Beverage Machine Pump Control Using Microphone and Flowrate Feedback
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Solution Overview
Problem
Beverage preparation machines with pumps of identical design produce beverages with significantly different characteristics due to manufacturing and assembly tolerances, resulting in inconsistent noise levels and flow rates, which affects the quality of the beverages.
Innovation Solution
A machine equipped with an electric flowrate sensor, a power variator device, and a microphone sensor that adjusts the electric power supplied to the pump based on noise and flowrate data to maintain consistent beverage production, reducing noise levels and flow rate variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pumps of identical design are used in beverage preparation machines, then manufacturing and assembly are simplified, but manufacturing and assembly tolerances cause significant variations in noise levels and flow rates
Solution Approach 1:
The system uses a microphone sensor to detect pump noise and a flow rate sensor to measure actual flow, then feeds this information back to the control unit which adjusts pump power dynamically. This closed-loop feedback system compensates for manufacturing tolerances by continuously adapting pump operation to actual performance, resolving the contradiction between easy manufacturing and consistent precision.
Solution Approach 2:
The control unit dynamically changes the electrical parameters (power, voltage, current) supplied to the pump based on real-time feedback from sensors. By varying these parameters, the system compensates for manufacturing variations in individual pumps, allowing identical pumps to operate at optimized performance levels despite tolerance differences.
2Device complexity
If standard pumps are used without adjustment, then device complexity is reduced, but noise levels vary significantly affecting beverage quality
Solution Approach 1:
The microphone sensor continuously monitors pump noise and provides feedback to the control unit, which adjusts pump power to maintain noise within acceptable ranges. This feedback mechanism allows the use of simple standard pumps while compensating for noise variations through dynamic power adjustment.
Solution Approach 2:
Instead of using mechanically adjusted pumps or complex noise-dampening mechanisms, the system substitutes mechanical adjustment with electronic power control. The control unit modulates electrical power to the pump motor, replacing mechanical tuning with electronic regulation, thereby reducing overall device complexity while controlling noise.
3Manufacturing precision
If pump power is increased to compensate for low flow rate, then flow rate consistency improves, but noise levels increase
Solution Approach 1:
The dual-sensor system (flow rate sensor and microphone) provides comprehensive feedback to the control unit, which balances flow rate and noise considerations when adjusting pump power. The control algorithm optimizes power delivery to achieve target flow rates while keeping noise within acceptable limits, preventing the simple solution of increasing power at the expense of noise.
Solution Approach 2:
The system dynamically adjusts pump power in real-time based on actual performance rather than using fixed high-power settings. By continuously adapting power levels to match actual flow rate needs and noise constraints, the system achieves consistent flow without unnecessarily increasing noise, transforming a static high-power approach into a dynamic optimized approach.
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 machine ensures consistent beverage characteristics and reduced noise levels by dynamically adjusting the electric power to the pump, addressing the issues of manufacturing tolerances and improving the organoleptic properties of the beverages.
Implementation Method 1
a microphone sensor (20) which is designed to provide signals indicating the loudness of the noise generated, during operation, by the machine (1) and, primarily, by the pump (4)
Implementation Method 2
an electric pump (4) which is designed to generate a liquid flow (3)
Data Source
AI summary
A machine for the preparation of beverages, including a brewing assembly (10) adapted to receive an amount or dose of a substance (11) for preparing a beverage, a pump (4) provided with an electric motor (8) for pumping a flow of liquid towards and through the brewing assembly (10); a flowrate detector (6) associated with the pump (4); a microphone sensor (20) adapted to provide electric signals indicating the loudness of the noise generated by the machine (1) during operation, and control circuits (ECU, 15) connected to the microphone sensor (5), the flowrate detector (6) and the pump (4) and designed to activate the pump (4) for preparation of a beverage depending on the signals provided by the microphone sensor (20) and by the flowrate detector (6).