CN111367695A - Railway signal equipment safety computer platform bears many application systems - Google Patents
Railway signal equipment safety computer platform bears many application systems Download PDFInfo
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- CN111367695A CN111367695A CN202010481718.2A CN202010481718A CN111367695A CN 111367695 A CN111367695 A CN 111367695A CN 202010481718 A CN202010481718 A CN 202010481718A CN 111367695 A CN111367695 A CN 111367695A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/547—Remote procedure calls [RPC]; Web services
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1004—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's to protect a block of data words, e.g. CRC or checksum
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/544—Buffers; Shared memory; Pipes
Abstract
The invention discloses a railway signal equipment safety computer platform bearing multi-application system, which comprises a platform software module and a plurality of application software modules, wherein the platform software module is connected with each application software module through a first interface; each application software module is provided with application software; the platform software module comprises a logic processing unit and a communication processing unit; the communication processing unit is communicated with an external communication network and sends external communication data of the external communication network to the logic processing unit; the logic processing unit is used for processing external communication data of an external communication network, processing output data of the application software and sending a processing result of the output data to the communication processing unit. The invention loads a plurality of application software through the safety computer platform and operates simultaneously, thereby improving the operation efficiency, reducing the hardware scale and reducing the cost.
Description
Technical Field
The invention belongs to the technical field of rail transit, and particularly relates to a railway signal equipment safety computer platform bearing multi-application system.
Background
A railway signal equipment safety computer platform (hereinafter referred to as a platform) is used as a safety guarantee core of a modern rail transit control system, a three-to-two or two-to-two redundant structure design is utilized, and through a fault-oriented safety design concept, an operating environment meeting safety integrity level requirements is provided for various application software, and the railway signal equipment safety computer platform is widely applied to vehicle-mounted and ground equipment. As shown in fig. 1, fig. 1 is a typical platform structure. The platform software comprises modules of logic processing, fault processing, communication processing and the like, and can process received external communication data, and a processing result is provided for the Application software through an Application Programming Interface (API); and output data of the application software can be acquired through the API and sent to an external communication network after being processed. The platform software adopts a periodic operation mode, and the application software is called once every period.
At present, each platform can only bear one application software, so that a set of platform needs to be developed for each application software, the cost and the maintenance difficulty are increased, and the formation of a unified product standard is not facilitated.
Therefore, a railway signaling equipment security computer platform capable of carrying multiple application software is needed.
Disclosure of Invention
In view of the above problems, the present invention provides a railway signaling equipment safety computer platform carrying multi-application system, which comprises a platform software module and a plurality of application software modules, wherein,
the platform software module is connected with each application software module through a first interface;
each application software module is provided with application software;
the platform software module comprises a logic processing unit and a communication processing unit;
the communication processing unit is communicated with an external communication network and sends external communication data of the external communication network to the logic processing unit;
the logic processing unit is used for processing external communication data of an external communication network, processing output data of the application software and sending a processing result of the output data to the communication processing unit.
Further, the platform software module further comprises a fault handling unit;
and the fault processing unit is used for carrying out corresponding fault processing according to the fault grade of the application software.
Further, the platform software module can identify the number of the application software and execute the operation steps according to the number of the application software, including:
if the number of the application software is one, the platform software module fixedly numbers the application software to be 0;
and if the number of the application software is multiple, the platform software module carries out numbering processing on the application software.
Further, the numbering process of the application software by the platform software module comprises:
the platform software module acquires the name of each application software and checks whether the name of the application software is legal or not;
if the names of the application software are legal, checking whether the names of the application software have duplicate names;
and if the name of the application software has no duplicate name, assigning a unique index number to each application software.
Further, the application software is circularly operated in turn according to the sequence of index numbers from low to high.
Further, at most one of said applications is running at a time.
Further, the platform software module further comprises a data cache region;
and the application software reads and writes part or all of the data in the data cache region through the second interface.
Further, the application software can check the data in the data cache region, including:
checking whether the data in the data buffer area is expired: adding a time stamp to the data, and comparing the time stamps when the data is read and the time stamps when the data is written;
checking whether the data in the data buffer is accidentally tampered: adding a CRC (cyclic redundancy check) code to the data, and verifying through the CRC code;
checking whether the data in the data cache region has an application software mark: adding an application software mark to the data, wherein the application software mark comprises the name of the application software and the index number of the application software, and acquiring the source application software to which the data is written and the read target application software through the application software mark.
Further, if the check result of the data in the data cache region is one or more of expiration, accidental tampering or absence of the application software mark, the application software judges that the system has a fault, determines the fault level, and sends the fault level information to the fault processing unit through the first interface.
Further, the fault classes include:
mild level faults, medium level faults, severe level faults, and most severe level faults.
