CN107450510B - A kind of signal resolution method quickly positioning CAN signal using diagnostic signal - Google Patents
A kind of signal resolution method quickly positioning CAN signal using diagnostic signal Download PDFInfo
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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Abstract
The invention proposes a kind of signal resolution methods that CAN signal is quickly positioned using diagnostic signal, comprising the following steps: diagnostic equipment connection is diagnosed interface to mark vehicle, carries out diagnosis request, record diagnosis signal to mark vehicle；Reading communication CAN data are connect with communication CAN line using CAN signal acquisition hardware, data on communication CAN are shown using CAN signal acquisition software, record CAN data；By the diagnostic signal of record and CAN data conversion format；The effective cog region for determining all CAN signals in diagnostic signal and CAN data, calculates effective cog region similarity；Effective cog region similarity and CAN signal are exported in the matrix form, the CAN signal in the matrix is verified by the sequence of effective cog region similarity from high to low, completes the positioning to CAN signal.This method is easy to operate, and arithmetic speed is high, applied widely.
Description
Technical field
The present invention relates to electric vehicle performance testing fields, and in particular to a kind of quickly to position CAN signal using diagnostic signal
Signal resolution method.
Background technique
With flourishing for New-energy electric vehicle industry, to international advanced new energy vehicle carry out accurately test and
Evaluation becomes one of the main task of current automotive industry.Accurately and reliably signal acquisition can be each new energy of high quality test evaluation
Source vehicle provides basic guarantee.Compared with other approach obtain signal, communication CAN signal have high reliability, high-frequency, in real time
Property preferably etc. series of advantages.And with the continuous release of each advanced new energy vehicle, also the timeliness of test evaluation is proposed
Higher requirement.It is thus as much as possible to obtain key signal from communication CAN, shorten the signal resolution period, to new energy
The test evaluation work of vehicle has great importance.
Currently, general CAN signal parsing needs to observe the changing rule of message data on the interface Trace, finds out and meet
Its coefficient and offset after signal is required signal in verify data area, then are demarcated in the data field of signal intensity rule to be resolved.On
Method is stated to the technical more demanding of operator, operator there should be preferable data sensitive.Different operators
It is also different to crack duration needed for signal.With the complication of new energy car portion CAN, the CAN data capacity in bus is larger, makes
At cumbersomeization of data field searching work.And due to Trace interface display be hexadecimal or decimal data, and it is practical
Message signals are by binary array, therefore the variation characteristic of individual signal is likely difficult to observe.It is difficult to the key signal parsed not
It obtains and is not obtained by diagnosis request method relatively easy to accomplish.And not only frequency is lower for the signal that diagnosis please be found out, hair
Diagnosis message out or normal communication progress a degree of interference to bus even influence vehicle and normally transport under individual cases
Row.Therefore, CAN signal must be quick and precisely parsed, avoiding diagnosis request as far as possible is the urgent need of current demand signal parsing work.
Summary of the invention
In order to overcome above-mentioned defect existing in the prior art, it is fast using diagnostic signal that the object of the present invention is to provide a kind of
The signal resolution method of speed positioning CAN signal, this method is easy to operate, and arithmetic speed is high, applied widely.
In order to realize above-mentioned purpose of the invention, CAN signal is quickly positioned using diagnostic signal the present invention provides a kind of
Signal resolution method, comprising the following steps:
Diagnostic equipment connection is diagnosed interface to mark vehicle, carries out diagnosis request, record diagnosis signal to mark vehicle by S1；
S2 is connect reading communication CAN data with communication CAN line using CAN signal acquisition hardware, is acquired using CAN signal
Data on software display communication CAN, record CAN data；
S3, by the diagnostic signal of record and CAN data conversion format；
S4 determines effective cog region of all CAN signals in diagnostic signal and CAN data, it is similar to calculate effective cog region
Degree；
S5 exports effective cog region similarity and CAN signal in the matrix form, which includes the institute in prescribed limit
There are affiliated message ID, signal length, signal start bit, the signal proportion coefficient, signal offset, data format, number of CAN signal
According to type and diagnostic signal similarity；
S6 verifies the CAN signal in the matrix by the sequence of effective cog region similarity from high to low, completes
Positioning to CAN signal.
