CN109738722A - A kind of localization method carrying out electromagnetic interference source in vehicle based on CAN bus data - Google Patents
A kind of localization method carrying out electromagnetic interference source in vehicle based on CAN bus data Download PDFInfo
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Abstract
The present invention provides a kind of localization methods that electromagnetic interference source in vehicle is carried out based on CAN bus data, belong to vehicle and technical field of electromagnetic compatibility.A kind of its technical solution are as follows: localization method that electromagnetic interference source in vehicle is carried out based on CAN bus data, comprising the following steps: S1: data collection and analysis is carried out by CAN bus data acquisition equipment；S2: node Electro Magnetic Compatibility analysis；The analysis of node Electro Magnetic Compatibility；S3: oscilloscope measurement data analysis；S4: there is the functionally or logically carry out CAN accident analysis of erroneous frame node in foundation；S5: interference source and interference path analysis.The invention has the benefit that the present invention, which can be improved positioning vehicle interior, generates the interference source of interference and the efficiency of interference path to CAN bus, the time of the positioning of electromagnetic vehicle compatibling problem and analysis is shortened, and ensure that the accuracy of interference source positioning.
Description
Technical field
The present invention relates to technical field more particularly to a kind of electromagnetic interference source in vehicle is carried out based on CAN bus data
Localization method.
Background technique
While promotion in terms of power performance, economy, comfort, safety, reduction,
More and more electronic components are applied to vehicle, and the electromagnetic compatible environment of vehicle interior is caused to become increasingly complex, especially mixed
Inside conjunction power, fuel cell and pure electric vehicle other than with 12/24V Low-voltage Electronic component, it is also mounted up to several hundred
The high-voltage electric parts of volt, cause electromagnetic vehicle environment more severe, and high-voltage electric parts generate Low-voltage Electronic component tight
The case where weight electromagnetic interference leads to Low-voltage Electronic component cisco unity malfunction happens occasionally.
When vehicle encounters electromagnetic compatibility problem, it will usually by the component sample presentation to go wrong to road vehicle component electricity
The compatible laboratory of magnetic is tested, and then carries out analysis of EMC Problems and three elements positioning by the data of test, in this way
Not only extend the R&D cycle of vehicle, and since the price of electromagnetic compatibility laboratory test valuableness causes to research and develop cost increasing
Add.
Summary of the invention
The purpose of the present invention is to provide a kind of using conventional CAN bus DATA REASONING equipment, oscillograph, spectrum analysis
Instrument carries out vehicle on-line measurement analysis, effectively reduces job costs and shortens the CAN bus data progress of duty cycle
The localization method of electromagnetic interference source in vehicle.
The present invention is realized by following measure: a kind of to carry out electromagnetic interference source in vehicle based on CAN bus data
Localization method, comprising the following steps:
Step 1: the positioning of electromagnetic interference source in vehicle is carried out using CAN bus data, passes through CAN data acquisition equipment
Data acquisition is carried out, excessively causes to allow it automatic under the conditions of node loss and node presence satisfaction if not erroneous frame
Data are stopped paying out, then judge whether the condition has been set up, set up the functionally or logically carry out CAN failure for then passing through vehicle and the node
Otherwise analysis needs to carry out EMC analysis；If node is not allowed to stop paying out data and the node loss, electromagnetic compatibility is carried out
Analysis；Lead to node loss if there is erroneous frame or excessive erroneous frame, is then carried out by the oscilloscope measurement data of CAN bus
It analyses whether to be caused by electromagnetic interference, is, carry out interference source and interference path analysis, otherwise pass through the function of vehicle and the node
Energy or logic carry out CAN accident analysis；
Step 2: CAN data acquisition equipment is accessed into vehicle CAN network, and simultaneously by each waking up nodes in the CAN network
Check data, exclude baud rate is inconsistent, CAN physics harness bad connection, lack build-out resistor etc. due to caused by CAN
Communication failure；
Step 3: in normal vehicle operation, there is that CAN node is excessive in non-erroneous frame, and the node is working
Do not allow to lose suddenly in the case where stopping paying out data under normal condition, needs to can be carried out the node Electro Magnetic Compatibility analysis, and
