Extensible LEU C interface real-time monitoring system

Abstract

The extensible C interface real-time monitoring system comprises the monitoring device, the communication unit, the monitoring server and the data terminal, the monitoring device adopts two means of high-resistance parallel connection and current mutual inductance to achieve collection of LEU C interface signals, the influence on the LEU C interface signals is reduced, and the reliability of the system is improved. After a transponder transmission system is accessed, the existing working state is not influenced; the monitoring equipment has the capability of monitoring multiple paths simultaneously, performs channel configuration according to the number of active transponders connected with the LEU, and disables unused channels; the monitoring equipment has a cascade expansion capability; and the communication unit realizes conversion between a CAN bus and an Ethernet bus. The technical effects of the scheme are that real-time monitoring of LEU C interface signals is realized, the monitoring server can realize fault diagnosis of the LEU C interface through analysis of monitoring data, and fault reason analysis and fault maintenance suggestions are provided.

Description

Technical Field

[0001] The invention relates to the field of railway communication signals, and in particular to an expandable C-interface signal real-time monitoring system. Background Art

[0002] As train speeds continue to increase, relying solely on the block information provided by track circuits can no longer meet the requirements for safe high-speed train travel. It is necessary to add a balise transmission system to provide signal data, control data, location and geographic information, train target operation information, route information, line speed and temporary speed limit, etc. to the train control onboard equipment. LEU (Lineside Electronic Unit) is an important part of the balise transmission system and is a tool and channel for the train control center and active balises to exchange information. The failure of the LEU device directly affects the message transmission of the active balise, causing the EMU to slow down or stop abnormally, disrupting the normal railway transportation order.

[0003] At present, there are two common LEUC interface detection devices. One is the detection system supporting the LEU equipment of each manufacturer. The LEU equipment is equipped with a detection board (the names of boards with similar functions of each manufacturer may be different). The detection board detects the working status of each board inside the LEU host, and makes a preliminary indicator judgment, and packages the data to send it to the monitoring software of the detection system. The monitoring software stores and displays the data. This type of detection system directly judges the normal or abnormal information output by the detection board. It lacks accurate measurement data and data analysis process, and can only play a fault alarm function; another type is to install an antenna for collecting radio frequency signals under the transponder, collect uplink signals and downlink signals in real time, and decode the collected signals by the detection device installed beside the track. After analysis and comparison, the reason for the loss of transponder information and the fault location are given. This type of monitoring equipment needs to be deployed in both the machine room and the track. It is difficult to install, deploy and implement on-site and transmit data back, and it is not easy to deploy and implement; due to the needs of on-site layout and application conditions, the number of transponders mounted on a single LEU device is different, the number of LEUs arranged in the LEU cabinet is different, and the number of LEUs deployed at each site is also different.

[0004] In summary, a test device and a test system with the following functions are needed: the signal of the LEU C interface can be monitored and recorded in real time, and the system can be flexibly arranged according to the on-site LEU deployment situation. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a design scheme of an expandable LEU C interface real-time monitoring system.

[0006] The present invention provides an expandable C-interface real-time monitoring system, characterized in that the real-time monitoring system comprises a monitoring device, a communication unit, a monitoring server and a data terminal.

[0007] The monitoring device uses high-resistance parallel connection and current mutual induction to collect LEU C interface signals, reducing the impact on LEU C interface signals, and will not affect the existing working state after being connected to the transponder transmission system;

[0008] The monitoring device has the capability of multi-channel simultaneous monitoring: one monitoring device corresponds to one LEU, and a single monitoring device can monitor four C-interface channels of the LEU simultaneously, and can configure channels according to the number of active transponders connected to the LEU, disabling unused channels;

[0009] The monitoring device has cascade expansion capability: one LEU cabinet can be deployed with multiple LEUs during actual deployment; the monitoring device uses the same power supply and communication unit during installation and deployment, and the power interface and communication interface of the monitoring device support cascade connection. When adding a LEU, only one monitoring device needs to be added behind the existing monitoring device;

[0010] The communication unit converts the CAN bus or RS485 bus into an Ethernet bus, that is, the communication unit realizes the conversion between the CAN bus and the Ethernet bus, so that the real-time monitoring system can connect multiple LEU cabinets and connect devices between different sites;

[0011] A plurality of the communication units can be connected to the Ethernet network to realize data access to the monitoring server. The monitoring server software supports high-concurrency operations and can support access to a plurality of the monitoring devices.

