CN110888387B - Contact net running state safety monitoring device and method - Google Patents
Contact net running state safety monitoring device and method Download PDFInfo
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Abstract
The utility model provides a contact net running state safety monitoring device and method, includes parallel message, parallel message transmission procedure and the capacity management and control procedure of information message, the structure of parallel message is constituteed through following field sequence: a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code; the parallel message transmitting program comprises a parallel message transmitting subprogram and a parallel message receiving subprogram; the capacity management and control program of the information message comprises a link detection subprogram of the Ethernet, a link triggering subprogram of the Ethernet and a capacity statistics subprogram of the information message; the defect that the capacity control matching mode of the information messages of the receiving end and the transmitting end is not functional when the receiving end receives an error message in the prior art is effectively avoided by combining other structures and methods.
Description
Technical Field
The application relates to the technical field of safety monitoring, also belongs to the technical field of overhead contact systems, and in particular relates to a safety monitoring device and method for the running state of an overhead contact system.
Background
The overhead contact system for electrified railway is a high-voltage power line which is erected along the upper part of a steel rail in a zigzag shape and is used for current collection of a pantograph. The overhead contact system is a main framework of railway electrification engineering, and is a special type power transmission line which is erected along the overhead of a railway line and supplies power to an electric locomotive. The device consists of a contact suspension, a supporting device, a positioning device, a support and a foundation.
And the electric power transmission line and the electrified railway contact net inevitably have cross-over. At the crossing point, the distance between the power transmission line and the electrified railway contact network must meet the electrical distance required by the national standard. In order to realize the real-time on-line monitoring of the electrical distance between the power transmission line and the electrified railway contact network, there is an on-line safety monitoring method of the electrical distance, which comprises the following steps:
analyzing the image transmitted from the image acquisition device through the image analysis device to obtain a monitoring distance between the electric power transmission line and the electrified railway contact network, and transmitting the monitoring distance to a remote dispatching center monitoring device; the dispatching center monitoring device judges whether the monitoring distance accords with the preset crossing point electrical distance, and when the monitoring distance does not accord with the preset crossing point electrical distance, the dispatching center monitoring device outputs early warning prompt information and returns the early warning prompt information to the image analysis device.
In practical application, the image acquisition device generally adopts a camera, the image analysis device generally adopts a PLC and an upper computer, the PLC is connected with the camera, the upper computer is connected with the PLC, the remote dispatching center monitoring device generally adopts a computer, the camera is connected with the PLC, the upper computer is connected with the remote dispatching center monitoring device through an Ethernet, thus, the dispatching center monitoring device returns early warning prompt information to the image analysis device and the image analysis device sends the monitoring distance information to the remote dispatching center monitoring device, the early warning prompt information is respectively returned to the image analysis device through the Ethernet and the monitoring distance information is sent to the remote dispatching center monitoring device through the Ethernet, so that information interaction between a receiving end and a transmitting end is achieved, when the dispatching center monitoring device returns the early warning prompt information to the image analysis device, the dispatching center monitoring device is the receiving end, the image analysis device returns the early warning prompt information to the image analysis device, and the image analysis device sends the monitoring distance information to the remote dispatching center monitoring device as the receiving end or the image analysis device, and the image analysis device sends the early warning prompt information to the dispatching center monitoring device is the receiving end; however, even though the communication protocol of the ethernet has the advantages of improving the transmission efficiency, reducing the delay and reducing the packet drop, the defect is also involved, and the capacity control of the information message received and transmitted on the link of the ethernet is used for ensuring that the information of the receiving end and the transmitting end can be sent in real time and treated in real time, when the receiving end cannot be treated in real time, the transmitting end terminates the transmission, when the receiving end has resource treatment, the transmitting end transmits in real time, and is a type of matching mode of the receiving end and the transmitting end; however, the capacity control mode of the information message under the current communication protocol of the ethernet has a defect that when the receiving end receives an error message, the error message is generated due to error correction code, or is generated due to interference during transmission, the transmitting end cannot obtain response information, or the receiving end and the transmitting end cannot know the condition of the link when the link of the ethernet is changed into a non-triggered state due to failure, and under such condition, the capacity control matching mode of the information message of the receiving end and the transmitting end is not functional; therefore, there is a need for a capacity management and control method under the information interaction between a receiving end and a transmitting end, and the capacity management and control method is applied to the receiving end and the transmitting end of the information transmission on the link of the ethernet, which is an improvement of the capacity management and control defect of the information message generated during the current ethernet information transmission period, and can improve the performance of the link information transmission of the ethernet.
