Per-Axle Tractive Material Dispensing for Locomotives
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Solution Overview
Problem
Current systems for controlling vehicle traction, such as locomotives, often result in excessive consumption of tractive materials due to uniform application across all wheels and axles, leading to unnecessary wastage and inefficient adhesion enhancement between wheels and rails, especially in varying rail conditions like snow or ice.
Innovation Solution
Implementing a method to control the application of tractive materials on a per-wheel or per-axle basis, using sensors and vehicle controllers to determine individual wheel and axle conditions, allowing for targeted dispensation of tractive materials only where needed, thereby reducing waste and optimizing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform application of tractive material is used across all wheels and axles, then adhesion enhancement is achieved, but excessive material consumption occurs
Solution Approach 1:
The patent divides the uniform application system into individual wheel or axle-level control units. Each wheel/axle has its own sensor and applicator controlled by the vehicle controller, allowing independent tractive material application based on local slip conditions detected by individual wheel speed sensors.
Solution Approach 2:
The patent implements local quality by applying tractive material selectively to specific wheels or axles based on their individual operating conditions. The vehicle controller receives wheel speed signals from individual sensors and activates only those applicators corresponding to wheels/axles experiencing slip, rather than applying material uniformly to all wheels.
2Reliability
If tractive material is dispensed for a set period of time, then adhesion is improved, but more material is dispensed than necessary
Solution Approach 1:
The patent implements feedback control by continuously monitoring wheel speed through individual wheel speed sensors and comparing actual wheel speed to expected wheel speed. The vehicle controller adjusts tractive material application in real-time based on this feedback, activating applicators only when slip is detected and deactivating them when slip resolves, rather than using fixed-duration dispensing.
3Loss of substance
If individual wheel or axle control is implemented, then material consumption is reduced, but system complexity increases
Solution Approach 1:
The patent applies universality by having the vehicle controller perform multiple functions: it receives wheel speed signals from individual sensors, processes slip detection logic, controls multiple applicators simultaneously or independently, and adjusts application timing for each wheel/axle. This consolidates control complexity into a single multi-functional controller rather than requiring separate control systems for each wheel.
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
This approach reduces tractive material consumption, improves adhesion efficiency, minimizes wear on wheels and tracks, and extends the duration of material reserves, while maintaining or enhancing traction performance.
Implementation Method 1
the agent is applied to an area of contact between a railway wheel and a railway rail over which the wheel is traversing to selectively modify the coefficient of friction at the contact area
Data Source
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AI summary
Various methods and systems are provided for automatically applying tractive material during operation of a vehicle. In one embodiment, the application of tractive material for a vehicle is adjusted based on calculated and expected tractive effort for each powered truck, axle, or wheel of the vehicle. In this way, tractive material application is controlled on a per truck, axle, or wheel basis in order to reduce excessive use of tractive material during operation of the vehicle.