CN106708569B - Hot loading method and device for VOBC configuration file in over-the-line train - Google Patents
Hot loading method and device for VOBC configuration file in over-the-line train Download PDFInfo
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Abstract
The invention discloses a hot loading method and a hot loading device for VOBC configuration files in an over-the-line train, wherein the method comprises the following steps: when the current train determines that the train needs to run across lines in the running process, checking whether the configuration file of the line to be run is downloaded; when the configuration file is not downloaded, downloading the configuration file step by step from a storage unit of the train according to system resources occupied by a running VOBC program in each running period of the current train VOBC; after the configuration file downloading is completed, initializing the configuration file step by step in each running period of the VOBC so as to complete the hot loading of the configuration file; the VOBC runs in the memory area occupied by the VOBC and downloads the configuration file in the memory area occupied by the VOBC, wherein the memory area occupied by the VOBC running and the memory area occupied by the configuration file are mutually independent. The method does not need to store the configuration data of all lines in the system memory where the VOBC is located, so that the expandability of the system is stronger, and the VOBC can be operated in a cross-line mode on any more lines.
Description
Technical Field
The invention relates to the field of data processing, in particular to a hot loading method and a hot loading device for VOBC configuration files in an over-the-line train.
Background
In the existing urban rail transit signal system, VOBC (vehicle-mounted controller) needs to store configuration files such as an electronic map of a running route in advance, and a train can only run on the route in which the corresponding configuration file is stored.
Under the large trend of urban rail transit interconnection and intercommunication, more and more signal systems can support train cross-line operation. The fact that the train can only run on the line with the stored corresponding configuration file becomes a main factor for restricting the interconnection and intercommunication of the signal systems,
currently, the train must download profiles for all possible lines in operation before being put into operation and initialize all profiles at the system power-on initialization stage.
In particular, the train must download data before operation, limiting the flexibility of train line crossing; initializing all configuration files during the power-up initialization phase consumes a significant amount of system resources.
Disclosure of Invention
In view of the above problems, the present invention provides a method and apparatus for hot loading VOBC configuration files in an over-the-wire train that overcomes or at least partially solves the above problems.
To this end, in a first aspect, the present invention provides a method for hot loading VOBC configuration files in an over-the-wire train, comprising:
when the current train determines that the train needs to run across lines in the running process, checking whether the configuration file of the line to be run is downloaded;
when the configuration file is not downloaded, downloading the configuration file step by step from a storage unit of the train according to system resources occupied by a running VOBC program in each running period of the current train VOBC; and
after the configuration file downloading is completed, initializing the configuration file step by step in each running period of the VOBC so as to complete the hot loading of the configuration file;
and the memory area occupied by the VOBC operation and the memory area occupied by downloading the configuration file are mutually independent.
Optionally, the step of downloading the configuration file step by step from a storage unit of the train according to the system resource occupied by running the VOBC program includes:
determining the byte number to be downloaded of the configuration file in each operation period according to the system resource occupied by the operation of the VOBC program, and sending a downloading request to the storage unit, wherein the downloading request comprises: the information of the line identification of the configuration file and the byte number to be downloaded;
after receiving the response information of the downloading request returned by the storage unit, downloading partial data of the configuration file in each operation period, wherein the byte number of the partial data is less than or equal to the byte number of the pre-downloading in each operation period.
Optionally, the step of downloading a part of data of the configuration file in each operation cycle includes:
sending a request for downloading a part of data to the storage unit in each running period of the VOBC program;
receiving the partial data sent by the storage unit and a first checksum of the partial data sent by the storage unit;
when the downloading of the partial data is completed, acquiring a second checksum of the downloaded partial data,
comparing the first checksum with the second checksum to determine whether the downloaded part of the data is correct;
when the first checksum and the second checksum are the same, determining that partial data of the configuration file is completely downloaded;
otherwise, in the next operation period, the downloading request of partial data is sent to the storage unit again.
Optionally, the determining, according to the system resource occupied by running the VOBC program, a number of bytes to be downloaded for downloading the configuration file in each running period includes:
and when the configuration file is downloaded to monopolize the CPU, determining the byte number to be downloaded of the configuration file and the downloading time corresponding to the byte number to be downloaded in each operating period according to the system resources occupied by the VOBC.
Optionally, the step of determining the number of bytes to be downloaded for downloading the configuration file in each operation period according to the system resource occupied by operating the VOBC program includes:
and determining the number of bytes downloaded according to the memory information occupied by the running VOBC program, the CPU operation resource and/or the interface resource.
