Vehicle electromagnetic compatibility radiation anti-interference test method and device, vehicle and medium

Abstract

The present application provides a vehicle electromagnetic compatibility radiation anti-interference test method and device, vehicle and medium, which relates to the field of vehicle testing, including: shielding the wiring harness between the first domain controller and the second domain controller to obtain the wiring harness shielding result; grounding the shielding layer at the first domain controller end or the shielding layer at the second domain controller end, and suspending the shielding layer at the other domain controller end to form capacitive coupling between the shielding layer and the ground plane; and performing electromagnetic compatibility radiation anti-interference test on the vehicle based on the wiring harness shielding result and capacitive coupling. The present application can block the high-frequency interference coupling path by fully shielding the wiring harness between the first domain controller and the second domain controller; and by grounding the shielding layer at the first domain controller end or the second domain controller end, and then suspending the shielding layer at the other domain controller end to form a single-ended grounding, it can prevent high-frequency interference from entering the communication link through wiring harness coupling.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a vehicle electromagnetic compatibility radiation anti-interference testing method and device, a vehicle, and a medium. Background Art

[0002] During the EMC (Electromagnetic Compatibility) radiation immunity test of a vehicle, the Ethernet communication link between the VIU (Vehicle Intranet Unit, domain controller, abbreviated as VIU) will be affected by electromagnetic interference (EMI), resulting in E2E (End-to-End, abbreviated as E2E) verification failure and Ethernet signal loss. The main reasons for the above results may be: (1) The Ethernet harness between the domain controllers is not adequately shielded or the grounding method is improper, such as double-end grounding to form a ground loop, causing high-frequency interference to be coupled into the communication link through the harness; (2) The harness length exceeds the vehicle EMC design requirements, resulting in inconsistency between component-level testing and vehicle-level testing standards (for example, the component harness length is greater than the vehicle harness length), which causes impedance mismatch and amplifies the interference of common-mode noise on differential signals.

[0003] In addition, when conducting EMC radiation anti-interference tests on vehicles, since the component wiring harness length requirements are inconsistent with the vehicle wiring harness length requirements (for example, the component wiring harness length is longer than the vehicle wiring harness length), if Ethernet signal packet loss occurs, the component test will pass but the vehicle test will fail, causing interference to the domain controller during the vehicle anti-interference test. Summary of the Invention

[0004] The present application provides a vehicle electromagnetic compatibility radiation anti-interference test method and device, a vehicle and a medium to solve the technical problems existing in the EMC radiation anti-interference test of a vehicle.

[0005] The present application provides a vehicle electromagnetic compatibility radiation anti-interference test method, comprising the following steps:

[0006] Shielding a wiring harness between the first domain controller and the second domain controller to obtain a wiring harness shielding result;

[0007] Grounding the shielding layer at the first domain controller end and suspending the shielding layer at the second domain controller end; or grounding the shielding layer at the second domain controller end and suspending the shielding layer at the first domain controller end to form capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the shielding result of the wiring harness;

[0008] An electromagnetic compatibility radiation anti-interference test is performed on a vehicle based on the wiring harness shielding result and the capacitive coupling; wherein the vehicle includes the first domain controller and the second domain controller.

[0009] In one embodiment of the present application, the process of shielding the wiring harness between the first domain controller and the second domain controller includes:

[0010] shielding the outer layer of the wiring harness between the first domain controller and the second domain controller by a combination of aluminum foil and braided copper mesh; and / or,

[0011] The inner layer of the wiring harness between the first domain controller and the second domain controller is shielded by individually wrapping the twisted pair cables with aluminum foil.

[0012] In one embodiment of the present application, after forming capacitive coupling between the shielding layer and the ground plane, the method further includes:

[0013] The distributed capacitance between the shielding layer and the internal wiring harness is used as the distributed capacitance between the interference source and the signal line, which is recorded as parasitic capacitance; wherein the interference source is used to apply noise voltage;

[0014] Calculating a high-frequency noise current coupled from the parasitic capacitance to the signal line based on the parasitic capacitance, the noise voltage applied by the interference source, and a phase difference between the noise voltage and the noise current;

[0015] Controlling the high-frequency noise current to flow on the surface of the shielding layer, and calculating the skin depth according to the magnetic permeability of the shielding layer material, the electrical conductivity of the shielding layer material and a preset angular frequency;

[0016] The shielding layer material is adjusted according to the skin depth.

[0017] In one embodiment of the present application, the method further includes:

[0018] The domain controller end that is being suspended is recorded as the suspended end, and the capacitance of the exposed wire harness of the suspended end is calculated;

[0019] The length of the parallel section of the conductor in the floating end exposed wire harness and the width of the conductor in the floating end exposed wire harness are adjusted to reduce the capacitance of the floating end exposed wire harness; this includes: reducing the length of the parallel section of the conductor in the floating end exposed wire harness and reducing the width of the conductor in the floating end exposed wire harness; or, under the condition that the floating end exposed wire harness is cylindrical, reducing the length of the parallel section of the conductor in the floating end exposed wire harness or increasing the distance between the floating end wire harness and the ground plane.

[0020] In one embodiment of the present application, the method further includes:

[0021] Blocking the common mode current between the first domain controller and the second domain controller by using common mode impedance, wherein the common mode impedance is obtained by a common mode yoke coil provided between the first domain controller and the second domain controller; and / or,

[0022] adjusting the common-mode impedance according to the length of the wiring harness between the first domain controller and the second domain controller, and optimizing the signal transmission matching degree according to the common-mode impedance adjustment result; and / or,

[0023] A common mode noise voltage is detected, and an inverted waveform is generated based on the common mode noise voltage and injected into a ground path, and noise cancellation is performed by injecting the inverted waveform into the ground path.

[0024] In one embodiment of the present application, the method further includes:

[0025] Adding a terminal resistor at the Ethernet physical chip end between the first domain controller and the second domain controller; and / or,

[0026] enhancing high-frequency components through an Ethernet physical chip between the first domain controller and the second domain controller, and using the high-frequency components to perform harness attenuation compensation; and / or,

[0027] The resonance point is set for the preset interference frequency through a pre-integrated or real-time filtering circuit.

