Laundry Rinsing Control Using Conductivity-Based Detergent Detection
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Solution Overview
Problem
Conventional laundry machines face challenges in determining the amount of remaining detergent, leading to inefficient rinsing cycles that result in energy waste and unsatisfactory cleaning due to the inability to accurately measure detergent levels.
Innovation Solution
A control method for laundry machines that determines the kind and amount of detergent by measuring conductivity of wash water, adjusting rinsing conditions such as the number of rinsing courses based on the determined detergent type and amount, and compensating for water temperature and hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional laundry machines perform fixed rinsing cycles, then the rinsing process is simple to control, but energy is wasted and cleaning effectiveness is reduced due to inability to measure detergent levels
Solution Approach 1:
The patent replaces complex mechanical measurement systems with electrical conductivity measurement. By using a conductivity sensor to detect detergent concentration and translating chemical properties into electrical signals, the system achieves precise detergent level detection without complex mechanical structures, thereby reducing energy consumption while maintaining control simplicity
Solution Approach 2:
The system enables the laundry machine to automatically determine detergent levels and adjust rinsing cycles based on real-time conductivity measurements. The control unit autonomously decides when to switch between rinsing and spinning modes without user intervention, eliminating energy waste from fixed prolonged rinsing while keeping the control system simple
2Manufacturing precision
If fixed rinsing cycles are used, then the operation is simple, but detergent residue remains and cleaning effectiveness is unsatisfactory
Solution Approach 1:
The patent implements a feedback mechanism where the conductivity sensor continuously monitors detergent concentration during rinsing. The control unit receives real-time conductivity data and adjusts the rinsing cycle duration and intensity accordingly. When conductivity indicates sufficient rinsing (detergent concentration below threshold), the system automatically switches to spinning mode, ensuring thorough cleaning while minimizing unnecessary rinsing time
Solution Approach 2:
The system transitions from static fixed rinsing cycles to dynamic adaptive rinsing. The rinsing cycle parameters (time, water flow rate) are dynamically adjusted based on real-time detergent concentration measurements, allowing the system to optimize cleaning effectiveness for each specific load while reducing overall cycle time
3Measurement precision
If conductivity measurement is used to determine detergent amount, then accurate detergent detection is achieved, but temperature and hardness compensation are required
Solution Approach 1:
The patent performs preliminary measurements of water temperature and hardness before conductivity-based detergent detection. By obtaining these baseline parameters in advance, the system can pre-calculate compensation factors and apply them during the actual detergent measurement process, eliminating the need for complex real-time compensation algorithms and reducing overall system complexity
Solution Approach 2:
The system compensates for temperature and hardness effects by transforming the conductivity measurement into a standardized detergent concentration value. The control unit applies correction algorithms that adjust raw conductivity readings based on measured temperature and hardness parameters, converting variable conditions into consistent measurement results without requiring additional physical sensors or complex hardware
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 method ensures optimal washing and rinsing patterns, reducing energy consumption and detergent residue, thereby improving the efficiency and effectiveness of the laundry process.
Implementation Method 1
a conductivity sensor that measures conductivity of water
Implementation Method 2
The measured conductivity may be compensated according to the temperature of wash water
Data Source
AI summary
A control method of a laundry machine comprising a water supply, washing and rinsing cycle, the control method includes first determination step performed prior to the rinsing cycle and determining a kind of detergent, second determination step performed during a first rinsing course of the rinsing cycle and determining an amount of remained detergent in a rinsing water, and condition determination step of at least one following rinsing course based on the kind and amount of the remained detergent.