Oscillating Piston Pump Control for Distinct Acoustic Feedback
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Solution Overview
Problem
Beverage preparation devices, such as those using oscillating piston pumps, generate disturbing sound patterns due to the rhythmic operation, which can be perceived as noise and are not differentiated by users for various functions, potentially leading to operational errors like consuming undrinkable liquids during descaling.
Innovation Solution
A control unit regulates the energy supply to oscillating piston pumps, modifying the voltage and current patterns to generate distinct sound images for different beverage preparation programs and maintenance functions, allowing users to identify operations acoustically without visual contact, using existing components like the control unit and pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump operates with standard AC mains frequency, then the pump delivers liquid efficiently, but it generates disturbing sound patterns that are perceived as noise
Solution Approach 1:
The patent applies periodic action by controlling the pump to operate at variable frequencies that are not synchronized with the AC mains frequency. The control unit adjusts the pump's operating frequency dynamically during different beverage preparation phases, creating periodic motion patterns that generate less perceptible noise while maintaining liquid delivery efficiency.
Solution Approach 2:
The patent changes the operational parameters of the pump by varying its frequency of operation. The control unit modifies the pump's operating frequency based on the preparation phase (e.g., lower frequency during filling, higher frequency during brewing), thereby optimizing both productivity and noise characteristics at different operational stages.
2Device complexity
If the pump uses a single operating frequency, then the device structure is simple, but users cannot distinguish between different beverage preparation functions acoustically
Solution Approach 1:
The patent uses distinct periodic frequency patterns for different beverage preparation functions. Each function (espresso, filter coffee, cappuccino, etc.) is associated with a specific frequency pattern or sequence of frequencies, allowing users to identify the current function acoustically without additional indicators.
Solution Approach 2:
The control unit changes the pump's operating frequency parameter according to the selected beverage preparation function. By assigning characteristic frequency patterns to different functions, the system provides acoustic feedback that helps users understand what operation is currently active, eliminating the need for visual displays or additional complexity.
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 solution enables clear acoustic differentiation between beverage preparation and maintenance functions, preventing operational errors by generating recognizable sound patterns that can serve as warnings, such as an unpleasant sound for descaling, without requiring additional sound generators or modifications.
Implementation Method 1
the piston of which can be actuated via a magnetic coil that can be switched by the control unit
Data Source
Figure 1
Figure 2~3
AI summary
The device i.e. coffee machine (10), has an oscillating piston pump (20) conveying fluids for preparing beverages, and a controller (40) electrically connected to the pump and a power supply. The supply controls or regulates the pump, and a regulating or controlling unit regulates or controls supply voltage through the controller during generation of a sound pattern associated with program in an operation of the pump. The controller generates various timing patterns during the pump operation and generates a frequency pattern by an active switching of half waves of alternating voltage.