Washing Machine Calibration Cycle for Sensor Accuracy
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Solution Overview
Problem
Existing washing machine appliances face challenges in accurately detecting fluid qualities such as pressure and temperature, leading to inefficient operation due to inaccurate sensor readings.
Innovation Solution
A method and system for improved calibration of washing machine sensors, involving a calibration cycle that initializes a fill sequence, determines supply connection orientations, measures water volumes and flow rates, and updates operational parameters based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor calibration is performed manually, then measurement precision can be improved, but ease of operation deteriorates due to requiring user intervention
Solution Approach 1:
The system performs self-calibration by automatically detecting supply connection orientations and measuring water flow rates and temperatures without requiring user intervention. The controller executes calibration routines that fill the tub with water from each supply line, measure the characteristics, and update operational parameters autonomously.
Solution Approach 2:
The calibration process is performed preliminarily before normal washing operations to establish accurate baseline measurements. The system proactively calibrates sensors and detects supply line characteristics in advance, ensuring measurement precision is established before actual use.
2Productivity
If operational parameters are not calibrated, then ease of operation is maintained, but productivity deteriorates due to inefficient washing machine operation
Solution Approach 1:
The calibration process merges multiple measurement functions into a single integrated routine. The controller simultaneously measures flow rates, temperatures, and supply connection orientations during one calibration cycle, reducing the overall complexity despite the comprehensive nature of the calibration.
Solution Approach 2:
The system uses feedback from sensor measurements during calibration to automatically adjust and update operational parameters. The controller receives measurement data and uses it to optimize washing machine operation, creating a closed-loop system that improves productivity through automated parameter optimization.
3Measurement precision
If supply connection orientation is not detected, then device complexity is reduced, but measurement precision deteriorates leading to inaccurate temperature and flow rate readings
Solution Approach 1:
The system replaces complex mechanical orientation detection mechanisms with sensor-based detection. The controller uses temperature sensors and flow rate measurements to infer supply connection orientations, substituting physical detection with electronic sensing and computational analysis.
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 proposed solution enhances the accuracy of sensor readings, leading to improved operational efficiency, fluid efficiency, and reduced user intervention for correcting valve usage and temperature accuracy.
Implementation Method 1
measuring a volume of water from a hot water supply valve before reaching a predetermined temperature threshold
Implementation Method 2
measuring flow rates of water from the hot water supply valve and a cold water supply valve
Data Source
AI summary
A method is for a fill cycle calibration in a washing machine appliance. The method includes receiving an activation signal of a calibration cycle, and performing the calibration cycle. The calibration cycle includes initializing a fill sequence of the washing machine appliance, determining a supply connection orientation of a hot water supply hose and a cold water supply hose, measuring a volume of water from a hot water supply valve before reaching a predetermined temperature threshold, measuring flow rates of water from the hot water supply valve and a cold water supply valve, and updating operational parameters of the washing machine appliance.