Method and device for simulating radiation emission of electric drive system, electronic equipment and medium

Abstract

The application discloses a kind of radiation emission simulation method, device, electronic equipment and medium of electric drive system, wherein the radiation emission simulation method of electric drive system includes: the structure model of the hardware structure of the electric drive system of vehicle and the test bench associated with electric drive system is constructed;According to structure model, the circuit simulation model of electric drive system and test bench is constructed;Conduction emission simulation is carried out to circuit simulation model, and first simulation result is obtained;First simulation result is updated back to structure model using preset port and is handled, and spatial model is obtained;Radiation emission simulation is carried out to the spatial model obtained by updating, and radiation emission simulation result is obtained.The application solves the technical problems that the radiation emission simulation of electric drive system in the prior art is not accurate, and then leads to the technical problem that the electromagnetic compatibility of electric drive system exceeds the standard.

Description

Technical Field

[0001] This invention relates to the field of electric drive system technology, and more specifically, to a method, apparatus, electronic device, and medium for simulating the radiation emission of an electric drive system. Background Technology

[0002] Compared to traditional vehicles, new energy vehicles offer advantages such as greater energy efficiency and environmental friendliness, but they also present new challenges, one of which is electromagnetic compatibility (EMC). As a high-power component in new energy vehicles, the electric drive system is constantly evolving towards lighter weight and higher voltage. With the application of silicon carbide in its internal chips, the switching frequency is increasing, resulting in high-energy, wide-bandwidth electromagnetic interference (EMC), making it a major source of EMC interference within the vehicle. The EMC generated by the electric drive system not only affects its own reliability but also the normal function of other components within the vehicle, becoming crucial for new energy vehicles to pass relevant EMC standards. Its EMC consists of conducted and radiated emissions. The EMC generated by the high-speed switching of power switching devices radiates outwards through space and also propagates through conducted emissions in components, connectors, and cables. Among these, radiated emissions in space have always been a challenging aspect of EMC research.

[0003] Existing technologies for simulating radiated emissions only include the tested object in the simulation model, excluding the entire EMC anechoic chamber testing environment, such as high and low voltage LISNs and copper tables. Therefore, the simulation results cannot be effectively compared with actual test results. Under these circumstances, existing technologies result in inaccurate radiated emission simulations of electric drive systems, leading to electromagnetic compatibility (EMC) exceedances in related products. Summary of the Invention

[0004] This invention provides a method, apparatus, electronic device, and medium for simulating the radiated emissions of an electric drive system, thereby at least solving the technical problem that the existing technology does not accurately simulate the radiated emissions of electric drive systems, leading to electromagnetic compatibility exceeding the limits of the electric drive system.

[0005] According to a first aspect of the present invention, a method for simulating radiated emissions from an electric drive system is provided, comprising:

[0006] A structural model of the vehicle's electric drive system and the hardware structure of the test bench associated with the electric drive system is constructed. Based on the structural model, a circuit simulation model of the electric drive system and the test bench is constructed. Conducted emission simulation is performed on the circuit simulation model to obtain the first simulation result. The first simulation result is back-engineered into the structural model using a preset port for updating to obtain the spatial model. Radiated emission simulation is performed on the updated spatial model to obtain the radiated emission simulation result.

[0007] Optionally, the electric drive system includes a motor and an inverter; the structural model for constructing the hardware structure of the vehicle's electric drive system and the test bench associated with the electric drive system includes: structural modeling of the hardware structure of the motor and inverter to obtain a first sub-model; structural modeling of the hardware structure of the test bench to obtain a second sub-model; and determining the structural model based on the first and second sub-models.

[0008] Optionally, the inverter includes an inverter housing, capacitor busbars, a drive board, a control board, and an insulated gate bipolar transistor (IGBT) module. The first sub-model is obtained by structurally modeling the hardware structure of the motor and inverter, including: separately modeling the inverter housing, capacitor busbars, drive board, control board, and IGBT module and combining them to obtain an inverter structural model; structurally modeling the motor to obtain a motor structural model; and determining the first sub-model based on the inverter structural model and the motor structural model.

[0009] Optionally, structural modeling of the insulated gate bipolar transistor (IGBT) module includes: decomposing the IGBT module into multiple IGBT sub-modules; modeling the multiple IGBT sub-modules separately and combining them to obtain an IGBT module structural model, wherein the IGBT module structural model is used to determine the inverter structural model.

[0010] Optionally, modeling and combining multiple insulated-gate bipolar transistor (IGBT) sub-modules to obtain an IGBT module structure model includes: modeling and combining multiple IGBT sub-modules to obtain an initial IGBT module structure model, which includes ports; simulating the impedance of the ports of the initial IGBT module structure model to obtain a second simulation result, which includes the simulated impedance of the ports; matching the simulated impedance with a preset impedance range to obtain a matching result; and optimizing the initial structure model based on the simulated impedance to obtain an IGBT module structure model, in response to the matching result indicating that the simulated impedance is not within the preset impedance range.

[0011] Optionally, based on the structural model, constructing circuit simulation models for the electric drive system and test bench includes: determining the equivalent circuit parameters of each structure in the structural model based on the structural model; constructing a circuit model based on the actual circuit of the electric drive system and test bench; and determining the circuit simulation model based on the equivalent circuit parameters and the circuit model.

[0012] Optionally, the radiated emission simulation method for the electric drive system also includes: comparing the radiated emission simulation results with a preset standard to obtain comparison results; and optimizing the spatial model based on the comparison results.

