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.