Electromagnetic noise suppression method and vehicle

Abstract

The invention discloses an electromagnetic noise suppression method and a vehicle, and the electromagnetic noise suppression method comprises the following steps: S1, placing a whole vehicle in an anechoic chamber or a shielding chamber, selecting at least one electromagnetic noise region in a riding space of the whole vehicle, and measuring the electromagnetic noise of the electromagnetic noise region; s3, selecting a wave-absorbing material covering plate according to the measured frequency of the electromagnetic noise in the electromagnetic noise area; and S5, the wave-absorbing material covering plate is installed in an electromagnetic noise area of the whole vehicle so that electromagnetic noise in the passenger space can be reduced. Corresponding wave-absorbing material covering plates are installed in an electromagnetic noise area, under the condition that a disturbance source and a propagation path restrain electromagnetic disturbance, three-way resultant force is formed in combination with use of electromagnetic wave-absorbing materials, the passive absorption function in an objective environment is added besides internal restraining and shielding, and therefore the electromagnetic disturbance is restrained. Repeated damage caused by original disordered repeated reflection of electromagnetic disturbance in a vehicle is reduced into single-time disposable radiation, and complexity and harmfulness of an electromagnetic environment in the vehicle are reduced to a great extent.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic compatibility technology for vehicles, and in particular to an electromagnetic noise suppression method and a vehicle. Background Technology

[0002] Electromagnetic radiation is an inherent characteristic of electrical equipment during operation, and creating a good electromagnetic environment inside a vehicle has become a major challenge for the automotive industry.

[0003] The safety of a car's structure is mainly based on the application of the overall metal structure of the car body, forming a metal shell. Moreover, with the increasing number of electronic and electrical products, the electromagnetic radiation energy generated is also disordered and high-intensity. The car's metal shell forms an inherent shielding layer that prevents the dissipation of this energy. The energy is reflected back and forth inside the car, forming repetitive interference and further increasing the car's electromagnetic energy. This electromagnetic energy can not only interfere with the normal operation of electrical appliances inside the car, but also cause unpredictable harm to the human body. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a method for suppressing electromagnetic noise in a vehicle, which can reduce electromagnetic noise within the passenger space.

[0005] The present invention also proposes a vehicle that applies the above-mentioned electromagnetic noise suppression method for the whole vehicle.

[0006] According to a first aspect of the present invention, a method for suppressing electromagnetic noise in a vehicle includes the following steps: S1: placing the vehicle in an anechoic chamber or a shielded room, selecting at least one electromagnetic noise zone within the passenger space of the vehicle, and measuring the electromagnetic noise in the electromagnetic noise zone; S3: selecting an absorbing material cover plate according to the frequency of the measured electromagnetic noise in the electromagnetic noise zone; S5: installing the absorbing material cover plate onto the electromagnetic noise zone of the vehicle to reduce the electromagnetic noise in the passenger space.

[0007] According to the electromagnetic noise suppression method for the whole vehicle of the present invention, by installing corresponding absorbing material covers in the electromagnetic noise area, under the premise of suppressing electromagnetic interference at the interference source and propagation path, the use of electromagnetic absorbing materials forms a three-way synergy. In addition to the inherent suppression and shielding, it adds the passive absorption function in the objective environment, reducing the repeated damage caused by the disordered and repeated reflection of electromagnetic interference in the vehicle into a single, one-time radiation, which greatly reduces the complexity and harmfulness of the electromagnetic environment in the vehicle.

[0008] In some embodiments, when selecting at least one electromagnetic noise zone within the passenger space of the vehicle, the regions in which electrical devices with power exceeding a set power are installed are all selected as electromagnetic noise zones, and there are at least two electromagnetic noise zones.

[0009] In some embodiments, the electromagnetic noise zone includes the front door panel area, the rear door panel area, the dashboard area, the roof area, and the trunk area.

[0010] In some embodiments, selecting the absorbing material cover plate according to the frequency of the electromagnetic noise in the measured electromagnetic noise region includes: S31: selecting n frequency stages from a preset first frequency stage to the nth frequency stage, where n is a natural number greater than or equal to 2, based on the electromagnetic noise frequency from low to high; S32: finding the frequency stage where the peak region of the measured electromagnetic noise is concentrated; S33: selecting an absorbing material cover plate that can absorb the electromagnetic noise corresponding to the frequency stage.

