Vehicle-mounted signal control system

Abstract

The invention provides a vehicle-mounted signal control system. The vehicle-mounted signal control system includes an automatic operation system, an automatic protection system and a train-ground communication system; the automatic operation system is used for receiving information sent by the speed and distance measurement unit through a CAN FD bus, processing the received information, generatinga control command of a train, sending the control command to the communication system through the CAN FD bus, and controlling the train; The automatic protection system is used for receiving the information, sending the information to the communication system through a CAN FD bus, and monitoring the speed and position information of the train; And the train-ground communication system is used forcarrying out information interaction with the automatic operation system and / or the automatic protection system through a CAN FD bus. According to the vehicle-mounted signal control system provided by the invention, the network communication bandwidth is increased, and the transmission rate is increased.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a vehicle signal control system. Background technique [0002] For the control system of subway trains, there are collection and analysis systems for each module, which monitor the train equipment to ensure the safety of train vehicles. [0003] In the prior art, the CAN bus architecture is usually used for data transmission. However, according to the standard frame structure defined by the CAN specification ISO11898-2, a frame message can only transmit a maximum of 64 bits (8 bytes) In the best case, the bus load reaches about 70%, but if the message data is less than 8 bytes, the bus load may be smaller. CAN adopts an arbitration mechanism to determine the priority of CAN message transmission of different nodes. During the arbitration period, all nodes on the same bus must arrive within one bit time. On the other hand, electrical signals have a limited propagat...

AI Technical Summary

Problems solved by technology

This leads to the inability to further increase the baud rate of CAN

In addition, for the CANopen protocol based on CAN, the data field of a message is only 8 bytes, which is very expensive when the SDO segment is transmitted, and for the PDO service, the disadvantages are more obvious, and the data field is too small to complete A PDO service requires several CAN messages and needs to be synchronized

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