[0012] The technical effect of the scheme of the present invention is as follows: the real-time monitoring of the LEU C interface signal is realized through the LEU C interface real-time monitoring system, and the monitoring server can realize the fault diagnosis of the LEU C interface by analyzing the monitoring data, and provide fault cause analysis and fault repair suggestions. The present invention can be flexibly deployed according to the actual deployment of the LEU on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] [1] Figure 1 The system structure diagram of the present invention is

[0014] [2] Figure 2 Functional structure diagram of each subsystem of the monitoring system

[0015] [3] Figure 3 Connection diagram of monitoring equipment, LEU and transponder

[0016] [4] Figure 4Design structure diagram for monitoring equipment cascade

[0017] [5] Figure 5 Collect circuit diagrams for monitoring equipment

[0018] [6] Figure 6 The circuit structure diagram of the communication unit DETAILED DESCRIPTION

[0019] The technical scheme of the present invention is further specifically described below by way of examples. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the inventive concept, and these all belong to the protection scope of the present invention.

[0020] The system structure of the scalable LEU C interface real-time monitoring system of the present invention is as follows: Figure 1 As shown, it includes monitoring equipment, communication unit, monitoring server and data terminal. The principles and main functions of each device are as follows:

[0021] Monitoring equipment: The monitoring equipment uses high-resistance parallel connection and current mutual inductance to collect LEU C interface signals. These two collection methods minimize the impact on LEU C interface signals and will not affect the existing working status after being connected to the system. The monitoring equipment collects LEU C interface signals, and the collection content includes C1 voltage, C1 current, C1 impedance, C1 transmission rate, message, C6 voltage, C6 current, C6 impedance, C6 frequency, C4 voltage, etc. The monitoring equipment packages the collected signal information and sends it to the communication unit. The communication interface of the monitoring equipment can be a communication interface in the form of a wireless communication interface (4G, 5G, Wifi, Bluetooth, etc.), an Ethernet interface, an RS485 interface, etc.

[0022] The monitoring device has the following characteristics: 1. It has a multi-channel acquisition function and can acquire up to 4 channels, that is, one monitoring device can acquire 4 channels of one LEU; 2. The 4 channels of the monitoring device are configurable and can be configured according to the number of channels configured by the on-site LEU, disabling unused channels and keeping consistent with the number of channels used by the LEU; 3. It acquires information of the LEU C interface, including C1 voltage, C1 current, C1 impedance, C1 transmission rate, message, C6 voltage, C6 current, C6 impedance, C6 frequency, C4 voltage, etc.; 4. The communication interface and power interface of the monitoring device adopt a cascade design, and the monitoring device can be flexibly assembled and configured according to the deployment of the on-site LEU in the cabinet; 5. The communication interface of the monitoring device uses a CAN bus or a 485 bus; 6. The power interface of the monitoring device uses a 24V power supply; 7. The acquisition of the C interface signal is achieved by high-impedance parallel connection and current mutual induction.

[0023] Communication unit: The monitoring module uses the CAN bus. CAN bus devices can be connected together. The present invention implements a device cascade design based on this feature of the CAN bus. However, the CAN bus does not have remote transmission capabilities. Therefore, a communication unit is introduced into the system. The communication unit realizes the conversion between the CAN bus and the Ethernet bus, so that the system can connect multiple LEU cabinets and connect devices between different sites.

