CN212098886U

CN212098886U - Redundant structure track circuit reader

Info

Publication number: CN212098886U
Application number: CN202020804499.2U
Authority: CN
Inventors: 史宏飞; 孙国营; 王瑞; 母正晖; 赵立娜; 李智宇; 刘贞
Original assignee: CRSC Research and Design Institute Group Co Ltd
Current assignee: CRSC Research and Design Institute Group Co Ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-12-08
Anticipated expiration: 2030-05-15

Abstract

The utility model relates to a redundant structure track circuit reader, which comprises a TCR main machine and a receiving coil; the TCR main machine is used for receiving and processing the track signal from the receiving coil, decoding corresponding locomotive signal information and transmitting the decoded locomotive signal information to the ATP; the receiving coil is used for receiving track signals from the track circuit through an electromagnetic induction principle and sending the received track signals to the TCR main machine, and the TCR main machine processes the received track signals. The utility model discloses under the condition of interface form, the interface communication agreement that does not change, do not increase ATP, the track circuit reader system of seamless switching trouble has realized that track circuit reader is complete redundant, under the condition that track circuit reader is single to be the trouble, does not need ATP to surely be the system, has improved the operation efficiency of train.

Description

Redundant structure track circuit reader

Technical Field

The utility model belongs to the track circuit field, in particular to redundant structure track circuit reader.

Background

The train operation control system is a core safety system of the current high-speed railway, wherein a track circuit system is used as basic equipment of the train operation control system and is used for checking broken rails of steel rails and occupied positions of trains, and transmitting the number of free sections in front, the conditions of the sections in front and the like to the trains so as to ensure safe and reliable operation of the trains.

As shown in fig. 11, in the prior art, the adaptive application scenario is an ATP (Automatic Train Protection) cold standby mode (only one ATP of 2 systems forming redundancy is powered on, the other ATP is powered off, a power supply of a failure system needs to be turned off, and a power supply of a standby system needs to be turned on during switching). The 2 main control modules are of a redundant structure, only one communication module of the 2 communication modules is in a working state (the communication module connected with the primary system ATP is in a working state, the other communication module is in a standby state, when the ATP is in a system, the original working communication module is down, and the original standby communication module enters the working state after the ATP is in the system).

For example, when the ATP connected to the first communication module is in an operating state, the first communication module is also in the operating state, the second communication module is in a standby state, and the first main control module and the second main control module transmit their output results to the first communication module and are controlled by a command of the first communication module. The first or second master control module determines the working master control module (the other master control module is the standby master control module) through a competition mechanism. The first communication module outputs the information of the working main control module to the ATP, and under the condition that the working main control module fails, the other standby main control module becomes the working main control module (the original working main control module goes down).

This redundancy structure can implement redundancy of the main control module, but cannot implement redundancy of the communication module. If the first communication module in the working state is down due to a fault, the primary ATP connected with the first communication module is down. The vehicle is braked and stopped, a driver needs to cut off the power supply of the original primary system ATP, power the standby system ATP, and start initializing the automatic train protection system again. Because the communication module can not achieve real redundancy, the ATP is needed to be switched under the condition of failure, and the operation efficiency of the train is directly influenced.

Therefore, how to solve the problem that the communication module cannot work redundantly becomes a technical problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention relates to a redundant structure track circuit reader, which comprises a TCR host and a receiving coil;

the TCR main machine is used for receiving and processing the track signal from the receiving coil, decoding corresponding locomotive signal information and transmitting the decoded locomotive signal information to the ATP;

the receiving coil is used for receiving track signals from the track circuit through an electromagnetic induction principle and transmitting the received track signals to the TCR main machine, and the TCR main machine processes the received track signals.

Preferably, the TCR host comprises a master control module, a communication module and a recording module;

the main control module is in communication connection with the communication module through a CAN;

the main control module is used for processing the track signal and then sending the processed result to the communication module;

the communication module is used for receiving the control command of the ATP, comparing and sending the control command to the main control module; the device is used for receiving the track signal sent by the main control module, comparing the track signal and the ATP, and sending the comparison result to the ATP;

and the recording module is used for storing the track signal on the receiving coil.

Preferably, the main control module comprises a first decoding unit and a second decoding unit;

the first decoding unit and the second decoding unit are connected through SPI communication;

the first decoding unit and the second decoding unit are used for independently decoding the track signals respectively, decoding corresponding locomotive signal information and sending the decoded locomotive signal information to the communication module respectively.

