Railway Axle Rotation Monitoring for Residual Brake Pressure Release
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Solution Overview
Problem
Current railway braking systems, especially at high speeds above 200 km/h, face challenges in maintaining simplicity and integration while meeting standards for wheel rotation monitoring and anti-slip systems, leading to potential derailments and overheating due to inadequate braking force management during slipping phases.
Innovation Solution
The use of an electro-pneumatic valve with a Remote Release function is assigned to a Wheel Rotation Monitoring (WRM) device, ensuring physical and functional redundancy between the anti-slip and WRM systems, allowing for timely removal of braking force when the axle's linear speed falls below a threshold, thus preventing wheel locking and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-slip system with angular speed sensors and electro-pneumatic valves is used to detect and control wheel slipping, then the reliability of preventing wheel lock and overheating is improved, but the device complexity increases due to multiple sensors and control valves per axle
Solution Approach 1:
The electro-pneumatic valve with Remote Release function is designed to perform multiple functions: it acts as both an anti-slip control valve and a WRM device actuator. This multi-functional design allows a single valve to replace what would traditionally require separate components, thereby reducing overall system complexity while maintaining the reliability of wheel protection against lock and overheating
Solution Approach 2:
The patent merges the anti-slip system and the Wheel Rotation Monitoring (WRM) system into a unified configuration. The electro-pneumatic valve serves both systems simultaneously, integrating the detection and control functions into a single coordinated mechanism rather than separate independent systems
2Reliability
If a Wheel Rotation Monitoring (WRM) device is added to meet EN15595 standards for high-speed operation, then the safety and compliance are improved, but the device complexity and integration difficulty increase
Solution Approach 1:
The electro-pneumatic valve is designed with dual functionality to serve both the anti-slip control system and the WRM device. By making the valve multi-functional, the patent avoids adding separate dedicated components for WRM, thus meeting EN15595 safety standards while minimizing the increase in system complexity and integration difficulty
Solution Approach 2:
The valve is pre-configured with the Remote Release function that can be activated by the WRM device. This preliminary setup ensures that when high-speed operation requires WRM compliance, the system is already prepared with the necessary functional capability, reducing the need for additional complex integration work
3Loss of time
If the Remote Release function is activated to remove braking force when axle speed falls below threshold, then the response time for preventing wheel lock is improved, but the risk of continuous unwanted braking increases if not properly controlled
Solution Approach 1:
The system incorporates feedback mechanisms where the WRM device continuously monitors axle speed and provides feedback to the electro-pneumatic valve. When the axle speed falls below the threshold, the feedback triggers the Remote Release function to remove braking force. This closed-loop feedback ensures timely response while preventing continuous unwanted braking by constantly monitoring and adjusting based on actual axle speed conditions
Solution Approach 2:
The Remote Release function is designed to apply preliminary anti-action by removing braking force before wheel lock or continuous unwanted braking can occur. The system proactively counteracts the harmful braking force when speed threshold is breached, preventing the development of more severe harmful effects such as wheel lock or sustained unwanted braking
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 solution effectively meets EN15595 standards for high-speed railway braking systems without compromising simplicity or integration, ensuring safe operation by promptly reducing braking force and preventing wheel locking or continuous unwanted braking, thereby reducing the risk of derailment and overheating.
Implementation Method 1
an electro-pneumatic valve with a Remote Release function is assigned to a Wheel Rotation Monitoring (WRM) device, ensuring physical and functional redundancy between the anti-slip and WRM systems, allowing for timely removal of braking force when the axle's linear speed falls below a threshold
Data Source
AI summary
A rotational monitoring system of at least one axle designed to identify at least one axle controlled by it having an estimated instantaneous linear speed lower than a predetermined instantaneous linear limit speed, and remove the braking force to one or more wheels of the axle identified to have an estimated instantaneous linear speed lower than the predetermined instantaneous linear limit speed, by canceling a pressure to brake cylinders associated with the at least one axle identified to have an estimated instantaneous linear speed lower than the predetermined instantaneous linear limit speed. The cancellation of a pressure is obtained by acting on an electro-pneumatic valve designed to perform a Remote Release function associated with the pneumatic circuits generating braking pressure for the brake cylinders and adapted to cancel a residual braking pressure.