Rectification scheme is formulated based on the analysis results, node loss occurs when changing if it is node working condition, then selective analysis node
The Electro Magnetic Compatibility of itself is connect including control panel with the physical layout position in internal interference source and ground, the I/O of MCU mouth is
It is no be interfered, whether have the noisy cable of tool MCU nearby situations such as analyzed, and by spectrum analyzer and nearby
Probe verifying analysis result；Otherwise the electromagnetic compatibility feature of the selective analysis node local environment, before the node loss time
The variation of rear vehicle working condition determines interference source components that may be present, to the electric characteristic of potential interference source block,
With lose the connection type of node, analyzed with the physical distance for losing node and its harness, and by spectrum analyzer with
Near field probes gradually confirm to determine main interference source analysis result, are gone out by frequency spectrograph data and data variation law-analysing
The feature and interference path of interference signal；
Step 4: in normal vehicle operation, the wrong frame of CAN bus even erroneous frame excessively leads to one or more
When a node loss, need to analyze CAN network signal quality；Sending erroneous frame if it is some node excessively leads to it
His node loss, then analyze the functionally or logically failure of the sending node；Otherwise network determination receives electromagnetic interference；It will
CAN_H (high level transmission line), CAN (CAN bus refer to grounding point) and CAN_L (low level transmission line), lead to respectively to CAN
It crosses differential probe and is connected to oscillograph, measure VCAN_H(CAN_H is to CAN ground voltage) and VCAN_L(CAN_L is to CAN ground voltage), and
Differential voltage V is obtained by channel subtraction calculations or another way the differential probe measurement of oscillographdiff=VCAN_H-VCAN_L, respectively
Define VdiffTime t in placeBSampled point time TB_sampling∈[tB× 75%, tB× 82%] voltage Vdiff_sampling、CAN
The recessive position minimum voltage that bus network requires is Vdiff_r_min, CAN bus network requirement recessive position maximum voltage be
Vdiff_r_max, CAN bus network requirement dominant bit minimum voltage be Vdiff_d_min, the dominant bit of CAN bus network requirement it is maximum
Voltage is Vdiff_d_maxIf bus is recessive state Vdiff_sampling∈(Vdiff_r_min,Vdiff_r_max) when simultaneously bus be aobvious
Character state Vdiff_sampling∈(Vdiff_d_min,Vdiff_d_max) when bus data it is normal, otherwise CAN bus network receives electromagnetism
Interference；
Step 5: analysis VCAN_HAnd VCAN_LData, respectively between the positioning voltage fluctuation consistent adjacent time of peak-to-peak value twice
Every Tinterference_n, then the source frequency is interfered to be respectivelyWherein interference_n is interference
Source 1...n, similarly analyzes VdiffLead to each interference source frequency that bus data is interfered, as leads to the interference of bus failure
Source frequency, remaining is potential interference source frequency；
Step 6: according to the switching circuit frequency and frequency spectrograph measuring signal of each interference source frequency, vehicle-mounted each components, lead to
It crosses and the exclusive methods mode such as stop working, cut off power supply is used to confirm each interference source, and according to each interference source and vehicle
The physical distance of the connection type of frame, its harness away from CAN bus etc. confirms interference path.
In order to preferably realize that foregoing invention purpose, the present invention provide a kind of based on electricity in CAN bus data progress vehicle
The localization method in magnetic disturbance source, comprising the following steps:
S1: data collection and analysis is carried out by CAN bus data acquisition equipment；
S2: the node Electro Magnetic Compatibility analysis of loss；
S3: oscilloscope measurement data analysis；
S4: there is the functionally or logically carry out CAN accident analysis of erroneous frame node in foundation；
S5: interference source and interference path analysis.
In the step S1, carrying out data collection and analysis by CAN bus data acquisition equipment, specific step is as follows:
(1) CAN bus data acquisition equipment acquires CAN network data, and excludes that each node baud rate is inconsistent, harness connects
Connect bad, the uncomfortable caused CAN bus failure of build-out resistor；
(2) non-erroneous frame excessively causes and node can be made to stop paying out data cases lower node loss without any condition, holds
Row step S2, non-erroneous frame, which excessively leads to and meets some or multiple conditions node can be made to stop paying out data cases lower node, to be lost
It loses, executes step S4；
(3) if there is erroneous frame or erroneous frame excessively lead to node loss, step S3 is executed.
