Vehicular Tag Reader and Magnetic Sensor Timing for Reliable Data Association
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Solution Overview
Problem
Conventional systems using magnetic markers with affixed wireless tags face challenges in reliably acquiring tag information due to radio wave interference and the potential for incorrect association with non-corresponding magnetic markers.
Innovation Solution
The proposed method involves a vehicular system with a magnetic sensor and a tag reader disposed on the front side of the magnetic sensor. The system acquires tag information from wireless tags affixed to magnetic markers and associates this information with detected magnetic markers only at predetermined timings, erasing the tag information if no corresponding magnetic marker is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission radio waves are strengthened to ensure communication with the wireless tag during vehicle traveling, then communication reliability is improved, but radio wave interference increases
Solution Approach 1:
The tag reader acquires tag information in advance before the magnetic sensor detects the magnetic marker. This preliminary action allows the system to have the tag information ready for association, reducing the need for continuous high-power transmission and thereby reducing radio wave interference while maintaining communication reliability.
Solution Approach 2:
The system performs tag information acquisition and magnetic marker detection at specific periodic intervals rather than continuously. The tag reader operates periodically to acquire tag information, and the magnetic sensor detects markers at predetermined timings, reducing overall radio wave transmission duration and interference while maintaining necessary communication reliability.
2Loss of information
If tag information is acquired continuously to ensure information availability, then information completeness is improved, but incorrect association with non-corresponding magnetic markers increases
Solution Approach 1:
The tag reader acquires tag information in advance before the magnetic sensor detects the corresponding magnetic marker. This preliminary acquisition ensures that when the marker is detected, the associated tag information is already available, maintaining information completeness while enabling accurate temporal association.
Solution Approach 2:
The system uses feedback from the magnetic sensor's detection timing to determine whether to associate or erase the acquired tag information. When a magnetic marker is detected at the predetermined timing, the tag information is associated; otherwise, it is erased. This feedback mechanism ensures accurate association while maintaining information availability when needed.
3Productivity
If the tag reader is positioned to optimize tag information acquisition, then communication efficiency is improved, but the system complexity increases
Solution Approach 1:
The tag reader is specifically positioned on the front side of the magnetic sensor in the longitudinal direction of the vehicle. This localized positioning optimizes the spatial relationship for acquiring tag information before magnetic marker detection, improving communication efficiency without requiring complex adjustable mechanisms.
Solution Approach 2:
The front-side positioning of the tag reader serves multiple functions: it optimizes tag information acquisition timing, maintains a compact vehicle system layout, and ensures the reader is in the optimal position for detecting tags before the magnetic sensor detects markers. This universal positioning reduces overall system complexity while improving communication efficiency.
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 approach reduces the likelihood of erroneously associating tag information with incorrect magnetic markers, thereby enhancing the reliability of information acquisition from wireless tags in vehicular systems.
Implementation Method 1
a tag reader for acquiring the tag information by causing the wireless tag to operate by wireless power feeding
Implementation Method 2
when the magnetic sensor detects any magnetic marker at a predetermined timing
Data Source
AI summary
In a vehicular system for a vehicle in which a tag reader for acquiring tag information from a wireless tag is disposed on a front side of a magnetic sensor array to acquire tag information of wireless tag affixed to a magnetic marker laid in a traveling road, after the tag reader acquires the tag information from any wireless tag, when any magnetic marker is detected at a predetermined timing, a process of associating the tag information with the magnetic marker is performed, and information transmitted from the wireless tag is thereby acquired with high reliability.