Preferably, the communication module comprises a first communication unit and a second communication unit;

the first communication unit and the second communication unit are connected through SPI communication;

the first communication unit: the control command is used for receiving the ATP at the same time with the second communication unit, and after the ATP is compared with the second communication unit and is consistent with the second communication unit, the ATP is sent to the first decoding unit and the second decoding unit;

the second communication unit: and the ATP decoding unit is used for receiving the decoding results of the first decoding unit and the second decoding unit simultaneously with the first communication unit, comparing the decoding results with the first communication unit and sending the decoding results to the ATP.

Preferably, the TCR host is linked to the ATP;

the TCR main machine transmits CAN communication data between the first communication unit and the second communication unit through the monitoring serial port, and is used for realizing competition and redundancy switching of the main and standby systems.

Preferably, the receiving coil comprises a single receiving coil and a combined receiving coil;

the single-receiving coil comprises two coils which are separately arranged to form a first loop and a second loop respectively, and the first loop and the second loop are both connected with the TCR main machine;

the combined receiving coil comprises four coils, and a first sub-coil and a second sub-coil are combined in the four coils;

each end of the train comprises one combined receiving coil, and the first sub-coil and the second sub-coil are respectively arranged on a left wheel and a right wheel of the train;

one coil of the first sub-coil and one coil of the second sub-coil form a third loop, and the other coil of the first sub-coil and the other coil of the second sub-coil form a fourth loop;

the third loop and the fourth loop are both connected with the TCR host.

Preferably, the main control module further comprises a conversion unit;

the conversion unit is used for converting the received track signal into a digital signal before the first decoding unit and the second decoding unit decode the track information.

Preferably, the TCR host detects the third loop and the fourth loop respectively, and determines whether to perform switching between the third loop and the fourth loop according to a detection result.

The technical effects of the utility model: the utility model discloses under the condition of interface form, the interface communication agreement that does not change, do not increase ATP, the track circuit reader system of seamless switching trouble has realized the complete redundancy of track circuit reader. Under the condition of single-train fault of the track circuit reader, ATP (automatic train protection) train switching is not needed, and the operation efficiency of the train is improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a view showing a constitutional structure of a track circuit reader according to an embodiment of the present invention;

FIG. 2 shows a block diagram of a single family TCR host hardware architecture according to an embodiment of the invention;

fig. 3 shows a block diagram of a single receive coil according to an embodiment of the present invention;

fig. 4 shows a block diagram of a left and right receiving coil combined structure according to an embodiment of the present invention;

fig. 5 shows a flow chart of the communication module dual channel uplink data processing according to an embodiment of the present invention;

fig. 6 shows a flow chart of the communication module dual-channel downlink data processing according to the embodiment of the present invention;

FIG. 7 is a block diagram illustrating the redundant use of dual TCR host according to an embodiment of the invention;

fig. 8 is a diagram illustrating a connection relationship between the TCR host and the ATP in the cold standby mode according to an embodiment of the present invention;

fig. 9 shows a block diagram of a redundant configuration track circuit reader according to an embodiment of the present invention;

fig. 10 is a block diagram illustrating a connection between a master control module and a communication module in a track circuit reader according to an embodiment of the present invention;

FIG. 11 shows a block diagram of a track circuit reader in the prior art;

fig. 12 shows a connection block diagram of a master control module and a communication module in a track circuit reader of the related art.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 shows a structural diagram of a Track circuit reader according to an embodiment of the present invention, and as shown in fig. 1, the present invention relates to a Track circuit reader with a redundant structure, which includes a TCR (Track circuit reader) host and a receiving coil.

The TCR main machine receives and processes the track signal from the receiving coil, decodes corresponding locomotive signal information and transmits the decoded locomotive signal information to an Automatic Train Protection (ATP);

the receiving coil receives a track signal from the track circuit through an electromagnetic induction principle, and sends the received track signal to the TCR main machine, and the TCR main machine processes the received track signal.

Illustratively, the track circuit reader is a locomotive signal on-board device, and forms a locomotive signal system together with the ground track circuit. When the first pair of wheels at the front of the train are rolled on the track circuit, the track signal current in the track circuit short-circuited by the first pair of wheels of the train generates a magnetic field around the steel rail, the receiving coil continuously transmits the sensed ground track signal to the TCR host, the TCR host decodes the signal information of the corresponding locomotive after processing, and the decoded locomotive signal information is transmitted to the ATP.

