MVB bus monitor

Abstract

The invention discloses an MVB bus monitor. The MVB bus monitor comprises a signal quality acquisition module, a signal reception / transmission module, a protocol analysis module, a data storage module, a USB transmission module and a network transmission module, wherein the signal quality acquisition module comprises a first transformer, a signal conditioning module, an ADC acquisition module and a first digital isolation module; the first transformer is connected with a DB9 interface and is used for acquiring wavelike voltage values on buses; the first transformer is connected with the ADC acquisition module through the signal conditioning module; the signal conditioning module is used for attenuating + / -5V transmitted by the first transformer to + / -2V through a differential attenuation operational amplifier and then transmitting + / -2V to the ADC acquisition module; the ADC acquisition module is connected with the first digital isolation module; and the first digital isolation module is used for voltages of peripheral circuits. The MVB bus monitor can be compatible with and automatically recognizing ESD, ESD+ and EMD bus mediums, does not initiatively send any data to MVB buses, and does not disturb the data transmission of the MVB buses.

Description

technical field [0001] The invention relates to the technical field of detection equipment, in particular to an MVB bus monitor. Background technique [0002] Multifunctional Vehicle Bus (MVB) is a technology that emerged to solve the communication problems of various electronic devices on the train. The data interaction of the on-board programmable electronic devices in the train compartment is all communicated through the MVB bus. If a train is compared to a person, the MVB bus is the central nervous system of a person, and all actions and instructions are transmitted through the MVB bus. [0003] The train communication network adopts a two-layer network topology structure, the upper layer is the WTB network structure, and the lower layer is the MVB network structure. From the analysis of the two-layer network topology structure, for applications such as debugging and fault detection of the network where the on-board equipment is located, generally only For MVB can be. ...

AI Technical Summary

Problems solved by technology

[0007] 2) Due to the monopoly of foreign companies on the key technologies of MVB, it has seriously hindered the independent research and development of MVB communication network products in China, and the introduction cycle of the whole machine is long and the price is unaffordable

[0008] 3) Domestic understanding and digestion of imported standards and technologies and secondary development are not enough, which is not conducive to the promotion and use of MVB communication network technology in domestic EMU trains or other fields, and is also not conducive to learning from experience to develop its own trains network products and develop own train network standards

[0009] 4) Domestic research on train communication network is less, and there is not much technology accumulation, but such technology requires high requirements and large investment, resulting in slow progress in domestic train communication network research

[0010] 5) Difficulties in product post-service, repair parts, upgrades, etc.

However, after the introduction of foreign train networks in China, considering issues such as train operation safety, the support for MVB products developed by domestic related companies is not enough, and there are not many opportunities to provide online operation on trains, which seriously restricts domestic MVB related products. development and application

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