CN111638703A - Method for improving diagnosis efficiency of automobile offline diagnosis system - Google Patents
Method for improving diagnosis efficiency of automobile offline diagnosis system Download PDFInfo
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- CN111638703A CN111638703A CN202010473609.6A CN202010473609A CN111638703A CN 111638703 A CN111638703 A CN 111638703A CN 202010473609 A CN202010473609 A CN 202010473609A CN 111638703 A CN111638703 A CN 111638703A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- 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 discloses a method for improving the diagnosis efficiency of an automobile offline diagnosis system, which comprises the following operation steps: burning the compression algorithm into the MP-BOX chip by taking the MP-BOX chip as a writing tool; transporting the vehicle to be subjected to writing with the controller assembled to an EOL writing station from a production line; connecting an OBD interface of the vehicle to be flashed and a computer through an MP-BOX chip; selecting a corresponding flash software version according to the model of the vehicle to be flashed, inputting the whole vehicle data in the upper computer into an MP-BOX chip, compressing the data by using a compression algorithm, and then transmitting the compressed data to each controller of the vehicle; and finishing programming of the vehicle controller and finishing the flashing. The compression algorithm used in the method provided by the invention can effectively search bytes appearing in the data, and the matched index is updated in the cache region in time along with the addition of the characters; the residual bytes are filled by tracking the repeated small-length mode in the cache region, so that the number of candidate data groups is reduced, and the filling structure in the algorithm is optimized to improve the efficiency.
Description
Technical Field
The invention belongs to the technical field of network communication, and particularly relates to a method for improving the diagnosis efficiency of an automobile offline diagnosis system.
Background
With the rapid development of the automobile industry and the improvement of the demand of people on high-tech configuration of automobiles, the algorithm in the automobile controller is more and more complex, the number of sensors is continuously increased, and the data interaction amount on the CAN network of the whole automobile is increased. With the increase of the proportion of an electric control system in an automobile, the improvement of the automation degree of vehicle offline and the acceleration of production takt, the whole automobile offline increasingly depends on an automobile offline diagnosis system, hereinafter referred to as an EOL system. When the vehicle is assembled in a final assembly plant, the programming function of EOL is generally adopted to write on the vehicle controller; the programming mode encapsulates information such as logic, data and the like of each automobile controller, and the data are flashed into each automobile controller through the OBD diagnosis interface by the flash tool MP-BOX.
Today, the production line is increasingly automated with increasing automobile production, which inevitably places higher demands on the automobile writing speed. When the controller is flushed according to the existing increasing data volume, the flushing speed often cannot keep up with the pipeline speed. Along with the improvement of the electrical appliance degree of the automobile, more and more controllers needing to be written with a brush are needed, the production efficiency is seriously influenced, and the wire stop happens.
Disclosure of Invention
In view of the above requirements for the EOL flash compression algorithm in the automobile production process, the invention provides a method for improving the diagnosis efficiency of an automobile offline diagnosis system, which applies a novel data compression algorithm to the EOL flash in the automobile production process, so that the efficiency of data transmission is improved through the compression algorithm in the flash process, and the control strategy of the whole automobile is activated; the aim of improving the brushing efficiency is achieved by compressing the data volume, so that the efficiency of an EOL station is improved.
The invention provides a method for improving the diagnosis efficiency of an automobile offline diagnosis system in order to overcome the technical defects, wherein an MP-BOX chip is taken as a flash writing tool, a compression algorithm model is established, and the compression algorithm model is burnt into the MP-BOX chip of the flash writing tool; connecting the MP-BOX chip to an OBD interface of a vehicle to be flashed, and connecting the other end of the MP-BOX chip to a computer; selecting a corresponding flash software version in EOL upper computer software in a computer according to the model of a vehicle to be flashed, inputting the whole vehicle data in the upper computer into an MP-BOX chip, performing data compression by using a compression algorithm, and transmitting the compressed data to each controller of the vehicle after the data compression is completed; the vehicle to be flashed is flashed on line so as to complete the programming of the whole vehicle controller and the flashing detection; wherein the compression algorithm model comprises the steps of:
s1, a receiving module receives vehicle data transmitted from an upper computer; searching repeated data bytes, timely updating matched indexes in a cache region along with the addition of characters, filling residual bytes in a pointer sequence by tracking repeated small-length patterns, and finally backing to find the position of the last matched character in the cache region according to the indexes;
s2, calculating the number of bytes matched currently;
s3, when the table tail is not reached by matching, establishing a function c = readNextByte () to read the next byte;
s4, if the current matching number is larger than 0, trying next matching, and if the matching is successful, updating the number of bytes matched; if the matching is unsuccessful and the number of matched bytes is more than or equal to 2, performing additional cancellation, and successfully compressing the matched bytes; if the matched byte number is less than 2, outputting according to the original byte; finishing the matching until the matching number is reduced to 0;
and S5, if the current matching number is equal to 0, then carrying out a new round of search, if the matching is unsuccessful, outputting according to the original byte, setting the matching number to be 0, and if the matching is successful, additionally offsetting, and setting the matching number to be 1.
