Shulou(Shulou.com)06/03 Report--

Because MVB network adopts distributed network structure, each networking equipment is distributed in different electrical cabinets, even on different vehicles, and each networking equipment often comes from different suppliers, which brings great difficulty to the debugging and diagnosis of MVB network. At present, MVB network debugging and fault troubleshooting, mainly through the instrument to check the network communication waveforms and messages, rely on manual analysis, network quality assessment and fault location. Network assessment and troubleshooting work requires high technical requirements for operators, the evaluation results are not accurate, and the troubleshooting efficiency is low.

In view of the above situation, Beijing Runke General Technology Co., Ltd. successfully developed a MVB intelligent analysis tool-MVB intelligent diagnosis instrument, which realizes the functions of quantitative evaluation of train MVB network quality and automatic fault analysis and location. The design objectives of the product are:

?? Timely detection and early warning of possible failure before failure occurs

?? After the fault occurs, quickly analyze and locate the network fault

?? Accurately evaluate the current network status of the train before the completion of debugging and maintenance

The products can be used in the debugging and maintenance of MVB network during train debugging, operation and maintenance.

Application scenario

Quality Evaluation of MVB bus

Before the completion of train commissioning and maintenance, it is necessary to confirm whether the quality of the whole vehicle network meets the factory requirements. The debugging and maintenance personnel connect the MVB intelligent diagnosis instrument to the network, import the equipment matching software into the train topology table, and click to start the software diagnosis and analysis function. The software control equipment collects the bus message and waveform information, analyzes the bus and equipment error code and waveform parameters, judges the bus health status, detects whether there is a potential fault, and outputs the evaluation report.

MVB troubleshooting

The train reports the MVB network fault, and the maintenance personnel connect the MVB intelligent diagnosis instrument to the network, use the equipment matching software to import the train configuration information, and click to start the software diagnosis and analysis function. The software control equipment collects bus messages and waveform information, analyzes the status of each device in the network, and displays the network fault location information and possible fault causes in the form of charts.

Analysis of accidental faults in MVB

The train flash reports the MVB network fault, and the maintenance personnel connect the MVB intelligent diagnosis instrument to the network, use the equipment matching software to import the train configuration information, set the product start-up analysis conditions, and click to start the software occasional fault diagnosis and analysis function. According to the set analysis conditions, the equipment collects and stores bus fault messages and waveform information, analyzes the data by supporting host computer software, and shows the network fault location information and possible fault causes in the form of charts and charts.

Application case

Case 1: MVB network fault detection

In the debugging workshop of a factory, the on-site debugging personnel reported a fault on Road B of a car, and they were investigating the source of the fault by throwing the line. After connecting the MVB intelligent diagnosis instrument to the faulty train network, the debugging engineer imports the train configuration information and detects the problem of an equipment with a fault of thirteen cars after analyzing for dozens of seconds. The network returns to normal after replacing the failed device control board. The equipment test results are shown in the following figure:

Status of MVB network equipment for train in a workshop

MVB fault list of train in a workshop

Case 2: quality evaluation of MVB bus

There is an occasional communication failure of the traction system in a vehicle on the airport line of a certain city. Customers use MVB intelligent diagnostic instrument to access the head car for testing. By collecting the data and physical waveforms of train MVB communication, it is found that there is message loss in 4 vehicle traction (PCE) equipment and 1 vehicle event recorder (EVR) equipment. Among them, the bit error rate of PCE equipment is higher, between 2% and 3%, the bit error rate of EVR equipment is less than 1%. The equipment test results are shown in the following figure:

Status of MVB network equipment on an airport line

MVB fault list of an airport line

Product introduction

The MVB intelligent diagnosis instrument evaluates the communication quality of the MVB network by counting the error information of the MVB bus, analyzing the characteristic parameters of the network waveform and combining with the network topology. The equipment can be used to detect the fault location information of the train MVB network and analyze the possible causes of the fault. It can also be used to evaluate the health status of the train MVB network, analyze the network health index and detect potential network faults.

Function introduction

The basic features of the device are shown in the table below. MVB network supports monitoring analysis and retrieval analysis mode, while WTB only supports monitoring analysis mode. The related function of the equipment WTB is the optional function, which can be cut according to the need.

Equipment function

Top view of equipment

Interface parameters

Device interface

Equipment parameters

Equipment connection

The connection mode of the device is shown in the following figure, and the diagnostic equipment should be connected in series to the network:

?? MVB snooping analysis mode, after the equipment string is connected to the network, whether the device is powered on or not will not affect the train network communication.

?? MVB retrieval analysis mode. Disconnect the MVB network master device before using the device.

?? In WTB snooping analysis mode, two WTB cables need to be connected to the WTB network in series.

Device MVB network connection mode

Software use

The upper computer software of MVB intelligent diagnosis instrument adopts flat interface design, WYSIWYG, and the software is easy to operate and easy to use. The software supports three working modes: MVB network quality analysis, MVB network accidental fault analysis and WTB network quality analysis (optional function). In addition to the three working modes, the software also supports auxiliary functions such as the setting of health threshold parameters and the management of train network topology. The use of software functions is described as follows:

1. Three steps of user operation

?? Step1: device access to MVB/WTB network

?? Step2: select the analysis model (determine the train topology information)

?? Step3: select the working mode and start the analysis

After starting the analysis, the equipment automatically collects the bus data, analyzes the network status and fault information, and generates the network quality evaluation report.

MVB network quality analysis function

Graphical display of diagnostic results

List display of diagnostic results

two。 Support level 4 health assessment

?? Green: normal

?? Yellow: abnormal waveform index, device alarm

?? Orange: abnormal bit error rate index, equipment failure

?? Red: no response from the device Awhite B, serious failure of the equipment

Bus information analysis

Design and Port Information Analysis

3. Health threshold setting

The software supports the setting of the network health threshold, and the device diagnoses the network health status according to the set threshold.

Health threshold configuration interface

4. Train topology management

The software supports the function of train topology information management. The equipment can diagnose and locate the train fault according to the imported topology table.

Train Topology Management Interface

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