shielded cables are typically used. However, the second simulation analysis software cannot model shielded cables. Therefore, this embodiment obtains the target attenuation factor of the radiated emissions from the shielded cable to the motor controller using CST software, and superimposes the obtained target attenuation factor onto the first radiated emission result obtained through the second simulation analysis software to obtain the second radiated emission result. This achieves the technical effect of improving the accuracy of radiation simulation results under the simulated shielded cable condition, and solves the technical problem of low accuracy of radiation simulation results under the simulated shielded cable condition.

[0071] This embodiment obtains the equivalent circuit of the motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller; performs information simulation on the equivalent circuit to obtain the time-domain signal of the motor controller; determines the first radiated emission result of the motor controller under unshielded conditions based on the time-domain signal, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under unshielded conditions; determines a target attenuation factor matching the first radiated emission result, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding line; and determines the second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded conditions. In other words, this embodiment of the invention obtains the time-domain signal of the motor controller by performing information simulation on the obtained equivalent circuit of the motor controller, and based on the time-domain signal, determines the first radiated emission result of the motor controller under unshielded conditions, further determines the target attenuation factor matching the first radiated emission result, and determines the second radiated emission result corresponding to the target attenuation factor, thereby achieving the technical effect of improving the accuracy of radiation simulation results under simulated shielded conditions and solving the technical problem of low accuracy of radiation simulation results under simulated shielded conditions.

[0072] Example 2

[0073] The technical solutions of the embodiments of the present invention will be illustrated below with reference to preferred embodiments.

[0074] Currently, with the rapid development of new energy vehicles, although they are more energy-efficient and environmentally friendly than traditional vehicles, they face challenges such as electromagnetic compatibility (EMC). As a high-power component in vehicles, the motor controller system is gradually becoming smaller and more efficient. With the application of silicon carbide modules, its switching speed is also increasing, generating large-energy and wide-bandwidth electromagnetic interference, making it a major source of interference for new energy vehicles. The EMC generated by the motor controller system not only affects its own reliability but also the safe operation of the entire vehicle and neighboring vehicles, making it crucial for vehicles to meet relevant EMC standards. Therefore, researching the generation mechanism, interference prediction, and interference suppression methods of motor controller EMC is of great significance to the development of new energy vehicles. Electromagnetic interference is divided into conducted emission and radiated emission. The EMC generated by the high-speed switching of power switching devices radiates outwards through space and also propagates through conducted emission in components, connectors, and cables. Among these, radiated emission in space has always been a challenging problem in EMC research.

[0075] To address the aforementioned issues, a simulation system for conducted electromagnetic interference (EMI) in the power circuit of an electric vehicle AC motor controller is proposed. This system divides the electric drive system into three parts: a cable model simulation module, an inverter power circuit simulation module, and a power circuit signal acquisition module. While modeling and simulating these components, it fails to model the source of interference (such as power switching devices), thus hindering the analysis of the root causes and propagation paths of conducted interference. It cannot effectively analyze and suppress conducted interference from within the electric drive itself. Furthermore, the system only simulates conducted emissions, neglecting radiated emissions. Its simulation model only includes the tested device, excluding the entire electromagnetic compatibility (EMC) anechoic chamber testing environment, such as the Line Impedance Stabilization Network (LISN) and test table. This results in simulation results that cannot be effectively compared with actual test results, leading to low accuracy in radiated emissions simulations under shielded cable conditions.

[0076] A model for the electromagnetic interference (EMI) emission circuit of a new energy vehicle motor drive system is also proposed. This model can analyze common-mode and differential-mode interference paths, establish a conduction voltage transfer function, and obtain the influencing factors that generate common-mode and differential-mode EMI. However, it has the problem of not being able to model based on the source of EMI generation. A method for establishing a vehicle EMI model suitable for complex automotive structures is also proposed. This method establishes a model for the complex structure of the entire vehicle, performs simplification and mesh generation, saving the computer memory and computation time required for simulation. However, it cannot accurately model the internal structure of the electric drive system, resulting in low accuracy of radiation simulation results under the condition of simulating shielded wires.

[0077] This embodiment proposes a simulation method for radiated emission results, which can accurately predict, evaluate and analyze the radiated simulation results of motor controllers under shielded wire conditions in the early stage of product design, and guide the forward design of products. At the same time, it avoids the problems of high rectification costs, long cycles and many iterations when products fail the radiated simulation test. In addition, it overcomes the shortcomings of the second simulation analysis software that cannot use the characteristics of braided wire shielding for modeling.