In fig. 1, a power supply provides operating power for the track circuit reader. The receiving coil at the real wire end and the receiving coil at the virtual wire end are connected in a double-end mounting mode of the track circuit reader. When the track circuit reader is installed at a single end, the receiving coil at the real end provides a track signal for the TCR main machine, and the receiving coil at the virtual end does not exist.

Fig. 2 is a block diagram of a hardware architecture of a single TCR host according to an embodiment of the present invention. As shown in fig. 2, the TCR host comprises a master control module, a communication module and a recording module. The main control module is used for processing the track signal and then sending the processed result to the communication module; the communication module is used for receiving the control command of the ATP, comparing and sending the control command to the main control module; the communication module is also used for receiving the track signal sent by the main control module and sending the track signal to the ATP after comparison; and the recording module is used for storing the track signal and the communication information on the receiving coil.

The main control module comprises a first decoding unit, a second decoding unit and a conversion unit;

the main control module adopts a two-out-of-two framework, the first decoding unit and the second decoding unit sample the track signals, the conversion unit converts the track signals into digital signals, the first decoding unit and the second decoding unit respectively independently decode the converted digital signals, decode corresponding locomotive signal information and respectively send the decoded locomotive signal information to the communication module.

The conversion unit is used for converting the track signals sampled by the first decoding unit and the second decoding unit into digital signals. The conversion unit is provided as an AD converter (Analog-to-Digital converter).

The communication module comprises a first communication unit and a second communication unit;

the communication module adopts a 'two-out-of-two' architecture, the first communication unit and the second communication unit simultaneously receive control commands of ATP, the first communication unit and the second communication unit compare the received control commands, and if the comparison results are consistent, the first communication unit simultaneously sends the control commands to the first decoding unit and the second decoding unit. The first communication unit and the second communication unit simultaneously receive the decoding results sent by the first decoding unit and the second decoding unit, compare the decoding results, and if the comparison results are consistent, the second communication unit sends the decoding results to the ATP.

The recording module comprises a recording MCU (Microcontroller Unit) and a recording FPGA (Field Programmable Gate Array).

And the recording FPGA and the recording MCU are matched to sample and convert the track signals on the receiving coil and store the converted data signals. Meanwhile, the MCU records CAN (Controller Area Network) communication and serial port communication data, and stores the recorded data.

The track circuit reader receives track signals via receive coils, wherein the receive coils include a single receive coil and a combined receive coil. Fig. 3 shows a block diagram of a single receiving coil according to an embodiment of the present invention. As shown in fig. 3, the two coils are separately disposed to form a first loop and a second loop, both the first loop and the second loop are connected to one end of the TCR host, and the TCR host at each end can only receive information of the coil at the end under the condition of single-ended installation. As shown in fig. 1, when the track circuit reader is installed on both ends, the TCR host needs to acquire the switching state signal of the i/ii end, and then select to use the coil of the i end or the ii end according to the switching signal state of the i/ii end.

Fig. 4 shows a block diagram of a combined receiving coil according to an embodiment of the present invention. As shown in fig. 4, the combined receiving coil includes four coils, and the four coils are internally combined into a first sub-coil and a second sub-coil. Illustratively, each end of the train comprises one combined receiving coil, the first sub-coil and the second sub-coil are respectively arranged on the left wheel and the right wheel of the train, one coil of the first sub-coil and one coil of the second sub-coil form a third loop, and the other coil of the first sub-coil and the other coil of the second sub-coil form a fourth loop. The third loop and the fourth loop are both connected with the TCR host. When any path of sub-coils in the combined receiving coils are in fault, the TCR main machine can detect and switch the coils in fault, and the reliability of the system is improved.

When the track circuit reader reads the track signal of the receiving coil, it needs to perform fault detection on the receiving coil, as shown in fig. 4, specifically, the fault detection on the receiving coil is as follows:

track signals of two loops in the receiving coil enter the same first decoding unit (or a second decoding unit), the first decoding unit uses the track signal of a receiving coil of a third loop, and if the track signal of the receiving coil of the third loop has no codes and the signal amplitude is smaller than a limit value, the first decoding unit reports the suspected disconnection state of the receiving coil of the third loop to the communication module; when the signal amplitude of the receiving coil of the third loop is larger than the limit value, the receiving coil can receive the track signal; illustratively, no code is the TCR host not resolving the signal, including the failure of the receive coil to receive the signal from the track, and the receive coil being disconnected.

