Wireless EV Charging Reconnection Across Ranked Frequency Channels
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Solution Overview
Problem
Existing contactless charging systems face challenges in safely continuing charging when wireless communication between the vehicle and the ground-side device is interrupted, leading to a risk of overcharging.
Innovation Solution
The system includes a power feed device with a communication device that checks the communication state and reconnects the communication using a ranked list of frequency channels to ensure safe and continuous charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If charging is continued using stored information during communication interruption, then charging continuity is maintained, but reliability of charging control deteriorates due to information aging
Solution Approach 1:
The system performs preliminary actions by continuously checking communication status and preparing alternative communication channels before complete communication failure occurs. The power transmission ECU monitors communication quality and proactively switches to backup frequency channels or communication methods, ensuring reliable charging control even during interruptions.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring communication status and charging parameters. When communication is interrupted, the system uses feedback from previously received information combined with real-time monitoring of charging state to maintain safe charging operation, and immediately updates control parameters when communication is restored.
2Device complexity
If a single frequency channel is used for communication, then device complexity is reduced, but reliability of communication deteriorates during interference or interruption
Solution Approach 1:
The system merges multiple frequency channels into a unified communication framework. The power transmission ECU maintains a ranked list of multiple frequency channels and can switch between them based on communication quality. This combining approach provides redundancy without significantly increasing device complexity, as the same communication hardware is used across different frequencies.
Solution Approach 2:
The system changes communication parameters by switching frequency channels when interference or interruption is detected. The power transmission ECU monitors communication quality and dynamically changes the operating frequency to maintain reliable communication, using a ranked list of alternative frequencies as fallback options.
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 solution allows for safe continuation of charging even during communication interruptions, reducing the risk of overcharging by quickly reestablishing communication and optimizing channel usage.
Implementation Method 1
contactless power transmission by a coil on the vehicle side and a coil on the ground side
Data Source
AI summary
A vehicle includes: a power reception coil that contactlessly receives power from a power transmission coil on a ground; a battery that stores the power; a control device that executes charging control of the power to the battery; and a communication device that performs wireless communication with a ground-side device. Further, the control device checks a relationship between a number of devices that use each of other frequency bands different from a frequency band used for the wireless communication with the ground-side device and a radio field intensity of each of the other frequency bands, and rank channels of the other frequency bands according to a check result, and try to reconnect to the ground-side device the communication with which is interrupted in order of the ranked channels.