[0078] This embodiment obtains the target attenuation factor using CST software. This target attenuation factor is then superimposed onto the first simulation result obtained using a second simulation analysis software to obtain the second radiated emission result. This achieves the technical effect of improving the accuracy of radiation simulation results under simulated shielding conditions. This embodiment uses the second simulation analysis software to obtain the interference voltage and current of the actual device, and CST software to build a complete structural model including the shielding wire, maximizing the advantages of both software programs. This embodiment employs a multi-level joint modeling method, using a technical path of "decomposition-modeling-verification-integration-field-circuit co-simulation" to establish accurate models of the power switching device, motor controller, and test environment, and to obtain the radiation characteristics of the motor controller.

[0079] This embodiment establishes the structure of a motor controller based on the HFSS platform. Using this established structure, the motor controller's structure is acquired, and high-frequency structural simulation is performed to obtain an equivalent circuit matching the motor controller's structure. Information simulation is then performed on the obtained equivalent circuit in a first simulation analysis software to obtain the time-domain signal of the motor controller. This time-domain signal is injected into the HFSS platform, and radiated emission simulation of the motor controller under unshielded conditions is performed using a second simulation analysis software to obtain the first radiated emission result of the motor controller under unshielded conditions. A target attenuation factor matching the first radiated emission result is determined using CST software. Using the first radiated emission result of the motor controller under unshielded conditions and the target attenuation factor matching it, the target attenuation factor can be simulated and superimposed onto the first radiated emission result. Considering the degree of suppression of the motor controller's radiated emission result, a second radiated emission result corresponding to the target attenuation factor can be obtained, thereby improving the accuracy of radiation simulation results under shielded conditions.

[0080] In this embodiment of the invention, before testing the radiated emission function of the motor controller, a test structure model including a test bench needs to be built. The test structure model includes an artificial power network structure, a controller structure, a motor structure, and a test bench.

[0081] Figure 2 This is a schematic diagram of an artificial power network enclosure according to an embodiment of the present invention, such as... Figure 2 As shown, the artificial power network structure is an open cuboid. The influence of its internal structure on electromagnetic propagation is characterized by the equivalent circuit of the connection port. Therefore, the artificial power network structure only needs to build an artificial power network shell.

[0082] The controller structure consists of a controller housing, power modules, capacitor structure, and copper busbars. The controller housing, power modules, and capacitor structure are modeled and verified separately to obtain an accurate controller structure.

[0083] The motor structure consists of a motor housing, stator coils, and rotor core. Since the motor body only serves as a load and does not generate interference, it is simplified in structural modeling, retaining only the motor housing as a common-mode interference loop to characterize electromagnetic propagation characteristics.

[0084] Figure 3 This is a schematic diagram of a test bench according to an embodiment of the present invention, as shown below. Figure 3 As shown, the test bench and grounding metal plate adopt a surface structure and are set as finite conductor boundaries. The material used is the actual material of the test bench.

[0085] Figure 4 This is a schematic diagram of a signal simulation model according to an embodiment of the present invention, such as... Figure 4 As shown, the signal simulation model includes: a high-voltage power supply 401, an artificial power supply network circuit 402, a structural equivalent circuit 403, a power device 404, and a motor load equivalent circuit 405. Then, the signal simulation model is jointly simulated to obtain a time-domain signal, which is used as the input to the field calculation model.

[0086] Figure 5 This is a schematic diagram of a field calculation model according to an embodiment of the present invention, such as... Figure 5 As shown, the field calculation model includes: an artificial power network 501, cables 502, a motor 503, a controller 504, and a test bench 505. Based on the arrangement of each component and the experimental setup, the structural models of each component are placed in their respective positions on the test bench and connected via cables 502. The time-domain signal obtained from the joint simulation of the signal simulation model is injected into the field calculation model to obtain the first radiated emission result of the motor controller under unshielded conditions.

[0087] Since high-voltage cables are the primary coupling path for radiated emissions from new energy motor controllers, shielded cables are typically used. However, the second simulation analysis software cannot model the shielded cables. Therefore, additional methods are needed to obtain the impact of the shielded cables on radiated emissions, thereby achieving accurate simulation results for radiation emissions under shielded cable conditions. This embodiment proposes a simulation method for radiated emissions results. The target attenuation factor of the shielded cable's radiated emissions to the motor controller is obtained using CST software. This target attenuation factor is then superimposed onto the first radiated emissions result obtained through the second simulation analysis software to obtain the second radiated emissions result. This improves the accuracy of radiation simulation results under shielded cable conditions and solves the problem of low accuracy in radiation simulation results under shielded cable conditions.

