Adhesion Agent Dosing for Rail Braking
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Solution Overview
Problem
Existing methods for applying adhesion-increasing agents to rail vehicles are inefficient as they often result in uneven distribution due to displacement by braking and wind, leading to reduced effectiveness and increased economic and environmental impact when each wheel is equipped with its own dosing device.
Innovation Solution
A method involving a single dosing device for initial application and a second device for subsequent application based on measured adhesion values, ensuring targeted application only when necessary, with the second device positioned to optimize the adhesion effect, and adaptive dosing to maintain desired braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single metering device is used to apply adhesion-enhancing agent to the rail, then device complexity is reduced, but manufacturing precision of adhesion application deteriorates due to displacement by braking and wind
Solution Approach 1:
The patent divides the single metering device function into two separate devices: a first metering device for initial application and a second metering device for supplementary application. This segmentation allows each device to be optimized for its specific function, with the second device positioned to compensate for displacement effects and ensure uniform adhesion application across all wheels.
Solution Approach 2:
The control unit acts as an intermediary that monitors adhesion values and determines when the second metering device should activate. This intermediary system coordinates between the two metering devices, activating the second device only when adhesion values indicate insufficient grip, thereby ensuring precise and uniform adhesion application without unnecessary complexity.
2Reliability
If adhesion-enhancing agent is applied continuously to all wheels, then braking performance is maintained, but loss of substance increases due to unnecessary application
Solution Approach 1:
The system implements periodic monitoring of adhesion values and activates the second metering device only when adhesion drops below a threshold. This periodic action based on actual need ensures braking performance is maintained while avoiding continuous application that would waste material. The control unit creates a feedback loop that triggers supplementary application only when necessary.
Solution Approach 2:
The system uses the rail vehicle's own braking performance data (adhesion values) to determine when additional adhesion-enhancing agent is needed. This self-service approach allows the system to automatically adjust application based on actual performance requirements, eliminating the need for continuous application and reducing substance loss while maintaining reliability.
3Device complexity
If the second metering device is positioned behind the first metering device, then device complexity is simplified, but manufacturing precision of adhesion application deteriorates because the agent cannot effectively reach the wheel
Solution Approach 1:
Instead of positioning the second metering device behind the first (which would be the intuitive arrangement), the patent inverts the arrangement by placing the second device in front of the wheel, upstream of the first device's application point. This inverted positioning allows the second device to apply agent that is carried backward by the wheel rotation and airflow, ensuring effective adhesion enhancement at the wheel-rail contact point.
4Reliability
If adhesion-enhancing agent is applied in advance to all wheels, then reliability of braking is improved, but loss of time occurs due to unnecessary application on wheels with sufficient adhesion
Solution Approach 1:
The first metering device applies adhesion-enhancing agent in advance to the rail, creating a preliminary coating that provides baseline adhesion for all wheels. This preliminary action ensures that when wheels need braking, there is already some adhesion-enhancing agent present, improving reliability while avoiding the need for all wheels to receive full application amounts.
Solution Approach 2:
The system continuously monitors adhesion values from wheels and uses this feedback to determine when the second metering device should activate. This feedback mechanism allows the system to respond in real-time to actual adhesion needs, applying supplementary agent only when measurements indicate insufficient grip, thereby eliminating waste on wheels that already have sufficient adhesion while maintaining braking reliability.
Data Source
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AI summary
The invention relates to a method for applying an adhesion-promoting product (26) to a rail (2), comprising: applying the adhesion-promoting product (26) from a first dosing device (18), which is arranged on a rail vehicle (4) traveling on the rail (2) above the rail (2) and in front of a wheel (16) of the rail vehicle (4) traveling on the rail (2), when seen in the direction of travel (6) of the rail vehicle (4), measuring an adhesion value (24) of the wheel (16) on the rail (2), and spreading the adhesion-promoting product (26) from a second dosing device (18) arranged above the rail (2) when the adhesion value (24) falls below a defined threshold value.