A simulation analysis method and system for electric vehicle charging conduction

Abstract

The present invention provides a simulation analysis method and system for charging conduction of electric vehicles, including step S1, associating a pre-established on-board charger model, charging gun model and charging cable model with a target vehicle model to obtain a charging conduction simulation circuit model of the target vehicle; step S2, performing a charging conduction simulation test according to the charging conduction simulation circuit model to obtain a simulation result; comparing the simulation result with the peak limit of the test to generate a comparison result; step S3, outputting a charging conduction circuit scheme for the target vehicle according to the comparison result; or adjusting the parameters of the charging conduction simulation circuit model and performing a simulation test until the adjusted simulation result does not exceed the peak limit, and outputting the charging conduction circuit scheme for the target vehicle. The present invention realizes the prediction and evaluation of the electromagnetic compatibility performance of charging conduction of the entire electric vehicle, and also needs to verify the results in a darkroom, saving expenses and improving rectification efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of charging conduction of new energy electric vehicles, and in particular to a simulation analysis method and system for charging conduction of electric vehicles. Background Art

[0002] Electric vehicle charging is divided into fast charging and slow charging. Slow charging is to connect the 220V mains power through the charging gun, and then convert the 220V AC into 300V-500V DC through the on-board charger to charge the power battery. It can be charged as long as it is connected to an ordinary household socket. It is a very convenient charging method. Slow charging directly connects to the mains network to obtain electricity. Electromagnetic compatibility performance is one of the important performance indicators. Among them, charging conduction is particularly important. If the conduction interference is too large, it will affect the power quality of the entire power grid and even interfere with the normal operation of other electrical appliances. At present, the charging conduction of electric vehicles is completed by connecting the electric vehicle to the mains power through the charging gun and conducting actual measurements in the charging state. When the charging conduction of the whole vehicle does not meet the national standard requirements, it is necessary to repeatedly modify the charging gun and the on-board charger separately, adjust the device parameters of multiple circuits of the two devices, and even modify the circuit structure, and then test the charging gun and the on-board charger separately and two cascade tests. After meeting the national standard requirements of the components and the whole vehicle, the rectification of the charging conduction of the whole vehicle is completed.

[0003] However, in the test process summary, it is often found that the conducted emissions can meet the standard requirements when the charging gun and the on-board charger are tested separately, but cannot meet the standard requirements when the whole vehicle charging conduction is tested (that is, after the charging gun and the on-board charger are cascaded). In the process of rectifying the electromagnetic compatibility performance of the whole vehicle charging conduction, the design engineers can neither determine whether it is more effective to modify the charging gun or the on-board charger, nor can they determine the margin space for rectifying the equipment.

[0004] Usually, charging guns and on-board chargers are produced by different manufacturers. When electric vehicles undergo vehicle charging conduction testing and rectification, technical engineers from each component factory are required to participate in the whole process and conduct on-site rectification at a third-party testing agency. If rectification cannot be carried out on-site, the products need to be taken back to the manufacturer for modification. After the rectification is completed, the whole vehicle will be tested and verified at the testing agency. Multiple rectifications and repeated testing will waste a lot of time, manpower and material resources. Summary of the invention

[0005] The purpose of the present invention is to propose a simulation analysis method for electric vehicle charging conduction, so as to solve the technical problem that the existing method can only be carried out through real vehicle testing and rectification, and cannot accurately determine the rectification components.

[0006] On the one hand, a simulation analysis method for electric vehicle charging conduction is provided, comprising the following steps:

[0007] Step S1, selecting a target vehicle body model from a pre-established vehicle body model library, associating a pre-established on-board charger model, a charging gun model and a charging cable model with the target vehicle body model, and obtaining a charging conduction simulation circuit model of the target vehicle body;

[0008] Step S2, performing a charging conduction simulation test according to the charging conduction simulation circuit model to obtain a simulation result; comparing the simulation result with the peak limit of the test to generate a comparison result;

[0009] Step S3: output the charging conduction simulation circuit model of the target vehicle body as the charging conduction circuit scheme of the target vehicle body according to the comparison result; or adjust the parameters of the charging conduction simulation circuit model and perform simulation test until the adjusted simulation result does not exceed the peak limit, and then output the adjusted charging conduction simulation circuit model as the charging conduction circuit scheme of the target vehicle body.