[0088] Figure 6 This is a schematic diagram of a CST-based radiated emission test system model for a motor controller according to an embodiment of the present invention, as shown below. Figure 6 As shown, in the CST software simulation environment, the motor controller radiated emission test system model includes: motor 601, controller 602, cable 603, artificial power network 604, and test bench 605. The cables are both unshielded and shielded.

[0089] Figure 7 This is a schematic diagram of an unshielded wire model established by CST according to an embodiment of the present invention, as shown below. Figure 7 As shown, the inner ring of the unshielded wire is the conductor, and the outer ring is the insulation layer.

[0090] Figure 8 This is a schematic diagram of a shielded wire model established by CST according to an embodiment of the present invention, as shown below. Figure 8 As shown, the main characteristic parameters of the shielding wire include material, diameter, and coverage. These parameters can be set according to typical values ​​for shielding wires used in new energy vehicles. The middle loop of the shielding wire is the shielding layer.

[0091] This embodiment uses the first radiated emission result of the motor controller under unshielded wiring and the third radiated emission result under shielded wiring to determine the attenuation factor as the difference between the two results. The attenuation factor can be obtained using CST software.

[0092] Figure 9 This is a schematic diagram of an attenuation factor waveform according to an embodiment of the present invention, such as... Figure 9 As shown, the horizontal axis represents frequency in megahertz (MHz), and the vertical axis represents field strength in decibels (dBuV). The attenuation factor waveform exhibits significant abrupt changes, making it impossible to superimpose the obtained attenuation factor, after simulation processing, into the first radiated emission result to obtain the second radiated emission result. Therefore, based on the given attenuation factor, a target attenuation factor needs to be determined. This target attenuation factor is then superimposed into the first radiated emission result after simulation processing. Considering the suppression degree of the motor controller's radiated emission result, the second radiated emission result corresponding to the target attenuation factor can be obtained. This achieves the technical effect of improving the accuracy of radiation simulation results under the simulated shielded wire condition.

[0093] This embodiment determines the shielding characteristics of the motor controller based on different shielding wire types. By using the determined shielding characteristics of the motor controller, the obtained attenuation factor is curve-fitted to obtain the target attenuation factor, thus achieving more accurate radiation simulation results under shielded wire conditions. When the determined shielding characteristics of the motor controller are aluminum foil shielding, the obtained attenuation factor can be linearly fitted to obtain the target attenuation factor. Aluminum foil shielding can be used to shield high-frequency electromagnetic waves, preventing high-frequency electromagnetic waves from contacting the wire conductor, thereby avoiding induced current and increased crosstalk. The black wire in the aluminum foil shielding is the grounding connection. When the determined shielding characteristics of the motor controller are braided wire, the obtained attenuation factor can be logarithmically fitted to obtain the target attenuation factor. Braided wire is typically made of tinned round copper wire. The braided mesh in the braided wire is the grounding wire; therefore, the grounding of the braided wire is a 360-degree loop, which can produce better suppression of high-frequency interference.

[0094] Figure 10 This is a schematic diagram of attenuation factor fitting according to an embodiment of the present invention, such as... Figure 10 As shown, the horizontal axis represents frequency in megahertz (MHz), and the vertical axis represents field strength in decibels (dBuV). For shielding wires with aluminum foil shielding characteristics, the obtained attenuation factor is linearly fitted. For shielding wires with braided mesh shielding characteristics, the obtained attenuation factor is logarithmically fitted. The fitting results are then superimposed on the first radiation emission results obtained through the second simulation analysis software to achieve the purpose of accurately simulating the radiation simulation results under the shielding wire condition.

[0095] Figure 11 This is a schematic diagram illustrating the radiated emission intensity of a motor controller under shielded wiring conditions according to an embodiment of the present invention, as shown below. Figure 11 As shown, the horizontal axis represents frequency in megahertz (MHz), and the vertical axis represents field strength in decibels (dBuV). The target attenuation factor of the radiated emission of the shielded wire to the motor controller is obtained through CST software. The obtained target attenuation factor is then superimposed on the first radiated emission result obtained through the second simulation analysis software to obtain the second radiated emission result. This achieves the technical effect of improving the accuracy of the radiation simulation results under the simulated shielded wire condition and solves the technical problem of low accuracy of the radiation simulation results under the simulated shielded wire condition.

