CN114927267A - Anti-electromagnetic interference structure of sensor wire harness and vehicle cable system - Google Patents
Anti-electromagnetic interference structure of sensor wire harness and vehicle cable system Download PDFInfo
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- CN114927267A CN114927267A CN202210357504.3A CN202210357504A CN114927267A CN 114927267 A CN114927267 A CN 114927267A CN 202210357504 A CN202210357504 A CN 202210357504A CN 114927267 A CN114927267 A CN 114927267A
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- interference
- interference structure
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- 238000005253 cladding Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 230000008878 coupling Effects 0.000 abstract description 8
- 238000010168 coupling process Methods 0.000 abstract description 8
- 238000005859 coupling reaction Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/0207—Wire harnesses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0045—Cable-harnesses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses an anti-electromagnetic interference structure of a sensor wire harness and a vehicle cable system. Under the condition of not changing the hardware design of parts, a wiring harness processing mode for isolating coupling interference from system external wiring harnesses is provided for a system connected by only three wires, and the anti-interference effect of directly adopting a three-core shielding wire is realized by the design of lower cost.
Description
Technical Field
The invention relates to the technical field of shielded wires, in particular to an anti-electromagnetic interference structure of a sensor wire harness and a vehicle cable system.
Background
In the industry, the anti-electromagnetic interference treatment of the wire harness consisting of multiple wires basically adopts a mode of directly wrapping a shielding layer to realize the coupling and isolation effect of the system on interference, and the increased cost is higher. The mode of adopting the twisted pair with lower cost is only suitable for the wire group of partial circuit in the wire harness, and the integral anti-interference capability of the wire harness can not be improved; for example, a large number of sensors exist in a vehicle, a wiring harness group of the sensors consists of a signal line, a power supply positive line and a power supply negative line, the sensors adopt twisted-pair lines which are only suitable for the power supply positive line and the power supply negative line or between the signal line and the power supply negative line, and no anti-interference measure exists in the remaining one wire no matter the twisted-pair lines are applied to the group, so that the overall anti-interference effect is not ideal or completely ineffective.
Disclosure of Invention
The invention mainly aims to provide an anti-electromagnetic interference structure of a sensor wire harness and a vehicle cable system, so that interference is eliminated before entering a sensor or a controller, and the anti-electromagnetic interference performance of the system where the sensor is located is improved.
In order to achieve the above object, the present invention provides an anti-electromagnetic interference structure of a sensor harness, including:
the stranded wire structure comprises a power supply positive wire and a power supply negative wire which are stranded; and the number of the first and second groups,
the shielding wire, with the stranded conductor structure sets up side by side, the shielding wire includes an at least signal line and cladding the shielding layer of signal line surface outward, the both ends of shielding layer are connected to negative pole line and ground connection setting.
Optionally, the shielding layer is made of a metal film or a metal woven mesh.
Optionally, a buffer layer is disposed between the signal line and the shielding layer.
Optionally, the buffer layer is an insulating tape.
Optionally, the shielding wire is provided with a plurality of shielding layers, the two ends of each shielding layer of the shielding wire are arranged in a crimping manner, and the shielding layers of the shielding wire are connected to the negative electrode wire and are arranged in a grounding manner.
Optionally, the anti-electromagnetic interference structure of the sensor wire harness further includes an outer wrapping layer, and the outer wrapping layer wraps the outer surfaces of the stranded wire structure and the shielding wire.
Optionally, a buffer protection layer is arranged between the outer winding cladding and the stranded wire structure and the shielding wire.
The invention also provides a vehicle cable system, which comprises the anti-electromagnetic interference structure of the sensor wiring harness, wherein the anti-electromagnetic interference structure at least comprises:
the stranded wire structure comprises a power supply positive wire and a power supply negative wire which are stranded; and the number of the first and second groups,
the shielding wire, with the stranded conductor structure sets up side by side, the shielding wire includes an at least signal line and cladding the shielding layer of signal line surface outward, the both ends of shielding layer are connected to negative pole line and ground connection setting.
