Fluid Dispenser Refill Authorization to Prevent Unauthorized Filling
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Solution Overview
Problem
Fluid dispensers are vulnerable to improper or unauthorized refilling, particularly those with external refill containers, as they can be filled with incorrect or unauthorized fluids through the external supply port, leading to issues of quality and authenticity control.
Innovation Solution
The implementation of a system that includes a controller, a fill level sensor, and a keying mechanism for the external refill container, which communicates authorization signals to the dispenser to open or close the supply valve, preventing unauthorized refilling and ensuring only authorized and correct fluids are added to the reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an external supply port is provided for refilling the reservoir, then ease of refilling is improved, but vulnerability to unauthorized refilling increases
Solution Approach 1:
A controller is introduced as an intermediary between the external supply port and the reservoir. The controller receives authorization signals from refill containers and controls the supply valve accordingly, mediating the refilling process to ensure only authorized containers can refill the reservoir while maintaining ease of operation through automated authorization verification
Solution Approach 2:
The system implements feedback through authorization signal transmission between the refill container and controller. The controller monitors whether the connected container is authorized and provides feedback by controlling the supply valve state, creating a closed-loop system that prevents unauthorized refilling while maintaining user-friendly operation
2Reliability
If mechanical or electronic keying mechanisms are used to prevent unauthorized refilling, then protection against unauthorized refilling is improved, but device complexity increases
Solution Approach 1:
Traditional mechanical keying mechanisms are replaced with an electronic authorization signal system. The refill container transmits an authorization signal electronically to the controller, which then controls the supply valve. This substitution reduces mechanical complexity while maintaining or improving security against unauthorized refilling
Solution Approach 2:
The controller serves multiple functions: it manages the supply valve, verifies authorization signals, and controls the refilling process. By consolidating these functions into a single electronic system rather than separate mechanical components, the overall device complexity is reduced while maintaining robust protection against unauthorized refilling
3Difficulty of detecting and measuring
If monitoring systems are implemented to detect improper refilling, then detection capability is improved, but device complexity increases
Solution Approach 1:
The monitoring system uses feedback from the authorization signal transmission process. When a refill container is connected, the controller verifies the authorization signal and monitors the refilling process. If improper refilling is detected (absence of valid authorization signal), the controller can alert users or prevent operation, providing detection capability through the existing authorization verification feedback loop without requiring separate complex monitoring hardware
Data Source
AI summary
A fluid dispenser includes a reservoir for storing a fluid, an outlet port connected with the reservoir by a dispense passage for dispensing fluid stored in the reservoir, an external supply port connected with the reservoir by a supply passage to supply fluid to the reservoir, a supply access valve defining a portion of the supply passage between the external supply port and the reservoir, and a controller in circuit communication with the supply access valve for controller operation of the supply access valve from a closed position to an open position in response to receipt of an authorized supply signal at the controller.