Train Control Device Deceleration Ratio Calculator
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Solution Overview
Problem
Conventional train control systems face inaccuracies in stop-positioning due to variations in deceleration characteristics, particularly after electropneumatic switching, leading to potential underruns or extended stopping times, as they rely on stabilizing brake commands for deceleration adjustments, which can result in incorrect brake commands and decreased accuracy.
Innovation Solution
A train control device that includes a deceleration ratio calculator and an adjuster to immediately detect and adjust deceleration characteristics by calculating the deceleration ratio based on actual and modeled deceleration, using distinct methods for regeneration and air braking to ensure accurate brake commands and maintain stop-position accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the brake command is maintained for a certain period of time to stabilize deceleration, then the deceleration characteristic model can be adjusted, but the train speed decreases too much with respect to the remaining distance to target position, causing stop with underrun or extended stopping time
Solution Approach 1:
The system performs preliminary deceleration estimation immediately after brake command issuance, before the brake command is maintained for stabilization period. This allows the control system to predict future deceleration characteristics and adjust brake commands in advance, preventing excessive speed decrease and stop underrun while avoiding extended stopping time
Solution Approach 2:
The system continuously monitors actual train speed and position, compares it with predicted values based on deceleration characteristic model, and adjusts the brake command in real-time feedback loop. This ensures accurate stop positioning without requiring prolonged brake command maintenance, thereby reducing stopping time while maintaining precision
2Loss of time
If the brake command is relaxed upon detection of stop with underrun, then the train can reach target position, but it becomes impossible to maintain brake command for deceleration stabilization and model adjustment
Solution Approach 1:
The system performs preliminary deceleration estimation immediately after brake command issuance, before the brake command is maintained for stabilization period. This allows the control system to predict future deceleration characteristics and adjust brake commands in advance, preventing excessive speed decrease and stop underrun while avoiding extended stopping time
Solution Approach 2:
The system continuously monitors actual train speed and position, compares it with predicted values based on deceleration characteristic model, and adjusts the brake command in real-time feedback loop. This ensures accurate stop positioning without requiring prolonged brake command maintenance, thereby reducing stopping time while maintaining precision
3Reliability
If the brake command is maintained for deceleration stabilization, then the deceleration characteristic model can be adjusted, but the stop-position accuracy deteriorates due to incorrect brake commands
Solution Approach 1:
The system continuously monitors actual train speed and position, compares it with predicted values based on deceleration characteristic model, and adjusts the brake command in real-time feedback loop. This ensures accurate stop positioning without requiring prolonged brake command maintenance, thereby reducing stopping time while maintaining precision
Solution Approach 2:
The system dynamically adapts the deceleration characteristic model by continuously updating it based on real-time deceleration estimation and actual train behavior. This dynamic adaptation ensures the model remains reliable and accurate without requiring prolonged stabilization periods, thereby maintaining stop-position accuracy
Data Source
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AI summary
A train control device according to an embodiment includes storage, a detector, a deceleration ratio calculator, an adjuster, and a control command calculator. The storage stores deceleration information indicating deceleration of a train when a brake is applied in accordance with a brake command. The detector detects the speed of the train. The deceleration ratio calculator calculates a level of deceleration representing the difference between the deceleration indicated by the deceleration information and actual deceleration of the train, based on an amount of deceleration of the train detected by the detector in a predetermined time during the braking in accordance with the brake command, and a value obtained by integrating the deceleration indicated by the deceleration information corresponding to the brake command with respect to the predetermined time. The adjuster adjusts the deceleration information for use in calculating the brake command, according to the level of deceleration calculated by the deceleration ratio calculator. The control command calculator calculates the brake command for the train to control the train to stop at a target position, based on the deceleration information and the position and speed of the train.