Main control hot backup method of subway car broadcasting system

Abstract

The invention relates to a master control hot standby method for a subway on-board broadcasting system. The method comprises a master-slave switching method and a master-slave working method. The master-slave switching method comprises the following steps: preference rules are preset; and according to a set threshold time, each controller makes judgments on status change conditions and decides whether to change a working mode or not according to the preference rules. The master-slave working method comprises the following steps: a controller in a master working mode schedules a train control bus and / or an internal bus to send roll calling data frames, control data frames and self-status data frames; a controller in a slave working mode achieves data synchronization through the control data frames; and the controller in the slave working mode or a carriage controller, on which roll calling is carried out, sends self-status data frames as response frames to respond to the controller in the master working mode. The method provided by the invention has the advantages that automatic switching between the working modes can be achieved, so that the automation level of the system is improved; and the data synchronization between the two controllers can be achieved, so that the problem of broadcast information misreporting of the controllers after the switching is avoided.

Description

technical field [0001] The invention relates to a method for hot backup of two controllers applied to a subway vehicle-mounted broadcasting system. Background technique [0002] The topology structure of the subway car broadcasting system on the subway train is as follows figure 1 As shown, the front and the rear of the subway train each have a driver's cab, and each cab has a set of broadcast control hosts, that is, the controller of the subway car broadcast system. The controller is responsible for the station announcement voice and emergency broadcast of the broadcast system. , special broadcast control and site content update on the dynamic map screen, and notification update on the content displayed on the LCD screen. The main external interface of each controller is the A interface connected with the train control bus of the subway train (often using RS485 bus, current loop or MVB), and the A interface connected with the internal bus of the broadcasting system (CAN bu...

AI Technical Summary

Problems solved by technology

In the existing technology, the working mode of the controller is often switched manually, which increases the workload of relevant personnel and cannot be switched in time according to the system status

At the same time, the information of the two controllers is often not synchronized, which makes it prone to abnormalities such as broadcast information misreporting after switching the working mode

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