Further, the fault processing unit is configured to perform corresponding fault processing according to a fault level of the application software, and specifically includes: the fault processing unit takes the highest fault grade in the fault grades as the standard to carry out corresponding fault processing, wherein,
when the slight level fails, the safety computer platform only alarms and has no other treatment;
when the medium-level fault occurs, the safety computer platform gives an alarm and is set to be in a standby state, and in the standby state, the safety computer platform does not output data to the outside;
when the serious level fails, the safety computer platform gives an alarm and stops, and if a watchdog is configured, the safety computer platform is allowed to automatically restart; if the watchdog is not configured, the safety computer platform is not allowed to be automatically restarted, and only can be manually restarted;
when the most serious level of faults occur, the safety computer platform gives an alarm and goes down, and the safety computer platform is not allowed to be automatically restarted and only can be manually restarted no matter whether a watchdog is configured or not.
Further, the platform software module can judge the validity of the memory occupied by the application software, if the memory occupied by the application software does not satisfy a first specified condition, the memory occupied by the application software is illegal, and the platform of the security computer fails, where the first specified condition includes:
the code segment start address of the same application software is lower than the code segment end address, and the data segment start address is lower than the data segment end address;
the code segment end address of the same application software is lower than the data segment start address;
the data segment end address of the application software is lower than the code segment start address of the next application software;
and all the memory occupied by the application software is within the memory range set by the safety computer platform.
Further, the platform software module can judge the validity of the running time of the application software, and if the running time of the application software does not satisfy a second specified condition, the running time of the application software is illegal, and the platform of the security computer fails, where the second specified condition includes:
the running time of each application software does not exceed the set allowable running time;
the accumulated running time of all the application software does not exceed the set allowable running time.
The invention has the advantages that the safety computer platform bears various application software to run simultaneously, the complexity of communication and adaptation among the application software is simplified, the application software directly carries out data communication through the data cache region, the running efficiency is improved, the hardware scale is reduced, the cost is reduced, the complexity of the safety computer platform is greatly reduced, and the maintenance pressure of workers is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a block diagram of a prior art railway signaling equipment secure computer platform system;
fig. 2 shows a block diagram of a railway signaling equipment security computer platform carrying a multi-application system 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 and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a railway signal equipment safety computer platform bearing multi-application system, exemplarily, fig. 2 shows a structure diagram of the railway signal equipment safety computer platform bearing multi-application system according to the embodiment of the invention, as shown in fig. 2, the system comprises a platform software module, a plurality of application software modules, an operating system module, an equipment driving module and a hardware module, each application software module is provided with application software, the platform software module is connected with the application software module through a first interface, namely the platform software module performs data interaction with the application software in the application software module through the first interface, and a unified interface is adopted between the platform software module and each application software module. For example, in the prior art, the application software a interacts with the platform software module through the interface a, and the application software B interacts with the platform software module through the interface B, in this embodiment, the application software a and the application software B both interact with the platform software module through the interface C, and for the application software a and the application software B, the interface C is consistent in form, but different parameters can be written into the application software a and the application software B, and the platform software module recognizes the parameters, so that it can be distinguished whether the application software a is called or the application software B is called. The first Interface is an API (Application Programming Interface). The platform software module comprises a logic processing unit, a communication processing unit and a fault processing unit. The communication processing unit communicates with an external communication network, and sends external communication data of the external communication network to the logic processing unit, specifically: the communication processing unit is connected with the operating system module through the API interface, further realizes data interaction with an external communication network through the equipment driving module and the hardware module, acquires external communication data from the external communication network, and sends the external communication data to the logic processing unit. The logic processing unit is used for processing external communication data of an external communication network, processing output data of the application software, and sending a processing result of the output data to the communication processing unit, and further the communication processing unit sends the processing result to the external communication network through an API (application programming interface). The fault processing unit may receive fault level information sent by other units or modules, and perform corresponding fault processing according to the fault level of the application software, where the fault level includes: mild level faults, medium level faults, severe level faults, and most severe level faults.
When the secure computer platform in this embodiment starts to work, the platform software module may first identify the number of the application software, and may execute different operations according to the number of the application software, specifically:
when the number of the identified application software is one, the platform software module fixedly numbers the application software to be 0;
and when the number of the identified application software is more than one, the platform software module carries out numbering processing on the application software.
The platform software module performs numbering processing on the application software according to the following steps:
the platform software module firstly acquires the name of each application software and checks whether the name of the application software is legal or not;
if the names of the application software are legal, continuously checking whether the names of the application software have duplicate names;
and if the name of the application software has no duplicate name, assigning a unique index number to each application software.
The index numbers are arranged from low to high in sequence, the application software runs according to the index number sequence, only one application software runs at most at each moment, and the next application software starts to run after the current application software runs. And when all the application software runs once, the running is a period, then the running is started again from the first application software, and the next period is carried out for circulating running.