In the technical scheme of the invention, a design for eliminating interference coupled to a three-wire system sensor wire harness is provided, the wire harness design comprises a shielded wire, a twisted pair structure of a power supply positive wire and a power supply negative wire, and a shielding layer of the shielded wire is connected to the negative wire near connectors connecting two ends and is grounded to a vehicle body grounding position. Through the design, the interference is eliminated before entering the sensor or the controller, so that the anti-electromagnetic interference performance of a system where the sensor is located is improved. Therefore, under the condition of not changing the hardware design of the components, the anti-interference effect of directly adopting the three-core shielding wire is realized by the design with lower cost, the coupling interference from the external wire bundle of the system can be isolated, and the total cost of the structure is lower than the cost of directly adopting the three-core shielding wire.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art equivalent interference propagation path;
FIG. 2 is a schematic diagram of an embodiment of an anti-electromagnetic interference structure of a sensor harness according to the present invention;
fig. 3 is a schematic diagram of the effective interference propagation path in fig. 2.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indication is referred to in the embodiment of the present invention, the directional indication is only used for explaining a relative positional relationship, a motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the prior art, a common three-wire system wiring harness is taken as an example and consists of a signal wire, a power supply positive wire and a negative wire, and interference along the wiring harness bundled together with the system wiring harness can be caused on the signal wire, the negative wire, the power supply positive wire and a vehicle of the system due to the difference of bundling statesDifferent interference pressure differences are formed between the ground and enter the interior of the electric device through the wiring harness, and the electric device is interfered to different degrees. Please refer to fig. 1, U x For electromagnetic interference of the pressure difference formed between any cables, U y Differential pressure, Z, created for electromagnetic interference to the vehicle body ground LC In order to directly couple impedance of a wiring harness for propagating interference and an interfered wiring harness, capacitive reactance and inductive reactance are generally included, a solid arrow is differential mode interference current, the direction can be clockwise or anticlockwise, the interference current enters through one cable of the wiring harness for propagating interference and the wiring harness, and a U is formed between any two cables x The dotted arrow is the common mode interference current, U y The wiring harness interfered by the propagation is coupled with the system wiring harness (any cable or all cables) and flows to the vehicle body ground through the component ground and the like.
The invention provides an anti-electromagnetic interference structure of a sensor wire harness and a vehicle cable system, which improve the anti-electromagnetic interference capability of the system under the condition of not changing the design of electric device hardware (comprising an internal PCB and pins), and FIGS. 2 to 3 are embodiments of the anti-electromagnetic interference structure of the sensor wire harness provided by the invention.
Referring to fig. 2 to 3, the anti-electromagnetic interference structure 100 of the sensor harness includes a stranded wire structure and a shielding wire 2, the stranded wire structure includes a positive power supply wire 11 and a negative power supply wire 12 which are stranded, the shielding wire and the stranded wire structure are arranged side by side, the shielding wire 2 includes at least one signal wire 21 and a shielding layer 22 coated on an outer surface of the signal wire 21, and two ends of the shielding layer 22 are connected to the negative power supply wire 12 and are grounded.
In the technical scheme of the invention, a design for eliminating coupling interference on a three-wire sensor wire harness is provided, the wire harness design comprises a shielded wire 2, a twisted pair structure of a power supply positive wire 11 and a negative wire 12, and a shielding layer 22 of the shielded wire 2 is connected to the negative wire 12 near connectors connecting two ends and is grounded to a vehicle body ground. Through the design, the interference is eliminated before entering the sensor or the controller, so that the anti-electromagnetic interference performance of a system where the sensor is located is improved. Therefore, under the condition of not changing the hardware design of the components, the anti-interference effect of directly adopting the three-core shielding wire 2 is realized by the design with lower cost, and the coupling interference from the system external wire bundle can be isolated.
Specifically, please refer to FIG. 3, U x For electromagnetic interference, a voltage difference, U, is formed between the shielded wire 2 and the stranded wire structure y Differential pressure, Z, created for electromagnetic interference to the vehicle body ground LC In order to directly couple the interference-propagating wire harness and the interfered wire harness, the coupling impedance generally includes capacitive reactance and inductive reactance, the solid arrow is differential mode interference current, the direction can be clockwise or counterclockwise, the interference-propagating wire harness and the shielding wire 2 or one cable of the stranded wire structure enter, and a U-shaped coupling impedance is formed between the shielding wire 2 and the stranded wire structure x The dotted arrow is the common mode interference current, U y The wiring harness which propagates the interference is coupled into the shielding wire 2 or the stranded wire structure. The positive wire 11 and the negative wire 12 of the power supply are twisted and then matched with the shielding wire 2, interference coupled to the structure in a cable on a vehicle only has two conditions of interference pressure difference Uy formed by the shielding wire 2 and the twisted wire forming a paired vehicle body or interference pressure difference Uz formed between the shielding wire 2 and the twisted wire, and meanwhile, because the shielding layer 22 of the shielding wire 2 and the negative wire 12 are connected and connected with the vehicle body in parallel, and a path with enough low impedance is formed between the shielding layer 22 and the negative wire 12 or between the shielding layer 22 and the negative wire 12 and the vehicle body respectively, backflow is formed, so that interference caused by coupling when the wire harness is bundled together is prevented from entering the inside of a system electric device, and the structure is further improved in anti-electromagnetic interference capacity under the condition that the design of hardware of the system electric device is not changed.
