CN112468369B - Error detection method for CAN communication matrix of automobile - Google Patents
Error detection method for CAN communication matrix of automobile Download PDFInfo
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- CN112468369B CN112468369B CN202011374573.2A CN202011374573A CN112468369B CN 112468369 B CN112468369 B CN 112468369B CN 202011374573 A CN202011374573 A CN 202011374573A CN 112468369 B CN112468369 B CN 112468369B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses an error detection method of a CAN communication matrix of an automobile, which comprises the following steps: reading a header row of the CAN communication matrix, and identifying the columns of all item headers in the header row; executing an error detection strategy corresponding to the CAN communication matrix, detecting errors of all data items in the CAN communication matrix according to the project titles, and recording and prompting detected error information; the error detection strategy is formulated according to the encoding rule of the CAN signal in the CAN communication matrix, and comprises an error detection strategy for the numerical range of data items in the message and the signal, an error detection strategy for each row of arrangement format and an error detection strategy for a plurality of rows of data items with the same message ID. The method and the device realize automatic and rapid searching of errors in the CAN communication matrix and give prompt information, effectively improve the error detection efficiency of the CAN communication matrix and reduce the development cost of automobiles.
Description
Technical Field
The invention relates to the technical field of automobile communication, in particular to an error detection method of a CAN communication matrix of an automobile.
Background
At present, a CAN bus protocol becomes a standard bus of an automobile computer control system and an embedded industrial control local area network, the number of ECUs (vehicle-mounted control units) on each automobile CAN reach dozens, even hundreds of vehicles on luxury CAN be realized, more than 80% of the ECUs CAN be communicated by using a CAN bus, and the number of related signals CAN reach thousands.
The CAN Communication Matrix (CAN Communication Matrix) records basic information of messages and signals of each node of the CAN bus, including message names, message IDs, message sending types, sending periods, signal names, signal lengths, start bits, precision, offsets, and the like. Currently, automobile host plants almost use Microsoft Excel documents to record CAN communication matrices.
In the automobile development process, the earlier the error is found, the lower the cost is, but because the number of communication signals of each node is large and the number of main parameters of each signal is more than ten, the CAN has the defects of high probability of parameter writing errors and difficulty in error finding in the process of compiling and summarizing the communication matrix, so that a great deal of time is consumed for formulating and maintaining the CAN communication matrix in the automobile development period, wherein most of the time is used for checking the errors of the communication matrix, and the development cost is high.
Disclosure of Invention
The invention aims to provide an error detection method of a CAN communication matrix of an automobile, which CAN automatically and quickly execute an error detection strategy and find out errors in the CAN communication matrix.
In order to achieve the above object, the present invention provides an error detection method for a CAN communication matrix of an automobile, where the CAN communication matrix is a table recording basic information of messages and signals of each node, and includes:
reading a header row of the CAN communication matrix, and identifying the columns of all item headers in the header row;
executing an error detection strategy corresponding to the CAN communication matrix, detecting errors of all data items in the CAN communication matrix according to the project titles, and recording and prompting detected error information;
the error detection strategy is formulated according to the encoding rule of the CAN signal in the CAN communication matrix, and comprises an error detection strategy for the numerical range of data items in the message and the signal, an error detection strategy for each row of arrangement format and an error detection strategy for a plurality of rows of data items with the same message ID.
Optionally, the item titles in the title line include: message name, message ID, message length, message period, signal name, arrangement format, start bit, signal length and precision.
Optionally, the error detection strategy for the range of values of the data items in the message and the signal includes:
reading data items according to the title and rows in sequence, checking whether the numerical value of each data item in each row conforms to a preset numerical value range, if an error is detected, recording error information in sequence, prompting relevant error information after all rows are checked, and quitting executing the error detection strategy for the numerical value ranges of the data items in the message and the signal; and if no error exists, executing the error detection strategy for each row arrangement format.
