Rail Vehicle Braking Capacity Calculation Using Dynamic Sensor Data
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Solution Overview
Problem
Existing methods for determining braking capacity in rail vehicles often result in unrealistic and overly conservative values, leading to unnecessary operating restrictions that complicate economic operation.
Innovation Solution
A method that uses multiple measured values, including vehicle mass, air pressure, wheel diameter, and linkage efficiency, to calculate a more precise and realistic braking capacity value, allowing for dynamic adjustments in braking force distribution and speed management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking capacity values are determined based on worst possible operating state parameters, then safety reserves are guaranteed, but operating restrictions result that make vehicle operation more difficult economically
Solution Approach 1:
The braking capacity value is dynamically adjusted based on actual measured operating parameters (vehicle mass, wheel diameter, linkage efficiency, air pressure) rather than static worst-case assumptions. The control unit continuously updates the braking capacity value as conditions change, allowing the vehicle to operate at higher speeds when conditions permit while maintaining safety margins.
Solution Approach 2:
The invention changes the parameters used to determine braking capacity from fixed worst-case design parameters to variable measured parameters that reflect actual vehicle state. By measuring and using real-time data on vehicle mass, wheel diameter, linkage efficiency, and air pressure, the system adapts the braking capacity calculation to current conditions, eliminating unnecessary conservative limitations.
2Reliability
If braking capacity values are determined conservatively, then safety is ensured, but speed limitations are imposed that reduce economic operation
Solution Approach 1:
The system implements feedback by continuously measuring actual operating parameters (vehicle mass via air pressure, wheel diameter, linkage efficiency) and using these measurements to adjust the braking capacity value. This closed-loop approach ensures safety through real-time monitoring while allowing speed optimization based on actual vehicle condition rather than conservative assumptions.
Solution Approach 2:
The control unit pre-calculates the braking capacity value based on measured parameters before vehicle operation or route planning. By having the braking capacity value ready in advance based on actual vehicle state, the system can optimize speed profiles and routing decisions without imposing unnecessary limitations, while still guaranteeing safety through the measured-parameter-based calculation.
3Measurement precision
If multiple measured values are used to determine braking capacity, then precision and realism are improved, but measurement and calculation complexity increases
Solution Approach 1:
The invention uses existing multi-functional vehicle systems for measurements: the air suspension system serves both its primary function and vehicle mass measurement; the wheel rotation sensors serve both speed monitoring and wheel diameter measurement; the brake actuation system provides linkage efficiency data. By leveraging existing systems for multiple purposes, the invention achieves high measurement precision without proportionally increasing system complexity.
Data Source
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AI summary
A vehicle, in particular rail vehicle, having a braking capability-calculating facility and method for operating same. The invention relates, inter alia, to a method for operating a vehicle, in particular a rail vehicle (10), wherein a braking capability value (λ) which specifies the braking capability of the brakes of the vehicle is determined in the method. According to the invention there is provision that a failure state measured value (Gb) which specifies the respective current failure state of the brakes is determined, and the failure state measured value (Gb) and at least one further measured value, which specifies the state of the vehicle or the state of a vehicle component of the vehicle, are used in the calculation of the braking capability value (λ).