CN107247210A - A kind of vehicle EMC earth faults investigate method and system - Google Patents
A kind of vehicle EMC earth faults investigate method and system Download PDFInfo
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- CN107247210A CN107247210A CN201710686741.3A CN201710686741A CN107247210A CN 107247210 A CN107247210 A CN 107247210A CN 201710686741 A CN201710686741 A CN 201710686741A CN 107247210 A CN107247210 A CN 107247210A
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- line length
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention provides a kind of vehicle EMC earth faults investigation method and system, and this method includes：Spectrum scan is carried out to the vehicle of operation using investigation method, localized spectroscopy peak value is more than the risk parts of given threshold.Detect whether the electromagnetic radiation of the risk parts is qualified, if it is, into earthed circuit malfunction elimination.Detect the working frequency and ground connection line length of earthed circuit.If the working frequency of single-point grounding circuit is less than first frequency threshold value, and the ground connection line length is more than λ/4, then is ground connection line length failure, wherein, λ is electromagnetic radiation wavelength.The present invention can improve the security and antijamming capability of finished vehicle electronic system.
Description
Technical field
The present invention relates to automotive electronics detection technique field, more particularly to a kind of vehicle EMC earth faults investigation method and
System.
Background technology
Hyundai Motor technical field, more and more using the various electronic controllers based on microprocessor.But automobile
Electromagnetic environment than general industry electronics applications bad environments much, therefore have higher anti-to automobile controller product
The requirement of electromagnetic interference, generally in Auto Electronic Controlled System, the measure of electromagnetism interference have filtering technique, shield technology and
Software digital filter and blipology.The integrated use of these technologies effectively solves the electromagnetic compatibility of automobile controller
Integrity problem, but vehicle electromagnetic compatibility (EMC, Electro Magnetic Compatibility) is a system engineering, is needed
The cooperation of each parts is wanted, once mismate, it is possible to cause the matching problem between each several part.It is used as contact each several part
Bridge, the quality of ground connection is even more most important, and ground contact length also needs consideration, if grounding is bad, not only can will be originally
Less noise further amplifies, it is also possible to involve the problems such as other EMC are anti-interference.
The content of the invention
The present invention provides a kind of vehicle EMC earth faults investigation method and system, solves the earthed circuit pair of existing vehicle
Vehicle electromagnetic compatibility is anti-interference to produce noise, the problem of influenceing sensitivity and the antijamming capability of automobile controller, can carry
The security and antijamming capability of high finished vehicle electronic system.
To realize object above, the present invention provides following technical scheme：
A kind of vehicle EMC earth faults investigate method, including：
Spectrum scan is carried out to the vehicle of operation using investigation method, localized spectroscopy peak value is more than the risk zero of given threshold
Part；
Detect whether the electromagnetic radiation of the risk parts is qualified, if it is, into earthed circuit malfunction elimination；
Detect the working frequency and ground connection line length of earthed circuit；
If the working frequency of single-point grounding circuit is less than first frequency threshold value, and the ground connection line length is more than λ/4, then
To be grounded line length failure, wherein, λ is electromagnetic radiation antenna wavelength.
It is preferred that, in addition to：
When the working frequency of single-point grounding circuit is more than the first frequency threshold value and is less than second frequency threshold value, if
It is grounded line length and is more than λ/20, then is ground connection line length failure.
It is preferred that, in addition to：
The common ground impedance of single-point grounding circuit is detected, if the impedance altogether is more than setting impedance threshold, it is determined that connect
Ground circuit produces impedance coupled interference altogether, is earthing mode failure.
It is preferred that, in addition to：
The working frequency of multipoint earthing circuit is detected, is more than second frequency threshold in the working frequency of the multipoint earthing circuit
During value, if ground connection line length is more than λ/20, for ground connection line length failure.
It is preferred that, in addition to：
The voltage of the common ground impedance of multipoint earthing circuit is detected, judges to whether there is ground voltage between the impedance altogether,
If it is present being ground wire connecting fault.
It is preferred that, the first frequency threshold value 1MHz, the second frequency threshold value is 10MHz.
The present invention also provides a kind of vehicle EMC earth fault Check Systems, including：
Frequency spectrum detection unit, carries out spectrum scan, and export the spectrum value that scanning is obtained for the vehicle to operation；
Risk parts detection unit, for the spectrum value exported according to the frequency spectrum detection unit, determines spectrum peak
More than the risk parts of given threshold；
Electromagnet radiation detection unit, for detecting whether the electromagnetic radiation of the risk parts is qualified；
Earth Fault Detection unit, in the case where the electromagnetic radiation of the risk parts is qualified, detection to be grounded
The working frequency and ground connection line length of circuit；And the working frequency of the single-point grounding circuit in detection is less than first frequency threshold
Value, and the ground connection line length of the single-point grounding circuit is when being more than λ/4, it is determined that ground connection line length failure, wherein, λ is electromagnetism spoke
Penetrate antenna wavelength.