[0010] Preferably, in step S1, the specific process of establishing the pre-established on-board charger model is as follows:

[0011] Obtain parameter data of the on-board charger, convert the parameter data of the on-board charger into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the on-board charger EMI filter circuit according to the three-dimensional digital model, build a corresponding active circuit model according to the circuit diagram, integrate the three-dimensional finite element model of the on-board charger EMI filter circuit and the active circuit model, and output the on-board charger model.

[0012] Preferably, in step S1, the specific process of establishing the pre-established charging gun model is:

[0013] Acquire parameter data of the charging gun, convert the parameter data of the charging gun into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the main power circuit of the charging gun according to the three-dimensional digital model, build a corresponding auxiliary circuit model according to the circuit diagram, and output the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model to the charging gun model.

[0014] Preferably, in step S1, the specific process of establishing the pre-established charging cable model is:

[0015] Obtain the parameter data of the charging gun, as well as the conductor cross-sectional area, insulation layer thickness, insulation layer material, cable length and cable twisting method of the long cable of the charging gun, perform three-dimensional electromagnetic field finite element modeling on the long cable, and output the three-dimensional finite element model of the charging cable.

[0016] Preferably, in step S2, comparing the simulation result with the peak limit of the test specifically includes:

[0017] By querying the ECE R10 unified certification parameters, the peak limit values ​​of each electromagnetic parameter in the charging conduction test are obtained;

[0018] Each electromagnetic parameter in the simulation result is compared with the corresponding peak limit value to generate a comparison result, wherein the comparison result includes exceeding the peak limit value or not exceeding the peak limit value.

[0019] Preferably, the step S3 specifically includes:

[0020] When the comparison result is that the peak value limit is not exceeded, the charging conduction simulation circuit model of the target vehicle body is output as a charging conduction circuit scheme of the target vehicle body;

[0021] When the comparison result exceeds the peak limit, the parameters of the on-board charger model or the charging gun model are adjusted to obtain an adjusted charging conduction simulation circuit model, and charging conduction simulation is performed according to the adjusted charging conduction simulation circuit model to obtain an adjusted simulation result; the adjusted simulation result is compared with the peak limit of the test to generate an adjusted comparison result; until the adjusted comparison result does not exceed the peak limit, the adjusted charging conduction simulation circuit model is output as a charging conduction circuit solution for the target vehicle body.

[0022] On the other hand, a simulation analysis system for electric vehicle charging conduction is also provided to implement the method, including:

[0023] A model building module is used to select a target vehicle body model from a pre-established vehicle body model library, associate a pre-established on-board charger model, a charging gun model and a charging cable model with the target vehicle body model, and obtain a charging conduction simulation circuit model of the target vehicle body;

[0024] The simulation test module is used to perform a charging conduction simulation test according to the charging conduction simulation circuit model to obtain a simulation result; compare the simulation result with the peak limit of the test to generate a comparison result; output the charging conduction simulation circuit model of the target vehicle body as a charging conduction circuit scheme of the target vehicle body according to the comparison result; or adjust the parameters of the charging conduction simulation circuit model and perform a simulation test until the adjusted simulation result does not exceed the peak limit, and then output the adjusted charging conduction simulation circuit model as the charging conduction circuit scheme of the target vehicle body.

[0025] Preferably, the model building module is also used to obtain parameter data of the on-board charger, convert the parameter data of the on-board charger into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the on-board charger EMI filter circuit according to the three-dimensional digital model, build a corresponding active circuit model according to the circuit diagram, integrate the three-dimensional finite element model of the on-board charger EMI filter circuit and the active circuit model, and output the on-board charger model;

[0026] Obtain parameter data of the charging gun, convert the parameter data of the charging gun into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the main power circuit of the charging gun according to the three-dimensional digital model, build a corresponding auxiliary circuit model according to the circuit diagram, and output the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model to the charging gun model;

[0027] Obtain the parameter data of the charging gun, as well as the conductor cross-sectional area, insulation layer thickness, insulation layer material, cable length and cable twisting method of the long cable of the charging gun, perform three-dimensional electromagnetic field finite element modeling on the long cable, and output the three-dimensional finite element model of the charging cable.

[0028] Preferably, the simulation test module is further used to obtain the peak limit value of each electromagnetic parameter in the charging conduction test by querying the ECE R10 unified certification parameters;

[0029] Each electromagnetic parameter in the simulation result is compared with the corresponding peak limit value to generate a comparison result, wherein the comparison result includes exceeding the peak limit value or not exceeding the peak limit value.