[0011] In some embodiments, the measurement of electromagnetic noise in the electromagnetic noise region in step S1 includes: multiple electromagnetic noises measured in the electromagnetic noise region under different vehicle states; the different vehicle states include at least one of: start-up state and driving state.

[0012] In some embodiments, the absorbing material cladding in step S2 consists of at least two layers to absorb electromagnetic noise of different frequencies.

[0013] In some embodiments, the electromagnetic noise is divided into four preset frequency stages, from a first frequency stage to a fourth frequency stage, arranged from low to high frequency. The first frequency stage is less than 30MHz, the second frequency stage is 30-200MHz, the third frequency stage is 200-1000MHz, and the fourth frequency stage is 1000-2000MHz.

[0014] In some embodiments, the microwave absorbing material cover plate includes: a solid pyramidal microwave absorbing material cover plate, a high magnetic permeability microwave absorbing material cover plate, a rubber flat plate microwave absorbing material cover plate, a multi-band composite microwave absorbing material cover plate, a lithium cadmium ferrite coating, and a silicon carbide composite microwave absorbing material cover plate.

[0015] In some embodiments, the step S5 of installing the wave-absorbing material cover to the electromagnetic noise area of ​​the vehicle further includes: installing the wave-absorbing material cover on the outside of the inner protective panel; installing the wave-absorbing material cover in the underside space below the dashboard, the wave-absorbing material cover extending vertically and shielding the engine compartment horizontally; installing the wave-absorbing material cover under the vehicle roof, the wave-absorbing material cover being parallel to the bottom wall of the vehicle roof; and installing the wave-absorbing material cover inside the rear panel cover of the vehicle.

[0016] According to the second aspect of the present invention, the electromagnetic noise suppression method of the whole vehicle according to the first aspect of the present invention is applied to the vehicle.

[0017] According to the present invention, by applying the electromagnetic noise suppression method of the whole vehicle described in the first aspect, the vehicle interior interference is reduced, unintentional electromagnetic radiation generated by electrical appliances in the vehicle is prevented, other electrical equipment or receivers in the vehicle are protected from the interference of these energies and their performance is reduced, and the human body is also protected from repeated damage from reflected electromagnetic waves.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a flowchart of an electromagnetic noise suppression method for a vehicle according to an embodiment of the present invention. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0022] The following describes the electromagnetic noise suppression direction of the whole vehicle according to the first aspect of the present invention, including the following steps: S1: placing the whole vehicle in an anechoic chamber or a shielded room, selecting at least one electromagnetic noise area in the passenger space of the whole vehicle, and measuring the electromagnetic noise of the electromagnetic noise area; S3: selecting an absorbing material cover plate according to the frequency of the electromagnetic noise in the measured electromagnetic noise area; S5: installing the absorbing material cover plate to the electromagnetic noise area of ​​the whole vehicle to reduce the electromagnetic noise in the passenger space.

[0023] It is understandable that electromagnetic radiation is an inherent characteristic of electrical equipment during operation; it cannot be eliminated, only suppressed or controlled. Creating a good electromagnetic environment inside a vehicle has become a major challenge for the automotive industry. Current methods primarily target the source of interference, considering electromagnetic compatibility from the initial design stages of vehicle components to minimize unintentional radiation. However, this approach cannot completely solve the problem, and protection costs increase exponentially, creating enormous cost pressures. Secondly, there are methods targeting the wiring harness along the propagation path, such as twisting pairs or adding shielding. Again, this only provides suppression and incurs significant costs, increases vehicle weight, and raises energy consumption.

[0024] The electromagnetic noise suppression method of this invention, in addition to suppressing electromagnetic interference at the source and along the propagation path, combines the use of electromagnetic absorbing materials to form a three-way synergy. In addition to the inherent suppression and shielding, it adds a passive absorption function in the objective environment, reducing the repeated damage caused by the disordered and repeated reflections of electromagnetic interference inside the vehicle to a single, one-time radiation, greatly reducing the complexity and harmfulness of the electromagnetic environment inside the vehicle.