It is preferred that, in addition to：
The working frequency of the single-point grounding circuit detected in the Earth Fault Detection unit is more than the first frequency threshold
Value and less than second frequency threshold value, and the ground connection line length, when being more than λ/20, the Earth Fault Detection unit determines ground connection
Line length failure.
It is preferred that, the Earth Fault Detection unit is additionally operable to detect the common ground impedance of earthed circuit；And detecting
When the impedance altogether is more than setting impedance threshold, determine that earthed circuit produces impedance coupled interference altogether, be earthing mode event
Barrier.
It is preferred that, the Earth Fault Detection unit is additionally operable to detect the voltage of the common ground impedance of earthed circuit；And
The working frequency that the Earth Fault Detection unit detects multipoint earthing circuit is more than second frequency threshold value, and the multiple spot connects
When the ground connection line length of ground circuit is more than λ/20, it is determined that ground connection line length failure；
When the voltage for detecting the impedance altogether is more than voltage threshold, determine that earthed circuit has ground loop electricity
Stream, is ground wire connecting fault.
The present invention provides a kind of vehicle EMC earth faults investigation method and system, passes through the working frequency to earthed circuit
Detected with earthing mode, different earthing modes is used using in different working frequencies, to solve connecing for existing vehicle
Ground circuit is anti-interference to vehicle electromagnetic compatibility to produce noise, can influence the sensitivity of automobile controller and asking for antijamming capability
Topic, can improve the security and antijamming capability of finished vehicle electronic system.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the present invention, the required accompanying drawing used in embodiment will be made below
Simply introduce.
Fig. 1：A kind of vehicle EMC earth faults investigation method schematic diagram that the present invention is provided；
Fig. 2：It is series connection single-point ground structure schematic diagram provided in an embodiment of the present invention；
Fig. 3：It is single-point grounding structural representation in parallel provided in an embodiment of the present invention；
Fig. 4：It is multipoint earthing structural representation provided in an embodiment of the present invention.
Embodiment
In order that those skilled in the art more fully understand the scheme of the embodiment of the present invention, below in conjunction with the accompanying drawings and implement
Mode is described in further detail to the embodiment of the present invention.
The noise produced for current vehicle Electro Magnetic Compatibility, earthed circuit, can influence the jamproof problem of vehicle, this
Invention provides a kind of vehicle EMC earth faults investigation method and system, passes through the working frequency and earthing mode to earthed circuit
Detected, different earthing modes is used using in different working frequencies, to solve the earthed circuit of existing vehicle to whole
Car electromagnetic compatibility is anti-interference to produce noise, the problem of influenceing sensitivity and the antijamming capability of automobile controller, can improve
The security and antijamming capability of finished vehicle electronic system.
As shown in figure 1, a kind of vehicle EMC earth faults investigation method, comprises the following steps：
S1：Spectrum scan is carried out to the vehicle of operation using investigation method, localized spectroscopy peak value is more than the risk of given threshold
Parts；
S2：Detect whether the electromagnetic radiation of the risk parts is qualified, if it is, being arranged into earthed circuit failure
Look into；
S3:Detect the working frequency and ground connection line length of earthed circuit；
S4：If the working frequency of single-point grounding circuit be less than first frequency threshold value, and it is described ground connection line length be more than λ/
4, then it is ground connection line length failure, wherein, λ is electromagnetic radiation antenna wavelength.
Further, in addition to：
S5：When the working frequency of single-point grounding circuit is more than the first frequency threshold value and is less than second frequency threshold value,
If being grounded line length is more than λ/20, for ground connection line length failure.
Further, in addition to：
S6：The common ground impedance of single-point grounding circuit is detected, if the impedance altogether is more than setting impedance threshold, it is determined that
Earthed circuit produces impedance coupled interference altogether, is earthing mode failure；
If earthing mode is series connection single-point ground structure, need to be changed to single-point grounding structure in parallel.
This method also includes：
S7：The working frequency of multipoint earthing circuit is detected, is more than the second frequency in the working frequency of the multipoint earthing circuit
During rate threshold value, if ground connection line length is more than λ/20, for ground connection line length failure.
This method also includes：
S8：The voltage of the common ground impedance of multipoint earthing circuit is detected, judges to whether there is ground electricity between the impedance altogether
Pressure, if it is present being ground wire connecting fault, needs overstriking ground wire or using bus-bar connection.
