Control method of washing machine
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Washing machines face inefficiencies in heating water during the washing cycle, leading to incomplete detergent dissolution, prolonged washing times, and potential protein pollutant coagulation due to inadequate drum rotation during heating, which affects washing performance.
Innovation Solution
A control method for washing machines that involves a heating washing process followed by a non-heating process, with controlled drum rotation speeds and motions to optimize temperature increase, ensuring enzymes remain vital and preventing protein coagulation by gradually raising the water temperature and promoting effective washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the drum is maintained in a stop state to minimize shaking of washing water during heating, then heating efficiency is improved, but detergent dissolution is incomplete and washing agent attaches to laundry in lump state
Solution Approach 1:
The drum rotation speed is dynamically adjusted during the heating process. Initially, the drum rotates at a first rotation speed to promote detergent dissolution, then transitions to a second rotation speed (lower than the first) to minimize water shaking while maintaining adequate mixing. This dynamic adjustment resolves the contradiction between heating efficiency and detergent dissolution completeness.
2Reliability
If the drum is rotated in one direction during heating, then detergent dissolution is improved, but heating time is delayed due to washing water shaking
Solution Approach 1:
The drum performs periodic bidirectional rotation during heating, rotating in both clockwise and counterclockwise directions. This periodic bidirectional motion enhances detergent dissolution more effectively than unidirectional rotation, while the controlled rotation speed minimizes excessive water shaking, thereby reducing heating time delay.
Solution Approach 2:
The drum rotation speed is dynamically adjusted during the heating process. Initially, the drum rotates at a first rotation speed to promote detergent dissolution, then transitions to a second rotation speed (lower than the first) to minimize water shaking while maintaining adequate mixing. This dynamic adjustment resolves the contradiction between heating efficiency and detergent dissolution completeness.
3Productivity
If washing water temperature is rapidly increased to high temperature, then washing speed is improved, but protein pollutants coagulate and washing effect deteriorates
Solution Approach 1:
The heating process is segmented into multiple temperature stages. The washing machine heats water to a first target temperature (40-60°C) for initial washing, then heats to a second target temperature (60-95°C) for subsequent washing. This segmentation allows enzymes to work effectively at moderate temperatures before high-temperature sterilization, preventing protein coagulation while maintaining washing speed.
Solution Approach 2:
The washing machine changes temperature parameters in a controlled manner, first heating to a moderate temperature range (40-60°C) where enzymes remain active, then gradually increasing to higher temperatures (60-95°C). This parameter change strategy prevents sudden temperature shocks that would cause protein coagulation, while still achieving rapid overall heating and efficient washing.
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 enhances detergent enzyme vitality, optimizes temperature control, and improves washing performance by ensuring complete pollutant removal while minimizing coagulation and washing time.
Implementation Method 1
operating a washing heater
Implementation Method 2
operating a drum in a first motion until a washing water temperature reaches a first set temperature
Data Source
AI summary
In a control method of a washing machine, a washing operation is performed through a heating washing process for a first set time and is performed through a non-heating washing process for a residual time, and, if the heating washing process is started, the rotation of a driving motor is weakly controlled until a washing water temperature reaches a primary target temperature, and is strongly controlled until the washing water temperature reaches a secondary target temperature after the washing water temperature reaches the primary target temperature, so that the washing water temperature is relatively gradually increased.