[0028] In one embodiment of the present application, the method further includes: adding a timestamp and a serial number during the electromagnetic compatibility radiation anti-interference test of the vehicle, and distinguishing occasional Ethernet signal packet loss by the timestamp and serial number, or distinguishing continuous interference by the timestamp and serial number.

[0029] The present application also provides a vehicle electromagnetic compatibility radiation anti-interference testing device, the device comprising:

[0030] A wire harness shielding module, used for shielding the wire harness between the first domain controller and the second domain controller to obtain a wire harness shielding result;

[0031] A capacitive coupling module is configured to ground the shielding layer at the first domain controller end and suspend the shielding layer at the second domain controller end; or, to ground the shielding layer at the second domain controller end and suspend the shielding layer at the first domain controller end, thereby forming a capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the shielding result of the wiring harness;

[0032] A testing module is used to perform an electromagnetic compatibility radiation anti-interference test on a vehicle based on the wiring harness shielding result and the capacitive coupling; wherein the vehicle includes the first domain controller and the second domain controller.

[0033] The present application also provides a vehicle, which is applied to the vehicle electromagnetic compatibility radiation anti-interference test device as described above, or the vehicle is applied to the vehicle electromagnetic compatibility radiation anti-interference test method as described in any one of the above.

[0034] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any one of the above-mentioned vehicle electromagnetic compatibility radiation anti-interference testing methods are implemented.

[0035] Beneficial effects of the present application: The present application proposes a vehicle electromagnetic compatibility radiation anti-interference test method and device, a vehicle and a medium, which obtains a harness shielding result by shielding the harness between the first domain controller and the second domain controller; the shielding layer at the first domain controller end is grounded, and the shielding layer at the second domain controller end is suspended; or the shielding layer at the second domain controller end is grounded, and the shielding layer at the first domain controller end is suspended, forming a capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the harness shielding result; according to the harness shielding result and the capacitive coupling, the vehicle is subjected to an electromagnetic compatibility radiation anti-interference test; wherein the vehicle includes a first domain controller and a second domain controller. It can be seen that the present application can block the high-frequency interference coupling path by fully shielding the harness between the first domain controller and the second domain controller; at the same time, by grounding the shielding layer at the first domain controller end or the second domain controller end, and then suspending the shielding layer at the other domain controller end to form a single-ended grounding, a ground loop can be avoided, ensuring that the shielding layer effectively discharges the interference current, thereby preventing high-frequency interference from entering the communication link through harness coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0037] In the attached figure:

[0038] Figure 1 A schematic flow chart of a vehicle electromagnetic compatibility radiation anti-interference testing method provided in one embodiment of the present application;

[0039] Figure 2 A schematic diagram of the hardware structure of a vehicle electromagnetic compatibility radiation anti-interference test device provided in one embodiment of the present application;

[0040] Figure 3The figure is a schematic diagram of the hardware structure of a computer device suitable for implementing one or more embodiments of the present application. DETAILED DESCRIPTION

[0041] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand other advantages and functions of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0042] It should be understood that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0043] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0044] Figure 1 A schematic flow chart of a vehicle electromagnetic compatibility radiation anti-interference test method is shown. Specifically, in an exemplary embodiment, as Figure 1 As shown, this embodiment provides a vehicle electromagnetic compatibility radiation anti-interference test method, including the following steps:

[0045] S110: Shield the wiring harness between the first domain controller and the second domain controller to obtain a wiring harness shielding result. In some examples, the wiring harness between the first domain controller and the second domain controller may be an Ethernet wiring harness. In some examples, the wiring harness shielding result includes, but is not limited to, an outer shielding result of the wiring harness between the first domain controller and the second domain controller and an inner shielding result of the wiring harness between the first domain controller and the second domain controller.

[0046] S120: Grounding the shielding layer at the first domain controller and suspending the shielding layer at the second domain controller; or grounding the shielding layer at the second domain controller and suspending the shielding layer at the first domain controller to form capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the shielding results of the wiring harness. As some examples, the shielding layer includes but is not limited to being formed based on the shielding results of the outer layer of the wiring harness between the first domain controller and the second domain controller, and also includes being formed based on the shielding results of the inner layer of the wiring harness between the first domain controller and the second domain controller.

[0047] S130: Perform an electromagnetic compatibility radiation anti-interference test on the vehicle based on the wiring harness shielding results and capacitive coupling; wherein the vehicle includes a first domain controller and a second domain controller.

[0048] In some embodiments of the present application, the process of shielding the wiring harness between the first domain controller and the second domain controller includes: shielding the outer layer of the wiring harness between the first domain controller and the second domain controller by combining aluminum foil and a braided copper mesh; and / or shielding the inner layer of the wiring harness between the first domain controller and the second domain controller by individually wrapping the twisted pair with aluminum foil. As an example, in order to prevent interference from high-frequency electric fields such as 16~38MHz, the outer layer of the wiring harness between the first domain controller and the second domain controller can be shielded by combining aluminum foil and a braided copper mesh. In this case, the combination of aluminum foil and the braided copper mesh can be used as a shielding layer. As another example, in order to offset crosstalk between differential signal lines, the inner layer of the wiring harness between the first domain controller and the second domain controller can be shielded by individually wrapping the twisted pair with aluminum foil. In this case, the aluminum foil can be used as a shielding layer. In addition, when shielding the wiring harness between the first domain controller and the second domain controller, the shielding effectiveness can also be calculated, as follows: SE=R+X+B, where SE represents shielding effectiveness; R represents reflection loss, which is related to the surface impedance and frequency of the shielding layer material; X represents absorption loss, which is related to the thickness and frequency of the shielding layer; and B represents multiple reflection correction loss. By calculating the shielding effectiveness, the shielding layer material's ability to suppress electromagnetic interference can be quantified, thereby selecting a suitable shielding layer material when shielding the wiring harness between the first domain controller and the second domain controller. Shielding layer materials include but are not limited to aluminum foil, braided copper mesh, and the like. Therefore, by performing outer and inner shielding on the wiring harness between the first domain controller and the second domain controller, the wiring harness between the first domain controller and the second domain controller can be fully shielded, thereby reconstructing the electromagnetic compatibility of the Ethernet wiring harness between the first domain controller and the second domain controller, blocking the high-frequency interference coupling path, and meeting the vehicle-level EMC test requirements.

