Rail-Wheel Adhesion Control via Force Redistribution
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Solution Overview
Problem
Current solutions for controlling rail-wheel adhesion in railway vehicles are complex, costly, and limited in their ability to maintain grip across various conditions and zones, especially when faced with degraded adhesion due to factors like water or 'oily' pollution, leading to axle slippage and wear.
Innovation Solution
A method that redistributes the overall force applied to the vehicle's driving axles when adhesion deteriorates, allowing for automated and cost-effective maintenance of grip without speed or zone limitations, by adjusting the effort required from each axle based on the last known direction of travel and adhesion measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sandblasting is used to improve rail-wheel adhesion, then grip level is improved, but device complexity and maintenance cost increase
Solution Approach 1:
The invention extracts the adhesion improvement function from complex mechanical sandblasting systems and implements it through simple electronic force redistribution control. The control system detects adhesion degradation and automatically redistributes tractive effort among axles, eliminating the need for physical sand injection equipment while maintaining grip improvement.
Solution Approach 2:
The invention replaces the mechanical sandblasting system with an electronic control system that redistributes forces. Instead of using mechanical devices to inject sand between wheels and rails, the system uses electronic sensors and controllers to detect slippage and automatically adjust the distribution of tractive effort across multiple axles, substituting mechanical intervention with electronic control.
2Reliability
If sand reservoirs are used to improve adhesion, then grip is improved, but ease of operation deteriorates due to laborious management
Solution Approach 1:
The invention implements self-service by enabling the control system to automatically detect adhesion degradation and redistribute forces without human intervention. The system continuously monitors wheel slip conditions and autonomously adjusts tractive effort distribution, eliminating the need for operators to manually manage sand reservoirs or intervene in adhesion control operations.
Solution Approach 2:
The invention uses feedback mechanisms where sensors detect wheel slip conditions and adhesion levels, and this information is fed back to the control system which automatically adjusts force distribution. This closed-loop feedback control eliminates the need for manual monitoring and management of adhesion materials, as the system self-regulates based on real-time conditions.
3Reliability
If anti-skid devices are used to control axle slippage, then slippage is reduced, but device complexity increases and overall grip maintenance capability deteriorates
Solution Approach 1:
The invention segments the adhesion control function across multiple independent axles rather than using a single complex anti-skid device. Each axle is equipped with sensors and control capabilities to detect and report slippage conditions independently, allowing the system to manage adhesion degradation on each axle separately through force redistribution, simplifying the overall control architecture.
Solution Approach 2:
The invention creates a universal control system that handles multiple functions: detecting slippage, determining adhesion degradation, calculating force redistribution, and controlling multiple axles simultaneously. This multi-functional control system replaces specialized anti-skid devices with a single system that can adapt to various adhesion conditions across different axles and operating scenarios.
4Reliability
If more driving axles are used to distribute tractive effort, then adhesion is improved, but cost increases
Solution Approach 1:
The invention applies dynamics by enabling flexible, real-time redistribution of tractive effort among existing axles based on detected adhesion conditions. Rather than adding more axles to increase adhesion capacity, the system dynamically adjusts the distribution of forces across available axles, allowing any axle to take on increased load when others experience slippage, thereby maximizing the utilization of existing axle resources.
Data Source
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Figure 5a~5b
AI summary
The invention relates to a method (100) for controlling the rail-wheel adhesion of a railway vehicle comprising at least two driving axles, said method (100) comprising: - a step (102) for detecting degraded rail-wheel adhesion on at least one driving axle, referred to as degraded, of said railway vehicle; - a step (104-110) for redistribution of forces comprising: ▪ a reduction of the force applied to said at least one degraded driving axle; and ▪ an increase of the force applied to at least one of the other driving axles. The invention also relates to a system implementing such a method and a railway vehicle equipped with such a system.