[0025] This invention further reduces electromagnetic radiation inside the vehicle by shielding components and suppressing propagation paths. This method, combined with the vehicle body structure, uses electromagnetic measurements to strategically arrange absorbing materials within a limited area to absorb and weaken electromagnetic energy and reduce reflection, thereby meeting the requirements for electromagnetic safety inside the vehicle.

[0026] Therefore, the complete vehicle in step S1 refers to the welded assembly of body structural components and body panels, including the front fender, doors, engine hood, trunk lid, interior and exterior trim (including dashboard, seats, windshield, carpet, interior trim panels, etc.) and electronic and electrical systems (audio, wiring harness, switches, etc.), plus the chassis system (including braking, suspension system, etc.) and the powertrain system (including engine, transmission, etc.).

[0027] The entire vehicle is placed in an anechoic chamber or shielded room. An anechoic chamber is primarily composed of a shielding enclosure and absorbing materials. The shielding enclosure consists of a shielding shell, shielding doors, ventilation waveguide windows, and various power filters. By conducting tests within an anechoic chamber or shielded room, interference from external electromagnetic signals on the test signals can be reduced. Simultaneously, the electromagnetic wave absorbing materials can minimize the impact of reflections from walls and ceilings on the test results, thus improving test accuracy.

[0028] At least one electromagnetic noise zone is selected within the passenger space of the vehicle, that is, the passenger space of the vehicle is artificially divided into multiple electromagnetic noise zones. For example, the area below the dashboard within the passenger space is designated as an electromagnetic noise zone.

[0029] Next, the electromagnetic noise in the electromagnetic noise region is measured, that is, the electromagnetic radiation level in this electromagnetic noise region is tested. Optionally, electromagnetic radiation can be collected using a directional antenna.

[0030] Step S3 involves selecting an absorbing material cladding based on the measured frequency of the electromagnetic noise in the electromagnetic noise region. The absorbing material cladding can absorb / reduce electromagnetic energy from direct or reflected signals.

[0031] It is understandable that the collected electromagnetic radiation measurements have multiple frequencies, and different absorbing materials have different absorption effects on electromagnetic radiation of different frequencies. Therefore, based on the electromagnetic radiation frequency after testing, the absorbing material with better absorption of electromagnetic radiation should be selected to achieve the best absorption effect.

[0032] Step S5 involves installing the absorbing material cover plate in the electromagnetic noise area of ​​the vehicle to reduce electromagnetic noise in the passenger space. By installing the absorbing material cover plate in the electromagnetic noise area, not only can a large amount of electromagnetic energy be absorbed, but the repeated emission of electromagnetic waves inside the vehicle can also be greatly suppressed. This purifies the electromagnetic environment inside the vehicle to a certain extent, protecting the electrical appliances inside the vehicle, especially highly sensitive electrical appliances represented by intelligent driving systems. At the same time, it also protects the human body from repeated harm from electromagnetic energy.

[0033] According to the vehicle noise suppression method of the present invention, by installing corresponding absorbing material covers in the electromagnetic noise area, the method suppresses electromagnetic interference from the source and propagation path, and combines the use of electromagnetic absorbing materials to form a three-way synergy. In addition to the inherent suppression and shielding, it adds a passive absorption function in the objective environment, reducing the repeated damage caused by the disordered and repeated reflections of electromagnetic interference in the vehicle to a single, one-time radiation, which greatly reduces the complexity and harmfulness of the electromagnetic environment in the vehicle.

[0034] In some embodiments of the present invention, when selecting at least one electromagnetic noise zone within the passenger space of the vehicle, all areas where electrical devices with power exceeding a set power are installed are selected as electromagnetic noise zones, and there are at least two electromagnetic noise zones.

[0035] Electrical devices with power exceeding the set power generate more electromagnetic radiation. Therefore, when dividing passenger space into electromagnetic noise zones, it is preferable to designate areas with electrical devices that have power exceeding the set power as electromagnetic noise zones.

[0036] In some embodiments of the present invention, the electromagnetic noise zone includes the front door panel area, the rear door panel area, the dashboard area, the roof area, and the trunk area.

