Dynamic Object Detection Range for Non-Contact Charging Safety
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Solution Overview
Problem
Existing non-contact charging systems face challenges in efficiently charging electric vehicles while minimizing exposure to leakage magnetic fields and preventing unnecessary power termination due to positional shifting between the power supplying and receiving coils, leading to extended charging times or incorrect power termination.
Innovation Solution
A power receiving body equipped with a peripheral object detecting unit, an object detection range setting unit, and a leakage magnetic field area estimating unit that dynamically sets the object detection range to correspond with the leakage magnetic field area, allowing for reliable detection of objects within the magnetic field and minimizing unnecessary detection outside of it, thereby maintaining charging while adjusting power supply accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the object detection range is set to a wide range to cover the leakage magnetic field area when positional shifting is large, then object detection reliability is improved, but unnecessary detection of objects outside the magnetic field area increases leading to incorrect power termination
Solution Approach 1:
The object detection range is dynamically adjusted based on the detected positional shift between the power supplying coil and power receiving coil. When positional shift is small, the detection range is set to a smaller first range; when positional shift is large, the detection range is expanded to a larger second range. This dynamic adjustment ensures reliable detection while minimizing unnecessary detection and power termination.
Solution Approach 2:
The system changes the detection range parameter based on the positional shift condition. By detecting the positional shift amount and selectively setting the detection range parameter (first range or second range), the system optimizes the balance between detection reliability and energy efficiency, preventing both undetected objects and false detections.
2Productivity
If the object detection range is set to a narrow range to reduce unnecessary detection, then charging efficiency is improved, but object detection reliability deteriorates when positional shifting occurs
Solution Approach 1:
The detection range is made dynamic rather than fixed. The system continuously monitors positional shift and adjusts the detection range accordingly, ensuring that the range is always appropriate for the current charging condition. This resolves the contradiction by adapting the range to maintain both efficiency and reliability.
Solution Approach 2:
The system uses feedback from positional shift detection to adjust the object detection range. By continuously monitoring the alignment between coils and adjusting the detection range based on this feedback, the system ensures reliable object detection while minimizing unnecessary detection and maintaining charging efficiency.
3Productivity
If power supply is increased to reduce charging time, then charging efficiency is improved, but the leakage magnetic field area expands increasing safety risks
Solution Approach 1:
The object detection range is dynamically adjusted based on positional shift conditions. When positional shift is large, the detection range is expanded to monitor a wider area for objects, allowing the system to safely maintain or adjust power supply levels while accounting for the expanded magnetic field area, thus balancing charging efficiency with safety.
4Object-affected harmful factors
If power supply is constricted to reduce leakage magnetic field area, then safety is improved, but charging time is significantly extended
Solution Approach 1:
The system dynamically adjusts both the detection range and power supply based on positional shift conditions. By expanding the detection range when positional shift is large, the system can monitor for objects more effectively and make informed decisions about power supply, avoiding unnecessary power constriction and thus preventing extended charging times while maintaining safety.
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 enables reliable detection of objects within the leakage magnetic field area, reduces unnecessary detection, and minimizes extended charging times by dynamically adjusting the object detection range based on the charging conditions, ensuring efficient and safe non-contact charging even with relative positional shifting.
Implementation Method 1
a power receiving coil that receives power supplied from a power supplying coil in a non-contact manner by electromagnetic induction
Implementation Method 2
a leakage magnetic field area estimating unit that estimates a leakage magnetic field area in which a magnetic field intensity by the power supplying coil becomes equal to or greater than a predetermined value
Data Source
AI summary
A power receiving body and a vehicle including the power receiving body are provided, in which an object detection range, which corresponds to a non-contact charging condition between a power supplying coil and a power receiving coil, is set, together with variably setting the object detection range corresponding to a leakage magnetic field area.