Wire-to-wire coupling immunity testing device

Abstract

The utility model discloses a line-to-line coupling immunity testing device, comprising a signal generating device used for providing a waveform signal for testing; the coupling device is connected with the signal generating device, the coupling device comprises a shell, the shell is provided with a channel in the length direction, the channel is provided with a communication port in the width direction, at least one end of the communication port extends to the edge of the shell, a coupling line is arranged in the channel in a penetrating mode, and the coupling line is connected with the signal generating device. The two ends of the coupling line penetrate out of the shell, one end of the coupling line is connected with the signal generation device, and the other end of the coupling line is connected with a test load; during testing, a to-be-tested wire harness passes through the channel from the communication port, so that the test section of the to-be-tested wire harness is disturbed by the signal of the coupling line. The testing device utilizes the coupling device to simulate the wiring harness arrangement condition in a real vehicle, utilizes the coupling line of the coupling device to interfere with the wiring harness to be tested of the sample, and realizes the line-to-line coupling immunity test.

Description

Technical Field

[0001] The utility model relates to the technical field of electric harassment testing caused by coupling, in particular to a line-to-line coupling immunity testing device structure. Background Technique

[0002] New energy vehicles are developing towards higher intelligence. The realization of intelligence requires the use of more in-vehicle devices such as sensors, radars, and cameras. The requirements for the electromagnetic compatibility of in-vehicle products are also getting higher and higher. The in-vehicle host needs a large data throughput. It collects, processes, and then outputs signals to each actuator. From a safety perspective, if the transmission of these signals is interfered with and not recognized or processed in time, it will affect the safety and reliability of autonomous driving.

[0003] In-vehicle devices will inevitably emit harassment signals during use, and these harassment signals will affect the operation of other in-vehicle devices through coupling. Therefore, during the process of the turn signal flashing at a fixed frequency, it is not allowed for other interference signals to be coupled to the turn signal power line to cause abnormal flashing. Or during the on-off process of the brake light, it is not allowed to be interfered by other interference signals coupled to the turn signal power line to avoid giving wrong signals to the outside. Such devices need to test their anti-interference ability before actual installation.

[0004] Most of the existing testing devices directly apply interference signals to the product to be tested, ignoring the fact that the wiring harnesses between in-vehicle devices will also interfere with each other. Signals are transmitted through the wiring harnesses, and when the wiring harnesses are interfered with, it will also affect the product functions. And the existing testing devices cannot restore the line-to-line coupling state. Therefore, it is urgent to design a line-to-line coupling immunity testing device. Content of the Utility Model

[0005] In order to overcome the defects in the prior art, the utility model provides a line-to-line coupling immunity testing device. The testing device uses a coupling device to simulate the wiring harness arrangement in a real vehicle, and uses the coupling wires of the coupling device to interfere with the wiring harness to be tested of the sample, so as to realize the line-to-line coupling immunity testing.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: a line-to-line coupling immunity testing device, including:

[0007] A signal generating device for providing a waveform signal for testing;

[0008] A coupling device, the coupling device is connected to the signal generating device, the coupling device comprises a shell, the shell is provided with a groove along its length direction, the groove is provided with a communication port along its width direction, at least one end of the communication port extends to the edge of the shell, a coupling line is passed through the groove, both ends of the coupling line pass through the shell, one end of the coupling line is connected to the signal generating device, and the other end of the coupling line is connected to a test load;

[0009] During testing, the wire harness to be tested is passed through the groove from the communication port, so that the test section of the wire harness to be tested is disturbed by the signal of the coupling line.

[0010] The test section is the portion of the wire harness to be tested of the sample that is bundled with other wire harnesses when actually mounted on the vehicle.

[0011] Through the above scheme, a coupling line is set in the shell to simulate the wiring harness arrangement in the actual vehicle, and the coupling line is used to interfere with the wiring harness of the sample to be tested to achieve line-to-line coupling immunity testing.

[0012] Furthermore, the housing is provided with at least three grooves along its length, and each groove is parallel to each other. The distance between the wire bundle to be tested and the coupling line can be adjusted by placing the wire bundle to be tested of the sample into different grooves.

[0013] Furthermore, the coupling line is arranged in the outermost groove, so as to maximize the adjustable range of the distance between the wire bundle to be tested of the sample and the coupling line.

[0014] Furthermore, it includes two communication ports, each of which connects the grooves, and the distance between the two communication ports is 100 cm ± 20 cm. The distance between the two communication ports is the length of the test section of the sample harness to be tested that is disturbed. When the harness is arranged in the actual vehicle, the length of the bundled harness is mostly between 80 cm and 120 cm.

[0015] Furthermore, a grounding device is included, and the coupling line is connected to the grounding device. Because the negative pole of the vehicle-mounted product is generally common, the test device is provided with a grounding device to simulate the actual vehicle state.

