Rail Transit Interlocking System with Double 2-Vote-2 Architecture
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Solution Overview
Problem
The existing computer interlocking systems for rail transit face complexity in wiring and networking control, leading to increased difficulty in managing redundant systems and frequent switching between active and standby systems, which affects reliability and efficiency.
Innovation Solution
A computer interlocking system with a double 2-vote-2 architecture, featuring redundant sub-systems with main control, network, and communication and execution layers, allowing for centralized control and simplified wiring through a communication network, and a switching control method that performs 2-out-of-2 comparisons to determine active/standby switching conditions, reducing the calculation load on the main control module and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control bus and monitoring bus are arranged redundantly to ensure system reliability, then system reliability is improved, but wiring complexity increases
Solution Approach 1:
The patent merges the control bus and monitoring bus into a single Ethernet network infrastructure. Both the active and standby systems share the same physical network cables and switches, eliminating the need for separate redundant wiring while maintaining system reliability through logical redundancy at the protocol level.
Solution Approach 2:
The Ethernet network infrastructure is designed to serve multiple functions simultaneously - it carries both control commands and monitoring data for both active and standby systems. This multi-functional approach allows a single wiring system to replace what would traditionally require separate dedicated buses for each function.
2Reliability
If control bus is arranged redundantly to reduce switching frequency, then switching frequency is reduced, but networking control becomes difficult
Solution Approach 1:
The patent introduces an Ethernet switch as an intermediary device that manages communication between the active and standby systems and the external network. The switch handles packet routing, collision management, and data prioritization, making networking control straightforward through standard Ethernet protocols rather than requiring complex custom wiring management.
Data Source
AI summary
A computer interlocking system includes: a first sub-system and a second sub-system that have a same structure and function, where the first sub-system and the second sub-system form a double 2-vote-2 architecture, respectively including a main control layer, a network layer, and a communication and execution layer; the network layer being configured to construct a communication network of a sub-system in which the network layer is located; the main control layer and the communication and execution layer in the first sub-system being respectively connected to a communication network of the first sub-system; and the main control layer and the communication and execution layer in the second sub-system being respectively connected to a communication network of the second sub-system.