[0030] Preferably, the simulation test module is further used to generate a charging conduction simulation circuit model of the target vehicle body as a charging conduction circuit scheme of the target vehicle body when the comparison result is that the peak value limit is not exceeded;

[0031] When the comparison result exceeds the peak limit, the parameters of the on-board charger model or the charging gun model are adjusted to obtain an adjusted charging conduction simulation circuit model, and charging conduction simulation is performed according to the adjusted charging conduction simulation circuit model to obtain an adjusted simulation result; the adjusted simulation result is compared with the peak limit of the test to generate an adjusted comparison result; until the adjusted comparison result does not exceed the peak limit, the adjusted charging conduction simulation circuit model is output as a charging conduction circuit solution for the target vehicle body.

[0032] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0033] The simulation analysis method and system of electric vehicle charging conduction provided by the present invention realizes the prediction and evaluation of the electromagnetic compatibility performance of the charging conduction of the whole electric vehicle by building a simulation model equivalent to the charging conduction test of the whole electric vehicle, and a field-circuit collaborative simulation model of the charger and the on-board charging gun cascade. It not only has a good match with the actual measurement in terms of trend, but also has a good match in terms of magnitude. After completing the construction of the simulation circuit, confirm that the simulation circuits of the on-board charger and the charging gun are working normally. Subsequent parameter scanning, accompanying derivation, and circuit modification work do not require the equipment manufacturer to operate on site, nor do they need to verify the results in a darkroom, saving expenses and improving rectification efficiency.

[0034] Through the three-dimensional electromagnetic field and circuit collaborative modeling of the charging gun and the on-board charger, the simulation analysis of the mismatch between the charging gun and the on-board charger is realized, and the three-dimensional digital model of all the cables of the charging gun and the three-dimensional digital model of the whole vehicle body as the real noise return path are creatively added, taking into account most of the factors affecting the charging conduction performance of the electric vehicle, so that the simulation results are closer to the actual measurement at the peak point. Modifying the devices in the vehicle charging conduction field-path collaborative simulation circuit, adding / deleting devices or circuit structures, can easily view the impact on the results before and after the modification, and can also perform parameter scanning and accompanying derivatives on one or several device parameters to determine the degree of impact of the change on the results. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0036] Figure 1 It is a schematic diagram of the main process of a simulation analysis method for electric vehicle charging conduction in an embodiment of the present invention.

[0037] Figure 2 It is a logic schematic diagram of a simulation analysis method for charging conduction of an electric vehicle in an embodiment of the present invention.

[0038] Figure 3 It is a schematic diagram of a simulation analysis system for electric vehicle charging conduction in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] like Figure 1 and Figure 2 FIG. 1 is a schematic diagram of an embodiment of a simulation analysis method for charging conduction of an electric vehicle provided by the present invention. In this embodiment, the method includes the following steps:

[0041] Step S1, select the target body model from the pre-established vehicle body model library, associate the pre-established on-board charger model, charging gun model and charging cable model with the target body model, and obtain the charging conduction simulation circuit model of the target body; it can be understood that this process is to build a simulation model equivalent to the charging conduction test of the whole electric vehicle, specifically to establish a field-circuit collaborative simulation model of the charger and the on-board charging gun in cascade, without the need for actual vehicle measurement, and realize the simulation analysis of the mismatch between the charging gun and the on-board charger. The on-board charger, charging gun and cable models are further cascaded to form a complete electric vehicle charging conduction simulation circuit model, in preparation for subsequent simulation calculations. At the same time, the three-dimensional digital model of all cables of the charging gun and the three-dimensional digital model of the whole vehicle body of the actual conduction noise return path are also added, taking into account most of the influencing factors affecting the charging conduction performance of the whole electric vehicle, not only in the trend of the electromagnetic compatibility characteristics of the charging conduction of the whole electric vehicle is well consistent with the actual measurement, but also in the magnitude and even the peak position.