[0049] In some embodiments of the present application, due to the potential difference between different grounding points, such as the difference in grounding resistance between different parts of the vehicle body and the voltage fluctuation caused by large current loads, a closed current path will be formed in the shielding layer, which is called a ground loop. At this time, the shielding layer at the first domain controller end can be grounded, and the shielding layer at the second domain controller end can be suspended; or, the shielding layer at the second domain controller end can be grounded, and the shielding layer at the first domain controller end can be suspended. At this time, capacitive coupling is formed between the shielding layer and the ground, but there is no DC path, thereby blocking the formation of the ground loop. Since the shielding layer is only grounded at one end, any noise current with a frequency lower than the cutoff frequency of the shielding layer cannot form a closed loop. The cutoff frequency of the shielding layer is determined by the distributed capacitance. The distributed capacitance between the shielding layer and the internal wiring harness constitutes a bypass for high-frequency interference, which directly guides the noise to the ground. Therefore, after capacitive coupling is formed between the shielding layer and the ground plane, the vehicle electromagnetic compatibility radiation anti-interference test method can also include:

[0050] The distributed capacitance between the shield and the internal wiring harness is treated as the distributed capacitance between the interference source and the signal line, and is recorded as parasitic capacitance. The interference source is used to apply noise voltage. As some examples, interference sources include but are not limited to high-voltage wiring harnesses and radio frequency radiation sources.

[0051] Based on the parasitic capacitance, the noise voltage applied by the interference source, and the phase difference between the noise voltage and the noise current, the high-frequency noise current coupled into the signal line by the parasitic capacitance is calculated as follows: Where, Represents the high-frequency noise current coupled into the signal line by parasitic capacitance; It is an imaginary unit, indicating that there is a phase difference between the noise voltage and the noise current; represents the angular frequency, represents the parasitic capacitance, Represents the noise voltage applied by the interference source. A single-ended grounded shield acts as an electrostatic shield. External electric fields are neutralized by the surface charge of the shield, and internal signal lines are protected from external electric field interference. When high-frequency interference (e.g., 16 MHz to 100 MHz) couples to the shield through electromagnetic fields, the current quickly flows through the single-ended ground point into the vehicle body ground, preventing accumulation in the shield.

[0052] Control the high-frequency noise current to flow on the surface of the shield layer, and calculate the skin depth based on the magnetic permeability of the shield layer material, the electrical conductivity of the shield layer material and the angular frequency: Where, represents the skin depth, represents the magnetic permeability of the shielding material, Indicates the electrical conductivity of the shielding material. By controlling the high-frequency current flowing on the surface of the shield, the penetration of the internal wiring harness can be further reduced.

[0053] Adjusting the shielding material based on the skin depth can reduce losses through the shielding material adjustment. For example, hollow or flat conductors can be used instead of solid conductors in the shielding material, which can reduce material waste and reduce losses caused by the skin effect.

[0054] In one specific embodiment, when single-ended grounding is used, to prevent parasitic capacitance from introducing a new loop, the shield layer on the first domain controller side can be insulated from the housing, thereby preventing accidental ground loops through paths such as the mounting bracket. Furthermore, the parasitic capacitance of the floating end to ground can be controlled to be less than or equal to 10pF to prevent the formation of hidden ground paths at high frequencies.

[0055] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation anti-interference test method may further include: recording the suspended domain controller end as a suspended end, and calculating the capacitance of the exposed wiring harness of the suspended end, which is: , where Indicates the capacitance of the exposed wiring harness at the floating end, represents the dielectric constant of vacuum, represents the relative dielectric constant of the insulating material, Indicates the parallel length of the conductor in the exposed wire harness at the floating end. Indicates the width of the conductor in the exposed wire harness at the floating end. Indicates the distance between the exposed wire harness at the floating end and the ground plane.

[0056] In order to reduce the effective area of ​​the conductors in the exposed wiring harness at the floating end, the exposed portion of the wiring harness at the floating end can also be shortened, and the length of the parallel segments of the conductors in the exposed wiring harness at the floating end and the width of the conductors in the exposed wiring harness at the floating end can be adjusted to reduce the capacitance of the exposed wiring harness at the floating end. As an example, the process of adjusting the length of the parallel segments of the conductors in the exposed wiring harness at the floating end and the width of the conductors in the exposed wiring harness at the floating end includes: reducing the length of the parallel segments of the conductors in the exposed wiring harness at the floating end, and reducing the width of the conductors in the exposed wiring harness at the floating end. Moreover, by reducing the length of the parallel segments of the conductors in the exposed wiring harness at the floating end, the length of the component wiring harness is reduced, so that the final length of the component wiring harness is consistent with the length of the vehicle wiring harness.

[0057] As another example, for the capacitance between a cylindrical bundle and the ground plane, we have: , where Represents the radius of a cylindrical wiring harness. Furthermore, adjusting the parallel length and width of the conductors in the floating end exposed wiring harness can include reducing the parallel length of the conductors in the floating end exposed wiring harness. Alternatively, increasing the distance between the floating end wiring harness and the ground plane. Furthermore, reducing the parallel length of the conductors in the floating end exposed wiring harness is equivalent to reducing the length of the component wiring harness, thereby ensuring that the resulting component wiring harness length is consistent with the overall vehicle wiring harness length.

[0058] As another example, for the capacitance of the parallel plate capacitor model, we can obtain: , It is expressed as the effective area between the conductor and the ground plane in the floating end harness. Indicates the distance between the floating end harness and the ground plane. , using polytetrafluoroethylene insulation ( =2.1), the interval distance =1mm, the maximum permissible facing area is: .