The test of new energy vehicle and key signal type needed for evaluating are more, and feature of the same signal on different vehicles is not yet
Together.Will necessarily be very complicated if carrying out lookup according to the feature of signal itself, and versatility is not strong.And this method can be positioned quickly
The affiliated message of CAN signal similar with diagnostic signal, start bit, signal length, coefficient offset, type of data format information out,
It is as much as possible to obtain key signal from communication CAN so as to shorten the signal resolution period, it avoids reducing using diagnostic signal
Communication interference to vehicle.
Further, the CAN signal positioned, which exists, stablizes state of value, which can exist repeatedly.Stationary value
Upper and lower limits will be much smaller than signal value upper and lower limits.
Further, the diagnostic signal and CAN data include the CAN signal positioned varied to from stationary value it is unstable
Value, then the variation overall process of stationary value is varied to, the two record is the same variation overall process of CAN signal, this can be more comprehensively
Positioning CAN signal.
Further, the diagnostic signal is recorded by diagnostic equipment in the case where diagnostic equipment can recorde signal conditioning and is obtained,
Diagnostic equipment is unable under the conditions of tracer signal, is requested by diagnosis, is obtained in the CAN data of record by the conversion of dbc file.It should
The acquisition methods of CAN data in the case of method includes diagnostic equipment energy tracer signal and is unable to two kinds of tracer signal, this is more comprehensively
Searched CAN signal so as to the positioning of CAN signal more quickly, it is accurate.
Further, effective cog region is a 2 dimensional region, and the 2 dimensional region is opened by signal value from stationary value
Begin to change to originate, reverting to stationary value is the time zone between terminating, the value region between signal value and stationary value
It is formed, this extracts the effective cog region of all CAN signals, avoids the problem of lookup is omitted.
Further, effective cog region similarity includes time zone similarity and numerical value area similarity, time zone phase
Pass through the ratio of calculating diagnostic signal and CAN signal effective cog region time zone span difference and diagnostic signal time span like degree
Then value subtracts gained ratio with 100% and determines；Numerical value area similarity is by drawing diagnostic signal and CAN signal time zone
Divide identical number, then calculates the ratio between diagnostic signal and the average value of CAN signal in every a period, then calculate all
The standard deviation of ratio finally subtracts resulting value with 100% and determines divided by average of relatives value.
The object for calculating effective cog region similarity is all CAN signals in the CAN data of record, CAN signal and diagnosis
The effective cog region similarity of signal is higher, is higher a possibility that positioned CAN signal.Effective cog region similarity calculation
Method is simple, and accuracy is high, helps quickly to position CAN signal.
Further, step S5 including the following steps:
S5-1, a similarity circle point is formulated, all CAN signals that similarity is higher than this boundary's point is all screened；
Data format, the data type for the CAN signal that S5-2, judgement screen, calculating sifting come out the ratio of CAN signal
Example coefficient and offset；
S5-3, output matrix of consequence, it is specific to include message ID, signal length position belonging to all CAN signals for filtering out
Number, signal start bit, signal proportion coefficient, signal offset, data format, data type and diagnostic signal similarity.
The beneficial effects of the present invention are:
1. this method quickly positions doubtful CAN signal data field by diagnostic signal, output matrix is parsed containing CAN signal
All information needed for demarcating, accelerate the time of observation positioning signal region and signal scaling, to greatly shorten signal resolution week
Phase is beneficial to the timeliness of new energy vehicle test evaluation work.
2. the general frequency of diagnostic signal is low compared to communication CAN signal, and the acquisition process of diagnostic signal need to constantly send and examine
Disconnected request message, or a degree of interference is carried out to the normal communication of bus, vehicle is even influenced under individual cases normally to be transported
Row.And this method seeking scope is all signals on communication CAN, is conducive to communicate when parsing work and being difficult to promote
CAN signal replaces diagnosis request signal, improves signal frequency, reduces the interference to bus communication.This method seeking scope is comprehensive,
Registration, be conducive to communication CAN signal replaces diagnosis request signal, to optimization characteristics of signals, reduce communication interfere have compared with
For positive effect.
3. there are communicate on CAN not having when diagnostic signal since diagnostic signal and communication signal are not to correspond
The transmission of corresponding signal.The restrictive condition of program be arranged it is more relaxed still without output as a result, and all output result
It is proved after verifying in the case where not being required signal, it, can be first due to all CAN signals in this method thorough search CAN data
Step determines that having made encryption without the sending of this signal or signal on communication CAN causes to search failure.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is CAN signal and diagnostic signal feature schematic diagram；
Fig. 2 is the flow chart of this method；
Fig. 3 is to parse engine rotational speed signal schematic illustration using diagnostic signal.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can
, can also indirectly connected through an intermediary, for the ordinary skill in the art to be to be connected directly, it can basis
Concrete condition understands the concrete meaning of above-mentioned term.
