RFID location system and associated methods for a product dispensing system
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Solution Overview
Problem
Current beverage dispensers face challenges in accurately identifying the positions of ingredient packages or containers due to unreliable radio frequency identification (RFID) tag reading, often resulting in operator errors and contamination, as minimal RF power usage leads to cross-reading issues and incorrect location identification.
Innovation Solution
The use of a maximum power level RF signal to read RFID tags attached to ingredient or flavor containers, combined with a sorting process based on received signal strength indicator (RSSI) values, to improve read success rates and ensure correct positioning of products in beverage dispensers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If minimal RF power is used to read RFID tags, then cross-reading is avoided, but read success rate decreases due to unreliable tag detection
Solution Approach 1:
The system uses RSSI (Received Signal Strength Indicator) feedback to determine the strongest signal source and resolve cross-reading ambiguities. When multiple tags are detected, the RSSI values provide feedback to identify which tag is actually at the target position, allowing the system to reliably distinguish between cross-reads and valid reads.
Solution Approach 2:
The patent changes the RF power parameter from minimal to maximum level to improve tag reading reliability. By using maximum power, the system ensures all tags are detectable, then uses RSSI parameter analysis to identify the correct tag position, resolving the contradiction between detection reliability and location precision.
2Measurement precision
If maximum RF power is used to read RFID tags, then read success rate improves, but cross-reading of neighboring tags occurs
Solution Approach 1:
RSSI feedback allows the system to identify the strongest signal source among multiple detected tags. By analyzing which tag returns the highest RSSI value to a specific antenna, the system can distinguish the valid tag from cross-read interference, even when using maximum RF power.
Solution Approach 2:
The patent converts the harmful cross-reading effect into a useful signal. Instead of treating multiple tag detections as errors to be avoided, the system uses the presence of multiple signals with different RSSI values to identify the correct tag through comparative analysis, turning interference into a discriminative feature.
3Ease of operation
If RFID reading errors occur, then operator errors increase, but implementing RFID systems is costly and complex
Solution Approach 1:
The system enables self-service by automatically identifying ingredient positions and guiding operators through the replacement process. The RFID tags and reading system work autonomously to track ingredient locations and notify when replacement is needed, reducing operator cognitive load and error rates without requiring complex manual tracking procedures.
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 enhances the accuracy of RFID tag reading, reducing operator errors and contamination risks by reliably identifying the correct positions of ingredients and flavors, thereby improving the efficiency of servicing and maintenance in beverage dispensers.
Implementation Method 1
generating an RF signal at a maximum power level
Implementation Method 2
The RFID tags may return RFID signals having an RSSI value in response to the RF signal that is read by the machine
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A machine and process for providing consumer products may include a set of positions configured to contain consumer products or containers in which ingredients are used to form consumer products. The consumer products or containers may include radiofrequency identification (RFID) tags. A set of antennas, where at least one antenna is disposed at each position, may be configured to output and receive RF signals. A transceiver may be in electrical communication with the antennas, and be configured to generate the RF signals. A processor may be in communication with the transceiver, and be programmed to (i) receive RFID signals from the RFID tags at the set of positions, and (ii) identify locations of the RFID tags to determine that corresponding consumer products or containers of ingredients are in correct positions.