Coffee Brewing Conductivity Feedback for Extraction Strength Control
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Solution Overview
Problem
Existing coffee brewing methods lack precision in controlling extraction strength over time, leading to inconsistent taste profiles, particularly in fully automatic coffee machines, where the optimal extraction strength for desired coffee properties is not consistently achieved.
Innovation Solution
A method and device for producing caffeinated hot beverages that utilize a brewing unit with a control and regulation system to adjust extraction strength by measuring physical properties like conductivity and refractive index, allowing for real-time adjustments of brewing parameters such as water flow and temperature to achieve a desired taste profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If extraction strength is increased to produce intense coffee taste, then more aroma and flavor substances are dissolved, but excessive tannic acids and bitter substances are also dissolved creating unwanted bitterness
Solution Approach 1:
The patent applies dynamics by continuously adjusting the contact pressure on the coffee grounds during the brewing process. The pressing force is not static but varies over time to optimize extraction while preventing excessive dissolution of bitter substances. This dynamic adjustment allows the system to adapt extraction strength during the brewing process.
Solution Approach 2:
The patent implements feedback control by measuring the conductivity of the brewing liquid in real-time and using this information to adjust the pressing force on the coffee grounds. The conductivity measurement provides feedback about the extraction progress, allowing the control device to modify the pressing force to achieve optimal extraction without excessive bitter substance dissolution.
2Object-generated harmful factors
If extraction strength is decreased to reduce bitter substances, then fewer tannic acids are dissolved, but more acidic components are dissolved proportionally creating a thin and watery coffee
Solution Approach 1:
The patent uses dynamic adjustment of pressing force during the brewing process to maintain optimal extraction strength. By varying the contact pressure on the coffee grounds over time, the system prevents both excessive extraction of bitter substances and insufficient extraction that would result in thin, watery coffee.
Solution Approach 2:
The conductivity measurement provides continuous feedback about the extraction progress and composition of the brewing liquid. This feedback enables the control device to adjust the pressing force to maintain the right balance between extracting aromatic substances and avoiding excessive acidic component dissolution.
3Extent of automation
If conductivity measurement is used to determine brewing endpoint, then the brewing process can be automated, but the measurement precision is insufficient to optimize extraction strength throughout the process
Solution Approach 1:
The patent uses conductivity measurement as a feedback signal to control the pressing force during brewing. The conductivity value provides information about the extraction progress, and this feedback is used by the control device to dynamically adjust the pressing force to optimize extraction strength throughout the process.
Solution Approach 2:
The patent changes the parameter being controlled from a simple binary endpoint detection to continuous adjustment of pressing force based on conductivity measurements. By using the conductivity data to modulate the pressing force parameter, the system achieves more precise control over extraction strength.
4Reliability
If volume flow control is used to maintain consistent brewing, then the brewing process can be regulated, but it does not account for variations in extraction strength over time
Solution Approach 1:
The patent introduces conductivity measurement as an additional feedback mechanism that specifically monitors extraction strength. This feedback is used to adjust the pressing force independently of volume flow control, allowing the system to maintain both consistent brewing and optimal extraction strength throughout the process.
Solution Approach 2:
The patent dynamically adjusts the pressing force during the brewing process based on real-time conductivity measurements. This dynamic control allows the system to compensate for variations in extraction strength that occur over time, maintaining optimal extraction despite the natural progression of the brewing process.
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 enables precise control over the brewing process, allowing for consistent production of high-quality coffee with tailored taste profiles, reducing the impact of undesirable substances and optimizing extraction strength, resulting in a better-tasting coffee that meets user preferences.
Implementation Method 1
at least one first measuring unit for determining at least one physical material property of the coffee beverage and/or a physical variable dependent thereon
Implementation Method 2
The at least one physical material property can advantageously be the electrical conductivity of the caffeinated hot beverage
Data Source
AI summary
A method by means of which caffeinated hot beverages, particularly coffee beverages, are produced by an apparatus, particularly a beverage dispenser (1), for producing a caffeinated hot beverage, from water and a caffeinated raw material, particularly ground coffee, in a brewing unit (10), wherein the method furthermore comprises at least the following steps: A) determining the physical material property and/or physical variable and optionally the process property of the caffeinated hot beverage by at least the first measuring unit (4 or 24); B) carrying out a comparison by means of the control and/or regulating unit (18) between an actual value and a set point value of said physical material property and/or the physical variable and optionally the process property, wherein the control and/or regulating unit (18) uses the data memory in which data records of set point values and/or set point value ranges are stored according to the temperature and/or a desired caffeinated hot beverage and/or a supplied coffee type, C) wherein, if the actual value is outside the set point value range, at least one control and/or manipulated variable is adjusted in the method by means of the control and/or regulating unit (18) such that a physical material property, particularly the aforementioned physical material property, of the dispensed caffeinated hot beverage is influenced in a controlled or regulated manner.