CN211374851U - Electromagnetic compatibility test shielding system for forward-looking camera of intelligent automobile - Google Patents
Electromagnetic compatibility test shielding system for forward-looking camera of intelligent automobile Download PDFInfo
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- CN211374851U CN211374851U CN201922273403.4U CN201922273403U CN211374851U CN 211374851 U CN211374851 U CN 211374851U CN 201922273403 U CN201922273403 U CN 201922273403U CN 211374851 U CN211374851 U CN 211374851U
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Abstract
The utility model discloses an intelligent automobile foresight camera electromagnetic compatibility test shielding system for the shielding of automobile foresight camera electromagnetic compatibility test. The vehicle-mounted projection screen comprises a shielding box, a projector, a projection screen and a power supply, wherein the power supply and the projector are arranged in the shielding box, and the projection screen is arranged in front of a vehicle; the shielding box comprises a metal box body and a metal upper cover; a cylindrical copper wire mesh is clamped between the metal box body and the metal upper cover, and a shielding glass assembly is arranged at the position of a lens opening of the projector; any side or sides of the metal box are provided with fan and waveguide window assemblies. The independent 220V power supply supplies power for the projector and the fan, the cylindrical copper wire mesh, the sealed copper wire mesh and the conductive cotton ensure a good shielding effect, the fan completes heat dissipation, the height and the angle of the instrument are adjusted by the side-tipping table top, and the function of the vehicle LDW is activated. The shielding box shields the anti-interference high-field-intensity signal to protect the projector, and can also shield the background noise of the anechoic chamber, which is influenced by the interference signal sent by the projector.
Description
Technical Field
The utility model relates to an intelligent automobile spare part electromagnetic compatibility test technique, the shielding system who uses when concretely relates to car forward-looking camera electromagnetic compatibility tests.
Background
Electromagnetic interference is an important problem which must be faced and overcome in the whole electronic field at present, and a shielding method is needed to finish testing, isolate interference signals and reduce interference influence in the testing process of general electronic equipment.
In the test evaluation of the intelligent automobile, the electromagnetic compatibility test is always an important item of the performance test of the intelligent automobile, the intelligent automobile is provided with electronic systems such as environment sensing, calculation, control, driving, communication and the like, the working safety of the intelligent automobile is closely related to the electromagnetic compatibility, and the reasonable and effective evaluation of the electromagnetic compatibility of the intelligent automobile is an important direction for guaranteeing the safe driving of the intelligent automobile.
The lane departure early warning LDW is a system for assisting a driver in reducing traffic accidents caused by lane departure in an alarming manner. The forward-looking system provides intelligent lane departure early warning LDW, and when the driver deviates from the original lane unconsciously (the driver does not turn the turn signal lamp), the driver can give an alarm before the lane deviates by 0.5 seconds, so that more reaction time is provided for the driver, the collision accidents caused by lane departure are greatly reduced, and in addition, the LDWS can be used for correcting the habit that the driver does not turn the turn signal lamp. Therefore, strict electromagnetic compatibility testing is required for the forward looking system-camera on the intelligent vehicle. The front-view camera needs to perform the electromagnetic compatibility test of the intelligent automobile under actual road conditions to be the best, but cannot actually perform the electromagnetic compatibility test. In order to simulate the actual road condition, the whole test is carried out in an anechoic chamber on the premise of not introducing external electromagnetic interference. A projector is needed during simulation test, and the projector generates electromagnetic interference to the outside during interference emission test, so that the background noise of an anechoic chamber is influenced; the projector is also damaged by high field intensity signals emitted by the radiation antenna of the test equipment in the anti-interference emission test process, so that a set of electromagnetic shielding system needs to be manufactured to protect the safety of the electromagnetic compatibility test environment and the projector.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned prior art not enough, the utility model provides an intelligent vehicle forward-looking camera electromagnetic compatibility tests shielding system, the problem that the projecting apparatus produced electromagnetic interference and influences anechoic chamber background noise when having solved the interference emission test, and high field intensity signal can damage the problem of projecting apparatus when having solved the interference emission test, has solved the interactive problem of video signal between projecting apparatus and the intelligent vehicle forward-looking camera in the shielded cell.