[0024] Monitoring server: The monitoring server consists of four sub-modules: status monitoring, fault diagnosis and prediction, maintenance suggestions, and data storage. Figure 2 As shown. After the data of the monitoring module enters the monitoring server, it first enters the status monitoring module. The status monitoring module first calls the data storage interface for data storage, and then calls the message push interface to push the data to the data terminal; the fault diagnosis and prediction module is a data analysis task running in the background of the server, which is divided into fault diagnosis tasks and fault prediction tasks. Fault diagnosis task: When new data comes in, the fault diagnosis task makes a judgment based on the judgment criteria of each signal indicator; Fault prediction task: The task runs regularly in the background, analyzes the LEU operation data, integrates historical data, predicts the performance change trend of the equipment, and issues a warning message when the equipment performance is found to be reduced. The results of fault diagnosis and fault prediction are stored while being pushed to the display terminal. Maintenance suggestion: The monitoring server imports the fault cause analyzed by the fault diagnosis and prediction module into the maintenance suggestion module, and the maintenance suggestion module outputs the corresponding fault maintenance suggestion. The maintenance suggestion module is an expert system that can quickly give maintenance suggestions based on the fault site, and can be improved and upgraded based on the on-site maintenance effect. With the accumulation of data, the maintenance suggestions given by the maintenance suggestion module will be more accurate.

[0025] The monitoring server has the following features: 1. The monitoring server software supports high-concurrency data processing, can connect to multiple monitoring devices at the same time, and supports the access of multiple data terminals; 2. The data collected by the monitoring device can be recorded in real time and stored in a database or file for subsequent query; 3. The data collected by the monitoring device can be pushed to the client in real time to realize real-time monitoring of the working status of the LEU C interface; 4. The monitoring server can diagnose the working status of the LEU C interface, detect whether the working status is normal, and store the diagnosis results in a database or file; 5. When the monitoring server detects that the LEU C interface status is abnormal, it can send an early warning message or fault information to the data terminal to prompt the abnormality; 6. The monitoring server can give fault repair suggestions based on the abnormal status of the LEU C interface.

[0026] Data terminal: mainly used to display the working status of the monitored equipment in real time, query historical records, receive early warning information, and monitor the connection status of each monitoring device.

[0027] The data terminal has the following features: 1. It can display the working status information of the LEU C interface in real time; 2. It can receive fault information, warning information, fault repair suggestions and other information from the monitoring server; 3. It can query the historical data information of each LEU.

[0028] Example 1: Scalability Design

[0029] The scalability design of this system includes three parts: a. The monitoring device has the ability to monitor multiple channels simultaneously: one monitoring device corresponds to one LEU, and one LEU has 4 C interface channels. A single monitoring device can monitor 4 channels simultaneously. Channels can be configured according to the number of active transponders connected to the LEU, and unused channels can be disabled. The specific connection method is as follows: Figure 3 As shown; b. The monitoring device has cascade expansion capability: a LEU cabinet may be deployed with multiple LEUs in actual deployment. To adapt to this installation and deployment situation, the monitoring device of the present invention supports cascade connection. Its specific design scheme is as follows Figure 4 As shown. The monitoring equipment uses the same power supply and communication unit during installation and deployment. The power interface and communication interface of the monitoring equipment support cascade connection. When adding a LEU device, you only need to add a monitoring device behind the monitoring device; c. The system architecture has expansion capabilities: multiple communication units can be connected to the Ethernet network to realize data access to the monitoring server. The monitoring server software supports high-concurrency operations and can support the access of multiple monitoring devices.

[0030] Example 2: Monitoring equipment design

[0031] Monitoring equipment: The monitoring equipment collects the signal of LEU C interface through the principles of high impedance parallel connection and current mutual induction. Its specific structure is as follows: Figure 5 As shown. The monitoring equipment includes a high-impedance parallel connection module, a current mutual inductance module, a filtering module, a signal shaping circuit, a DBPL demodulation circuit, an equipment ID identification circuit, a processor and a communication module. After the high-impedance parallel connection module collects the C interface voltage signal, the original waveform is input into the filtering module to separate the C1 voltage signal and the C6 voltage signal in the C interface signal, and one C1 voltage signal is sent to the AD pin of the processor to monitor the amplitude of the C1 voltage signal; another C1 voltage signal is sent to the DBPL demodulation circuit, and its baseband code element signal and clock signal are obtained through the demodulation circuit, and are respectively input into the SPI pin and timer pin of the processor for message parsing and monitoring the average transmission rate of the C1 signal; one C6 voltage signal is sent to the AD pin of the processor to monitor the amplitude of the C6 voltage signal; another C6 voltage signal is sent to the signal shaping circuit, and the square wave after shaping is input into the timer pin of the processor to monitor the frequency of the C6 signal. After the current mutual induction module collects the C interface current signal, the original waveform is input into the filtering module to separate the C1 current signal and the C6 current signal from the C interface signal. After the C1 current signal and the C6 current signal are processed by the processing circuit, they are respectively input into the AD pin of the processor to monitor the amplitude of the C1 current signal and the amplitude of the C6 current signal. The processor calculates the load impedance of the C1 signal through the C1 voltage signal and the C1 current signal, and calculates the load impedance of the C6 signal through the C6 voltage signal and the C6 current signal. The processor establishes communication with the communication unit through the communication module. The device ID identification method includes but is not limited to a read-only unique ID and a configurable ID. It should be emphasized here that the AD pin here can also be replaced by an AD chip, and this modification is still within the scope of protection of the present invention.

