CN103678493A - Data storage system and method for monitoring operation of electric automobiles - Google Patents
Data storage system and method for monitoring operation of electric automobiles Download PDFInfo
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Abstract
The invention relates to a data storage system and method for monitoring operation of electric automobiles. The system comprises at least one pre-positioned data acquisition device and a data storage device, the pre-positioned data acquisition devices are arranged in a distributed mode and used for acquiring and storing vehicle data sent by vehicle-mounted terminals and data of power batteries on the automobiles; the data storage device is used for historically storing the data sent by all the pre-positioned data acquisition devices periodically and calling the corresponding vehicles and the historical data in a certain time period for postmortem analysis; the real-time data of the electric automobiles and the real-time data of the power batteries on the automobiles can be acquired, data sources are provided for real-time monitoring of conditions of the automobiles in the running process, meanwhile, the ream-time data are historically stored, and therefore when accidents and faults happen to the automobiles in the running process, the corresponding automobiles and the historical data in the time period can be called for postmortem analysis, and powerful support is provided for daily operation management and safety operation.
Description
Technical field
The invention belongs to electric automobile monitoring operation technical field, relate to a kind of data-storage system, method of electric automobile monitoring operation.
Background technology
Along with coming into operation of a large amount of electric automobiles on market, on electric automobile and car, the safety problem of electrokinetic cell is more and more concerned.After electric automobile puts into effect, for to vehicle, the situation at operational process monitors in real time, the real time data that needs collection vehicle and electrokinetic cell, and the cycle real time data is carried out to historical storage, with convenient vehicle, in operational process, have an accident and during fault, can transfer corresponding vehicle and at that time the historical data of period carry out ex-post analysis.Existing application number is that 201210162966.6 Chinese patent application discloses a kind of car networking data acquisition system, this system only can solve the data acquisition unit that capacity is less and in gatherer process, occur redundant information, lose the problem of useful data, cannot solve whole electric automobile monitoring operation system for a plurality of data acquisition units of distributed setting on a large scale corresponding, the mass of redundancy data occurring in mass data storage process, the problem of obliterated data, just cannot realize and transfer fast vehicle and have an accident or effective historical data during fault is carried out ex-post analysis.
Summary of the invention
The data-storage system, the method that the object of this invention is to provide a kind of electric automobile monitoring operation, to solve loss, the repeated storage problem of a plurality of data acquisition unit corresponding datas of distributed setting, realize and to transfer fast that vehicle has an accident or effective historical data during fault is carried out ex-post analysis.
For the problem that solves the collection of real time data of vehicle to sending on the car-mounted terminal of electric automobile and electrokinetic cell and storage and in real time car-mounted terminal is carried out Long-distance Control,
For achieving the above object, the data-storage system of electric automobile monitoring operation of the present invention comprises:
At least one advance data harvester of distributed setting, for to sending collection and the storage of electrokinetic cell data on vehicle data and car on car-mounted terminal, comprise preposition real-time data base, preposition communication module, real-time data memory module, preposition communication adviser tool and vehicle and electrokinetic cell alerting service module;
Data storage device, the data of sending on each advance data harvester are carried out to historical storage and transfer corresponding vehicle and the historical data of certain period is carried out ex-post analysis for the cycle, comprise vehicle configuration Data dissemination module, real time data synchronization module, history data store module, monitoring real-time data base and monitoring historical data base.
Described preposition communication module is used for and car-mounted terminal communication, gather car-mounted terminal on the electric automobile that send and electrokinetic cell real time data and to car-mounted terminal, issue vehicle-mounted parameter and steering order, comprise communication unit, command remote control unit, vehicle data dispatch thread, vehicle data processing unit and vehicle real time data memory management unit, this vehicle real time data memory management unit is for reading and writing management to vehicle real time data buffer memory, when real time data being detected and change, just writes in buffer memory.
Described real-time data memory module is for periodic region vehicle real time data buffer memory read data, and set up or refresh preposition real time data banked cache, when the record data in preposition real-time data base buffer memory change, data information memory module to real-time data base, comprises real-time data memory thread and real-time database data memory management unit by Data Update.
Described vehicle and electrokinetic cell alerting service module comprise minor alarm unit and intelligent alarm unit.