In order to meet the requirement of directly interacting data among a plurality of application software running on the same safety computer platform, a data cache region is arranged in a platform software module, and the application software reads and writes part or all data in the data cache region through a second interface, so that data interaction is realized. Specifically, the method comprises the following steps: the application software writes the data into the data cache region first, and the application software needing the data reads from the data cache region. The size and the boundary of the data cache region are limited by a safety computer platform, and application software cannot be modified. Each application software can read and write all the data in the data buffer area or only read and write part of the data in the data buffer area. If the application software tries to read and write data beyond the range of the data cache region through the second interface, the safety computer platform prevents the behavior and gives an alarm. And, the platform software module is not responsible for checking the following characteristics of the data in the data cache:
whether the data is expired;
whether the data is accidentally tampered by other application software;
the data is written by and can be read by the application software.
The characteristics of the data in the data cache region are checked by the application software, which includes the following specific steps:
checking whether the data in the data buffer area is expired: adding a time stamp to the data, and comparing the time stamps when the data is read and the time stamps when the data is written;
checking whether the data in the data buffer is accidentally tampered: adding a CRC (cyclic redundancy check) code to the data, and verifying through the CRC code;
checking whether the data in the data cache region has an application software mark: adding an application software mark to the data, wherein the application software mark comprises the name of the application software and the index number of the application software, and acquiring the source application software to which the data is written and the read target application software through the application software mark.
If the check result of the data in the data cache area is one or more of expiration, accidental tampering or no application software mark, the application software judges that the system has a fault, determines the fault level, and sends the fault level information to the fault processing unit through the first interface
After receiving the fault level information, the fault processing unit performs corresponding fault processing according to the fault level, specifically: the fault processing unit takes the highest fault grade in the fault grades as the standard to carry out corresponding fault processing, wherein,
when the slight level fails, the safety computer platform only alarms and has no other treatment;
when the medium-level fault occurs, the safety computer platform gives an alarm and is set to be in a standby state, and in the standby state, the safety computer platform does not output data to the outside;
when the serious level fails, the safety computer platform gives an alarm and stops, and if a watchdog is configured, the safety computer platform is allowed to automatically restart; if the watchdog is not configured, the safety computer platform is not allowed to be automatically restarted, and only can be manually restarted;
when the most serious level of faults occur, the safety computer platform gives an alarm and goes down, and the safety computer platform is not allowed to be automatically restarted and only can be manually restarted no matter whether a watchdog is configured or not.
The platform software module is responsible for detecting the legality of the memory occupied by the application software, the memory occupied by the application software is firstly obtained, the memory comprises a code segment starting address, a code segment ending address, a data segment starting address and a data segment ending address, and the memory detection rule comprises the following steps:
the code segment start address of the same application software is lower than the code segment end address, and the data segment start address is lower than the data segment end address;
the code segment end address of the same application software is lower than the data segment start address;
the data segment end address of the application software is lower than the code segment start address of the next application software;
the memory occupied by all the application software (i.e. from the code segment start address of the first application software to the data segment end address of the last application software) is within the memory range set by the secure computer platform.
If the memory occupied by the application software does not accord with the memory detection rule, the detection fails, the safety computer platform is down, and all the application software stops running.
The platform software module is also responsible for detecting the validity of the running time of the application software, and because scheduling, preemption and other conditions exist among tasks, if the execution process of the application software task is interrupted by a task with high priority, the obtained running time is not real, so that the embodiment firstly creates a task with higher priority than the application software task, and obtains the running time of each application software in the current period in real time, and the running time detection rule comprises the following steps:
the running time of each application software does not exceed the set allowable running time;
the accumulated running time of all the application software does not exceed the set allowable running time.
And if the running time of the application software does not accord with the running time detection rule, the running time detection of the application software fails, the safety computer platform is stopped, and all the application software (including the application software which is run in the current period, is running and is not running) stops running.
It should be noted that, the hardware of the secure computer platform in this embodiment does not need to be changed, and is compatible with a scheme of running only one application software and running multiple application software.
The invention loads a plurality of application software through the safety computer platform and operates simultaneously, simplifies the complexity of communication and adaptation among the application software, and improves the operation efficiency by directly carrying out data communication among the application software through the data cache region. Different types of equipment deployed at the same place are combined, so that the hardware scale is reduced, and the hardware cost is reduced. And the complexity of the safety computer platform is greatly reduced, only one safety computer platform needs to be maintained, the maintenance pressure of workers is reduced, a standard and uniform product chain is favorably formed, and the advantages in the aspects of interconnection and intercommunication and the like are improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A railway signaling equipment safety computer platform bearing multi-application system is characterized in that the system comprises a platform software module and a plurality of application software modules, wherein,
the platform software module is connected with each application software module through a first interface;
each application software module is provided with application software;
the platform software module comprises a logic processing unit and a communication processing unit;
the communication processing unit is communicated with an external communication network and sends external communication data of the external communication network to the logic processing unit;
the logic processing unit is used for processing external communication data of an external communication network, processing output data of the application software and sending a processing result of the output data to the communication processing unit.