Optionally, the checking whether the values in the data items in each row conform to a preset value range includes:
checking whether the data value of the length of each line of the message conforms to a preset length value range, if so, judging that the data value is correct, and otherwise, judging that the data value is wrong;
checking whether the data value of each row of the message period is a number not less than 0, if so, judging that the data value is correct, and if not, judging that the data value is wrong;
checking whether the data value of the initial bit of each row is a number not less than 0, if so, the data value is correct, and if not, the data value is wrong;
checking whether the data value of the signal length of each row is a number greater than 0, if so, the data value is correct, and if not, the data value is wrong;
and checking whether the data value of the precision of each row is a number which is not 0, if so, the data value is correct, and if not, the data value is wrong.
Optionally, the error detection strategy for each row permutation format includes:
checking whether the arrangement format of each row has an item which is inconsistent, if so, sequentially recording error information, prompting relevant error information after checking all rows, and quitting executing the error detection strategy for the arrangement format of each row; and if not, executing the error detection strategy for the multiple rows of data items with the same message ID.
Optionally, the message IDs in the CAN communication matrix are arranged in a table in a row-by-row sorting from small to large, and are sorted in a row-by-row sorting from small to large according to start bits under the condition that the IDs are the same;
the error detection strategy for multiple rows of data items with the same message ID comprises the following steps:
reading a plurality of rows of data items of the same message ID in the CAN communication matrix;
checking the consistency of message related data items in different rows of the same message ID, checking the repeatability of signal related data items in different rows of the same message ID, checking the interference of signal arrangement between different rows of the same message ID, and checking whether controllers sending the same message ID in different rows are the same;
if the error is detected, sequentially recording error information, prompting relevant error information after all rows are detected, and quitting executing the error detection strategy of the multi-row data items with the same message ID; if no error exists, the execution of the error detection strategy is finished, and the completion of the check is prompted.
Optionally, the checking consistency of packet data items in different rows of the same packet ID includes:
and checking whether any one of the message names, the message lengths and the message cycles in different rows of the same message ID has inconsistent rows, if so, the error is detected, and if not, the correctness is detected.
Optionally, the checking for repeatability of signal data items in different rows comprises:
and checking whether the signal names and the initial bits in different rows of the same message ID are repeated, if so, determining that the signal names and the initial bits are wrong, and otherwise, determining that the signal names and the initial bits are correct.
Optionally, the checking the interference of signal arrangement between different rows of the same packet ID includes:
calculating and checking whether signal arrangement between each line of the same message ID has interference according to the arrangement format, the start bit and the signal length in each line, if so, the signal arrangement is wrong, and if not, the signal arrangement is correct;
optionally, the checking whether the controllers sending the same packet ID in different rows are the same includes:
and checking whether the controllers which send the same message ID in each row are the same, if so, judging that the controllers are correct, and otherwise, judging that the controllers are wrong.
The invention has the beneficial effects that:
an error detection strategy corresponding to the CAN communication matrix is formulated according to the coding rule of CAN signals in the CAN communication matrix, and the error detection strategy comprises an error detection strategy for the numerical range of data items in messages and signals, an error detection strategy for each row of arrangement format and an error detection strategy for a plurality of rows of data items with the same message ID; the error detection strategy is executed by receiving the error detection strategy, reading the header row of the CAN communication matrix, identifying the columns of all project headers in the header row, executing the error detection strategy, detecting errors of all projects in the CAN communication matrix according to the project headers, recording and prompting the detected error information, automatically and quickly executing the error detection strategy according to the CAN signal coding rule, finding the errors in the CAN communication matrix, and giving out the prompt information, thereby effectively improving the error detection efficiency of the CAN communication matrix and reducing the automobile development cost.
The apparatus of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 shows a step diagram of an error detection method for a CAN communication matrix of a motor vehicle according to the invention.
Fig. 2 is a flowchart showing a specific application example of the error detection method of the CAN communication matrix of the automobile according to the present invention.
