Train Braking Gradient Curve Correction for Sudden Slope Changes
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Solution Overview
Problem
Existing methods for calculating gradient values in locomotive traction trains fail to account for sudden gradient changes, leading to safety risks such as train overrunning restricted target points and abrupt 'sawtooth' changes in monitoring curves.
Innovation Solution
A method for calculating gradient curves by segmentally accumulating speed intervals, correcting initial effective braking curves, and determining intervention speeds to enhance safety and efficiency in train control models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the train-chain average gradient principle is used to calculate gradient values, then the calculation is simplified, but safety risks occur when gradient changes suddenly (train may overrun restricted target point or produce sawtooth abrupt changes in monitoring curve)
Solution Approach 1:
The patent segments the gradient calculation process into multiple stages: initial gradient calculation using train-chain average gradient principle, detection of sudden gradient changes, and corrective calculation when changes exceed thresholds. This segmentation allows the system to use simple average gradient calculation normally while activating safety checks only when needed, resolving the contradiction between calculation simplicity and operational safety.
Solution Approach 2:
The patent performs preliminary calculation of the initial effective braking curve using the simple train-chain average gradient principle, then prepares corrective measures in advance by detecting sudden gradient changes and applying correction algorithms before the train actually encounters the hazardous condition. This preliminary action ensures safety without continuously complicating the calculation process.
2Reliability
If correction algorithms are added to handle sudden gradient changes, then safety is improved, but calculation complexity increases
Solution Approach 1:
The patent implements a dynamic correction mechanism where the calculation complexity adapts to the actual operating conditions. The system starts with simple average gradient calculation and only activates complex correction algorithms when sudden gradient changes are detected. This dynamic approach ensures safety improvement while minimizing the increase in calculation complexity during normal operation.
Solution Approach 2:
The patent changes the gradient calculation parameters dynamically: using train-chain average gradient under normal conditions, and switching to corrected gradient values when sudden changes are detected. This parameter change approach allows the system to maintain simplicity during stable operation while ensuring safety when conditions change, avoiding continuous complexity increase.
Data Source
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AI summary
The present invention provides a method and system for calculating a gradient curve value of a traction train, belonging to the technical field of rail transit. The method includes: calculating an initial effective braking curve of the train by segmentally accumulating speed intervals; where a gradient value of the initial effective braking curve is calculated based on a train-chain average gradient principle; correcting the gradient value of the initial effective braking curve to obtain a first effective braking curve; calculating a braking intervention curve according to the first effective braking curve; and correcting the gradient value according to the braking intervention curve, and determining a gradient value adopted for calculating idling braking time within a calculation step. According to the present invention, scenarios such as an abrupt change in a line gradient are considered, and calculation of a gradient value of a monitoring mode curve for a locomotive traction train is corrected in accordance with principles of monitoring efficiency and safety. Train control efficiency is improved, thereby enhancing safety of a monitoring distance of an entire monitoring curve during train movement.