Disclosure of Invention
In order to solve the problems, the application provides a safety monitoring device and a safety monitoring method for the operation state of a contact network, which effectively avoid the defect that the capacity control matching mode of information messages of a receiving end and a transmitting end is not functional when the receiving end receives an error message in the prior art.
In order to overcome the defects in the prior art, the application provides a solution for a contact net operation state safety monitoring device and method, which specifically comprises the following steps:
the utility model provides a contact net running state safety monitoring device, includes image acquisition device, image analysis device and remote dispatch center monitoring device, image acquisition device is the camera, image analysis device includes PLC and host computer, PLC is connected with the camera, the host computer with PLC connects, remote dispatch center monitoring device is the computer, the host computer with remote dispatch center monitoring device passes through the ethernet and is connected.
The dispatch center monitoring device returns the early warning prompt information to the image analysis device and the dispatch center monitoring device which sends the monitoring distance information to the far-end via the Ethernet respectively, so that the information interaction between the receiving end and the transmitting end is achieved.
When the dispatch center monitoring device returns the early warning prompt information to the image analysis device, the dispatch center monitoring device is a transmitting end, the image analysis device is a receiving end, and when the image analysis device sends the monitoring distance information to the dispatch center monitoring device at a far end, the dispatch center monitoring device is a receiving end, the image analysis device is a transmitting end, and the monitoring distance information or the early warning prompt information is information which is transmitted in an information message mode.
The contact net running state safety monitoring device also comprises a parallel message, a parallel message transmission program and a capacity control program of an information message, wherein the structure of the parallel message is composed of the following field sequences:
a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code;
the parallel message transmitting program comprises a parallel message transmitting subprogram and a parallel message receiving subprogram;
the capacity management and control program of the information message comprises a link detection subprogram of the Ethernet, a link triggering subprogram of the Ethernet and a capacity statistics subprogram of the information message;
the parallel message transmitting subprogram is used for setting and transmitting parallel messages, the parallel message receiving subprogram is used for receiving and decoding the parallel messages, and the parallel messages are transmitted and received separately;
the link detection subroutine of the Ethernet is used for monitoring whether the information message is transmitted on the link of the Ethernet, the link triggering subroutine of the Ethernet is used for transmitting a triggering command to the link of the Ethernet, and the capacity statistics subroutine of the information message is used for setting, calculating or recovering the default state of the capacity of the information message.
The method for the contact net operation state safety monitoring device comprises the steps of transmitting a monitoring distance to a remote dispatching center monitoring device through the image analysis device;
the dispatching center monitoring device judges whether the monitoring distance accords with the preset crossing point electric distance, and when the monitoring distance does not accord with the preset crossing point electric distance, early warning prompt information is output and returned to the image analysis device, so that information interaction between the receiving end and the transmitting end is achieved.
The information interaction method of the receiving end and the transmitting end comprises the following steps:
step 1: a parallel message is firstly arranged at a transmitting end and used as an intermediate message for capacity control of information messages of a receiving end and the transmitting end, and the structure of the parallel message is composed of the following field sequences:
a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code;
step 2: default state settings for links of ethernet: the parallel message transmitting subroutine of the transmitting end transmits the parallel message to the receiving end, at this time, the IP address of the transmitting end and the IP address of the receiving end in the parallel message are the actual IP address of the transmitting end and the IP address of the receiving end respectively, and the parallel code in the parallel message, the statistics field of the capacity of the information message and the value of the capacity control field of the information message are set to NULL; the capacity statistics subroutine of the information message defines a variable value K to represent the number of the information messages permitted to be transmitted by the transmitting end, defines a variable value L to count the number of the information messages transmitted by the transmitting end, and defines a duration statistics module S to count the receiving time of the parallel messages;
step 3: the parallel message receiving subprogram of the receiving end receives the parallel message and stores the IP address of the receiving end, and at the moment, the IP addresses of the receiving end and the transmitting end are stored, so that the default state setting of the link of the Ethernet is achieved;
step 4: when the link monitoring subprogram of the Ethernet at the transmitting end monitors that an information message is transmitted on the link of the Ethernet, the capacity statistics subprogram of the information message increases a variable value L to execute time statistics with the running time statistics module S, the parallel message transmission subprogram transmits parallel messages to the receiving end, at the moment, the parallel code in the parallel messages is increased by one for the value of the parallel code of the latest received parallel message, the value of a statistics field of the capacity of the information message is the variable value L, and the capacity management field of the information message is NULL;
step 5: decoding a parallel message when the parallel message receiving subprogram of the receiving end receives the parallel message;
step 6: when the variable value L in the capacity statistics subroutine of the information message is not smaller than the variable value K, it is indicated that the receiving performance of the receiving end on the information is lower than that of the transmitting end, and the highest receiving performance of the receiving end is reached, so that the transmitting end has to terminate transmitting the information message.