[0059] Therefore, to reduce the capacitance of exposed wiring harnesses at the floating end, the distance between the conductor and the ground can be increased. This can be achieved through structural design, which increases the material spacing between the floating harness and nearby conductors or ground planes. Harness geometry can also be optimized to avoid parallel routing and reduce the effective coupling area. If the floating end is shielded, ensuring that the signal line and shield are completely coaxial can also be achieved to eliminate fringing electric fields.

[0060] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation immunity testing method may further include: blocking common-mode current between the first domain controller and the second domain controller using common-mode impedance, where the common-mode impedance is provided by a common-mode yoke coil disposed between the first domain controller and the second domain controller. As an example, a common-mode yoke coil (CMC) may be installed at both ends of an Ethernet wiring harness to block common-mode current using the high common-mode impedance of the common-mode yoke coil.

[0061] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation immunity testing method may further include: detecting a common-mode noise voltage, generating an inverted waveform based on the common-mode noise voltage and injecting it into a ground path, and performing noise cancellation by injecting the inverted waveform into the ground path. Furthermore, adjusting the common-mode impedance based on the length of the wiring harness between the first domain controller and the second domain controller, and optimizing signal transmission matching based on the common-mode impedance adjustment result.

[0062] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation and interference immunity testing method may further include: adding a terminal resistor to the Ethernet physical chip between the first domain controller and the second domain controller. As an example, a 100Ω terminal resistor may be added to the Ethernet physical layer chip (PHY) between the first domain controller and the second domain controller to reduce radiation caused by signal reflection and perform differential signal terminal matching.

[0063] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation interference immunity testing method may further include: enhancing high-frequency components via an Ethernet physical chip between the first domain controller and the second domain controller, and using the high-frequency components to compensate for wiring harness attenuation. As an example, the high-frequency components may be enhanced via pre-emphasis in the Ethernet PHY chip, and equalization at the receiving end may compensate for wiring harness attenuation.

[0064] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation immunity testing method may further include: setting a resonance point for a preset interference frequency using a pre- or real-time integrated filter circuit. As an example, a π-type filter circuit (capacitor + ferrite + capacitor) may be integrated to set an LC resonance point for a preset interference frequency such as 16 MHz or 38 MHz.

[0065] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation interference resistance testing method may further include: adding a timestamp and a sequence number during the electromagnetic compatibility radiation interference resistance testing of the vehicle, and distinguishing occasional Ethernet signal packet loss by the timestamp and sequence number, or distinguishing continuous interference by the timestamp and sequence number. As an example, during the electromagnetic compatibility radiation interference resistance testing of the vehicle, a timestamp and a sequence number may be added to the existing CRC (Cyclic Redundancy Check, abbreviated as CRC) check, thereby distinguishing occasional Ethernet signal packet loss by the timestamp and sequence number, or distinguishing continuous interference by the timestamp and sequence number.

[0066] In summary, the present application proposes a vehicle electromagnetic compatibility radiation interference resistance test method, which obtains the wiring harness shielding result by shielding the wiring harness between the first domain controller and the second domain controller; the shielding layer at the first domain controller end is grounded, and the shielding layer at the second domain controller end is suspended; or the shielding layer at the second domain controller end is grounded, and the shielding layer at the first domain controller end is suspended, forming a capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the wiring harness shielding result; according to the wiring harness shielding result and the capacitive coupling, the vehicle is subjected to an electromagnetic compatibility radiation interference resistance test; wherein the vehicle includes a first domain controller and a second domain controller. It can be seen that the present method can block the high-frequency interference coupling path by fully shielding the wiring harness between the first domain controller and the second domain controller; at the same time, by grounding the shielding layer at the first domain controller end or the second domain controller end, and then suspending the shielding layer at the other domain controller end to form a single-ended grounding, a ground loop can be avoided, ensuring that the shielding layer effectively discharges the interference current, thereby preventing high-frequency interference from entering the communication link through the wiring harness coupling. In addition, this method can also reduce the effective area of ​​the conductor and shorten the exposed part of the floating end harness; increase the distance between the conductor and the ground, increase the material distance between the suspended harness and nearby conductors or the ground plane through structural design, reduce the capacitance of the exposed harness at the floating end, and minimize the capacitance of the floating end. Moreover, this method can also optimize the harness geometry, avoid parallel routing, and reduce the effective coupling area; if the floating end is a shielded wire, it can also ensure that the signal line and the shielding layer are completely coaxial to eliminate the fringe electric field. And this method reduces the length of the parallel section of the conductor in the exposed harness at the floating end, which is equivalent to reducing the length of the component harness, so that the final component harness length is consistent with the length of the vehicle harness.

[0067] In another exemplary embodiment of the present application, Figure 2 As shown, a vehicle electromagnetic compatibility radiation anti-interference test device is also provided, including:

[0068] The wiring harness shielding module 210 is configured to shield the wiring harness between the first domain controller and the second domain controller to obtain a wiring harness shielding result. In some examples, the wiring harness between the first domain controller and the second domain controller may be an Ethernet wiring harness. In some examples, the wiring harness shielding result includes, but is not limited to, an outer shielding result of the wiring harness between the first domain controller and the second domain controller, and an inner shielding result of the wiring harness between the first domain controller and the second domain controller.

[0069] The capacitive coupling module 220 is configured to ground the shielding layer at the first domain controller and suspend the shielding layer at the second domain controller; alternatively, ground the shielding layer at the second domain controller and suspend the shielding layer at the first domain controller to form a capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the shielding results of the wiring harness. As some examples, the shielding layer includes, but is not limited to, forming based on the shielding results of the outer layer of the wiring harness between the first domain controller and the second domain controller, and also includes forming based on the shielding results of the inner layer of the wiring harness between the first domain controller and the second domain controller.

