CN107332588B - Outdoor on-line monitoring system for trackside equipment and communication error control method thereof - Google Patents
Outdoor on-line monitoring system for trackside equipment and communication error control method thereof Download PDFInfo
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
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Abstract
The invention discloses an outdoor on-line monitoring system for trackside equipment, which comprises: the data acquisition unit is used for acquiring frequency shift signal parameters of the track circuit, track circuit voltage, lighting loop parameters of the annunciator, actions of the turnout switch and notch characteristic parameters; the data transmission unit is used for transmitting the data acquired by the data acquisition unit to the PLC protocol converter through the LPLC channel; and the PLC protocol converter is used for carrying out protocol conversion, transmitting the converted data to the communication interface extension set and transmitting the converted data to the signal centralized monitoring station machine through the communication interface extension set, so that the communication fault range is narrowed, the reliability of the outdoor online monitoring system of the trackside equipment is improved, and the technical effect of the monitoring efficiency is improved.
Description
Technical Field
The invention relates to the technical field of rail transit research, in particular to an outdoor on-line monitoring system for trackside equipment and a communication error control method thereof.
Background
At present, the information acquisition of various devices by a domestic signal centralized monitoring system is only limited to an indoor local circuit, and no outdoor device information acquisition is available. And 90% of signal equipment faults occur outdoors, and when the faults occur, maintenance personnel can only manually measure and search fault points due to the fact that outdoor equipment monitoring means is not available, and the fault processing time is long. In particular, the fault processing time of the circuit of the section track is longer and often exceeds 2 hours to form a D21 accident, thereby seriously interfering the running organization.
In summary, in the process of implementing the technical solution of the present invention, the inventors of the present application find that the above-mentioned technology has at least the following technical problems:
in the prior art, the conventional outdoor monitoring method for the trackside equipment has the technical problems that error control can be implemented only statically according to a set configuration file, the efficiency is low, and the running organization is seriously interfered.
Disclosure of Invention
The invention provides an outdoor on-line monitoring system for trackside equipment and a communication error control method thereof, which solve the technical problems that the conventional outdoor monitoring method for trackside equipment can only statically implement error control according to a set configuration file, has low efficiency and seriously interferes with the driving organization, and realize the technical effects of reducing the communication fault range, improving the reliability of the outdoor on-line monitoring system for trackside equipment and improving the monitoring efficiency.
In order to improve the railway signal monitoring and detecting, comprehensive intelligent analysis and decision-making assisting capabilities, a set of trackside equipment outdoor online monitoring system is developed by applying trackside equipment outdoor online monitoring technology, and a detection and monitoring platform with a comprehensive processing function is formed by performing function perfection and technology integration on detection and monitoring equipment.
The narrow-band high-speed low-voltage power line carrier communication (LPLC) technology adopted by the outdoor on-line monitoring system of the trackside equipment takes a power line with the same path as a transmission medium, and combines with filtering equipment to convert low-frequency and low-voltage signals such as voice, data and the like to be transmitted into high-frequency signals capable of being transmitted on the power line, and the high-frequency signals are transmitted on the power line and restored at a receiving end. The LPLC has the advantages of low investment, short construction period, simple equipment, synchronization with power grid construction, consistency of coverage and a power system and the like, and the LPLC can be considered to be adopted under the conditions that the number of channels is small, the number of nodes needing communication coverage is large, or other communication modes are inconvenient.
The outdoor on-line monitoring system for the trackside equipment has the characteristics of scattered acquisition points, stable network load, short-frame data transmission mostly, small information transmission quantity, frequent exchange, simple protocol, high real-time requirement and the like.
The LPLC MODEM (hereinafter referred to as MODEM) needs to be able to work normally when an electrified section or a locomotive passes through, so that it can resist large electromagnetic interference. In the data communication process, due to the influence of comprehensive factors such as external noise, the waveform of the signal received by the receiving end is damaged, which may result in wrong judgment of information and wrong codes. Therefore, in order to enhance the reliability of LPLC communication, the outdoor online monitoring system of the trackside equipment encodes transmission data based on an error control technology to reduce the error rate.
From the viewpoint of error control, channels are classified into burst channels, random channels and mixed channels according to the distribution rule of error codes caused by additive noise. In a burst channel, error codes are concentrated, namely, more error code elements appear in a certain shorter time period; in a random channel, error codes appear randomly; the hybrid channel includes both burst error codes and random error codes. According to the characteristics of the electrified section, the LPLC channel in the outdoor online monitoring system of the trackside equipment belongs to a mixed channel. Error control coding techniques can be mainly classified into Forward Error Correction (FEC), automatic repeat request (ARQ), and hybrid automatic repeat request (HARQ) techniques.
