Railway Safety Method Using Segmented Braking Curves
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Solution Overview
Problem
Current safety methods for vehicle sequencing in track networks do not optimize braking curves based on different types of train following points, leading to suboptimal headway management and potential safety hazards.
Innovation Solution
Assigning specific braking curves of the same type to different train following point types, allowing vehicles to activate appropriate braking curves based on the type of train following point, thereby enabling late braking and increasing overall headway in the track network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single braking curve type is used for all train following points, then the safety system is simple to operate, but the headway in the track network cannot be optimized
Solution Approach 1:
The patent segments the braking curve management by creating different braking curve types (e.g., SBD, EBD, SBI, EBI) that are specifically assigned to different train following point types (EOA, SL, etc.). This segmentation allows each braking curve to be optimized for its specific application context, enabling later braking points and improved headway while maintaining clear, type-specific rules that prevent system complexity from becoming unmanageable.
Solution Approach 2:
The patent applies local quality by tailoring specific braking curve characteristics to match the local requirements of different train following point types. Each braking curve type has specific parameters and characteristics that are locally optimized for its designated train following point type, allowing the system to achieve optimal braking performance at each location without requiring a completely complex global optimization system.
2Productivity
If braking curves are tailored to the worst case, then safety is ensured, but headway optimization is prevented
Solution Approach 1:
The patent changes the parameters of braking curves based on the specific train following point type and context. Instead of using a single worst-case braking curve for all situations, the system selects from multiple braking curve types with different parameters (SBD, EBD, SBI, EBI), each optimized for specific scenarios. This allows the system to use less conservative (later) braking curves when conditions permit, thereby optimizing headway while maintaining safety through context-appropriate parameter selection.
Solution Approach 2:
The patent introduces dynamics into the braking curve selection process, where the appropriate braking curve type is dynamically selected based on the specific train following point type and operational context. This dynamic selection allows the system to adapt to different situations, using more aggressive braking curves when safe and later braking curves when conditions allow, thereby optimizing headway while maintaining safety through context-aware adaptation.
3Productivity
If late braking is enabled, then headway is increased, but the risk of overshotting train following points increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-assigning appropriate braking curves to different train following point types before the actual braking maneuver. The system determines the correct braking curve type in advance based on the train following point type, ensuring that the selected curve will safely bring the vehicle to a stop at the appropriate location. This preliminary selection and validation process enables late braking to be implemented safely without overshotting risks.
Data Source
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AI summary
The invention relates to a safety method for a railway network (1), which is divided into section segments (G1, G2,...,Gq) by section elements (S1, S2,..., Sp) and can be traveled by vehicles (Z1, Z2,..., Zr). In order to optimize the vehicle sequence in the railway network, different train sequence point types (ZFT.I, ZFT.II) are specified and different braking curves (BKA.I, BKA.II) of the same braking curve type (A) are provided by the vehicles (Z1, Z2,..., Zr), wherein each of the different braking curves (BKA.I, BKA.II) of the same braking curve type (A) of the particular vehicle (Zm with m = 1 to r) is associated with one of the different train sequence point types (ZFT.I, ZFT.II).