CN114778979A - Whole vehicle EMC diagnosis method and diagnosis system based on semi-physical simulation - Google Patents
Whole vehicle EMC diagnosis method and diagnosis system based on semi-physical simulation Download PDFInfo
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Abstract
The invention discloses a complete vehicle EMC diagnosis method and system based on semi-physical simulation, wherein the method comprises the following steps: preprocessing a finished automobile and part model and extracting a finished automobile wire harness path; carrying out gridding treatment on the whole vehicle model to obtain a whole vehicle grid model; obtaining common-mode interference current I of a finished automobile wire harness path, port voltage U of each part and equivalent port impedance Z of an interference sourceSAnd equivalent port impedance Z of general partsR(ii) a An antenna model is established at a preset distance of the whole vehicle grid model, I is used as an excitation signal, and a scattering coefficient S and an interference source port equivalent voltage V are calculatedSReceiving a voltage Uant(ii) a Calibrating the receiving antenna to obtain the coefficient AF of the magnetic field antennaHAnd electric field antenna coefficient AFE(ii) a Converting S into Z parameter, combining U, ZS、ZR、VS、Uant、AFHAnd AFEAnd comparing the contribution value of the interference source to the EM I of the whole vehicle, and finding out the overproof parts. The invention has the advantages of low cost, accurate and rapid diagnosis and the like.
Description
Technical Field
The invention mainly relates to the technical field of electromagnetic testing, in particular to a complete vehicle EMC diagnosis method and system based on semi-physical simulation.
Background
At present, a traditional method for checking the EMC problem of the whole automobile by an automobile manufacturer generally comprises the steps of repeatedly testing in an anechoic chamber, carrying out a standard test by closing a part until the EMC characteristic of the whole automobile can meet the national standard or is greatly improved after one or more parts are closed, and further determining the part causing the EMC problem of the whole automobile. The EMC problem troubleshooting method for the whole automobile has the advantages that the required test time and the test site cost are increased rapidly due to the fact that the test needs to be carried out for multiple times, extra expenses of automobile manufacturers are increased greatly, and all automobile parts cannot be eliminated by the EMC problem troubleshooting method.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems in the prior art, the invention provides a complete vehicle EMC diagnosis method and system based on semi-physical simulation, which are low in cost, quick and accurate in diagnosis.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a vehicle EMC diagnosis method based on semi-physical simulation comprises the following steps:
establishing a whole vehicle model and a part model, preprocessing the whole vehicle model and the part model to remove parts which have no influence on EMC analysis, and extracting a wire harness path inside the whole vehicle;
carrying out gridding processing on the preprocessed finished automobile model to obtain a finished automobile grid model;
obtaining common-mode interference current I on a wire harness path inside the whole vehicle, port voltage U of each part and equivalent port impedance Z of an interference source inside the whole vehicleSAnd equivalent port impedance Z of general componentsR；
Simulating a finished automobile grid model and a finished automobile internal wire harness path, establishing an antenna model at a preset distance of the finished automobile grid model, taking common-mode interference current I as an excitation signal, and performing simulation calculation on a scattering coefficient S and an interference source port equivalent voltage VSThe radiation emission condition of the whole vehicle is obtained, and the receiving voltage U on the receiving antenna model is obtainedant(ii) a The receiving antenna comprises a loop antenna model and a monopole antenna model;
calibrating the receiving antenna model to obtain the magnetic field antenna coefficient AF of the loop antenna modelHAnd electric field antenna coefficient AF of monopole antenna modelE；
Converting the scattering coefficient S into a Z parameter, combining the parameters U, ZS、ZR、VS、Uant、AFHAnd AFEAnd decomposing the EMI of the whole vehicle level into superposition of a plurality of interference sources EMI, and further comparing the contribution value of each interference source to the EMI of the whole vehicle to find out the EMI exceeding parts.
Preferably, after obtaining the EMI components exceeding the standard, the EMI components exceeding the standard are tested and verified: and closing the EMI exceeding parts in a darkroom test scene, and then performing EMC test to obtain the radiation emission condition of the whole vehicle to confirm whether the EMI exceeding of the closed parts exists.
Preferably, when the antenna model is established, a loop antenna model and a monopole antenna model are respectively established, the loop antenna is irradiated by using uniform plane waves with preset magnetic field intensity, the magnetic field direction is along the axial direction of the loop antenna, and a receiving resistor is connected to an antenna port; and irradiating the monopole antenna by using uniform plane waves with preset electric field intensity, wherein the direction of an electric field is along the axial direction of the antenna, and a receiving resistor is connected to an antenna port.