[0013] According to a second aspect of the present invention, a radiated emission simulation apparatus for an electric drive system is also provided, comprising:

[0014] The first construction module is used to construct a structural model of the vehicle's electric drive system and the hardware structure of the test bench associated with the electric drive system; the second construction module is used to construct a circuit simulation model of the electric drive system and the test bench based on the structural model; the first simulation module is used to perform conducted emission simulation on the circuit simulation model to obtain a first simulation result; the third construction module is used to use a preset port to back-engineer the first simulation result back into the structural model for updating processing to obtain a spatial model; the second simulation module is used to perform radiated emission simulation on the updated spatial model to obtain radiated emission simulation results.

[0015] Optionally, the electric drive system includes a motor and an inverter; the first building module is also used to: perform structural modeling of the hardware structure of the motor and inverter to obtain a first sub-model; perform structural modeling of the hardware structure of the test bench to obtain a second sub-model; and determine the structural model based on the first sub-model and the second sub-model.

[0016] Optionally, the inverter includes an inverter housing, capacitor busbars, a drive board, a control board, and an insulated gate bipolar transistor (IGBT) module; the first building module is also used to: perform structural modeling on the inverter housing, capacitor busbars, drive board, control board, and IGBT module respectively and combine them to obtain an inverter structural model; perform structural modeling on the motor to obtain a motor structural model; and determine a first sub-model based on the inverter structural model and the motor structural model.

[0017] Optionally, the first building module is also used to: decompose the insulated gate bipolar transistor (IGBT) module to obtain multiple IGBT sub-modules; model the multiple IGBT sub-modules respectively and combine them to obtain an IGBT module structural model, wherein the IGBT module structural model is used to determine the inverter structural model.

[0018] Optionally, the first building module is further configured to: model and combine multiple insulated-gate bipolar transistor (IGBT) sub-modules to obtain an initial IGBT module structure model, the initial IGBT module structure model including ports; simulate the impedance of the ports of the initial IGBT module structure model to obtain a second simulation result, wherein the second simulation result includes the simulated impedance of the ports; match the simulated impedance with a preset impedance range to obtain a matching result; and, in response to the matching result indicating that the simulated impedance is not within the preset impedance range, optimize the initial structure model based on the simulated impedance to obtain an IGBT module structure model.

[0019] Optionally, the second building module is also used to: determine the equivalent circuit parameters of each structure in the structural model based on the structural model; construct a circuit model based on the actual circuit of the electric drive system and the actual circuit of the test bench; and determine the circuit simulation model based on the equivalent circuit parameters and the circuit model.

[0020] Optionally, the radiation emission simulation device for the electric drive system also includes an optimization module. The optimization module is used for the radiation emission simulation method of the electric drive system, which includes: comparing the radiation emission simulation results with a preset standard to obtain comparison results; and optimizing the spatial model based on the comparison results.

[0021] According to a third aspect of the present invention, an electronic device is also provided, the electronic device including a memory and a processor, the memory storing a computer program, and the processor being configured to run the computer program to perform the radiated emission simulation method of the electric drive system in any of the first aspects described above.

[0022] According to a fourth aspect of the present invention, a non-volatile storage medium is also provided, wherein a computer program is stored in the non-volatile storage medium, wherein the computer program is configured to execute the radiated emission simulation method of the electric drive system in any of the first aspects when running on a computer or processor.

[0023] In this embodiment of the invention, a structural model of the vehicle's electric drive system and the hardware structure of the test bench associated with the electric drive system is first constructed. Then, based on the structural model, a circuit simulation model of the electric drive system and the test bench is constructed. Conducted emission simulation is performed on the circuit simulation model to obtain a first simulation result. Next, the first simulation result is back-reamed back to the structural model using a preset port for updating, resulting in a spatial model. Finally, radiated emission simulation is performed on the updated spatial model to obtain radiated emission simulation results. The radiated emission simulation method for the electric drive system provided by this invention considers the electric drive system and the test bench as a whole before simulation, constructing a structural model, a circuit simulation model, and a spatial model respectively. Finally, radiated emission simulation is performed on the spatial model to obtain a more accurate radiated emission simulation result that takes the test bench into account. This solves the technical problem of inaccurate radiated emission simulation of the electric drive system in the prior art, which leads to electromagnetic compatibility exceeding the limits of the electric drive system. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0025] Figure 1 This is a flowchart of a radiated emission simulation method for an electric drive system according to one embodiment of the present invention;

[0026] Figure 2 This is a flowchart of the modeling process for an insulated gate bipolar transistor module according to one embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of a circuit simulation model according to one embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the first simulation result according to one embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of a spatial model according to one embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the radiated emission simulation results according to one embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the third simulation result according to one embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the fourth simulation result according to one embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the fifth simulation result according to one embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the sixth simulation result according to one embodiment of the present invention;

[0035] Figure 11 This is a schematic flowchart of a radiated emission simulation method for an electric drive system according to one embodiment of the present invention;

[0036] Figure 12 This is a structural block diagram of a radiation emission simulation device for an electric drive system according to one embodiment of the present invention. Detailed Implementation

[0037] 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.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, 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 terms can be used interchangeably where appropriate so that 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 a 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.

[0039] According to an embodiment of the present invention, an embodiment of a radiated emission simulation method for an electric drive system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system containing at least one 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.

