Coffee Machine Flow Detection Using Heater Temperature Difference
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Solution Overview
Problem
Existing coffee machines require multiple components to determine liquid flow, which occupies valuable space and complicates the system.
Innovation Solution
Determine liquid flow by calculating a quotient from the heating power and temperature difference, eliminating the need for a flow meter by using existing temperature sensors and a control device to derive the flow rate through the formula m˙ = Q˙ × c × ΔT, where c is a material constant, and ΔT is the temperature difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flow meter is used to determine liquid flow, then measurement precision is improved, but device complexity increases and more components are required
Solution Approach 1:
The patent extracts the flow measurement function from a dedicated flow meter and relocates it to the control device by implementing a calculation unit that computes flow rate from temperature measurements and heating power data. This eliminates the need for a separate flow meter component while maintaining measurement capability.
Solution Approach 2:
The control device is enhanced to perform multiple functions: it not only controls the heating element and pumps but also calculates liquid flow rate by processing temperature sensor data and heating power information. This multi-functionality consolidates components and reduces system complexity.
2Measurement precision
If multiple components (flow meter, temperature sensors, control device) are used to determine liquid flow, then measurement accuracy is improved, but the space occupied in the coffee machine housing increases
Solution Approach 1:
The patent merges the flow measurement functionality with the existing control device, combining multiple functions (temperature control, heating control, and flow measurement) into a single integrated unit. This consolidation reduces the total component count and frees up space in the coffee machine housing.
Solution Approach 2:
The control device is designed to serve multiple purposes: controlling the heating element, managing pump operations, and calculating flow rate from temperature and power data. This multi-functional approach eliminates the need for separate dedicated components, thereby reducing spatial requirements.
3Measurement precision
If a flow meter is installed in the liquid path, then flow measurement is achieved, but the number of mechanical components increases
Solution Approach 1:
The patent replaces the mechanical flow meter with a computational approach. Instead of using mechanical components that physically interact with the liquid flow, the system uses temperature sensors and a calculation unit to determine flow rate through thermal measurements and power consumption data, thereby eliminating mechanical complexity.
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 simplifies the determination of liquid flow, reducing the number of components needed and allowing for automated calculation, enabling precise control of the liquid pump and flow valve to deliver a defined amount of brewed coffee.
Implementation Method 1
a heater and two temperature sensors upstream and downstream of the heater
Implementation Method 2
carrying out a first temperature measurement of the liquid upstream of the heater, carrying out a second temperature measurement downstream of the heater
Data Source
Figure 1
AI summary
The method involves performing two temperature measurements of a fluid i.e. water (L), upstream and downstream of a heater (7), respectively. A temperature difference is determined from temperatures determined in the temperature measurements. Flow of the fluid is determined by determination of a heating power and a calculation of quotients, representing the flow, from the heating power and the temperature difference multiplied with a specific material constant for the fluid. A fluid pump (19) and/or a flow valve (21) are controlled based on the determined flow of fluid. An independent claim is also included for a coffee machine comprising a heater.