Detailed Description
In the prior art, when an engineer maintains a CAN communication matrix, a lot of time is consumed to find whether a signal has numerical errors or not, whether the signal has errors such as signal interference and the like or not, the number of signals is large, time and labor are consumed for finding the errors, and accordingly development cost of an automobile is high.
The method of the invention CAN automatically and rapidly find out the error in the CAN communication matrix according to the CAN signal coding rule and give out prompt information.
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 is a step diagram illustrating an error detection method of a CAN communication matrix of an automobile according to the present invention.
As shown in fig. 1, an error detection method for a CAN communication matrix of an automobile, where the CAN communication matrix is a table for recording basic information of messages and signals of each node, and includes:
step S1: reading a header row of the CAN communication matrix, and identifying the columns of all item headers in the header row;
step S2: executing an error detection strategy corresponding to the CAN communication matrix, detecting errors of all data items in the CAN communication matrix according to the project titles, and recording and prompting detected error information;
the error detection strategy is formulated according to the encoding rule of the CAN signal in the CAN communication matrix, and comprises an error detection strategy for the numerical range of data items in the message and the signal, an error detection strategy for each row of arrangement format and an error detection strategy for a plurality of rows of data items with the same message ID.
Specifically, the CAN communication matrix is shown in the following table:
CAN communication matrix data table
Wherein, the item title in the title row of CAN communication matrix includes: message name, message ID, message length, message period, signal name, arrangement format, start bit, signal length and precision.
In this embodiment, the error detection policy is formulated according to the coding rule of the CAN signal in the CAN communication matrix. The error detection strategies include error detection strategies for the numerical range of the data items in the messages and signals, error detection strategies for each row arrangement format, and error detection strategies for multiple rows of data items with the same message ID.
The error detection strategy for the numerical range of the data items in the messages and signals specifically includes:
reading data items according to the title and rows in sequence, checking whether the numerical value in each data item of each row accords with a preset numerical range, if an error is detected, recording error information in sequence, prompting relevant error information after all rows are checked, and quitting executing an error detection strategy for the numerical range of the data items in the message and the signal; if no error exists, executing the error detection strategy for each row arrangement format. Wherein, and check whether the numerical value in each data item of every row accords with the numerical value scope preserved, include: checking whether the data value of the length of each line of messages accords with a preset length value range, if so, judging that the data value is correct, and otherwise, judging that the data value is wrong; checking whether the data value of each line of message period is a number not less than 0, if so, the data value is correct, and if not, the data value is wrong; checking whether the data value of the initial bit of each row is a number not less than 0, if so, the data value is correct, and if not, the data value is wrong; checking whether the data value of each row of signal length is a number greater than 0, if so, the data value is correct, and if not, the data value is wrong; and checking whether the data value of each row of precision is a number which is not 0, if so, the data value is correct, and if not, the data value is wrong.
The error detection strategy for each row arrangement format specifically includes:
checking whether the arrangement format of each row has an item which is inconsistent, if so, sequentially recording error information, prompting relevant error information after checking all rows, and quitting executing an error detection strategy for the arrangement format of each row; and if not, executing an error detection strategy for the multiple rows of data items with the same message ID. The message IDs in the CAN communication matrix are arranged in a table in a row-by-row sequencing mode from small to large, and are sequenced in a row-by-row mode from small to large according to initial bits under the condition that the IDs are the same; the error detection strategy for multiple rows of data items with the same message ID comprises the following steps: reading a plurality of rows of data items of the same message ID in the CAN communication matrix; checking the consistency of message related data items in different rows of the same message ID, checking the repeatability of signal related data items in different rows of the same message ID, checking the interference of signal arrangement between different rows of the same message ID, and checking whether controllers sending the same message ID in different rows are the same; if the error is detected, error information is recorded in sequence, after all rows are detected, relevant error information is prompted, and execution of an error detection strategy of a plurality of rows of data items with the same message ID is quitted; if no error exists, the execution of the error detection strategy is finished, and the completion of the check is prompted.
