Electromagnetic interference test box and electromagnetic interference test system

Abstract

The utility model discloses an electromagnetic interference test box and an electromagnetic interference test system, and the electromagnetic interference test box comprises a test housing and a low-voltage test assembly. The low-voltage test assembly comprises a low-voltage power supply interface, a communication interface, a low-voltage control module and a low-voltage output interface; the low-voltage power supply interface, the communication interface and the low-voltage output interface are arranged on the test shell; and the low-voltage control module is connected with the low-voltage power supply interface, the communication interface and the low-voltage output interface, and transmits a power supply signal output by the low-voltage power supply interface to at least one low-voltage test device connected with the low-voltage output interface based on a first control signal output by the communication interface, so that the at least one low-voltage test device works to generate an electromagnetic signal. According to the technical scheme, power can be independently supplied to one or more low-voltage testing devices, so that at least one working low-voltage testing device is subjected to electromagnetic interference testing, the low-voltage testing devices can be accurately positioned, the electromagnetic interference testing difficulty is reduced, and the electromagnetic interference testing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic interference, in particular to an electromagnetic interference test box and an electromagnetic interference test system. Background Technique

[0002] In recent years, with the continuous improvement of vehicle technology, more and more electronic devices are used in vehicles. During the operation of the vehicle, the electronic environment where each electrical component is located becomes more and more complex. Therefore, the electromagnetic interference (EMI) test of electronic and electrical components is particularly important.

[0003] During the development process of vehicle products, the vehicle radiation emission test is a key link to evaluate the external radiation emission intensity of the vehicle. However, in the test process, the vehicle radiation emission often fails to meet the EMI test requirements. At this time, it is necessary to locate the over-standard frequency band of the radiation emission on site. However, due to the complexity of the vehicle system, the positioning work is difficult, often consuming a large amount of time and economic costs, and the troubleshooting and positioning work efficiency is not high. Content of the Utility Model

[0004] The embodiment of the utility model provides an electromagnetic interference test box and an electromagnetic interference test system to solve the problems of high difficulty and low efficiency in the vehicle EMI test.

[0005] An electromagnetic interference test box includes a test housing and a low-voltage test component;

[0006] The low-voltage test component includes a low-voltage power supply interface, a communication interface, a low-voltage control module, and a low-voltage output interface;

[0007] The low-voltage power supply interface, the communication interface, and the low-voltage output interface are arranged on the test housing;

[0008] The low-voltage control module is connected to the low-voltage power supply interface, the communication interface, and the low-voltage output interface, and based on the first control signal output by the communication interface, transmits the power supply signal output by the low-voltage power supply interface to at least one low-voltage test device connected to the low-voltage output interface, so that at least one of the low-voltage test devices works to generate electromagnetic signals.

[0009] Optionally, the low-voltage control module includes a main control unit and a power distribution unit;

[0010] The input end of the main control unit is connected to the low-voltage power supply interface and the communication interface, and the output end of the main control unit is connected to the input end of the power distribution unit, and is used to transmit the first control signal to the power distribution unit;

[0011] The output terminal of the power distribution unit is connected to the low-voltage output interface, and is used to transmit the power supply signal to at least one low-voltage test device connected to the low-voltage output interface.

[0012] Optionally, the power distribution unit includes a driving module and a switching network;

[0013] The input terminal of the driving module is connected to the output terminal of the main control unit, the output terminal of the driving module is connected to the input terminal of the switching network, and the output terminal of the switching network is connected to the low-voltage output interface; the driving module is used to drive the switching network to work according to the first control signal.

[0014] Optionally, the switching network includes a plurality of switches arranged in parallel; the first end of each switch is connected to the output terminal of the driving module, and the second end of each switch is used to connect a low-voltage test device through the low-voltage output interface.

[0015] Optionally, the low-voltage control module further includes a protection module;

[0016] The input terminal of the protection module is connected to the low-voltage power supply interface, and the output terminal of the protection module is connected to the input terminal of the main control unit, and is used to filter the first control signal and / or the power supply signal.

[0017] Optionally, the electromagnetic interference test box further includes a high-voltage test component;

[0018] The high-voltage test component includes a high-voltage power supply interface, a high-voltage control module, and a high-voltage output interface;

[0019] The high-voltage power supply interface and the high-voltage output interface are arranged on the test housing;

[0020] The high-voltage control module is connected to the high-voltage power supply interface and the high-voltage output interface, and is further used to connect a signal transmission device, and based on the second control signal of the signal transmission device, transmit the power supply signal output by the high-voltage power supply interface to at least one high-voltage test device connected to the high-voltage output interface, so that at least one high-voltage test device works to generate electromagnetic signals.