The present invention provides a kind of signal resolution methods that CAN signal is quickly positioned using diagnostic signal, in conjunction with CAN signal
With the shape feature of corresponding diagnostic signal curve, as shown in Figure 1, i.e. diagnostic equipment signal and the CAN signal that coefficient offset is not added is bent
Line is not exclusively overlapped, and comprehensively considers the operability of physical record data, is screened the feasibility of signal algorithm, is utilized data processing
Software, programming handle diagnostic signal and all CAN signals, and positioning obtains effective cog region of the two, and calculating the two has
Imitate the similarity of cog region, the affiliated message ID of the higher all CAN signals of output similarity, signal length, signal start bit, letter
Number proportionality coefficient, signal offset, data format, data type, with diagnostic signal similarity.It is verified for next step and completes CAN
The parsing and calibration of signal.Specifically, as shown in Figure 2, comprising the following steps:
S1 diagnoses interface to mark vehicle using diagnostic equipment connection, carries out diagnosis request, record diagnosis signal to mark vehicle.It examines
Break signal is recorded by diagnostic equipment in the case where diagnostic equipment can recorde signal conditioning and is obtained, and is unable to tracer signal condition in diagnostic equipment
Under, it is requested by diagnosis, is obtained in the CAN data of record by the conversion of dbc file.Specially diagnostic equipment issues diagnosis request
There is diagnostic signal in bus afterwards, diagnostic signal is compiled into dbc, record CAN data, the dbc is loaded in CANOE software again
Sending out signals.
S2 is connect reading communication CAN data with communication CAN line using CAN signal acquisition hardware, is acquired using CAN signal
Data on software display communication CAN, record CAN data.
S3, by the diagnostic signal of record and CAN data conversion format.It is corresponding to be specially converted into data analyzing and processing software
Format after be read into the data analyzing and processing software progress step S4 and step S5.In numerous data analyzing and processing softwares
In, it can select but be not limited to be handled using MATLAB, diagnostic signal is divided into the signal of diagnostic equipment record and is included in CAN
The signal of two kinds of diagnostic signal in data, diagnostic equipment record does not have to format transformation mostly, for CAN data, in CANOE software
In save as ASC format, then replicate in the information stickup to EXCEL of needs or just completed in txt file format conversion.
S4 determines effective cog region of all CAN signals in diagnostic signal and CAN data, it is similar to calculate effective cog region
Degree.
Wherein, effective cog region is a 2 dimensional region, and the 2 dimensional region is changed since stationary value by signal value is
Starting, reverting to stationary value is the time zone between terminating, and the value region between signal value and stationary value is formed.
Effective cog region similarity includes time zone similarity and numerical value area similarity, and time zone similarity passes through meter
The ratio for calculating diagnostic signal and CAN signal effective cog region time zone span difference and diagnostic signal time span, is then used
100%, which subtracts gained ratio, determines；Numerical value area similarity is by dividing identical part for diagnostic signal and CAN signal time zone
Number then calculates the ratio between diagnostic signal and the average value of CAN signal in every a period, then calculates the standard of all ratios
Difference finally subtracts resulting value with 100% and determines divided by average of relatives value.
S5 exports effective cog region similarity and CAN signal in the matrix form, which includes within the specified scope
The affiliated message ID of all CAN signals, signal length, signal start bit, signal proportion coefficient, signal offset, data format,
Data type and diagnostic signal similarity.
The step specifically includes following steps:
S5-1, a similarity circle point is formulated, all CAN signals that similarity is higher than this boundary's point is all screened.
Data format, the data type for the CAN signal that S5-2, judgement screen, calculating sifting come out the ratio of CAN signal
Example coefficient and offset.
Screening technique are as follows: all possible data format, data type are searched into gained CAN signal, sieve is verified by real vehicle
Choosing, if multiple results have some CAN signal, the higher number for the CAN signal of similarity of time zone and numerical value area
According to format, data type.If only a kind of data format, data type program output the signal, can directly determine
Data format, data type for the CAN signal.A similarity circle point is formulated, time zone similarity is similar to numerical value area
Higher signal screening is spent come out, and similarity circle point is specifically formulated without unified standard, depending on specific actual conditions.