Described preposition communication adviser tool comprises that vehicle-mounted protocol monitor, preposition real-time cache monitor, preposition real-time storehouse supervision, vehicle mounted communication status surveillance and steering order and vehicle-mounted parameter issue unit.
Described advance data harvester and preposition real-time data base are deployed in preposition communication server, and monitoring historical data base is deployed in historical database server, and vehicle data memory storage and monitoring real-time data base are deployed in application server.
The date storage method technical scheme of electric automobile monitoring operation is as follows: the data acquisition of the method is as follows:
(11) preposition communication module receives the vehicle-mounted original message sending on car-mounted terminal, and packet parsing is become to real time data, writes real time data buffer memory;
(12) preposition communication module is received the message of warning information, E-Packets to vehicle and electrokinetic cell alerting service module, by it, is resolved and is generated alarm data, writes in preposition real-time storehouse; Meanwhile, preposition communication module forwards all original messages that send on vehicle-mounted to preposition communication adviser tool, by it, carries out protocol monitor;
(13) real-time storage module cycle reading out data from real time data buffer memory, and store in real-time data base;
(14) reading out data in the real time data buffer memory in preposition communication adviser tool the past real-time data memory module, is monitored real time data buffer memory by it;
Data storage procedure is as follows:
(21) configuration data distribution module reads in history library the configuration information about vehicle and alarm, and is distributed to the preposition real-time storehouse of each advance data harvester;
(22) real time data synchronously reads the preposition real-time storehouse of each advance data harvester, sets up real time data banked cache, when the data in finding buffer memory change, upgrades the real-time storehouse of monitoring operation system;
(23) the real-time storehouse of the monitoring operation system that reads in history data store module cycle, and set up corresponding data buffer storage, when the data in finding buffer memory change, storage data are to monitoring operation system history library.
Further, monitoring operation system reads corresponding data from monitor real-time storehouse and history library.
In described step (13), in database data cache management, read vehicle real time data buffer memory in real time and form real-time storehouse record, and write real-time database data buffer memory, when detecting when real-time database data buffer memory changes, be just stored in real-time data base.
The data-storage system of electric automobile monitoring operation of the present invention, method, can gather the real time data of electrokinetic cell on electric automobile and car, for vehicle provides data source at the real time monitoring of the situation of operational process, simultaneously, cycle is carried out historical storage to real time data, with convenient vehicle, in operational process, have an accident and during fault, can transfer corresponding vehicle and at that time the historical data of period carry out ex-post analysis, for daily operation management and safe operation provide strong support.Adopt Distributed system design, can dispose as required a plurality of advance data harvesters, improved the access quantity of the car-mounted terminal of vehicle monitoring system; The Distributed Design that carries out to vehicle data collection and historical storage, the extensibility and the dirigibility that improve system; Can to the real time data of a plurality of advance data harvesters, be synchronized to the real-time storehouse of monitoring operation system, take into account extensibility and the dirigibility of promptness, response efficiency and the system of vehicle real time data.Advance data harvester adopts two-level cache: vehicle real time data buffer memory and in real time database data buffer memory, reduce the write operation of real-time data base; In vehicle real time data cache management, when changing, the real time data of above sending just upgrades real time data buffer memory; In database data cache management, read vehicle real time data buffer memory in real time and form real-time storehouse record, and write real-time database data buffer memory, when detecting when real-time database data buffer memory changes, be just stored in real-time data base, reduce the refreshing frequency of real-time data base, improved storage efficiency.Preposition real-time storehouse is set in real time data synchronization module and counts buffer memory, reduce the synchronous data volume of real time data; Monitoring operation system real time data banked cache is set in history data store module, if the data in storehouse do not change in real time, historical storage module is not stored, and reduces redundant information, has improved storage efficiency, has saved storage space.
Accompanying drawing explanation
Fig. 1 is the overall pie graph of the data-storage system of electric automobile monitoring operation;
Fig. 2 is advance data harvester data flow diagram;
Fig. 3 is vehicle data memory storage data flow diagram;
Fig. 4 is the data-storage system arrangement figure of electric automobile monitoring operation.
Embodiment
The data-storage system of electric automobile monitoring operation comprises at least one advance data harvester of data storage device and distributed setting.