[0021] Optionally, the electromagnetic interference test box further includes an insulating structure; the insulating structure is arranged in the test housing and divides the test housing into a first space and a second space;

[0022] The low-voltage test component is arranged in the first space, and the high-voltage test component is arranged in the second space.

[0023] An electromagnetic interference test system includes the above-mentioned electromagnetic interference test box, test control device, and signal test device;

[0024] The test control device is connected to the communication interface and is used to output a first control signal;

[0025] The signal test device is used to collect electromagnetic signals generated by at least one low-voltage test device connected to the low-voltage output interface, and perform electromagnetic interference tests based on the electromagnetic signals.

[0026] Optionally, the signal test device includes a receiving antenna and a signal receiving device;

[0027] The receiving antenna is used to collect the electromagnetic signals;

[0028] The signal receiving device is connected to the receiving antenna and is used to perform electromagnetic interference tests based on the electromagnetic signals.

[0029] Optionally, the electromagnetic interference test box is arranged on a vehicle; the vehicle includes at least one of the low-voltage test devices and at least one high-voltage test device;

[0030] The low-voltage power interface is used to connect to the low-voltage battery on the vehicle; the communication interface is used to connect the test control device and the signal transmission device on the vehicle; the low-voltage output interface is used to connect to at least one of the low-voltage test devices on the vehicle;

[0031] The high-voltage power interface of the electromagnetic interference test box is used to connect to the high-voltage battery and the signal transmission device on the vehicle; the voltage output interface of the electromagnetic interference test box is used to connect to at least one of the high-voltage test devices on the vehicle;

[0032] The signal test device is used to collect electromagnetic signals generated by at least one of the low-voltage test devices connected to the low-voltage output interface and / or at least one of the high-voltage test devices connected to the high-voltage output interface, and perform electromagnetic interference tests based on the electromagnetic signals.

[0033] The above-mentioned electromagnetic interference test box and electromagnetic interference test system, the electromagnetic interference test box includes a test shell and a low-voltage test component; the low-voltage test component includes a low-voltage power supply interface, a communication interface, a low-voltage control module and a low-voltage output interface; the low-voltage power supply interface, the communication interface and the low-voltage output interface are arranged on the test shell; the low-voltage control module is connected to the low-voltage power supply interface, the communication interface and the low-voltage output interface, and based on the first control signal output by the communication interface, the power supply signal output by the low-voltage power supply interface is transmitted to at least one low-voltage test device connected to the low-voltage output interface, so that at least one low-voltage test device works and generates an electromagnetic signal, so that any one or more low-voltage test devices can be powered separately, so that at least one working low-voltage test device can be subjected to electromagnetic interference testing, and the low-voltage test device can be accurately positioned, the difficulty of electromagnetic interference testing can be reduced, and the efficiency of electromagnetic interference testing can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 This is a schematic diagram of an electromagnetic interference test box in one embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of an electromagnetic interference testing system according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of a power distribution unit in one embodiment of the present invention;

[0038] Figure 4 This is another schematic diagram of the electromagnetic interference testing system in one embodiment of the present invention.

[0039] In the figure: 1. Electromagnetic interference test box; 11. Test housing; 12. Low-voltage test component; 121. Low-voltage power interface; 122. Communication interface; 123. Low-voltage control module; 1231. Main control unit; 1232. Power distribution unit; 123a. Drive module; 123b. Switch network; 124. Low-voltage output interface; 125. Protection module; 13. High-voltage test component; 131. High-voltage power interface; 132. High-voltage control module; 133. High-voltage output interface; 14. Insulation structure; 2. Test control device; 3. Signal test device; 31. Receiving antenna; 32. Signal receiving device; 4. At least one low-voltage test device; 5. At least one high-voltage test device; 6. Low-voltage battery; 7. High-voltage battery; 8. Signal transmission device; 101. Vehicle. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] It should be understood that the present invention can be implemented in different forms and should not be construed as limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout the drawings.

[0042] It should be understood that when an element or layer is referred to as "on", "adjacent to", "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected or coupled to the other element or layer, or there may be intervening elements or layers. In contrast, when an element is referred to as "directly on", "directly adjacent to", "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be denoted as the second element, component, region, layer or part.