Preferably, the voltage U will be receivedantAs an inverse number, thereby obtaining a magnetic field antenna coefficient AF of the loop antenna modelHAnd electric field antenna coefficient AF of monopole antenna modelE。
Preferably, the S parameter is converted to the Z parameter, in combination with the parameter U, ZS、ZR、VS、Uant、AFH、AFEAnd obtaining a prediction formula of low-frequency radiation emission of the whole vehicle, and comparing the contribution value of each interference source to the EMI of the whole vehicle, thereby finding out the parts with the EMI exceeding the standard.
Preferably, the parts in the whole vehicle comprise interference source parts, sensitive source parts and general parts.
Preferably, in step 3), when the common-mode interference current is collected, each pair of positive and negative lines and three-phase lines are represented by one conducting wire, and the positive and negative lines or the three-phase lines are collected in the current probe.
Preferably, performing gridding processing on the preprocessed finished automobile model by using Hypermesh; the simulation is carried out by electromagnetic simulation software FEKO.
The invention also discloses a vehicle EMC diagnosis system based on semi-physical simulation, which comprises:
the model establishing and processing module is used for establishing a whole vehicle model and a part model, preprocessing the whole vehicle model and the part model to remove parts which have no influence on EMC analysis, and extracting a wire harness path inside the whole vehicle;
the gridding processing module is used for carrying out gridding processing on the preprocessed finished automobile model to obtain a finished automobile grid model;
a data acquisition module for acquiring common mode interference current I, port voltage U of each part, and equivalent port impedance Z of interference source in the whole vehicleSAnd equivalent port impedance Z of general partsR；
The simulation module is used for simulating a finished automobile grid model and a finished automobile internal wire harness path, establishing an antenna model at a preset distance of the finished automobile grid model, taking common-mode interference current I as an excitation signal, and performing simulation calculation on a scattering coefficient S and an interference source port equivalent voltage VSThe radiation emission condition of the whole vehicle is obtained, and the receiving voltage U on the receiving antenna model is obtainedant(ii) a The receiving antenna comprises a loop antenna model and a monopole antenna model;
an antenna calibration module for calibrating the receiving antenna model to obtain the magnetic field antenna coefficient AF of the loop antenna modelHAnd electric field antenna coefficient AF of monopole antenna modelE；
A data processing module for converting the scattering coefficient S into a Z parameter in combination with the parameter U, ZS、ZR、VS、Uant、AFHAnd AFEAnd decomposing the EMI of the whole vehicle level into superposition of a plurality of interference sources EMI, and further comparing the contribution value of each interference source to the EMI of the whole vehicle to find out the EMI exceeding parts.
Preferably, the test verification module is further included, and is configured to implement a test verification process: and closing the EMI exceeding parts in a darkroom test scene, and then performing EMC test to obtain the radiation emission condition of the whole vehicle to confirm whether the closed parts exceed the EMI.
Compared with the prior art, the invention has the advantages that:
according to the complete vehicle EMC diagnosis method and system based on semi-physical simulation, the traditional testing and simulation technology is combined, the EMC simulation result is used for guiding the positioning work of the overproof interference source in the complete vehicle, the overproof interference source is quickly and accurately positioned, the traditional EMC complete vehicle testing frequency is greatly reduced, the use of darkroom fields is greatly reduced, a large amount of complete vehicle EMC darkroom testing cost is saved for vehicle manufacturers, and the later-stage rectification cost of the vehicle caused by EMC problems is reduced.
Drawings
Fig. 1 is a flowchart of an EMC diagnostic method for a vehicle according to an embodiment of the present invention.
