Train Control Packet Alternation for Seamless Redundancy Switching
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Solution Overview
Problem
The existing train information management systems face a time lag in switching from a primary central device to a secondary central device during failures, leading to increased traffic on trunk transmission lines when monitoring for redundancy, which can delay train control information transmission.
Innovation Solution
A train information management apparatus that alternately transmits train control information packets with sequence numbers on dual trunk transmission lines, allowing seamless switching without the need for additional monitoring lines and reducing traffic on existing lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first system central device and the second system central device monitor their respective soundness using an existing transmission line, then the reliability of switching is improved, but the traffic of the transmission line increases
Solution Approach 1:
The patent applies preliminary action by having the second system central device generate train control information in advance and hold it in a buffer before it is actually needed. This preparation is done proactively rather than reactively, so when switching is required, the pre-generated information can be transmitted immediately without waiting for generation, thus eliminating time lag while avoiding the need for continuous monitoring traffic on the transmission line.
Solution Approach 2:
The patent extracts the monitoring function from the transmission line by having the second system central device autonomously generate and buffer train control information without needing to continuously monitor the first system central device through the transmission line. This separation removes the need for additional monitoring traffic on the existing transmission line while maintaining switching reliability.
2Stability of the object's composition
If the second system central device waits for timeout before switching to transmit data, then the system stability is improved, but the switching speed deteriorates
Solution Approach 1:
The patent applies preliminary action by having the second system central device generate and buffer train control information in advance, before any failure occurs. This way, when switching is triggered, the device can immediately transmit the pre-generated information without waiting for timeout periods or delaying for information generation, achieving both rapid switching and system stability.
Solution Approach 2:
The patent implements dynamics by creating a hybrid transmission mode where the second system central device can switch between standby mode (generating information in advance) and active transmission mode (immediately sending buffered information). This dynamic approach allows the system to maintain stability during normal operation while achieving rapid response when switching is required, eliminating the fixed timeout delay.
3Loss of time
If a new transmission line is added for monitoring soundness, then the switching response time is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the soundness monitoring function from the transmission line infrastructure by having the second system central device autonomously generate and buffer train control information without needing continuous monitoring through a separate transmission line. This removes the need for additional transmission lines while achieving rapid switching response.
Solution Approach 2:
The patent applies self-service by enabling the second system central device to autonomously generate, buffer, and transmit train control information without external monitoring or control. The device serves itself by proactively preparing information and independently executing transmission when needed, eliminating the need for additional monitoring infrastructure and reducing overall system complexity.
Data Source
AI summary
A train information management apparatus includes a first system central device that generates first train control information for a car-mounted device in every predetermined period and a second system central device that generates second train control information starting from the time at which the time obtained by multiplying the predetermined period with 1/2 has elapsed from the time point when the first train control information is transmitted. The first system central device generates a first packet every time the first train control information is generated and alternately transmits a first packet to a first system trunk transmission line and a second system trunk transmission line. The second system central device generates and transmits a second packet almost in the same manner except that the second packet is transmitted to a trunk transmission line on the opposite side of the trunk transmission line to which the first packet was transmitted.