[0043] Spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. may be used herein for convenience of description to describe the relationship of one element or feature shown in the figures with other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relationship terms are also intended to include different orientations of the device in use and operation. For example, if the device in the figures is flipped, then an element or feature described as "under other elements" or "beneath them" or "under it" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are to be interpreted accordingly.

[0044] The purpose of the terms used herein is only to describe specific embodiments and not to limit the present utility model. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, identify the presence of features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. When used herein, the term "and / or" includes any and all combinations of the related listed items.

[0045] To fully understand the present utility model, detailed structures and steps will be presented in the following description to explain the technical solutions proposed by the present utility model. The preferred embodiments of the present utility model are described in detail below. However, in addition to these detailed descriptions, the present utility model may have other embodiments.

[0046] This embodiment provides an electromagnetic interference test box 1, as Figure 1 shown, comprising a test housing 11 and a low-voltage test component 12; the low-voltage test component 12 includes a low-voltage power supply interface 121, a communication interface 122, a low-voltage control module 123 and a low-voltage output interface 124; the low-voltage power supply interface 121, the communication interface 122 and the low-voltage output interface 124 are disposed on the test housing 11; the low-voltage control module 123 is connected to the low-voltage power supply interface 121, the communication interface 122 and the low-voltage output interface 124, and based on a first control signal output by the communication interface 122, transmits a power supply signal output by the low-voltage power supply interface 121 to at least one low-voltage test device 4 connected to the low-voltage output interface 124, so that at least one low-voltage test device 4 operates to generate an electromagnetic signal.

[0047] As an example, when the user needs to separately test the electromagnetic interference of a certain low-voltage test device, the first control signal is configured according to actual requirements. The first control signal is input to the low-voltage control module 123 through the communication interface 122. The low-voltage control module 123 transmits the power supply signal output by the low-voltage power supply interface 121 to at least one low-voltage test device 4 connected to the low-voltage output interface 124 according to the first control signal, so that the low-voltage test device corresponding to the first control signal can work normally to generate electromagnetic signals, so that the electromagnetic interference test can be carried out on any one or more low-voltage test devices separately, the low-voltage test device can be accurately positioned, the difficulty of the electromagnetic interference test can be reduced, and the efficiency of the electromagnetic interference test can be improved.

[0048] As an example, when the user conducts an electromagnetic interference test on the low-voltage system in the vehicle 101, exemplarily, the low-voltage system includes a plurality of low-voltage test devices. The plurality of low-voltage test devices include an ignition system, lighting devices, instrument panels, display screens, sensors, audio and entertainment systems, air conditioning and heating systems, and safety systems. By connecting the plurality of low-voltage test devices in the vehicle 101 to the low-voltage output interface 124, the first control signal can be configured according to actual requirements to select the corresponding low-voltage test device for electromagnetic interference testing, so that the electromagnetic interference test can be carried out on any one or more low-voltage test devices separately, the low-voltage test device can be accurately positioned, the difficulty of the electromagnetic interference test can be reduced, and the efficiency of the electromagnetic interference test can be improved.

[0049] As an example, the user can configure the first control signal through the test control device 2. Exemplarily, the test control device 2 includes a host computer.

[0050] As an example, the low-voltage test device refers to a test device operating at a safety voltage. The safety voltage includes 42 volts, 36 volts, 24 volts, 12 volts, and 6 volts. Exemplarily, when the electromagnetic interference test box 1 is applied in the vehicle 101, the low-voltage test device includes devices with the above safety voltages as the operating voltage. Exemplarily, the low-voltage test devices include an ignition system, lighting devices, instrument panels, display screens, sensors, audio and entertainment systems, air conditioning and heating systems, and safety systems, etc.

[0051] In this embodiment, the electromagnetic interference test box 1 includes a test housing 11 and a low-voltage test component 12; the low-voltage test component 12 includes a low-voltage power supply interface 121, a communication interface 122, a low-voltage control module 123, and a low-voltage output interface 124; the low-voltage power supply interface 121, the communication interface 122, and the low-voltage output interface 124 are provided on the test housing 11; the low-voltage control module 123 is connected to the low-voltage power supply interface 121, the communication interface 122, and the low-voltage output interface 124, and based on the first control signal output by the communication interface 122, transmits the power supply signal output by the low-voltage power supply interface 121 to at least one low-voltage test device 4 connected to the low-voltage output interface 124, so that at least one low-voltage test device 4 operates to generate electromagnetic signals, thereby enabling power supply to any one or more low-voltage test devices separately, enabling electromagnetic interference testing of at least one operating low-voltage test device, accurately positioning the low-voltage test device, reducing the difficulty of electromagnetic interference testing, and improving the efficiency of electromagnetic interference testing.

