Train Overspeed Protection Using Dynamic Deceleration Segmentation
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Solution Overview
Problem
Current train overspeed protection methods inaccurately calculate emergency braking speeds due to the train's mechanical characteristics, leading to reduced safety and efficiency, and increased intervals between trains.
Innovation Solution
A method and apparatus that acquire initial and current speed limit values, determine decelerations, and select a target speed limit location point to calculate an accurate emergency braking speed, improving the accuracy and efficiency of overspeed protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If segmented calculation with kinetic energy equation is used to judge train overspeed, then the calculation process is simplified, but the calculation accuracy deteriorates due to train's mechanical and physical characteristics causing deviation from desired deceleration motion
Solution Approach 1:
The track is divided into multiple speed limit segments with different speed limits. For each segment, the system calculates the emergency braking speed by segmenting the deceleration process into uniform deceleration phase and limited deceleration phase, allowing accurate calculation while maintaining manageable computational complexity
Solution Approach 2:
The patent introduces dynamic parameters including actual deceleration rate, uniform deceleration rate, and limited deceleration rate that adapt to the train's real-time mechanical characteristics. The calculation dynamically adjusts based on current speed, position, and deceleration capabilities rather than using static segmented calculation
2Reliability
If the running interval between trains is increased to ensure safety, then train safety is improved, but train productivity deteriorates due to reduced operational efficiency
Solution Approach 1:
The system continuously monitors train speed, position, and deceleration characteristics, providing real-time feedback to calculate precise emergency braking speeds. This allows dynamic adjustment of safety margins based on actual train performance rather than using fixed conservative intervals, maintaining safety while optimizing productivity
Solution Approach 2:
The patent changes the calculation parameters from static segmented values to dynamic parameters including actual deceleration rate, uniform deceleration rate, and limited deceleration rate. This allows the system to adapt safety calculations to real-time conditions, reducing unnecessary safety margins and improving operational efficiency
3Adaptability or versatility
If segmented calculation method is used, then the calculation cycle is extended, but the system can cover more speed limit segments
Solution Approach 1:
The system pre-calculates and stores speed limit information for multiple segments along the track. When emergency braking is triggered, the system quickly retrieves relevant pre-stored data and performs focused calculation on the current and relevant segments, reducing real-time calculation cycle while maintaining comprehensive coverage
Solution Approach 2:
The patent extracts only the necessary speed limit segment information relevant to the current train position and emergency braking scenario, rather than processing all segments. This selective extraction reduces calculation cycle time while maintaining adaptability to cover all necessary speed limit segments
Data Source
AI summary
A train overspeed protection method includes: acquiring, when emergency braking is triggered for a train, an initial speed limit location point of each speed limit region among a preset number of speed limit regions, and a first speed limit value corresponding to each initial speed limit location point so as to obtain a plurality of first speed limit values; acquiring a current traveling location point of the train and a corresponding second speed limit value, and acquiring a current traveling speed of the train; determining a plurality of decelerations of the current traveling speed relative to each first speed limit value, selecting a deceleration satisfying a preset condition from the plurality of decelerations, and determining the initial speed limit location point corresponding to the deceleration satisfying the preset condition as a target speed limit location point; determining an emergency braking speed according to a relative deceleration of the second speed limit value relative to the first speed limit value corresponding to the target speed limit location point, and performing overspeed protection on the train according to the emergency braking speed.