Dynamic Charging Time Control for EV Chargers
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Solution Overview
Problem
In conventional vehicle charging systems, the waiting time for charging is prolonged because the charging time is determined by the available capacity of the first vehicle's battery, causing subsequent vehicles to wait until the initial vehicle is fully charged.
Innovation Solution
The system incorporates a usage latency calculation unit to determine the time between the end of charging of one vehicle and the start of charging of the next, allowing for adjustable charging times based on whether vehicles are waiting, thereby reducing waiting times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging time is determined by the available capacity of the first vehicle's battery, then the first vehicle can be fully charged, but the waiting time for subsequent vehicles becomes longer
Solution Approach 1:
The charging time is made dynamic and adjustable based on real-time system conditions. The charging time determination unit varies the charging time according to whether vehicles are waiting in the queue, transitioning from a static full-charge approach to a dynamic time-based approach that responds to system state.
Solution Approach 2:
The charging time parameter is changed based on the number of waiting vehicles. When vehicles are waiting, the charging time is reduced from the full charge duration to a shorter duration, optimizing the balance between charging effectiveness and system throughput.
2Reliability
If charging time is extended to fully charge the battery, then charging reliability is improved, but productivity of the charging device decreases
Solution Approach 1:
The charging duration is made dynamic, adjusting between full charge duration and shorter duration based on system conditions. This allows the system to optimize between ensuring adequate charging (reliability) and maximizing the number of vehicles served (productivity) by responding to real-time queue status.
Solution Approach 2:
The charging device maintains continuous productive operation by preventing idle time between charging cycles. By reducing charging time when vehicles are waiting, the system eliminates gaps in the charging workflow, ensuring the charger is continuously utilized without unnecessary delays.
Data Source
AI summary
A charging device is provided with a charger, a charging time setting unit and a usage latency calculation unit. The charger is configured to charge a vehicle battery. The charging time setting unit sets a charging time for charging the vehicle battery. The usage latency calculation unit calculates a latency of usage of the charger. The usage latency is a time between an end time of charging of a first vehicle connected to the charger and a start time of charging of a second vehicle connected to the charger and charged after the first vehicle. The charging time setting unit compares the usage latency with a first threshold time and a second threshold time shorter than the first threshold time. The charging time setting unit sets the charging time in accordance with whether or not the usage latency is between the first and second threshold times.