Optionally, the step of initializing the configuration file step by step in each operation cycle of the VOBC includes:
acquiring execution time for limiting initializing the configuration file in each operation period according to memory information of a system, CPU operation resources, interface resources, memory information occupied by operating VOBC programs, and CPU operation resources and/or interface resources;
and in each operation period, initializing the configuration file according to the execution time until the initialization of the configuration file is completed.
Optionally, the method further comprises:
and when the cross-line operation instruction is received, adjusting the pointer for accessing the configuration file to point to the memory area of the configuration file after initialization is completed.
Optionally, configuration files of two lines exist in the memory where the VOBC program is located at the same time.
In a second aspect, the present invention provides a hot-loading apparatus for VOBC configuration files in an over-the-wire train, comprising:
the checking unit is used for checking whether the configuration file of the line to be operated is downloaded or not when the current train determines that the line needs to be operated in a crossing way in the operation process;
the step-by-step downloading unit is used for downloading the configuration file step by step from a storage unit of the train according to system resources occupied by a program for operating the VOBC in each operating period of the current train VOBC when the configuration file is not downloaded;
a step-by-step initialization unit, configured to initialize the configuration file step by step in each operation cycle of the VOBC after the configuration file is downloaded, so as to complete hot loading of the configuration file;
and the memory area occupied by the VOBC operation and the memory area occupied by downloading the configuration file are mutually independent.
In a third aspect, the present invention provides an in-vehicle apparatus comprising: the hot loading device of VOBC configuration files in the over-the-wire train is used for loading the VOBC configuration files in the over-the-wire train.
According to the technical scheme, the hot loading method and the device for the VOBC configuration file in the cross-line train, provided by the invention, realize the hot loading of the configuration file under the condition of not influencing the normal function of the VOBC through a step-by-step downloading and step-by-step initializing mode, and the hot loaded configuration file is stored in an independent system memory, which is different from a storage memory of the configuration file used by a VOBC program, so that the reading of the current configuration file by the VOBC program is not influenced in the hot loading process, the expandability of the system is stronger, and the VOBC can be operated on any number of lines in a cross-line mode.
Drawings
Fig. 1 is a schematic flowchart of a hot loading method for VOBC configuration files in an over-the-wire train according to an embodiment of the present invention;
fig. 2 is a diagram of a relationship between VOBC and a storage cell according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a hot loading device for VOBC configuration files in an over-the-wire train according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention.
Fig. 1 is a schematic flow chart illustrating a hot loading method for an over-the-wire train VOBC configuration file according to an embodiment of the present invention, where as shown in fig. 1, the method of the embodiment includes the following steps:
101. when the current train determines that the train needs to run across lines in the running process, whether the configuration file of the line to be run is downloaded is checked.
102. And when the configuration file is not downloaded, downloading the configuration file step by step from a storage unit of the train according to the system resources occupied by the running VOBC program in each running period of the current train VOBC.
The relationship between the VOBC and the memory cell in this embodiment is shown in fig. 2. The VOBC and the storage unit are both located in the vehicle-mounted device and interact through a vehicle-ground communication network.
It should be noted that the system resource in this step refers to a system resource of an operating system in the vehicle-mounted device, where the VOBC program runs in the operating system, and a configuration file of a line to be switched to run needs to be loaded in the memory.
Further, the VOBC program in the current vehicle-mounted device has a fixed operation period, for example, one period of 200ms or the like, and for this reason, the loading in the present embodiment needs to be completed in a plurality of operation periods because it is called stepwise downloading the configuration file.
103. After the configuration file downloading is completed, initializing the configuration file step by step in each running period of the VOBC so as to complete the hot loading of the configuration file.
In this embodiment, since the duration of completely initializing the configuration file is greater than the running period of the VOBC program, in this embodiment, the initialization of the configuration file is implemented in each running period of a plurality of running periods in a step-by-step manner, and the above description is further described as initializing the configuration file in each running period of the VOBC in a step-by-step manner.
In this embodiment, the memory area occupied by the VOBC operation and the memory area occupied by downloading the configuration file are independent of each other.
In addition, it should be noted that the loading in this embodiment may be understood as hot loading, that is, when the VOBC program runs in the memory, configuration files of other lines are further loaded without interfering with each other.
In the embodiment, the configuration file is hot-loaded in a step-by-step downloading and step-by-step initializing manner without affecting the normal function of the VOBC, and the configuration file hot-loaded in the embodiment is stored in an independent system memory, which is different from a storage memory of the configuration file currently used by the VOBC program, so that it is ensured that the reading of the current configuration file by the VOBC program is not affected in the hot-loading process. Therefore, the configuration data of all lines do not need to be stored in the system memory where the VOBC is located, the expandability of the system is higher, and the VOBC can be operated in a cross-line mode on any more lines.