[0052] In one embodiment, the low-voltage control module 123 includes a main control unit 1231 and a power distribution unit 1232; the input end of the main control unit 1231 is connected to the low-voltage power supply interface 121 and the communication interface 122, the output end of the main control unit 1231 is connected to the input end of the power distribution unit 1232, and the output end of the power distribution unit 1232 is connected to the low-voltage output interface 124.

[0053] As an example, the main control unit 1231 includes a voltage conversion circuit and a communication chip; the first end of the voltage conversion circuit is connected to the low-voltage power supply interface 121, the second end of the voltage conversion circuit is connected to the communication chip, and is used to perform voltage conversion on the power supply signal and provide a working voltage to the communication chip; the communication chip is connected to the communication interface and the power distribution unit 1232, and is used to transmit the first control signal to the power distribution unit 1232; the power distribution unit 1232 is also connected to the low-voltage power supply interface 121, and is used to transmit the power supply signal output by the low-voltage power supply interface 121 to at least one low-voltage test device 4 connected to the low-voltage output interface 124, so that at least one low-voltage test device 4 operates to generate electromagnetic signals.

[0054] As an example, the communication chip is a CAN chip, that is, a chip that supports the CAN bus protocol.

[0055] In this embodiment, when the electromagnetic interference test box 1 is powered on and working, the main control unit 1231 starts to work according to the power supply signal. When it is necessary to test the electromagnetic interference of low-voltage test devices, a first control signal is input to the communication interface 122 through the host computer. The main control unit 1231 controls the power distribution unit 1232 to transmit the power supply signal output by the low-voltage power supply interface 121 to at least one low-voltage test device 4 connected to the low-voltage output interface 124 according to the first control signal, so that at least one low-voltage test device 4 controlled by the first control signal works to generate electromagnetic signals, thereby improving the electromagnetic interference test efficiency.

[0056] In one embodiment, as Figure 3 shown, the power distribution unit 1232 includes a driving module 123a and a switching network 123b; the input end of the driving module 123a is connected to the output end of the main control unit 1231, the output end of the driving module 123a is connected to the input end of the switching network 123b, and the output end of the switching network 123b is connected to the low-voltage output interface 124.

[0057] As an example, the input end of the driving module 123a is also connected to the low-voltage power supply interface 121. The main control unit 1231 outputs a first control signal to the driving module 123a, and the driving module 123a drives the corresponding switch in the switching network 123b to conduct or disconnect, so that the power supply signal output by the low-voltage power supply interface 121 is transmitted to the low-voltage test device connected to the conducting switch through the conducting switch, so that the low-voltage test device works to generate electromagnetic signals. Thus, based on the first control signal, the switch in the switching network 123b is selected to conduct, so that the electromagnetic interference test of the low-voltage test device can be selectively performed, the accurate positioning of the low-voltage test device can be realized, the difficulty of the electromagnetic interference test can be reduced, and the electromagnetic interference test efficiency can be improved.

[0058] In one embodiment, the switching network 123b includes a plurality of switches arranged in parallel; the first end of each switch is connected to the output end of the driving module 123a, and the second end of each switch is used to connect a low-voltage test device through the low-voltage output interface 124.

[0059] Optionally, the switch can be a switching tube, a contactor or a relay.

[0060] As an example, the first end of each switch is connected to the output end of the driving module 123a and is connected to the low-voltage power supply interface 121 through the driving module 123a, so that after the switch conducts, the power supply signal output by the low-voltage power supply interface 121 can be transmitted to the corresponding low-voltage test device, so that the low-voltage test device works to generate electromagnetic signals. It can be understood that the control end of each switch is connected to the driving module 123a, and the driving module 123a drives each switch to conduct or disconnect according to the first control signal output by the main control unit 1231.

[0061] In one embodiment, the low-voltage control module 123 further includes a protection module 125; the input end of the protection module 125 is connected to the low-voltage power supply interface 121, and the output end of the protection module 125 is connected to the input end of the main control unit 1231.

