Coffee Machine Fan Control for Chaff Separation Air Volume Accuracy
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Solution Overview
Problem
Coffee machines face difficulties in achieving the target air volume for separating waste such as chaff from ground coffee beans, which affects the quality of the coffee beverage.
Innovation Solution
A coffee machine equipped with a grinder, a fan, and a control unit that adjusts the fan motor's rotation speed using PWM control to maintain an air volume close to the target, with a storage unit to save and apply correction values for consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fan is used to generate wind pressure to separate waste from ground beans, then waste separation is achieved, but the air volume may deviate from the target air volume
Solution Approach 1:
The control unit acquires information related to the rotation speed of the fan motor, corrects the PWM value based on the acquired information, and controls the rotation of the fan motor according to the corrected PWM value. This feedback mechanism ensures the air volume matches the target air volume for effective waste separation.
Solution Approach 2:
The system adjusts the PWM duty ratio parameter based on acquired rotation speed information to correct the fan motor's performance. By changing this control parameter, the air volume is optimized to achieve target separation effectiveness.
2Measurement precision
If PWM control is used to adjust fan motor rotation speed, then air volume control is improved, but system complexity increases
Solution Approach 1:
The control unit automatically acquires rotation speed information, corrects PWM values, and adjusts fan motor control without manual intervention. The storage unit updates and stores correction PWM values, enabling the system to self-regulate and maintain precise air volume control.
Solution Approach 2:
The system replaces manual mechanical adjustment with electronic PWM control and automated feedback mechanisms. This substitution reduces the need for complex mechanical control components while achieving precise air volume regulation.
3Stability of the object's composition
If correction values are stored and applied across power cycles, then consistent performance is achieved, but data storage requirements increase
Solution Approach 1:
The storage unit retains correction PWM values across power cycles, recovering the optimized settings after each shutdown. This allows the system to maintain consistent performance without storing extensive operational data, only the essential correction values.
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 coffee machine effectively brings the air volume for separating waste close to the target, ensuring improved coffee quality by efficiently removing chaff and other impurities.
Implementation Method 1
a fan configured to generate a wind pressure by rotating to separate waste from the ground beans ground by the first grinder
Data Source
AI summary
A coffee machine including a grinder configured to grind coffee beans, and a coffee machine devised to be able to bring an air volume for separating waste such as chaff as close as possible to a target air volume. A first grinder configured to grind coffee beans; a fan configured to generate a wind pressure by rotating to separate waste from the ground beans ground by the first grinder; a fan motor configured to cause the fan to rotate; and a control unit configured to control rotation of the fan motor according to a set value, and the control unit acquires information (the number of rotation pulses) related to a rotation speed of the actually rotating fan motor, corrects the set value based on the acquired information, and controls the rotation of the fan motor according to the corrected set value.