Train Signal Output Readback for Pre-Operation Fault Detection
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Solution Overview
Problem
Conventional signal control devices for trains require significant time and effort to restore normal operation after detecting failures, and their complex configurations can lead to larger device sizes.
Innovation Solution
A signal control device with a readback circuit and controller that performs signal stop and output requests before train operation to detect abnormalities, allowing for early detection and prevention of malfunctioning without the need for multiple control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple control systems are used to detect abnormalities, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the output unit's signal is fed back to the controller through a readback circuit. The controller compares the output signal with the expected signal to detect abnormalities. This self-checking feedback loop provides reliable abnormality detection without requiring multiple independent control systems, thus resolving the contradiction between reliability and device complexity.
2Reliability
If multiple control systems are used to detect abnormalities, then reliability is improved, but the device size increases
Solution Approach 1:
The patent merges the abnormality detection function into the existing single control system by integrating a readback circuit that monitors the output signal. Instead of adding separate control systems, the detection capability is combined with the output unit through feedback connection. This merging approach maintains reliability while avoiding the increased device size that would result from multiple independent control systems.
3Reliability
If conventional abnormality detection is performed during operation, then safety is ensured, but loss of time increases due to train stoppage
Solution Approach 1:
The patent implements preliminary abnormality detection by continuously monitoring the output signal through the readback circuit before failures can cause safety issues or require train stoppage. The controller proactively compares output signals with expected values and detects abnormalities in real-time, allowing for early intervention and maintenance scheduling without interrupting train operations. This preliminary detection approach ensures safety while minimizing loss of time.
Data Source
AI summary
A RIO device mounted to a train includes an output unit that outputs a signal to a relay mounted to the train, and a controller that controls whether or not to cause the output unit to output the signal. The output unit includes a readback circuit that detects whether or not the signal is outputted from the output unit. The controller makes a signal stop request and a signal output request to the output unit before operation of the train starts, acquires a detection result of the readback circuit while each of the signal stop request and the signal output request is performed, and detects abnormality of the output unit using the detection result.