In an alternative implementation, the method shown in fig. 1 may further include the following step 104 not shown in the figure:
104. and when the cross-line operation instruction is received, adjusting the pointer for accessing the configuration file to point to the memory area of the configuration file after initialization is completed.
It is understood that the cross-line operation command may be sent by the control center or the zone controller, and the embodiment is not limited thereto.
It is understood that step 104 illustrates the configuration file switching process, i.e. the currently used configuration data and the configuration data obtained by hot loading of the VOBC program are stored in two different memory areas, and the access to the configuration data by the VOBC program is based on a pointer to the memory address of the configuration data, so that the currently used configuration data of the VOBC software can be changed by modifying the pointer. After the hot loading of the configuration data (the configuration file mentioned above) is completed, the switching of the configuration file can be realized by changing the current configuration data pointer to the memory area of the configuration data to be hot loaded.
Further, to improve the scalability of the system, usually, configuration files of two lines exist in the memory where the VOBC program is located at the same time. That is, it is not necessary to store configuration files of all lines in a system memory, and in this embodiment, only the configuration file of the currently operating line and the configuration file of the next line to be operated across lines are stored, so that the expandability of the system is enhanced.
For example, the step 102 of downloading the configuration file step by step from the storage unit of the train according to the system resources occupied by running the VOBC program includes the following sub-steps 1021 and 1022 not shown in the figure:
1021. determining the byte number to be downloaded of the configuration file in each operation period according to the system resource occupied by the operation of the VOBC program, and sending a downloading request to the storage unit, wherein the downloading request comprises: the line identification of the configuration file and the byte number to be downloaded.
In this embodiment, when the download function of the system does not monopolize the CPU, the number of bytes to be downloaded for downloading the configuration file in each operation period may be determined according to the system resource occupied by operating the VOBC program;
and if the downloading function of the system exclusively occupies the CPU, namely the configuration file is downloaded and exclusively occupies the CPU, determining the byte number to be downloaded for downloading the configuration file in each operating period and the downloading time corresponding to the byte number to be downloaded according to the system resources occupied by the VOBC.
The download time does not need to be sent to a storage unit, and is only time period information timed in the running period.
The above-mentioned system is a system of the in-vehicle device, and the system resource is a system resource of the in-vehicle device.
Further, in this embodiment, the number of bytes downloaded is determined according to the memory information occupied by running the VOBC program, the CPU operation resource and/or the interface resource.
1022. After receiving the response information of the downloading request returned by the storage unit, downloading partial data of the configuration file in each operation period, wherein the byte number of the partial data is less than or equal to the byte number of the pre-downloading in each operation period.
For sub-step 1022, the following is illustrated:
firstly, sending a downloading request of partial data to the storage unit in each running period of the VOBC program;
secondly, receiving the partial data sent by the storage unit and a first checksum of the partial data sent by the storage unit;
thirdly, when the partial data is downloaded, acquiring a second checksum of the downloaded partial data,
step four, comparing the first checksum with the second checksum to determine whether the downloaded part of data is correct;
when the first checksum and the second checksum are the same, determining that partial data of the configuration file is completely downloaded;
otherwise, in the next operation period, the downloading request of partial data is sent to the storage unit again.
In addition, in another alternative implementation, for example, the configuration file is downloaded step by step in step 102.
At present, a VOBC program has a fixed operation cycle, and when a new configuration file needs to be downloaded, the VOBC program executes a step-by-step download process once per operation cycle, and the occupation of system resources is limited by limiting the execution time or the number of bytes downloaded during the step-by-step download process.
The checksum (such as the first checksum and the second checksum) of the downloaded data should be calculated when the step-by-step downloading is completed each time, and the checksum of the entire configuration file is obtained when the downloading of the entire configuration file is completed, so that the correctness of the content of the downloaded file is obtained. And when the checksum error is detected, the configuration file is downloaded again under the condition that the downloading is considered to be failed.
Particularly, when the downloading function of the configuration file does not monopolize the CPU (is not blocked), only the number of bytes to be downloaded is limited to limit the occupation of the system resources; when the download function monopolizes the CPU, its execution time should also be limited.
In this embodiment, system resources that can be used for hot loading in each operation cycle of the system of the vehicle-mounted device are evaluated, for example, the minimum value of the limiting conditions is taken from the information according to the available memory size, CPU operation resources, interface resources, and other information, and is used for calculating the limiting conditions such as the number of bytes downloaded and the download time of the step-by-step download function.