FEC techniques involve the addition of parity symbols to a sequence of transmitted information symbols, which parity symbols are used to correct errors in the received information sequence when received. FEC does not need to retransmit data frames, and there is no delay due to retransmission, so that real-time performance is good, but in order to implement error correction, more parity symbols need to be added, and the device is complicated. The ARQ technique is to add a parity symbol in a transmitted information symbol sequence, and when a data frame received by a receiving end is error-coded, a retransmission command is transmitted to the transmitting end to request retransmission of the frame data. When the ARQ technology is adopted, only error detection can be carried out, error correction can not be carried out, fewer supervision code elements are required, and therefore the transmission rate of effective code elements is higher. The HARQ technique is an error control technique combining FEC and ARQ. In the HARQ system, ARQ processing is carried out on a received data frame by using FEC, after ARQ for many times, if the data still has errors, the data is discarded, and retransmission of the frame data is requested to a sending end, and the HARQ error control mode can not only detect errors but also correct errors, combines the advantages of FEC and ARQ, and avoids the defects of the FEC and ARQ to a certain extent.
In order to achieve the above object, one aspect of the present invention provides an outdoor on-line monitoring system for trackside equipment, the system comprising:
the data acquisition unit is used for acquiring frequency shift signal parameters of the track circuit, track circuit voltage, lighting loop parameters of the annunciator, actions of the turnout switch and notch characteristic parameters;
the data transmission unit is used for transmitting the data acquired by the data acquisition unit to the PLC protocol converter through the LPLC channel;
and the PLC protocol converter is used for carrying out protocol conversion, transmitting the converted data to the communication interface extension set and transmitting the data to the signal centralized monitoring station machine through the communication interface extension set.
Wherein, the data acquisition unit specifically is outdoor monitoring acquisition sensor, includes: the system comprises an interval frequency shift outdoor monitoring sensor, a 25Hz track circuit outdoor monitoring sensor, a signal machine outdoor monitoring sensor and a turnout switch machine outdoor monitoring sensor.
The outdoor monitoring and collecting sensor is used for collecting interval frequency shift current signals, 220V/50Hz power frequency strong current, 25Hz phase-sensitive track circuit current, direct current signals, 220V/50Hz power frequency strong voltage, 25Hz phase-sensitive track circuit voltage, direct voltage signals, temperature and switching value.
Wherein, the interval frequency shift current signal includes: the current of the cable sides of a transmitting end and a receiving end of the interval frequency shift signal, and the current of the steel rail lead wires of the transmitting end and the receiving end; the 220V/50Hz power frequency strong current, 25Hz phase-sensitive track circuit current or direct current signal comprises: switch machine action current and 25Hz phase-sensitive track circuit current; the 220V/50Hz power frequency strong electric voltage, 25Hz phase-sensitive track circuit voltage or direct current voltage signal comprises: the interval signal lighting unit inputs voltage, outputs main filament voltage and 25Hz phase-sensitive track circuit voltage, and the switching value comprises: the states of a lighting relay and a safety relay of the interval signal machine, the action switching value of a switch machine and the action switching value of a 25Hz phase-sensitive track circuit. The signals are key parameters reflecting the running states of trackside equipment such as outdoor annunciators, track circuits, point switches and the like, the running states and the application quality of trackside signal equipment are monitored in real time by acquiring the signals, instantaneous abnormal conditions are captured, and early warning analysis of trackside signal equipment is realized, so that a complete indoor and outdoor signal equipment monitoring system is constructed, the early warning and comprehensive analysis capabilities of a centralized monitoring system are improved, and data support is provided for state repair of railway station equipment.
Wherein, the PLC protocol converter includes:
the transformer coupling unit is used for isolating 220V/50Hz power frequency strong current on the power line from the PLC protocol converter, filtering out narrow-band interference and pulse interference brought by an LPLC channel, and extracting a carrier signal from the power frequency strong current;
the carrier output unit is used for amplifying and filtering signal power;
the carrier input unit is used for filtering, amplifying and shaping the received carrier signal;
the DC100V power supply unit is used for providing stable power supply voltage for each component unit circuit of the PLC protocol converter;
the protocol conversion unit is used for carrying out communication protocol conversion processing;
and the communication unit is used for transmitting the converted data to the communication interface extension set.