Before the track signal of the receiving coil is sent to the TCR host, the communication module needs to carry out disconnection check on the main control module, and the process is as follows:

when a receiving coil connected with the first decoding unit and the second decoding unit has fault characteristics (suspected disconnection), the first decoding unit and the second decoding unit report the fault characteristics to the communication module, and the communication module judges the fault characteristics. The communication module sends a square wave detection signal to the main control module, the main control module reports the square wave detection state to the communication module, if the reporting results of the first decoding unit and the second decoding unit are both receiving coil faults, the communication module sends a receiving coil switching command to the main control module, and the TCR host machine uses the other receiving coil. If the communication module judges that the fault characteristics of the used receiving coils are inconsistent in the reported results of the first decoding unit and the second decoding unit, the first communication unit sends a simple disconnection checking mode command to the main control module, and when two paths of receiving coils in the command sent to the main control module by the communication module are available, the main control module checks by using a simple disconnection checking method, executes one-time receiving coil switching, and the TCR host uses the other path of receiving coils. If the two receiving coils are disconnected, namely only one receiving coil can be used, the main control module cannot switch the receiving coils when the main control module detects the receiving coils by using the simple disconnection detection method.

Illustratively, after receiving the simple disconnection checking mode command, the first decoding unit of the main control module checks that the currently used signal amplitude of the third loop receiving coil lasts 10s and is less than 20% (example data) of the signal amplitude of the fourth loop receiving coil, and the signal amplitude of the fourth loop receiving coil is greater than a decision threshold, and the first decoding unit decides that the third loop receiving coil is disconnected; after receiving the simple disconnection checking mode command, a second decoding unit of the main control module checks that when the signal amplitude of a receiving coil of a third loop is continuously less than 20% (example data) of the signal amplitude of a receiving coil of a fourth loop for 10s, and the signal amplitude of the receiving coil of the fourth loop is greater than a judgment threshold, the second decoding unit judges that the receiving coil of the third loop is disconnected; when the first decoding unit and the second decoding unit both judge that the third loop receiving coil has a broken line. The first decoding unit and the second decoding unit switch the use of the fourth loop receiving coil.

The two-out process in the track circuit reader:

the main control module in the TCR main machine is mainly used for collecting track signals, decoding the track signals into carrier frequency signals and low frequency signals, and uploading the decoded carrier frequency signals and low frequency signals to the communication module. The communication module is respectively connected with the main control module and the ATP to realize communication between the main control module and the ATP, wherein the communication module can be used for receiving the decoded carrier frequency signal and low frequency signal sent by the main control module and uploading the carrier frequency signal and the low frequency signal to the ATP; and the communication module is also used for receiving the control command issued by the ATP, comparing the control command and sending the control command to the main control module after comparison.

The TCR host and the ATP are connected based on a communication bus. Illustratively, the TCR host and the ATP are in communication connection based on a serial RS422 (electrical characteristics of a balanced voltage digital interface circuit) communication bus, the serial communication rate is 9600bps (Bits per Second: common unit of data transmission rate: bit), 1 bit stop bit is adopted, and no check is carried out. The protocol between the current ATP and the TCR host is a proprietary protocol, which contains frame header, packet type, packet length, timestamp, data, and CRC32(Cyclic redundancy check). When the system is started, the ATP continuously sends timing information to the TCR host for at least 16 times, the interval of each time is fixed, after the ATP receives timing feedback of the TCR host, the ATP sends a timing frame at regular intervals, and the first communication unit and the second communication unit check the time drift condition according to the timestamp of the timing information sent by the ATP.

Exemplary data sent by the ATP to the TCR host include: control command, request self-checking information, carrier frequency signal, frequency locking signal, timing information and the like. The ATP sends a control command to the communication module, and the first communication unit and the second communication unit unpack and compare the received control command respectively; if the control command received by the first communication unit is consistent with the control command received by the second communication unit, the first communication unit and the second communication unit process the control command in a frame splicing mode and send the control command to the main control module through the first communication unit; if the control commands received by the first communication unit and the second communication unit are inconsistent, the first communication unit and the second communication unit compare the unpacked control commands again, and if the continuous preset times are inconsistent, the system is down. The frame splicing mode is as follows: the data content of one communication unit and the frame number and CRC value of another communication unit.

