Railway Interface Adapter for Hybrid Relay-Digital Interlocking
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Solution Overview
Problem
Existing railway installations with relay-based interlockings face high costs and complexity in modernization, requiring significant time and investment to transition to modern control technologies while maintaining operational train traffic.
Innovation Solution
A new interface adapter that connects conventional relay-based interlockings to track-side objects using a digital data communication link, allowing a step-by-step upgrade to a hybrid system combining relay-based and digital control technologies, utilizing a bidirectional digital communication interface and converters to facilitate communication between existing and new systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay-based interlocking is used to control track-side objects, then reliability and robustness are improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces an interface adapter as an intermediary device that connects the digital control system to the relay-based interlocking system. This adapter translates digital control signals into relay-compatible signals, allowing the modern digital system to control traditional relay infrastructure without directly replacing the relays, thus maintaining reliability while reducing overall system complexity
Solution Approach 2:
The patent replaces the mechanical relay-based control system with a digital control system for the interlocking logic, while using an interface adapter to bridge the digital and analog domains. This substitution reduces device complexity and modernizes the system while preserving the reliable relay-based control of track-side objects
2Productivity
If relay-based interlocking is upgraded to modern control technology, then productivity and cost-efficiency are improved, but reliability may deteriorate
Solution Approach 1:
The patent implements preliminary action by introducing an interface adapter that prepares the transition from relay-based to digital control. The adapter maintains compatibility with existing relay infrastructure while enabling digital control capabilities, allowing gradual modernization without abrupt system replacement that could compromise reliability
Solution Approach 2:
The interface adapter serves as a mediator between the digital control system and the relay-based interlocking, ensuring that safety-critical relay functions are preserved while enabling modern digital productivity improvements. The adapter translates and interfaces signals between the two systems, maintaining safety through the proven relay technology while achieving modernization goals
3Ease of manufacture
If a hybrid system with interface adapter is implemented, then ease of manufacture and installation are improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the control system into distinct functional modules: the digital interlocking system, the interface adapter, and the relay-based track-side object control. This modular segmentation allows each component to be manufactured and installed independently, simplifying the overall manufacturing and installation process despite the increased system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables cost-effective and minimally disruptive modernization of railway installations by allowing existing train traffic to continue with reduced interruptions, lowering installation costs and time, and ensuring safety and reliability through a sequential upgrade process.
Implementation Method 1
analog-to-digital converter coupled to the analog input and configured to generate a first digital signal representing the at least one of the analog input current or the analog input voltage
Implementation Method 2
digital-to-analog converter coupled to the analog output and configured to generate the at least one of the analog output current or the analog output voltage in response to a second digital signal
Data Source
AI summary
An interface adapter for controlling a track-side object of a railway installation includes an analog input from an external source and an analog output to drive an electromechanical relay circuit. A bidirectional digital communication interface communicates digital data including first digital data transmitted and second digital data received. An analog-to-digital converter coupled to the analog input is configured to generate a first digital signal representing the electrical input. A digital-to-analog converter coupled to the analog output is configured to generate the electrical output in response to a second digital signal. A power supply supplies electrical power to the digital-to-analog converter. A programmable logic control circuit includes a control program configured to produce the first digital data from the first digital signal, transmit the first digital data using the digital communication interface, process the second digital data, and produce the second digital signal in response to the second digital data.