[0040] This method embodiment can also be executed in an electronic device, similar control device, or mobile terminal that includes a memory and a processor. Taking an electronic device as an example, the electronic device may include one or more processors and a memory for storing data. Optionally, the aforementioned electronic device may also include a communication device for communication functions and a display device. Those skilled in the art will understand that the above structural description is merely illustrative and does not limit the structure of the aforementioned electronic device. For example, the electronic device may also include more or fewer components than those described above, or have a different configuration than those described above.

[0041] A processor may include one or more processing units. For example, a processor may include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microcontroller unit (MCU), a field-programmable gate array (FPGA), a neural network processing unit (NPU), a tensor processing unit (TPU), or an artificial intelligence (AI) processor. Different processing units may be independent components or integrated into one or more processors. In some instances, electronic devices may also include one or more processors.

[0042] The memory can be used to store computer programs, such as the computer program corresponding to the radiated emission simulation method of the electric drive system in this embodiment of the invention. The processor implements the radiated emission simulation method of the electric drive system by running the computer program stored in the memory. The memory may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to electronic devices via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0043] The communication device is used to receive or send data via a network. Specific examples of the network mentioned above may include a wireless network provided by the mobile terminal's communication provider. In one example, the communication device includes a network interface controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the communication device may be a radio frequency (RF) module, used for wireless communication with the Internet. In some embodiments of this solution, the communication device is used to connect to mobile devices such as mobile phones and tablets, and can send radiated emission simulation results to the mobile devices.

[0044] The display device can be, for example, a touchscreen liquid crystal display (LCD) and a touch display (also referred to as a "touchscreen" or "touch display"). This LCD allows the user to interact with the user interface of the in-vehicle terminal. In some embodiments, the in-vehicle terminal has a graphical user interface (GUI), which allows the user to interact with the GUI by touching a touch-sensitive surface with fingers and / or gestures. Executable instructions for performing human-machine interaction functions are configured / stored in one or more processor-executable computer program products or readable storage media.

[0045] Figure 1 This is a flowchart of a radiated emission simulation method for an electric drive system according to one embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0046] Step S101: Construct a structural model of the hardware structure of the vehicle's electric drive system and the test bench associated with the electric drive system.

[0047] Specifically, the electric drive system and test bench consist of multiple components, each with its own structure. The structural model of these components is created by using a 3D electromagnetic simulation program. The models corresponding to all the components of the electric drive system and test bench are then combined to obtain the structural model.

[0048] It is important to note that throughout the simulation process, the electric drive system and the test bench are combined and treated as a single unit.

[0049] Step S102: Based on the structural model, construct the circuit simulation model of the electric drive system and the test bench.

[0050] Specifically, the structural model only represents the hardware structure. For subsequent simulation, the circuits corresponding to the electric drive system and test bench also need to be constructed as circuit simulation models. These circuit simulation models are obtained by modeling the actual topology of the electric drive system and test bench using simulation software. When modeling the circuits of the electric drive system and test bench using simulation software, the structural model needs to be integrated into the circuit simulation model. The circuit simulation model is a circuit model with circuit parameters derived from the structural model.

[0051] For example, the structural model is constructed using the simulation software HFSS (High Frequency Simulator Structure), and the circuit simulation model is constructed based on the structural model using the simulation software Simplorer. When constructing the circuit simulation model, the structural model needs to be converted into a model file that can be imported into Simplorer, and then the structural model is imported into the circuit model constructed by Simplorer to obtain the circuit simulation model.

[0052] Step S103: Perform conduction-emission simulation on the circuit simulation model to obtain the first simulation result.

[0053] Specifically, after obtaining the circuit simulation model, the circuit simulation model is used to perform conducted emission simulation to obtain the first simulation result, namely the conducted emission simulation result.

[0054] Reference Figure 4 , Figure 4 This is a schematic diagram of the first simulation result according to one embodiment of the present invention. Figure 4 The horizontal axis represents the frequency of conducted emissions, and the vertical axis represents the voltage across the line impedance stabilization network included in the circuit simulation model. As can be seen from the figure, once the conducted emission frequency exceeds 28MHz, the voltage across the line impedance stabilization network remains at a relatively low level. It should be noted that... Figure 4 The corresponding conducted emission simulation results meet international standards.

[0055] Step S104: Use a preset port to back-engineer the first simulation result back into the structural model for update processing to obtain the spatial model.

[0056] Specifically, when the first simulation result is input into the structural model, the data from the first simulation result needs to be input into the structural model according to the preset ports, that is, different data are input into different ports. The preset ports are the ports of the IGBT (Insulated Gate Bipolar Transistor) module, and the IGBT module includes multiple ports.

[0057] For example, refer to Figure 5 , Figure 5 This is a schematic diagram of a spatial model according to one embodiment of the present invention, such as... Figure 5 As shown, the spatial model includes a motor 10, an inverter 20, wires 30, a power supply 40, an insulating board 50, and a copper table 60. The electric drive system includes the motor 10, inverter 20, wires 30, and power supply 40, while the test bench includes the insulating board 50 and the copper table 60. The insulating board 50 can be made of wood.

[0058] It should be noted that the inverter 20 has a conventional technical structure. Figure 5 The internal structure will no longer be labeled and described.

[0059] Step S105: Perform radiation emission simulation on the updated space model to obtain radiation emission simulation results.