[0032] Example 3: Communication unit design

[0033] The communication unit mainly realizes the conversion of CAN bus or 485 bus into Ethernet bus. The communication unit consists of a processor, RAM, PHY circuit, CAN transceiver, RS485 transceiver, and power conversion module. After the CAN bus signal enters the communication unit, it is processed by the PHY circuit and then enters the processor; after the RS485 bus signal enters the communication unit, it is processed by the CAN transceiver and then enters the processor; after the Ethernet bus signal enters the communication unit, it is processed by the PHY circuit and then enters the processor; after the power enters the communication unit, it is processed by the power conversion module and then powers each chip of the communication unit; the communication unit is also equipped with a RAM chip and has data caching capabilities. The data processing flow of the communication unit is as follows: after the CAN interface or RS485 interface data comes in, the processor unpacks it, and then caches the data in the RAM, and then the processor encapsulates the data into a network packet and sends the data through the network port.

[0034] The beneficial effect of the solution of the present invention is that a set of expandable LEU C-interface real-time monitoring system is designed, which can be flexibly matched and combined according to the on-site installation and deployment conditions to achieve real-time monitoring of LEU, record the status of the C-interface during the operation of the LEU equipment, and monitor its status changes in real time. When equipment abnormalities are detected, a fault alarm can be immediately issued, and fault location and fault repair suggestions can be given, thereby improving the timeliness of fault discovery and reducing fault handling time.

[0035] The above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An expandable C-interface real-time monitoring system, characterized in that: The real-time monitoring system includes a monitoring device, a communication unit, a monitoring server and a data terminal. The monitoring device uses high-resistance parallel connection and current mutual induction to collect LEU C interface signals, reducing the impact on LEU C interface signals, and will not affect the existing working state after being connected to the transponder transmission system; The monitoring device has the capability of multi-channel simultaneous monitoring: one monitoring device corresponds to one LEU, and a single monitoring device can monitor four C-interface channels of the LEU simultaneously, and can configure channels according to the number of active transponders connected to the LEU, disabling unused channels; The monitoring device has cascade expansion capability: one LEU cabinet can be deployed with multiple LEUs during actual deployment; the monitoring device uses the same power supply and communication unit during installation and deployment, and the power interface and communication interface of the monitoring device support cascade connection. When adding a LEU, only one monitoring device needs to be added behind the existing monitoring device; The communication unit converts the CAN bus or RS485 bus into an Ethernet bus, that is, the communication unit realizes the conversion between the CAN bus and the Ethernet bus, so that the real-time monitoring system can connect multiple LEU cabinets and connect devices between different sites; A plurality of the communication units can be connected to the Ethernet network to realize data access to the monitoring server. The monitoring server software supports high-concurrency operations and can support access to a plurality of the monitoring devices.

2. The real-time monitoring system according to claim 1, characterized in that: The monitoring server consists of four submodules: status monitoring, fault diagnosis and prediction, maintenance suggestions, and data storage. After the data of the monitoring device enters the monitoring server, it first enters the status monitoring module, and the status monitoring module first calls the data storage interface to store the data, and then calls the message push interface to push the data to the data terminal; The fault diagnosis and prediction module is a data analysis task running in the background of the monitoring server, which is divided into a fault diagnosis task and a fault prediction task; Fault diagnosis task: when new data comes in, the fault diagnosis task makes a judgment according to the judgment criteria of each signal indicator; Fault prediction task: the task runs regularly in the background, analyzes the LEU operation data, integrates historical data, predicts the performance change trend of the equipment, and issues a warning message when it is found that the equipment performance has deteriorated; the results of fault diagnosis and fault prediction are pushed to the data terminal and stored at the same time; Maintenance suggestion module: the monitoring server imports the fault cause analyzed by the fault diagnosis and prediction module into the maintenance suggestion module, and the maintenance suggestion module outputs the corresponding fault maintenance suggestion.