The method for decoding the parallel message comprises the following steps:
step 5-1: when the parallel code in the received parallel message is higher than the parallel code in the latest transmitted parallel message by one, the capacity statistics subroutine of the information message clears and restores the duration statistics module S, and the process goes to the step 5-2, otherwise, the received parallel message is abandoned, and the parallel message is waited;
step 5-2: when the value of a statistical field of the capacity of the information message in the received parallel message is not larger than a variable value L, the capacity statistical subroutine management and control duration statistical module S of the information message is cleared and restored, and the process goes to the step 5-3, otherwise, the received parallel message is abandoned, and the parallel message is waited;
step 5-3: when the value of the capacity control field of the information message in the received parallel message is NULL, representing that the receiving end receives an error-free information message, subtracting a sum duration statistics module S from a capacity statistics subroutine control variable value L of the information message for zero clearing and restoring; when the value of the capacity control field of the information message in the received parallel message is one, representing that the receiving end receives an error information message, the capacity statistics subroutine of the information message allows a variable value L to be subtracted by a sum duration statistics module S for zero clearing and restoration; when the time length statistics module S is the maximum timing value, the link representing the Ethernet is in a non-triggering state, at the moment, the link triggering subprogram of the Ethernet transmits a triggering command to the link of the Ethernet, and the capacity statistics subprogram of the information message clears and restores the variable value L and the time length statistics module S.
The beneficial effects of the application are as follows:
the application faces the defect that the capacity control mechanism of the information message under the communication protocol of the Ethernet at present is accompanied by that the receiving end receives an error message, the error message is in error due to error correction codes or is in error due to interference during transmission, the transmitting end cannot obtain response information, or the receiving end and the transmitting end cannot know the condition of the link when the triggered state is converted into the non-triggered state due to faults, under the condition, the capacity control matching mode of the information message of the receiving end and the transmitting end is not known, the improved method of the information interaction of the receiving end and the transmitting end can realize the condition of the transmitting end, the receiving end and the link, and the control and recovery of the capacity of the information message under different conditions are realized, thereby killing the performance of the link information transmission of the Ethernet. The method is applied to a transmitting end and a receiving end of information transmission on a link of the Ethernet, and comprises two aspects of transmission and reception for any one end, and the method conforms to the communication protocol of the current Ethernet transmission and has good universality.
Drawings
Fig. 1 is a structural diagram of a contact net operation state safety monitoring device of the present application.
Fig. 2 is a flow chart of a method of the contact net operation state safety monitoring device of the present application.
Detailed description of the preferred embodiments
The application will be further described with reference to the drawings and examples.
Example 1:
even though the communication protocol of the Ethernet has the advantages of improving the transmission efficiency, reducing the delay and reducing the packet drop number, the communication protocol is also accompanied by the defect that the capacity control of the information messages received and transmitted on the link of the Ethernet is used for ensuring that the information of the receiving end and the transmitting end can be transmitted in real time and treated in real time, the transmitting end stops transmitting when the receiving end cannot treat in real time, and the transmitting end transmits in real time when the receiving end has resource treatment, so that the communication protocol is a type of matching mode of the receiving end and the transmitting end; however, the capacity control mode of the information message under the current communication protocol of the ethernet has a defect that when the receiving end receives an error message, the error message is generated due to error correction code, or is generated due to interference during transmission, the transmitting end cannot obtain response information, or the receiving end and the transmitting end cannot know the condition of the link when the link of the ethernet is changed into a non-triggered state due to failure, and under such condition, the capacity control matching mode of the information message of the receiving end and the transmitting end is not functional; therefore, there is a need for a capacity management and control method under the information interaction between a receiving end and a transmitting end, where the capacity management and control method is applied to the receiving end and the transmitting end of information transmission on a link of an ethernet, is an improvement on the capacity management and control defect of an information message generated during the current ethernet information transmission, and can improve the performance of the link information transmission of the ethernet, so, as shown in fig. 1, through improvement, a contact network operation state safety monitoring device includes an image acquisition device, an image analysis device and a remote dispatching center monitoring device, where the image acquisition device is a camera, the image analysis device includes a PLC and an upper computer, the PLC is connected with the camera, the upper computer is connected with the PLC, and the remote dispatching center monitoring device is connected with the remote dispatching center monitoring device through the ethernet.