[0060] Specifically, simulation software is used to perform radiative emission simulation on the space model to obtain radiative emission simulation results.

[0061] Reference Figure 6 , Figure 6 This is a schematic diagram of the radiated emission simulation results according to one embodiment of the present invention. Figure 6 The horizontal axis represents the frequency of radiated emission, and the vertical axis represents the voltage across the line impedance stabilization network included in the spatial model. As can be seen from the figure, after the radiated emission frequency exceeds 50MHz, the voltage across the line impedance stabilization network remains at a relatively low level, generally below 60dBuV. It should be noted that... Figure 6 The corresponding radiated emission simulation results meet international standards.

[0062] In this embodiment of the invention, a structural model of the vehicle's electric drive system and the hardware structure of the test bench associated with the electric drive system is first constructed. Then, based on the structural model, a circuit simulation model of the electric drive system and the test bench is constructed. Conducted emission simulation is performed on the circuit simulation model to obtain a first simulation result. Next, the first simulation result is back-reamed back to the structural model using a preset port for updating, resulting in a spatial model. Finally, radiated emission simulation is performed on the updated spatial model to obtain radiated emission simulation results. The radiated emission simulation method for the electric drive system provided by this invention considers the electric drive system and the test bench as a whole before simulation, constructing a structural model, a circuit simulation model, and a spatial model respectively. Finally, radiated emission simulation is performed on the spatial model to obtain a more accurate radiated emission simulation result that takes the test bench into account. This solves the technical problem of inaccurate radiated emission simulation of the electric drive system in the prior art, which leads to electromagnetic compatibility exceeding the limits of the electric drive system.

[0063] It should be noted that simulation methods that only consider the electric drive system cannot effectively compare the radiated emission simulation results with actual test results. Without effective comparison, the accuracy of the radiated emission simulation results cannot be determined, and thus, the electric drive system cannot be optimized. In this application, the simulation model is constructed by considering not only the electric drive system but also the test bench, making the final simulation results more accurate and enabling effective comparison with actual test results.

[0064] Optionally, the electric drive system includes a motor and an inverter. In this embodiment, in step S101, constructing a structural model of the vehicle's electric drive system and the hardware structure of the test bench associated with the electric drive system may include the following steps:

[0065] Step S1011: Perform structural modeling of the hardware structure of the motor and inverter to obtain the first sub-model.

[0066] Step S1012: Perform structural modeling on the corresponding structure of the test bench to obtain the second sub-model.

[0067] Step S1013: Determine the structural model based on the first sub-model and the second sub-model.

[0068] Specifically, when the electric drive system includes a motor and an inverter, the structural model construction process first requires structural modeling of the motor and inverter to obtain a first sub-model, which is a combination of the first sub-model and the motor structural model and inverter structural model. Then, the test bench structure is modeled to obtain a second sub-model. Finally, the first and second sub-models are combined to determine the structural model. In this embodiment, the structural model includes models of the hardware structure of the motor, inverter, and test bench; the three are considered as a whole.

[0069] It should be noted that modeling each component of the drive system separately and then combining them to obtain the first sub-model can make the modeling of the drive system more accurate, thereby making the subsequent simulation analysis results more accurate.

[0070] Optionally, the inverter includes an inverter housing, capacitor busbars, a drive board, a control board, and an insulated gate bipolar transistor module. In this embodiment, in step S1011, structural modeling of the hardware structure of the motor and inverter to obtain the first sub-model may include the following steps:

[0071] Step S1011a: Structural modeling is performed on the inverter housing, capacitor busbar, drive board, control board, and insulated gate bipolar transistor module, and then combined to obtain the inverter structural model.

[0072] Step S1011b: Perform structural modeling on the motor to obtain the motor structural model.

[0073] Step S1011c: Determine the first sub-model based on the inverter structural model and the motor structural model.

[0074] Specifically, when an inverter includes an inverter housing, capacitor busbars, a drive board, a control board, and IGBT modules, structural modeling first requires using modeling software to create structural models of each component. These structural models are then combined to obtain the inverter structural model. Next, the motor is structurally modeled to obtain the motor structural model. Finally, the motor model and the inverter structural model are combined to obtain the first sub-model.

[0075] It should be noted that, furthermore, by modeling each component of the inverter separately and then combining them to obtain the inverter structural model, and then combining the inverter structural model and the motor structural model to obtain the first sub-model, the structural modeling of the inverter can be made more accurate, thereby making the modeling of the entire electric drive system more accurate.

[0076] Optionally, in step S1011a above, structural modeling of the insulated gate bipolar transistor module may include the following steps:

[0077] Step S1011a1: Decompose the insulated gate bipolar transistor module to obtain multiple insulated gate bipolar transistor sub-modules.

[0078] Step S1011a2: Model and combine multiple insulated gate bipolar transistor (IGBT) sub-modules to obtain an IGBT module structure model, wherein the IGBT module structure model is used to determine the inverter structure model.

[0079] Specifically, when modeling the various components of an inverter, modeling the core component, the IGBT module, is particularly important. First, based on the composition of the IGBT module, it is decomposed into multiple IGBT sub-modules. Each of these sub-modules is then modeled separately, resulting in its corresponding structural model. Finally, these sub-module models are combined according to the actual connection configuration of the IGBT modules to obtain the structural model of the Insulated Gate Bipolar Transistor (IGBT) module.