Fig. 2 is a radiation emission prediction model diagram of a 10-port network in the present invention.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1, the complete vehicle EMC diagnosis method based on semi-physical simulation according to the embodiment of the present invention includes the steps of:
1) modeling a whole vehicle and internal parts with EMC characteristics not meeting the national standard to obtain a whole vehicle model and a part model, preprocessing the whole vehicle model and the part model, and extracting a wire harness path inside the whole vehicle; wherein the pretreatment comprises: removing components that do not affect the EMC analysis, such as windshields, wheels, car seats, etc.;
2) carrying out gridding processing on the preprocessed finished automobile model to obtain a finished automobile grid model;
3) collecting common-mode interference current I on a wire harness path in the whole vehicle, port voltage U of each part and equivalent port impedance Z of an interference source in the whole vehicleSAnd equivalent port impedance of general components not acting as interference source and sensitive sourceZR；
4) Leading a whole vehicle grid model and a whole vehicle internal wire harness path into electromagnetic simulation software FEKO, and establishing a receiving antenna model at a position 3m away from the whole vehicle model; taking the common-mode interference current I as an excitation signal, and performing simulation calculation on a scattering coefficient S and an equivalent voltage V of an interference source portSAnd the radiation emission condition of the whole vehicle and the voltage U on the receiving antenna model are obtainedant；
5) Calibrating the receiving antenna in the electromagnetic simulation software FEKO to obtain the magnetic field antenna coefficient AF of the loop antennaHAnd electric field antenna coefficient AF of monopole antennaE(ii) a Wherein the receiving antenna comprises a loop antenna and a monopole antenna;
6) converting scattering coefficient S into Z parameter, combining with parameter U, ZS、ZR、VS、Uant、AFHAnd AFEDecomposing the EMI of the whole vehicle level into superposition of a plurality of interference sources EMI, and further comparing the contribution value of each interference source to the EMI of the whole vehicle, thereby finding out the EMI parts exceeding the standard;
7) and (3) testing and verifying: the method comprises the steps of closing parts with excessive EMI in a darkroom test scene in a targeted manner, then carrying out EMC test, and observing whether the radiation emission condition of the whole vehicle meets the national standard after closing the parts; if the EMI of the closed parts meets the national standard, judging that the EMI of the closed parts exceeds the standard; otherwise, the diagnosis is carried out again.
According to the complete vehicle EMC diagnosis method based on semi-physical simulation, the traditional testing and simulation technology is combined, the EMC simulation result is used for guiding the positioning work of the overproof interference source in the complete vehicle, the overproof interference source is quickly and accurately positioned, the EMC testing times of the traditional complete vehicle are greatly reduced, the use of darkroom fields is greatly reduced, a large amount of complete vehicle EMC darkroom testing expenses are saved for vehicle manufacturers, and the later-stage rectification expenses caused by EMC problems of the vehicle are reduced.
In a specific embodiment, in step 4), a loop antenna model and a monopole antenna model are respectively established, the loop antenna is irradiated by a uniform plane wave with a preset magnetic field intensity, the direction of the magnetic field is along the axial direction of the loop antenna, and a receiving electrode is connected to an antenna portResistance Z0(ii) a And irradiating the monopole antenna with uniform plane waves with preset electric field intensity, wherein the electric field direction is along the axial direction of the antenna, and a receiving resistor Z is connected to an antenna port0。
In one embodiment, in step 5), the voltage U will be receivedantAs the reciprocal, the magnetic field antenna coefficient AF of the loop antenna model is obtainedHAnd electric field antenna coefficient AF of monopole antenna modelE。
In one embodiment, in step 6), the S parameter is converted to the Z parameter, in combination with the parameter U, ZS、ZR、VS、Uant、AFH、AFEAnd obtaining a prediction formula of low-frequency radiation emission of the whole vehicle, and comparing the contribution value of each interference source to the EMI of the whole vehicle, thereby finding out the parts with the EMI exceeding the standard.
The embodiment of the invention also discloses a complete vehicle EMC diagnosis system based on semi-physical simulation, which is used for executing the complete vehicle EMC diagnosis method and specifically comprises the following steps:
the model establishing and processing module is used for establishing a whole vehicle model and a part model, preprocessing the whole vehicle model and the part model to remove parts which have no influence on EMC analysis, and extracting a wire harness path in the whole vehicle;
the gridding processing module is used for carrying out gridding processing on the preprocessed finished automobile model to obtain a finished automobile grid model;
the data acquisition module is used for acquiring common-mode interference current I on a wire harness path inside the whole vehicle, port voltage U of each part and equivalent port impedance Z of an interference source inside the whole vehicleSAnd equivalent port impedance Z of general componentsR；
The simulation module is used for simulating a finished automobile grid model and a finished automobile internal wire harness path, establishing an antenna model at a preset distance of the finished automobile grid model, taking common-mode interference current I as an excitation signal, and performing simulation calculation on a scattering coefficient S and an interference source port equivalent voltage VSThe radiation emission condition of the whole vehicle is obtained, and the receiving voltage U on the receiving antenna model is obtainedant(ii) a The receiving antenna comprises a loop antenna moduleType and monopole antenna models;
an antenna calibration module for calibrating the receiving antenna model to obtain the magnetic field antenna coefficient AF of the loop antenna modelHAnd electric field antenna coefficient AF of monopole antenna modelE；
A data processing module for converting the scattering coefficient S into a Z parameter in combination with the parameter U, ZS、ZR、VS、Uant、AFHAnd AFEDecomposing the EMI of the whole vehicle level into superposition of a plurality of EMI sources, further comparing the contribution value of each EMI source to the EMI of the whole vehicle, and finding out EMI overproof parts;
the test verification module is used for realizing the test verification process: and closing the EMI exceeding parts in a darkroom test scene, and then performing EMC test to obtain the radiation emission condition of the whole vehicle to confirm whether the EMI exceeding of the closed parts exists.