The utility model discloses a track signal that communication module sent to ATP judges as follows:

fig. 5 shows a flow chart of the communication module dual-channel uplink data processing according to the embodiment of the present invention. As shown in fig. 5, the first decoding unit and the second decoding unit of the main control module do not compare decoding results, and send a track signal to the communication module. The first communication unit and the second communication unit can both receive the track signals and are used only when the track signals are consistent, if the communication module does not receive the data sent by the first decoding unit and the second decoding unit in the same period, the data can be lost, redundancy is waited for a fixed period of time, the data is not output in the period of time, and the data is down when the period of time is exceeded.

Illustratively, the first decoding unit, the second decoding unit, the first communication unit and the second communication unit are on the same bus, and the communication addresses are fixed by software. The first communication unit receives data of the first decoding unit and data of the second decoding unit; the first communication unit and the second communication unit interact to obtain 4 parts of data (first) and (second); the first communication unit and the second communication unit respectively carry out logic and processing on the second communication unit to generate data, the fifth communication unit and the fifth communication unit generate data, the first communication unit carries out logic and processing on the third communication unit to generate sent data, and the second communication unit carries out logic and processing on the third communication unit to generate sent data; the first communication unit and the second communication unit interact to obtain data of which the data are the data of which the data are not consistent, and the data are delayed after the data are the data of which the data are not consistent; the first communication unit and the second communication unit interact to obtain data transmission permission ((r) & ltSUB & gt) and ((r) & ltSUB & gt), and the first communication unit and the second communication unit respectively compare the data transmission permission ((r) & ltSUB & gt) and ((r) & ltSUB & gt), and if the data transmission permission ((r) & ltSUB & gt) and the data transmission permission ((r) & ltSUB & gt) are consistent, the. The data sent to the ATP by the communication module is in a frame splicing mode, and the data frame format is as follows: the CRC value and the timestamp of the transmission data (c) generated by the second communication unit + the other part of the transmission data (c) generated by the first communication unit.

For safety-related data (track circuit information), the two-channel comparison processing strategy is as follows:

(1) when the fifth and fifth (the fourth) are generated, if the fifth and fourth are inconsistent, no code is placed; and after the duration exceeds the threshold, shutting down.

(2) When the code is generated, if the code is inconsistent, outputting low-frequency codes with high limiting level (the limiting level is from high to low) within the limiting range of the first time threshold, outputting no codes within the limiting range from the first time threshold to the second time threshold, and outputting delay outside the limiting range of the second time threshold.

(3) After interaction, judging whether the data length and the content are consistent, if so, generating a sending permission of the communication module, if not, generating no permission.

(4) B, interacting the eights and the eights, and if both are allowed to be sent, packaging and sending; and if any one is not allowed to be sent, clearing the sending data of the communication module.

And self-detection results are interacted between the first communication unit and the second communication unit, and the first communication unit is down when the second communication unit fails.

Fig. 6 shows a flow chart of the communication module dual-channel downlink data processing according to the embodiment of the present invention. As shown in fig. 6, a first communication unit and a second communication unit receive ATP data at the same time, the first communication unit receives ATP data (i), the second communication unit receives ATP data (ii), and the first communication unit and the second communication unit interact with each other to obtain 2 parts of data (i); the first communication unit carries out logic and processing to generate sending data, the second communication unit carries out logic and processing to generate sending data, the first communication unit and the second communication unit interact to obtain data, namely data and data, namely data are obtained, the data are delayed when the data are inconsistent, the data are generated by the first communication unit to be sent to permit, and the data are generated by the second communication unit to be sent to permit; the first communication unit and the second communication unit interact to obtain data sending permission (r and r '), the first communication unit and the second communication unit respectively compare the data sending permission (r and r'), and if the data sending permission (r and r) is consistent, the first communication unit sends data to the first decoding unit and the second decoding unit. The data sent by the first communication unit to the first decoding unit and the second decoding unit is in a frame splicing mode, and the data frame format is as follows: the transmission data created by the second communication unit c' + the CRC value of the transmission data created by the first communication unit c.

When the master control module and the communication module in the track circuit reader communicate with each other, the master control module and the communication module need to self-check each other, wherein, the self-check mode is as follows:

1. self-checking the clock:

the first communication unit and the second communication unit supervise clocks of opposite parties mutually, and the detailed flow is as follows:

1) the first communication unit sends a local timestamp a1 to the second communication unit;

2) the second communication unit sends the adjusted time stamp to the first communication unit;

3) the second communication unit receives A1 and makes a difference with its own local timestamp AA1 to get delt 1;

4) repeating the steps, respectively obtaining delt2 … … delt16 by the second communication unit, and calculating an average value delt from delt1 to delt16 to obtain the delt;

