Coffee Bean Hopper Level Sensing to Prevent Mid-Brew Stops
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Solution Overview
Problem
Modern coffee machines face issues with accurately detecting the depletion of coffee beans, leading to unnecessary machine stops, wasted coffee, and increased costs due to complex measurement systems, which are prone to failures and user inconvenience.
Innovation Solution
A capacitive sensor is used to detect the quantity of coffee beans, providing a signal to the user when there is still a sufficient amount for one or more cups, allowing timely refilling and preventing machine stops during brewing cycles, while avoiding the limitations of existing optical and volumetric systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a volumetric system for measuring ground coffee is provided, then the quantity of ground coffee can be controlled, but the costs and size of the machine increase considerably
Solution Approach 1:
The patent extracts the measurement function from the ground coffee and applies it to the coffee beans before grinding. By measuring the volume of whole coffee beans in the container using a simple level sensor, the system avoids the complexity of measuring ground coffee volume, thereby reducing machine size and costs while maintaining measurement capability
Solution Approach 2:
The patent introduces an intermediary measurement approach by measuring coffee beans at a different stage (before grinding) rather than measuring the final ground coffee. This intermediary measurement of whole beans uses simpler technology and provides sufficient information to control the brewing process without requiring complex ground coffee measurement systems
2Measurement precision
If a volumetric measurer is used to control ground coffee quantity, then the coffee quantity can be measured, but the measurer is subjected to failures and represents a critical element
Solution Approach 1:
The patent removes the vulnerable volumetric measurer from the ground coffee path and relocates the measurement function to the coffee bean container. The level sensor measuring whole beans is much more reliable as it operates in a stable environment without exposure to moving ground coffee, vibrations, and moisture that cause failures in ground coffee measurement systems
Solution Approach 2:
The patent implements beforehand cushioning by measuring coffee bean levels in advance before grinding occurs. This prevents the need for critical real-time measurement of ground coffee during the brewing process, eliminating the vulnerability of having a critical measurer in the ground coffee path that could fail during operation
3Reliability
If the machine stops when coffee beans are exhausted during grinding, then the user can be alerted, but the user experience is degraded and productivity is reduced
Solution Approach 1:
The patent performs preliminary action by detecting coffee bean depletion in advance through level sensors in the container, before the beans are actually exhausted during grinding. This allows the system to alert users proactively and enable them to refill beans before the brewing process is interrupted, maintaining productivity and improving user experience
Solution Approach 2:
The patent implements continuous feedback by monitoring coffee bean levels in the container during operation. The level sensors provide real-time information about bean quantity, enabling the control unit to alert users when refilling is needed, creating a closed-loop system that prevents process interruptions and maintains high productivity
4Reliability
If the grinder continues to rotate when coffee beans are depleted, then the machine can detect the unloaded state, but coffee powder is wasted and the cycle must be restarted
Solution Approach 1:
The patent takes preliminary action by monitoring coffee bean levels in the container before and during the grinding process. When the level sensor detects that beans are depleted, the control unit can stop the grinder in advance or prevent the brewing cycle from starting, eliminating the waste of coffee powder that would otherwise be ground from depleted beans
Solution Approach 2:
The patent uses feedback from level sensors to continuously monitor coffee bean availability. This feedback loop enables the control unit to make real-time decisions about grinder operation, stopping the grinding process when beans are depleted and preventing waste, while also providing information to users for timely refilling
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 capacitive sensor effectively alerts users to refill coffee beans before they are completely depleted, ensuring continuous operation and reducing waste, without the need for expensive or unreliable measurement systems.
Implementation Method 1
a capacitive sensor (31) associated to the container (13) of coffee beans
Data Source
AI summary
The machine comprises: a brewing unit (3); a water reservoir (7); a boiler (11) for the production of hot water to supply to the brewing unit; a coffee container (13); an electronic control unit (27); a user interface (33). At least one capacitive sensor (31) is associated to the coffee container to detect the quantity of residual coffee in the container (13). The sensor is connected to the electronic control unit, which is programmed to supply to a user by means of the interface at least a piece of information regarding the quantity of coffee in said container.