The communication interface extension set is installed indoors, information interaction based on a token ring is achieved through an RS485 bus with an outdoor data acquisition unit, information interaction based on a matrix period is achieved through a CAN bus with an indoor track circuit diagnosis host, and information interaction based on Socket is achieved through a LAN (local area network) with a signal centralized monitoring station machine.
On the other hand, the application also provides a communication error control method, which is applied to an outdoor online monitoring system of trackside equipment, and the method comprises the following steps:
step 1: if the communication interface extension monitors that the received current data frame error code exceeds a set threshold, turning to the step 2, otherwise, turning to the step 10;
step 2: if the data acquisition unit detects that the current LPLC transmission time slot meets the requirement of transmitting 1 frame of data, the retransmission is automatically requested, otherwise, the step 8 is switched;
and step 3: if the communication interface extension monitors that the automatic retransmission times of the data acquisition unit exceed the current maximum limit value, turning to the step 4, otherwise, turning to the step 1;
and 4, step 4: the communication interface extension polls whether all relays and terminals are on-line or not, if all nodes are on-line, the step 5 is carried out, otherwise, the step 11 is carried out;
and 5: if the number of times of the data frame halving of the communication interface extension request data acquisition unit exceeds the current maximum limit value, turning to the step 8, otherwise, turning to the step 6;
step 6: if the data acquisition unit successfully responds to the data frame halving command, halving the data frame and turning to the step 7, otherwise, turning to the step 5;
and 7: if the communication interface extension monitors that the number of times of halving the data frame exceeds the current maximum limit value, turning to the step 8, otherwise, turning to the step 5;
step 8, implementing an optimized LPLC communication strategy to increase communication time slots, and turning to step 9;
and step 9: if the communication interface extension monitors that the number of times of the optimized communication strategy exceeds the current maximum limit value, an LPLC communication mechanism is reconstructed, and the step 1 is switched;
step 10: the communication interface extension waits for receiving next frame data;
step 11: if the communication interface extension monitors that the disconnection point reconnection of the offline node is successful, turning to the step 1, otherwise, turning to the step 12;
step 12: if the communication interface extension monitors that the reconnection times of the single node breakpoint exceed the current maximum limit value, the communication interface extension breaks the physical link with the corresponding node, gives an alarm locally and sends the alarm information to the signal centralized monitoring station, otherwise, the step 11 is switched.
Further, the reconstructing LPLC communication mechanism specifically includes:
step A: sorting LPLC nodes according to the code error standard exceeding severity of each node to form a circular linked list;
and B: b, matching the current network information table according to the node information of the circular linked list generated in the step A, and classifying the relay numbers and the equipment numbers in sequence to respectively form a relay network information table and an equipment network information table;
and C: if the relay nodes are balanced, turning to the step D, otherwise, turning to the step J;
step D: in the current relay node transmission time slot, according to the severity degree of the error code exceeding standard, the network is disconnected and the terminal nodes connected in the relay range are reconnected in sequence;
step E: if the disconnection and reconnection of the current terminal node are successful, turning to the step F, otherwise, turning to the step H;
step F: if the terminal nodes connected in the relay range are searched, turning to the step G, otherwise, turning to the step D;
step G: regenerating a network information table, counting the number of online nodes, and recalculating the communication time slot according to the currently set round testing time;
step H: if the current terminal node is time-out after the network is disconnected and reconnected, removing the terminal node, giving an alarm locally, sending the alarm information to a signal centralized monitoring station machine, and turning to the step I, otherwise, turning to the step E;
step I: if the load of the relay node is balanced, turning to the step F, otherwise, turning to the step J;
step J: and B, reconstructing a relay mechanism according to the current network information table and turning to the step B.
Further, the maximum value of the automatic repeat request times is the ratio of the wheel measurement time of the trackside equipment to the refreshing time of the field bus, and the maximum value is rounded downwards; the maximum value of the number of times of dividing data frames is determined as the ratio of the current LPLC transmission time slot to the refresh time of the field bus, and the maximum value is rounded downwards; a relay node or a concentrator with a relay function or a communication terminal is added by an optimized LPLC communication strategy, and the maximum value of the optimization times is determined by the maximum limit value of the added relay node; the LPLC networking algorithm is optimized based on the data transport layer to reconstruct the LPLC communication mechanism.
Further, the optimized LPLC communication strategy is jointly customized based on communication time slots and halved data frames.