In this embodiment, the shielding layer 22 is coated outside the single signal wire 21, the specific material of the shielding layer 22 is not limited in the present invention, and in an embodiment, the shielding layer 22 is made of a metal film or a metal mesh grid, that is, an insulating rubber sleeve is arranged outside the signal wire 21 and then the shielding layer made of a metal material is coated.
Furthermore, a buffer layer is arranged between the signal line 21 and the shielding layer 22, and the buffer layer with insulation can play a role in buffering and protecting the signal line 21 inside when the signal line is damaged by external force. It should be noted that, the present application does not limit the specific material of the buffer layer, and in an embodiment, the buffer layer is an insulating tape.
In addition, for the case that the number of the conducting wires is larger, that is, the shielding wire 2 is provided with a plurality of shielding layers, at this time, two ends of the shielding layer 22 of the plurality of shielding wires 2 are arranged in a compression joint manner, and the plurality of shielding layers 22 are all connected to the negative electrode wire 12 and are arranged in a grounding manner, so that the anti-interference effect can be also met. Further, on the basis of ensuring the three-wire system of the shield wire 2, the power supply positive wire 11 and the negative wire 12, the specific embodiment is as follows: the total number of the wires is n, the remaining n-3-m wires are replaced by the single-core shielding wires 2, all the shielding layers 22 are connected in a crimping mode and are simultaneously connected to the ground wires connected with the negative electrode wires 12 in the stranded wire structure, the final anti-interference effect is equivalent to that of the multi-core shielding wires 2, and the larger the number is, the greater the cost difference is.
In order to improve the overall protection effect of the wire harness, the anti-electromagnetic interference structure 100 of the sensor wire harness further comprises an outer wrapping layer, and the outer wrapping layer is wrapped on the outer surfaces of the stranded wire structure and the shielding wire 2. Thereby playing the guard action to inside three-wire system structure, increase of service life.
Moreover, a buffer protection layer is arranged between the outer winding cladding and the stranded wire structure and between the outer winding cladding and the shielding wire 2. The internal wiring harness structure is protected by buffering when damaged by external force. It should be noted that, the present application does not limit the specific material of the buffer protection layer, and the requirement of insulation, certain hardness, and partial low-grade external impact force may be satisfied.
The invention further provides a vehicle cable system, which comprises the anti-electromagnetic interference structure 100 of the sensor harness, and the vehicle cable system comprises all the technical characteristics of the anti-electromagnetic interference structure 100 of the sensor harness, so that the vehicle cable system also has the technical effects brought by all the technical characteristics, and the details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. An anti-electromagnetic interference structure of a sensor harness, comprising:
the stranded wire structure comprises a power supply positive wire and a power supply negative wire which are stranded; and (c) a second step of,
the shielding wire, with the stranded conductor structure sets up side by side, the shielding wire includes an at least signal line and cladding the shielding layer of signal line surface outward, the both ends of shielding layer all are connected to negative pole line and ground connection setting.
2. The anti-electromagnetic interference structure of a sensor harness according to claim 1, wherein the shielding layer is made of a metal film or a metal woven mesh.
3. The anti-electromagnetic interference structure of a sensor harness according to claim 1, wherein a buffer layer is provided between the signal line and the shielding layer.
4. The anti-electromagnetic interference structure of a sensor harness according to claim 3, wherein the buffer layer is an insulating tape.
5. The anti-electromagnetic interference structure of a sensor harness according to claim 1, wherein the plurality of shield wires are provided, the shield layers of the plurality of shield wires are crimped at both ends thereof, and the shield layers of the plurality of shield wires are connected to the negative electrode wire and grounded.
6. A vehicle cable system characterized by comprising the anti-electromagnetic interference structure of the sensor harness according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210357504.3A CN114927267B (en) | 2022-04-07 | 2022-04-07 | Anti-electromagnetic interference structure of sensor wire harness and vehicle cable system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210357504.3A CN114927267B (en) | 2022-04-07 | 2022-04-07 | Anti-electromagnetic interference structure of sensor wire harness and vehicle cable system |
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| CN114927267A true CN114927267A (en) | 2022-08-19 |
| CN114927267B CN114927267B (en) | 2024-10-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116207927A (en) * | 2023-05-05 | 2023-06-02 | 苏州苏磁智能科技有限公司 | Magnetic suspension motor and magnetic suspension equipment of twisted pair outgoing line |
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| CN101064387A (en) * | 2006-04-28 | 2007-10-31 | 鸿富锦精密工业（深圳）有限公司 | Transmission apparatus |
| JP2009214631A (en) * | 2008-03-07 | 2009-09-24 | Sumitomo Wiring Syst Ltd | Power supply connection structure of vehicular shielded line |
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| CN114927267B (en) | 2024-10-29 |
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