The dispatch center monitoring device returns the early warning prompt information to the image analysis device and the dispatch center monitoring device which sends the monitoring distance information to the far-end via the Ethernet respectively, so that the information interaction between the receiving end and the transmitting end is achieved.
When the dispatch center monitoring device returns the early warning prompt information to the image analysis device, the dispatch center monitoring device is a transmitting end, the image analysis device is a receiving end, and when the image analysis device sends the monitoring distance information to the dispatch center monitoring device at a far end, the dispatch center monitoring device is a receiving end, the image analysis device is a transmitting end, and the monitoring distance information or the early warning prompt information is information which is transmitted in an information message mode.
The contact net running state safety monitoring device also comprises a parallel message, a parallel message transmission program and a capacity control program of an information message, wherein the structure of the parallel message is composed of the following field sequences:
a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code;
the parallel message transmitting program comprises a parallel message transmitting subprogram and a parallel message receiving subprogram;
the capacity management and control program of the information message comprises a link detection subprogram of the Ethernet, a link triggering subprogram of the Ethernet and a capacity statistics subprogram of the information message;
the parallel message transmitting subprogram is used for setting and transmitting parallel messages, the parallel message receiving subprogram is used for receiving and decoding the parallel messages, and the parallel messages are transmitted and received separately;
the link detection subroutine of the Ethernet is used for monitoring whether the information message is transmitted on the link of the Ethernet, the link triggering subroutine of the Ethernet is used for transmitting a triggering command to the link of the Ethernet, and the capacity statistics subroutine of the information message is used for setting, calculating or recovering the default state of the capacity of the information message.
Example 2:
even though the communication protocol of the Ethernet has the advantages of improving the transmission efficiency, reducing the delay and reducing the packet drop number, the communication protocol is also accompanied by the defect that the capacity control of the information messages received and transmitted on the link of the Ethernet is used for ensuring that the information of the receiving end and the transmitting end can be transmitted in real time and treated in real time, the transmitting end stops transmitting when the receiving end cannot treat in real time, and the transmitting end transmits in real time when the receiving end has resource treatment, so that the communication protocol is a type of matching mode of the receiving end and the transmitting end; however, the capacity control mode of the information message under the current communication protocol of the ethernet has a defect that when the receiving end receives an error message, the error message is generated due to error correction code, or is generated due to interference during transmission, the transmitting end cannot obtain response information, or the receiving end and the transmitting end cannot know the condition of the link when the link of the ethernet is changed into a non-triggered state due to failure, and under such condition, the capacity control matching mode of the information message of the receiving end and the transmitting end is not functional; therefore, there is a need for a capacity management and control method under the information interaction between a receiving end and a transmitting end, where the capacity management and control method is applied to the receiving end and the transmitting end of information transmission on a link of an ethernet, is an improvement on the capacity management and control defect of an information message generated during the current ethernet information transmission, and can improve the performance of the link information transmission of the ethernet, so that, by improving, as shown in fig. 1-2, a contact network operation state safety monitoring device includes an image acquisition device, an image analysis device and a remote dispatching center monitoring device, where the image acquisition device is a camera, the image analysis device includes a PLC and an upper computer, the PLC is connected with the camera, the upper computer is connected with the PLC, and the remote dispatching center monitoring device is connected with the remote dispatching center monitoring device through the ethernet.
The dispatch center monitoring device returns the early warning prompt information to the image analysis device and the dispatch center monitoring device which sends the monitoring distance information to the far-end via the Ethernet respectively, so that the information interaction between the receiving end and the transmitting end is achieved.
When the dispatch center monitoring device returns the early warning prompt information to the image analysis device, the dispatch center monitoring device is a transmitting end, the image analysis device is a receiving end, and when the image analysis device sends the monitoring distance information to the dispatch center monitoring device at a far end, the dispatch center monitoring device is a receiving end, the image analysis device is a transmitting end, and the monitoring distance information or the early warning prompt information is information which is transmitted in an information message mode.
