Train Control Device Coasting Strategy for Arc Discharge
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Solution Overview
Problem
Existing train control systems face challenges in preventing loss of contact between current collectors and overhead contact lines, leading to power disruptions, discomfort, and potential damage from arc discharge.
Innovation Solution
A train control device with a position detector, storage, and in-vehicle controller that detects loss-of-contact positions and adjusts travel plans to include coasting sections, minimizing power disruptions and arc discharges by calculating optimal travel curves and issuing power and brake commands to maintain continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the train maintains continuous power supply through the loss-of-contact position, then power supply continuity is improved, but arc discharge and equipment damage risk increase
Solution Approach 1:
The system performs preliminary detection of loss-of-contact positions using position detectors and stores this information in advance. When approaching a known loss-of-contact position, the controller preemptively issues coasting commands to prevent contact loss before it occurs, thereby maintaining power supply continuity while avoiding arc discharge at the critical position.
Solution Approach 2:
The system applies preliminary anti-action by detecting loss-of-contact positions in advance and issuing coasting commands before the train reaches these positions. This preemptive measure counteracts the potential harm of arc discharge by ensuring the current collector is already in coasting mode (reduced current) before contact is lost, thus preventing harmful arcs while maintaining continuous operation.
2Object-affected harmful factors
If the train performs coasting traveling through the loss-of-contact position, then arc discharge is reduced, but power supply continuity may be disrupted
Solution Approach 1:
The system uses feedback from position detectors to continuously monitor the train's location relative to stored loss-of-contact positions. Based on this feedback, the controller dynamically adjusts the coasting command timing and duration, ensuring that coasting is maintained precisely through the loss-of-contact position while preparing to resume power mode immediately after, thus preventing both arc discharge and power disruption.
Solution Approach 2:
The system dynamically adjusts the coasting operation based on real-time position information. The controller modifies the coasting command duration and timing according to the train's actual position relative to the loss-of-contact position, enabling flexible adaptation that maintains power supply continuity while minimizing arc discharge through optimized dynamic control.
3Productivity
If the train speed is increased to reduce travel time, then productivity is improved, but loss of contact occurrence frequency increases
Solution Approach 1:
The system performs preliminary detection and storage of loss-of-contact positions, then uses this information to proactively issue coasting commands before the train reaches high-speed sections prone to contact loss. This allows the train to maintain higher speeds in safe zones while temporarily reducing speed or entering coasting mode only when necessary, thus improving overall productivity while preventing contact loss.
Solution Approach 2:
The system changes operational parameters (speed, coasting duration, power mode) dynamically based on the train's position relative to detected loss-of-contact positions. By adjusting these parameters adaptively, the system optimizes the balance between travel time and contact stability, allowing high-speed operation when safe and coasting when necessary to prevent contact loss.
Data Source
AI summary
A train control device includes a train position detector, a storage, and an in-vehicle controller. The train position detector detects a traveling position of a train. The storage stores therein a traveling position of the train when a loss of contact of the current collector occurs, as a loss-of-contact position. When the train travels in a predetermined section including the loss-of-contact position with reference to the traveling position of the train and the storage, the in-vehicle controller causes the train to perform coasting traveling in the predetermined section.