Coffee Grinder Load Sensing for Accurate Ground Coffee Dosing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional coffee grinder control systems face inaccuracies in ground coffee output due to variations in coffee bean characteristics and manual adjustments required for empty or blocked grinders.
Innovation Solution
A control system for a coffee grinder that includes a load sensor arrangement to measure grinder motor running parameters, such as electrical current or motor speed, and a processor to determine the amount of ground coffee based on these parameters, allowing for precise control and automatic adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the grinder motor operates over a predetermined run-time or revolutions, then the control system is simple to operate, but the ground coffee output becomes inaccurate due to variations in coffee bean characteristics
Solution Approach 1:
The control system continuously monitors the actual ground coffee output and compares it with the target amount, then adjusts the grinder motor run-time based on this feedback to compensate for variations in coffee bean characteristics and achieve accurate dosing
Solution Approach 2:
The system dynamically changes the grinder motor run-time parameter based on detected coffee bean characteristics and actual output measurements, rather than using a fixed predetermined time, to maintain accurate ground coffee output across different bean types
2Device complexity
If the grinder motor operates over a predetermined run-time or revolutions, then the control system requires minimal sensors, but manual adjustment is needed when the grinder is empty or blocked
Solution Approach 1:
The control system automatically detects when the grinder is empty or blocked through sensor monitoring and autonomously adjusts operation or notifies the user, eliminating the need for manual determination and adjustment by the user
3Ease of manufacture
If the control system uses a look-up table with fixed run-time values, then the system is easy to program, but it cannot adapt to different coffee bean characteristics
Solution Approach 1:
The control system transitions from static fixed run-time values in a look-up table to dynamic run-time adjustment based on real-time monitoring of grinder motor parameters and actual ground coffee output, enabling adaptation to different coffee bean characteristics while maintaining a relatively simple control structure
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 system achieves accurate and consistent ground coffee output by accounting for coffee bean characteristics and automatically adjusting for empty or blocked conditions, enhancing the precision and reliability of coffee grinding.
Implementation Method 1
the grinder motor running parameter includes an electrical current for driving the grinder motor during the grinding operation, and the load sensor arrangement includes an electrical sensor, such as a current sensor for measuring the electrical current for driving the grinder motor
Implementation Method 2
the grinder motor running parameter includes a speed of the grinder motor during the grinding operation, and the load sensor arrangement includes a speed sensor for measuring the motor speed of the grinder motor
Data Source
AI summary
There is disclosed herein a control system for a coffee grinder, the coffee grinder comprising a hopper (320) for containing coffee beans from which ground coffee can be dispensed and a grinder motor (340) for grinding the coffee beans contained in the hopper (320), the control system including: a load sensor arrangement (380) for sensing at least one grinder motor running parameter during a grinding operation in which coffee beans in the hopper (320) is ground by the grinder motor (340) to provide ground coffee, the grinder motor (340) running parameter relating to a load experienced by the grinder motor (340) during the grinding operation; and a processor configured to determine, based at least on the grinder motor running parameter from the load sensor arrangement (380), an amount of ground coffee from the hopper (320) during the grinding operation.