[0042] In a specific embodiment, the specific process of establishing the pre-established on-board charger model is as follows: obtaining the parameter data of the on-board charger, converting the parameter data of the on-board charger into a three-dimensional digital model and a circuit diagram, building a corresponding three-dimensional finite element model of the on-board charger EMI (electro magnetic interference) filter circuit according to the three-dimensional digital model, building a corresponding active circuit model according to the circuit diagram, integrating the three-dimensional finite element model of the on-board charger EMI filter circuit and the active circuit model, and outputting the on-board charger model. The specific process of establishing the pre-established charging gun model is as follows: obtaining the parameter data of the charging gun, converting the parameter data of the charging gun into a three-dimensional digital model and a circuit diagram, building a corresponding three-dimensional finite element model of the main power circuit of the charging gun according to the three-dimensional digital model, building a corresponding auxiliary circuit model according to the circuit diagram, integrating the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model, and outputting the charging gun model. It is understandable that the three-dimensional electromagnetic field finite element model of the on-board charger EMI filter circuit and active circuit models such as the PFC (Power Factor Correction) circuit are built based on the detailed three-dimensional electromagnetic field digital model and circuit diagram of the PCB (Printed Circuit Board) and magnetic core inductor provided by the manufacturers of the on-board charger and charging gun. At the same time, the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model are established.

[0043] More specifically, the specific process of establishing the pre-established charging cable model is: obtaining the parameter data of the charging gun, as well as the conductor cross-sectional area, insulation layer thickness, insulation layer material, cable length and cable twisting method of the long cable of the charging gun, performing three-dimensional electromagnetic field finite element modeling on the long cable, and outputting a three-dimensional finite element model of the charging cable. It can be understood that according to the conductor cross-sectional area, insulation layer thickness, insulation layer material, cable length and cable twisting method in the specification of the long cable, a detailed three-dimensional electromagnetic field finite element model of each cable is built.

[0044] Step S2, perform charging conduction simulation test according to the charging conduction simulation circuit model to obtain simulation results; during the simulation test, set the vehicle charging conduction emission focus frequency band to 150kHz-108MHz, simulate and calculate the field-road cooperative circuit, the simulation time must be greater than 6.7uS, and the time interval must be less than 9nS. Compare the simulation results with the peak limit of the test to generate a comparison result; it can be understood that the comparison process specifically includes: by querying the ECE (Economic Commission of Europe) R10 standard for electromagnetic compatibility of on-board electronic and electrical products, obtain the peak limit of each electromagnetic parameter in the charging conduction test; compare each electromagnetic parameter in the simulation result with the corresponding peak limit to generate a comparison result, which can directly predict the electromagnetic compatibility performance of the electric vehicle charging conduction, wherein the comparison result includes exceeding the peak limit or not exceeding the peak limit.

[0045] Step S3, according to the comparison result, the charging conduction simulation circuit model of the target vehicle body is output as the charging conduction circuit scheme of the target vehicle body; or the parameters of the charging conduction simulation circuit model are adjusted and simulated and tested, until the adjusted simulation result does not exceed the peak limit, the adjusted charging conduction simulation circuit model is output as the charging conduction circuit scheme of the target vehicle body. It can be understood that different processing methods are adopted according to the comparison results. For example, when the result exceeds the threshold, the parameters of the EMI filter circuit of the on-board charger and the auxiliary circuit parameters of the charging gun are scanned or derived, which can accurately predict the improvement of the charging conduction results caused by these parameter adjustments, and can also perform sensitivity analysis of the parameters to the results, providing an effective solution for rectification.

[0046] In a specific embodiment, when the comparison result is that the peak value limit is not exceeded, the charging conduction simulation circuit model of the target vehicle body is output as a charging conduction circuit scheme of the target vehicle body;

[0047] When the comparison result exceeds the peak limit, the parameters of the on-board charger model or the charging gun model are adjusted to obtain an adjusted charging conduction simulation circuit model, and charging conduction simulation is performed according to the adjusted charging conduction simulation circuit model to obtain an adjusted simulation result; the adjusted simulation result is compared with the peak limit of the test to generate an adjusted comparison result; until the adjusted comparison result does not exceed the peak limit, the adjusted charging conduction simulation circuit model is output as the charging conduction circuit scheme of the target vehicle body. It can be understood that when the simulation result exceeds the peak limit, the parameters in the model need to be adjusted, and the adjustment is re-evaluated until the peak limit is met. By performing parameter scanning and accompanying derivation of the device parameters in each circuit of the charging gun and the on-board charger, the degree of influence of the parameter change on the result can be obtained, which helps to quickly determine more effective rectification measures.