[0080] It should be noted that the insulated gate bipolar transistor module structure model is used in combination with the corresponding structure models of the inverter housing, capacitor busbar, drive board, and control board to determine the inverter structure model.

[0081] For example, in some embodiments, the IGBT module is decomposed into a metal casing, a plastic casing, metal bosses, dielectric, copper strips, ports, connection terminals, and test leads. Each component (IGBT sub-module) of the aforementioned IGBT module is modeled to obtain a structural model of each component. Then, the structural models of each component are combined to obtain the structural model of the IGBT module.

[0082] It should be noted that decomposing the IGBT module into multiple parts and modeling them separately can make the structural modeling of the IGBT module more accurate.

[0083] Optionally, in step S1011a2, modeling and combining multiple insulated-gate bipolar transistor (IGBT) sub-modules to obtain an IGBT module structural model may include the following steps:

[0084] Step Sa21: Model and combine multiple insulated gate bipolar transistor (IGBT) sub-modules to obtain an initial IGBT module structure model, which includes ports.

[0085] Step Sa22: Simulate the impedance of the port of the initial insulated gate bipolar transistor module structure model to obtain the second simulation result, which includes the simulated impedance of the port.

[0086] Step Sa23: Match the simulated impedance with the preset impedance range to obtain the matching result.

[0087] Step Sa24: In response to the matching result indicating that the simulated impedance is not within the preset impedance range, the initial structural model is optimized based on the simulated impedance to obtain the structural model of the insulated gate bipolar transistor module.

[0088] Specifically, firstly, multiple insulated-gate bipolar transistor (IGBT) sub-modules are modeled and combined to obtain the initial structural model of the IGBT module. This initial structural model includes ports used to receive input from the IGBT module. After obtaining the initial structural model, the impedance of the ports is simulated to obtain a second simulation result including the simulated impedance of the ports. Then, the simulated impedance is matched against a preset impedance range to obtain a matching result. If the matching result shows that the simulated impedance is not within the preset impedance range, the error between the simulated impedance and the measured impedance exceeds the preset acceptable range. Therefore, the initial structural model corresponding to the IGBT module needs to be optimized to obtain the IGBT module structural model.

[0089] It should be noted that the port impedance is the concentrated manifestation of the distributed parameters of the structure at the port. Therefore, the accuracy of the model can be corrected by matching the simulated impedance with the preset impedance range. It should also be noted that optimizing the initial model involves continuously adjusting the initial structural model and monitoring the matching between the simulated impedance and the preset impedance range until the simulated impedance is within the preset impedance range, at which point optimization stops, resulting in the insulated gate bipolar transistor (IGBT) module structure model.

[0090] It should be noted that optimizing the initial structural model includes adjusting the dielectric parameters between the conductor and the metal shell inside the initial structural model, such as the relative permittivity and thickness.

[0091] It should be noted that if the simulation impedance of the initial structural model is within the preset impedance range, there is no need to optimize the initial structural model; the initial structural model can be directly used as the structural model of the insulated gate bipolar transistor module.

[0092] Reference Figure 2 A flowchart of the insulated gate bipolar transistor module modeling according to one embodiment of the present invention is shown below. Figure 1 As shown, the process of constructing an accurate EMC (Electromagnetic Compatibility) structural model (Insulated Gate Bipolar Transistor module structural model) includes: First, the IGBT module is decomposed into multiple IGBT sub-modules. The measurement of the IGBT module involves measuring the impedance of the IGBT module ports. After the IGBT module is decomposed and measured, an IGBT structural model is constructed based on the decomposition results. After obtaining the IGBT structural model, impedance simulation is performed on the ports of the IGBT structural model to obtain the simulated impedance of the ports. After obtaining the simulated impedance of the ports, it is determined whether the error between the simulated impedance and the measured port impedance is within an acceptable error range. If the error between the simulated impedance and the measured port impedance is within an acceptable error range, the accurate EMC structural model (Insulated Gate Bipolar Transistor module structural model) is directly obtained. If the error between the simulated impedance and the measured port impedance is not within an acceptable error range, the IGBT structural model is optimized until the error between the simulated impedance and the measured port impedance is within an acceptable error range, at which point the optimization stops. The specific optimization method has been described above and will not be elaborated further in this embodiment.

[0093] It is understandable that optimizing the initial structural model after structural modeling the IGBT module can make the final IGBT module corresponding to the insulated gate bipolar transistor module structural model more accurate.

[0094] Optionally, in step S102, constructing the circuit simulation model of the electric drive system and the test bench based on the structural model may include the following steps:

[0095] Step S1021: Based on the structural model, determine the equivalent circuit parameters of each structure in the structural model.

[0096] Step S1022: Construct a circuit model based on the actual circuit of the electric drive system and the actual circuit of the test bench.

[0097] Step S1023: Determine the circuit simulation model based on the equivalent circuit parameters and the circuit model.

[0098] Specifically, in the structural model constructed in step S101, each structure carries the equivalent circuit parameters corresponding to that structure. First, the equivalent circuit parameters of each hardware structure are determined from the model obtained by modeling. Then, the equivalent circuit parameters are integrated into the actual circuit model constructed based on the actual circuit of the electric drive system and the test bench. The circuit model with the equivalent circuit parameters of each structure is the circuit simulation model.

