Wireless Power Foreign Object Detection With Adaptive Reference Imaging
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Solution Overview
Problem
The accuracy of foreign substance detection in wireless power transmission systems deteriorates when the state of the detection region changes due to factors like dirt on the power transmission coil cover or aged deterioration.
Innovation Solution
A foreign substance detection device that uses an imaging device to capture images and compares them with a reference image, updating the reference image when certain conditions are met to maintain detection accuracy, even if the state of the detection region changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reference image is used for foreign substance detection, then the detection method is simple, but the detection accuracy deteriorates when the detection region state changes
Solution Approach 1:
The reference image is changed from a fixed static image to a dynamic updated image that adapts to changes in the detection region. The determination unit updates the reference image based on captured images when no foreign substance is detected, allowing the system to adapt to gradual changes in the detection region state while maintaining simple detection logic.
Solution Approach 2:
The system implements feedback by using the captured image (when free of foreign substance) to update the reference image. This feedback mechanism allows the system to learn and adapt to changes in the detection region state, improving detection accuracy over time while maintaining a simple operational framework.
2Measurement precision
If the reference image is updated frequently, then detection accuracy is maintained, but system complexity and processing load increase
Solution Approach 1:
The system performs self-updating of the reference image automatically without requiring external intervention or complex processing. The determination unit autonomously decides when to update the reference image based on the detection results, simplifying the overall system architecture while maintaining accurate detection.
Solution Approach 2:
Instead of continuously updating the reference image, the system performs partial updates only when necessary (when no foreign substance is detected). This reduces processing load and system complexity while maintaining detection accuracy by updating the reference image at appropriate intervals rather than constantly.
Data Source
AI summary
A foreign substance detection device for limiting deterioration in accuracy of foreign substance detection even if a foreign substance detection region changes. The device includes an imaging device configured to keep a region for detecting a foreign substance in an imaging range of the imaging device and a determination unit configured to determine a presence or absence of the foreign substance on the basis of a result of comparing a captured image captured by the imaging device with a reference image free of the foreign substance in the imaging range. The determination unit determines that the captured image is free of a foreign substance on the basis of the result of comparing and a prescribed first condition is satisfied, the unit executes an update process of replacing the reference image with the captured image for which the unit determines freedom of a foreign substance as an updated reference image.