[0037] The front door panel area is located on the front door panel of the vehicle, and the rear door panel area is located on the rear door panel. The area beneath either the front or rear door panel is the main routing area for the vehicle's wiring harness, resulting in significant electromagnetic radiation. Furthermore, the proximity to interfering wiring harnesses and the curved structure of these areas strongly reflect and concentrate electromagnetic energy, interfering with the reception of low-frequency signals. Examples include tire pressure monitoring signals from the BDM (Battery Management System) and key recognition signals.

[0038] The instrument panel area is located below the instrument panel, which is a densely populated area of ​​electrical components and a major source of interference from these components.

[0039] The vehicle roof area, located on the vehicle roof itself, is a cage-like structure. Electromagnetic interference energy cannot dissipate into the external space through this area, resulting in repeated reflections and affecting the receiving sensitivity of high-precision positioning antennas, such as FM / DAB antennas.

[0040] The trunk area is located at the trunk cover of the vehicle. Similarly, the trunk cover is constructed as a cage structure, so electromagnetic interference energy cannot be dissipated to the external space through the trunk cover area, thus forming repeated reflections.

[0041] It is worth noting that the electromagnetic noise zone is not only an area where electromagnetic radiation easily accumulates and is reflected, but also requires easy installation of absorbing material covers. The front door panels, rear door panels, under the dashboard, the vehicle roof, and the trunk lid are all suitable locations for installing absorbing material covers without significantly interfering with the passenger space or affecting its usability. The electromagnetic noise suppression method of this invention reduces the complexity and harmfulness of the in-vehicle electromagnetic environment without affecting the normal use of the vehicle.

[0042] In some embodiments of the present invention, step S3, selecting the absorbing material cover plate according to the frequency of the electromagnetic noise in the measured electromagnetic noise region, includes: S31: dividing the electromagnetic noise into n frequency stages from a preset first frequency stage to the nth frequency stage, where n is a natural number greater than or equal to 2; S32: finding the frequency stage where the peak region of the measured electromagnetic noise is concentrated; S33: selecting the absorbing material cover plate that can absorb the electromagnetic noise of the corresponding frequency stage.

[0043] The electromagnetic noise is divided into n frequency stages, from the first frequency stage to the nth frequency stage, arranged from low to high, where n is greater than or equal to 2. For example, the electromagnetic noise can be divided into four frequency stages, from the first frequency stage to the fourth frequency stage, arranged from low to high.

[0044] The preset n frequency stages are manually set, and the selection range of frequency bands and the number of segments can be selected according to actual needs.

[0045] Find the frequency range in which the measured electromagnetic noise peak region is located, and then select a microwave absorbing material cladding that can absorb the frequency band of the peak region where the electromagnetic noise is concentrated.

[0046] The electromagnetic waves in passenger space are complex and varied. Therefore, an electromagnetic noise zone may contain electromagnetic waves of multiple frequencies. Different absorbing materials have different absorption effects on electromagnetic radiation of different frequencies. Therefore, the absorbing material should be selected according to the frequency range of the peak region where the electromagnetic radiation is concentrated after testing in order to achieve the best absorption effect.

[0047] In some embodiments of the present invention, measuring the electromagnetic noise in the electromagnetic noise region in step S1 includes: measuring multiple electromagnetic noises in the electromagnetic noise region under different vehicle states; the different vehicle states include at least one of: starting state and driving state.

[0048] When a vehicle is in the starting and driving state, the components inside the vehicle are working, and the electromagnetic environment in the passenger space is relatively complex. Therefore, it is necessary to select the electromagnetic noise of the vehicle in the starting and driving state.

[0049] In addition to these, different vehicle states also include the parked state. Cars are already the most widely used and longest-used mode of transportation, no longer merely serving a point-to-point location transfer function; many people now regard their cars as a second "home." They can play games, watch TV shows and movies, rest and get massages, and even reside in their cars for extended periods. Therefore, the electromagnetic safety of vehicles when parked must receive greater attention, and the electromagnetic noise of vehicles in the parked state must be measured.

[0050] In some embodiments of the present invention, the absorbing material cladding in step S2 consists of at least two layers to absorb electromagnetic noise of different frequencies.

[0051] The electromagnetic waves in passenger space are complex and varied. Therefore, an electromagnetic noise zone may contain electromagnetic waves of multiple frequencies. Different absorbing materials have different absorption effects on electromagnetic radiation of different frequencies. By setting up multiple layers of absorbing materials, the coverage of electromagnetic wave absorption can be improved.

