Conductivity Sensor Detection of Rinse Additive in Washing Machines

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Solution Overview

Problem

Existing washing machine appliances lack the ability to detect the presence of rinse additives in real-time during a rinse cycle, which hinders the potential for real-time adjustments to improve rinsing capabilities and overall performance.

Innovation Solution

A conductivity sensor is used to measure the conductivity of rinse fluid within the washing machine tub, determining changes in conductivity values to detect the presence of rinse additives, allowing for real-time adjustments to the rinse cycle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conductivity sensor is installed to detect rinse additives in real-time, then rinsing performance is improved, but device complexity increases

Engineering Contradiction:

Improverinsing performanceVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical or optical detection systems with a simple conductivity sensor. The conductivity sensor measures the electrical conductivity of the rinse fluid, which changes when rinse additives are present. This substitution of a sophisticated detection mechanism with a simple electrical measurement resolves the technical contradiction by achieving reliable rinse additive detection without significantly increasing device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If real-time detection of rinse additives is implemented, then adaptability is improved, but measurement precision requirements increase

Engineering Contradiction:

Improvereal-time adjustment capabilityVSAvoidconductivity measurement precision

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent utilizes changes in conductivity parameters to detect the presence of rinse additives. By monitoring how the conductivity parameter changes during the rinse cycle, the system can adaptively adjust rinse parameters without requiring extremely high measurement precision. The approach relies on detecting significant conductivity changes rather than measuring absolute conductivity values with high precision, thus resolving the contradiction between adaptability and measurement precision requirements.

Inventive Principle:

Principle #35Parameter changes

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 real-time detection and adjustment of rinse cycles based on the presence of additives, enhancing the rinsing process by extending soak or agitation times and improving cleaning efficacy.

Implementation Method 1

sensing, with a conductivity sensor, a conductivity measurement of a rinse fluid within a tub of the washing machine appliance

Methodology Applied

Scientific EffectElectrical Conductivity: Conduction (electrical)

Data Source

PatentUS12467186B2Detecting a presence of a rinse additive during a rinse cycle of a washing machine appliance

Publication Date: 2025.11.11 HAIER US APPLIANCE SOLUTIONS INC

AI summary

A method for operating a washing machine appliance includes a step of initiating a rinse cycle of a washing machine appliance. The method also includes a step of sensing, with a conductivity sensor, a conductivity measurement of a rinse 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 rinse additive within the rinse fluid.