Further, in the above technical solution, in the vehicle data, when each byte appears for the first time, it is a pointer 1, and when each byte appears for the next time, it is a pointer 2.
Further, in the above technical solution, in the compression algorithm in the MP-BOX chip, the matching module matches the entire vehicle data bytes, and after all data matching is completed, the matching number is stored in the output module.
Further, in the above technical solution, when the cache region module is filled, if the last byte conforms to the filling of the small-length mode, the mode may be applicable; if the padding pattern can not be satisfied, selecting a new padding pattern consisting of the next byte and the last three bytes of the previous small-length padding pattern for padding.
Further, in the above technical solution, the controller includes an instrument, a vehicle body controller, an engine controller, an airbag controller, a vehicle body stabilizing system, a multimedia system, and a transmission.
Compared with the prior art, the invention has the beneficial effects that:
1. the compression algorithm can effectively search bytes appearing in the data, and the matched index is updated in a cache region in time along with the addition of the characters;
2. the compression algorithm optimizes the traditional 0 filling mode by tracking the repeated small-length filling mode in the cache region, reduces the number of candidate data groups, and optimizes the filling structure in the algorithm to improve the efficiency;
3. the compression algorithm of the invention improves the index efficiency of the same data volume in the cache by matching the same bytes of data and adding offset, and compresses the data volume;
4. the compression algorithm in the invention is suitable for the data rule of EOL (Ethernet over coax) flash, and the flash efficiency of the whole vehicle on the general assembly line is greatly improved when the compression algorithm is applied to the EOL flash. After the transmission data is compressed, under the condition that the transmission mode is not changed, the time of staying at the EOL station before the vehicle is off-line can be reduced from 25 minutes to 10 minutes on average, so that the overall production efficiency is improved.
Description of the drawings:
FIG. 1 is an overall step of the compression algorithm application of the present invention;
FIG. 2 is an algorithm step of the compression algorithm of the present invention;
FIG. 3 is a diagram of an efficient method for searching bytes in the compression algorithm of the present invention;
FIG. 4 illustrates a small-length padding pattern in the compression algorithm of the present invention;
FIG. 5 is a method for optimizing the filling pattern matching of the last byte in the compression algorithm according to the present invention.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides a method for improving the diagnosis efficiency of an automobile offline diagnosis system, which comprises the following specific steps:
when a vehicle to be brushed passes through steps of stamping, welding, vehicle body, coating, final assembly and the like, and after the assembly of each controller is completed (each controller comprises an instrument, a vehicle body controller, an engine controller, an airbag controller, a vehicle body stabilizing system, a multimedia system, a gearbox and the like), the vehicle flows to an EOL brushing station along with a production line, and one end of an MP-BOX chip is connected to an OBD interface of the vehicle to be brushed. At the moment, a compression algorithm model established by taking the MP-BOX chip as a writing tool is burnt in the MP-BOX chip, and the other end of the MP-BOX chip is connected with a master control computer. Selecting a corresponding flash software version in EOL upper computer software in a computer according to the model of a vehicle to be flashed, inputting the whole vehicle data of the vehicle in the upper computer into an MP-BOX chip, performing data compression by using a compression algorithm, transmitting the successfully compressed data back to each controller of the vehicle by the computer through the MPBOX after the data compression is completed, checking whether the flash is successful by an EOL system, and removing the MPBOX after the flash is successful to complete the whole vehicle programming.
