Train Control Apparatus Managing Temporary Speed Limit Transmission
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Solution Overview
Problem
Existing train control systems are limited in transmitting speed limit information for multiple temporary speed limit sections, leading to potential speed limit exceedance when not all sections are received by the train.
Innovation Solution
A train control apparatus that generates and transmits temporary speed limit information for a specified number of sections ahead, adjusting speed limits based on adjacent sections not included in the initial transmission to prevent exceedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the ground apparatus transmits temporary speed limit information for multiple temporary speed limit sections, then the train can receive more speed limit information, but the number of sections that can be transmitted in a single transmission is limited, causing some sections to be omitted
Solution Approach 1:
The control unit performs preliminary action by proactively lowering the speed limit in currently transmitted temporary speed limit sections based on the speed limit value in the next temporary speed limit section that will be transmitted later. This advance preparation ensures the train can decelerate in time even when the next section's speed limit is not yet known, preventing speed limit exceedance in omitted sections.
2Reliability
If the ground apparatus transmits temporary speed limit information for all temporary speed limit sections, then complete speed limit information is provided, but the transmission capacity is exceeded and not all sections can be included in a single transmission
Solution Approach 1:
The control unit changes the speed limit parameter in the temporary speed limit information by lowering it proactively. Instead of transmitting all section information (which exceeds capacity), the system modifies the speed limit value in the transmitted sections to account for upcoming lower speed limits in omitted sections, ensuring safety within the transmission capacity constraints.
3Ease of operation
If the train receives temporary speed limit information for nearby sections only, then transmission is feasible, but the train cannot decelerate in time for distant low-speed limit sections
Solution Approach 1:
The control unit performs preliminary deceleration preparation by lowering the speed limit in currently transmitted temporary speed limit sections based on anticipated lower speed limits in future sections. This creates a gradual speed reduction profile that allows the train to decelerate progressively and arrive at distant low-speed limit sections on time, maintaining reliability while preserving transmission feasibility.
Data Source
AI summary
A train control apparatus includes a setting reception unit that receives setting information regarding a temporary speed limit section and a speed limit. A control unit generates temporary speed limit information for the trains. A communication unit transmits the temporary speed limit information to the trains. If information regarding all temporary speed limit sections cannot be included in the temporary speed limit information, the control unit includes, in the temporary speed limit information, information regarding a specified number of temporary speed limit sections located on a traveling direction side, and changes a speed limit in one or more temporary speed limit sections included in the temporary speed limit information on the basis of a speed limit set in a temporary speed limit section that is adjacent to a temporary speed limit section included in the temporary speed limit information, and is not included in the temporary speed limit information.