[0099] For example, refer to Figure 3 , Figure 3 This is a schematic diagram of a circuit simulation model according to one embodiment of the present invention, such as... Figure 3 As shown, the circuit simulation model includes: a DC power supply, cables, a positive line impedance stabilization network (LISN), a negative line impedance stabilization network, a DC bus capacitor, a control board, a driver board, a three-phase bridge circuit (IGBT module), parasitic parameters (equivalent circuit parameters) of the structural model, and the equivalent load of the motor. The DC power supply is connected sequentially to the positive line impedance stabilization network (LISN), the negative line impedance stabilization network, the DC bus capacitor, the three-phase bridge circuit (IGBT module), the parasitic parameters (equivalent circuit parameters) of the structural model, and the equivalent load of the motor via cables. The control board is connected to the driver board, and the driver board is connected to the IGBT module.

[0100] Optionally, radiated emission simulation methods for electric drive systems also include:

[0101] Step S106: Compare the radiated emission simulation results with the preset standard to obtain the comparison results.

[0102] Step S107: Optimize the spatial model based on the comparison results.

[0103] Specifically, after obtaining the radiated emission simulation results by performing radiated emission simulation on the space model, the space model can be optimized based on the comparison results with the preset standards. In turn, the electric drive system can be optimized so that the electromagnetic compatibility of the electric drive system reaches the most suitable level.

[0104] It should be noted that the preset standard is an international standard.

[0105] For example, optimizing the spatial model can involve adding conductive sealant to the spatial model. Using conductive sealant can enhance the shielding effect of the inverter housing while providing good conductivity.

[0106] Reference Figure 7 and Figure 8 , Figure 7This is a schematic diagram of the third simulation result according to one embodiment of the present invention. Figure 8 This is a schematic diagram of the fourth simulation result according to one embodiment of the present invention. It should be noted that... Figure 7 This is the electromagnetic leakage simulation result when the conductive sealant is not included in the spatial model, i.e., the third simulation result. Figure 8 This is the electromagnetic leakage simulation result when conductive sealant is included in the spatial model, i.e., the fourth simulation result. (Comparison) Figure 7 and Figure 8 It can be seen that adding conductive sealant to the space model significantly reduces the magnetic field strength around the electric drive system, effectively preventing electromagnetic leakage. A lower magnetic field strength around the electric drive system means less electromagnetic interference from its radiated emissions.

[0107] For example, optimizing the spatial model can involve arranging the high-voltage and low-voltage lines entering and exiting the inverter housing on different sides, increasing the distance between the high-voltage and low-voltage lines, ensuring the isolation between the high-voltage and low-voltage lines, and preventing interference signals carried by the high-voltage end from coupling to the low-voltage end.

[0108] Reference Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the fifth simulation result according to one embodiment of the present invention. Figure 10 This is a schematic diagram of the sixth simulation result according to one embodiment of the present invention. Figure 9 and Figure 10 The horizontal axis represents the radiated emission frequency, and the vertical axis represents the voltage across the line impedance stabilization network in the spatial model. The highlighted horizontal lines in the table represent the voltage thresholds corresponding to international standards. It should be noted that... Figure 9 and Figure 10 These are simulation results of the space model using two different structural designs. The different structural designs refer to the different arrangements of the high-voltage and low-voltage lines. (Refer to...) Figure 9 and Figure 10 As can be seen, after optimizing the inverter design, the radiated emission simulation results show that, at most frequencies, the voltage across the line impedance stabilization network is much lower than the voltage threshold corresponding to the international standard, indicating that the optimization method is effective.

[0109] It is important to note that when optimizing the spatial model, it is not a matter of simply adding more optimization designs. Instead, it is necessary to comprehensively consider voltage values ​​and cost factors, continuously iterate and optimize the spatial model, and determine the most suitable optimization scheme for the current electric drive system.

[0110] Reference Figure 11 This is a schematic flowchart of a radiated emission simulation method for an electric drive system according to one embodiment of the present invention, as shown below. Figure 11As shown, in some embodiments of the present invention, the radiated emission simulation method for an electric drive system is executed as follows:

[0111] First, structural modeling of the IGBT module is performed to obtain the IGBT module structural model. Then, based on the IGBT module structural model, the electric drive system and test bench are modeled. When structurally modeling the electric drive system and test bench, they must be treated as a whole to obtain an overall structural model. After obtaining the overall structural model, the IGBT module structural model is simulated to obtain the simulated impedance of the IGBT module. The error between the simulated port impedance and the measured port impedance is determined to be within the allowable range. If the error is not within the allowable range, the IGBT module structural model needs to be optimized, iterating through the aforementioned steps. If the error is within the allowable range, circuit simulation models of the drive system and test bench are constructed based on the actual circuit topology of the test bench. After obtaining the circuit simulation model, the aforementioned structural model is converted into an SML model file and imported into the circuit model to obtain the circuit simulation model. The SML model file is a file format that can be imported into the circuit model. After obtaining the circuit simulation model, conducted emission simulation is performed on the circuit simulation model to obtain the conducted emission simulation results. The conducted emission simulation results are then used to back-engineer the structural model to obtain the spatial model. Radiated emission simulation is then performed on the spatial model to obtain the radiated emission simulation results. The space model was then verified and optimized using radiated emission simulation results. After multiple iterations of optimization, the optimal EMC design scheme for the electric drive system was determined.

[0112] It is important to note that Figure 11 The details of some of the steps have been described above and will not be repeated here.