The contact net running state safety monitoring device also comprises a parallel message, a parallel message transmission program and a capacity control program of an information message, wherein the structure of the parallel message is composed of the following field sequences:
a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code;
the parallel message transmitting program comprises a parallel message transmitting subprogram and a parallel message receiving subprogram;
the capacity management and control program of the information message comprises a link detection subprogram of the Ethernet, a link triggering subprogram of the Ethernet and a capacity statistics subprogram of the information message;
the parallel message transmitting subprogram is used for setting and transmitting parallel messages, the parallel message receiving subprogram is used for receiving and decoding the parallel messages, and the parallel messages are transmitted and received separately;
the link detection subroutine of the Ethernet is used for monitoring whether the information message is transmitted on the link of the Ethernet, the link triggering subroutine of the Ethernet is used for transmitting a triggering command to the link of the Ethernet, and the capacity statistics subroutine of the information message is used for setting, calculating or recovering the default state of the capacity of the information message.
The method for the safety monitoring device of the operation state of the overhead line system comprises the steps of shooting images of crossing points of an electric power transmission line and an electrified railway overhead line system through a preset image acquisition device, and transmitting the images to a corresponding image analysis device;
analyzing the image through the image analysis device to obtain a monitoring distance between the electric power transmission line at the crossing point and the electrified railway contact net, and transmitting the monitoring distance to a remote dispatching center monitoring device;
the dispatching center monitoring device judges whether the monitoring distance accords with the preset crossing point electric distance, and when the monitoring distance does not accord with the preset crossing point electric distance, early warning prompt information is output and returned to the image analysis device, so that information interaction between the receiving end and the transmitting end is achieved.
The method for information interaction between the receiving end and the transmitting end is applied to the transmitting end and the receiving end of information transmission on the link of the Ethernet, and is faced with the defect that the capacity control mechanism of the information messages under the current communication protocol of the Ethernet is accompanied by that the receiving end receives an error message, the error message is error-corrected or is error-corrected due to interference during transmission, the transmitting end cannot obtain response information, or the receiving end and the transmitting end cannot know the condition of the link when the link of the Ethernet is changed into a non-triggering state due to failure, under the condition that the capacity control matching mode of the information messages of the receiving end and the transmitting end is lost, the improved method for information interaction between the receiving end and the transmitting end can realize the mutual condition understanding of the transmitting end, the receiving end and the link, and realize the control and restoration of the capacity of the information messages under different conditions, thereby killing the performance of the link information transmission of the Ethernet.
The information interaction method of the receiving end and the transmitting end comprises the following steps:
step 1: a parallel message is firstly arranged at a transmitting end and used as an intermediate message for capacity control of information messages of a receiving end and the transmitting end, and the structure of the parallel message is composed of the following field sequences:
a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code; the parallel message structure satisfies the message structure of the communication protocol of the Ethernet, and sets the IP address of the transmitting end, the IP address of the receiving end, the parallel code, the statistical field of the capacity of the information message and the capacity control field of the information message to achieve the state transmission of capacity control of the information messages of the receiving end and the transmitting end;
step 2: default state settings for links of ethernet: the parallel message transmitting subroutine of the transmitting end transmits the parallel message to the receiving end, at this time, the IP address of the transmitting end and the IP address of the receiving end in the parallel message are the actual IP address of the transmitting end and the IP address of the receiving end respectively, and the parallel code in the parallel message, the statistics field of the capacity of the information message and the value of the capacity control field of the information message are set to NULL; the capacity statistics subroutine of the information message defines a variable value K to represent the number of the information messages permitted to be transmitted by the transmitting end, defines a variable value L to count the number of the information messages transmitted by the transmitting end, and defines a duration statistics module S to count the receiving time of the parallel messages;
step 3: the parallel message receiving subprogram of the receiving end receives the parallel message and stores the IP address of the receiving end, and at the moment, the IP addresses of the receiving end and the transmitting end are stored, so that the default state setting of the link of the Ethernet is achieved;
step 4: when the link monitoring subprogram of the Ethernet at the transmitting end monitors that an information message is transmitted on the link of the Ethernet, the capacity statistics subprogram of the information message increases a variable value L to execute time statistics with the running time statistics module S, the parallel message transmission subprogram transmits parallel messages to the receiving end, at the moment, the parallel code in the parallel messages is increased by one for the value of the parallel code of the latest received parallel message, the value of a statistics field of the capacity of the information message is the variable value L, and the capacity management field of the information message is NULL;
step 5: decoding a parallel message when the parallel message receiving subprogram of the receiving end receives the parallel message;
step 6: when the variable value L in the capacity statistics subroutine of the information message is not smaller than the variable value K, it is indicated that the receiving performance of the receiving end on the information is lower than that of the transmitting end, and the highest receiving performance of the receiving end is reached, so that the transmitting end has to terminate transmitting the information message.
