Research on Network Control System for Heavy Duty Trains Based on Laser + Ethernet

Trains traditionally transmit braking and mitigation commands through the air tube filling and exhausting method, which is easy to cause local large longitudinal impact. In order to meet the high-precision requirements of synchronous transmission of commands for heavy-duty trains with large groupings, this paper proposes a laser+industrial Ethernet network control system, which can meet the requirements of flexible train grouping and virtual connecting under the premise of ensuring synchronous transmission of commands for trains with large groupings. The system consists of central control unit, locomotive laser communication module, locomotive switch, mobile wireless communication terminal, security gateway, vehicle control unit, vehicle laser communication module, vehicle switch, etc. It is designed according to the three-layer architecture of vehicle-level network, train-level network and line-level network, which can realise the issuance of internal control commands and status monitoring of the train, the real-time communication of the virtual train, as well as the information cloud sharing of the train running on the same line. Train information cloud sharing. As verified by the semi-physical test bench, the total transmission delay is less than 1.5ms, which is 5000 times higher than the transmission rate of traditional air tube, and the technical index meets the requirement of synchronous execution of commands for heavy-duty trains.