The utility model discloses the technical scheme who takes as follows: an electromagnetic compatibility test shielding system for a front-view camera of an intelligent automobile comprises a shielding box, a projector, a projection screen and a power supply, wherein the power supply and the projector are arranged in the shielding box, and the projection screen is arranged in front of the automobile; the shielding box comprises a metal box body and a metal upper cover; the upper edge of the metal box body is stepped, a circle of cylindrical copper wire mesh is placed on the lower stepped surface and surrounds the box body, a fastening device is arranged on the upper stepped surface, the metal upper cover is pressed on the metal box body through the fastening device, and the cylindrical copper wire mesh is clamped between the metal box body and the metal upper cover; a shielding glass assembly is arranged at the position of the side surface of the metal box body, which is opposite to the projector lens opening; and a fan is arranged on any side surface or multiple side surfaces of the metal box body, and a waveguide window assembly is arranged at the fan.
Furthermore, the fastening device is an assembly of a connecting piece and a bolt, the connecting piece is welded on the metal box body, and the bolt penetrates through the connecting piece and is pressed on the metal upper cover.
Further, the shielding glass component is composed of a steel plate, a conductive cotton sliver, shielding glass and a bolt; the middle of the steel plate is provided with a hole, and bolt holes are arranged around the hole; the metal box body is provided with a hole, and bolt holes are arranged around the hole; the conductive cotton strip is clamped between the steel plate and the shielding glass, the steel plate, the shielding glass, the conductive cotton strip and the shielding glass are attached to the metal box body, and the steel plate and the metal box body are connected through the bolt.
Furthermore, the waveguide window assembly is composed of a waveguide window, a sealing copper mesh and a bolt, a bolt hole is formed in the waveguide window, a bolt hole is formed in the metal box body, the sealing copper mesh is clamped between the waveguide window and the metal box body, and the bolt is connected with the waveguide window and the metal box body.
Further, the waveguide window is position-mounted with a fan.
Further, the shielding system further includes a side stand supported below the shielding cage.
The beneficial effects of the utility model are embodied in:
first, the utility model discloses simple structure, experimental environment builds the convenience, and is easy and simple to handle, and single can accomplish whole operations.
Secondly, the electromagnetic environment is not influenced, and the anti-interference capability of the system is strong.
Third, the shielding effectiveness of the shielding box: when the analog interference source is arranged outside the shielding box, the ratio of the electric field intensity, the magnetic field intensity or the power of a certain point in space before and after the shielding box is arranged is logarithmized, and the unit is expressed by dB. The utility model discloses the shielded cell has good conductive continuity, and has very good shielding effectiveness, can reach more than 25 dB.
Fourthly, the shielding glass and the waveguide window are additionally provided with conductive cotton or a sealing copper net, and the copper net is additionally arranged between the box body and the upper cover to strengthen shielding.
Fifth, its conductive continuity is guaranteed in the shielded cell design, guarantees the surface finish and the contact compactness of product, the utility model discloses a panel beating welded mode for whole shielded cell reaches the good purpose of contact, and the interference signal that inside projecting apparatus of shielded cell and the independent 220V power supply unit equipment of projecting apparatus sent can be shielded the shell reflection, can not cause the influence to the experimental environment in the anechoic chamber.
Sixth, the system is provided with a side-tipping platform which can move at any time, is convenient to enter and exit the anechoic chamber, can adjust the height and the definition of an image emitted by the projector, and is convenient to adjust the height, the size and the definition of the image. The projector shielding box can be accurately aligned with a front-view system-camera (applicable to various vehicles) of the intelligent automobile.