The vehicle EMC diagnosis system based on semi-physical simulation is used for executing the vehicle EMC diagnosis method and has the advantages of the vehicle EMC diagnosis method.
In a specific embodiment, in a gridding processing module, carrying out gridding processing on the processed model by using Hypermesh; in the simulation module, simulation is carried out through electromagnetic simulation software FEKO.
The invention will be further described in detail with reference to a specific embodiment:
firstly, the EMI characteristic of the whole vehicle needs to be tested in a darkroom, the test result is compared with the GB/T18387 standard, and whether the EMI of the vehicle exceeds the standard or not is judged;
after the EMI of the whole vehicle exceeds the standard, processing and simplifying a whole vehicle model and a part model, removing a non-metal material part in Hypermesh software, simplifying details of a vehicle body and parts, preventing local meshes from being too dense, and extracting a wiring harness path in the whole vehicle;
carrying out mesh division processing on the processed model by using Hypermesh to obtain a finished automobile mesh model;
collecting interference current on a wire harness when a vehicle works by using a current probe; there are three considerations in the acquisition process:
(1) the positive and negative poles of the direct current line in the vehicle and each phase of the three phase lines are bound and wired, the phase lines are almost completely parallel and have consistent lengths, and the distance between the phase lines can be ignored and kept unchanged compared with the length of the phase lines, so that the differential mode interference current is not easy to form radiation, only the common mode interference current on the wire harness is collected, and the test is simple and convenient;
(2) when the common-mode interference current is collected, each pair of positive and negative lines and three-phase lines are represented by one conducting wire, and the positive and negative lines or the three-phase lines are collected in a current probe;
(3) for the shielded wire, since the signal collected by the current probe is an interference current on the shielding layer, it needs to be equivalent to a bare wire.
The components are classified into interference source components, sensitive source components and general components according to the EMC characteristics of the components.
Measuring the port voltage U of each part and the equivalent port impedance Z of the interference source part in the whole vehicle by using a network vector analyzerSEquivalent port impedance Z of sensitive source parts in whole vehicleLAnd equivalent port impedance Z of general components not acting as interference source and sensitive sourceR；
Respectively establishing a loop antenna model and a monopole antenna model in electromagnetic simulation software FEKO, wherein the sizes, shapes and port impedances of the loop antenna model and the monopole antenna model are required to be consistent with those of an antenna used for EMC prediction diagnosis of the whole vehicle; irradiating the loop antenna by using uniform plane waves with the magnetic field intensity of 1A/m, wherein the magnetic field direction is along the axial direction of the loop antenna, and a receiving resistor Z of 50 omega is connected to an antenna port; irradiating the monopole antenna by using uniform plane waves with the electric field intensity of 1V/m, wherein the electric field direction is along the axis direction of the antenna, a receiving resistor Z with the frequency of 0.15 MHz-30 MHz is connected to an antenna port, and the receiving voltage U on the loop antenna and the monopole antenna is obtained by performing simulation calculation on the monopole antenna and the receiving resistor Z with the frequency of 50 ohmsantWill U isantAs the reciprocal, the magnetic field antenna coefficient AF of the loop antenna can be obtainedHAnd electric field antenna system of monopole antennaNumber AFE；
Introducing a finished automobile grid model into electromagnetic simulation software FEKO, establishing a wire harness model according to a wire harness path inside a finished automobile, establishing a peripheral circuit model of each part port according to the port impedance of each part acquired by a network vector analyzer, writing common-mode interference current into a current excitation source, establishing an antenna model at a preset distance (such as 3 meters) on the left side of the finished automobile model, and performing simulation calculation to obtain a scattering coefficient S and an equivalent voltage V of an interference source portSReceiving antenna voltage Uant；
Processing the scattering coefficient S parameter matrix, converting the scattering coefficient S parameter matrix into a Z parameter matrix form, and calculating by combining the acquired parameters to obtain a prediction formula of the low-frequency radiation emission (0.15 MHz-30 MHz) of the whole vehicle, wherein the whole processing process is detailed by taking a 10-port network as an example:
wherein subscripts "I", "II" and "ant" are respectively interference source, general components not serving as interference source and sensitive source, and matrix or vector related to receiving antenna, E is unit matrix, Z is unit matrix0For reference impedance, typically 50 Ω, the specific steps are as follows:
in the formula:
Sant-I＝[S10 1 S10 2 S10 3]；
Sant-II＝[S10 4 … S10 9]；
Sant-ant＝S10 10。
expressing the port characteristics and port voltage U of each part by Thevenin equivalent circuitiPort current IiThe relationship is shown in formula (2), VS，iFor the equivalent voltage of each interference source port, the subscripts "I", "II", "ant" are the interference source, and general components not serving as the interference source and the sensitive source, respectively.