[0062] In this embodiment, the input end of the protection module 125 is connected to the low-voltage power supply interface 121, and the output end of the protection module 125 is connected to the input end of the main control unit 1231, which is used to prevent the instantaneous large voltage of the low-voltage power supply interface 121 and filter the first control signal and the power supply signal to improve the reliability during the electromagnetic interference test.

[0063] In one embodiment, the electromagnetic interference test box 1 further includes a high-voltage test component 13; the high-voltage test component 13 includes a high-voltage power supply interface 131, a high-voltage control module 132, and a high-voltage output interface 133; the high-voltage power supply interface 131 and the high-voltage output interface 133 are arranged on the test housing 11; the high-voltage control module 132 is connected to the high-voltage power supply interface 131 and the high-voltage output interface 133, and is further used to connect to the signal transmission device 8, and based on the second control signal of the signal transmission device 8, transmit the power supply signal output by the high-voltage power supply interface 131 to at least one high-voltage test device 5 connected to the high-voltage output interface 133, so that at least one high-voltage test device 5 works to generate electromagnetic signals.

[0064] Among them, the signal transmission device 8 is a device for transmitting the second control signal. The second control signal is a control signal generated according to the first control signal. Exemplarily, the signal transmission device 8 is a CAN bus on the vehicle 101. The high-voltage test device is a test device that works at a non-safe voltage. Exemplarily, when the electromagnetic interference test box 1 is applied to the vehicle 101, the high-voltage test device includes a battery management system, an inverter, a motor, etc.

[0065] As an example, the high-voltage power supply interface 131 is used to connect to the power battery in the vehicle 101. The high-voltage control module 132 is connected to at least one high-voltage test device 5 through the high-voltage output interface 133, and is used to control at least one high-voltage test device 5 to work, so as to realize the electromagnetic interference test of the high-voltage test device.

[0066] As an example, the signal transmission device 8 is also used to be connected to the low-voltage test component 12. When it is necessary to control the operation of the high-voltage test device, the host computer outputs the first control signal corresponding to the high-voltage test device to the communication interface 122. The communication interface 122 is also connected to the signal transmission device 8. The main control unit 1231 in the low-voltage test component 12 outputs the second control signal to the signal transmission device 8 through the communication interface 122. The signal transmission device 8 transmits the second control signal to the high-voltage power supply interface 131. The high-voltage control module 132 can, based on the second control signal of the signal transmission device 8, transmit the power supply signal output from the high-voltage power supply interface 131 to at least one high-voltage test device 5 connected to the high-voltage output interface 133, so that at least one high-voltage test device 5 operates to generate an electromagnetic signal, realizing the electromagnetic interference test of the high-voltage test device.

[0067] In this embodiment, the electromagnetic interference test box 1 further includes a high-voltage test component 13, so that the electromagnetic interference test box 1 can simultaneously realize the electromagnetic interference test of the high-voltage test device and the low-voltage test device. At the same time, the high-voltage test component 13 receives the second control signal through the signal transmission device 8, and transmits the power supply signal output from the high-voltage power supply interface 131 to at least one high-voltage test device 5 connected to the high-voltage output interface 133, ensuring that the high-voltage test component 13 and the low-voltage test component 12 are isolated from each other to improve the safety of the electromagnetic interference test box 1.

[0068] In one embodiment, the electromagnetic interference test box 1 further includes an insulating structure 14; the insulating structure 14 is arranged in the test housing 11, dividing the test housing 11 into a first space and a second space; the low-voltage test component 12 is arranged in the first space, and the high-voltage test component 13 is arranged in the second space.

[0069] In this embodiment, by arranging the insulating structure 14 in the test housing 11, dividing the test housing 11 into a first space and a second space; the low-voltage test component 12 is arranged in the first space, and the high-voltage test component 13 is arranged in the second space, thus isolating the low-voltage test component 12 and the high-voltage test component 13 to prevent the low-voltage test component 12 and the high-voltage test component 13 from affecting each other and improving the safety of the electromagnetic interference test box 1.

[0070] This embodiment provides an electromagnetic interference test system, as Figure 3 and Figure 4 shown, including the above-mentioned electromagnetic interference test box 1, test control device 2 and signal test device 3; the test control device 2 is connected to the communication interface 122 and is used to output the first control signal; the signal test device 3 is used to collect the electromagnetic signals generated by at least one low-voltage test device 4 connected to the low-voltage output interface 124 and perform electromagnetic interference tests based on the electromagnetic signals.