Taking the brushing flow of the national six-project engine control unit of the company as an example, firstly, the EOL system sends the following UDS diagnosis commands to the engine control unit through the MP-BOX in sequence: a programming mode session (1002), a request security verification seed (2705), a verification key (2706), a routine control erase controller memory (3101), a request download (34); then the data in the variable Block and the Dataset Block which are required to be written in the EOL by the engine control unit are transmitted to the MP-BOX, and data compression is carried out according to the compression algorithm in the invention; dividing the compressed data into packets, writing the compressed data into an engine control unit according to a division sequence through a UDS (Universal description language) flash command (36), verifying the written data packet through a routine control CheckSum command (31010202), and completing the flash after the verification is successful; the EOL equipment outputs a controller flashing report according to the verification result, all controllers are successfully flashed, namely the vehicle is judged to be in a qualified state at the EOL station, and the production line continues; if not, the system is transferred to an auxiliary line for resolution.
The novel compression algorithm in the invention can realize the compression of data volume according to the following steps:
s1, a receiving module receives vehicle data transmitted from an upper computer; searching repeated data bytes, timely updating matched indexes in a cache region along with the addition of characters, filling in a pointer sequence by tracking repeated small-length modes, and finally backing back to the cache region to find the position of the last matched character according to the indexes;
s2, calculating the number of bytes matched currently;
s3, when the table tail is not reached by matching, establishing a function c = readNextByte () to read the next byte;
s4, if the current matching number is larger than 0, trying next matching, and if the matching is successful, updating the number of bytes matched; if the matching is unsuccessful and the number of matched bytes is more than or equal to 2, performing additional cancellation, and successfully compressing the matched bytes; if the matched byte number is less than 2, outputting according to the original byte; finishing the matching until the matching number is reduced to 0;
and S5, if the current matching number is equal to 0, then carrying out a new round of search, if the matching is unsuccessful, outputting according to the original byte, setting the matching number to be 0, and if the matching is successful, additionally offsetting, and setting the matching number to be 1.
The novel compression algorithm application computer language in the present invention can be expressed as follows:
matches = Ø // positions at which the last numMatched characters werefound in the lookback buffer
numMatched = 0 // number of currently matched bytes
while not EOF:
c = readNextByte()
if numMatched>0: // try to continue match at given positions
update(matches, c) // check which starting positions are still valid
if matches != Ø: // still matches
numMatched ++
else: // does not match any more
if numMatched>= 2:
append offset // beginning at any of ‘matches’, numMatched bytes
else:
append raw byte c[-1]// previous c
numMatched = 0, matches = Ø
if numMatched == 0: // new search
matches = find(c)
if matches == Ø:
append raw byte c
numMatched = 0
else:
numMatched = 1
the method for searching bytes by using the novel compression algorithm comprises the following steps: the matched index is updated in the cache module in time along with the addition of the character, and the management of the matched item is realized by matching the same byte of the data and adding an offset. Through the management of the matching items, the indexing efficiency of the same data volume in the cache is improved, the compression of the repeated data is realized, and the brushing efficiency is improved. In fig. 3, a in the cache region is repeated data, and data compression can be performed through indexes in the cache region, so that the efficiency of the flash is improved. When the conventional LZ77 compression algorithm is matched successfully, a flag bit is output, and the distance before matching and the matching length are output to realize the matching index.
As shown in fig. 4, the method for optimizing the filling pattern of the novel compression algorithm used in the present invention is: the remaining bytes are filled by tracking repeated small length patterns in the buffer module. Compared with the traditional LZ77 compression algorithm, the LZ77 algorithm processes backward one byte by one byte from the beginning to the end of data to find the longest matching string; and the filling mode of all-0 filling is applied, the filling mode has low efficiency and has too much candidate data, and the small-length filling mode used in the invention ensures that the number of the filling modes is less and the filling efficiency is higher.
As shown in fig. 5, when the novel compression algorithm used in the present invention performs cache module filling, if the last byte conforms to the small-length mode filling, the mode can continue to be applied; if the padding pattern can not be satisfied, selecting a new padding pattern consisting of the next byte and the last three bytes of the previous small-length padding pattern for padding.