3. The real-time monitoring system according to claim 1, characterized in that: The data terminal is used to display the working status of the monitored equipment in real time, query historical records, receive warning information, and monitor the connection status of each of the monitoring equipment; The data terminal can display the working status information of the LEU C interface in real time, can receive fault information, warning information, and fault repair suggestion information from the monitoring server, and can query the historical data information of each LEU.

4. The real-time monitoring system according to claim 1, wherein the monitoring device collects LEU C interface signals, including C1 voltage, C1 current, C1 impedance, C1 transmission rate, message, C6 voltage, C6 current, C6 impedance, C6 frequency, and C4 voltage. The monitoring device packages the collected signal information and sends it to the communication unit.

5. The real-time monitoring system according to claim 1, wherein the monitoring device comprises a high-resistance parallel connection module, a current mutual inductance module, a filtering module, a signal shaping circuit, a DBPL demodulation circuit, a device ID identification circuit, a processor and a communication module; After the high-impedance parallel connection module collects the C interface voltage signal, the original waveform is input into the filtering module to separate the C1 voltage signal and the C6 voltage signal in the C interface signal, and one C1 voltage signal is sent to the AD pin of the processor to monitor the amplitude of the C1 voltage signal; another C1 voltage signal is sent to the DBPL demodulation circuit, and its baseband code element signal and clock signal are obtained through the demodulation circuit, and are respectively input into the SPI pin and timer pin of the processor for message parsing and monitoring the average transmission rate of the C1 signal; one C6 voltage signal is sent to the AD pin of the processor to monitor the amplitude of the C6 voltage signal; another C6 voltage signal is sent to the signal shaping circuit, and the shaped square wave is input into the timer pin of the processor to monitor the frequency of the C6 signal. After the current mutual induction module collects the C interface current signal, the original waveform is input into the filtering module to separate the C1 current signal and the C6 current signal from the C interface signal. The C1 current signal and the C6 current signal are respectively input into the AD pin of the processor after passing through the processing circuit to monitor the amplitude of the C1 current signal and the amplitude of the C6 current signal; the processor calculates the load impedance of the C1 signal through the C1 voltage signal and the C1 current signal, and calculates the load impedance of the C6 signal through the C6 voltage signal and the C6 current signal; the processor establishes communication with the communication unit through the communication module.

6. The real-time monitoring system according to claim 1, wherein the communication unit is composed of a processor, a RAM, a PHY circuit, a CAN transceiver, an RS485 transceiver, and a power conversion module; after the CAN bus signal enters the communication unit, it is processed by the PHY circuit and then enters the processor; after the RS485 bus signal enters the communication unit, it is processed by the CAN transceiver and then enters the processor; after the Ethernet bus signal enters the communication unit, it is processed by the PHY circuit and then enters the processor; after the power enters the communication unit, it is processed by the power conversion module and then supplies power to each chip of the communication unit; the communication unit is also equipped with a RAM chip and has data caching capability; The data processing flow of the communication unit is as follows: after the CAN interface or RS485 interface data comes in, the processor unpacks it and then caches the data in RAM. The processor then encapsulates the data into a network packet and sends the data through the network port.

7. The real-time monitoring system according to claim 1, wherein the monitoring server records and analyzes the historical data of the LEU C interface, can draw the performance change trend of the LEU C interface, and give warning information according to its change trend; The monitoring server has the function of further analyzing the monitoring data. By analyzing the monitoring data, the following abnormal information can be analyzed: LEU no output, LEU output abnormality, LEU C6 output abnormality, LEU C1 output abnormality, LEU message abnormality, transmission cable open circuit, transmission cable short circuit, transponder failure, etc. The monitoring server can analyze the cause of the C-interface failure, locate the failure, and provide fault repair suggestions.

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