ATP System Dynamic Speed Profile for Bumper Approach
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Solution Overview
Problem
Existing Automatic Train Protection (ATP) systems cannot allow guided vehicles to approach a track element, such as a bumper, closer than the predefined security distance without risking collision, especially in scenarios like civil work layouts where nominal safety conditions are compromised.
Innovation Solution
An ATP system with a control unit that determines a second speed profile allowing a guided vehicle to approach closer to a track element by defining a speed limit greater than the maximum authorized speed within a predefined approach distance, overriding the regular speed profile to prevent collision while ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ATP system enforces a predefined security distance from track elements, then collision prevention is ensured, but the guided vehicle cannot approach closer than this distance even when safety conditions are compromised
Solution Approach 1:
The patent implements dynamic speed profiles that adjust in real-time based on the guided vehicle's proximity to track elements. The system transitions from a static predefined security distance to a dynamic approach where speed limits are continuously updated based on calculated safe stopping distances, allowing the vehicle to approach closer when conditions permit
Solution Approach 2:
The system changes the parameter of speed limits dynamically based on position relative to track elements. By calculating safe stopping distances and adjusting speed profiles accordingly, the system allows the guided vehicle to exceed the traditional security distance while maintaining safety through parameter-based speed control
2Adaptability or versatility
If the ATP system allows the guided vehicle to approach closer than the predefined security distance, then operational flexibility is improved, but the risk of collision with track elements increases
Solution Approach 1:
The system continuously monitors the guided vehicle's position, speed, and distance to track elements, using this feedback to dynamically adjust speed profiles. This closed-loop control ensures that even when approaching closer than the predefined security distance, the vehicle maintains a safe stopping distance based on real-time conditions
Solution Approach 2:
The system performs preliminary calculations of safe stopping distances and determines appropriate speed limits before the guided vehicle reaches critical proximity to track elements. This advance preparation allows the vehicle to approach closer safely by ensuring braking can be initiated in time
3Loss of time
If a regular brake pattern is used to allow closer approach, then the guided vehicle can maintain higher speed for longer distance, but the stopping distance may be insufficient to prevent collision
Solution Approach 1:
The patent implements dynamic speed profiles that adjust braking characteristics in real-time based on the guided vehicle's proximity to track elements. The system transitions from a static regular brake pattern to a dynamic approach where deceleration rates and braking initiation points are continuously optimized based on calculated safe stopping distances
Data Source
Figure 1~2
AI summary
The present invention concerns an ATP system (1) and a method for controlling a guided vehicle (2) approaching a bumper (4), said ATP system (1) comprising: - a control unit (11) configured for controlling the guided vehicle speed according to a first speed profile (FSP), wherein the first speed profile (FSP) defines a maximum authorized speed for the guided vehicle (2) in function of its position compared to the position (B) of the bumper (4), the maximum authorized speed for positions of the guided vehicle (2) falling within a predefined security distance (DS) from the position (B) of the bumper (4) being zero; characterized in that - the control unit (11) is configured for automatically determining a second speed profile (SSP) for the guided vehicle (2), wherein the second speed profile (SSP) defines a speed limit for the guided vehicle (2) in function of its position compared to the position (B) of the bumper (4), wherein the second speed profile (SSP) prevails over the first speed profile (FSP) for triggering an emergency brake.