The LPLC communication strategy is optimized in such a way that an appropriate relay node or a concentrator or a communication terminal having a relay function is added, and the maximum value of the number of times of optimization is determined by the maximum limit value of the added relay node. And if the communication time slot is monitored to be insufficient for transmitting 1 frame of data, immediately implementing the optimized LPLC communication strategy, and otherwise, sequentially executing automatic repeat request (ARQ), halving the data frame and the optimized LPLC communication strategy from bottom to top.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
the data acquisition and processing are completed through the acquisition automation equipment, the online high-efficiency monitoring is realized, a communication error control mechanism is added in the narrow-band high-speed low-voltage power line carrier communication adopted by the trackside equipment outdoor online monitoring system, and when the error code of a transmitted data frame is detected to exceed the standard, a control strategy is implemented in a grading manner, so that the communication fault range is reduced, the reliability of the trackside equipment outdoor online monitoring system is improved, and the monitoring efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a block diagram of an outdoor track signaling device monitoring system according to the present application;
FIG. 2 is a block diagram of an outdoor monitoring and acquisition sensor according to the present application;
fig. 3 is a block diagram of a PLC protocol converter according to the present application;
fig. 4 is a block diagram of a communication interface extension in the present application;
FIG. 5 is a schematic diagram of a communication error control flow in the present application;
fig. 6 is a schematic flow chart of an implementation of the reconstructed LPLC communication mechanism in the present application.
Detailed Description
The invention provides an outdoor on-line monitoring system for trackside equipment and a communication error control method thereof, which solve the technical problems that the conventional outdoor monitoring method for trackside equipment can only statically implement error control according to a set configuration file, has low efficiency and seriously interferes with the driving organization, and realize the technical effects of reducing the communication fault range, improving the reliability of the outdoor on-line monitoring system for trackside equipment and improving the monitoring efficiency.
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
An outdoor on-line monitoring system for trackside equipment, comprising: the system comprises five parts of interval frequency shift outdoor monitoring, 25Hz track circuit outdoor monitoring, signal machine outdoor monitoring, turnout switch machine outdoor monitoring, a mechanical indoor communication system and the like, and a monitoring object can be configured according to an actual railway station yard to select a matching subsystem. The interval frequency shift outdoor monitoring subsystem is mainly used for monitoring frequency shift signal parameters of a track circuit by an electric service department so as to ensure that the frequency shift equipment is in a good working state; the 25Hz track circuit outdoor monitoring subsystem is mainly used for monitoring the voltage of the 25Hz track circuit by an electric service department so as to ensure reliable shunt; the annunciator outdoor monitoring subsystem is mainly used for monitoring the annunciator lighting loop parameters by the electric service department so as to ensure reliable dispatching of train operation; the turnout switch machine outdoor monitoring subsystem is mainly used for an electric department to monitor the action of the turnout switch machine and the characteristic parameters of a gap so as to ensure the stable operation of a train. Except for different monitoring objects, the above subsystems use the same software and hardware platforms and monitoring schemes, so the following description of each subsystem is not specifically described.
The outdoor on-line monitoring system of the trackside equipment mainly comprises outdoor and indoor equipment, the outdoor equipment mainly comprises an outdoor monitoring acquisition sensor, the indoor part mainly comprises functional units such as an indoor distribution board, an indoor lightning protection module, an AC220V power isolation box, a power screen, a PLC protocol converter, a communication interface extension set and a signal centralized monitoring station machine, and all the functional units are all indispensable. The outdoor monitoring and collecting sensor finishes the collection of electric characteristic parameters of an outdoor turnout switch machine, a track circuit and the like, transmits data to the indoor PLC protocol converter through a high-speed low-voltage power line carrier technology, transmits the data to the communication interface extension through an RS485 bus by the indoor PLC protocol converter, and is connected with the signal centralized monitoring station machine through a LAN (local area network) network. A block diagram of the outdoor track signal equipment monitoring system is shown in fig. 1.
The outdoor monitoring and collecting sensor is mainly used for collecting interval frequency shift current signals, 50Hz/25Hz or direct current voltage signals, temperature and switching value in a real-time lossless manner, and the structural block diagram of the outdoor monitoring and collecting sensor is shown in figure 2.