5) latching 16 delt values which are continuously calculated;

6) the second communication unit checks the long-term drift of the first communication unit: if the difference between the latest delt and the 16 th last delt is greater than the overtime threshold 1, performing downtime processing;

7) time stamp verification of the first communication unit by the second communication unit: incremental judgment, and downtime if the incremental judgment is not met; the second communication unit is down when the difference value of the timestamps of the first communication unit is greater than the timeout threshold 2; wherein the incrementability represents an increase in the timestamp;

8) time stamp verification of the second communication unit by the first communication unit: incremental judgment, and downtime if the incremental judgment is not met; and the first communication unit is down when the difference value of the timestamps of the second communication unit is greater than the timeout threshold 3.

Illustratively, the timeout threshold 1, the timeout threshold 2 and the timeout threshold 3 represent different time indexes, and the detection index is provided only for the clock self-check of the first communication unit and the second communication unit, and is not limited to the representation manner of the timeout threshold 1, the timeout threshold 2 and the timeout threshold 3, such as the index threshold 1, the index threshold 2 and the index threshold 3.

The clock supervision mechanisms of the first decoding unit and the second decoding unit are as follows:

1) the first decode unit sends the local timestamp YA1 to the second decode unit;

2) the second decoding unit sends the adjusted time stamp to the first decoding unit;

3) after receiving YA1, the second decoding unit makes a difference with its local time stamp YAA1 to obtain Ydelt 1;

4) repeating the steps, respectively obtaining Ydelt2 … … Ydelt16 by the second decoding unit, and calculating Ydelt1 to Ydelt16 to obtain an average value Ydelt;

5) latching 16 continuously calculated Ydelt values;

6) and if the latest Ydelt is greater than the threshold, performing downtime processing.

2. Power-on self-test:

the main control module and the communication module are powered on and self-tested, and the power-on self-test module comprises an RAM (Random Access Memory), an ROM (Read-Only Memory), a CPU (Central Processing Unit) register and an instruction set, and when the power-on self-test module is powered on, the power-on self-test module detects one time of crash of an error. The ROM is checked using CRC 32; the self-checking words of the RAM are recommended by EN50129 (railway safety self-checking system), namely 0x0000, 0x3333, 0x5555, 0xAAA, 0xCCC, 0xFFFF, 0x9999, 0x6666, 0x0F0F and 0xF0F0, the recommended self-checking words of the EN50129 are written into the RAM, then the written self-checking words are read out, whether the written and read self-checking words are the same or not is compared, if the written and read self-checking words are the same, each module operates normally, and if the written and read self-checking words are different, the main control module and the communication module are down.

3. Operation self-checking:

the main control module and the communication module run self-checking and comprise an RAM, an ROM, a CPU register and an instruction set, and the main control module and the communication module detect the fault crash. The CPU register checks are associated with the power-up process. RAM self-checking checks the correctness of a section of memory every cycle.

The 6-bit switching value (including one-bit odd check) collected by the communication module comprises: the ID of the CPU (information of the information processor of the user computer today), the redundancy scheme, the receiver coil height, the frequency hopping pattern and the reserved bits. Comparing the electrical double channels on the collected information to obtain inconsistent downtime; and in the running process, comparing the read configuration with the configuration read by initialization, and carrying out inconsistency downtime. The operating mode of the system can be configured by the switch.

The self-checking between the first decoding unit and the second decoding unit comprises interacting effective voltage, clock time stamp and self-checking result calculated according to ADC (Analog Digital Converter) collected data. The first decoding unit is down when the self-detection has a problem, and the second decoding unit is also down when the self-detection result is interacted. The low frequency and carrier frequency results calculated from the ADC sample data are uploaded to the communication module for comparison. The effective voltage judgment logic of comparison between the first decoding unit and the second decoding unit is that (Vmax-Vmin)/Vmax is less than a set threshold, and the decoding unit is judged to be normal; continuously taking a certain time exceeding a threshold and shutting down; and the recovery is considered as the recovery after one period within the time limit.

For example, as shown in fig. 2, the master control module and the communication module may communicate with each other by means of CAN communication, where the communication rate is 1Mbit/s, and the communication period between the master control module and the communication module is fixed.

The first communication unit is used as a calling party, and broadcasts and sends the synchronous frame and then broadcasts and sends the command data frame. The second communication unit receives the synchronization frame and also receives the issuing timing of the command data frame. The first decoding unit and the second decoding unit delay response according to ID (address) to avoid bus collision; the second communication unit does not send to the master control module (only the second communication unit can send to the ATP, the first communication unit does not send to the ATP).

