Washing Machine Conductivity Sensor for Oxygen Bleach Detection
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Solution Overview
Problem
Existing washing machine appliances lack the ability to detect the presence of oxygen bleach in real-time during a wash cycle, which hinders optimal adjustment of wash and rinse cycles for enhanced cleaning performance.
Innovation Solution
A conductivity sensor is used to measure the conductivity of the wash fluid within the washing machine tub, with temperature compensation, to detect the presence of oxygen bleach by comparing conductivity changes against a baseline, allowing for real-time adjustments to the wash and rinse cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conductivity sensor is used to detect oxygen bleach presence in real-time, then cleaning effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex chemical detection methods with a simpler electrical conductivity measurement system. By measuring the conductivity of wash water, the system can detect oxygen bleach presence without requiring complex mechanical or chemical analysis equipment, thus improving cleaning effectiveness while minimizing device complexity
Solution Approach 2:
The patent uses conductivity as an intermediary parameter to indirectly detect oxygen bleach presence. Instead of directly measuring bleach concentration, the system measures the electrical conductivity of the wash water, which changes when oxygen bleach is present, providing a simple yet effective detection mechanism
2Adaptability or versatility
If real-time detection of oxygen bleach is implemented, then wash cycle optimization is improved, but measurement precision requirements increase
Solution Approach 1:
The patent implements a feedback mechanism where conductivity measurements are continuously taken during the wash cycle, and the results are used to automatically adjust wash parameters. The controller compares measured conductivity values against threshold values and modifies wash cycle parameters accordingly, enabling real-time optimization without requiring extremely high measurement precision
Solution Approach 2:
The patent changes the measurement parameter from direct chemical concentration detection to electrical conductivity measurement. This parameter transformation allows for simpler measurements with adequate precision, as conductivity sensors can reliably detect the presence and concentration ranges of oxygen bleach in wash water without requiring ultra-precise measurements
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
Enables automatic adjustment of wash and rinse cycles based on the detection of oxygen bleach, improving cleaning effectiveness and ensuring thorough removal of the bleach from laundry.
Implementation Method 1
sensing, with a conductivity sensor, a conductivity measurement of a wash fluid within a tub of the washing machine appliance
Data Source
AI summary
A method for operating a washing machine appliance includes a step of initiating a wash cycle of a washing machine appliance. The method also includes a step of sensing, with a conductivity sensor, a conductivity measurement of a wash fluid within a tub of the washing machine appliance. The method further includes a step of determining, based on the sensed conductivity measurement and a baseline conductivity measurement, a change in conductivity value. The method also includes a step of detecting, based on the change in conductivity value, a presence of oxygen bleach within the wash fluid.