Dynamic Voltage Control for Energy Storage in Contactless Charging
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Solution Overview
Problem
Energy storage devices in contact-wireless transportation systems face premature disablement due to voltage fluctuations outside allowable ranges during operation and altitude changes, leading to reduced lifespan.
Innovation Solution
A charging method and system that control the voltage of energy storage devices to maintain a margin within allowable limits by charging near the maximum allowable voltage and ensuring the voltage remains above the minimum during use and below the maximum during regenerative braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the energy storage device charges to maximum capacity at each station stop, then the vehicle can operate for longer distances between charges, but the voltage exceeds the maximum allowable value during regenerative braking, causing disablement
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the charging voltage threshold based on predicted regenerative braking conditions. Instead of using a fixed maximum voltage threshold, the system modifies the charging parameter (voltage threshold) to prevent exceeding maximum allowable voltage during regenerative braking, thereby maintaining reliability while maximizing operating duration.
Solution Approach 2:
The system performs preliminary action by predicting future regenerative braking events before they occur. Using altitude data and route information, the system anticipates voltage increases during upcoming downhill sections and proactively adjusts charging parameters at the current station, preventing future disablement events.
2Productivity
If the vehicle operates for extended periods between charges, then productivity increases, but the voltage drops below the minimum allowable value during high current discharge, causing disablement
Solution Approach 1:
The system performs preliminary action by predicting future high-current discharge events based on route altitude profiles. Before operating for extended periods, the system identifies upcoming uphill sections that will require high current output and adjusts the minimum voltage threshold in advance, ensuring reliability is maintained while maximizing productivity.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the minimum voltage threshold based on predicted discharge conditions. Instead of using a fixed minimum voltage, the system modifies this parameter to account for anticipated high-current demands, enabling longer operating periods while preventing disablement.
3Use of energy by moving object
If the charging voltage threshold is set high to maximize energy storage, then energy efficiency improves, but the voltage exceeds maximum allowable limits during regenerative braking, leading to interlock function activation
Solution Approach 1:
The system applies parameter changes by adjusting the charging voltage threshold dynamically rather than using a fixed high value. The threshold is modified based on predicted regenerative braking conditions, allowing the system to maintain high energy efficiency when safe while preventing voltage exceedance that would trigger the interlock function.
Solution Approach 2:
The system uses feedback from altitude data and route information to continuously adjust charging parameters. By monitoring environmental conditions and predicting future voltage changes, the system provides feedback-based control that maximizes energy efficiency while maintaining reliability through interlock prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prolongs the life of energy storage devices by maintaining sufficient voltage margins, preventing disablement and extending their usable life across varying operational conditions.
Implementation Method 1
each station on the track is provided with a charging device, and when the vehicle stops at the station, the charging device supplies power to the energy storage device of the vehicle
Data Source
AI summary
A charging method is used for a transportation vehicle without a contact wire. The transportation vehicle is configured so that when a vehicle (1) equipped with an energy storage device (5) stops at a station on a track (2), the energy storage device (5) of the vehicle (1) is charged by a charging device (9) provided on a ground side. The charging method includes charging, by the charging device (9), the energy storage device (5) with a voltage set value (VS) which is near a maximum allowable voltage value (VH) of the energy storage device (5).