Detecting a wash substance during a wash cycle of a washing machine appliance
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Solution Overview
Problem
Washing machine appliances may operate with the wrong wash substance dispensed, leading to reduced performance, as the actual substance may differ from the selected one during the wash cycle.
Innovation Solution
A method and system using conductivity and turbidity sensors to monitor and classify the wash substance in the tub, comparing it to the selected classification, and adjusting the wash cycle accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wash substance classification is preselected by user, then washing machine can operate more effectively, but the actual wash substance may differ from selected classification leading to reduced performance
Solution Approach 1:
The patent implements a feedback mechanism where sensors continuously monitor conductivity and turbidity measurements during the wash cycle, compare actual measurements against expected values for the selected wash substance classification, and provide feedback to the controller. This allows the system to detect mismatches between selected and actual wash substances and adjust operation accordingly, resolving the contradiction by ensuring reliability through active monitoring without requiring complex manual verification procedures
Solution Approach 2:
The patent replaces manual verification of wash substance classification with automated electronic sensing and measurement systems. Conductivity sensors and turbidity sensors substitute for human inspection, using electrical and optical properties to identify wash substance types. This substitution maintains reliability while keeping device complexity manageable through standardized sensing technologies
2Measurement precision
If conductivity and turbidity measurements are monitored continuously, then wash substance classification accuracy is improved, but energy consumption and measurement time increase
Solution Approach 1:
The patent implements periodic measurement cycles where conductivity and turbidity sensors take measurements at specific intervals during the wash cycle rather than continuously. The controller is configured to perform measurements at key stages (e.g., when wash substance is dispensed, during agitation phases) and compare results against reference values. This periodic approach maintains sufficient detection accuracy while significantly reducing energy consumption compared to continuous monitoring
Solution Approach 2:
The patent monitors only the critical parameters (conductivity and turbidity) that are sufficient to identify wash substance classification, rather than measuring all possible properties. By focusing on these two key measurements, the system achieves adequate detection accuracy without the excessive energy cost of comprehensive multi-parameter monitoring
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
Ensures the correct wash substance is used, enhancing the washing machine's performance by accurately detecting and matching the dispensed substance to the user's selection.
Implementation Method 1
monitoring, with a sensor assembly, conductivity measurements and turbidity measurements of the tub
Implementation Method 2
monitoring, with a sensor assembly, conductivity measurements and turbidity measurements of the tub
Data Source
AI summary
A method for operating a washing machine appliance may include a step of activating a wash cycle of the washing machine appliance. The method may also include a step of flowing a fill of liquid water to a tub of the washing machine appliance. The method may further include a step of flowing a wash substance to the tub of the washing machine appliance. The method may also include a step of monitoring conductivity measurements and turbidity measurements of the tub. The method may further include a step of determining a classification of the wash substance flowed to the tub of the washing machine appliance. The method may also include a step of comparing the determined classification of the wash substance to a selected classification of the wash substance.