EV Charging Control Unit Prioritizing Vehicles by Departure Time
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Solution Overview
Problem
Existing charging control techniques for electric vehicles do not consider the necessary charging periods and planned departure times, leading to situations where vehicles with short charging needs and imminent departure times are delayed due to vehicles with ample time to spare.
Innovation Solution
A charging control unit that calculates estimate values for charging and rest periods for each vehicle, allowing charging to commence only when specific conditions are met, ensuring that vehicles can charge and complete their sessions before their planned departure times by prioritizing interrupt charging based on these calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If charging is performed in first-come basis order, then charging simplicity is maintained, but vehicles with short charging needs and imminent departure times may be delayed
Solution Approach 1:
The system performs preliminary calculations of charging completion times and departure times before determining the charging order. By pre-calculating these parameters and comparing them, the system can proactively identify vehicles that would benefit from priority charging, preventing time loss before it occurs rather than reacting after delays happen
Solution Approach 2:
The charging order is made dynamic rather than static. The system continuously evaluates charging completion times, departure times, and vehicle priorities to adjust the charging sequence in real-time. This dynamic reordering allows the system to optimize charging allocation based on current conditions, balancing operational simplicity with time efficiency
2Device complexity
If vehicles are charged sequentially without considering departure times, then charging control complexity is reduced, but charging efficiency decreases
Solution Approach 1:
The system implements feedback mechanisms by continuously monitoring charging progress, comparing actual charging completion times with planned departure times, and using this information to adjust subsequent charging decisions. This feedback loop enables the system to improve charging efficiency through learned patterns while maintaining manageable control complexity through automated decision-making
Solution Approach 2:
The system changes key parameters such as charging priority levels, charging power allocation, and charging sequence based on calculated time parameters. By dynamically adjusting these parameters according to vehicle-specific needs and departure times, the system optimizes charging efficiency without requiring overly complex control structures
3Device complexity
If charging order is determined without calculating Tc and Tr values, then calculation complexity is reduced, but charging timing accuracy deteriorates
Solution Approach 1:
The system performs preliminary calculations of Tc (charging completion time) and Tr (departure time) for each vehicle before determining the final charging order. By pre-calculating these critical time parameters, the system ensures accurate timing predictions that enable precise charging scheduling, preventing timing errors before they affect the charging process
Data Source
AI summary
A charging control unit determines whether the electric vehicles are coupled to the respective charging ports and calculates the estimate value Tc and the estimate value Tr for every charging port coupled. The estimate value Tc is the period from start of charging to completion of charging. The estimate value Tr is the period from completion of charging to departure. The charging control unit, when the electric vehicle coupled t last is set to the N-th vehicle and the electric vehicles already coupled are set to the first to N−1-th vehicles in the order of being coupled, and only when Formula (4) is satisfied by all the first to N−1-th vehicles, starts charging of the N-th vehicle. The charging control unit controls to resume charging of the vehicle that was charging immediately before the N-th vehicle started charging as soon as charging of the N-th vehicle finishes.