Wireless Vehicle Charging Foreign Object Alerts by Charging Intent
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Solution Overview
Problem
Wireless power transmission systems for vehicles often result in unnecessary notifications due to foreign objects, leading to user annoyance, as existing solutions do not effectively differentiate between power transmission conditions and non-transmission conditions.
Innovation Solution
A power transmission device equipped with a power transmitter, detector, position information acquirer, instruction receiver, and information emitter that only notifies the presence of foreign objects when the vehicle is within the power transmission range and an instruction to transmit power is received, thereby reducing unnecessary notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system constantly notifies the user about foreign objects detected near the power transmission device, then foreign object detection accuracy is improved, but user annoyance increases due to unnecessary notifications
Solution Approach 1:
The system changes the notification parameter from constant to conditional based on vehicle presence detection. The notification is suppressed when no vehicle is detected in the power transmission range, even if foreign objects are present, thereby reducing unnecessary notifications while maintaining detection accuracy
Solution Approach 2:
The vehicle detection function acts as an intermediary condition between foreign object detection and user notification. The system uses vehicle presence as a mediating parameter to determine whether to notify the user about foreign objects, filtering out notifications that would be unnecessary
2Object-affected harmful factors
If the system notifies the user about foreign objects only when a vehicle is present in the power transmission range, then user annoyance is reduced, but information completeness deteriorates when vehicles are absent
Solution Approach 1:
The notification function applies local quality by being selectively active only in the specific context where a vehicle is present in the power transmission range. The system tailors the notification behavior to the local condition of vehicle presence, providing information when relevant and suppressing it when unnecessary
3Reliability
If the system performs foreign object detection continuously, then detection reliability is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic action by performing foreign object detection continuously but notifying users only periodically when specific conditions (vehicle presence) are met. This maintains detection reliability while reducing the effective notification frequency to match actual needs
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 effectively minimizes user annoyance by preventing unnecessary notifications when the vehicle is not instructed to receive power, even if a foreign object is detected within the power transmission range.
Implementation Method 1
In general, electromagnetic induction is used to transmit power between the power transmission device and the power receiving device
Implementation Method 2
When power is being transmitted between the power transmission device and the power receiving device, if a conductive object different than the power receiving device is disposed near the devices, eddy current will be generated in that object due to electromagnetic induction
Data Source
AI summary
A power transmission device that wirelessly transmits power to a vehicle, the power transmission device including an information emitter that, in a case in which the position of the vehicle acquired by the information acquirer is located in a power transmission range of the power transmission coil and, also, the instruction receiver receives the instruction about power transmission, emits a first type of information that indicates a presence of the foreign object when the detector detects the foreign object, and in a case in which the instruction receiver does not receive the instruction about power transmission even though the position of the vehicle acquired by the position information acquirer is located in the power transmission range of the power transmission coil, does not emit the information that indicates the presence of the foreign object.