Espresso Flow Control for Consistent Shots Across Puck Variations
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Solution Overview
Problem
Existing espresso machines lack the ability to accommodate variations in coffee puck characteristics, leading to inconsistent espresso shots due to factors like grinder performance, coffee dose, tamping force, bean selection, and humidity, resulting in inconsistent volume, crema quality, and flavor.
Innovation Solution
A method and system that dynamically control the flow rate of water during pre-infusion and extraction, using a Pre-Infusion Table and Extraction Table to adjust flow rates based on puck permeability, pressure, and user inputs, ensuring consistent shots by maintaining precise control over water flow and pressure across the puck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure control and pressure profiles are used to extract coffee, then the extraction process can be performed, but the system cannot accommodate variations in coffee puck characteristics leading to inconsistent shots
Solution Approach 1:
The system measures actual flow rate through the puck and uses this feedback to dynamically adjust pump pressure, allowing the system to adapt to variations in puck permeability and maintain consistent extraction despite changes in coffee characteristics
Solution Approach 2:
The system transitions from static pressure profiles to dynamic flow rate control, where the pump continuously adjusts pressure based on real-time flow measurements to maintain target flow rates despite varying puck conditions
2Reliability
If the barista manually monitors shot color, time and volume to determine when to stop, then shot quality can be controlled, but the barista's time is occupied and efficiency decreases
Solution Approach 1:
The system automatically monitors flow rate and shot parameters, and can automatically stop the extraction when target conditions are met, eliminating the need for continuous barista monitoring and freeing them to perform other tasks
Solution Approach 2:
The system replaces manual visual monitoring and decision-making with automated electronic sensors and control algorithms that objectively measure and respond to shot parameters
3Loss of time
If volumetric dosing is used to stop the machine after a programmed water volume, then the endpoint can be controlled, but the system does not control how water moved through the puck resulting in inconsistent extraction
Solution Approach 1:
The system pre-establishes target flow rates and extraction parameters before the shot begins, then continuously measures and adjusts actual flow to match targets, ensuring consistent extraction quality while controlling shot timing
Solution Approach 2:
The system uses real-time flow rate measurements to adjust pressure during extraction, ensuring water moves through the puck at controlled rates for consistent extraction, rather than simply stopping after a fixed volume
4Manufacturing precision
If the grinder is adjusted multiple times to dial in the shot weight, then the desired shot weight can be achieved, but coffee and time are wasted
Solution Approach 1:
The system determines optimal grinder settings and extraction parameters in advance through automated profiling, allowing baristas to consistently reproduce successful shots without repeated trial-and-adjustment cycles that waste coffee
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 results in repeatable brewing environments, reducing the impact of puck permeability variations and grinder settings, minimizing channeling, and maintaining consistent shot weights and times, thereby reducing waste and improving barista efficiency.
Implementation Method 1
controlling a flow rate of water through the puck during pre-infusion and/or extraction
Data Source
AI summary
An espresso brewing system to dynamically control the flow rate of water during pre-infusion and extraction to improvement shot consistency. Simple user controls create a programmatic “brewing environment” which allows shots to be very repeatable and shared, allowing shots to be reproduced on other machines with this system.