Multi-Axis Magnetic Marker Detection Under External Disturbance
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Solution Overview
Problem
Conventional magnetic marker detection systems face reliability issues due to external magnetic disturbances, such as vehicles passing nearby, which can impair the accuracy of magnetic marker detection.
Innovation Solution
A magnetic marker detection method and system that utilizes a magnetic sensor capable of measuring magnetic components along multiple axes, identifying a candidate zone based on changes in magnetic component directions, and determining marker detection through synchronization between signals from different axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic sensors are used to detect magnetic markers on the road, then vehicle control functions such as automatic steering and lane departure warning can be achieved, but detection reliability is impaired due to external magnetic disturbances from passing vehicles
Solution Approach 1:
The patent transitions from single-axis magnetic component detection to multi-axis (two or more axes) magnetic component detection. By measuring magnetic components along multiple axes and analyzing their synchronized changes, the system can distinguish true magnetic marker signals from external disturbances, thereby improving detection reliability while maintaining simplicity
Solution Approach 2:
The system uses feedback from multiple magnetic component measurements to verify detection results. By checking whether changes in magnetic components along different axes occur synchronously and match expected patterns, the system confirms whether a detected signal represents a genuine magnetic marker or external interference, enhancing reliability through self-verification
2Reliability
If magnetic marker detection is performed using conventional single-axis methods, then the system remains simple, but false detections occur due to external disturbances
Solution Approach 1:
The patent adds dimensional complexity by measuring magnetic components along two or more axes instead of one. This multi-axis approach enables the system to differentiate between genuine magnetic marker signals and external disturbances through pattern recognition, improving detection accuracy while keeping the additional complexity manageable
Solution Approach 2:
The system changes the detection parameter from single-axis magnetic component magnitude to multi-axis magnetic component vector characteristics. By analyzing the synchronized changes and directional patterns of magnetic components along multiple axes, the system achieves more reliable detection without requiring complex additional hardware
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
Enhances the reliability of magnetic marker detection by identifying a candidate zone with high precision and confirming marker presence using synchronization between multiple axis signals, reducing false positives and improving overall detection accuracy.
Implementation Method 1
a magnetic sensor capable of measuring magnitudes of magnetic components acting along a plurality of axes including at least two axes
Data Source
AI summary
In a marker detection system for a vehicle including a magnetic sensor to detect a magnetic marker laid in a road surface, the magnetic sensor can measures, for each axis, magnitudes of magnetic components acting along an axis in a vertical direction and an axis in a forwarding direction, and a detection unit identifies a candidate zone to which a possibility that the magnetic marker belongs is high, based on a change in a forwarding direction of the vehicle of a magnetic measurement value along any of the axes and determines whether the magnetic marker has been detected in accordance with a degree of synchronization between a first signal indicating a change of a magnetic measurement value regarding one axis in the candidate zone and a second signal indicating a change of a magnetic measurement value regarding the other axis in the candidate zone.