In the step S2, specific step is as follows for the node Electro Magnetic Compatibility analysis of loss:
(1) if node changes in itself working condition, the voltage change ratio of high-tension circuit is greater than 1 millisecond every volt or electricity
When rheology rate is greater than 1 millisecond every ampere, high-tension circuit generates interference to low-voltage circuit, so that low-voltage circuit can not be transported normally
Row, leads to the node loss, then whether its master control borad circuit of selective analysis is interfered and causes；Otherwise, this step S2 is executed；
(2) node loss fore-aft vehicle working condition is analyzed；
(3) voltage change ratio of vehicle operating status variation front and back, high-tension circuit is greater than 1 millisecond every volt or curent change
Other components of rate greater than 1 millisecond every ampere are defined as the electronic component that there is interference to the node；
(4) all electronic components that there is interference are analyzed in the circuit interference frequency of node loss moment using oscillograph
Rate, the completely the same signal of continuous several times waveform measured by oscillograph, i.e. periodic jamming signals, reads adjacent periods signal
Between interval time, it is inverted to the interval time be its circuit interfering frequency；
(5) check whether the electronic component of be likely to become interference source passes through connector and be directly connected to the node,
Or the harness of its harness and the node directly bands together, for there are the components of above-mentioned phenomenon as selective analysis pair
As；
(6) these electronic components for becoming interference source are carried out by exclusive method using spectrum analyzer and near field probes
It checks and determines interference source；
(7) according to the result after investigation and in conjunction with spectrum analyzer data validation interference path.
In the step S3, the node Electro Magnetic Compatibility of loss analyzes specific steps are as follows:
(1) respectively measurement CAN_H to CAN, CAN_L to CAN ground voltage signal, to determine CAN_H and CAN_L signal wire
Whether it is interfered, if measurement result complies with standard ISO 11898-1-2003 road vehicle-controller local area network-data
Link layer and physical signal, then CAN bus is undisturbed, and step S3 terminates；Otherwise, step S3 is continued to execute；
(2) periodic jamming signals occurred on CAN_H and CAN_L are observed, adjacent periods are read by oscilloscope measurement
Property signal between interval time, and to the interval time it is inverted with determine its interfering frequency；
(3) the aperiodicity interference signal occurred on CAN_H and CAN_L is analyzed according to vehicle operating status, confirmation generates
The electronic component of interference；
(4) differential signal V is calculateddiff=VCAN_H-VCAN_L；If ring when aobvious/recessive level conversion causes position to sample
Point exceeds normal range (NR), then adjusts build-out resistor；
(5) it is analyzed by differential data, the interference source that will affect differential data signals quality is determined as to CAN network data
The interference source of interference is produced, others are potential interference source.
In the step S4, according to the specific steps for the functionally or logically progress CAN accident analysis of erroneous frame node occur
It is as follows:
(1) node is extracted from CAN network, node CAN physical level signal is analyzed in independent measurement；
(2) it acquires message data and analyzes whether extremely node CAN sends program.
In the step S5, determining interference source frequency according to periodic jamming signals, specific step is as follows:
(1) interference source frequency is determined according to periodic jamming signals；
(2) interference source of burst is determined according to vehicle operating status；
(3) it is analyzed according to step (1) and step (2) result with reference to the report of each electronic component electromagnetic compatibility test,
Determine possible interference source；
(4) interference distinguished potential interference source by measurement or the differential level calculated and CAN data have been had an impact
Source；
(5) according to the physical connection mode for the electronic component and harness and CAN bus harness for generating interference and physics away from
From in conjunction with analyzing and determine interference path by spectrum analyzer data.
The invention has the benefit that the invention proposes carry out electromagnetic interference source in vehicle based on CAN bus data
Localization method combines according to the data of CAN bus DATA REASONING equipment, oscillograph and spectrum analyzer and effectively three, right
Electromagnetic vehicle interference source and interference path are analyzed and are positioned, to effectively improve the analysis effect of electromagnetic vehicle compatibling problem
Rate, and ensure that the accuracy of interference source and interference path to greatest extent；It is total to CAN to effectively raise positioning vehicle interior
Line generates the interference source of interference and the efficiency of interference path, shortens the time of the positioning of electromagnetic vehicle compatibling problem and analysis, and
It ensure that the accuracy of interference source positioning, this method are equally applicable to the Electro Magnetic Compatibility rectification point that vehicle carries out bulletin test
Analysis.