Further, the first frequency threshold value 1MHz, the second frequency threshold value is 10MHz.
In actual applications, earthing mode of the electronic equipment on vehicle is divided into two kinds of single-point grounding and multipoint earthing.It is single
Point ground connection refers to that in a circuit system ground wire of all circuits is connected to the same point of common ground.Single-point grounding is divided into again
Series connection single-point ground structure (as shown in Figure 2) and single-point grounding structure (as shown in Figure 3) in parallel.In the system of series connection single-point grounding
In, when the earth-current of two circuits flows through a common impedance, common ground impedance coupler is just there occurs, therefore use single-point grounding
Shi Jinliang is using single-point grounding structure in parallel, it is to avoid the interference that impedance coupler is caused altogether.
As shown in figure 4, multipoint earthing structure refers in a circuit system, all circuits are all connected to a ground connection flat board
On, there are multiple earth points.In the system of multipoint earthing, because each earth point Potential distribution is uneven, between different earth points
There is epd, form the ground loop currents of " circuit 1- interconnection cables-circuit 2- ", ground loop currents are in ground connection
Ground voltage is generated between the common ground impedance that point is formed, the ground voltage is applied directly on circuit become common mode disturbance voltage.For
Present in multipoint earthing system loop problem, it is necessary to which by overstriking ground wire, ground connection (requires the length of often piece-root grafting ground wire nearby
Degree less than signal wavelength 1/20), copper foil or bus-bar ground connection (increase contact area) etc. means reduce grounding wire impedance, shorten electricity
Loop area is flowed, interference is brought to reduce ground loop.
It can be seen that, the present invention provides a kind of vehicle EMC earth faults investigation method, by the working frequency to earthed circuit and
Earthing mode is detected, different earthing modes is used using in different working frequencies, to solve the ground connection of existing vehicle
Circuit is anti-interference to vehicle electromagnetic compatibility to produce noise, can influence the sensitivity of automobile controller and asking for antijamming capability
Topic, can improve the security and antijamming capability of finished vehicle electronic system.
The present invention also provides a kind of vehicle EMC earth fault Check Systems, including：Frequency spectrum detection unit, for operation
Vehicle carry out spectrum scan, and export scanning obtain spectrum value.Risk parts detection unit, for according to the frequency spectrum
The spectrum value of detection unit output, determines that spectrum peak is more than the risk parts of given threshold.Electromagnet radiation detection unit, is used
It is whether qualified in the electromagnetic radiation for detecting the risk parts.Earth Fault Detection unit, in the risk parts
Electromagnetic radiation it is qualified in the case of, detect earthed circuit working frequency and ground connection line length；And connect in the single-point of detection
The working frequency of ground circuit is less than first frequency threshold value, and the ground connection line length of the single-point grounding circuit is when being more than λ/4, it is determined that
Line length failure is grounded, wherein, λ is electromagnetic radiation antenna wavelength.
The system also includes：The working frequency of the single-point grounding circuit detected in the Earth Fault Detection unit is more than institute
State first frequency threshold value and less than second frequency threshold value, and the ground connection line length is when being more than λ/20, the Earth Fault Detection
Unit determines ground connection line length failure.
Further, the Earth Fault Detection unit is additionally operable to detect the common ground impedance of earthed circuit, and described common
When ground impedance is more than setting impedance threshold, then the Earth Fault Detection unit determines that earthed circuit produces impedance coupler altogether and done
Disturb, be earthing mode failure.If earthing mode is series connection single-point ground structure, need to be changed to single-point grounding structure in parallel.
Further, the Earth Fault Detection unit is additionally operable to detect the voltage of the common ground impedance of earthed circuit.And
The working frequency for detecting multipoint earthing circuit in the Earth Fault Detection unit is more than second frequency threshold value, and the multiple spot
When the ground connection line length of earthed circuit is more than λ/20, the Earth Fault Detection unit determines ground connection line length failure.Described
When the voltage of impedance is more than voltage threshold altogether, the Earth Fault Detection unit determines that earthed circuit has ground loop electricity
Stream, is ground wire connecting fault, needs overstriking ground wire or using bus-bar connection.It can be seen that, the present invention provides a kind of vehicle EMC and connect
Earth fault Check System, is detected by working frequency and earthing mode to earthed circuit, using in different work frequencies
Rate uses different earthing modes, and noise can be produced so that the earthed circuit for solving existing vehicle is anti-interference to vehicle electromagnetic compatibility,
The problem of sensitivity and the antijamming capability of automobile controller can be influenceed, can improve the security of finished vehicle electronic system and anti-interference
Ability.