[0052] In some embodiments of the present invention, the electromagnetic noise is preset into four frequency stages from low to high: a first frequency stage to a fourth frequency stage. The first frequency stage is less than 30MHz, the second frequency stage is 30-200MHz, the third frequency stage is 200-1000MHz, and the fourth frequency stage is 1000-2000MHz.

[0053] The four frequency ranges are the high-frequency occurrence frequencies of electromagnetic noise in the vehicle. Therefore, selecting these four frequency ranges and using corresponding absorbing material covers for absorption can greatly reduce the complexity and harmfulness of the electromagnetic environment in the vehicle.

[0054] In other embodiments of the present invention, electromagnetic noise can also be classified according to the CISPR25 standard: below 30MHz, 30MHz-1000MHz, and above 1GHz.

[0055] In some embodiments of the present invention, the microwave absorbing material cover plate includes: solid pyramid microwave absorbing material cover plate, high magnetic permeability microwave absorbing material cover plate, rubber flat plate microwave absorbing material cover plate, multi-band composite microwave absorbing material cover plate, lithium cadmium ferrite coating, and silicon carbide composite microwave absorbing material cover plate.

[0056] Among them, the solid cone absorbing material cladding is used in frequencies from 80MHz to 100GHz and has good performance in vertical incidence, oblique incidence, scattering and transmission attenuation.

[0057] High-permeability absorbing material cladding (such as HFC-A series absorbing materials) effectively absorbs electromagnetic radiation in the frequency range of 10MHz to 20GHz.

[0058] Rubber flat plate absorbing material cover (MKT rubber flat plate absorbing material cover) can achieve good absorption at the resonant frequency, and the vertical incident reflectivity can reach below -17dB.

[0059] Multi-band composite absorbing material cladding can achieve efficient electromagnetic wave absorption in multiple frequency bands and is suitable for complex electromagnetic environments.

[0060] The lithium-cadmium ferrite coating is optimized for specific frequency bands and has good absorption performance.

[0061] Silicon carbide composite absorbing material cladding achieves high-efficiency absorption through novel materials (such as nanomaterials and metamaterials) or special structural designs.

[0062] In some embodiments of the present invention, step S5, which involves installing the wave-absorbing material cover plate to the electromagnetic noise area of ​​the vehicle, further includes: installing the wave-absorbing material cover plate on the outside of the inner protective panel; installing the wave-absorbing material cover plate in the underside space below the dashboard, with the wave-absorbing material cover plate extending vertically and shielding the engine compartment horizontally; installing the wave-absorbing material cover plate under the vehicle roof, with the wave-absorbing material cover plate parallel to the bottom wall of the vehicle roof; and installing the wave-absorbing material cover plate inside the rear panel cover of the vehicle.

[0063] The inner lining includes the front door inner lining and the rear door inner lining. According to the structure of the inner lining, the selected absorbing material cladding is installed on the inside of the inner lining, and then the inner lining is installed. It can absorb / reduce direct or reflected electromagnetic energy.

[0064] A radar-absorbing material cladding is installed in the space beneath the instrument panel. The space beneath the instrument panel is relatively large, allowing for the installation of the cladding. The cladding extends vertically and horizontally shields the engine compartment. An radar-absorbing wall is constructed within the space beneath the instrument panel using the absorbing material, absorbing / reducing the rearward movement of electromagnetic interference from the engine compartment.

[0065] Installing a wave-absorbing material cladding panel under the vehicle roof, with the panel parallel to the bottom wall of the roof, can reduce the occupancy of passenger space and decrease reflected interference.

[0066] Installing a radar-absorbing material cover inside the rear panel of a vehicle can reduce reflected interference.

[0067] By installing wave-absorbing material covers in the five locations mentioned above, covering the upper, lower, left, and right spaces of the passenger compartment, the main shielding reflector of the vehicle body is transformed into an electromagnetic energy absorption surface. This not only absorbs a large amount of electromagnetic energy but also greatly suppresses the repeated emission of electromagnetic waves inside the vehicle, thus purifying the electromagnetic environment inside the vehicle to a certain extent and protecting the electrical appliances inside the vehicle, especially highly sensitive electrical appliances represented by intelligent driving systems. At the same time, it also protects the human body from repeated harm from electromagnetic energy.