Detailed description of the invention
Fig. 1 is that the present invention shows through electromagnetic interference source and interference path overall flow figure in CAN data analysis vehicle.
Fig. 2 is that oscilloscope data of the present invention measures connection schematic diagram.
Fig. 3 is oscilloscope data analysis flow chart diagram of the present invention.
Fig. 4 is the node Electro Magnetic Compatibility analysis flow chart diagram that the present invention loses.
Fig. 5 is interference source of the present invention and interference path analysis flow chart diagram.
Specific embodiment
In order to clearly illustrate the technical characterstic of this programme, below by specific embodiment, this programme is illustrated.
Referring to Fig. 1 to Fig. 5, the present invention is: a kind of positioning side carrying out electromagnetic interference source in vehicle based on CAN bus data
Method, comprising the following steps:
Step 1: the positioning of electromagnetic interference source in vehicle is carried out using CAN bus data, passes through CAN data acquisition equipment
Data acquisition is carried out, excessively causes to allow it automatic under the conditions of node loss and node presence satisfaction if not erroneous frame
Data are stopped paying out, then judge whether the condition has been set up, set up the functionally or logically carry out CAN failure for then passing through vehicle and the node
Otherwise analysis needs to carry out EMC analysis；If node is not allowed to stop paying out data and the node loss, electromagnetic compatibility is carried out
Analysis；Lead to node loss if there is erroneous frame or excessive erroneous frame, is then carried out by the oscilloscope measurement data of CAN bus
It analyses whether to be caused by electromagnetic interference, is, carry out interference source and interference path analysis, otherwise pass through the function of vehicle and the node
Energy or logic carry out CAN accident analysis；
Step 2: CAN data acquisition equipment is accessed into vehicle CAN network, and simultaneously by each waking up nodes in the CAN network
Check data, exclude baud rate is inconsistent, CAN physics harness bad connection, lack build-out resistor etc. due to caused by CAN
Communication failure；
Step 3: in normal vehicle operation, there is that CAN node is excessive in non-erroneous frame, and the node is working
Do not allow to lose suddenly in the case where stopping paying out data under normal condition, needs to can be carried out the node Electro Magnetic Compatibility analysis, and
Rectification scheme is formulated based on the analysis results, node loss occurs when changing if it is node working condition, then selective analysis node
The Electro Magnetic Compatibility of itself is connect including control panel with the physical layout position in internal interference source and ground, the I/O of MCU mouth is
It is no be interfered, whether have the noisy cable of tool MCU nearby situations such as analyzed, and by spectrum analyzer and nearby
Probe verifying analysis result；Otherwise the electromagnetic compatibility feature of the selective analysis node local environment, before the node loss time
The variation of rear vehicle working condition determines interference source components that may be present, to the electric characteristic of potential interference source block,
With lose the connection type of node, analyzed with the physical distance for losing node and its harness, and by spectrum analyzer with
Near field probes gradually confirm to determine main interference source analysis result, are gone out by frequency spectrograph data and data variation law-analysing
The feature and interference path of interference signal；
Step 4: in normal vehicle operation, the wrong frame of CAN bus even erroneous frame excessively leads to one or more
When a node loss, need to analyze CAN network signal quality；Sending erroneous frame if it is some node excessively leads to it
His node loss, then analyze the functionally or logically failure of the sending node；Otherwise network determination receives electromagnetic interference；It will
CAN_H (high level transmission line), CAN (CAN bus refer to grounding point) and CAN_L (low level transmission line), lead to respectively to CAN
It crosses differential probe and is connected to oscillograph, measure VCAN_H(CAN_H is to CAN ground voltage) and VCAN_L(CAN_L is to CAN ground voltage), and
Differential voltage V is obtained by channel subtraction calculations or another way the differential probe measurement of oscillographdiff=VCAN_H-VCAN_L, respectively
Define VdiffTime t in placeBSampled point time TB_sampling∈[tB× 75%, tB× 82%] voltage Vdiff_sampling、CAN
The recessive position minimum voltage that bus network requires is Vdiff_r_min, CAN bus network requirement recessive position maximum voltage be