Construction, feature and the action effect of the present invention, above institute is described in detail according to diagrammatically shown embodiment above
Only presently preferred embodiments of the present invention is stated, but the present invention is not to limit practical range shown in drawing, it is every according to structure of the invention
Want made change, or be revised as the equivalent embodiment of equivalent variations, still without departing from specification with illustrating during covered spirit,
All should be within the scope of the present invention.
Claims (10)
1. a kind of vehicle EMC earth faults investigate method, it is characterised in that including：
Spectrum scan is carried out to the vehicle of operation using investigation method, localized spectroscopy peak value is more than the risk parts of given threshold；
Detect whether the electromagnetic radiation of the risk parts is qualified, if it is, into earthed circuit malfunction elimination；
Detect the working frequency and ground connection line length of earthed circuit；
If the working frequency of single-point grounding circuit is less than first frequency threshold value, and the ground connection line length is more than λ/4, then to connect
Ground line length failure, wherein, λ is electromagnetic radiation antenna wavelength.
2. vehicle EMC earth faults investigate method according to claim 1, it is characterised in that also include：
When the working frequency of single-point grounding circuit is more than the first frequency threshold value and is less than second frequency threshold value, if ground connection
Line length is more than λ/20, then is ground connection line length failure.
3. vehicle EMC earth faults investigate method according to claim 2, it is characterised in that also include：
The common ground impedance of single-point grounding circuit is detected, if the impedance altogether is more than setting impedance threshold, it is determined that ground connection electricity
Road produces impedance coupled interference altogether, is earthing mode failure.
4. vehicle EMC earth faults investigate method according to claim 3, it is characterised in that also include：
The working frequency of multipoint earthing circuit is detected, is more than second frequency threshold value in the working frequency of the multipoint earthing circuit
When, if ground connection line length is more than λ/20, for ground connection line length failure.
5. vehicle EMC earth faults investigate method according to claim 4, it is characterised in that also include：
The voltage of the common ground impedance of multipoint earthing circuit is detected, judges to whether there is ground voltage between the impedance altogether, if
In the presence of being then ground wire connecting fault.
6. vehicle EMC earth faults investigate method according to claim 5, it is characterised in that the first frequency threshold value
1MHz, the second frequency threshold value is 10MHz.
7. a kind of vehicle EMC earth fault Check Systems, it is characterised in that including：
Frequency spectrum detection unit, carries out spectrum scan, and export the spectrum value that scanning is obtained for the vehicle to operation；
Risk parts detection unit, for the spectrum value exported according to the frequency spectrum detection unit, determines that spectrum peak is more than
The risk parts of given threshold；
Electromagnet radiation detection unit, for detecting whether the electromagnetic radiation of the risk parts is qualified；
Earth Fault Detection unit, in the case where the electromagnetic radiation of the risk parts is qualified, detecting earthed circuit
Working frequency and ground connection line length；And the working frequency of the single-point grounding circuit in detection is less than first frequency threshold value, and
When the ground connection line length of the single-point grounding circuit is more than λ/4, it is determined that ground connection line length failure, wherein, λ is electromagnetic radiation antenna
Wavelength.
8. vehicle EMC earth fault Check Systems according to claim 7, it is characterised in that also include：
The Earth Fault Detection unit detect single-point grounding circuit working frequency be more than the first frequency threshold value and
Less than second frequency threshold value, and the ground connection line length, when being more than λ/20, the Earth Fault Detection unit determines ground connection line length
Spend failure.
9. vehicle EMC earth fault Check Systems according to claim 8, it is characterised in that
The Earth Fault Detection unit is additionally operable to detect the common ground impedance of earthed circuit；And detecting the impedance altogether
During more than setting impedance threshold, determine that earthed circuit produces impedance coupled interference altogether, be earthing mode failure.
10. vehicle EMC earth fault Check Systems according to claim 9, it is characterised in that
The Earth Fault Detection unit is additionally operable to detect the voltage of the common ground impedance of earthed circuit；And connect detecting multiple spot
The working frequency of ground circuit is more than second frequency threshold value, and the ground connection line length of the multipoint earthing circuit is when being more than λ/20, really
Surely it is grounded line length failure；
When the voltage for detecting the impedance altogether is more than voltage threshold, determines that earthed circuit has ground loop currents, be
Ground wire connecting fault.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710686741.3A CN107247210A (en) | 2017-08-11 | 2017-08-11 | A kind of vehicle EMC earth faults investigate method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710686741.3A CN107247210A (en) | 2017-08-11 | 2017-08-11 | A kind of vehicle EMC earth faults investigate method and system |
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| CN107247210A true CN107247210A (en) | 2017-10-13 |
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ID=60012289
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