[0016] Furthermore, the coupling line is connected to an oscilloscope, and the output signal generated by the signal generating device is detected by the oscilloscope to ensure that it meets the test requirements.

[0017] Furthermore, the signal generating device includes a signal generator and a signal amplifier, an input end of the signal amplifier is connected to the signal generator, and the other end of the signal amplifier is connected to the coupling line.

[0018] Further, it includes a virtual artificial network which is arranged between the sample load and the power supply. During the test, one end of the wire harness to be tested is connected to the sample, and the other end is connected to the sample load. The virtual artificial network can isolate the signal at the power input end to avoid the signal of the power supply interfering with the operation of the sample load. Wherein, if the sample is a lighting adjustment system, the sample load is a lamp.

[0019] Further, the width of the channel is 0.6 cm ± 0.2 cm.

[0020] Further, it includes a monitoring device which is used to detect the operation of the sample load. If the sample load is a lamp, the monitoring device can be a luminous intensity tester.

[0021] By means of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0022] 1. In this application, by threading a coupling wire of sufficient length through the channel of the housing to simulate the wire harness layout mode in a real vehicle, using the coupling wire to interfere with the wire harness to be tested of the sample, and observing the operation of the sample load, the line-to-line coupling immunity test is realized;

[0023] 2. In this application, multiple channels are arranged on the housing, and by threading the wire harness to be tested of the sample into different channels, the distance between the wire harness to be tested and the coupling wire can be adjusted, and the operation is simple.

[0024] To make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the following specific preferred embodiments are given, and detailed descriptions are made in conjunction with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the overall device structure of the line-to-line coupling immunity test device in the embodiment of the present utility model;

[0027] Figure 2 It is a top view of the coupling device in the embodiment of the present utility model;

[0028] Figure 3 It is a side view of the coupling device in the embodiment of the present utility model.

[0029] Reference numerals in the above drawings: 1, signal generator; 2, signal amplifier; 3, coupling device; 31, housing; 311, channel; 312, communication port; 32, coupling wire; 4, sample; 41, wire harness to be measured; 42, sample load; 5, test load; 6, oscilloscope; 7, virtual artificial network; 8, grounding device; 9, monitoring device. Detailed implementation manners

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] Embodiment: As shown in Figures 1-3 a line-to-line coupling immunity test device is disclosed in this embodiment, including:

[0033] A signal generator 1, the output end of the signal generator 1 is connected to the input end of a signal amplifier 2, and the signal amplifier 2 is used to amplify the test signal output by the signal generator 1 so that the intensity of the test signal meets the test requirements.

[0034] The output end of the signal amplifier 2 is connected to a coupling device 3, and the coupling device 3 is used to receive the test signal amplified by the signal amplifier 2 and apply the test signal to the wire harness 41 to be measured.

[0035] In this embodiment, the coupling device 3 includes a housing 31 made of a non-metallic material. The housing 31 is 130.5 cm long, 15.2 cm wide, and 5.5 cm high. The housing 31 is provided with three juxtaposed channels 311 along its length direction. The channels are 120 cm long and 2.7 cm wide. A coupling wire 32 is threaded through the outermost channel 311. The coupling wire 32 can be a metal wire. The wire harness 41 to be tested is also threaded through the channel 311. Threading the wire harness 41 to be tested through different channels 311 can change the distance between the wire harness 41 to be tested and the coupling wire 32. Therefore, placing the coupling wire 32 in the outermost channel 311 can maximize the adjustable range of the distance between the wire harness 41 to be tested and the coupling wire 32. Both ends of the coupling wire 32 extend out from both ends of the housing 31 along its length direction. One end of the coupling wire 32 is connected to the output end of the signal amplifier 2, and the other end of the coupling wire 32 is connected to the test load 5. The channel 311 is provided with two juxtaposed communication ports 312 along its width direction. The two communication ports 312 are spaced 100 cm apart. Each communication port 312 connects the three channels 311, and both ends of the communication port 312 extend to the edge of the housing 31. The communication port 312 is 2.5 cm long. The wire harness 41 to be tested is inserted into the channel 311 through the two communication ports 312.

[0036] It should be noted that the distance between the two communication ports 312 is the length of the test section where the wire harness 41 to be tested of the sample 4 is interfered. The test section is the part where the wire harness 41 to be tested of the sample 4 is bundled with other wire harnesses during actual vehicle mounting. When arranging wire harnesses in a real vehicle, the lengths of the bundled wire harnesses are mostly between 80 cm and 120 cm. Therefore, in this embodiment, the interval between the two communication ports 312 is set to 100 cm.

[0037] Among them, the test load 5 is used to form a loop for the coupling wire 32. The test load 5 can be any in-vehicle product such as an in-vehicle lamp, and can further simulate the usage situation of in-vehicle products in a real vehicle.