[0070] The testing module 230 is used to perform an electromagnetic compatibility radiation anti-interference test on the vehicle based on the wiring harness shielding results and capacitive coupling; wherein the vehicle includes a first domain controller and a second domain controller.

[0071] In some embodiments of the present application, the process of shielding the wiring harness between the first domain controller and the second domain controller by the wiring harness shielding module 210 includes: shielding the outer layer of the wiring harness between the first domain controller and the second domain controller by combining aluminum foil and braided copper mesh; and / or shielding the inner layer of the wiring harness between the first domain controller and the second domain controller by individually wrapping the twisted pair with aluminum foil. As an example, in order to prevent interference from high-frequency electric fields such as 16~38MHz, the outer layer of the wiring harness between the first domain controller and the second domain controller can be shielded by combining aluminum foil and braided copper mesh. In this case, the combination of aluminum foil and braided copper mesh can be used as a shielding layer. As another example, in order to offset crosstalk between differential signal lines, the inner layer of the wiring harness between the first domain controller and the second domain controller can be shielded by individually wrapping the twisted pair with aluminum foil. In this case, the aluminum foil can be used as a shielding layer. In addition, when shielding the wiring harness between the first domain controller and the second domain controller, the shielding effectiveness can also be calculated, as follows: SE=R+X+B, where SE represents shielding effectiveness; R represents reflection loss, which is related to the surface impedance and frequency of the shielding layer material; X represents absorption loss, which is related to the thickness and frequency of the shielding layer; and B represents multiple reflection correction loss. By calculating the shielding effectiveness, the shielding layer material's ability to suppress electromagnetic interference can be quantified, thereby selecting a suitable shielding layer material when shielding the wiring harness between the first domain controller and the second domain controller. Shielding layer materials include but are not limited to aluminum foil, braided copper mesh, and the like. Therefore, by performing outer and inner shielding on the wiring harness between the first domain controller and the second domain controller, the wiring harness between the first domain controller and the second domain controller can be fully shielded, thereby reconstructing the electromagnetic compatibility of the Ethernet wiring harness between the first domain controller and the second domain controller, blocking the high-frequency interference coupling path, and meeting the vehicle-level EMC test requirements.

[0072] In some embodiments of the present application, due to the potential difference between different grounding points, such as the difference in grounding resistance between different parts of the vehicle body and the voltage fluctuation caused by large current loads, a closed current path will be formed in the shielding layer, which is called a ground loop. At this time, the shielding layer at the first domain controller end can be grounded, and the shielding layer at the second domain controller end can be suspended; or, the shielding layer at the second domain controller end can be grounded, and the shielding layer at the first domain controller end can be suspended. At this time, capacitive coupling is formed between the shielding layer and the ground, but there is no DC path, thereby blocking the formation of the ground loop. Since the shielding layer is only grounded at one end, any noise current with a frequency lower than the cutoff frequency of the shielding layer cannot form a closed loop. The cutoff frequency of the shielding layer is determined by the distributed capacitance. The distributed capacitance between the shielding layer and the internal wiring harness constitutes a bypass for high-frequency interference, which directly guides the noise to the ground. Therefore, after capacitive coupling is formed between the shielding layer and the ground plane, the vehicle electromagnetic compatibility radiation anti-interference test device can also include:

[0073] The distributed capacitance between the shield and the internal wiring harness is treated as the distributed capacitance between the interference source and the signal line, and is recorded as parasitic capacitance. The interference source is used to apply noise voltage. As some examples, interference sources include but are not limited to high-voltage wiring harnesses and radio frequency radiation sources.

[0074] Based on the parasitic capacitance, the noise voltage applied by the interference source, and the phase difference between the noise voltage and the noise current, the high-frequency noise current coupled into the signal line by the parasitic capacitance is calculated as follows: Where, Represents the high-frequency noise current coupled into the signal line by parasitic capacitance; It is an imaginary unit, indicating that there is a phase difference between the noise voltage and the noise current; represents the angular frequency, represents the parasitic capacitance, Represents the noise voltage applied by the interference source. A single-ended grounded shield acts as an electrostatic shield. External electric fields are neutralized by the surface charge of the shield, and internal signal lines are protected from external electric field interference. When high-frequency interference (e.g., 16 MHz to 100 MHz) couples to the shield through electromagnetic fields, the current quickly flows through the single-ended ground point into the vehicle body ground, preventing accumulation in the shield.

[0075] Control the high-frequency noise current to flow on the surface of the shield layer, and calculate the skin depth based on the magnetic permeability of the shield layer material, the electrical conductivity of the shield layer material and the angular frequency: Where, represents the skin depth, represents the magnetic permeability of the shielding material, Indicates the electrical conductivity of the shielding material. By controlling the high-frequency current flowing on the surface of the shield, the penetration of the internal wiring harness can be further reduced.

[0076] Adjusting the shielding material based on the skin depth can reduce losses through the shielding material adjustment. For example, hollow or flat conductors can be used instead of solid conductors in the shielding material, which can reduce material waste and reduce losses caused by the skin effect.

[0077] In one specific embodiment, when single-ended grounding is used, to prevent parasitic capacitance from introducing a new loop, the shield layer on the first domain controller side can be insulated from the housing, thereby preventing accidental ground loops through paths such as the mounting bracket. Furthermore, the parasitic capacitance of the floating end to ground can be controlled to be less than or equal to 10pF to prevent the formation of hidden ground paths at high frequencies.

[0078] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation anti-interference testing device may further include: recording the suspended domain controller end as a suspended end, and calculating the capacitance of the exposed wiring harness of the suspended end, which is: , where Indicates the capacitance of the exposed wiring harness at the floating end, represents the dielectric constant of vacuum, represents the relative dielectric constant of the insulating material, Indicates the parallel length of the conductor in the exposed wire harness at the floating end. Indicates the width of the conductor in the exposed wire harness at the floating end. Indicates the distance between the exposed wire harness at the floating end and the ground plane.