It is represented in the form of a block matrix:
in the formula: vS＝[VS，1，VS，2，VS，3]T；ZS＝diag(ZS，1，ZS，2，ZS，3)；
ZR＝diag(ZR，1，ZR，2，…，ZR，6)，ZR，iIs the equivalent port impedance of each general component.
Combining equation (1) and equation (3) can obtain the receiving voltage on the antenna as:
Uant＝(Zant-IA11+Zant-IIA21+Zant-antA31)VS (4)
in the formula A11、A21、A31Is represented by equation (5):
the antenna coefficient obtained by calibration can convert the receiving voltage on the receiving antenna into the electromagnetic field intensity, so that the prediction formula of the low-frequency whole vehicle radiation emission can be obtained as follows:
|E|＝(Zant-IA11+Zant-IIA21+Zant-antA31)VS·AFE (6)
|H|＝(Zant-IA11+Zant-IIA21+Zant-antA31)VS·AFH (7)
comparing the contribution value of each interference source to the EMI of the whole vehicle, and further finding out the EMI overproof parts;
closing the EMI exceeding parts, testing the EMI condition of the whole vehicle, and observing whether the EMI condition of the whole vehicle meets the national standard or is greatly reduced; if the EMI of the whole vehicle meets the national standard or is greatly reduced, the EMI of the closed parts can be further judged to be out of limits.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A whole vehicle EMC diagnosis method based on semi-physical simulation is characterized by comprising the following steps:
establishing a whole vehicle model and a part model, preprocessing the whole vehicle model and the part model to remove parts which have no influence on EMC analysis, and extracting a wire harness path inside the whole vehicle;
carrying out gridding processing on the preprocessed finished automobile model to obtain a finished automobile grid model;
obtaining common-mode interference current I on a wire harness path inside a finished automobile, port voltage U of each part and equivalent port impedance Z of an interference source inside the finished automobileSAnd equivalent port impedance Z of general partsR；
Simulating a finished automobile grid model and a finished automobile internal wire harness path, establishing an antenna model at a preset distance of the finished automobile grid model, taking common-mode interference current I as an excitation signal, and performing simulation calculation on a scattering coefficient S and an interference source port equivalent voltage VSAnd obtaining the receiving voltage U on the receiving antenna modelant(ii) a The receiving antenna comprises a loop antenna model and a monopole antenna model;
calibrating the receiving antenna model to obtain the magnetic field antenna coefficient AF of the loop antenna modelHAnd electric field antenna coefficient AF of monopole antenna modelE；
Converting the scattering coefficient S into a Z parameter, combining the parameters U, ZS、ZR、VS、Uant、AFHAnd AFEAnd decomposing the EMI of the whole vehicle level into superposition of a plurality of interference sources EMI, and further comparing the contribution value of each interference source to the EMI of the whole vehicle to find out the EMI exceeding parts.
2. The vehicle EMC diagnosis method based on semi-physical simulation of claim 1, wherein after the EMI exceeding parts are obtained, the EMI exceeding parts are tested and verified: and closing the EMI exceeding parts in a darkroom test scene, and then performing EMC test to obtain the radiation emission condition of the whole vehicle to confirm whether the EMI exceeding of the closed parts exists.
