Contactless Power Feeding Segment Fault Detection by Matched Timing
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Solution Overview
Problem
Existing contactless power feeding systems cannot individually detect abnormality in power supply segments, especially when multiple consecutive segments are affected.
Innovation Solution
A contactless power feeding system that includes power transmission and reception characteristic acquisition units on the power supply segment and vehicle sides, respectively, with a server device to match measurement periods and calculate efficiency to determine segment abnormality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical characteristic comparison is performed between target segment and adjacent segments, then abnormality detection capability is improved, but individual segment abnormality detection is lost when multiple consecutive segments are abnormal
Solution Approach 1:
The patent divides the power supply system into multiple segments (first power supply segment, second power supply segment, third power supply segment) and performs abnormality determination for each segment individually by comparing its electrical characteristics with the other two segments. This segmentation allows identification of which specific segment is abnormal even when multiple segments are affected, resolving the contradiction between improving abnormality detection capability and maintaining individual segment detection precision.
2Adaptability or versatility
If power transmission and reception characteristics are measured separately, then measurement flexibility is improved, but efficiency calculation accuracy deteriorates due to measurement period mismatch
Solution Approach 1:
The patent employs a feedback mechanism where the server device receives electrical characteristic information from multiple segments and the vehicle, compares measurement periods, and provides corrected efficiency calculations. The system uses the measured characteristics as feedback to identify timing mismatches and adjusts the efficiency calculation accordingly, maintaining both measurement flexibility and calculation accuracy.
Solution Approach 2:
The server device acts as an intermediary between the power supply segments and the vehicle. It collects electrical characteristic information from all segments and the vehicle, matches the measurement periods, and performs the efficiency calculation. This intermediary role resolves the timing mismatch issue while preserving the flexibility of separate measurements by coordinating them centrally.
Data Source
AI summary
A contactless power feeding system that contactlessly supplies power from a power supply segment on a traveling path to a vehicle, includes: a power transmission characteristic acquisition unit, provided on the power supply segment, measures a power transmission characteristic of the power supply segment; a power reception characteristic acquisition unit, provided on the vehicle and measures a power reception characteristic of the vehicle; and an abnormality detection means that matches a measurement period of the power transmission characteristic of the power supply segment with a measurement period of the power reception characteristic of the vehicle, calculates efficiency of the power supply segment using the power transmission characteristic of the power supply segment and the power reception characteristic of the vehicle, the measurement periods of which are matched, and determines abnormality of the power supply segment on a basis of the calculated efficiency.