[0079] In order to reduce the effective area of ​​the conductors in the exposed wiring harness at the floating end, the exposed portion of the wiring harness at the floating end can also be shortened, and the length of the parallel segments of the conductors in the exposed wiring harness at the floating end and the width of the conductors in the exposed wiring harness at the floating end can be adjusted to reduce the capacitance of the exposed wiring harness at the floating end. As an example, the process of adjusting the length of the parallel segments of the conductors in the exposed wiring harness at the floating end and the width of the conductors in the exposed wiring harness at the floating end includes: reducing the length of the parallel segments of the conductors in the exposed wiring harness at the floating end, and reducing the width of the conductors in the exposed wiring harness at the floating end. Moreover, by reducing the length of the parallel segments of the conductors in the exposed wiring harness at the floating end, the length of the component wiring harness is reduced, so that the final length of the component wiring harness is consistent with the length of the vehicle wiring harness.

[0080] As another example, for the capacitance between a cylindrical bundle and the ground plane, we have: , where Represents the radius of a cylindrical wiring harness. Furthermore, adjusting the parallel length and width of the conductors in the floating end exposed wiring harness can include reducing the parallel length of the conductors in the floating end exposed wiring harness. Alternatively, increasing the distance between the floating end wiring harness and the ground plane. Furthermore, reducing the parallel length of the conductors in the floating end exposed wiring harness is equivalent to reducing the length of the component wiring harness, thereby ensuring that the resulting component wiring harness length is consistent with the overall vehicle wiring harness length.

[0081] As another example, for the capacitance of the parallel plate capacitor model, we can obtain: , It is expressed as the effective area between the conductor and the ground plane in the floating end harness. Indicates the distance between the floating end harness and the ground plane. , using polytetrafluoroethylene insulation ( =2.1), the interval distance =1mm, the maximum permissible facing area is: .

[0082] Therefore, to reduce the capacitance of exposed wiring harnesses at the floating end, the distance between the conductor and the ground can be increased. This can be achieved through structural design, which increases the material spacing between the floating harness and nearby conductors or ground planes. Harness geometry can also be optimized to avoid parallel routing and reduce the effective coupling area. If the floating end is shielded, ensuring that the signal line and shield are completely coaxial can also be achieved to eliminate fringing electric fields.

[0083] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation interference immunity testing device may further include: blocking common-mode current between the first domain controller and the second domain controller through common-mode impedance, where the common-mode impedance is provided by a common-mode yoke coil disposed between the first domain controller and the second domain controller. As an example, a common-mode yoke coil (CMC) may be installed at both ends of an Ethernet wiring harness to block common-mode current using the high common-mode impedance of the common-mode yoke coil.

[0084] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation interference immunity testing device may further include: detecting common-mode noise voltage, generating an inverted waveform based on the common-mode noise voltage and injecting it into a ground path, and performing noise cancellation by injecting the inverted waveform into the ground path. Furthermore, adjusting common-mode impedance based on the length of the wiring harness between the first domain controller and the second domain controller, and optimizing signal transmission matching based on the common-mode impedance adjustment result.

[0085] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation and interference immunity testing device may further include: adding a terminal resistor to the Ethernet physical chip between the first domain controller and the second domain controller. As an example, a 100Ω terminal resistor may be added to the Ethernet physical layer chip (PHY) between the first and second domain controllers to reduce radiation caused by signal reflection and perform differential signal terminal matching.

[0086] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation interference immunity test device may further include: enhancing high-frequency components through an Ethernet physical chip between the first domain controller and the second domain controller, and using the high-frequency components to compensate for wiring harness attenuation. As an example, the high-frequency components may be enhanced through pre-emphasis in the Ethernet PHY chip, and equalization at the receiving end may compensate for wiring harness attenuation.

[0087] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation immunity test device may further include: setting a resonance point for a preset interference frequency using a pre- or real-time integrated filter circuit. As an example, a π-type filter circuit (capacitor + ferrite + capacitor) may be integrated to set an LC resonance point for a preset interference frequency such as 16 MHz or 38 MHz.

[0088] In some embodiments of the present application, the vehicle electromagnetic compatibility radiation and interference resistance testing device may further include: adding a timestamp and a sequence number during the electromagnetic compatibility radiation and interference resistance testing of the vehicle, and distinguishing occasional Ethernet signal packet loss by the timestamp and sequence number, or distinguishing continuous interference by the timestamp and sequence number. As an example, during the electromagnetic compatibility radiation and interference resistance testing of the vehicle, a timestamp and a sequence number may be added to the existing CRC (Cyclic Redundancy Check, abbreviated as CRC) check, thereby distinguishing occasional Ethernet signal packet loss by the timestamp and sequence number, or distinguishing continuous interference by the timestamp and sequence number.

[0089] In summary, the present application proposes a vehicle electromagnetic compatibility radiation interference resistance test device, which obtains the wiring harness shielding result by shielding the wiring harness between the first domain controller and the second domain controller; the shielding layer at the first domain controller end is grounded, and the shielding layer at the second domain controller end is suspended; or the shielding layer at the second domain controller end is grounded, and the shielding layer at the first domain controller end is suspended, forming a capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the wiring harness shielding result; according to the wiring harness shielding result and the capacitive coupling, the vehicle is subjected to an electromagnetic compatibility radiation interference resistance test; wherein the vehicle includes a first domain controller and a second domain controller. It can be seen that the present device can block the high-frequency interference coupling path by fully shielding the wiring harness between the first domain controller and the second domain controller; at the same time, by grounding the shielding layer at the first domain controller end or the second domain controller end, and then suspending the shielding layer at the other domain controller end to form a single-ended grounding, a ground loop can be avoided, ensuring that the shielding layer effectively discharges the interference current, thereby preventing high-frequency interference from entering the communication link through the wiring harness coupling. In addition, this device can also reduce the effective area of ​​the conductor and shorten the exposed part of the floating end harness; increase the distance between the conductor and the ground, increase the material distance between the suspended harness and nearby conductors or the ground plane through structural design, reduce the capacitance of the exposed harness at the floating end, and minimize the capacitance of the floating end. Moreover, this device can also optimize the harness geometry, avoid parallel routing, and reduce the effective coupling area; if the floating end is a shielded wire, it can also ensure that the signal line and the shielding layer are completely coaxial to eliminate the fringe electric field. In addition, this device reduces the length of the parallel section of the conductor in the exposed harness at the floating end, which is equivalent to reducing the length of the component harness, so that the final component harness length is consistent with the length of the vehicle harness.