[0071] In this embodiment, the user configures a first control signal through the signal testing device 3 to select a low-voltage testing device that needs to be subjected to electromagnetic interference testing. The electromagnetic interference testing box 1 receives the first control signal through the communication interface 122, controls the corresponding low-voltage testing device and / or high-voltage testing device to work to generate electromagnetic signals, and the signal testing device 3 collects the electromagnetic signals and conducts electromagnetic interference testing based on the electromagnetic signals. Thus, the electromagnetic interference testing box 1 can independently supply power to any one or more low-voltage testing devices 4, so that at least one working low-voltage testing device 4 can conduct electromagnetic interference testing, accurately locate the low-voltage testing device, reduce the difficulty of electromagnetic interference testing, and improve the efficiency of electromagnetic interference testing.

[0072] In one embodiment, the signal testing device 3 includes a receiving antenna 31 and a signal receiving device 32; the receiving antenna 31 is used to collect electromagnetic signals; the signal receiving device 32 is connected to the receiving antenna 31 and is used to conduct electromagnetic interference testing based on the electromagnetic signals.

[0073] As an example, according to actual requirements, determine the number and position of the receiving antenna 31, etc., so as to facilitate the normal collection of electromagnetic signals, and the signal receiving device 32 conducts electromagnetic interference testing on the electromagnetic signals. In this embodiment, the receiving antenna 31 is used to collect electromagnetic signals; the signal receiving device 32 is connected to the receiving antenna 31 and is used to conduct electromagnetic interference testing based on the electromagnetic signals, thereby realizing electromagnetic interference testing, with a simple structure and reduced cost.

[0074] In one embodiment, the electromagnetic interference testing box 1 is arranged on the vehicle 101; the vehicle 101 includes at least one low-voltage testing device 4 and at least one high-voltage testing device 5. The low-voltage power interface 121 is used to connect to the low-voltage battery 6 on the vehicle 101; the communication interface 122 is used to connect to the test control device 2 and the signal transmission device 8 on the vehicle 101; the low-voltage output interface 124 is used to connect to at least one low-voltage testing device 4 on the vehicle 101; the high-voltage power interface 131 of the electromagnetic interference testing box 1 is used to connect to the high-voltage battery 7 and the signal transmission device 8 on the vehicle 101; the voltage output interface of the electromagnetic interference testing box 1 is used to connect to at least one high-voltage testing device 5 on the vehicle 101; the signal testing device 3 is used to collect the electromagnetic signals generated by at least one low-voltage testing device 4 connected to the low-voltage output interface 124 and / or at least one high-voltage testing device 5 connected to the high-voltage output interface 133, and conduct electromagnetic interference testing based on the electromagnetic signals. Thus, the electromagnetic interference testing box 1 can independently supply power to any one or more low-voltage testing devices 4 and / or high-voltage testing devices 5, so that at least one working low-voltage testing device 4 and / or high-voltage testing device 5 can conduct electromagnetic interference testing, accurately locate the low-voltage testing device 4, reduce the difficulty of electromagnetic interference testing, and improve the efficiency of electromagnetic interference testing.

[0075] As an example, when the electromagnetic interference test box 1 is set on the vehicle 101 to conduct electromagnetic interference tests on the components and systems of the vehicle 101, the following methods can be adopted:

[0076] (1) Install the electromagnetic interference test box 1 on the vehicle 101 to replace the original vehicle 101 fuse box, that is, supply power to the vehicle electrical components instead of the vehicle's overall power supply, and ensure the realization of the functions of each system of the vehicle. The electromagnetic interference test box 1 can be one or more, and is selected according to the distribution of the vehicle's electrical components;

[0077] (2) Place the vehicle 101 installed with the electromagnetic interference test box 1 and the receiving antenna 31 in a specific test environment, such as an EMC laboratory. The receiving antenna 31 includes a first antenna and a second antenna. The first antenna and the second antenna are respectively placed on the left side and the right side of the vehicle 101 in sequence. The centers of the first antenna and the second antenna are directly opposite the center position of the entire vehicle 101. The closest distance from the receiving antenna 31 to the vehicle 101 is 10 m, and the height of the center of the receiving antenna 31 from the ground is 3.00 m ± 0.05 m. It can be understood that the setting of the receiving antenna 31 can be set according to actual needs and is not limited here.

