Since the MVB network using a distributed network architecture, each network equipment located in different electrical cabinets, even on different vehicles, each network device often from different vendors, which gives MVB network commissioning and diagnosis is a big difficulty. Currently MVB network debugging and troubleshooting, primarily through the instrument to view network traffic and packet waveforms, rely on manual analysis, network quality evaluation and fault location. Network evaluation and troubleshooting work technical requirements to the operator, inaccurate assessment results, the low efficiency of the investigation.
For the above, Beijing Branch of China General Technology Co., Ltd. successfully developed an intelligent analysis tool --MVB MVB intelligent diagnostic instrument, the product to achieve a quantitative assessment train MVB network quality analysis and fault location function automation. Product Design objectives are:
?? before a failure occurs, timely detection and warning failure may occur
?? after a failure, quickly locate network fault analysis
?? Before commissioning overhaul is complete, accurate assessment of the current state of the train network
Products can be applied to trains commissioning, operation, MVB network debugging maintenance aspects during maintenance.
Scenarios
MVB bus quality assessment
Complete overhaul before commissioning the train, you need to confirm whether the network quality in line with the vehicle manufacturer's specifications. Debugging maintenance personnel will MVB intelligent diagnostic access network, using equipment imported train topology table supporting software, click on Start the software diagnostic analysis. Software acquisition control device and the bus packet waveform information analysis device and the bus error, the waveform parameter, the health status determination bus, detect the presence of potential failure, outputs an evaluation report.
MVB Troubleshooting
Train newspaper MVB network failure, maintenance personnel will MVB intelligent diagnostic access network, using software to import equipment for train configuration information, click on Start the software diagnostic analysis. Software acquisition control device and the bus waveform information packet, each network device status analysis, in bound form chart showing a network fault location and possible cause of the fault.
MVB occasional failure analysis
News flash MVB train network failure, maintenance personnel will MVB intelligent diagnostic access network, using software to import equipment for train configuration information, set conditions for the product launch analysis, click Start software sporadic fault diagnosis analysis. The analysis condition setting apparatus, a memory bus acquisition failure message and waveform information, data were analyzed by the PC software package, in conjunction with chart form showing a network fault location and possible cause of the fault.
Applications
Case I: MVB network fault detection
Commissioning a factory workshop, site commissioning staff report reflects a B road vehicle malfunction, they are troubleshooting line source by way of rejection. The commissioning engineer MVB intelligent diagnostic fault after train network access, import train configuration information, after analyzing tens of seconds, a fault is detected for a device problems thirteen cars. After replacing a faulty device control panel, the network returned to normal. The apparatus shown in FIG detection results:
A shop that train MVB network device status
A shop that train MVB fault list
Case II: MVB bus quality assessment
Even the presence of a traction system of a communication failure message line of a vehicle in a city airports, customers using trucks MVB intelligent diagnostic test access, by collecting data and the physical communication MVB waveform train, traction vehicle analysis showed 4 (PCE) devices, and a vehicle event recorder (EVR) devices are present in the case of packet loss, wherein a higher error rate PCE device, between 2% to 3%, the error rate is less than 1% EVR apparatus. The apparatus shown in FIG detection results:
An airport line MVB network device status
MVB fault line of an airport list
product description
Intelligent Diagnosis MVB MVB bus through statistical error information, wherein the waveform analysis of network parameters, in conjunction with the network topology, network communications quality assessment MVB. Apparatus may be used to detect network fault MVB train location information, and analyze the possible causes of the failure, the train can also be used to assess the health status of the MVB, analysis of network health index, a network detection potential failures.
Features
Device basic functions in the table below, MVB network support analysis and retrieval analysis monitor mode, WTB analysis only supports listening mode. Related equipment WTB is an optional function, it can be tailored to needs.
Equipment features
A plan view of the device
Interface parameters
Device Interface
Device parameters
Device is connected
Devices connected as shown, be connected in series in the form of diagnostic device in an access network:
After analysis ?? MVB listening mode, the network access device string, the device is powered or not, does not affect the train communication network
?? MVB analysis retrieval mode, before the device is used, the network master should disconnect MVB
Analysis ?? WTB listening mode, the two cables are WTB WTB string access network.
MVB network connection device
Software
MVB intelligent diagnostic PC software uses the tiled interface design, WYSIWYG software is simple and easy to use. Software supports three operating modes selected, respectively MVB network quality analysis, incidental MVB network fault analysis, WTB network quality analysis (optional feature). In addition to the three operating modes, the software also supports the health threshold parameter settings, network topology train management and other auxiliary functions. Use software features are described below:
1.用户操作三步骤
?? Step1：设备接入MVB/WTB网络
?? Step2：选择分析车型（确定列车拓扑信息）
?? Step3：选择工作模式，启动分析
启动分析后，设备自动采集总线数据，并分析网络状态及故障信息，生成网络质量评估报告。
