Twin-Tub Washing Machine Control for Water and Load Conflicts
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Solution Overview
Problem
Conventional twin-tub washing machines face issues with simultaneous operation of washing tubs, leading to insufficient water supply, incomplete drainage, noise due to resonance, and electrical overload during dehydrating or drying processes, which affect efficiency and machine reliability.
Innovation Solution
A method of controlling a twin-tub washing machine that prioritizes operations based on available resources and tub conditions, delaying or sequencing commands to ensure sufficient water supply, complete drainage, and preventing simultaneous heater operations to avoid overload and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water supplying process or draining process is performed in two washing tubs simultaneously, then washing efficiency is improved, but water supply becomes insufficient and drainage becomes incomplete
Solution Approach 1:
The control unit checks whether water supply or drainage is already being performed in one tub before allowing the same operation in another tub. This preliminary check prevents simultaneous operations that would cause insufficient water supply or incomplete drainage, ensuring resource availability before initiating parallel washing processes.
2Productivity
If dehydrating process is performed in two washing tubs simultaneously, then washing efficiency is improved, but noise is generated due to resonance and machine may break
Solution Approach 1:
The control unit checks whether dehydrating is already being performed in one tub before allowing dehydrating in another tub. This preliminary prevention avoids simultaneous high-speed rotation of both drums, eliminating resonance-induced noise and mechanical stress that could lead to machine breakdown.
3Productivity
If water heating process or drying process is performed in two washing tubs simultaneously, then washing efficiency is improved, but electrical overload occurs
Solution Approach 1:
The control unit checks whether water heating or drying is already being performed in one tub before allowing the same operation in another tub. This preliminary check prevents simultaneous activation of multiple high-power heating elements, avoiding electrical overload and potential damage to the electrical system.
4Device complexity
If single water supply pipe and single drain pipe are connected to two washing tubs, then device complexity is reduced, but water supply and drainage cannot be ensured when operated simultaneously
Solution Approach 1:
The control unit performs preliminary checks to determine if water supply or drainage operations are already active in one tub before initiating the same operations in another tub. This control mechanism ensures that even with a single pipe system connecting both tubs, adequate water supply and drainage are maintained by preventing simultaneous operations that would exceed the pipe system's capacity.
Data Source
AI summary
A method of controlling a washing machine having a first washing tub and a second washing tub, the method having the operations: receiving a first operating command to be performed in the first washing tub; determining whether the operating command can be performed; and when the operating command can be performed, performing the operating command in the first washing tub.