RFID Tag Reader Diagnostics Without Tag Identification Interference
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Solution Overview
Problem
Industrial vehicles equipped with RFID systems face challenges in diagnosing faults, particularly in distinguishing between diagnostic tags and individual tags within a tag layout, and ensuring the diagnostic tag does not interfere with the identification of other tags, while also monitoring operational parameters of the tag reader.
Innovation Solution
The implementation of a diagnostic tag reader module that discriminates between diagnostic and individual tags, modulates power to the diagnostic tag to prevent interference, and generates a missing tag signal if the diagnostic tag is not identified or the tag reader operation is outside specified parameters, enabling the diagnostic tag to be disabled to allow normal tag identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diagnostic tag is continuously enabled for fault detection, then system reliability is improved, but interference with individual tag identification occurs
Solution Approach 1:
The diagnostic tag is enabled and disabled periodically based on the operational state of the RFID system. The controller enables the diagnostic tag when faults are suspected or during diagnostic modes, and disables it during normal individual tag identification operations. This periodic activation resolves the contradiction by providing fault detection capability only when needed, eliminating continuous interference with tag identification.
Solution Approach 2:
The diagnostic function is extracted as a separate, controllable component from the continuous tag identification process. The controller independently manages the diagnostic tag's activation state, separating its function from the normal identification workflow. This allows the diagnostic tag to be removed from the active field during identification operations, preventing interference while maintaining diagnostic capability when required.
2Reliability
If the diagnostic tag is always active within read range, then diagnostic coverage is improved, but system complexity increases
Solution Approach 1:
The diagnostic tag operates autonomously within the read range, requiring no additional management infrastructure. It automatically responds to reader queries and provides diagnostic information when enabled, eliminating the need for external diagnostic equipment or complex management systems. The tag itself performs the diagnostic function, reducing overall system complexity while maintaining comprehensive diagnostic coverage.
3Object-generated harmful factors
If power modulation is applied to the diagnostic tag, then interference with individual tags is reduced, but energy consumption increases
Solution Approach 1:
Power is modulated to the diagnostic tag in periodic cycles rather than continuously. The controller applies power during diagnostic intervals and cuts power during normal identification operations. This periodic power application reduces interference with individual tags while the energy consumed for modulation is minimal compared to continuous operation, as the tag remains dormant during non-diagnostic periods.
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 effectively identifies faults in the RFID system, prevents interference with individual tags, and ensures reliable operation of the industrial vehicle by generating a missing tag signal when faults are detected, allowing for timely intervention to prevent system degradation.
Implementation Method 1
modulating power to the diagnostic tag such that the diagnostic tag does not interfere with the identification of the individual tags of the tag layout
Data Source
AI summary
An industrial vehicle comprising a tag reader, a reader module, and a diagnostic tag, wherein the diagnostic tag is coupled to the industrial truck within a read range of the tag reader. The reader module and the tag reader cooperate to identify the diagnostic tag and individual tags of a tag layout and the reader module discriminates between the individual tags of the tag layout and the diagnostic tag and the individual tags of the tag layout, correlates an identified individual tag of the tag layout with tag data, correlates an identified diagnostic tag with operation of the tag reader, and generates a missing tag signal if the diagnostic tag is not identified or the operation of the tag reader is not within specified operating parameters.