In fig. 2, the interval frequency shift current signal mainly includes cable side currents of a transmitting end and a receiving end of the interval frequency shift signal in the ZPW-2000A/K interval track circuit outdoor monitoring system, and steel rail lead wire currents (long inside, long outside, short inside, and short outside) of the transmitting end and the receiving end; the 50Hz/25Hz or DC current signal mainly comprises a switch machine action current and a 25Hz phase-sensitive track circuit current; the 50Hz/25Hz or DC voltage signal mainly comprises an input voltage (220V) of an interval signal lighting unit, an output main filament voltage (11V) and a 25Hz phase-sensitive track circuit voltage, and the switching value mainly comprises an interval signal machine lighting relay and a safety relay state, a switch machine operation switching value and a 25Hz phase-sensitive track circuit operation switching value. The frequency, phase angle and power factor can be obtained quickly by invoking the relevant algorithm with directly measurable signal values as shown in fig. 2.
The analog/digital conversion unit, the DMA transmission unit and the CORTEX-M data processing platform in fig. 2 constitute a trackside device field layer data acquisition, analysis and processing platform of the trackside device outdoor online monitoring technology, which are all important modules in the advanced MCU based on the STM32F40 series ARM core 32 bits of the ST company. The analog/digital conversion unit (A/DC) is based on an epsilon-delta modulator principle and is a continuous sampling mode with 12 bits of 3 channels and 2.4MSPS sampling rate and a triple insertion mode with 24 channels and 7.2MSPS sampling rate; the CORTEX-M data processing platform includes an instruction (I) bus, a data (D) bus, and an S bus.
The PLC protocol converter is installed in the machine room, and performs real-time protocol conversion between RS485 and high-speed low-voltage power line carrier (LPLC), and a block diagram of the PLC protocol converter is shown in fig. 3.
The transformer coupling unit in fig. 3 isolates 220V/50Hz power frequency strong current on the power line from the PLC protocol converter, filters out narrowband interference and pulse interference caused by the LPLC channel, extracts the carrier signal from the power frequency strong current, has an overvoltage protection effect on the circuit, and can effectively weaken the influence of channel equipment shutoff on the PLC protocol converter. The carrier output unit consists of a power amplifier and a band-pass filter and plays a role in power amplification and filtering for signals, and the carrier input unit consists of an input band-pass filter and an input amplification circuit and plays a role in filtering, amplifying and shaping for received carrier signals. The DC100V power supply unit provides stable power supply voltage for each component unit circuit of the PLC protocol converter, and mainly comprises a voltage reduction circuit, a direct current voltage stabilizing circuit and a linear voltage stabilizer. The voltage reduction circuit is responsible for converting alternating current power frequency high voltage into direct current stable low voltage, consists of a rectifier bridge and a constant current source circuit, and can realize 220V alternating current power supply through the voltage reduction circuit. The direct current voltage stabilizing circuit carries out filtering, voltage stabilizing and overcurrent protection on the direct current voltage output by the voltage reducing circuit, and the power supply voltage of each unit circuit can be adjusted according to requirements. The linear voltage stabilizer is used for outputting working voltage required by unit circuits such as FSK modulation and demodulation, LPLC/485 protocol conversion and the like.
The communication interface extension set is arranged in a mechanical room, realizes information interaction based on a token ring with an outdoor monitoring and collecting sensor through an RS485 bus, realizes information interaction based on a matrix period with an indoor track circuit diagnosis host through a CAN bus, and realizes information interaction based on Socket with a signal centralized monitoring station machine through a LAN (local area network). The structure block diagram is shown in fig. 4.
In fig. 4, the RS485 communication unit relates to 8-channel interface circuit, RS485-RS232 circuit and bottom layer driving part, and the highest supported communication rate is 115200 bps; the CAN communication unit relates to an 8-path interface circuit and a bottom layer driving part, and the highest communication rate is 1 Mbps; the LAN communication unit relates to 2 paths of interfaces and a bottom layer driving part, wherein 1 path is a self-contained 10M/100M adaptive network interface of an ARM-based CPU (ATMELAT91SAM9263), and 1 path is an expanded 10M/100M adaptive network interface. The interrupt priority arbitration unit based on the Complex Programmable Logic Device (CPLD) is used for scheduling the communication tasks of field equipment in a hard real-time manner, seamlessly matching the information interaction based on the Linux embedded soft real-time system, and simultaneously avoiding thread deadlock, interface communication extension crash and outdoor online monitoring system paralysis of trackside equipment. And the data dump unit based on a Static Random Access Memory (SRAM) caches data according to the interrupt vector table established by the CPLD interrupt priority arbitration unit. An ARM-based CPU (ATMEL AT91SAM9263) realizes an application-oriented system scheduling strategy combining a table look-up method and a dynamic decision tree algorithm based on a Linux operating system, combines the advantages of priority preemption scheduling and time-sharing scheduling, ensures the real-time performance of the system and reduces the occurrence of thread starvation. The display control terminal is used for realizing a human-computer interaction interface and mainly comprises parameter configuration, key state display, alarm display, confirmation and control.