1. advance data harvester
Adopt Distributed Design, can dispose as required a plurality of advance data harvesters, to improve the car-mounted terminal access quantity of vehicle monitoring system.Advance data harvester is mainly used in gathering the real time data of electrokinetic cell on the electric automobile that send on car-mounted terminal and car, for the real time monitoring of running state of the vehicle provides data source, comprise preposition communication module, real-time data memory, vehicle and electrokinetic cell alerting service, preposition communication adviser tool.
(1) preposition communication module is used for and car-mounted terminal communication, gather car-mounted terminal on the electric automobile that send and electrokinetic cell real time data and to car-mounted terminal, issue vehicle-mounted parameter and steering order, preposition communication module comprises: communication unit, command remote control unit, vehicle data dispatch thread, vehicle data processing unit, vehicle real time data memory management unit.
Communication unit, for car-mounted terminal in collection vehicle on the electric automobile that send and the real time data of electrokinetic cell, electric automobile real time data comprises vehicle essential information, information about power, mileage information, GPS positional information, car alarming information, and electrokinetic cell real time data comprises electric battery BMS information, battery module monomer information, battery cell information and electrokinetic cell warning message.The vehicle sending on preposition communication module Real-time Collection electric automobile car-mounted terminal and the real time data of electrokinetic cell, and the real time data buffer memory of the vehicle that connects in internal memory, when changing, the data of above sending write real time data buffer memory, if do not change and do not write real time data buffer memory.
Command remote control unit, for car-mounted terminal is issued to steering order, comprising: total calling makes, revises vehicle-mounted parameter instruction, restarts the remote control commands such as vehicle-mounted instruction.
Vehicle data dispatch thread, for the message receiving and the steering order queue that issues are managed, and message is distributed to corresponding processing module and processes.
Vehicle data processing unit, resolves to real time data for the message that vehicle data dispatch thread is forwarded, and submits to vehicle real time data memory management unit.
Vehicle real time data memory management unit for vehicle real time data buffer memory is read and write to management, just writes in buffer memory when it detects real time data and changes.
(2) real-time data memory module, remove vehicle real time data buffer memory read data for the cycle, and set up or refresh real time data banked cache, when the record data in real time data banked cache change, data information memory module just Data Update to real-time data base, comprising: real-time data memory thread, real-time database data cache management.
(3) described vehicle and electrokinetic cell alerting service comprises: vehicle and the service of electrokinetic cell minor alarm and intelligent alarm service.
Vehicle and the service of electrokinetic cell minor alarm are for generating warning information and be stored in real-time data base the packet parsing sending on vehicle-mounted.
Intelligent alarm service, for according to the data in the preposition real-time storehouse of alarm conditions scanning of definition, when finding that there is the abnormal data that meets alarm conditions, produces warning information and is stored in real-time data base.
(4) preposition communication adviser tool is mainly used in monitoring that preposition communication system ruuning situation comprises: vehicle-mounted protocol monitor, preposition real-time cache monitor, preposition real-time storehouse supervision, vehicle mounted communication status surveillance, steering order and vehicle-mounted parameter issue.
Vehicle-mounted protocol monitor, for receiving the original message that preposition communication module forwarded, shows the also content of analytic message.
Preposition real-time cache monitor is for showing the data in preposition real-time buffer memory, to can see intuitively the content of preposition real-time buffer memory by adviser tool at preposition communication adviser tool.
Preposition real-time data base monitors for the data in preposition real-time storehouse are shown at preposition communication adviser tool, to can see intuitively the content in preposition real-time storehouse by adviser tool.
Vehicle mounted communication status surveillance is for communication state between the vehicle-mounted and preposition communication system of real time monitoring.
Steering order and vehicle-mounted parameter issue for by preposition communication adviser tool to the corresponding vehicle-mounted steering order that issues.
Advance data harvester adopts two-level cache: vehicle real time data buffer memory and in real time database data buffer memory, reduce the write operation of real-time data base; In vehicle real time data cache management, when changing, the real time data of above sending just upgrades real time data buffer memory; In database data cache management, read vehicle real time data buffer memory in real time and form real-time storehouse record, and write real-time database data buffer memory, when detecting when real-time database data buffer memory changes, be just stored in real-time data base, reduce the refreshing frequency of real-time data base, improved storage efficiency.