[0090] It is understood that the vehicle electromagnetic compatibility radiation anti-interference test device provided in the above-mentioned embodiment and the vehicle electromagnetic compatibility radiation anti-interference test method provided in the above-mentioned embodiment are based on the same concept. The specific manner in which the vehicle electromagnetic compatibility radiation anti-interference test method performs operations has been described in detail in the above-mentioned method embodiment and will not be repeated here. In actual applications, the vehicle electromagnetic compatibility radiation anti-interference test device provided in the above-mentioned embodiment can, as needed, allocate the above-mentioned functions to different functional modules. That is, the internal structure of the vehicle electromagnetic compatibility radiation anti-interference test device can be divided into different functional modules, and then all or part of the functions of the corresponding functional modules can be implemented through the vehicle electromagnetic compatibility radiation anti-interference test method described in the above-mentioned embodiment. This is not specifically limited here.

[0091] In another exemplary embodiment of the present application, the embodiment further provides a computer device, which may include a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program so that the computer device performs Figure 1 The steps of the vehicle electromagnetic compatibility radiation anti-interference testing method. Figure 3 FIG1 shows a schematic diagram of the structure of a computer device 1000. Figure 3 As shown, the computer device 1000 includes: a processor 1010 , a memory 1020 , a power supply 1030 , a display unit 1040 , and an input unit 1060 .

[0092] The processor 1010 is the control center of the computer device 1000. It connects various components using various interfaces and lines, and performs various functions of the computer device 1000 by running or executing computer programs / instructions stored in the memory 1020, thereby monitoring the computer device 1000 as a whole. In the embodiment of the present application, when the processor 1010 calls the computer program stored in the memory 1020, it executes the following Figure 1 The steps of the vehicle electromagnetic compatibility radiation interference resistance test method are as follows. Optionally, processor 1010 may include one or more processing units; preferably, processor 1010 may integrate an application processor and a modem processor, wherein the application processor primarily processes the operating system, user interface, and applications, and the modem processor primarily processes wireless communications. In some embodiments, the processor and memory may be implemented on a single chip; in some embodiments, they may also be implemented on separate chips.

[0093] The memory 1020 may primarily include a program storage area and a data storage area. The program storage area may store an operating system, various applications, and the like; the data storage area may store instruction data and the like generated based on the use of the computer device 1000. Furthermore, the memory 1020 may include a high-speed random access memory and a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0094] The computer device 1000 also includes a power supply 1030 (such as a battery) for supplying power to various components. The power supply can be logically connected to the processor 1010 through a power management system, thereby managing functions such as charging, discharging, and power consumption through the power management system.

[0095] The display unit 1040 can be used to display information input by the user or information provided to the user, as well as various menus of the computer device 1000. In the embodiment of the present application, it is mainly used to display the display interface of each application in the computer device 1000 and objects such as text and images displayed on the display interface. The display unit 1040 may include a display panel 1050. The display panel 1050 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

[0096] The input unit 1060 can be used to receive user input, such as numbers or characters. The input unit 1060 may include a touch panel 1070 and other input devices 1080. The touch panel 1070, also known as a touch screen, can receive user touch operations on or near it (e.g., operations performed by a user using a finger, stylus, or any other suitable object or accessory on or near the touch panel 1070).

[0097] Specifically, the touch panel 1070 can detect user touch operations and the signals generated by the touch operations, convert these signals into touch point coordinates, and transmit them to the processor 1010. Furthermore, the touch panel 1070 can receive and execute commands from the processor 1010. Furthermore, the touch panel 1070 can be implemented using various types, such as resistive, capacitive, infrared, and surface acoustic wave. Other input devices 1080 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, power buttons, etc.), a trackball, a mouse, and a joystick.

[0098] Of course, the touch panel 1070 can cover the display panel 1050. When the touch panel 1070 detects a touch operation on or near it, it transmits it to the processor 1010 to determine the type of touch event. Then the processor 1010 provides corresponding visual output on the display panel 1050 according to the type of touch event. Figure 3 In the embodiment, the touch panel 1070 and the display panel 1050 are two independent components to realize the input and output functions of the computer device 1000, but in some embodiments, the touch panel 1070 and the display panel 1050 can be integrated to realize the input and output functions of the computer device 1000.

[0099] The computer device 1000 may further include one or more sensors, such as a pressure sensor, a gravity acceleration sensor, a proximity light sensor, etc. Of course, according to the needs of specific applications, the computer device 1000 may also include other components such as a camera.

[0100] The embodiment of the present application further provides a computer-readable storage medium, in which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, the above-mentioned device can perform the above-mentioned Figure 1 The steps of the vehicle electromagnetic compatibility radiation anti-interference testing method.

[0101] It will be understood by those skilled in the art that Figure 3 This is merely an example of a computer device and does not constitute a limitation on the device. The device may include more or fewer components than shown, or a combination of certain components, or different components. For ease of description, the above sections are divided into modules (or units) based on their functions and described separately. Of course, when implementing this application, the functions of each module (or unit) can be implemented in the same or multiple software or hardware components. For example, as some examples, the aforementioned computer device can be a vehicle, a vehicle computer, etc.

[0102] Those skilled in the art should understand that the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (apparatus), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be applied to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including the instruction device, which implements the function specified in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0103] In another exemplary embodiment of the present application, a vehicle is provided. The vehicle is used in the vehicle electromagnetic compatibility radiation anti-interference testing method described in some of the above embodiments, or in the vehicle electromagnetic compatibility radiation anti-interference testing device described in some of the above embodiments. Since the specific operation methods of the vehicle electromagnetic compatibility radiation anti-interference testing method and the vehicle electromagnetic compatibility radiation anti-interference testing device have been described in detail in the embodiments, the technical functions and effects of the vehicle provided in this embodiment can be referred to in the above embodiments and will not be repeated here.