[0096] This embodiment obtains the equivalent circuit of the motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller; performs information simulation on the equivalent circuit to obtain the time-domain signal of the motor controller; determines the first radiated emission result of the motor controller under unshielded conditions based on the time-domain signal, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under unshielded conditions; determines a target attenuation factor matching the first radiated emission result, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding line; and determines the second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded conditions. In other words, this embodiment of the invention obtains the time-domain signal of the motor controller by performing information simulation on the obtained equivalent circuit of the motor controller, and based on the time-domain signal, determines the first radiated emission result of the motor controller under unshielded conditions, further determines the target attenuation factor matching the first radiated emission result, and determines the second radiated emission result corresponding to the target attenuation factor, thereby achieving the technical effect of improving the accuracy of radiation simulation results under simulated shielded conditions and solving the technical problem of low accuracy of radiation simulation results under simulated shielded conditions.

[0097] Example 3

[0098] According to an embodiment of the present invention, a simulation apparatus for radiative emission results is also provided. It should be noted that this simulation apparatus for radiative emission results can be used to execute the radiative emission result simulation method in Embodiment 1.

[0099] Figure 12 This is a schematic diagram of a simulation device for radiative emission results according to an embodiment of the present invention. Figure 12 As shown, the simulation device 1200 for the radiation emission result may include: an acquisition unit 1202, a simulation unit 1204, a first determination unit 1206, a second determination unit 1208, and a third determination unit 1210.

[0100] The acquisition unit 1202 is used to acquire the equivalent circuit of the motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller.

[0101] Simulation unit 1204 is used to perform information simulation on the equivalent circuit to obtain the time-domain signal of the motor controller.

[0102] The first determining unit 1206 is used to determine the first radiated emission result of the motor controller under the unshielded wire condition based on the time domain signal, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under the unshielded wire condition.

[0103] The second determining unit 1208 is used to determine a target attenuation factor that matches the first radiated emission result, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding wire.

[0104] The third determining unit 1210 is used to determine the second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under the shielded wire condition.

[0105] Optionally, the second determining unit 1208 includes: a simulation module for performing radiated emission simulation on the motor controller to obtain a first radiated emission result of the motor controller under unshielded wire conditions and a third radiated emission result under shielded wire conditions, wherein the third radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded wire conditions in the test simulation circuit; and a determining module for determining a target attenuation factor based on the first radiated emission result and the third radiated emission result.

[0106] Optionally, the determining module includes: a first determining submodule, used to determine the difference between the first radiation emission result and the third radiation emission result as an attenuation factor; and a second determining submodule, used to determine a target attenuation factor based on the attenuation factor.

[0107] Optionally, the second determining submodule includes: determining the shielding characteristics of the motor controller; and fitting the attenuation factor based on the shielding characteristics to obtain the target attenuation factor.

[0108] Optionally, the second determining submodule further includes: in response to the shielding wire characteristics being aluminum foil shielding wire characteristics, performing linear fitting on the attenuation factor to obtain the target attenuation factor.

[0109] Optionally, the second determining submodule further includes: in response to the shielding wire characteristics being braided shielding wire characteristics, performing logarithmic fitting on the attenuation factor to obtain the target attenuation factor.

[0110] Optionally, the third determining unit 1210 includes: a determining module, used to determine the sum of the target attenuation factor and the first radiative emission result as the second radiative emission result.

[0111] In this embodiment of the invention, the equivalent circuit of the motor controller is acquired by the acquisition unit 1202, wherein the structure of the equivalent circuit matches the structure of the motor controller. The simulation unit 1204 performs information simulation on the equivalent circuit to obtain the time-domain signal of the motor controller. The first determination unit 1206 determines the first radiated emission result of the motor controller under the unshielded wire condition based on the time-domain signal, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under the unshielded wire condition. The second determination unit 1208 determines the target attenuation factor that matches the first radiated emission result, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding wire. The third determination unit 1210 determines the second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under the shielding wire condition. In other words, the embodiments of the present invention obtain the time-domain signal of the motor controller by simulating the information of the equivalent circuit of the obtained motor controller. Based on the time-domain signal, the first radiated emission result of the motor controller under the unshielded wire condition can be determined. Furthermore, the target attenuation factor matching the first radiated emission result can be determined, and the second radiated emission result corresponding to the target attenuation factor can be determined. This achieves the technical effect of improving the accuracy of the radiation simulation results under the simulated shielded wire condition and solves the technical problem of low accuracy of the radiation simulation results under the simulated shielded wire condition.