S5-3 exports matrix of consequence, specific to include message ID, signal length position belonging to all CAN signals for filtering out
Number, signal start bit, signal proportion coefficient, signal offset, data format, data type and diagnostic signal similarity.As a result
All CAN signal information of matrix are arranged according to the sequence of the CAN signal and the similarity of diagnostic signal from big to small.
S6 verifies the CAN signal in the matrix by the sequence of effective cog region similarity from high to low, completes
Positioning to CAN signal.
Verification method is that CANOE and diagnostic equipment are connected on real vehicle, and the position of CAN signal is incorporated into the load of dbc file, is become
The numerical value on the operating condition real time contrast real vehicle CAN signal value and diagnostic equipment is changed, whether unanimously to see, unanimously then indicates to CAN signal
Positioning it is correct, it is inconsistent, then it is incorrect.
The CAN signal positioned in this method has the state there are stationary value, which can exist repeatedly, in stationary value
Lower range will be much smaller than signal value upper and lower limits.Existing paraphrase card can be enumerated by down repeatedly: engine speed is being shut down
When be 0, be stationary value, shutting down this state can enter repeatedly.If certain signal is in certain situation, there are stationary values, but the feelings
Condition is very difficult to be reached, or even belongs to accidentalia, this signal cannot be repeatedly into stablizing state of value.
The diagnostic signal and CAN data include that the CAN signal positioned varies to unstable value from stationary value, then changes
To the variation overall process of stationary value, the two record is the same variation overall process of CAN signal.
Wherein, the CAN signal in search program and the similarity of diagnostic signal and the CAN signal are to be positioned CAN signal
A possibility that degree positive correlation.
Specifically, engine rotational speed signal is in engine off condition by taking certain new energy car engine tach signal as an example
There is stationary value 0, has the change value greater than 0 in starting state, meet requirement of this method to resolved signal characteristic.This example utilizes
Diagnostic equipment tracer signal.Operation vehicle makes engine from shutting down to starting again to shutdown, while manually recorded vehicle " is starting
The diagnostic equipment signal and CAN data of machine shutdown-engine start-engine shutdown " overall process guarantee the two record data as far as possible
It carries out simultaneously, the record of the two is allowed to have a little deviation around time.
Refering to Fig. 3, the diagnostic equipment signal of record and CAN data are converted into the manageable EXCEL format of MATLAB, and
After import MATLAB.Program is run in MATLAB to handle CAN signal all in diagnostic equipment signal, CAN data, it is fixed
Position signal value is changed since stationary value to originate, and it is the time zone between terminating that signal value, which revert to stationary value, with signal
The 2 dimensional region that value region between value and stationary value is formed, extracts effective cog region of the two.Then it is examined by calculating
The ratio of break signal and CAN signal effective cog region time zone span difference and diagnostic signal time span, then subtracted with 100%
Gained ratio determines time zone similarity；By the way that diagnostic signal and CAN signal time zone are divided into equal parts, calculate every
The ratio between diagnostic signal and the average value of CAN signal in a period, the standard deviation for then calculating all ratios are flat divided by ratio
Mean value finally subtracts resulting value with 100%, obtains numerical value area similarity.Formulate similarity circle point, in the present embodiment, time zone
Similarity circle point is 90%, and numerical value area similarity circle point is 80%, and all CAN signals that similarity is higher than this boundary's point are all sieved
It elects.Data format, the data type of the CAN signal screened are judged later, and calculating sifting comes out the ratio of CAN signal
Coefficient and offset.Result array is finally exported, message ID belonging to all CAN signals filtered out, signal length position are contained
Number, signal start bit, signal proportion coefficient, signal offset, data format, data type and diagnostic signal similarity, and press
According to the sequence arrangement of similarity degree from high to low.This example has multiple doubtful signals outputs, same by similarity from high to low suitable
Sequence is verified one by one.It is proved to be required signal after the highest signal authentication of this example similarity.Through repeatedly verifying completion repeatedly, in program
All information needed for having obtained engine rotational speed signal parsing calibration in obtained result array are searched, that is, complete certain new energy
The parsing and calibration of source car engine tach signal.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (5)