3. The vehicle EMC diagnosis method based on semi-physical simulation according to claim 1 or 2, characterized in that when an antenna model is established, a loop antenna model and a monopole antenna model are respectively established, a uniform plane wave with preset magnetic field intensity is used for irradiating the loop antenna, the magnetic field direction is along the axis direction of the loop antenna, and a receiving resistor is connected to an antenna port; and irradiating the monopole antenna by using uniform plane waves with preset electric field intensity, wherein the electric field direction is along the axis direction of the antenna, and a receiving resistor is connected to an antenna port.
4. The semi-physical simulation-based complete vehicle EMC diagnosis method of claim 3, wherein a received voltage U is measuredantAs an inverse number, thereby obtaining a magnetic field antenna coefficient AF of the loop antenna modelHAnd electric field antenna coefficient AF of monopole antenna modelE。
5. The semi-physical simulation-based complete vehicle EMC diagnosis method of claim 1 or 2, wherein S parameters are converted into Z parameters, and the Z parameters are combined with the parameters U, ZS、ZR、VS、Uant、AFH、AFEAnd obtaining a prediction formula of low-frequency radiation emission of the whole vehicle, and comparing the contribution value of each interference source to the EMI of the whole vehicle, thereby finding out the parts with the EMI exceeding the standard.
6. The semi-physical simulation based complete vehicle EMC diagnosis method of claim 1 or 2, wherein the parts inside the complete vehicle comprise interference source parts, sensitive source parts and general parts.
7. The semi-physical simulation-based finished automobile EMC diagnosis method of claim 1 or 2, wherein in the step 3), when the common-mode interference current is collected, each pair of positive and negative lines and the three-phase line are represented by one conducting wire, and meanwhile, the positive and negative lines or the three-phase line are collected in a current probe.
8. The semi-physical simulation-based complete vehicle EMC diagnosis method of claim 1 or 2, wherein the preprocessed complete vehicle model is subjected to gridding processing by using Hypermesh; the simulation is carried out by electromagnetic simulation software FEKO.
9. The utility model provides a whole car EMC diagnostic system based on semi-physical simulation which characterized in that includes:
the model establishing and processing module is used for establishing a whole vehicle model and a part model, preprocessing the whole vehicle model and the part model to remove parts which have no influence on EMC analysis, and extracting a wire harness path in the whole vehicle;
the gridding processing module is used for carrying out gridding processing on the preprocessed finished automobile model to obtain a finished automobile grid model;
a data acquisition module for acquiring common mode interference current I, port voltage U of each part, and equivalent port impedance Z of interference source in the whole vehicleSAnd equivalent port impedance Z of general partsR；
The simulation module is used for simulating a finished automobile grid model and a finished automobile internal wire harness path, establishing an antenna model at a preset distance of the finished automobile grid model, taking common-mode interference current I as an excitation signal, and performing simulation calculation on a scattering coefficient S and an interference source port equivalent voltage VSAnd obtaining the receiving voltage U on the receiving antenna modelant(ii) a The receiving antenna comprises a loop antenna model and a monopole antenna model;
an antenna calibration module for calibrating the receiving antenna model to obtain the magnetic field antenna coefficient AF of the loop antenna modelHAnd electric field antenna coefficient AF of monopole antenna modelE；
A data processing module for converting the scattering coefficient S into a Z parameter in combination with the parameter U, ZS、ZR、VS、Uant、AFHAnd AFEAnd decomposing the EMI of the whole vehicle level into superposition of a plurality of interference sources EMI, and further comparing the contribution value of each interference source to the EMI of the whole vehicle to find out the EMI exceeding parts.
10. The semi-physical simulation-based finished automobile EMC diagnostic system of claim 9, further comprising a test validation module for implementing a test validation process: and closing the EMI exceeding parts in a darkroom test scene, and then performing EMC test to obtain the radiation emission condition of the whole vehicle to confirm whether the EMI exceeding of the closed parts exists.
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| CN116029056A (en) * | 2023-03-29 | 2023-04-28 | 长安新能源南京研究院有限公司 | Whole vehicle radiation simulation prediction method, device, equipment and medium |
| CN116029056B (en) * | 2023-03-29 | 2023-10-24 | 深蓝汽车南京研究院有限公司 | Whole vehicle radiation simulation prediction method, device, equipment and medium |
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