[0112] Example 4

[0113] According to an embodiment of the present invention, a vehicle is also provided for performing a simulation method for any of the radiation emission results in Embodiment 1.

[0114] Example 5

[0115] According to an embodiment of the present invention, a computer-readable storage medium is also provided, the storage medium including a stored program, wherein the program executes the simulation method for radiative emission results in Embodiment 1.

[0116] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0117] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0118] In the several embodiments provided by this invention, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces; the indirect coupling or communication connection of units or modules can be electrical or other forms.

[0119] The units defined as separate components may or may not be physically separate. Similarly, the components displayed as units may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0120] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0121] If the integrated unit is implemented as 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 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. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0122] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A simulation method for radiative emission results, characterized in that, include: Obtain the equivalent circuit of the motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller; Information simulation is performed on the equivalent circuit to obtain the time-domain signal of the motor controller; The first radiated emission result of the motor controller under the unshielded wire condition is determined based on the time domain signal, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under the unshielded wire condition; Determine a target attenuation factor that matches the first radiated emission result, wherein the target attenuation factor is used to characterize the degree to which the shielding wire suppresses the radiated emission result of the motor controller; Determine the second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded wire conditions.

2. The method according to claim 1, characterized in that, Determining the target attenuation factor that matches the first radiated emission result includes: The motor controller is subjected to radiated emission simulation to obtain a first radiated emission result of the motor controller under unshielded wire condition and a third radiated emission result under shielded wire condition. The third radiated emission result is used to characterize the radiated emission intensity of the motor controller under shielded wire condition in the test simulation circuit. The target attenuation factor is determined based on the first radiation emission result and the third radiation emission result.

3. The method according to claim 2, characterized in that, Based on the first radiative emission result and the third radiative emission result, the target attenuation factor is determined, including: The difference between the first radiation emission result and the third radiation emission result is determined as the attenuation factor; Based on the attenuation factor, the target attenuation factor is determined.

4. The method according to claim 3, characterized in that, Determining the target attenuation factor based on the attenuation factor includes: Determine the characteristics of the shielding wire of the motor controller; The attenuation factor is obtained by fitting the attenuation factor based on the characteristics of the shielding wire.

5. The method according to claim 4, characterized in that, The attenuation factor is obtained by fitting the attenuation factor based on the characteristics of the shielding wire, including: In response to the fact that the shielding wire has aluminum foil shielding characteristics, the attenuation factor is linearly fitted to obtain the target attenuation factor.

6. The method according to claim 4, characterized in that, The attenuation factor is obtained by fitting the attenuation factor based on the characteristics of the shielding wire, including: In response to the fact that the shielding wire has the characteristics of a braided shielding wire, the attenuation factor is logarithmically fitted to obtain the target attenuation factor.

7. The method according to claim 1, characterized in that, Determining the second radiative emission result corresponding to the target attenuation factor includes: The sum of the target attenuation factor and the first radiative emission result is determined as the second radiative emission result.

8. A simulation device for radiation emission results, characterized in that, include: An acquisition unit is used to acquire the equivalent circuit of the motor controller, wherein the structure of the equivalent circuit matches the structure of the motor controller; The simulation unit is used to perform information simulation on the equivalent circuit to obtain the time-domain signal of the motor controller; The first determining unit is configured to determine the first radiated emission result of the motor controller under the unshielded wire condition based on the time domain signal, wherein the first radiated emission result is used to characterize the radiated emission intensity of the motor controller under the unshielded wire condition; The second determining unit is used to determine a target attenuation factor that matches the first radiated emission result, wherein the target attenuation factor is used to characterize the degree of suppression of the radiated emission result of the motor controller by the shielding wire; The third determining unit is used to determine the second radiated emission result corresponding to the target attenuation factor, wherein the second radiated emission result is used to characterize the radiated emission intensity of the motor controller under the shielding condition.

9. A vehicle, characterized in that, A simulation method for performing the radiative emission results as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the program executes the simulation method for radiative emission results according to any one of claims 1 to 7.

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