Vdiff_r_max, CAN bus network requirement dominant bit minimum voltage be Vdiff_d_min, the dominant bit of CAN bus network requirement it is maximum
Voltage is Vdiff_d_maxIf bus is recessive state Vdiff_sampling∈(Vdiff_r_min,Vdiff_r_max) when simultaneously bus be aobvious
Character state Vdiff_sampling∈(Vdiff_d_min,Vdiff_d_max) when bus data it is normal, otherwise CAN bus network receives electromagnetism
Interference；
Step 5: analysis VCAN_HAnd VCAN_LData, respectively between the positioning voltage fluctuation consistent adjacent time of peak-to-peak value twice
Every Tinterference_n, then the source frequency is interfered to be respectivelyWherein interference_n is interference
Source 1...n, similarly analyzes VdiffLead to each interference source frequency that bus data is interfered, as leads to the interference of bus failure
Source frequency, remaining is potential interference source frequency；
Step 6: according to the switching circuit frequency and frequency spectrograph measuring signal of each interference source frequency, vehicle-mounted each components, lead to
It crosses and the exclusive methods mode such as stop working, cut off power supply is used to confirm each interference source, and according to each interference source and vehicle
The physical distance of the connection type of frame, its harness away from CAN bus etc. confirms interference path.
In order to preferably realize that foregoing invention purpose, the present invention provide a kind of based on electricity in CAN bus data progress vehicle
The localization method in magnetic disturbance source, comprising the following steps:
S1: data collection and analysis is carried out by CAN bus data acquisition equipment；
S2: the node Electro Magnetic Compatibility analysis of loss；
S3: oscilloscope measurement data analysis；
S4: there is the functionally or logically carry out CAN accident analysis of erroneous frame node in foundation；
S5: interference source and interference path analysis.
In step S1, carrying out data collection and analysis by CAN bus data acquisition equipment, specific step is as follows:
(1) CAN bus data acquisition equipment acquires CAN network data, and excludes that each node baud rate is inconsistent, harness connects
Connect bad, the uncomfortable caused CAN bus failure of build-out resistor；
(2) non-erroneous frame excessively causes and node can be made to stop paying out data cases lower node loss without any condition, holds
Row step S2, non-erroneous frame, which excessively leads to and meets some or multiple conditions node can be made to stop paying out data cases lower node, to be lost
It loses, executes step S4；
(3) if there is erroneous frame or erroneous frame excessively lead to node loss, step S3 is executed.
In step S2, specific step is as follows for the node Electro Magnetic Compatibility analysis of loss:
(1) if node changes in itself working condition, the voltage change ratio of high-tension circuit is greater than 1 millisecond every volt or electricity
When rheology rate is greater than 1 millisecond every ampere, high-tension circuit generates interference to low-voltage circuit, so that low-voltage circuit can not be transported normally
Row, leads to the node loss, then whether its master control borad circuit of selective analysis is interfered and causes；Otherwise, this step S2 is executed；
(2) node loss fore-aft vehicle working condition is analyzed；
(3) voltage change ratio of vehicle operating status variation front and back, high-tension circuit is greater than 1 millisecond every volt or curent change
Other components of rate greater than 1 millisecond every ampere are defined as the electronic component that there is interference to the node；
(4) all electronic components that there is interference are analyzed in the circuit interference frequency of node loss moment using oscillograph
Rate, the completely the same signal of continuous several times waveform measured by oscillograph, i.e. periodic jamming signals, reads adjacent periods signal
Between interval time, it is inverted to the interval time be its circuit interfering frequency；
(5) check whether the electronic component of be likely to become interference source passes through connector and be directly connected to the node,
Or the harness of its harness and the node directly bands together, for there are the components of above-mentioned phenomenon as selective analysis pair
As；
(6) these electronic components for becoming interference source are carried out by exclusive method using spectrum analyzer and near field probes
It checks and determines interference source；
(7) according to the result after investigation and in conjunction with spectrum analyzer data validation interference path.