2. vehicle data memory storage
The vehicle data memory storage cycle that is mainly used in is carried out historical storage to collecting the real time data of electrokinetic cell on electric automobile and car, while having an accident with fault in operational process with convenient vehicle, can transfer corresponding vehicle and at that time the historical data of period carry out ex-post analysis, for electric automobile operation and supervisory system provide data source, for daily operation management and safe operation provide strong, firmly support, comprise vehicle configuration Data dissemination module, real time data synchronization module, history data store module, monitoring real-time data base and monitoring historical data base.
(1) vehicle and alarm configuration Data dissemination module are for being distributed to each advance data harvester the configuration information that is disposed at historical data base;
(2) real time data synchronization module is for being synchronized to the real time data database data of each advance data harvester in the real-time data base of monitoring operation system;
(3) history data store module is for being stored in historical data base to the real-time change data cycle of carrying out of electric automobile and electrokinetic cell, this module cycle goes to fetch data in real-time data base, and set up historical data banked cache, when the record data in historical data banked cache change, data information memory module just Data Update to historical data base.
Advance data harvester and the storage system of electric automobile monitoring operation system are deployed in respectively in preposition communication server, historical database server, application server.
Preposition communication server, for disposing advance data harvester and preposition real-time data base, realizes collection and the storage of vehicle and electrokinetic cell real time data;
Historical database server, for disposing historical data base, realizes the cycle storage to real time data;
Application server, for disposing operation surveillance and the operation real-time storehouse of surveillance.
Preposition real-time storehouse is set in real time data synchronization module and counts buffer memory, reduce the synchronous data volume of real time data; Monitoring operation system real time data banked cache is set in history data store module, if the data in storehouse do not change in real time, historical storage module is not stored, and reduces redundant information, has improved storage efficiency, has saved storage space.
Below in conjunction with accompanying drawing, the realization of the data-storage system of this electric automobile monitoring operation is described further.
Figure 1 shows that the structural framing figure of the data-storage system of electric automobile monitoring operation, system is comprised of advance data harvester and vehicle data memory storage.
Advance data harvester, for realizing to sending collection and the memory function of electrokinetic cell data on vehicle data and car on car-mounted terminal on vehicle, for electric automobile monitoring operation system provides basic data source.Comprise that preposition communication module, real-time data memory, vehicle and electrokinetic cell alerting service, preposition communication adviser tool form, specific implementation is as follows:
(1) communication between advance data harvester and car-mounted terminal is by GPRS/3G wireless network, adopt TCP communication, advance data harvester is as the server end of communication, monitor the Communications service port of the machine, car-mounted terminal is as the client of communication, initiatively initiate to connect, both sides' communication process is as follows:
Step 1: both sides shake hands
Both sides set up SOCKET and connect, and are initiatively sent to start to connect frame by car-mounted terminal, and advance data harvester receives that startup connects after frame, sends to start to connect acknowledgement frame to car-mounted terminal; Step 2: authentication
1) on car-mounted terminal, send authentication frame: car-mounted terminal is received to start and connected after acknowledgement frame, to preposition data collector, sends vehicle-mounted authentication frame;
2) advance data harvester is confirmed testing vehicle register: advance data harvester is received after vehicle-mounted authentication frame, in preposition real-time storehouse, whether search registers this vehicle, if registered vehicle turns to step 3, otherwise advance data harvester initiatively cuts out link connection;
Step 3: always calling
1) advance data harvester is confirmed testing vehicle register, then to car-mounted terminal, sends total calling order;
2) car-mounted terminal is received after total calling order, above send acknowledgement frame, and starts upper power transmission electrical automobile real time data and electrokinetic cell real time data;
3) on, send after ED, above send total calling end frame;
Step 4: send on the cycle
Total calling finishes, upper power transmission electrical automobile real time data of car-mounted terminal cycle and electrokinetic cell real time data;
Step 5: if communication interrupt, again from step 1.
(2) advance data harvester receives the vehicle that send on vehicle-mounted and the real time data of electrokinetic cell is handled as follows:
1) advance data harvester receives after data, and data are screened, and rejects invalid data, sets up corresponding vehicle real-time information buffer memory in internal memory;
2) reading out data in the vehicle real time buffer memory of real-time data memory module cycle from internal memory, and be stored to real-time data base.