The method for decoding the parallel message comprises the following steps:
step 5-1: when the parallel code in the received parallel message is higher than the parallel code in the latest transmitted parallel message by one, the capacity statistics subroutine of the information message clears and restores the duration statistics module S, and the process goes to the step 5-2, otherwise, the received parallel message is abandoned, and the parallel message is waited;
step 5-2: when the value of a statistical field of the capacity of the information message in the received parallel message is not larger than a variable value L, the capacity statistical subroutine management and control duration statistical module S of the information message is cleared and restored, and the process goes to the step 5-3, otherwise, the received parallel message is abandoned, and the parallel message is waited;
step 5-3: when the value of the capacity control field of the information message in the received parallel message is NULL, representing that the receiving end receives an error-free information message, subtracting a sum duration statistics module S from a capacity statistics subroutine control variable value L of the information message for zero clearing and restoring; when the value of the capacity control field of the information message in the received parallel message is one, the receiving end receives an error information message, namely the receiving end receives an error information message, however, the receiving end also achieves an information message transmission operation for the transmitting end, so that the capacity statistics subroutine of the information message subtracts a variable value L from a duration statistics module S for zero clearing and restoring; when the time length statistics module S is the maximum timing value, the link representing the Ethernet is in a non-triggering state, at the moment, the link triggering subprogram of the Ethernet transmits a triggering command to the link of the Ethernet, and the capacity statistics subprogram of the information message clears and restores the variable value L and the time length statistics module S.
In summary, the method for information interaction between the receiving end and the transmitting end of the present application includes introducing parallel message transmission program and capacity control program of the message, and the method for information interaction between the receiving end and the transmitting end is applied to the receiving end and the transmitting end of the message transmission on the link of the ethernet, which is an improvement of the capacity control defect of the message occurring during the current ethernet message transmission, and can improve the performance of the link message transmission of the ethernet.
While the application has been described above with reference to the process illustrated by the embodiments, it will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, and that each change, modification and substitution may be made without departing from the scope of the application.
Claims (5)
1. The safety monitoring device for the operation state of the overhead line system is characterized by comprising an image acquisition device, an image analysis device and a remote dispatching center monitoring device, wherein the image acquisition device is a camera, the image analysis device comprises a PLC and an upper computer, the PLC is connected with the camera, the upper computer is connected with the PLC, the remote dispatching center monitoring device is a computer, and the upper computer is connected with the remote dispatching center monitoring device through an Ethernet; the dispatch center monitoring device returns the early warning prompt information to the image analysis device and the dispatch center monitoring device which sends the monitoring distance information to the far-end via the Ethernet respectively, so that the information interaction between the receiving end and the transmitting end is achieved;
the information interaction method of the receiving end and the transmitting end comprises the following steps:
step 1: a parallel message is firstly arranged at a transmitting end and used as an intermediate message for capacity control of information messages of a receiving end and the transmitting end, and the structure of the parallel message is composed of the following field sequences:
a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code;
step 2: default state settings for links of ethernet: the parallel message transmitting subroutine of the transmitting end transmits the parallel message to the receiving end, at this time, the IP address of the transmitting end and the IP address of the receiving end in the parallel message are the actual IP address of the transmitting end and the IP address of the receiving end respectively, and the parallel code in the parallel message, the statistics field of the capacity of the information message and the value of the capacity control field of the information message are set to NULL; the capacity statistics subroutine of the information message defines a variable value K to represent the number of the information messages permitted to be transmitted by the transmitting end, defines a variable value L to count the number of the information messages transmitted by the transmitting end, and defines a duration statistics module S to count the receiving time of the parallel messages;
step 3: the parallel message receiving subprogram of the receiving end receives the parallel message and stores the IP address of the receiving end, and at the moment, the IP addresses of the receiving end and the transmitting end are stored, so that the default state setting of the link of the Ethernet is achieved;
step 4: when the link monitoring subprogram of the Ethernet at the transmitting end monitors that an information message is transmitted on the link of the Ethernet, the capacity statistics subprogram of the information message increases a variable value L to execute time statistics with the running time statistics module S, the parallel message transmission subprogram transmits parallel messages to the receiving end, at the moment, the parallel code in the parallel messages is increased by one for the value of the parallel code of the latest received parallel message, the value of a statistics field of the capacity of the information message is the variable value L, and the capacity management field of the information message is NULL;
step 5: decoding a parallel message when the parallel message receiving subprogram of the receiving end receives the parallel message;
step 6: when the variable value L in the capacity statistics subroutine of the information message is not smaller than the variable value K, it is indicated that the receiving performance of the receiving end on the information is lower than that of the transmitting end, and the highest receiving performance of the receiving end is reached, so that the transmitting end has to terminate transmitting the information message.