In step S3, the node Electro Magnetic Compatibility of loss analyzes specific steps are as follows:
(1) respectively measurement CAN_H to CAN, CAN_L to CAN ground voltage signal, to determine CAN_H and CAN_L signal wire
Whether it is interfered, if measurement result complies with standard ISO 11898-1-2003 road vehicle-controller local area network-data
Link layer and physical signal, then CAN bus is undisturbed, and step S3 terminates；Otherwise, step S3 is continued to execute；
(2) periodic jamming signals occurred on CAN_H and CAN_L are observed, adjacent periods are read by oscilloscope measurement
Property signal between interval time, and to the interval time it is inverted with determine its interfering frequency；
(3) the aperiodicity interference signal occurred on CAN_H and CAN_L is analyzed according to vehicle operating status, confirmation generates
The electronic component of interference；
(4) differential signal V is calculateddiff=VCAN_H-VCAN_L；If ring when aobvious/recessive level conversion causes position to sample
Point exceeds normal range (NR), then adjusts build-out resistor；
(5) it is analyzed by differential data, the interference source that will affect differential data signals quality is determined as to CAN network data
The interference source of interference is produced, others are potential interference source.
In step S4, according to the CAN accident analysis that functionally or logically carries out for erroneous frame node occur, specific step is as follows:
(1) node is extracted from CAN network, node CAN physical level signal is analyzed in independent measurement；
(2) it acquires message data and analyzes whether extremely node CAN sends program.
In step S5, determining interference source frequency according to periodic jamming signals, specific step is as follows:
(1) interference source frequency is determined according to periodic jamming signals；
(2) interference source of burst is determined according to vehicle operating status；
(3) it is analyzed according to step (1) and step (2) result with reference to the report of each electronic component electromagnetic compatibility test,
Determine possible interference source；
(4) interference distinguished potential interference source by measurement or the differential level calculated and CAN data have been had an impact
Source；
(5) according to the physical connection mode for the electronic component and harness and CAN bus harness for generating interference and physics away from
From in conjunction with analyzing and determine interference path by spectrum analyzer data.
Technical characteristic of the present invention without description can realize that details are not described herein by or using the prior art, certainly,
The above description is not a limitation of the present invention, and the present invention is also not limited to the example above, the ordinary skill of the art
The variations, modifications, additions or substitutions that personnel are made within the essential scope of the present invention also should belong to protection model of the invention
It encloses.
Claims (6)
1. a kind of localization method for carrying out electromagnetic interference source in vehicle based on CAN bus data, which is characterized in that including following step
It is rapid:
S1: data collection and analysis is carried out by CAN bus data acquisition equipment；
S2: the node Electro Magnetic Compatibility analysis of loss；
S3: oscilloscope measurement data analysis；
S4: there is the functionally or logically carry out CAN accident analysis of erroneous frame node in foundation；
S5: interference source and interference path analysis.
2. the localization method according to claim 1 for carrying out electromagnetic interference source in vehicle based on CAN bus data, feature
It is, in the step S1, carrying out data collection and analysis by CAN bus data acquisition equipment, specific step is as follows:
(1) CAN bus data acquisition equipment acquires CAN network data, and exclude each node baud rate is inconsistent, harness connection not
Good, the uncomfortable caused CAN bus failure of build-out resistor；
(2) non-erroneous frame excessively causes and node can be made to stop paying out data cases lower node loss without any condition, executes step
Rapid S2, non-erroneous frame, which excessively leads to and meet some or multiple conditions, can make node stop paying out data cases lower node loss,
Execute step S4；
(3) if there is erroneous frame or erroneous frame excessively lead to node loss, step S3 is executed.