The sync frame and the command data frame are generally composed of a frame type (sync frame, command frame, status frame), a data length, a source ID, a destination ID, a frame number, a packet CRC32, a packet number, and a timestamp, but the sync frame has no timestamp, and the sync frame is also formed by a frame splicing.

Illustratively, the communication between the first coding unit and the second coding unit: the communication is carried out by adopting SPI (Serial Peripheral Interface), the communication rate is 9375000bps, the first decoding unit and the second decoding unit are interacted at one fixed period, and the self-contained protocol is adopted, wherein the self-contained protocol comprises a frame header, a packet type, a packet length, a packet sequence number, a timestamp, data, CRC32 and a frame tail. The packet sequence number is wrong, and the system is down; CRC error checking and downtime; and the communication between the first decoding unit and the second decoding unit is interrupted and down.

The first communication unit and the second communication unit are communicated with each other: SPI communication is adopted, the communication speed is 1.6875Mbit/s, and the self-owned protocol is adopted and comprises a frame header, a packet type, a time stamp, data, a packet sequence number, CRC32 and a frame tail. The packet sequence number is wrong, and the system is down; CRC error checking and downtime; and the communication between the first communication unit and the second communication unit is interrupted and down.

The packet sequence number error, the CRC error and the downtime caused by communication interruption refer to the following steps: the continuous errors exceed the threshold to be down.

Fig. 7 is a block diagram illustrating a dual TCR host redundancy application according to an embodiment of the present invention. As shown in FIG. 7, the I-type track circuit reader and the II-type track circuit reader are redundantly configured, and the hardware configuration of the two track circuit readers is identical. Therefore, in the dual-system track circuit reader, the main control module is connected with the communication module through CAN communication, and the TCR main machine realizes the competition and the redundancy switching of the main and standby machines through monitoring the communication data of the serial port and the CAN communication data between the second communication units of the communication module.

Fig. 8 is a diagram illustrating a connection relationship between the TCR host and the ATP in the cold standby mode according to an embodiment of the present invention. As shown in FIG. 8, serial I of TCR (A) and serial II of TCR (B) are both connected with serial of ATP (A), and serial II of TCR (A) and serial I of TCR (B) are both connected with serial of ATP (B).

When the track circuit reader is started, the main and standby states are determined as follows:

1. when the serial port I receives ATP data:

1) when the CAN data of the TCR at the opposite side is not received, the TCR is immediately set as a host;

2) when CAN data of the TCR on the opposite side is received and the opposite side is in a standby state, immediately setting the TCR as a host;

3) when the TCR on the opposite side is received as CAN data and the opposite side is in the host state, the TCR is put down immediately.

2. When the serial port II receives ATP data:

1) delaying for a certain time when the CAN data of the TCR at the opposite side are not received, and determining the TCR as the host when the CAN data of the TCR at the opposite side are not received;

2) when the CAN data of the opposite side TCR is received and the state is the standby state, delaying for a certain time, and determining that the opposite side TCR is still in the standby state, namely, the TCR is the host.

3. When the CAN data of the opposite TCR is received and the state of the host is as follows:

1) if the state mark of CAN data received by the TCR on the opposite side is not set, setting the TCR to be down;

2) if the state mark of CAN data received by the opposite side TCR is set, the local TCR is set as a standby machine.

In the operation process of the track circuit reader, the main state and the standby state are switched as follows:

1) when the TCR detects that 2 paths of CAN are all in fault for 4 periods, the standby TCR is raised, and the main TCR is not processed; (considering only downtime and outage)

2) When the TCR detects that only 1 path of CAN has a fault for 4 periods, the standby TCR is down and the main TCR does not process the fault;

3) after the TCR is started up and the ATP establishes communication connection, the main-standby switching can be carried out only once.

Working conditions of the TCR host in ATP hot standby mode:

in the hot standby mode, the physical connection relationship between the TCR host and the ATP is the same as that in the cold standby mode. After the communication module of the TCR main machine works in the hot standby mode, the communication module of the TCR main machine closes the serial port II of the TCR main machine and does not receive an ATP command through the collected 6-bit switching value. The TCR of each system is connected with the ATP respectively by the serial port I of the system and the ATP connected with the serial port I, and then enters a working state.

The communication modules of the two sets of TCR main computers exchange the working modes and the version numbers of the two sets of TCR main computers through CAN communication, and the TCR main computers are down under the condition of inconsistency.