And seventhly, a layer of wave-absorbing material with the thickness of 2cm is adhered to one side, facing the vehicle, of the shielding box, so that the situation that the vehicle mistakenly recognizes that an obstacle exists in the front of the vehicle and cannot reach the required vehicle speed during testing is prevented.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
FIG. 1: is a schematic structural diagram of the shielding box of the utility model;
FIG. 2: the metal box body and the metal upper cover are disassembled;
FIG. 3: the upper edge of the metal box body is sealed schematically;
FIG. 4: a waveguide window assembly installation schematic;
FIG. 5: a shielding glass assembly installation schematic diagram;
FIG. 6: a movable roll stand schematic;
FIG. 7: electromagnetic compatibility test schematic diagram of a front-view camera of an intelligent automobile.
In the figure, 1-shielded box, 2-projector, 3-projection screen, 4-power supply, 5-side stand, 11-metal box, 12-metal top cover, 13-shielding glass component, 14-fan, 15-waveguide window component, 16-cylindrical copper wire mesh, 17-fastening device, 18-supporting and fixing clamp, 131-steel plate, 132-conductive sliver, 133-shielding glass, 134-bolt, 151-waveguide window, 152-sealed copper mesh, 153-bolt.
Detailed Description
The invention will be described in detail with reference to the following drawings, which form a part hereof, and an embodiment, and which together with the embodiment illustrate the invention. However, it should be understood by those skilled in the art that the following examples are not intended to limit the technical solutions of the present invention, and all equivalent changes or modifications made in the spirit of the technical solutions of the present invention should be considered as falling within the protection scope of the present invention.
As shown in fig. 1, the shield system main body includes a shield case 1, a projector 2 is placed in the shield case 1, and a projection screen 3 is placed outside the shield case 1 and in front of the projection of the projector 2. During test, the intelligent automobile with the test camera and the whole shielding system enter an anechoic chamber, and the test is carried out in the anechoic chamber. The shielding system is mainly used for establishing shielding between the projector 2 and the external environment, so that the electromagnetic compatibility test of the automobile front-view camera is carried out in an interference-free environment.
The structure of the shielding box 1 is shown in fig. 2, and includes a metal box body 11, and a metal upper cover 12 is disposed on the metal box body 11, and the metal upper cover 12 can be opened or closed. The projector 2 and the power supply 4 are arranged in the metal box body 11; a shielding glass component 13 is arranged at the position of the side surface of the metal box body 1, which is opposite to the projection lens opening of the projector 2; a fan 14 is further provided on any one side or more sides of the metal case 1, and a waveguide window assembly 15 is installed at the fan for sealing and isolating to prevent electromagnetic wave leakage.
As shown in fig. 3, in order to ensure the shielding effect, the upper edge of the metal case 11 is designed as a stepped upper edge, a cylindrical copper wire mesh 16 is provided around the case on the lower stepped surface, and a fastening device 17 is provided on the upper stepped surface. When the cover is covered, the metal upper cover 12 is buckled on the cylindrical copper wire mesh 16, the cylindrical copper wire mesh 16 is clamped between the metal box body 11 and the metal upper cover 12, and the fastening device 17 is used for pressing, so that the metal box body 11, the metal upper cover 12 and the cylindrical copper wire mesh 16 are in good contact, a connecting gap is reduced, and the integral shielding effect of the shielding box is ensured.
Further, the fastening device 17 is a combination of a connecting member welded to the metal case 11 and a bolt hole formed in the connecting member, and the bolt is connected to the connecting member, and when the metal upper cover 12 is pressed, the bolt is tightened downward to abut against the metal upper cover 12.
Further, the projector 2 and the power supply 4 are fixed in the metal case 11 by the supporting and fixing jig 18, ensuring stability when the shielding case is moved or adjusted in height.