[0078] (3) Set the vehicle 101 status through the signal test device 3, including the narrowband radiation emission working mode and the broadband radiation emission working mode;

[0079] The narrowband radiation emission working mode includes:

[0080] 1) For fuel vehicles: Turn the ignition switch to the "ON" position and the engine does not work; For pure electric vehicles, hybrid vehicles and hydrogen energy vehicles: The vehicle 101 is in the power-on ready state and in the P gear;

[0081] 2) The low-voltage test devices of the vehicle 101 are in the normal working state. For example, the position lights, front and rear fog lights, high and low beam headlights, and hazard warning lights are in the working state; The backlights of the combination instrument and the multimedia host screen are adjusted to the maximum brightness; The front windshield wiper works in the high speed gear; USB music playing mode, medium volume; The air conditioner works in the maximum wind speed of the cold air mode;

[0082] 3) All low-voltage test devices on the vehicle 101 with an internal clock greater than 9 kHz are in the normal working state.

[0083] The broadband radiation emission working mode includes:

[0084] 1) For fuel vehicles: The engine operates at normal temperature, the transmission is placed in the neutral position, and the engine speed is controlled at (1500 ± 150) r / min; for pure electric vehicles and hydrogen energy vehicles: Vehicle 101 operates at a speed of 40 km / h; for hybrid vehicles: If Vehicle 101 is equipped with both an independent motor drive and an internal combustion engine drive system, the drive systems should be tested separately. Vehicle 101 should be operated separately at a specified engine speed of (1500 ± 150) r / min under the drive of the internal combustion engine alone and at a speed of 40 km / h under the drive of the motor alone. If Vehicle 101 is equipped with a hybrid system, it should be tested under the simultaneous drive of the motor and the internal combustion engine with Vehicle 101 operating at a speed of 40 km / h. If not possible, Vehicle 101 should be operated separately at a speed of 40 km / h under the drive of the motor alone and at an engine speed of (1500 ± 150) r / min under the drive of the internal combustion engine alone.

[0085] 2) All low-voltage test devices and / or high-voltage test devices on Vehicle 101 that can generate broadband interference are in normal working condition. For example, the position lights, front and rear fog lights, high and low beam headlights, and hazard warning lights are in working condition; the backlights of the combination instrument and the multimedia host screen are adjusted to maximum brightness; the front windshield wiper operates in the high-speed gear; the USB music playback mode is in medium volume; the air conditioner operates in the lowest temperature and maximum wind speed in the cooling mode; all other electronic modules should be in the maximum load state.

[0086] (4) Conduct the vehicle's narrowband and broadband tests through the signal test device 3;

[0087] (5) Conduct the vehicle's EMI electromagnetic noise localization through the signal test device 3. If there are excessive points in the narrowband and broadband tests, the tester can send the first control signal from outside the EMC laboratory through the signal test device 3 to the electromagnetic interference test box 1 to control the state of Vehicle 101, such as controlling the simultaneous operation of a single component, a single system, or multiple systems, in order to conduct the vehicle's external radiation emission test and troubleshoot failure problems.

[0088] (6) Organize the collected electromagnetic signals and analyze the EMI electromagnetic noise intensity of each component or system of Vehicle 101 to provide an evaluation basis for the vehicle's self-compatibility risk.

[0089] In this embodiment, the electromagnetic interference test box 1 is arranged on the vehicle 101; the low-voltage power supply interface 121 is used to connect the low-voltage battery 6 on the vehicle 101; the communication interface 122 is used to connect the test control device 2 and the signal transmission device 8 on the vehicle 101; the low-voltage output interface 124 is used to connect at least one low-voltage test device 4 on the vehicle 101; the high-voltage power supply interface 131 is used to connect the high-voltage battery 7 and the signal transmission device 8 on the vehicle 101; the voltage output interface is used to connect at least one high-voltage test device 5 on the vehicle 101, and the following technical effects can be achieved:

[0090] 1. Through the electromagnetic interference test system, the relationship between the vehicle 101 EMI failure frequency band that cannot be observed subjectively and the vehicle controller or the vehicle system can be discovered in time, the test error caused by human factors can be reduced, and the test evaluation can be made more accurate.

[0091] 2. The electromagnetic interference test system provides a basis for locating the electrical components with vehicle EMI problems, can quickly locate the problem components, reduce the number of tests, reduce the cost of leasing laboratories, and shorten the R & D cycle.

[0092] 3. Improve the vehicle EMC performance development ability, improve the EMC forward development process, and change the development design process in which the EMC performance evaluation and control can only rely on first conducting component-level test verification and then vehicle-level test verification.

