Coffee Capsule Recognition Using Vibration Sensing During Brewing
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Solution Overview
Problem
Existing coffee capsule recognition techniques require special features on the capsules or complex sensors in machines, leading to increased manufacturing and operational costs, and unreliable results due to environmental conditions within coffee machines.
Innovation Solution
A method and system that uses a vibration sensor to detect the unique vibration characteristics of a coffee capsule during brewing, recognizing different types based on asymptotic vibration amplitude and saturation time without requiring special capsule features or complex machine modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If special features (shape, reflection elements, coloured areas) are provided on coffee capsules for recognition, then capsule recognition capability is improved, but manufacturing cost of capsules increases
Solution Approach 1:
The coffee capsule itself serves as the recognition element through its natural physical properties (mass, vibration characteristics) during the brewing process, without requiring any additional special features. The capsule's inherent mechanical response to pump-induced vibrations provides the recognition signal, eliminating the need for manufactured identification features.
Solution Approach 2:
The patent replaces optical/electronic recognition systems (light sensors, color detection) with a mechanical vibration-based recognition system. The pump's mechanical vibrations are transmitted through the capsule holder to the capsule, and the capsule's mechanical response (resonance frequency, damping) is used for identification.
2Reliability
If complex sensors (light sensors, colour detectors) are implemented in coffee machines for capsule recognition, then recognition capability is improved, but device complexity and cost increase
Solution Approach 1:
The pump, which is already a necessary component for water delivery in the coffee machine, is used to generate vibrations for capsule recognition. This multi-functional use of the pump eliminates the need for separate dedicated sensors, reducing system complexity while maintaining recognition capability.
Solution Approach 2:
The coffee machine's existing mechanical components (pump, capsule holder) serve dual purposes: their primary function for beverage preparation and their secondary function as vibration sources and transmission paths for capsule identification, eliminating the need for additional specialized sensing equipment.
3Ease of operation
If light sensors are used for capsule recognition in coffee machines, then recognition function is achieved, but reliability decreases due to unfavorable environmental conditions (high humidity, darkness)
Solution Approach 1:
The patent replaces optical sensing (light-based) with mechanical sensing (vibration-based). Since the mechanical vibration system operates independently of optical conditions, it functions reliably in the dark, humid environment inside the coffee machine where light sensors would fail.
Solution Approach 2:
The patent introduces mechanical vibrations as an intermediary medium for capsule recognition. Instead of using light (which is blocked by darkness and affected by humidity), the system uses mechanical vibrations that can propagate through the solid components (pump, capsule holder, capsule) regardless of environmental optical conditions.
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 provides reliable and cost-effective capsule recognition without additional manufacturing costs for capsules or machine complexity, as the vibration sensor can operate effectively in a more favorable environment, offering robust and reliable identification of coffee capsules.
Implementation Method 1
detecting vibrations of a component of the capsule coffee machine, the component being rigidly connected with the coffee capsule within the machine, and generating a vibration signal corresponding thereto
Data Source
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AI summary
It is disclosed a method and system for recognizing coffee capsules used by a capsule coffee machine, wherein a vibration sensor is arranged within the capsule coffee machine to detect vibrations of a machine component (e.g. the pump, or the capsule holder, or the hydraulic circuit connecting the pump with the capsule holder) rigidly connected with the coffee capsule fitted in the machine during the brewing of a coffee beverage. As the brewing is started, the vibration sensor detects the vibrations to which the machine component (and all the other machine components rigidly connected thereto during the brewing, including the variable-mass coffee capsule) is subjected, and generates a vibration signal corresponding thereto. The vibration signal is then processed for determining at least one parameter thereof. The coffee capsule is then recognized based on the value of the determined parameter(s).