Further, for example, the step of initializing the configuration file step by step in each operation cycle of the VOBC in step 103 is specifically described as follows:
acquiring execution time for limiting initializing the configuration file in each operation period according to memory information of a system, CPU operation resources, interface resources, memory information occupied by operating VOBC, and CPU operation resources and/or interface resources;
and in each operation period, initializing the configuration file according to the execution time until the initialization of the configuration file is completed.
That is, after the whole configuration file is downloaded into the memory by the step-by-step downloading method, the VOBC program executes the step-by-step initialization process once per operation cycle, and the occupation of the system resources is limited by limiting the execution time of the step-by-step initialization process.
In particular, in this embodiment, the system resource that can be used for hot loading in each operation cycle of the system of the vehicle-mounted device is evaluated, for example, the available memory size, the CPU operation resource, the interface resource, and other information, and the minimum value of the limiting conditions is taken from the information and used for calculating the maximum execution time of the step-by-step initialization function.
Fig. 3 is a schematic structural diagram illustrating a hot loading apparatus for an over-the-wire train VOBC configuration file according to an embodiment of the present invention, and as shown in fig. 3, the apparatus of the embodiment includes: a viewing unit 31, a step-by-step downloading unit 32, and a step-by-step initializing unit 33;
the checking unit 31 is configured to check whether the configuration file of the line to be operated has been downloaded when the train needs to operate across lines in the operation process;
the step-by-step downloading unit 32 is configured to download the configuration file step by step from a storage unit of the train according to system resources occupied by a program for operating the VOBC in each operating period of the current train VOBC when the configuration file is not downloaded;
a step initialization unit 33 is configured to initialize the configuration file step by step in each operation cycle of the VOBC after the configuration file download is completed, so as to complete the hot loading of the configuration file;
and the memory area occupied by the VOBC operation and the memory area occupied by downloading the configuration file are mutually independent.
In an alternative implementation, the step-and-download unit 32 is specifically configured to perform
Determining the byte number to be downloaded of the configuration file in each operation period according to the system resource occupied by the operation of the VOBC program, and sending a downloading request to the storage unit, wherein the downloading request comprises: the information of the line identification of the configuration file and the byte number to be downloaded;
after receiving the response information of the downloading request returned by the storage unit, downloading partial data of the configuration file in each operation period, wherein the byte number of the partial data is less than or equal to the byte number of the pre-downloading in each operation period.
The apparatus of this embodiment can perform the method described in any of the foregoing embodiments, which is described in detail in the above description, and will not be described again here.
The device of the embodiment realizes the hot loading of the configuration file by means of step-by-step downloading and step-by-step initialization under the condition of not influencing the normal function of the VOBC program. The configuration file in the hot loading is stored in an independent system memory, which is different from the storage memory of the configuration file currently used by the VOBC program, so that the reading of the current configuration file by VOBC software is not influenced in the hot loading process.
In this embodiment, the VOBC program does not need to download the configuration data of multiple lines before operation, but only needs to load the data of the line by the hot-loading method when the next line is about to enter, and the consumption of system resources in the hot-loading process is controllable, and the operation of the existing software/program is not affected.
During cross-line operation, the VOBC program is not limited by a configuration file any more and can run on all lines supporting the interconnection function.
Preferably, to realize the controllability of the system resources, configuration data of at most two lines may exist in the system memory at the same time. Therefore, the VOBC program only needs to hot load the configuration data of the next line into the memory by a hot loading method before entering the next line, only the configuration data of the current line and the configuration data of the next line reside in the memory at the same time, and the configuration data of other lines do not need to reside in the memory.
Configuration data of all lines do not need to be stored in a system memory, so that the system has stronger expandability, and the VOBC can be operated on any number of lines in a cross-line mode.
An embodiment of the present invention further provides a vehicle-mounted device, including: the apparatus for hot loading VOBC configuration files in an over-the-wire train as described in any of the above.
Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.
Those skilled in the art will appreciate that the steps of the embodiments may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (9)
1. A method for hot loading VOBC configuration files in an over-the-wire train is characterized by comprising the following steps:
when the current train determines that the train needs to run across lines in the running process, checking whether the configuration file of the line to be run is downloaded;
when the configuration file is not downloaded, downloading the configuration file step by step from a storage unit of the train according to system resources occupied by a running VOBC program in each running period of the current train VOBC; and
after the configuration file downloading is completed, initializing the configuration file step by step in each running period of the VOBC so as to complete the hot loading of the configuration file;
wherein, the memory area occupied by running VOBC program and the memory area occupied by downloading the configuration file are independent;
the step of downloading the configuration file step by step from a storage unit of the train according to the system resource occupied by the running VOBC program comprises the following steps:
determining the byte number to be downloaded of the configuration file in each operation period according to the system resource occupied by the operation of the VOBC program, and sending a downloading request to the storage unit, wherein the downloading request comprises: the information of the line identification of the configuration file and the byte number to be downloaded;
after receiving the response information of the downloading request returned by the storage unit, downloading partial data of the configuration file in each operation period, wherein the byte number of the partial data is less than or equal to the byte number of the pre-downloading in each operation period.