The method for checking the consistency of the message data items in different rows of the same message ID specifically comprises the following steps: and checking whether any one of the message names, the message lengths and the message periods in different rows of the same message ID has inconsistent rows, if so, determining that the row is wrong, and otherwise, determining that the row is correct.
Wherein checking the repeatability of the signal data items in different rows comprises:
and checking whether the signal names and the initial bits in different rows of the same message ID are repeated, if so, determining that the signal names and the initial bits are wrong, and otherwise, determining that the signal names and the initial bits are correct.
The interference of signal arrangement between different rows of the same message ID is checked, and the method comprises the following steps:
calculating and checking whether signal arrangement between each line of the same message ID has interference according to the arrangement format, the initial bit and the signal length in each line, if so, the signal arrangement is wrong, and otherwise, the signal arrangement is correct;
checking whether controllers sending the same message ID in different rows are the same or not, wherein the checking comprises the following steps:
and checking whether the controllers which send the same message ID in each row are the same, if so, judging that the controllers are correct, and otherwise, judging that the controllers are wrong.
In a specific application scenario, the execution body of the error detection method prefers VBA code, reads the CAN communication matrix through VBA code reception and identification, and executes each error detection policy. VBA (Visual Basic for applications) is the prior art, is a macro language of Visual Basic, and can be mainly used for expanding the application program functions of Windows, in particular Microsoft Office software.
Referring to fig. 2, in this specific application scenario, the error detection method for the CAN communication matrix of the automobile specifically includes the following steps:
step S101: reading the title of the communication matrix, and identifying the column where the title of the communication matrix is located, such as the message name, the message ID, the message period and the like;
step S102: the data is read in lines in sequence, by title, and the following items are checked: whether the message length is correct (A1), whether the message period is a number not less than 0 (A2), whether the start bit is a number not less than 0 (A3), whether the signal length is a number greater than 0 (A4), whether the precision is a number not 0 (A5), and the like;
step S103: if the error is detected, error information is recorded in sequence, and after all rows are detected, relevant error information is prompted and code execution is quitted; if no error exists, continuing to execute the next step;
step S104: checking whether the arrangement formats of all the lines have inconsistent items (B1), if so, prompting relevant error information and quitting code execution; if not, continuing to execute the next step;
step S105: sorting the messages from small to large according to the ID of the messages and from small to large according to the initial bits under the condition that the IDs are the same;
step S106: reading all signals of the same ID, checking the following items (whether the message name has a line which is inconsistent (C1), whether the message length has a line which is inconsistent (C2), whether the message period has a line which is inconsistent (C3), whether the signal name is repeated (C4), whether the start bit is repeated (C5), checking whether the signal arrangement of the ID has interference according to the arrangement format/the start bit/the signal length (C6), and whether the controllers sending the ID are different from the same controller (C7));
step S107: if the error is detected, error information is recorded in sequence, and after all rows are detected, relevant error information is prompted and code execution is quitted; if no error exists, continuing to execute the next step;
step S108: and finishing execution and prompting that the check is finished.
The embodiment adopts VBA codes, directly runs, CAN automatically and quickly find out errors in the CAN communication matrix according to CAN signal coding rules, and gives prompt information.