[0113] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0114] This embodiment also provides a radiation emission simulation device for an electric drive system, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0115] Figure 12 This is a structural block diagram of a radiation emission simulation device 200 for an electric drive system according to one embodiment of the present invention, as shown below. Figure 12 As shown, an example is a radiated emission simulation device 200 for an electric drive system. This device includes: a first construction module 201, used to construct a structural model of the hardware structure of the vehicle's electric drive system and the test bench associated with the electric drive system; a second construction module 202, used to construct a circuit simulation model of the electric drive system and the test bench based on the structural model; a first simulation module 203, used to perform conducted emission simulation on the circuit simulation model to obtain a first simulation result; a third construction module 204, used to use a preset port to back-engineer the first simulation result into the structural model for updating, obtaining a spatial model; and a second simulation module 205, used to perform radiated emission simulation on the updated spatial model to obtain radiated emission simulation results.

[0116] Optionally, the electric drive system includes a motor and an inverter; the first building module 201 is also used to: perform structural modeling of the hardware structure of the motor and inverter to obtain a first sub-model; perform structural modeling of the hardware structure of the test bench to obtain a second sub-model; and determine the structural model based on the first sub-model and the second sub-model.

[0117] Optionally, the inverter includes an inverter housing, capacitor busbars, a drive board, a control board, and an insulated gate bipolar transistor (IGBT) module; the first building module 201 is further configured to: perform structural modeling on the inverter housing, capacitor busbars, drive board, control board, and IGBT module respectively and combine them to obtain an inverter structural model; perform structural modeling on the motor to obtain a motor structural model; and determine a first sub-model based on the inverter structural model and the motor structural model.

[0118] Optionally, the first building module 201 is further configured to: decompose the insulated gate bipolar transistor (IGBT) module to obtain multiple IGBT sub-modules; model and combine the multiple IGBT sub-modules to obtain an IGBT module structural model, wherein the IGBT module structural model is used to determine the inverter structural model.

[0119] Optionally, the first building module 201 is further configured to: model and combine multiple insulated-gate bipolar transistor (IGBT) sub-modules to obtain an initial IGBT module structure model, the initial IGBT module structure model including ports; simulate the impedance of the ports of the initial IGBT module structure model to obtain a second simulation result, wherein the second simulation result includes the simulated impedance of the ports; match the simulated impedance with a preset impedance range to obtain a matching result; and, in response to the matching result indicating that the simulated impedance is not within the preset impedance range, optimize the initial structure model based on the simulated impedance to obtain an IGBT module structure model.

[0120] Optionally, the second building module 202 is also used to: determine the equivalent circuit parameters of each structure in the structural model based on the structural model; construct a circuit model based on the actual circuit of the electric drive system and the actual circuit of the test bench; and determine the circuit simulation model based on the equivalent circuit parameters and the circuit model.

[0121] Optionally, the radiation emission simulation device 200 for the electric drive system also includes an optimization module, which is connected to the second simulation module 205. The optimization module is used for the radiation emission simulation method of the electric drive system, which further includes: comparing the radiation emission simulation results with a preset standard to obtain comparison results; and optimizing the spatial model based on the comparison results.

[0122] Embodiments of the present invention also provide an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to execute the radiated emission simulation method of the electric drive system described in any of the above embodiments.

[0123] Optionally, in this embodiment, the processor in the above-described electronic device may be configured to run a computer program to perform the following steps:

[0124] Step S101: Construct a structural model of the vehicle's electric drive system and the hardware structure of the test bench associated with the electric drive system.

[0125] Step S102: Based on the structural model, construct the circuit simulation model of the electric drive system and the test bench.

[0126] Step S103: Perform conduction-emission simulation on the circuit simulation model to obtain the first simulation result.

[0127] Step S104: Use a preset port to back-engineer the first simulation result back into the structural model for update processing to obtain the spatial model.

[0128] Step S105: Perform radiation emission simulation on the updated space model to obtain radiation emission simulation results.

[0129] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0130] Embodiments of the present invention also provide a non-volatile storage medium storing a computer program, wherein the computer program is configured to execute the steps in the embodiments of the above-described electric drive system radiation emission simulation method when run on a computer or processor.

[0131] Optionally, in this embodiment, the non-volatile storage medium described above can be configured to store a computer program for performing the following steps:

[0132] Step S101: Construct a structural model of the vehicle's electric drive system and the hardware structure of the test bench associated with the electric drive system.

[0133] Step S102: Based on the structural model, construct the circuit simulation model of the electric drive system and the test bench.

[0134] Step S103: Perform conduction-emission simulation on the circuit simulation model to obtain the first simulation result.

[0135] Step S104: Use a preset port to back-engineer the first simulation result back into the structural model for update processing to obtain the spatial model.

[0136] Step S105: Perform radiation emission simulation on the updated space model to obtain radiation emission simulation results.

[0137] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0138] 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.

[0139] In some embodiments provided in this application, 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 instance, 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 may be through some interfaces; the indirect coupling or communication connection of units or modules may be electrical or other forms.

[0140] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, 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 according to actual needs.

[0141] 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.

[0142] 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.