The communication error control mechanism is divided into four levels of implementation control strategies, specifically, automatic repeat request, data frame halving, LPLC communication strategy optimization and LPLC communication mechanism reconstruction. The method comprises the steps of realizing an automatic request retransmission and halved data frame error control strategy based on an outdoor monitoring acquisition sensor, and realizing an optimized LPLC communication strategy and a reconstructed LPLC communication mechanism error control strategy based on a communication interface extension. The specific implementation method comprises the following steps:
step 1: if the communication interface extension monitors that the received current data frame error code exceeds a set threshold, turning to the step 2, otherwise, turning to the step 10;
step 2: if the outdoor monitoring acquisition sensor detects that the current LPLC transmission time slot is enough to transmit 1 frame of data, automatically requesting retransmission (ARQ), otherwise, turning to step 8;
and step 3: if the communication interface extension monitors that the automatic retransmission times of the outdoor monitoring acquisition sensor exceed the current maximum limit value, turning to the step 4, otherwise, turning to the step 1;
and 4, step 4: the communication interface extension polls whether all relays and terminals are on-line or not, if all nodes are on-line, the step 5 is carried out, otherwise, the step 11 is carried out;
and 5: if the number of times of halving data frames of the outdoor monitoring acquisition sensor exceeds the current maximum limit value, turning to the step 8, otherwise, turning to the step 6;
step 6: if the outdoor monitoring acquisition sensor responds to the command of halving the data frame successfully, halving the data frame, and turning to the step 7, otherwise, turning to the step 5;
and 7: if the communication interface extension monitors that the number of times of halving the data frame exceeds the current maximum limit value, turning to the step 8, otherwise, turning to the step 5;
step 8, implementing an optimized LPLC communication strategy to increase communication time slots, and turning to step 9;
and step 9: if the communication interface extension monitors that the number of times of the optimized communication strategy exceeds the current maximum limit value, an LPLC communication mechanism is reconstructed, and the step 1 is switched;
step 10: the communication interface extension waits for receiving next frame data;
step 11: if the communication interface extension monitors that the disconnection point reconnection of the offline node is successful, turning to the step 1, otherwise, turning to the step 12;
step 12: if the communication interface extension monitors that the reconnection times of the single node breakpoint exceed the current maximum limit value, the communication interface extension disconnects the physical link with the corresponding node and locally alarms and sends the alarm information to the signal centralized monitoring station, otherwise, the step 11 is switched.
The specific steps of reconstructing the LPLC communication mechanism are as follows:
step 1: sorting LPLC nodes according to the code error standard exceeding severity of each node to form a circular linked list;
step 2: matching the current network information table according to the node information of the circular linked list generated in the step 1, and sequentially classifying the relay numbers and the equipment numbers to respectively form a relay network information table and an equipment network information table;
and step 3: if the relay nodes are balanced, turning to the step 4, otherwise, turning to the step 10;
and 4, step 4: in the current relay node transmission time slot, according to the severity degree of the error code exceeding standard, the network is disconnected and the terminal nodes connected in the relay range are reconnected in sequence;
and 5: if the disconnection and reconnection of the current terminal node are successful, turning to the step 6, otherwise, turning to the step 8;
step 6: if the terminal nodes connected in the relay range are searched, turning to the step 7, otherwise, turning to the step 4;
and 7: regenerating a network information table, counting the number of online nodes, and recalculating the communication time slot according to the currently set round testing time;
and 8: if the current terminal node is out of network connection, removing the terminal node, giving an alarm locally, sending the alarm information to a signal centralized monitoring station machine, and turning to the step 9, otherwise, turning to the step 5;
and step 9: if the load of the relay node is balanced, turning to the step 6, otherwise, turning to the step 10;
step 10: and (5) reconstructing a relay mechanism according to the current network information table and turning to step 2.
The maximum value of the automatic repeat request times is determined as the ratio of the wheel measurement time of the trackside equipment to the refreshing time of the field bus, and is rounded downwards; the maximum value of the number of times of dividing data frames is determined as the ratio of the current LPLC transmission time slot to the refresh time of the field bus, and the maximum value is rounded downwards; adding a proper relay node or a concentrator or a communication terminal with a relay function by using an optimized LPLC communication strategy, wherein the maximum value of the optimization times is determined by the maximum limit value of the added relay node; the LPLC fast networking algorithm is optimized based on the data transport layer to reconstruct the LPLC communication mechanism.
