Vehicle Control System for Derailment Prevention on Curved Tracks
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Solution Overview
Problem
Existing vehicle systems face challenges in maintaining safe travel on curved tracks due to high ratios of lateral forces to vertical forces, which increase the risk of derailment, particularly when route and vehicle parameters such as curvature, wheel defects, and tractive efforts are not effectively managed.
Innovation Solution
A vehicle control system that determines route and vehicle parameters to assess the lateral to vertical force ratio, using processors to adjust operations such as tractive effort, wheel creep, and friction modification to reduce the ratio below a designated threshold, thereby mitigating the risk of derailment by controlling the application of friction-modifying substances and redistributing tractive efforts across axles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle system maintains high tractive effort for efficient movement, then productivity is improved, but the lateral force to vertical force ratio increases causing derailment risk
Solution Approach 1:
The system dynamically adjusts operational parameters including tractive effort distribution across axles, wheel creep control, and friction modification application timing to maintain productivity while preventing excessive lateral forces on curved tracks
Solution Approach 2:
The control system continuously monitors route parameters (curvature, speed) and vehicle parameters (tractive effort, wheel-rail contact forces) to calculate the lateral-to-vertical force ratio, providing real-time feedback for adjusting operations to maintain safety thresholds
2Speed
If the vehicle system increases speed on curved sections, then productivity is improved, but the lateral forces exerted by wheels on rails increase causing wheel climb or rollover
Solution Approach 1:
The system applies friction-modifying substances to the rail surface before the vehicle reaches curved sections, and pre-adjusts tractive effort distribution and speed profiles in advance of curve entry to prevent excessive lateral forces before they occur
Solution Approach 2:
The control system dynamically adjusts speed and tractive effort in real-time based on actual curve parameters and force ratios, allowing optimal speed maintenance while preventing lateral force thresholds from being exceeded
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces the risk of derailment by adjusting operational parameters to maintain a safe force ratio, preventing wheel climb or rollover, and ensuring stable vehicle movement on curved sections of the track.
Implementation Method 1
The friction modification system is configured to controllably apply a friction-modifying substance to plural rail-wheel interfaces ahead of the wheels in a direction of travel of the locomotive
Data Source
AI summary
A system and method for controlling a vehicle system determine one or more of a route parameter of a route on which the vehicle system is moving or a vehicle parameter of the vehicle system. The system and method also determine whether a ratio of a lateral force exerted by one or more wheels of the vehicle system on the route to a vertical force exerted by the one or more wheels of the vehicle system on the route increases to a value exceeding a designated threshold as a result of the one or more route parameter of vehicle parameter that is determined. The ratio of the lateral force to the vertical force exerted by the one or more wheels of the vehicle system on the route is reduced to a value less than the designated threshold by changing an operation of the vehicle system.