3. the localization method according to claim 1 or 2 that electromagnetic interference source in vehicle is carried out based on CAN bus data,
It is characterized in that, in the step S2, specific step is as follows for the node Electro Magnetic Compatibility analysis of loss:
(1) if node changes in itself working condition, the voltage change ratio of high-tension circuit is greater than 1 millisecond every volt or electric current becomes
When rate is greater than 1 millisecond every ampere, high-tension circuit generates interference to low-voltage circuit, so that low-voltage circuit can not operate normally,
Lead to the node loss, then whether its master control borad circuit of selective analysis is interfered and causes；Otherwise, this step S2 is executed；
(2) node loss fore-aft vehicle working condition is analyzed；
(3) voltage change ratio of vehicle operating status variation front and back, high-tension circuit is greater than 1 millisecond every volt or current changing rate is big
The electronic component that there is interference to the node is defined as in 1 millisecond every ampere other components；
(4) all electronic components that there is interference are analyzed in the circuit interfering frequency of node loss moment using oscillograph, shown
The completely the same signal of continuous several times waveform, i.e. periodic jamming signals measured by wave device are read between adjacent periods signal
Interval time, it is inverted to the interval time be its circuit interfering frequency；
(5) check the electronic component of be likely to become interference source whether pass through connector be directly connected to the node or its
The harness of harness and the node directly bands together, for there are the components of above-mentioned phenomenon as selective analysis object；
(6) these electronic components for becoming interference source are checked by exclusive method using spectrum analyzer and near field probes
And determine interference source；
(7) according to the result after investigation and in conjunction with spectrum analyzer data validation interference path.
4. the positioning side according to claim 1-3 for carrying out electromagnetic interference source in vehicle based on CAN bus data
Method, which is characterized in that in the step S3, the node Electro Magnetic Compatibility of loss analyzes specific steps are as follows:
(1) respectively measurement CAN_H to CAN, CAN_L to CAN ground voltage signal, whether to determine CAN_H and CAN_L signal wire
It is interfered, if measurement result complies with standard ISO 11898-1-2003 road vehicle-controller local area network-data link
Layer and physical signal, then CAN bus is undisturbed, and step S3 terminates；Otherwise, step S3 is continued to execute；
(2) periodic jamming signals occurred on CAN_H and CAN_L are observed, adjacent periods letter is read by oscilloscope measurement
Interval time between number, and it is inverted to determine its interfering frequency to the interval time；
(3) the aperiodicity interference signal occurred on CAN_H and CAN_L is analyzed according to vehicle operating status, confirmation generates interference
Electronic component；
(4) differential signal V is calculateddiff=VCAN_H-VCAN_L；If ring when aobvious/recessive level conversion leads to a sampled point
Beyond normal range (NR), then build-out resistor is adjusted；
(5) it is analyzed by differential data, the interference source that will affect differential data signals quality is determined as generating CAN network data
The interference source of interference, others are potential interference source.
5. the positioning side according to claim 1-4 for carrying out electromagnetic interference source in vehicle based on CAN bus data
Method, which is characterized in that in the step S4, according to the tool for the functionally or logically progress CAN accident analysis of erroneous frame node occur
Steps are as follows for body:
(1) node is extracted from CAN network, node CAN physical level signal is analyzed in independent measurement；
(2) it acquires message data and analyzes whether extremely node CAN sends program.
6. the positioning side according to claim 1-5 for carrying out electromagnetic interference source in vehicle based on CAN bus data
Method, which is characterized in that in the step S5, determining interference source frequency according to periodic jamming signals, specific step is as follows:
(1) interference source frequency is determined according to periodic jamming signals；
(2) interference source of burst is determined according to vehicle operating status；
(3) it is analyzed, is determined with reference to the report of each electronic component electromagnetic compatibility test according to step (1) and step (2) result
Possible interference source；
(4) interference source distinguished potential interference source by measurement or the differential level calculated and CAN data have been had an impact；
(5) according to the physical connection mode and physical distance of the electronic component and harness and CAN bus harness for generating interference, knot
Interference path is analyzed and is determined in conjunction by spectrum analyzer data.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665821A (en) * | 2020-06-08 | 2020-09-15 | 重庆长安汽车股份有限公司 | Error frame checking method based on vehicle diagnosis service |
| CN111948469A (en) * | 2019-05-17 | 2020-11-17 | 中国科学院声学研究所 | CAN bus electromagnetic compatibility detection method and system |
| CN112003774A (en) * | 2020-07-22 | 2020-11-27 | 东风汽车集团有限公司 | Method, system and storage medium for checking error frame of automobile CAN bus |
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