With MPBOX without the encapsulated compression algorithm, it takes approximately 25 minutes to flash a dolly, and with the encapsulated compression algorithm, it takes approximately 10 minutes to flash a dolly.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A method for improving the diagnosis efficiency of an automobile offline diagnosis system is characterized in that an MP-BOX chip is taken as a flash tool, a compression algorithm model is established, and the compression algorithm model is burnt into the MP-BOX chip of the flash tool; connecting the MP-BOX chip to an OBD interface of a vehicle to be flashed, and connecting the other end of the MP-BOX chip to a computer; selecting a corresponding flash software version in EOL upper computer software in a computer according to the model of a vehicle to be flashed, inputting the whole vehicle data in the upper computer into an MP-BOX chip, performing data compression by using a compression algorithm, and transmitting the compressed data to each controller of the vehicle after the data compression is completed; the vehicle to be flashed is flashed on line so as to complete the programming of the whole vehicle controller and the flashing detection; wherein the compression algorithm model comprises the steps of:
s1, a receiving module receives vehicle data transmitted from an upper computer; searching repeated data bytes, timely updating matched indexes in a cache region along with the addition of characters, filling residual bytes in a pointer sequence by tracking repeated small-length patterns, and finally backing to find the position of the last matched character in the cache region according to the indexes;
s2, calculating the number of bytes matched currently;
s3, when the table tail is not reached by matching, establishing a function c = readNextByte () to read the next byte;
s4, if the current matching number is larger than 0, trying next matching, and if the matching is successful, updating the number of bytes matched; if the matching is unsuccessful and the number of matched bytes is more than or equal to 2, performing additional cancellation, and successfully compressing the matched bytes; if the matched byte number is less than 2, outputting according to the original byte; finishing the matching until the matching number is reduced to 0;
and S5, if the current matching number is equal to 0, then carrying out a new round of search, if the matching is unsuccessful, outputting according to the original byte, setting the matching number to be 0, and if the matching is successful, additionally offsetting, and setting the matching number to be 1.
2. The method of claim 1, wherein each byte in the vehicle data is pointer 1 when it occurs for the first time and pointer 2 when it occurs for the next time.
3. The method for improving the diagnosis efficiency of the automobile offline diagnosis system according to claim 1 or 2, wherein in the compression algorithm in the MP-BOX chip, the matching of the whole automobile data bytes is performed in the matching module, all the data matching is finished, and the matching number is stored in the output module.
4. The method for improving the diagnosis efficiency of the automobile offline diagnosis system according to claim 1, wherein when the buffer module is filled, if the last byte conforms to the filling of a small-length mode, the mode can be applied; if the padding pattern can not be satisfied, selecting a new padding pattern consisting of the next byte and the last three bytes of the previous small-length padding pattern for padding.
5. The method of claim 1, wherein the controller comprises a meter, a body controller, an engine controller, an airbag controller, a body stabilization system, a multimedia system, and a transmission.
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| CN202010473609.6A CN111638703B (en) | 2020-05-29 | 2020-05-29 | Method for improving diagnosis efficiency of automobile offline diagnosis system |
| PCT/CN2020/125157 WO2021238061A1 (en) | 2020-05-29 | 2020-10-30 | Method for improving diagnosis efficiency of automobile offline diagnosis system |
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| CN202010473609.6A CN111638703B (en) | 2020-05-29 | 2020-05-29 | Method for improving diagnosis efficiency of automobile offline diagnosis system |
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| CN111638703B CN111638703B (en) | 2023-05-09 |
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| WO2021238061A1 (en) * | 2020-05-29 | 2021-12-02 | 南京依维柯汽车有限公司 | Method for improving diagnosis efficiency of automobile offline diagnosis system |
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| CN114968313B (en) * | 2022-07-29 | 2022-11-11 | 江西五十铃汽车有限公司 | Vehicle-mounted terminal offline configuration method, system, storage medium and equipment |
| CN115835161B (en) * | 2022-11-29 | 2024-06-11 | 重庆长安汽车股份有限公司 | Program refreshing method for vehicle, server, vehicle, system and storage medium |
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