Safety output method based on MVB communication

Abstract

The invention discloses a safety output method based on MVB communication. A mode with an external processor interface is selected, and when the interruption time of prime frames in MVB communication is larger than t1 or the interruption time of frames of ports of polled specific device addresses is larger than t2, a specific numerical value is written into an MVB communication register; if communication is normal, another specific numerical value is written into the MVB communication register. An external processor can judge whether MVB communication is normal according to the numerical values of the MVB communication register, and if communication is normal, an output unit is controlled through network input data; if communication is abnormal, the output unit is shut down immediately, and therefore the safety and controllability of a train are guaranteed. According to the method, all the prime frames and the frames of the polled specific device addresses are monitored, if an MVB bus control device fails sending the prime frames of the specific device addresses for some reason, corresponding devices will not receive the frames containing the specific device addresses, output will be stopped after a specific period of time, and therefore the safety and controllability of the devices are guaranteed.

Description

technical field [0001] The invention relates to the field of MVB communication, in particular to a safe output method based on MVB communication. Background technique [0002] At present, train communication network equipment based on TCN has been applied in large quantities in projects such as high-speed trains and urban rail. The TCN architecture defines 2 types of buses: the Multifunction Vehicle Bus (MVB) and the Stranded Train Bus (WTB). The MVB bus is used to connect the equipment inside the vehicle or the equipment between the vehicles in the fixed train set. It is characterized by rapid response, strong real-time performance and high reliability, and is widely used in the field of rail transit. [0003] The Multifunction Vehicle Bus (MVB) is a vehicle bus that connects standard equipment located in the same vehicle, or in different vehicles with fixed reconnection, to the train communication network. It has the advantages of fast response, strong real-time perform...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this method is that software processing will occupy additional resources of the external processor, and the interrupt processing and application response time will be very long, and the output unit will be in an uncontrollable state for a long time

And the MVB communication main frame interruption monitoring time is fixed inside the chip and cannot be randomly set

The MVB bus control device developed based on FPGA / CPLDA does not have the function of safety output protection after MVB communication interruption. If there is frame loss or communication abnormality in the MVB communication network, the MVB bus control device will still maintain the MVB communication data before the loss. In the control state, the output unit will maintain the output, which will cause the train to be in an unstable state, and there are great risks and hidden dangers

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