[0093] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An electromagnetic interference test box, characterized in that, It includes a test housing and a low-voltage test component; The low-voltage test component includes a low-voltage power interface, a communication interface, a low-voltage control module, and a low-voltage output interface; The low-voltage power interface, the communication interface, and the low-voltage output interface are arranged on the test housing; The low-voltage control module is connected to the low-voltage power interface, the communication interface, and the low-voltage output interface. Based on the first control signal output by the communication interface, it transmits the power supply signal output by the low-voltage power interface to at least one low-voltage test device connected to the low-voltage output interface, so that at least one of the low-voltage test devices works to generate an electromagnetic signal.

2. The electromagnetic interference test box according to claim 1, wherein The low-voltage control module includes a main control unit and a power distribution unit; The input end of the main control unit is connected to the low-voltage power interface and the communication interface, and the output end of the main control unit is connected to the input end of the power distribution unit, and is used to transmit the first control signal to the power distribution unit; The output end of the power distribution unit is connected to the low-voltage output interface, and is used to transmit the power supply signal to at least one low-voltage test device connected to the low-voltage output interface.

3. The electromagnetic interference test box according to claim 2, wherein The power distribution unit includes a driving module and a switching network; The input end of the driving module is connected to the output end of the main control unit, the output end of the driving module is connected to the input end of the switching network, and the output end of the switching network is connected to the low-voltage output interface; the driving module is used to drive the switching network to work according to the first control signal.

4. The electromagnetic interference test box according to claim 3, wherein, The switching network includes a plurality of switches arranged in parallel; the first end of each switch is connected to the output end of the driving module, and the second end of each switch is used to connect a low-voltage test device through the low-voltage output interface.

5. The electromagnetic interference test box according to claim 2, wherein, The low-voltage control module further includes a protection module; The input end of the protection module is connected to the low-voltage power interface, and the output end of the protection module is connected to the input end of the main control unit, and is used to filter the first control signal and / or the power supply signal.

6. The electromagnetic interference test box according to claim 1, characterized in that, It further includes a high-voltage test component; The high-voltage test component includes a high-voltage power interface, a high-voltage control module, and a high-voltage output interface; The high-voltage power interface and the high-voltage output interface are arranged on the test housing; The high-voltage control module is connected to the high-voltage power interface and the high-voltage output interface, and is further used to connect a signal transmission device. Based on the second control signal of the signal transmission device, it transmits the power supply signal output by the high-voltage power interface to at least one high-voltage test device connected to the high-voltage output interface, so that at least one of the high-voltage test devices works to generate an electromagnetic signal.

7. The electromagnetic interference test box according to claim 6, characterized in that, It further includes an insulating structure; the insulating structure is arranged inside the test housing and divides the test housing into a first space and a second space; The low-voltage test component is arranged in the first space, and the high-voltage test component is arranged in the second space.

8. An electromagnetic interference test system, characterized in that, It includes the electromagnetic interference test box, a test control device, and a signal test device according to any one of claims 1 to 7; The test control device is connected to the communication interface and is used to output a first control signal; The signal testing device is used to collect electromagnetic signals generated by at least one low-voltage testing device connected to the low-voltage output interface, and perform electromagnetic interference testing based on the electromagnetic signals.

9. The electromagnetic interference test system according to claim 8, wherein, The signal testing device includes a receiving antenna and a signal receiving device; The receiving antenna is used to collect the electromagnetic signals; The signal receiving device is connected to the receiving antenna and is used to perform electromagnetic interference testing based on the electromagnetic signals.

10. The electromagnetic interference test system according to claim 8, wherein, The electromagnetic interference testing box is arranged on the vehicle; the vehicle includes at least one low-voltage testing device and at least one high-voltage testing device; The low-voltage power supply interface is used to connect to the low-voltage battery on the vehicle; The communication interface is used to connect the test control device and the signal transmission device on the vehicle; The low-voltage output interface is used to connect at least one of the low-voltage testing devices; The high-voltage power supply interface of the electromagnetic interference testing box is used to connect to the high-voltage battery and the signal transmission device on the vehicle; the high-voltage output interface of the electromagnetic interference testing box is used to connect at least one of the high-voltage testing devices; The signal testing device is used to collect electromagnetic signals generated by at least one of the low-voltage testing devices connected to the low-voltage output interface and / or at least one of the high-voltage testing devices connected to the high-voltage output interface, and perform electromagnetic interference testing based on the electromagnetic signals.

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