Coffee machine with dynamic flow and temperature control
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Solution Overview
Problem
Traditional coffee machines face challenges in maintaining precise temperature and flow control due to fixed-pressure systems, leading to inconsistent brewing results and inefficiencies, while in-line heaters are impractical for fixed-pressure systems and large boilers require significant energy and maintenance.
Innovation Solution
A coffee machine with in-line heating elements and a syringe pump for precise flow control, allowing dynamic temperature adjustments and direct control of flow rate, eliminating the need for a boiler and reducing the machine's footprint and maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a traditional boiler is used to maintain water temperature, then temperature stability is improved, but the machine footprint and energy consumption increase
Solution Approach 1:
The patent extracts the heating function from a traditional large boiler system and implements it through compact in-line heating elements integrated into the water delivery system. This allows temperature control to be applied only where and when needed, eliminating the energy waste of maintaining large volumes of water at temperature continuously.
Solution Approach 2:
The system dynamically adjusts heating based on real-time flow rate measurements and temperature sensor feedback. The heating element modulates its output to match the actual water flow conditions, providing precise temperature control only during active brewing, rather than continuously maintaining temperature in a large boiler.
2Temperature
If a large boiler is used to maintain temperature, then temperature control capability is improved, but the time required to change temperature increases
Solution Approach 1:
The heating function is extracted from a large thermal mass (boiler) and relocated to compact in-line heating elements. This dramatically reduces the thermal mass that must be heated or cooled, enabling rapid temperature changes between different brewing profiles.
Solution Approach 2:
The system uses dynamic feedback control with temperature sensors and variable power delivery to the heating elements, allowing rapid adaptation to different temperature requirements. The electronic control can instantly adjust heating power based on flow rate and desired temperature profile.
3Device complexity
If a fixed-pressure pump is used, then system simplicity is improved, but flow rate control precision deteriorates
Solution Approach 1:
The system implements feedback control by measuring actual flow rate with sensors and using this information to dynamically adjust heating power. This closed-loop approach compensates for variations in coffee resistance and maintains precise temperature control despite flow rate changes.
Solution Approach 2:
The system changes operational parameters dynamically - adjusting heating power based on measured flow rate and temperature conditions. This allows the fixed-pressure pump to operate simply while the control system compensates for flow variations through parameter adjustment.
4Area of stationary object
If in-line heating elements are used, then device footprint is reduced, but temperature control precision deteriorates due to unknown flow rate
Solution Approach 1:
The system integrates multiple functions into the control module: flow rate measurement, temperature sensing, heating power calculation, and actuation control. This multi-functional approach enables precise temperature control in a compact form factor by combining sensing and control functions that would otherwise require separate systems.
Solution Approach 2:
Real-time feedback from flow sensors and temperature sensors enables the control system to calculate the required heating power dynamically. The system continuously monitors actual conditions and adjusts heating output to maintain precise temperature control despite variations in flow rate.
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
The system provides superior temperature and flow control, enabling a wide range of brewing options and reducing energy consumption and maintenance costs, while maintaining consistent brewing quality.
Implementation Method 1
a first in-line heating element to heat the water to an intermediate temperature
Implementation Method 2
a second in-line heating element to heat the water from the intermediate temperature to the temperature set point during an extraction process
Data Source
AI summary
A coffee machine is provided. The coffee machine may include a water line configured to supply water, a pump configured to pressurize the water, a first in-line heating element configured to heat the water to an intermediate temperature, a second in-line heating element configured to heat the water from the intermediate temperature to a temperature set point during an extraction process, and one or more electronic control modules configured to receive brewing settings, the brewing settings including the at least one temperature set point, estimate, based partially on the intermediate temperature, a flow rate of the water through the first in-line heating element, and adjust, based at least partially on the estimated flow rate, a power provided to the second in-line heating element.