The shielding glass and the waveguide window belong to shielding equipment, because the gap or the hole can possibly generate electromagnetic wave leakage, and whether the leakage depends on the size of the gap or the hole relative to the wavelength of the electromagnetic wave, when the shielding glass and the waveguide window are installed on a box body, the shielding glass and the waveguide window are required to be tightly connected, the metal box body and the waveguide window can be perfectly connected by using a sealing copper net (or a shielding conductive gasket), and the metal box body and the shielding glass can be perfectly connected by using conductive cotton, so that the integral shielding efficiency of the shielding box is ensured.
As shown in fig. 4, the shielding glass is a transparent shielding device for preventing electromagnetic radiation and electromagnetic interference, relates to optics, electrics, metal materials, chemical raw materials, glass, machinery and the like, is widely used in the field of electromagnetic compatibility, attenuates electromagnetic interference, does not distort various observed images (including dynamic color images) and has the characteristics of high fidelity and high definition. The shielding glass component 13 is additionally provided with a conductive cotton sliver and consists of a steel plate 131, a conductive cotton sliver 132, shielding glass 133 and bolts 134, wherein the middle of the steel plate 131 is provided with a large hole, and the periphery of the steel plate is provided with bolt holes. When the conductive glass is installed, the steel plate is polished, the conductive silver 132 is clamped between the steel plate 131 and the shielding glass 133, the conductive silver 132 is arranged at the edge of the shielding glass 133, the steel plate 131 and the metal box 11 are tightly attached to each other (the box is also provided with a large hole and a bolt hole in advance), then the steel plate 131 and the metal box 11 are connected through the bolt 134, the shielding glass 133 and the conductive silver 132 are clamped, and the shielding glass 133 transmits light through the large hole.
As shown in fig. 5, the waveguide window is used to shield the electromagnetic wave by using the principle of waveguide high-pass filtering, that is, the waveguide passes the electromagnetic wave above the cutoff frequency and attenuates the electromagnetic wave below the cutoff frequency, and the attenuation (shielding effectiveness) is proportional to the length of the waveguide. The waveguide window assembly 15 is additionally provided with a sealing copper mesh, and consists of a waveguide window 151, a sealing copper mesh 152 and a bolt 153. When the waveguide window is installed, the copper sealing mesh 152 is clamped between the waveguide window 151 and the metal box 11 and then fastened by bolts.
Further, the projector 2 needs the independent 220V power supply 4 to supply power, and the projector 2 and the independent 220V power supply 4 generate heat during operation, so that a waveguide window and a USB power supply ventilation fan are needed to dissipate heat. The fan 14 is mounted in the interior of the housing at the waveguide window.
Further, the metal box 11 and the metal upper cover 12 are both made of stainless steel, and the thickness of the metal steel plate is as follows: 1.5mm, and the welding mode is argon arc welding precision welding.
Further, the system is provided with a roll stand 5, shown in fig. 6, supported below the shielding cage 1, which can raise the shielding cage 1 and provide a certain pitch angle.
When a forward-looking camera electromagnetic compatibility test is carried out, a debugged projector 2 is placed into a movable shielding box 1, whether a cooling fan of a projector and a projector power supply corresponds to a vent of the shielding box or not is checked, whether a lens of the projector corresponds to shielding glass or not is checked, the power supply is used for supplying power to the projector, a video image is displayed on a projection screen through the shielding glass after the equipment is opened, and a metal upper cover is closed after the image is normal. The recorded actual road condition video is played by the projector 2, is displayed on the projection screen 3 through the shielding glass, and in order to meet the requirement that the video image played by the projector 2 is in butt joint with the front-view camera of the intelligent automobile, the height and the angle of the side-tipping platform can be adjusted, the LDW function of the automobile is activated, and the test is carried out, as shown in fig. 7.