2. The railway signaling device security computer platform-bearing multi-application system of claim 1, wherein the platform software module further comprises a fault handling unit;
and the fault processing unit is used for carrying out corresponding fault processing according to the fault grade of the application software.
3. The railway signaling device security computer platform bearing multi-application system of claim 1, wherein the platform software module is capable of identifying the number of application software and performing operational steps based on the number of application software, comprising:
if the number of the application software is one, the platform software module fixedly numbers the application software to be 0;
and if the number of the application software is multiple, the platform software module carries out numbering processing on the application software.
4. The railway signaling device security computer platform bearing multi-application system of claim 3, wherein the platform software module numbering application software comprises:
the platform software module acquires the name of each application software and checks whether the name of the application software is legal or not;
if the names of the application software are legal, checking whether the names of the application software have duplicate names;
and if the name of the application software has no duplicate name, assigning a unique index number to each application software.
5. The railway signaling equipment security computer platform-borne multi-application system of claim 4, wherein the application software is run cyclically in turn according to the sequence of index numbers from low to high.
6. The railway signaling device security computer platform bearing multi-application system of claim 4, wherein at most only one of the application software is running at a time.
7. The railway signaling device security computer platform-borne multi-application system of claim 2, wherein the platform software module further comprises a data cache;
and the application software reads and writes part or all of the data in the data cache region through the second interface.
8. The railway signaling device security computer platform bearing multi-application system of claim 7, wherein the application software is capable of inspecting data in the data buffer, comprising:
checking whether the data in the data buffer area is expired: adding a time stamp to the data, and comparing the time stamps when the data is read and the time stamps when the data is written;
checking whether the data in the data buffer is accidentally tampered: adding a CRC (cyclic redundancy check) code to the data, and verifying through the CRC code;
checking whether the data in the data cache region has an application software mark: adding an application software mark to the data, wherein the application software mark comprises the name of the application software and the index number of the application software, and acquiring the source application software to which the data is written and the read target application software through the application software mark.
9. The railway signaling equipment security computer platform bearing multi-application system of claim 8, wherein if the data in the data buffer is one or more of expired, accidentally tampered with, or absent of an application flag, the application determines that the system is faulty, determines a fault level, and sends fault level information to the fault processing unit through the first interface.
10. The railway signaling device security computer platform bearing multi-application system of claim 9, wherein the failure level comprises:
mild level faults, medium level faults, severe level faults, and most severe level faults.
11. The railway signaling device security computer platform bearer multi-application system of claim 10, wherein the fault handling unit is configured to perform corresponding fault handling according to a fault class of application software, and specifically: the fault processing unit takes the highest fault grade in the fault grades as the standard to carry out corresponding fault processing, wherein,
when the slight level fails, the safety computer platform only alarms and has no other treatment;
when the medium-level fault occurs, the safety computer platform gives an alarm and is set to be in a standby state, and in the standby state, the safety computer platform does not output data to the outside;
when the serious level fails, the safety computer platform gives an alarm and stops, and if a watchdog is configured, the safety computer platform is allowed to automatically restart; if the watchdog is not configured, the safety computer platform is not allowed to be automatically restarted, and only can be manually restarted;
when the most serious level of faults occur, the safety computer platform gives an alarm and goes down, and the safety computer platform is not allowed to be automatically restarted and only can be manually restarted no matter whether a watchdog is configured or not.
12. The railway signaling equipment security computer platform-borne multi-application system of any one of claims 1 to 11, wherein the platform software module is capable of determining the validity of the memory occupied by the application software, and if the memory occupied by the application software does not satisfy a first specified condition, the memory occupied by the application software is illegal, and the security computer platform fails, and the first specified condition includes:
the code segment start address of the same application software is lower than the code segment end address, and the data segment start address is lower than the data segment end address;
the code segment end address of the same application software is lower than the data segment start address;
the data segment end address of the application software is lower than the code segment start address of the next application software;
and all the memory occupied by the application software is within the memory range set by the safety computer platform.
13. The railway signaling device security computer platform-borne multi-application system of any one of claims 1 to 11, wherein the platform software module is capable of determining the validity of the runtime of the application software, and if the runtime of the application software does not satisfy a second specified condition, the runtime of the application software is illegal and the security computer platform fails, and the second specified condition comprises:
the running time of each application software does not exceed the set allowable running time;
the accumulated running time of all the application software does not exceed the set allowable running time.
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