Coffee Reservoir Level Sensing for Accurate Single-Serve Dosing
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Solution Overview
Problem
Existing mechanisms for sensing liquid levels in reservoirs, such as those in coffee makers, are inadequate for accurately determining water volume before brewing, which affects coffee dosing and brew parameters.
Innovation Solution
The implementation of a level sensing mechanism that utilizes temperature monitoring of the outlet from a heating mechanism, conductivity of water, and a pivoting float mechanism with optical sensors to determine liquid levels, allowing for precise water volume measurement and single serve functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional level sensing mechanisms are used in reservoirs, then the structure is simple, but the measurement precision of water level is insufficient
Solution Approach 1:
The patent replaces conventional mechanical level sensing mechanisms with optical sensing. The optical sensor detects the position of the float through light transmission without mechanical contact, eliminating the need for direct mechanical connection while improving measurement precision and reducing mechanical wear.
Solution Approach 2:
The patent introduces an optical intermediary (light) between the float and the detection system. The float's position is translated into optical signal variations that can be precisely measured, allowing indirect but accurate measurement of water level without direct sensor contact with the liquid.
2Measurement precision
If temperature monitoring of heating outlet is used, then water volume determination becomes accurate, but the device complexity increases
Solution Approach 1:
The heating system's temperature monitoring capability is utilized for dual purposes: both for heating control and for water volume determination. The same temperature sensor that monitors heating effectiveness also provides data for calculating remaining water volume, eliminating the need for a separate level sensing system.
Solution Approach 2:
The patent uses changes in temperature parameters at the heating outlet to infer water volume. As water is consumed, the temperature profile during heating changes predictably, allowing volume determination through thermal analysis without direct level measurement.
3Measurement precision
If conductivity-based level sensing is implemented, then measurement capability is improved, but ease of manufacture decreases
Solution Approach 1:
The system uses the water's own electrical conductivity property for sensing without requiring external calibration or complex setup. The conductivity measurement leverages the natural electrical properties of water to determine level, making the system inherently self-calibrating and easier to manufacture despite the advanced sensing capability.
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
Enables accurate water level detection, enabling optimal coffee dosing and brew parameters, and allows for single serve functionality by determining the water level in the reservoir, ensuring the right amount of water is dispensed for each brewing task.
Implementation Method 1
The water level, and hence the water volume, can be determined by monitoring the change in the temperature of water discharged from the heating mechanism
Implementation Method 2
a pivoting float mechanism and optical sensors for measuring the angular displacement of the float
Implementation Method 3
a level sensing mechanism that makes use of the conductivity of water
Data Source
AI summary
A coffee machine has a single serve function that utilizes a reservoir level sensing mechanism so that a single serve dose of water can be dispensed into the grounds regardless of the water level in the machine's reservoir.