Vehicle data memory storage be mainly used in the cycle to collect electrokinetic cell on electric automobile and car real time data carry out historical storage, while having an accident with fault in operational process with convenient vehicle, can transfer corresponding vehicle and at that time the historical data of period carry out ex-post analysis, for electric automobile operation and supervisory system provide data source, for providing strong, daily operation management and safe operation firmly support, comprise vehicle configuration Data dissemination module, real time data synchronization module and history data store module, concrete entity mode is as follows:
(1) first, configuration data distribution module is distributed to each advance data harvester the configuration information that is disposed at historical data base;
(2) secondly, real time data synchronization module real time data database data in each advance data harvester simultaneously to the real-time data base of monitoring operation system, and the reading the record of the real-time data base on each advance data harvester server of cycle, and in internal memory, set up real time data banked cache, when the record in real time data banked cache changes, real time data synchronization module is updated to real-time data record in the real-time storehouse of monitoring operation system;
(3) last, history data store module is stored in the real-time change data cycle of carrying out of electric automobile and electrokinetic cell in historical data base, and the cycle go to fetch data in real-time data base, and set up historical data banked cache, when the record data in historical data banked cache change, data information memory module just Data Update to historical data base.
Figure 2 shows that vehicle front data collector data flow diagram, the whole data flow of vehicle front data collector is as described below:
(1) the vehicle-mounted original message sending on car-mounted terminal, preposition communication module receives original message, and packet parsing is become to real time data, writes real time data buffer memory;
(2) preposition communication module is received the message of warning information, E-Packets to vehicle and electrokinetic cell alerting service module, by it, is resolved and is generated alarm data, writes in preposition real-time storehouse; Meanwhile, preposition communication module forwards all original messages that send on vehicle-mounted to preposition communication adviser tool, by it, carries out protocol monitor;
(3) real-time storage module cycle reading out data from real time data buffer memory, and store in real-time data base;
(4) reading out data in the real time data buffer memory in preposition communication adviser tool the past real-time data memory module, is monitored real time data buffer memory by it.
Said process is that vehicle-mounted original message becomes the whole data flow of collection of real time data to final warehouse-in.
Figure 3 shows that vehicle data memory storage data flow diagram, the whole data flow of vehicle data memory storage is as described below:
(1) configuration data distribution module reads in history library the configuration information about vehicle and alarm, and is distributed to the preposition real-time storehouse of each advance data harvester;
(2) real time data synchronously reads the preposition real-time storehouse of each advance data harvester, sets up real time data banked cache, when the data in finding buffer memory change, upgrades the real-time storehouse of monitoring operation system;
(3) the real-time storehouse of the monitoring operation system that reads in history data store module cycle, and set up corresponding data buffer storage, when the data in finding buffer memory change, storage data are to monitoring operation system history library;
(4) monitoring operation system reads corresponding data from the real-time storehouse of monitoring operation system and history library, and the real-time storehouse of monitoring operation system and history library are the Data Sources that wherein monitors and show.
Said process is vehicle data memory storage data flow diagram, and describing data in preposition real-time data base becomes to final warehouse-in the whole data flow that lasts data.
Figure 4 shows that advance data harvester and the memory storage deployment diagram of electric automobile monitoring operation system, specifically dispose as described below:
System is disposed and is disposed according to three parts: 1) preposition communication server; 2) historical database server; 3) application server;
(1) preposition communication server, for disposing advance data harvester and preposition real-time data base, according to the size of vehicle in use scale, can dispose one or more preposition communication server;
(2) historical database server, for disposing historical data base;
(3) application server, for disposing the real-time storehouse of monitoring operation system, data storage device and monitoring operation.
It should be noted last that: above embodiment is the non-limiting technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the art is to be understood that; Still can modify or be equal to replacement the present invention, and not depart from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. the data-storage system of electric automobile monitoring operation, is characterized in that, comprising:
At least one advance data harvester of distributed setting, for to sending collection and the storage of electrokinetic cell data on vehicle data and car on car-mounted terminal, comprise preposition real-time data base, preposition communication module, real-time data memory module, preposition communication adviser tool and vehicle and electrokinetic cell alerting service module;
Data storage device, the data of sending on each advance data harvester are carried out to historical storage and transfer corresponding vehicle and the historical data of certain period is carried out ex-post analysis for the cycle, comprise vehicle configuration Data dissemination module, real time data synchronization module, history data store module, monitoring real-time data base and monitoring historical data base.