[0048] like Figure 3 As shown, an embodiment of the present invention further provides a simulation analysis system for electric vehicle charging conduction, which is used to implement the simulation analysis method for electric vehicle charging conduction, including:

[0049] The model building module is used to select the target body model from the pre-established vehicle body model library, associate the pre-established on-board charger model, charging gun model and charging cable model with the target body model, and obtain the charging conduction simulation circuit model of the target body; it can be understood that this process is to build a simulation model equivalent to the charging conduction test of the whole electric vehicle, specifically to establish a field-circuit collaborative simulation model of the charger and the on-board charging gun in cascade, without the need for actual vehicle measurement, and to achieve the simulation analysis of the mismatch between the charging gun and the on-board charger. The on-board charger, charging gun and cable models are further cascaded to form a complete electric vehicle charging conduction simulation circuit model to prepare for subsequent simulation calculations. At the same time, the three-dimensional digital model of all cables of the charging gun and the three-dimensional digital model of the whole vehicle body of the actual conduction noise return path are also added, taking into account most of the influencing factors affecting the charging conduction performance of the whole electric vehicle, not only in the trend of the electromagnetic compatibility characteristics of the charging conduction of the whole electric vehicle is well consistent with the actual measurement, but also in the magnitude and even the peak position.

[0050] In a specific embodiment, the parameter data of the on-board charger is obtained, the parameter data of the on-board charger is converted into a three-dimensional digital model and a circuit diagram, a three-dimensional finite element model of the corresponding on-board charger EMI (electro magnetic interference) filter circuit is built according to the three-dimensional digital model, a corresponding active circuit model is built according to the circuit diagram, the three-dimensional finite element model of the on-board charger EMI filter circuit and the active circuit model are integrated, and the on-board charger model is output. The specific process of establishing the pre-established charging gun model is: obtaining the parameter data of the charging gun, converting the parameter data of the charging gun into a three-dimensional digital model and a circuit diagram, building a corresponding three-dimensional finite element model of the main power circuit of the charging gun according to the three-dimensional digital model, building a corresponding auxiliary circuit model according to the circuit diagram, integrating the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model, and outputting the charging gun model. It is understandable that the three-dimensional electromagnetic field finite element model of the on-board charger EMI filter circuit and active circuit models such as the PFC (Power Factor Correction) circuit are built based on the detailed three-dimensional electromagnetic field digital model and circuit diagram of the PCB (Printed Circuit Board) and magnetic core inductor provided by the manufacturers of the on-board charger and charging gun. At the same time, the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model are established.

[0051] Obtain the parameter data of the charging gun, as well as the conductor cross-sectional area, insulation layer thickness, insulation layer material, cable length and cable twisting method of the long cable of the charging gun, perform three-dimensional electromagnetic field finite element modeling on the long cable, and output the three-dimensional finite element model of the charging cable. It can be understood that according to the conductor cross-sectional area, insulation layer thickness, insulation layer material, cable length and cable twisting method in the specification of the long cable, a detailed three-dimensional electromagnetic field finite element model of each cable is built.

[0052] The simulation test module is used to perform a charging conduction simulation test according to the charging conduction simulation circuit model to obtain a simulation result; compare the simulation result with the peak limit of the test to generate a comparison result; according to the comparison result, the charging conduction simulation circuit model of the target vehicle body outputs the charging conduction circuit scheme of the target vehicle body; or adjusts the parameters of the charging conduction simulation circuit model and performs a simulation test until the adjusted simulation result does not exceed the peak limit, and then outputs the adjusted charging conduction simulation circuit model as the charging conduction circuit scheme of the target vehicle body. It can be understood that different processing methods are adopted according to the comparison results. For example, when the result exceeds the threshold, the parameters of the EMI filter circuit of the on-board charger and the auxiliary circuit parameters of the charging gun are scanned or derived, which can accurately predict the improvement of the charging conduction results caused by these parameter adjustments, and can also perform sensitivity analysis of the parameters to the results, providing an effective solution for rectification.

[0053] In a specific embodiment, the vehicle charging conduction emission focus frequency band is set to 150kHz-108MHz during the simulation test, and the field-path coordination circuit is simulated and calculated. The simulation time must be greater than 6.7uS, and the time interval must be less than 9nS. The simulation results are compared with the peak limit of the test to generate a comparison result; it can be understood that the comparison process specifically includes: by querying the ECE (Economic Commission of Europe) R10 standard for electromagnetic compatibility of vehicle-mounted electronic and electrical products, the peak limit of each electromagnetic parameter in the charging conduction test is obtained; each electromagnetic parameter in the simulation result is compared with the corresponding peak limit to generate a comparison result, which can directly predict the electromagnetic compatibility performance of the electric vehicle charging conduction, wherein the comparison result includes exceeding the peak limit or not exceeding the peak limit.