[0038] Optionally, the channel 311 is provided with a plurality of the communication ports 312 along its width direction. By threading the wire harness 41 to be tested out from different communication ports 312, the length of the test section of the wire harness 41 to be tested can be adjusted.

[0039] Optionally, the line-to-line coupling immunity test device disclosed in this application includes a cover body. The cover body is disposed opposite to the side of the housing 31 where the channel 311 is provided, and the cover body can seal the side of the channel 311 and the communication port 312 facing away from the housing 31.

[0040] The coupling line 32 is connected to an oscilloscope 6. The oscilloscope 6 is connected to the coupling line 32 through a current clamp. The oscilloscope 6 can be used to detect the test signal received by the coupling line 32 to ensure that it meets the test requirements.

[0041] One end of the wire harness 41 to be tested is connected to the sample 4, and the other end of the wire harness 41 to be tested is connected to the sample load 42. A virtual artificial network 7 is provided between the sample load 42 and the power supply. The virtual artificial network 7 can isolate the signal at the power input end to avoid the signal of the power supply interfering with the operation of the sample load 42. Wherein, if the sample is a lighting adjustment system, the sample load is a lamp.

[0042] A grounding device 8 is connected below the housing 31, and the coupling line 32 is connected to the grounding device 8.

[0043] In another feasible embodiment, the line-to-line coupling immunity test device further includes a monitoring device 9 for detecting the operation of the sample load 42. For example, if the sample load 42 is a lamp, the monitoring device 9 can be a luminous intensity tester, and the luminous intensity tester determines whether it is interfered according to the brightness of the lamp.

[0044] During the test, the wire harness 41 to be tested is sequentially passed through the two communication ports 312 so that the test section of the wire harness 41 to be tested and the coupling line 32 are evenly arranged. The wire harness 41 to be tested of the sample 4 is placed in different channels 411, and the distance between the wire harness 41 to be tested and the coupling line 32 can be adjusted. It should be noted that the sample 4 is at least 20 cm away from the coupling device 3.

[0045] Through the above solution, a coupling line 32 is arranged in the housing 31 to simulate the wiring harness layout mode in a real vehicle. The coupling line 32 is used to interfere with the wire harness 41 to be tested of the sample 4, and whether it is interfered is judged by observing the operation of the sample load 42, so as to realize the line-to-line coupling immunity test.

[0046] The line-to-line coupling immunity test device disclosed in the present application can be combined with various pulse and signal generators. Various pulses and signals are coupled to the vehicle-mounted product wire harness through the wire harness. Various signal couplings can be simulated by changing the pulse and signal generators and the load. Various real vehicle states can also be simulated by the placement mode (distance, twisting, etc.) of the wire harness.

[0047] Specific embodiments are applied in the present utility model to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A line-to-line coupling immunity test device, characterized in that: include: A signal generating device, used for providing a waveform signal for testing; A coupling device, the coupling device is connected to the signal generating device, the coupling device comprises a shell, the shell is provided with a groove along its length direction, the groove is provided with a communication port along its width direction, at least one end of the communication port extends to the edge of the shell, a coupling line is passed through the groove, both ends of the coupling line pass through the shell, one end of the coupling line is connected to the signal generating device, and the other end of the coupling line is connected to a test load; During testing, the wire harness to be tested is passed through the groove from the connecting port, so that the test section of the wire harness to be tested is interfered by the signal of the coupling line.

2. The line-to-line coupling immunity test device according to claim 1, characterized in that: The shell is provided with at least three grooves along its length direction, and each groove is parallel to each other.

3. The line-to-line coupling immunity test device according to claim 2, characterized in that: The coupling line is arranged in the outermost slot.

4. The line-to-line coupling immunity test device according to claim 2, characterized in that: It comprises two communicating ports, each of which connects the grooves, and the distance between the two communicating ports is 100cm±20cm.

5. The line-to-line coupling immunity test device according to claim 1, characterized in that: A grounding device is included, and the coupling line is connected to the grounding device.

6. The line-to-line coupling immunity test device according to claim 1, characterized in that: The coupling line is connected with an oscilloscope.

7. The line-to-line coupling immunity test device according to claim 1, characterized in that: The signal generating device comprises a signal generator and a signal amplifier, the input end of the signal amplifier is connected to the signal generator, and the output end of the signal amplifier is connected to the coupling line.

8. The line-to-line coupling immunity test device according to claim 1, characterized in that: It comprises a virtual artificial network, which is arranged between a sample load and a power supply. During testing, one end of the wire harness to be tested is connected to the sample, and the other end of the wire harness to be tested is connected to the sample load.

9. The line-to-line coupling immunity test device according to claim 1, characterized in that: The width of the groove is 0.6 cm ± 0.2 cm.

10. The line-to-line coupling immunity test device according to claim 8, characterized in that: A monitoring device is included, and the monitoring device is used to detect the running condition of the sample load.

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