[0068] According to the second aspect of the present invention, the electromagnetic noise suppression method of the whole vehicle according to the first aspect of the present invention is applied to the vehicle.

[0069] According to the present invention, by applying the electromagnetic noise suppression method of the whole vehicle described in the first aspect, the vehicle interior interference is reduced, unintentional electromagnetic radiation generated by electrical appliances in the vehicle is prevented, other electrical equipment or receivers in the vehicle are protected from the interference of these energies and their performance is reduced, and the human body is also protected from repeated damage from reflected electromagnetic waves.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for suppressing electromagnetic noise in a vehicle, characterized in that, Includes the following steps: S1: Place the entire vehicle in an anechoic chamber or shielded room, select at least one electromagnetic noise zone within the passenger space of the vehicle, and measure the electromagnetic noise of the electromagnetic noise zone. S3: Select the absorbing material cladding plate according to the measured frequency of the electromagnetic noise in the electromagnetic noise area; S5: Install the microwave absorbing material cover plate onto the electromagnetic noise area of ​​the vehicle to reduce electromagnetic noise in the passenger space.

2. The electromagnetic noise suppression method for a vehicle according to claim 1, characterized in that, When selecting at least one electromagnetic noise zone within the passenger space of the vehicle, the areas where electrical devices with power exceeding a set power are installed are all selected as electromagnetic noise zones, and there are at least two electromagnetic noise zones.

3. The electromagnetic noise suppression method for a vehicle according to claim 1, characterized in that, The electromagnetic noise zone includes the front door panel area, rear door panel area, dashboard area, roof area, and trunk area.

4. The electromagnetic noise suppression method for a vehicle according to claim 1, characterized in that, The step of selecting the absorbing material cladding based on the measured frequency of the electromagnetic noise in the electromagnetic noise region includes: S31: The electromagnetic noise is divided into n frequency stages from the first frequency stage to the nth frequency stage, which are preset from low to high frequency, where n is a natural number greater than or equal to 2. S32: Locate the frequency range in which the measured peak region of the electromagnetic noise is concentrated; S33; Select a diaphragm material that can absorb electromagnetic noise corresponding to the frequency range.

5. The electromagnetic noise suppression method for a vehicle according to claim 1, characterized in that, The measurement of electromagnetic noise in the electromagnetic noise region in step S1 includes: multiple electromagnetic noises measured in the electromagnetic noise region under different vehicle states; The different states of the vehicle include at least one of the following: starting state and driving state.

6. The electromagnetic noise suppression method for a vehicle according to claim 5, characterized in that, In step S2, the absorbing material cladding has at least two layers to absorb electromagnetic noise of different frequencies.

7. The electromagnetic noise suppression method for a vehicle according to claim 4, characterized in that, The electromagnetic noise is divided into four preset frequency stages from low to high frequency: the first frequency stage is less than 30MHz, the second frequency stage is 30-200MHz, the third frequency stage is 200-1000MHz, and the fourth frequency stage is 1000-2000MHz.

8. The method for suppressing electromagnetic noise in a vehicle according to any one of claims 1-7, characterized in that, The microwave absorbing material cover plate includes: solid pyramid microwave absorbing material cover plate, high magnetic permeability microwave absorbing material cover plate, rubber flat plate microwave absorbing material cover plate, multi-band composite microwave absorbing material cover plate, lithium cadmium ferrite coating, and silicon carbide composite microwave absorbing material cover plate.

9. The method for suppressing electromagnetic noise in a vehicle according to any one of claims 1-7, characterized in that, Step S5, which involves installing the absorbing material cover plate onto the electromagnetic noise area of ​​the vehicle, further includes: The microwave absorbing material cover is installed on the outside of the inner protective plate; The wave-absorbing material cover is installed in the space below the dashboard, and the wave-absorbing material cover extends vertically and shields the engine compartment horizontally. The wave-absorbing material cover is installed under the vehicle roof, and the wave-absorbing material cover is arranged parallel to the bottom wall of the vehicle roof; The wave-absorbing material cover is installed inside the rear panel cover of the vehicle.

10. A vehicle, characterized in that, The electromagnetic noise suppression method for the whole vehicle according to any one of claims 1-9 is applied.

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