[0143] 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 method for simulating radiated emissions from an electric drive system, characterized in that, include: A structural model of the hardware structure of the vehicle's electric drive system and the test bench associated with the electric drive system is constructed, wherein the electric drive system and the test bench are treated as a whole during the entire simulation process; Based on the structural model, determine the equivalent circuit parameters of each structure in the structural model; A circuit model is constructed based on the actual circuit of the electric drive system and the test bench. Based on the equivalent circuit parameters and the circuit model, a circuit simulation model of the electric drive system and the test bench is constructed. The circuit simulation model includes: a DC power supply, cables, a positive line impedance stabilization network, a negative line impedance stabilization network, a DC bus capacitor, a control board, a drive board, a three-phase bridge circuit, the equivalent circuit parameters, and a motor equivalent load. The DC power supply is connected to the positive line impedance stabilization network, the negative line impedance stabilization network, the DC bus capacitor, the three-phase bridge circuit, the equivalent circuit parameters, and the motor equivalent load in sequence through the cables. The control board is connected to the drive board, and the drive board is connected to the three-phase bridge circuit. Conducted emission simulation was performed on the circuit simulation model to obtain the first simulation result; The first simulation result is back-engineered into the structural model using a preset port for updating, thus obtaining the spatial model. The updated space model is subjected to radiative emission simulation to obtain radiative emission simulation results; The radiated emission simulation results are compared with a preset standard to obtain the comparison results; The spatial model is optimized based on the comparison results. The optimization of the spatial model includes: adding conductive sealant to the spatial model and arranging the high-voltage lines and low-voltage lines entering and exiting the inverter housing on different sides.

2. The radiated emission simulation method for an electric drive system according to claim 1, characterized in that, The electric drive system includes a motor and an inverter; The structural model for constructing the hardware structure of the vehicle's electric drive system and the test bench associated with the electric drive system includes: The hardware structure of the motor and the inverter is structurally modeled to obtain the first sub-model; The hardware structure of the test bench is structurally modeled to obtain the second sub-model; The structural model is determined based on the first sub-model and the second sub-model.

3. The radiated emission simulation method for an electric drive system according to claim 2, characterized in that, The inverter includes an inverter housing, capacitor busbars, a drive board, a control board, and an insulated gate bipolar transistor module. The structural modeling of the hardware structure of the motor and the inverter to obtain the first sub-model includes: The inverter housing, the capacitor busbar, the drive board, the control board, and the insulated gate bipolar transistor module are structurally modeled and combined to obtain the inverter structural model; The motor is structurally modeled to obtain a motor structural model; The first sub-model is determined based on the inverter structural model and the motor structural model.

4. The radiated emission simulation method for an electric drive system according to claim 3, characterized in that, Structural modeling of the insulated gate bipolar transistor module includes: The insulated gate bipolar transistor module is decomposed to obtain multiple insulated gate bipolar transistor sub-modules; The insulated gate bipolar transistor (IGBT) sub-modules are modeled and combined to obtain an IGBT module structural model, wherein the IGBT module structural model is used to determine the inverter structural model.

5. The radiated emission simulation method for an electric drive system according to claim 4, characterized in that, The process of modeling and combining the multiple insulated-gate bipolar transistor (IGBT) sub-modules to obtain the IGBT module structural model includes: The multiple insulated gate bipolar transistor (IGBT) sub-modules are modeled and combined to obtain an initial IGBT module structure model, which includes ports. The impedance of the port of the initial insulated gate bipolar transistor module structure model is simulated to obtain a second simulation result, wherein the second simulation result includes the simulated impedance of the port; The simulated impedance is matched with a preset impedance range to obtain a matching result; In response to the matching result indicating that the simulated impedance is not within the preset impedance range, the initial structural model is optimized based on the simulated impedance to obtain the structural model of the insulated gate bipolar transistor module.

6. A radiation emission simulation device for an electric drive system, characterized in that, include: The first construction module is used to construct a structural model of the hardware structure of the vehicle's electric drive system and the test bench associated with the electric drive system, wherein the electric drive system and the test bench are considered as a whole during the entire simulation process. The second construction module is used to determine the equivalent circuit parameters of each structure in the structural model based on the structural model; construct a circuit model according to the actual circuit of the electric drive system and the test bench; and construct a circuit simulation model of the electric drive system and the test bench according to the equivalent circuit parameters and the circuit model. The circuit simulation model includes: a DC power supply, cables, a positive line impedance stabilization network, a negative line impedance stabilization network, a DC bus capacitor, a control board, a drive board, a three-phase bridge circuit, the equivalent circuit parameters, and a motor equivalent load. The DC power supply is connected to the positive line impedance stabilization network, the negative line impedance stabilization network, the DC bus capacitor, the three-phase bridge circuit, the equivalent circuit parameters, and the motor equivalent load in sequence through the cables. The control board is connected to the drive board, and the drive board is connected to the three-phase bridge circuit. A first simulation module is used to perform conduction-emission simulation on the circuit simulation model to obtain a first simulation result. The third construction module is used to use a preset port to back-engineer the first simulation result back to the structural model for update processing, so as to obtain a spatial model; The second simulation module is used to perform radiation emission simulation on the updated space model to obtain radiation emission simulation results. The device is also used to compare the radiated emission simulation results with a preset standard to obtain a comparison result; and to optimize the spatial model based on the comparison result, wherein the optimization of the spatial model includes: adding conductive sealant to the spatial model and arranging the high-voltage lines and low-voltage lines entering and exiting the inverter housing on different sides.

7. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to perform the radiation emission simulation method for the electric drive system as described in any one of claims 1 to 5.

8. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores a computer program, wherein the computer program is configured to execute the radiated emission simulation method of the electric drive system as described in any one of claims 1 to 5 when run on a computer or processor.

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