2. The contact net operation state safety monitoring device according to claim 1, wherein when the dispatching center monitoring device returns the early warning prompt information to the image analysis device, the dispatching center monitoring device is a transmitting end, the image analysis device is a receiving end, when the image analysis device sends the monitoring distance information to the remote dispatching center monitoring device, the dispatching center monitoring device is a receiving end, the image analysis device is a transmitting end, the monitoring distance information or the early warning prompt information is information, and the information is transmitted in an information message mode.
3. The overhead line system operation state safety monitoring device according to claim 1, further comprising a parallel message, a parallel message transmission program and a capacity control program of an information message, wherein the structure of the parallel message is composed of the following field sequences:
a message header identification code, a message header, an IP address of a transmitting end, an IP address of a receiving end, a parallel code, a field for counting the capacity of an information message, a field for controlling the capacity of the information message, an error correction code and a message tail identification code;
the parallel message transmitting program comprises a parallel message transmitting subprogram and a parallel message receiving subprogram;
the capacity management and control program of the information message comprises a link detection subprogram of the Ethernet, a link triggering subprogram of the Ethernet and a capacity statistics subprogram of the information message;
the parallel message transmitting subprogram is used for setting and transmitting parallel messages, the parallel message receiving subprogram is used for receiving and decoding the parallel messages, and the parallel messages are transmitted and received separately;
the link detection subroutine of the Ethernet is used for monitoring whether the information message is transmitted on the link of the Ethernet, the link triggering subroutine of the Ethernet is used for transmitting a triggering command to the link of the Ethernet, and the capacity statistics subroutine of the information message is used for setting, calculating or recovering the default state of the capacity of the information message.
4. The method of the safety monitoring device for the operation state of the overhead line system is characterized by comprising the step of transmitting the monitoring distance to a remote dispatching center monitoring device through an image analysis device; the dispatching center monitoring device judges whether the monitoring distance accords with the preset crossing point electric distance, and when the monitoring distance does not accord with the preset crossing point electric distance, early warning prompt information is output and returned to the image analysis device, so that information interaction between the receiving end and the transmitting end is achieved.
5. The method of claim 4, wherein the method of decoding the parallel message comprises the steps of:
step 5-1: when the parallel code in the received parallel message is higher than the parallel code in the latest transmitted parallel message by one, the capacity statistics subroutine of the information message clears and restores the duration statistics module S, and the process goes to the step 5-2, otherwise, the received parallel message is abandoned, and the parallel message is waited;
step 5-2: when the value of a field for counting the capacity of the information message in the received parallel message is not larger than a variable value L, the capacity counting subroutine control duration counting module S of the information message is cleared and restored, and the process goes to the step 5-3, otherwise, the received parallel message is abandoned, and the parallel message is waited;
step 5-3: when the value of the capacity control field of the information message in the received parallel message is NULL, representing that the receiving end receives an error-free information message, subtracting a sum duration statistics module S from a capacity statistics subroutine control variable value L of the information message for zero clearing and restoring; when the value of the capacity control field of the information message in the received parallel message is one, representing that the receiving end receives an error information message, the capacity statistics subroutine of the information message allows a variable value L to be subtracted by a sum duration statistics module S for zero clearing and restoration; when the time length statistics module S is the maximum timing value, the link representing the Ethernet is in a non-triggering state, at the moment, the link triggering subprogram of the Ethernet transmits a triggering command to the link of the Ethernet, and the capacity statistics subprogram of the information message clears and restores the variable value L and the time length statistics module S.
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