Dual-primary-system protection method for rail transit signal system

Abstract

The invention relates to a dual-primary-system protection method for a rail transit signal system. The invention provides a signal control system. The signal control system comprises a plurality of subsystems forming hot backup redundancy and at least two communication lines which enable each of the plurality of subsystems to be interconnected in a communication mode, wherein the plurality of subsystems are configured to implement the dual-primary-system protection method. The dual-primary-system protection method comprises the steps that one of the plurality of subsystems is determined to be a primary subsystem, and the rest of the subsystems are determined to be backup subsystems; each subsystem sends state information thereof to the other subsystems on each communication line within a software cycle; the backup subsystems respectively judge whether the primary subsystem stays at an expected state or not based on the state information of each communication line; and the backup subsystem is upgraded into the primary subsystem in response that the primary subsystem is judged to stay at a non-expected state based on each communication line.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a dual-master protection method for a hot standby redundant system. Background technique [0002] At present, in the field of rail transit signal systems, the control system often uses the method of dual-machine hot backup to improve reliability, that is, two sets of equipment are used for hot backup redundancy. After one set of equipment fails, switch to another set of equipment to continue operation. The dual-computer hot standby system mainly includes two series of control equipment with the same function and performance (such as figure 1 A system and B system in the system), communication lines and decision-making mechanism, its functional block diagram is as follows figure 1 shown. System A and System B constantly report their running status to the decision-making body. If the main system fails, the decision-making body will upgrade the backup system to the main system. ...

AI Technical Summary

Problems solved by technology

[0004] 1. The two machines compete for the control right of the system, resulting in confusion of the system output, wrong actions of external devices, and failure to work normally

[0005] 2. Both machines are the main system, which will easily lead to the downtime of both sets of equipment, the system has no output, and the external equipment is out of control

[0008] 1. The improvement of the active-standby switching software can only solve the dual-master problem caused by non-communication lines to a certain extent, and it is not enough to prevent the double-master problem caused by communication line failure;

[0009] 2. Detecting the health status will consume the communication cycle, which will increase the response time of the master-standby switchover and the response time of the system switchover;

[0010] 3. The design with decision-making mechanism will increase the cost

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