The utility model discloses a redundant mode of two track circuit readers improves the operation efficiency of train. Fig. 9 shows a block diagram of a redundant structure track circuit reader implemented by the present invention, as shown in fig. 9, the i-system track circuit reader and the ii-system track circuit reader have the same structure and are both composed of a main control module and a communication module.

In the case of ATP (train automatic protection system) cold backup (only one of the 2-line ATP constituting redundancy is powered on, the other is powered off, a failed ATP power supply needs to be turned off during switching, and a standby ATP power supply needs to be turned on), the i-line track circuit reader and the ii-line track circuit reader determine the primary line and the standby line of the track circuit reader through a competition mechanism, and as shown in fig. 8, the TCR of the track circuit reader communicates with the ATP through two serial interfaces. When the computer is started, the computer can be judged as the host computer when ATP data are received from the serial port I. The communication module in the track circuit reader of the master system transmits the output result of the communication module to the ATP of the master system and receives the command control of the ATP.

The utility model discloses under the condition of interface form, the interface communication agreement that does not change, do not increase ATP, the track circuit reader system of seamless switching trouble has realized the complete redundancy of track circuit reader. Under the condition of single-train fault of the track circuit reader, ATP (automatic train protection) train switching is not needed, and the operation efficiency of the train is improved.

Illustratively, the I-type track circuit reader is the primary system and the II-type track circuit reader is the backup system. When the main control module or the communication module of the I-system track circuit reader breaks down, the II-system track circuit reader can directly output the output result to the ATP main system host and receive the command control of ATP. And the utility model discloses a track circuit reader accessible configuration switch adapts to the heat of ATP and is equipped with the application mode.

Fig. 10 shows a connection block diagram of the main control module and the communication module in the track circuit reader according to an embodiment of the present invention. As shown in fig. 10, the main control module forms a "second access" channel by the first decoding unit and the second decoding unit, the communication module forms a "second access" structure by the first communication unit and the second communication unit, the results of the first decoding unit and the second decoding unit of the main control module are simultaneously output to the first communication unit and the second communication unit of the communication module, and the first communication unit and the second communication unit of the communication module perform second access comparison on the data of the main control module, and then output to the ATP by the second communication unit after frame splicing.

The ATP command is simultaneously output to the first communication unit and the second communication unit of the communication module, and after the first communication unit and the second communication unit of the communication module perform two-time comparison on ATP data, the ATP data are output to the main control module by the first communication unit after being spliced.

Namely, the 'two-out' structure of the first communication unit and the second communication unit of the communication module is combined with the first decoding unit and the second decoding unit of the main control module and the frame splicing algorithm to realize the 'two-out' safety structure.

Fig. 12 shows a connection block diagram of a master control module and a communication module in a track circuit reader of the related art. As shown in fig. 12, the main control module is configured to have a "two-out" structure by the first decoding unit and the second decoding unit, the first decoding unit and the second decoding unit compare their own operation results and transmit the result to the first communication unit in a frame splicing manner, and the first communication unit separately implements a security structure for 2 types of heterogeneous software in the communication module.

Compared with the prior art, the structure of taking two out of two improves the reliability and safety of ATP. The two sets of logics do the same thing, the results are compared, if the results are consistent, the results are correct, and if the results are inconsistent, the results are wrong. Therefore, the data of the two-series track circuit readers can be strictly synchronized and compared in real time, and the operation result can be output or transmitted only when the two sets run consistently, so that the accuracy of the track circuit reader is improved.

Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A redundant structure track circuit reader is characterized by comprising a TCR host and a receiving coil;

2. The redundant structural track circuit reader of claim 1,

the TCR host comprises a main control module, a communication module and a recording module;

3. The redundant structural track circuit reader of claim 2,

the main control module comprises a first decoding unit and a second decoding unit;

4. The redundant structural track circuit reader of claim 3,

5. The redundant structural track circuit reader of claim 4,

the TCR host is connected with the ATP;

6. The redundant structural track circuit reader of claim 1 or 5,

the receiving coil comprises a single receiving coil and a combined receiving coil;

the third loop and the fourth loop are both connected with the TCR host.

7. The redundant structural track circuit reader of claim 3,

the main control module also comprises a conversion unit;

8. The redundant structural track circuit reader of claim 6,

and the TCR host detects the third loop and the fourth loop respectively and judges whether to execute switching between the third loop and the fourth loop according to the detection result.