Train Deceleration Control via Dynamic Curve Selection
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Solution Overview
Problem
Existing train braking systems often overshoot target speeds due to inadequate deceleration curves or profiles, lacking advance warning for operators and resulting in potential safety issues.
Innovation Solution
An on-board train control system determines actual deceleration curves and adjusts braking by selecting alternative deceleration curves or profiles from a database, dynamically increasing braking effort as needed to ensure precise deceleration to target speed, incorporating factors like track conditions and environmental influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the train operator manually adjusts braking to avoid overshooting, then the train can reach the target location more accurately, but the complexity of operation increases and response time is delayed
Solution Approach 1:
The system enables self-service by automatically detecting actual deceleration curves and selecting appropriate target deceleration curves without operator intervention. The on-board train control system autonomously compares actual deceleration against stored curves and applies braking adjustments independently, eliminating the need for manual operator analysis and decision-making while maintaining high deceleration accuracy.
Solution Approach 2:
The system implements feedback by continuously monitoring actual deceleration curves during braking and comparing them against stored target deceleration curves. When the actual curve deviates from acceptable ranges (indicating potential overshooting), the system automatically adjusts braking force based on the feedback signal, creating a closed-loop control system that maintains precision without increasing operator workload.
2Device complexity
If the system uses a fixed target deceleration curve, then the braking system is simpler to implement, but the train may overshoot the target speed at the target location
Solution Approach 1:
The system applies dynamics by transitioning from a static fixed deceleration curve to a dynamic adaptive curve selection mechanism. The on-board control system dynamically selects the appropriate target deceleration curve from stored curves based on real-time conditions (track grade, curvature, speed, train composition) and continuously adjusts braking force during deceleration, enabling the system to adapt to varying conditions without excessive complexity.
Solution Approach 2:
The system implements parameter changes by modifying deceleration parameters (rate, timing, force distribution) based on stored track profiles and real-time conditions. The system stores multiple target deceleration curves with different parameters for various track conditions and selects/appropriately modifies the correct curve based on current parameters such as track grade, curvature, and train weight, thereby improving reliability without requiring complete system redesign.
3Manufacturing precision
If the system dynamically adjusts braking effort based on real-time data, then the train deceleration accuracy is improved, but the computational requirements and system complexity increase
Solution Approach 1:
The system applies preliminary action by pre-storing multiple target deceleration curves and track profiles in the on-board control system before the train reaches the braking zone. The system pre-calculates appropriate braking parameters based on stored track data and train characteristics, so that when real-time braking is required, the control system only needs to select from pre-prepared curves and make minor adjustments, significantly reducing real-time computational requirements while maintaining high precision.
Data Source
AI summary
In a method of train deceleration, a train computer: (a) causes brakes of the train to be set according to a target deceleration curve, profile, or braking model estimated to decelerate the train from a present speed at a present location to a target speed at a target location; (b) during deceleration of the train according to the target deceleration curve, profile, or braking model of step (a), determines an actual deceleration curve of the train; (c) in response to determining from the actual deceleration curve that the train will overshoot the target speed at the target location, determines another target deceleration curve, profile, or braking model estimated to decelerate the train to the target speed at the target location; and (d) causes the brakes of the train to be set according to the other target deceleration curve, profile or braking model of step (c).