Rail Vehicle Mark-Aligned Stopping With Closed-Loop Brake Control
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Solution Overview
Problem
Existing rail vehicle systems fail to achieve closed-loop control of braking systems and suffer from significant errors in precision during mark-aligned stopping, particularly in urban rail vehicles, due to reliance on experience-based distance estimation and non-real-time adjustment of braking force.
Innovation Solution
A method and apparatus for controlling mark-aligned stopping of rail vehicles that involves measuring a rail vehicle, which includes a mark-alignment control method and apparatus for controlling mark-aligned stopping of a rail vehicle, and a computer storage medium, by periodically measuring the linear velocity change of wheel pairs to calculate actual deceleration values, determining deceleration compensation amounts, and adjusting braking force accordingly to ensure precise alignment with platform doors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional braking with hybrid electric/air braking is used, then braking function is achieved, but closed-loop control is not achieved and positioning precision deteriorates
Solution Approach 1:
The patent implements closed-loop control by continuously measuring actual deceleration during braking and comparing it with theoretical deceleration values. The system calculates deceleration compensation amounts based on the difference between actual and theoretical deceleration, then adjusts braking force in real-time to achieve precise mark-aligned stopping, resolving the contradiction between achieving braking function and maintaining positioning precision.
2Ease of operation
If experience-based distance estimation is used to calculate deceleration, then braking control is simplified, but positioning accuracy deteriorates due to inevitable errors
Solution Approach 1:
The patent replaces experience-based estimation with actual measurement of deceleration during braking. By using sensors to measure wheel pair velocity changes and calculating actual deceleration values, the system substitutes subjective experience with objective measurement, thereby improving positioning accuracy while maintaining operational simplicity through automated calculation and adjustment.
3Device complexity
If braking force is not adjusted in real-time, then control system complexity is reduced, but positioning precision deteriorates
Solution Approach 1:
The patent implements real-time feedback control by continuously measuring actual deceleration, comparing it with theoretical values, and adjusting braking force accordingly. The system calculates deceleration compensation amounts based on the difference between actual and theoretical deceleration, then applies corrective braking force to achieve precise mark-aligned stopping, resolving the contradiction between system complexity and positioning precision.
Data Source
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AI summary
A method for control of mark-aligned stopping of a rail vehicle, the method comprising: judging whether a vehicle meets a state switching condition; if so, recording a linear velocity change amount (ΔV) of a wheel pair of the vehicle within a sampling period (ΔT), and calculating an actual deceleration value on the basis of the sampling period and the linear velocity change amount; determining a braking force compensation amount on the basis of the actual deceleration value and a theoretical deceleration value. The method increases the accuracy of mark-aligned stopping of a rail vehicle, achieving closed-loop control of a braking system.