Emergency Brake Extension Circuit for Synchronous Rail Braking
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Solution Overview
Problem
Existing emergency braking systems for urban rail vehicles face issues with asynchronous application of emergency braking between coupled vehicles, leading to equipment damage and potential pantograph and catenary system failures, especially when one vehicle's faulty control loop affects all connected vehicles.
Innovation Solution
An emergency braking extension device with a connected loop including a protective circuit breaker, diode, emergency braking extension relay, and pantograph lowering control loop, ensuring synchronous emergency braking application across vehicles and preventing damage by disconnecting faulty control loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emergency braking control loops of coupled vehicles are connected in series to form an extended control system, then uniform emergency braking control across all vehicles is achieved, but a failure in one vehicle's control loop causes the entire extended control system to fail and prevents emergency braking relief
Solution Approach 1:
The patent divides the emergency braking control system into independent vehicle-level control loops that can operate autonomously. Each vehicle maintains its own emergency braking control loop that is not dependent on other vehicles, allowing one vehicle to fail without affecting the emergency braking capability of other vehicles in the coupled formation.
Solution Approach 2:
The patent extracts the emergency braking control function from the extended control system and places it at the vehicle level. By removing the dependency on series-connected control loops across vehicles, each vehicle can independently execute emergency braking without being affected by failures in other vehicles' control loops.
2Adaptability or versatility
If non-extended control system is used where each vehicle maintains independent control, then vehicle independence is maintained, but emergency braking cannot be applied synchronously between coupled vehicles causing large pulling forces on couplers
Solution Approach 1:
The patent merges the emergency braking control functionality across coupled vehicles by establishing a control relationship where the emergency braking control loops are connected. This allows synchronous application of emergency braking across all vehicles while maintaining the ability to operate independently if needed, eliminating the asynchronous braking forces on couplers.
3Speed
If extended control system connects emergency braking control loops in series, then synchronous emergency braking is achieved, but a faulty vehicle's control loop failure prevents emergency braking relief for all coupled vehicles
Solution Approach 1:
The patent segments the control loop dependency so that each vehicle's emergency braking relief is independent. By allowing each vehicle to independently control its own emergency braking relief through its own control loop, a failure in one vehicle does not prevent other vehicles from relieving emergency braking, thus maintaining reliability while preserving rapid response capability.
Data Source
AI summary
An emergency braking extension device includes an emergency braking extension loop, a first emergency braking extension train line and a second emergency braking extension train line. The emergency braking extension loop has a protective circuit breaker, a normally open contact of an emergency braking button, and an emergency braking extension relay, which are sequentially connected in series. A normally open contact of the emergency braking extension relay is connected in series to a pantograph lowering control loop. A first normally closed contact and a second normally closed contact of the emergency braking extension relay are connected in series to a return line and a power supply negative loop of a train emergency braking control loop, respectively. A third normally closed contact of the emergency braking extension relay is connected in series to a control loop of a bypass cut-off circuit of a train emergency braking execution loop.