1. a kind of signal resolution method for quickly positioning CAN signal using diagnostic signal, it is characterised in that: the following steps are included:
Diagnostic equipment connection is diagnosed interface to mark vehicle, carries out diagnosis request to mark vehicle, record diagnosis signal by S1:
S2 connect reading communication CAN data with communication CAN line using CAN signal acquisition hardware, using CAN signal acquisition software
Data on display communication CAN, record CAN data；
S3, by the diagnostic signal of record and CAN data conversion format；
S4 determines effective cog region of all CAN signals in diagnostic signal and CAN data, calculates effective cog region similarity；
Effective cog region is a 2 dimensional region, and the 2 dimensional region is changed by signal value since stationary value to originate,
Reverting to stationary value is the time zone between terminating, and the value region between signal value and stationary value is formed；
Effective cog region similarity includes time zone similarity and numerical value area similarity, and time zone similarity is examined by calculating
The ratio of break signal and CAN signal effective cog region time zone span difference and diagnostic signal time span, is then subtracted with 100%
Go gained ratio to determine: numerical value area similarity is by dividing identical number for diagnostic signal and CAN signal time zone, then
Calculate the ratio between diagnostic signal and the average value of CAN signal in every a period, then calculate the standard deviations of all ratios divided by
Average of relatives value finally subtracts resulting value with 100% and determines；
S5 exports effective cog region similarity and CAN signal in the matrix form, which includes all in prescribed limit
The affiliated message work D of CAN signal, signal length, signal start bit, signal proportion coefficient, signal offset, data format, number
According to type and diagnostic signal similarity；
S6, the CAN signal in the matrix is verified by the sequence of effective cog region similarity from high to low, completion pair
The positioning of CAN signal.
2. the signal resolution method according to claim 1 for quickly being positioned CAN signal using diagnostic signal, feature are existed
In: the CAN signal positioned, which exists, stablizes state of value, which can exist repeatedly.
3. the signal resolution method according to claim 1 for quickly being positioned CAN signal using diagnostic signal, feature are existed
In: the diagnostic signal includes that the CAN signal positioned varies to unstable value from stationary value, then varies to steady with CAN data
The variation overall process of definite value, the two record is the same variation overall process of CAN signal.
4. the signal resolution method according to claim 1 for quickly being positioned CAN signal using diagnostic signal, feature are existed
In: the diagnostic signal is recorded by diagnostic equipment in the case where diagnostic equipment can recorde signal conditioning and is obtained, and cannot be recorded in diagnostic equipment
It under signal conditioning, is requested by diagnosis, is obtained in the CAN data of record by the conversion of dbc file.
5. the signal resolution method according to claim 1 for quickly being positioned CAN signal using diagnostic signal, feature are existed
In: step S5 including the following steps:
S5-1, a similarity circle point is formulated, all CAN signals that similarity is higher than this boundary's point is all screened；
Data format, the data type for the CAN signal that S5-2, judgement screen, calculating sifting come out the ratio system of CAN signal
Number and offset；
S5-3, output matrix of consequence, it is specific comprising message work D belonging to all CAN signals for filtering out, signal length digit,
Signal start bit, signal proportion coefficient, signal offset, data format, data type and diagnostic signal similarity.
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| CN108803572B (en) * | 2018-06-27 | 2021-04-06 | 深圳市元征科技股份有限公司 | Method, system and device for positioning automobile communication data |
| CN109581999B (en) * | 2018-11-05 | 2021-06-01 | 中国航空工业集团公司西安飞机设计研究所 | Method for processing state data of power distribution channel of aircraft electromechanical system |
| CN109660437B (en) * | 2018-12-26 | 2021-05-04 | 洛阳智能农业装备研究院有限公司 | Matlab-based CAN message analysis method |
| CN110162008B (en) * | 2019-05-10 | 2021-05-28 | 中国汽车技术研究中心有限公司 | CAN bus analysis method for new energy vehicle |
| CN111045416B (en) * | 2019-12-19 | 2020-10-30 | 中国汽车技术研究中心有限公司 | Method and device for analyzing CAN (controller area network) signal of whole vehicle by using diagnosis message |
| US11729016B2 (en) * | 2020-11-23 | 2023-08-15 | Institute For Information Industry | Vehicle data analysis device and vehicle data analysis method |
| CN113569106B (en) * | 2021-06-16 | 2023-10-13 | 东风汽车集团股份有限公司 | CAN data identification method, device and equipment |
| CN115826558B (en) * | 2022-11-23 | 2023-09-19 | 中汽院新能源科技有限公司 | Diagnostic signal analysis method based on VehicleSPY |
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