Vacuum Cleaner Bag Fill Display Using Validated Pressure Sensing
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Solution Overview
Problem
Existing methods for displaying the filling level of a dust bag in a vacuum cleaner are inaccurate due to dependence on blower power and suction nozzle position, leading to deviations from the actual filling level, and require user effort to set up correctly.
Innovation Solution
A method that determines the differential pressure across the dust bag, checks it against a validity criterion, and uses statistical characteristics like standard deviation to eliminate interference, along with an assignment matrix to account for blower power and additional parameters, to provide a precise filling level indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential pressure is repeatedly determined across the dust bag to display filling level, then the filling level can be monitored continuously, but the measurement is affected by interference factors such as blower power and suction nozzle position causing deviation from actual filling level
Solution Approach 1:
The system continuously monitors differential pressure and compares it against validity criteria (standard deviation thresholds). When measurements fall outside acceptable ranges indicating interference, the system automatically identifies and excludes these invalid measurements, maintaining accurate filling level display without user intervention.
Solution Approach 2:
The system dynamically evaluates the statistical characteristics (standard deviation) of differential pressure measurements to detect changes in operating conditions. By identifying when parameters deviate from normal ranges, the system can distinguish between genuine filling level changes and measurements affected by external factors like blower power variations or nozzle position changes.
2Device complexity
If differential pressure measurement is used to determine filling level, then a simple measurement principle is applied, but special situations such as blockages or dust bag changes cannot be detected
Solution Approach 1:
The system continuously monitors differential pressure patterns and compares them against expected ranges. When measurements fall outside validity criteria or show abnormal patterns, the system automatically detects special situations such as blockages or dust bag changes and can display appropriate warnings to the user.
Solution Approach 2:
The system performs additional validation checks beyond simple differential pressure measurement by evaluating statistical characteristics and comparing against multiple criteria. This extra layer of analysis enables detection of special situations while maintaining the overall simplicity of the measurement principle.
3Measurement precision
If the vacuum cleaner output is set to maximum and suction nozzle is lifted off the surface for accurate measurement, then filling level accuracy is improved, but user effort and complexity of operation increase
Solution Approach 1:
The system automatically performs the function of identifying and excluding invalid measurements caused by interference factors. Instead of requiring the user to manually set the vacuum to maximum output or lift the nozzle, the system self-corrects by detecting when measurements are affected by these factors and excluding them from the filling level calculation.
Solution Approach 2:
The continuous monitoring and validity criterion evaluation enables the system to automatically adapt to varying operating conditions. The system feedback mechanism identifies when the vacuum is operating under suboptimal conditions and compensates by excluding those measurements, eliminating the need for user intervention to maintain accuracy.
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
This approach provides a continuous and accurate display of the dust bag's filling level, reduces interference from blower power and suction nozzle position, and detects special events like blockages, allowing for timely dust bag changes.
Implementation Method 1
a differential pressure across the dust bag is repeatedly determined in particular
Data Source
AI summary
Method for displaying the degree of filling of a dust bag and control device for carrying out the method A method for determining the degree of filling of a dust bag (12) in a vacuum cleaner (10) is specified, a differential pressure across the dust bag (12) being determined at least repeatedly, the differential pressure is checked using a validity criterion and the fill level is determined on the basis of the differential pressure value if the validity criterion is met, a control device (40) for a vacuum cleaner (10) with a memory (42) and a processing unit (44), wherein in the memory (42) program code instructions for implementing the method are stored and wherein the processing unit (44) causes a control of a dust bag fill level display (46) according to the determined fill level during operation when the program code instructions are executed.