[0104] It should be understood that although the terms "first," "second," etc. may be used in this application to describe domain controllers, these terms are only used to distinguish one domain controller from another. For example, without departing from the scope of the embodiments of this application, a first domain controller may also be referred to as a second domain controller, and similarly, a second domain controller may also be referred to as a first domain controller.

[0105] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A vehicle electromagnetic compatibility radiation anti-interference test method, characterized in that: The method comprises the following steps: Shielding a wiring harness between the first domain controller and the second domain controller to obtain a wiring harness shielding result; wherein the process of shielding the wiring harness between the first domain controller and the second domain controller includes: shielding an outer layer of the wiring harness between the first domain controller and the second domain controller by combining aluminum foil and a braided copper mesh; and / or shielding an inner layer of the wiring harness between the first domain controller and the second domain controller by individually wrapping a twisted pair of wires with aluminum foil; Grounding the shielding layer at the first domain controller end and suspending the shielding layer at the second domain controller end; or grounding the shielding layer at the second domain controller end and suspending the shielding layer at the first domain controller end to form capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the shielding result of the wiring harness; An electromagnetic compatibility radiation anti-interference test is performed on a vehicle based on the wiring harness shielding result and the capacitive coupling; wherein the vehicle includes the first domain controller and the second domain controller.

2. The vehicle electromagnetic compatibility radiation anti-interference test method according to claim 1, characterized in that: After forming capacitive coupling between the shielding layer and the ground plane, the method further includes: The distributed capacitance between the shielding layer and the internal wiring harness is used as the distributed capacitance between the interference source and the signal line, which is recorded as parasitic capacitance; wherein the interference source is used to apply noise voltage; Calculating a high-frequency noise current coupled from the parasitic capacitance to the signal line based on the parasitic capacitance, the noise voltage applied by the interference source, and a phase difference between the noise voltage and the noise current; Controlling the high-frequency noise current to flow on the surface of the shielding layer, and calculating the skin depth according to the magnetic permeability of the shielding layer material, the electrical conductivity of the shielding layer material and a preset angular frequency; The shielding layer material is adjusted according to the skin depth.

3. The vehicle electromagnetic compatibility radiation anti-interference test method according to claim 1, characterized in that: The method further comprises: The domain controller end that is being suspended is recorded as the suspended end, and the capacitance of the exposed wire harness of the suspended end is calculated; The length of the parallel section of the conductor in the floating end exposed wire harness and the width of the conductor in the floating end exposed wire harness are adjusted to reduce the capacitance of the floating end exposed wire harness; this includes: reducing the length of the parallel section of the conductor in the floating end exposed wire harness and reducing the width of the conductor in the floating end exposed wire harness; or, under the condition that the floating end exposed wire harness is cylindrical, reducing the length of the parallel section of the conductor in the floating end exposed wire harness or increasing the distance between the floating end wire harness and the ground plane.

4. The vehicle electromagnetic compatibility radiation anti-interference test method according to claim 1, characterized in that: The method further comprises: Blocking the common mode current between the first domain controller and the second domain controller by using common mode impedance, wherein the common mode impedance is obtained by a common mode yoke coil provided between the first domain controller and the second domain controller; and / or, adjusting the common-mode impedance according to the length of the wiring harness between the first domain controller and the second domain controller, and optimizing the signal transmission matching degree according to the common-mode impedance adjustment result; and / or, A common mode noise voltage is detected, and an inverted waveform is generated based on the common mode noise voltage and injected into a ground path, and noise cancellation is performed by injecting the inverted waveform into the ground path.

5. The vehicle electromagnetic compatibility radiation anti-interference test method according to claim 1, characterized in that: The method further comprises: Adding a terminal resistor at the Ethernet physical chip end between the first domain controller and the second domain controller; and / or, enhancing high-frequency components through an Ethernet physical chip between the first domain controller and the second domain controller, and using the high-frequency components to perform harness attenuation compensation; and / or, The resonance point is set for the preset interference frequency through a pre-integrated or real-time filtering circuit.

6. The vehicle electromagnetic compatibility radiation anti-interference test method according to claim 1, characterized in that: The method further includes: adding a timestamp and a serial number during the electromagnetic compatibility radiation anti-interference test on the vehicle, and distinguishing occasional Ethernet signal packet loss by the timestamp and serial number, or distinguishing continuous interference by the timestamp and serial number.

7. A vehicle electromagnetic compatibility radiation anti-interference test device, characterized in that: The device includes: A wiring harness shielding module is configured to shield the wiring harness between the first domain controller and the second domain controller to obtain a wiring harness shielding result. The shielding process of the wiring harness between the first domain controller and the second domain controller includes: shielding the outer layer of the wiring harness between the first domain controller and the second domain controller by combining aluminum foil and a braided copper mesh; and / or shielding the inner layer of the wiring harness between the first domain controller and the second domain controller by individually wrapping the twisted pair wires with aluminum foil. A capacitive coupling module is configured to ground the shielding layer at the first domain controller end and suspend the shielding layer at the second domain controller end; or, to ground the shielding layer at the second domain controller end and suspend the shielding layer at the first domain controller end, thereby forming a capacitive coupling between the shielding layer and the ground plane; wherein the shielding layer is formed based on the shielding result of the wiring harness; A testing module is used to perform an electromagnetic compatibility radiation anti-interference test on a vehicle based on the wiring harness shielding result and the capacitive coupling; wherein the vehicle includes the first domain controller and the second domain controller.

8. A vehicle, characterized in that: The vehicle is applied to the vehicle electromagnetic compatibility radiation anti-interference test device according to claim 7, or the vehicle is applied to the vehicle electromagnetic compatibility radiation anti-interference test method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the vehicle electromagnetic compatibility radiation anti-interference testing method according to any one of claims 1 to 6 are implemented.

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