Claims (6)
1. The utility model provides an intelligent automobile forward-looking camera electromagnetic compatibility test shielding system which characterized in that: the vehicle-mounted projection screen comprises a shielding box, a projector, a projection screen and a power supply, wherein the power supply and the projector are arranged in the shielding box, and the projection screen is arranged in front of a vehicle;
the shielding box comprises a metal box body and a metal upper cover; the upper edge of the metal box body is stepped, a circle of cylindrical copper wire mesh is placed on the lower stepped surface and surrounds the box body, a fastening device is arranged on the upper stepped surface, the metal upper cover is pressed on the metal box body through the fastening device, and the cylindrical copper wire mesh is clamped between the metal box body and the metal upper cover;
a shielding glass assembly is arranged at the position of the side surface of the metal box body, which is opposite to the projector lens opening; and a fan is arranged on any side surface or multiple side surfaces of the metal box body, and a waveguide window assembly is arranged at the fan.
2. The intelligent automotive forward-looking camera electromagnetic compatibility test shielding system according to claim 1, wherein: the fastening device is an assembly of a connecting piece and a bolt, the connecting piece is welded on the metal box body, and the bolt penetrates through the connecting piece and is pressed on the metal upper cover.
3. The intelligent automotive forward-looking camera electromagnetic compatibility test shielding system according to claim 1, wherein: the shielding glass component consists of a steel plate, a conductive cotton sliver, shielding glass and a bolt; the middle of the steel plate is provided with a hole, and bolt holes are arranged around the hole; the metal box body is provided with a hole, and bolt holes are arranged around the hole; the conductive cotton strip is clamped between the steel plate and the shielding glass, the steel plate, the shielding glass, the conductive cotton strip and the shielding glass are attached to the metal box body, and the steel plate and the metal box body are connected through the bolt.
4. The intelligent automotive forward-looking camera electromagnetic compatibility test shielding system according to claim 1, wherein: the waveguide window assembly is composed of a waveguide window, a sealing copper mesh and a bolt, a bolt hole is formed in the waveguide window, a bolt hole is formed in the metal box body, the sealing copper mesh is clamped between the waveguide window and the metal box body, and the bolt is connected with the waveguide window and the metal box body.
5. The intelligent automotive forward-looking camera electromagnetic compatibility test shielding system according to claim 4, wherein: and a fan is arranged at the waveguide window.
6. The intelligent automotive forward-looking camera electromagnetic compatibility test shielding system according to claim 1, wherein: the shielding system further includes a side stand supported below the shielding cage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922273403.4U CN211374851U (en) | 2019-12-18 | 2019-12-18 | Electromagnetic compatibility test shielding system for forward-looking camera of intelligent automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922273403.4U CN211374851U (en) | 2019-12-18 | 2019-12-18 | Electromagnetic compatibility test shielding system for forward-looking camera of intelligent automobile |
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| CN211374851U true CN211374851U (en) | 2020-08-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219269A (en) * | 2021-03-30 | 2021-08-06 | 一汽奔腾轿车有限公司 | Electromagnetic compatibility testing system and method for high-voltage PTC heating system of electric vehicle |
| CN115951158A (en) * | 2023-03-13 | 2023-04-11 | 中国汽车技术研究中心有限公司 | Device and method for testing electromagnetic immunity of electronic rearview mirror and storage medium |
| CN116774503A (en) * | 2023-06-25 | 2023-09-19 | 深圳紫晶光电科技有限公司 | Intelligent projector inclination angle self-adaptive system |
-
2019
- 2019-12-18 CN CN201922273403.4U patent/CN211374851U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219269A (en) * | 2021-03-30 | 2021-08-06 | 一汽奔腾轿车有限公司 | Electromagnetic compatibility testing system and method for high-voltage PTC heating system of electric vehicle |
| CN115951158A (en) * | 2023-03-13 | 2023-04-11 | 中国汽车技术研究中心有限公司 | Device and method for testing electromagnetic immunity of electronic rearview mirror and storage medium |
| CN116774503A (en) * | 2023-06-25 | 2023-09-19 | 深圳紫晶光电科技有限公司 | Intelligent projector inclination angle self-adaptive system |
| CN116774503B (en) * | 2023-06-25 | 2024-02-02 | 深圳紫晶光电科技有限公司 | Intelligent projector inclination angle self-adaptive system |
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