Coffee Brewing Flow-Time Control for Consistent Flavor Quality
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Solution Overview
Problem
Coffee machines experience significant fluctuations in coffee taste and quality due to variables like coffee grinding degree and compaction, leading to inconsistent flavor profiles, even under constant conditions.
Innovation Solution
Regulating the total flow time of brewing water through coffee powder to maintain consistent flavor, regardless of grinding degree, by actively controlling the flow rate using a counter-pressure valve to ensure a predetermined total throughput time, which compensates for differences in grinding and allows for optimization of coffee powder usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the degree of grinding of coffee powder is varied, then the flow rate of brewing water changes, but the taste and quality of coffee beverages fluctuate significantly
Solution Approach 1:
The patent changes the control parameter from degree of grinding to total flow time. By maintaining a constant total flow time regardless of grinding degree, the system achieves consistent taste and quality while allowing flexibility in coffee preparation preferences.
Solution Approach 2:
The system measures the actual flow rate during brewing and adjusts the brewing process to compensate for variations. This feedback mechanism ensures that the total flow time remains constant, thereby maintaining consistent coffee quality despite variations in grinding degree.
2Productivity
If fine grinding is used to achieve espresso flavor, then extraction efficiency improves, but fine grind flavors are lost and coffee quality decreases
Solution Approach 1:
The patent shifts the critical control parameter from particle size (grinding degree) to total flow time. This allows coarser grinds to be used while maintaining extraction efficiency through extended flow time, preserving fine grind flavors that would otherwise be lost.
Solution Approach 2:
The system dynamically adjusts the brewing process based on actual flow rate measurements. By controlling the total flow time rather than prescribing a fixed grinding degree, the system adapts to different coffee preparations while maintaining optimal extraction and flavor quality.
3Speed
If manual adjustment of spring preload is used to regulate flow rate, then flow rate control is achieved, but manufacturing precision and consistency are limited
Solution Approach 1:
The patent replaces the mechanical spring-based flow rate control system with an electronic measurement and control system. Flow rate sensors and electronic regulation mechanisms provide precise, consistent control that eliminates the imprecision of manual mechanical adjustment.
Solution Approach 2:
The system continuously measures the actual flow rate and uses this feedback to regulate the brewing process. This closed-loop control ensures high manufacturing precision and consistency in flow rate, unlike manual mechanical systems that rely on operator skill and judgment.
4Stress or pressure
If counter-pressure valve is used to adjust pressure independently, then pressure control improves, but device complexity increases
Solution Approach 1:
The patent makes the counter-pressure valve serve multiple functions: it controls both the brewing chamber pressure and regulates the total flow time. This multi-functionality eliminates the need for separate pressure control and flow time control systems, thereby reducing overall device complexity while maintaining improved pressure control.
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 method produces high-quality, consistent coffee beverages by ensuring that the brewing process maintains a constant total flow time, resulting in improved flavor reproducibility and reduced coffee powder requirements, with coarser grinds sometimes producing better results than fine grinds.
Implementation Method 1
the flow of the brewing water is actively regulated by applying a back pressure by means of an adjustable counter-pressure valve
Implementation Method 2
the brewing water is passed through under pressure
Implementation Method 3
a total quantity of brewing water is passed through a quantity of coffee powder in a brewing process
Data Source
Figure 1~6
Figure 2~2a
Figure 3~5
AI summary
The invention relates to a method for preparing a coffee drink in which, in a brewing process, a predefinable total amount of brewing water is conducted through an amount of powdered coffee. In order to improve the tasting quality of freshly-brewed coffee drinks while, at least, increasing the uniformity of taste characteristics in successively prepared coffee drinks, a total through-flow time for the brewing process is or can be predefined in which the total amount of brewing water is conducted through an amount of powdered coffee.