[0054] Specifically, when the comparison result is that the peak value limit is not exceeded, the charging conduction simulation circuit model of the target vehicle body is output as a charging conduction circuit scheme of the target vehicle body;

[0055] When the comparison result exceeds the peak limit, the parameters of the on-board charger model or the charging gun model are adjusted to obtain an adjusted charging conduction simulation circuit model, and charging conduction simulation is performed according to the adjusted charging conduction simulation circuit model to obtain an adjusted simulation result; the adjusted simulation result is compared with the peak limit of the test to generate an adjusted comparison result; until the adjusted comparison result does not exceed the peak limit, the adjusted charging conduction simulation circuit model is output as the charging conduction circuit scheme of the target vehicle body. It can be understood that when the simulation result exceeds the peak limit, the parameters in the model need to be adjusted, and the adjustment is re-evaluated until the peak limit is met. By performing parameter scanning and accompanying derivation of the device parameters in each circuit of the charging gun and the on-board charger, the degree of influence of the parameter change on the result can be obtained, which helps to quickly determine more effective rectification measures.

[0056] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0057] The simulation analysis method and system of electric vehicle charging conduction provided by the present invention realizes the prediction and evaluation of the electromagnetic compatibility performance of the charging conduction of the whole electric vehicle by building a simulation model equivalent to the charging conduction test of the whole electric vehicle, and a field-circuit collaborative simulation model of the charger and the on-board charging gun cascade. It not only has a good match with the actual measurement in terms of trend, but also has a good match in terms of magnitude. After completing the construction of the simulation circuit, confirm that the simulation circuits of the on-board charger and the charging gun are working normally. Subsequent parameter scanning, accompanying derivation, and circuit modification work do not require the equipment manufacturer to operate on site, nor do they need to verify the results in a darkroom, saving expenses and improving rectification efficiency.

[0058] Through the three-dimensional electromagnetic field and circuit collaborative modeling of the charging gun and the on-board charger, the simulation analysis of the mismatch between the charging gun and the on-board charger is realized, and the three-dimensional digital model of all the cables of the charging gun and the three-dimensional digital model of the whole vehicle body as the real noise return path are creatively added, taking into account most of the factors affecting the charging conduction performance of the electric vehicle, so that the simulation results are closer to the actual measurement at the peak point. Modifying the devices in the vehicle charging conduction field-path collaborative simulation circuit, adding / deleting devices or circuit structures, can easily view the impact on the results before and after the modification, and can also perform parameter scanning and accompanying derivatives on one or several device parameters to determine the degree of impact of the change on the results.

[0059] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A simulation analysis method for electric vehicle charging conduction, characterized in that: The following steps are involved: Step S1, selecting a target vehicle body model from a pre-established vehicle body model library, associating a pre-established on-board charger model, a charging gun model and a charging cable model with the target vehicle body model, and obtaining a charging conduction simulation circuit model of the target vehicle body; Step S2, performing a charging conduction simulation test according to the charging conduction simulation circuit model to obtain a simulation result; comparing the simulation result with the peak limit of the test to generate a comparison result; Step S3, outputting the charging conduction simulation circuit model of the target vehicle body as a charging conduction circuit scheme of the target vehicle body according to the comparison result; or adjusting the parameters of the charging conduction simulation circuit model and performing simulation test, until the adjusted simulation result does not exceed the peak limit, outputting the adjusted charging conduction simulation circuit model as the charging conduction circuit scheme of the target vehicle body; In step S1, the specific process of establishing the pre-established on-board charger model is as follows: Acquire parameter data of the on-board charger, convert the parameter data of the on-board charger into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the on-board charger EMI filter circuit according to the three-dimensional digital model, build a corresponding active circuit model according to the circuit diagram, integrate the three-dimensional finite element model of the on-board charger EMI filter circuit and the active circuit model, and output the on-board charger model; The specific process of establishing the pre-established charging gun model is as follows: Obtain parameter data of the charging gun, convert the parameter data of the charging gun into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the main power circuit of the charging gun according to the three-dimensional digital model, build a corresponding auxiliary circuit model according to the circuit diagram, and output the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model to the charging gun model; The specific process of establishing the pre-established charging cable model is as follows: Obtain parameter data of the charging gun, as well as the conductor cross-sectional area, insulation thickness, insulation material, cable length, and twisting method of the long cable of the charging gun, perform three-dimensional electromagnetic field finite element modeling on the long cable, and output a three-dimensional finite element model of the charging cable; The step S3 specifically includes: When the comparison result is that the peak value limit is not exceeded, the charging conduction simulation circuit model of the target vehicle body is output as a charging conduction circuit scheme of the target vehicle body; When the comparison result exceeds the peak limit, the parameters of the on-board charger model or the charging gun model are adjusted to obtain an adjusted charging conduction simulation circuit model, and charging conduction simulation is performed according to the adjusted charging conduction simulation circuit model to obtain an adjusted simulation result; the adjusted simulation result is compared with the peak limit of the test to generate an adjusted comparison result; until the adjusted comparison result does not exceed the peak limit, the adjusted charging conduction simulation circuit model is output as a charging conduction circuit solution for the target vehicle body.