The optimized LPLC communication strategy is jointly customized based on communication time slots and halved data frames.
The outdoor on-line monitoring system of the trackside equipment adopts HARQ technology to realize LPLC communication error control, 16-bit CRC based on CRC16-CCITT standard is set as a supervision code element, and the ARQ times are mainly determined by the combination of the current data transmission time slot and the data frame length of an LPLC bus. Which implements a flow chart as in figure 5. In fig. 5, the error rate of the received data frame is determined by the communication failure threshold in the communication configuration, and the LPLC transmission timeslot is determined as the ratio of the round-robin measurement time of the trackside device to the number of communication nodes, and the unit is ms; the maximum ARQ retransmission times is determined as the ratio of the wheel measurement time of the trackside equipment to the field data acquisition refreshing time, and is rounded downwards; the maximum value of the bisection times is determined as the ratio of the current LPLC transmission time slot to the field data acquisition refreshing time, and is rounded downwards; optimizing LPLC communication strategy in a mode of adding proper relay nodes or concentrators with relay functions or communication terminals, wherein the maximum value of the optimization times is determined by the maximum limit value of the added relay nodes; the LPLC fast networking algorithm is optimized based on the data transport layer to reconstruct the LPLC communication mechanism, and a flowchart for implementing the reconstructed LPLC communication mechanism is shown in fig. 6.
And if the communication time slot is monitored to be insufficient, the optimized LPLC communication strategy is immediately implemented, so that the diffusion of communication faults is effectively prevented, the paralysis of an LPLC communication network is avoided, and the technical problem that the error control can only be statically implemented according to a set configuration file in the prior art is solved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A communication error control method is characterized in that the method is used for an outdoor online monitoring system of trackside equipment;
outdoor on-line monitoring system of trackside equipment includes:
the data acquisition unit is used for acquiring frequency shift signal parameters of the track circuit, track circuit voltage, lighting loop parameters of the annunciator, actions of the turnout switch and notch characteristic parameters;
the data transmission unit is used for transmitting the data acquired by the data acquisition unit to the PLC protocol converter through a narrow-band high-speed low-voltage power line carrier communication (LPLC) channel;
the PLC protocol converter is used for carrying out protocol conversion, transmitting the converted data to the communication interface extension set and transmitting the data to the signal centralized monitoring station machine through the communication interface extension set;
the communication error control method includes:
step 1: if the communication interface extension monitors that the received current data frame error code exceeds a set threshold, turning to the step 2, otherwise, turning to the step 10;
step 2: if the data acquisition unit detects that the current LPLC transmission time slot meets the requirement of transmitting 1 frame of data, the retransmission is automatically requested, otherwise, the step 8 is switched;
and step 3: if the communication interface extension monitors that the automatic retransmission times of the data acquisition unit exceed the current maximum limit value, turning to the step 4, otherwise, turning to the step 1;
and 4, step 4: the communication interface extension polls whether all relays and terminals are on-line or not, if all nodes are on-line, the step 5 is carried out, otherwise, the step 11 is carried out;
and 5: if the number of times of the data frame halving of the communication interface extension request data acquisition unit exceeds the current maximum limit value, turning to the step 8, otherwise, turning to the step 6;
step 6: if the data acquisition unit successfully responds to the data frame halving command, halving the data frame and turning to the step 7, otherwise, turning to the step 5;
and 7: if the communication interface extension monitors that the number of times of halving the data frame exceeds the current maximum limit value, turning to the step 8, otherwise, turning to the step 5;
and 8: implementing an optimized LPLC communication strategy to increase communication time slots, and turning to step 9;
and step 9: if the communication interface extension monitors that the number of times of the optimized communication strategy exceeds the current maximum limit value, an LPLC communication mechanism is reconstructed, and the step 1 is switched;
step 10: the communication interface extension waits for receiving next frame data;
step 11: if the communication interface extension monitors that the disconnection point reconnection of the offline node is successful, turning to the step 1, otherwise, turning to the step 12;
step 12: if the communication interface extension monitors that the reconnection times of the single node breakpoint exceed the current maximum limit value, disconnection and disconnection are carried out
And the corresponding nodes are physically linked, alarm is given locally and alarm information is sent to the signal centralized monitoring station, otherwise, the step 11 is carried out.
2. The communication error control method according to claim 1, wherein the data acquisition unit is an outdoor monitoring acquisition sensor, and comprises: the system comprises an interval frequency shift outdoor monitoring sensor, a 25Hz track circuit outdoor monitoring sensor, a signal machine outdoor monitoring sensor and a turnout switch machine outdoor monitoring sensor.
