Coffee Grinder Flow Feedback for Brewing Pressure Control
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Solution Overview
Problem
Existing coffee machines with integrated grinding devices struggle to automatically set the optimal grinding grade due to varying coffee bean consistency and require expensive control systems, leading to potential brewing issues and suboptimal coffee quality.
Innovation Solution
A coffee machine with a flowmeter to measure brewing water flow rate, converting this data into brewing pressure display for user understanding, allowing manual adjustment of grinding grade through a user-friendly interface, ensuring optimal coffee quality without risking blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an automatic control system with dedicated drive is used to adjust grinding grade, then the grinding grade can be automatically modified when preparation time deviates from set value, but the machine becomes too expensive for household use
Solution Approach 1:
The system uses the existing pump motor to perform dual functions: both water delivery and grinding grade adjustment. The microprocessor controls the pump motor to occasionally reverse rotation, using the same mechanical components to adjust the grinder settings, eliminating the need for separate dedicated adjustment mechanisms
Solution Approach 2:
The pump motor is designed to serve multiple purposes: delivering brewing water during normal operation and adjusting the grinding grade by reversing rotation. This multi-functionality reduces the overall system complexity and cost while maintaining automatic control capabilities
2Ease of operation
If a factory-set programmed parameter is used for optimum grinding grade, then the machine is simple to operate, but the grinding result varies due to different coffee bean consistency and roasting degrees
Solution Approach 1:
The system measures the actual preparation time of each beverage and compares it to the expected time. Based on this feedback, the microprocessor automatically adjusts the grinding grade to compensate for variations in coffee bean consistency, roasting degree, and other factors, maintaining optimal brewing conditions without user intervention
Solution Approach 2:
The grinding grade is made dynamically adjustable based on real-time measurements. Instead of a fixed factory setting, the system continuously adapts the grinding parameters based on measured preparation times, allowing the machine to respond to changing conditions in coffee beans and brewing requirements
3Manufacturing precision
If the grinding grade is set too fine, then better extraction and aroma are achieved, but the brewer becomes blocked and the brewing process cancels
Solution Approach 1:
The system uses flow rate measurements to detect partial blockages before they become complete failures. By monitoring the actual water flow through the brewer and comparing it to expected values, the system can identify when grounds are too fine and adjust the grinding grade accordingly, preventing complete blockages while maintaining optimal extraction
4Reliability
If the grinding grade is set too coarse, then blockage risk is reduced, but the brewing water passes through too quickly and coffee taste deteriorates
Solution Approach 1:
The system measures the actual preparation time and flow rate to determine if the grinding grade is too coarse. Based on this feedback, the microprocessor automatically adjusts the grinding grade to achieve the optimal balance between preventing blockages and maintaining adequate contact time for proper extraction and coffee taste
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 users to intuitively set the grinding grade for optimal coffee quality, preventing brewing issues and improving aroma strength by directly correlating flow rate with brewing pressure, thus enhancing the coffee-making process.
Implementation Method 1
the flow rate to the brewing device of the water used for brewing represents a meaningful measure of the desired coffee quality
Data Source
AI summary
A coffee machine (1) having a coffee grinding device (9), a brewing device (5), a brewing water source (7) and a flowmeter (8), which for the user offers a particularly simple setting of the extract content of a coffee beverage. A display device (16) is provided for displaying the flow rate acquired on the flowmeter (8).