2. The method according to claim 1, characterized in that In step S2, comparing the simulation result with the peak limit of the test specifically includes: By querying the ECE R10 unified certification parameters, the peak limit values ​​of each electromagnetic parameter in the charging conduction test are obtained; Each electromagnetic parameter in the simulation result is compared with the corresponding peak limit value to generate a comparison result, wherein the comparison result includes exceeding the peak limit value or not exceeding the peak limit value.

3. A simulation analysis system for electric vehicle charging conduction, used to implement the method according to claim 1 or 2, characterized in that: include: A model building module is used to select a target vehicle body model from a pre-established vehicle body model library, associate a pre-established on-board charger model, a charging gun model and a charging cable model with the target vehicle body model, and obtain a charging conduction simulation circuit model of the target vehicle body; A simulation test module is used to perform a charging conduction simulation test according to the charging conduction simulation circuit model to obtain a simulation result; compare the simulation result with the peak limit of the test to generate a comparison result; output the charging conduction simulation circuit model of the target vehicle body as a charging conduction circuit scheme of the target vehicle body according to the comparison result; or adjust the parameters of the charging conduction simulation circuit model and perform a simulation test until the adjusted simulation result does not exceed the peak limit, and then output the adjusted charging conduction simulation circuit model as the charging conduction circuit scheme of the target vehicle body; The model building module is also used to obtain parameter data of the on-board charger, convert the parameter data of the on-board charger into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the on-board charger EMI filter circuit according to the three-dimensional digital model, build a corresponding active circuit model according to the circuit diagram, integrate the three-dimensional finite element model of the on-board charger EMI filter circuit and the active circuit model, and output the on-board charger model; Obtain parameter data of the charging gun, convert the parameter data of the charging gun into a three-dimensional digital model and a circuit diagram, build a corresponding three-dimensional finite element model of the main power circuit of the charging gun according to the three-dimensional digital model, build a corresponding auxiliary circuit model according to the circuit diagram, and output the three-dimensional finite element model of the main power circuit of the charging gun and the auxiliary circuit model to the charging gun model; Obtain parameter data of the charging gun, as well as the conductor cross-sectional area, insulation thickness, insulation material, cable length, and twisting method of the long cable of the charging gun, perform three-dimensional electromagnetic field finite element modeling on the long cable, and output a three-dimensional finite element model of the charging cable; The simulation test module is further used to generate a charging conduction simulation circuit model of the target vehicle body as a charging conduction circuit scheme of the target vehicle body when the comparison result is that the peak value limit is not exceeded; When the comparison result exceeds the peak limit, the parameters of the on-board charger model or the charging gun model are adjusted to obtain an adjusted charging conduction simulation circuit model, and charging conduction simulation is performed according to the adjusted charging conduction simulation circuit model to obtain an adjusted simulation result; the adjusted simulation result is compared with the peak limit of the test to generate an adjusted comparison result; When the adjusted comparison result does not exceed the peak limit, the adjusted charging conduction simulation circuit model is output as the charging conduction circuit solution of the target vehicle body.

4. The system according to claim 3, characterized in that The simulation test module is also used to obtain the peak limit value of each electromagnetic parameter in the charging conduction test by querying the ECE R10 unified certification parameters; Each electromagnetic parameter in the simulation result is compared with the corresponding peak limit value to generate a comparison result, wherein the comparison result includes exceeding the peak limit value or not exceeding the peak limit value.

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