Rail Vehicle Power-Line Control for Stable Battery Charge Sharing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional railroad systems face challenges in synchronizing the charge and discharge of electric storage devices in hybrid vehicles with the state of the vehicle and the electric storage device, leading to inefficiencies and potential damage from overcharging or over-discharging.
Innovation Solution
A railroad system with a control mechanism that allows or prohibits charge/discharge of the electric storage device based on detection values such as charge accumulation amount, distance between vehicles, and voltage values, using set values to maintain stable states and prevent overcharging or over-discharging, thereby extending the service life of the electric storage element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric storage device charges or discharges based on real-time vehicle state and distance detection, then energy efficiency and device longevity are improved, but system complexity and control difficulty increase
Solution Approach 1:
The control part pre-establishes first and second set values for distance detection before charge/discharge operations begin. These threshold values are predetermined based on safe operating parameters, allowing the system to make immediate control decisions without complex real-time calculations, thus extending device service life while maintaining manageable system complexity
Solution Approach 2:
The system continuously detects the distance between vehicles and compares it against the pre-set first and second threshold values. This feedback mechanism enables dynamic adjustment of charge/discharge feasibility based on real-time conditions, improving reliability by preventing overcharging or over-discharging while using simple threshold comparisons to avoid excessive control complexity
2Productivity
If the system allows charge and discharge operations based on distance detection, then power sharing between vehicles is optimized, but the risk of overcharging or over-discharging increases
Solution Approach 1:
The control part establishes prohibitive distance thresholds (first and second set values) that prevent charge/discharge operations before harmful conditions occur. When the detected distance exceeds these thresholds, the system proactively prohibits operations, counteracting potential overcharging or over-discharging damage before it can affect the electric storage device
Solution Approach 2:
The system dynamically adjusts charge/discharge feasibility based on real-time distance detection between vehicles. As distance changes, the control part transitions between allowing and prohibiting operations, optimizing power sharing efficiency while adaptively preventing harmful conditions through continuous monitoring and threshold-based control
3Stability of the object's composition
If hysteresis control with different set values is implemented, then charge/discharge stability is improved, but control precision requirements increase
Solution Approach 1:
The system uses asymmetric first and second set values for distance thresholds, where the prohibitive threshold differs from the permissive threshold. This asymmetry creates a hysteresis effect that stabilizes charge/discharge operations by preventing rapid state transitions, compensating for limitations in distance detection precision through deliberately unequal threshold values
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
To provide a railroad system including a first vehicle and a second vehicle electrically connected to a certain power line. The first vehicle includes a drive part, an inverter configured to drive the drive part by acquiring power from the power line, an electric storage device configured to supply power to the power line or accumulate power from the power line, and a control part. The control part is configured to control feasibility of charge or discharge of the electric storage device based on a detection value of any of a charge accumulation amount of the electric storage device, a distance between the first vehicle and the second vehicle, or a voltage value of the power line. When it is assumed that the detection value when charge or discharge of the electric storage device is switched from an allowable state to a prohibited state is a first set value, and the detection value when charge or discharge of the electric storage device is switched from a prohibited state to an allowable state is a second set value, the first set value and the second set value are different from each other.