3. The communication error control method according to claim 2, wherein the outdoor monitoring and collecting sensor is used for collecting interval frequency shift current signals, 220V/50Hz power frequency strong current, 25Hz phase sensitive track circuit current, direct current signals, 220V/50Hz power frequency strong voltage, 25Hz phase sensitive track circuit voltage, direct current voltage signals, temperature and switching value.
4. The communication error control method according to claim 1, wherein the PLC protocol converter includes:
the transformer coupling unit is used for isolating 220V/50Hz power frequency strong current on the power line from the PLC protocol converter, filtering out narrow-band interference and pulse interference brought by an LPLC channel, and extracting a carrier signal from the power frequency strong current;
the carrier output unit is used for amplifying and filtering signal power;
the carrier input unit is used for filtering, amplifying and shaping the received carrier signal;
the DC100V power supply unit is used for providing stable power supply voltage for each component unit circuit of the PLC protocol converter;
the protocol conversion unit is used for carrying out communication protocol conversion processing;
and the communication unit is used for transmitting the converted data to the communication interface extension set.
5. The communication error control method according to claim 1, wherein the communication interface extension is installed indoors, and implements information interaction based on a token ring with an outdoor data acquisition unit through an RS485 bus, implements information interaction based on a matrix cycle with an indoor track circuit diagnosis host through a CAN bus, and implements information interaction based on a Socket with a signal centralized monitoring station through a LAN.
6. The method according to claim 1, wherein said reconfiguring the LPLC communication scheme specifically comprises:
step A: sorting LPLC nodes according to the code error standard exceeding severity of each node to form a circular linked list;
and B: b, matching the current network information table according to the node information of the circular linked list generated in the step A, and classifying the relay numbers and the equipment numbers in sequence to respectively form a relay network information table and an equipment network information table;
and C: if the relay nodes are balanced, turning to the step D, otherwise, turning to the step J;
step D: in the current relay node transmission time slot, according to the severity degree of the error code exceeding standard, the network is disconnected and the terminal nodes connected in the relay range are reconnected in sequence;
step E: if the disconnection and reconnection of the current terminal node are successful, turning to the step F, otherwise, turning to the step H;
step F: if the terminal nodes connected in the relay range are searched, turning to the step G, otherwise, turning to the step D;
step G: regenerating a network information table, counting the number of online nodes, and recalculating the communication time slot according to the currently set round testing time;
step H: if the current terminal node is time-out after the network is disconnected and reconnected, removing the terminal node, giving an alarm locally, sending the alarm information to a signal centralized monitoring station machine, and turning to the step I, otherwise, turning to the step E;
step I: if the load of the relay node is balanced, turning to the step F, otherwise, turning to the step J;
step J: and B, reconstructing a relay mechanism according to the current network information table and turning to the step B.
7. The communication error control method according to claim 6, wherein the maximum number of automatic repeat request times is a ratio of a round-robin time of the trackside device to a refresh time of the fieldbus, and rounded down; the maximum value of the number of times of dividing data frames is determined as the ratio of the current LPLC transmission time slot to the refresh time of the field bus, and the maximum value is rounded downwards; embodiments of optimizing LPLC communication strategies include: adding relay nodes, a concentrator with a relay function and communication terminals with the relay function; the maximum value of the optimization times is determined by the maximum limit value of the added relay nodes; the LPLC networking algorithm is optimized based on the data transport layer to reconstruct the LPLC communication mechanism.
8. The method of claim 7, wherein the optimized LPLC communication strategy is jointly customized based on communication time slots and bisection data frames.
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| CN109229159A (en) * | 2018-09-17 | 2019-01-18 | 兰州交通大学 | Railway signal digitizes trackside distribution control system |
| CN109188991B (en) * | 2018-11-20 | 2020-11-03 | 上海新纪元机器人有限公司 | Control signal transmission method and device |
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| CN110988650A (en) * | 2019-11-22 | 2020-04-10 | 佳讯飞鸿（北京）智能科技研究院有限公司 | Track circuit state monitoring system and method |
| CN110865297B (en) * | 2019-12-04 | 2022-05-13 | 绵阳市维博电子有限责任公司 | Phase-sensitive track voltage phase angle comprehensive acquisition sensor |
| CN112519832B (en) * | 2020-11-30 | 2023-02-28 | 深圳市长龙铁路电子工程有限公司 | Turnout control device and turnout control method |
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