2. The method of claim 1, wherein the step of downloading the portion of the configuration file data during each operating cycle comprises:
sending a request for downloading a part of data to the storage unit in each running period of the VOBC program;
receiving the partial data sent by the storage unit and a first checksum of the partial data sent by the storage unit;
when the downloading of the partial data is completed, acquiring a second checksum of the downloaded partial data,
comparing the first checksum with the second checksum to determine whether the downloaded part of the data is correct;
when the first checksum and the second checksum are the same, determining that partial data of the configuration file is completely downloaded;
otherwise, in the next operation period, the downloading request of partial data is sent to the storage unit again.
3. The method according to claim 1, wherein determining the number of bytes to be downloaded for downloading the configuration file in each operation period according to the system resources occupied by operating the VOBC program comprises:
and when the configuration file is downloaded to monopolize the CPU, determining the byte number to be downloaded of the configuration file and the downloading time corresponding to the byte number to be downloaded in each operating period according to the system resources occupied by the VOBC.
4. The method according to claim 1, wherein the step of determining the number of bytes to be downloaded for downloading the configuration file in each operation period according to the system resources occupied by the operation of the VOBC program comprises:
and determining the number of bytes downloaded according to the memory information occupied by the running VOBC program, the CPU operation resource and/or the interface resource.
5. The method of claim 1, wherein the step of initializing said configuration file step by step in each operation cycle of said VOBC comprises:
acquiring execution time for limiting initializing the configuration file in each operation period according to memory information of a system, CPU operation resources, interface resources, memory information occupied by operating VOBC programs, and CPU operation resources and/or interface resources;
and in each operation period, initializing the configuration file according to the execution time until the initialization of the configuration file is completed.
6. The method of claim 5, further comprising:
and when the cross-line operation instruction is received, adjusting the pointer for accessing the configuration file to point to the memory area of the configuration file after initialization is completed.
7. The method according to any one of claims 1 to 6, wherein there are profiles of two lines in a memory in which said VOBC program is located at the same time.
8. A device for hot loading VOBC configuration files in an over-the-wire train, comprising:
the checking unit is used for checking whether the configuration file of the line to be operated is downloaded or not when the current train determines that the line needs to be operated in a crossing way in the operation process;
the step-by-step downloading unit is used for downloading the configuration file step by step from a storage unit of the train according to system resources occupied by a program for operating the VOBC in each operating period of the current train VOBC when the configuration file is not downloaded;
a step-by-step initialization unit, configured to initialize the configuration file step by step in each operation cycle of the VOBC after the configuration file is downloaded, so as to complete hot loading of the configuration file;
the VOBC runs in an occupied memory area and downloads the configuration file in the occupied memory area, wherein the occupied memory area for VOBC running and the occupied memory area for downloading the configuration file are mutually independent;
the step-by-step downloading unit is specifically configured to:
determining the byte number to be downloaded of the configuration file in each operation period according to the system resource occupied by the operation of the VOBC program, and sending a downloading request to the storage unit, wherein the downloading request comprises: the information of the line identification of the configuration file and the byte number to be downloaded;
after receiving the response information of the downloading request returned by the storage unit, downloading partial data of the configuration file in each operation period, wherein the byte number of the partial data is less than or equal to the byte number of the pre-downloading in each operation period.
9. An in-vehicle apparatus, characterized by comprising: the apparatus for hot loading VOBC configuration file in a train over-the-wire of claim 8.
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| CN109572753B (en) * | 2018-12-13 | 2021-03-12 | 交控科技股份有限公司 | Cross-line train VOBC configuration file processing method suitable for interconnection and interworking |
| CN115096291A (en) * | 2022-07-06 | 2022-09-23 | 上海电气集团智能交通科技有限公司 | Electronic map dynamic splicing method based on magnetic nail track |
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| "CBTC系统中数据存储单元（DSU）的数据安全研究";李凯;《中国优秀硕士学位论文全文数据库信息科技辑》;20100215(第2期);I140-386,第4章第1段，第4.2.1节 * |
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| CN106708569A (en) | 2017-05-24 |
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