2. the data-storage system of electric automobile monitoring operation according to claim 1, it is characterized in that: described preposition communication module is used for and car-mounted terminal communication, gather car-mounted terminal on the electric automobile that send and electrokinetic cell real time data and to car-mounted terminal, issue vehicle-mounted parameter and steering order, comprise communication unit, command remote control unit, vehicle data dispatch thread, vehicle data processing unit and vehicle real time data memory management unit, this vehicle real time data memory management unit is for reading and writing management to vehicle real time data buffer memory, when real time data being detected and change, just write in buffer memory.
3. the data-storage system of electric automobile monitoring operation according to claim 1, it is characterized in that: described real-time data memory module is for periodic region vehicle real time data buffer memory read data, and set up or refresh preposition real time data banked cache, when the record data in preposition real-time data base buffer memory change, data information memory module to real-time data base, comprises real-time data memory thread and real-time database data memory management unit by Data Update.
4. the data-storage system of electric automobile monitoring operation according to claim 1, is characterized in that: described vehicle and electrokinetic cell alerting service module comprise minor alarm unit and intelligent alarm unit.
5. the data-storage system of electric automobile monitoring operation according to claim 1, is characterized in that: described preposition communication adviser tool comprises that vehicle-mounted protocol monitor, preposition real-time cache monitor, preposition real-time storehouse supervision, vehicle mounted communication status surveillance and steering order and vehicle-mounted parameter issue unit.
6. according to the data-storage system of the electric automobile monitoring operation described in any one in claim 1-5, it is characterized in that, described advance data harvester and preposition real-time data base are deployed in preposition communication server, monitoring historical data base is deployed in historical database server, and vehicle data memory storage and monitoring real-time data base are deployed in application server.
7. a date storage method for electric automobile monitoring operation, is characterized in that, the data acquisition of the method is as follows:
(11) preposition communication module receives the vehicle-mounted original message sending on car-mounted terminal, and packet parsing is become to real time data, writes real time data buffer memory;
(12) preposition communication module is received the message of warning information, E-Packets to vehicle and electrokinetic cell alerting service module, by it, is resolved and is generated alarm data, writes in preposition real-time storehouse; Meanwhile, preposition communication module forwards all original messages that send on vehicle-mounted to preposition communication adviser tool, by it, carries out protocol monitor;
(13) real-time storage module cycle reading out data from real time data buffer memory, and store in real-time data base;
(14) reading out data in the real time data buffer memory in preposition communication adviser tool the past real-time data memory module, is monitored real time data buffer memory by it;
Data storage procedure is as follows:
(21) configuration data distribution module reads in history library the configuration information about vehicle and alarm, and is distributed to the preposition real-time storehouse of each advance data harvester;
(22) real time data synchronously reads the preposition real-time storehouse of each advance data harvester, sets up real time data banked cache, when the data in finding buffer memory change, upgrades the real-time storehouse of monitoring operation system;
(23) the real-time storehouse of the monitoring operation system that reads in history data store module cycle, and set up corresponding data buffer storage, when the data in finding buffer memory change, storage data are to monitoring operation system history library.
8. the date storage method of electric automobile monitoring operation according to claim 7, is characterized in that: monitoring operation system reads corresponding data from monitor real-time storehouse and history library.
9. according to the date storage method of the electric automobile monitoring operation described in claim 7 or 8, it is characterized in that: in described step (13), in database data cache management, read vehicle real time data buffer memory in real time and form real-time storehouse record, and write real-time database data buffer memory, when detecting when real-time database data buffer memory changes, be just stored in real-time data base.
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| CN109704199B (en) * | 2018-12-29 | 2020-02-04 | 明光利拓智能科技有限公司 | Multithreading bridge crane data acquisition processing system and method |
| CN110362358A (en) * | 2019-06-24 | 2019-10-22 | 京东数字科技控股有限公司 | The management method and system of configuration data |
| CN112307077A (en) * | 2019-12-11 | 2021-02-02 | 深圳新阳蓝光能源科技股份有限公司 | Data archiving method, device, server and system |
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