In conclusion, the method CAN automatically and quickly execute the error detection strategy according to the CAN signal coding rule, find out the errors in the CAN communication matrix and give out prompt information, thereby effectively improving the error detection efficiency of the CAN communication matrix and reducing the automobile development cost.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (7)
1. An error detection method for a CAN communication matrix of an automobile, wherein the CAN communication matrix is a table for recording basic information of messages and signals of each node, and the method is characterized by comprising the following steps:
reading a header row of the CAN communication matrix, and identifying the columns of all item headers in the header row;
executing an error detection strategy corresponding to the CAN communication matrix, detecting errors of all data items in the CAN communication matrix according to the project titles, and recording and prompting detected error information;
the error detection strategy is formulated according to the encoding rule of CAN signals in the CAN communication matrix, and comprises an error detection strategy for the numerical range of data items in messages and signals, an error detection strategy for each row of arrangement format and an error detection strategy for a plurality of rows of data items with the same message ID;
the error detection strategy for the numerical range of the data items in the messages and signals comprises the following steps:
reading data items according to the title and rows in sequence, checking whether the numerical value in each data item in each row conforms to a preset numerical range, if an error is detected, recording error information in sequence, prompting relevant error information after all rows are checked, and quitting executing the error detection strategy for the numerical range of the data items in the message and the signal; if no error exists, executing the error detection strategy for each row arrangement format;
the error detection strategy for each row arrangement format comprises the following steps:
checking whether the arrangement format of each row has an item which is inconsistent, if so, sequentially recording error information, prompting relevant error information after checking all rows, and quitting executing the error detection strategy for the arrangement format of each row; if not, executing the error detection strategy of the multiple lines of data items with the same message ID;
arranging the message IDs in the CAN communication matrix in a table in a row-by-row sequencing manner from small to large, and sequencing the message IDs in a row-by-row manner from small to large according to initial bits under the condition that the IDs are the same;
the error detection strategy for multiple rows of data items with the same message ID comprises the following steps:
reading a plurality of rows of data items of the same message ID in the CAN communication matrix;
checking the consistency of message related data items in different rows of the same message ID, checking the repeatability of signal related data items in different rows of the same message ID, checking the interference of signal arrangement between different rows of the same message ID, and checking whether controllers sending the same message ID in different rows are the same;
if the error is detected, sequentially recording error information, prompting relevant error information after all rows are detected, and quitting executing the error detection strategy of the multi-row data items with the same message ID; if no error exists, the execution of the error detection strategy is finished, and the completion of the check is prompted.
2. The method of claim 1 wherein said item header in said header row comprises: message name, message ID, message length, message period, signal name, arrangement format, start bit, signal length and precision.
3. The method of claim 2, wherein said checking whether the values in the respective data entries of each row conform to a predetermined range of values comprises:
checking whether the data value of the message length of each line accords with a preset length value range, if so, determining that the data value is correct, and otherwise, determining that the data value is wrong;
checking whether the data value of each row of the message period is a number not less than 0, if so, judging that the data value is correct, and if not, judging that the data value is wrong;
checking whether the data value of the initial bit of each row is a number not less than 0, if so, the data value is correct, and if not, the data value is wrong;
checking whether the data value of the signal length of each row is a number greater than 0, if so, the data value is correct, and if not, the data value is wrong;
and checking whether the data value of the precision of each row is a number which is not 0, if so, the data value is correct, and if not, the data value is wrong.
4. The method of claim 1, wherein said checking for consistency of message data items in different rows of a same message ID comprises:
and checking whether any one of the message names, the message lengths and the message cycles in different rows of the same message ID has inconsistent rows, if so, the error is detected, and if not, the correctness is detected.
5. The method of claim 1 wherein said checking for repeatability of signal data items in different rows comprises:
and checking whether the signal names and the initial bits in different rows of the same message ID are repeated, if so, determining that the signal names and the initial bits are wrong, and otherwise, determining that the signal names and the initial bits are correct.
6. The method of claim 1, wherein said checking for interference with signal placement between different rows of the same message ID comprises:
and calculating and checking whether signal arrangement between each line of the same message ID has interference according to the arrangement format, the start bit and the signal length in each line, if so, determining that the signal arrangement is wrong, and otherwise, determining that the signal arrangement is correct.
7. The method of claim 1, wherein said checking whether controllers in different rows that send the same message ID are the same comprises:
and checking whether the controllers which send the same message ID in each row are the same controller, if so, judging that the controllers are correct, and otherwise, judging that the controllers are wrong.
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| CN114465889A (en) * | 2022-01-07 | 2022-05-10 | 东风柳州汽车有限公司 | Switching method for vehicle configuration |
| CN114710479B (en) * | 2022-03-31 | 2023-12-01 | 三一电动车科技有限公司 | Fault diagnosis method, device and system |
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