Espresso Machine Flow Control to Reduce Shot-to-Shot Variability
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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 bean selection, and humidity, resulting in wasted coffee and time as baristas adjust settings to achieve desired shot quality.
Innovation Solution
A method and system that dynamically control water flow rates during pre-infusion and extraction, using pre-infusion and extraction tables to adjust flow rates based on puck permeability, pressure, and user inputs, ensuring consistent shot quality by maintaining controlled pressure and flow rates across shots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressure control and pressure profiles are used to indirectly control water flow, then the system can operate with simple hardware, but shot consistency deteriorates due to inability to accommodate puck variations
Solution Approach 1:
The patent replaces the mechanical pressure control system with an electronic flow control system. A flow control device with electronic actuator directly regulates water flow rate through the coffee puck, substituting the indirect mechanical pressure-based control with direct electronic flow management. This enables precise flow regulation that accommodates puck variations while maintaining operational simplicity.
Solution Approach 2:
The patent changes the control parameter from pressure to flow rate. By directly controlling and measuring water flow rate through the puck rather than controlling pressure indirectly, the system can dynamically adjust to puck permeability variations. The flow control device responds to flow rate measurements and adjustments, providing consistent shots despite puck variations.
2Reliability
If baristas manually adjust grinder settings to achieve desired shot quality, then shot quality can be optimized, but time and coffee are wasted during the dialing process
Solution Approach 1:
The patent implements a self-adjusting system where the flow control device automatically compensates for puck variations without requiring manual barista intervention. The system measures actual flow rate through the puck and dynamically adjusts the electronic actuator to maintain target flow rate, enabling consistent shots without the time-consuming manual dialing process.
Solution Approach 2:
The patent incorporates a feedback loop where a flow sensor continuously measures water flow rate through the coffee puck, and this measurement is fed back to the control system. The controller compares actual flow rate with target flow rate and adjusts the electronic actuator accordingly, creating a closed-loop system that automatically maintains optimal extraction without manual intervention.
3Reliability
If baristas monitor shot parameters to determine when to stop extraction, then shot quality can be controlled, but barista attention is occupied during the shot
Solution Approach 1:
The patent implements automatic shot termination where the flow control device and controller system autonomously manages the entire extraction process. The system monitors flow rate, maintains target parameters through electronic control, and automatically stops the shot when completion criteria are met, freeing the barista to perform other tasks without compromising shot quality control.
Solution Approach 2:
The patent uses continuous feedback from flow sensors and pressure sensors to automatically monitor extraction progress. The controller system processes sensor data in real-time and automatically adjusts flow control and determines shot completion, eliminating the need for manual barista monitoring while maintaining precise quality control throughout the extraction process.
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.