Method of controlling washing machine
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Solution Overview
Problem
Washing machines experience vibration and noise due to uneven laundry distribution during the dewatering stroke, which existing methods fail to adequately address.
Innovation Solution
A method for controlling a washing machine that uses a vibration sensor to determine the initial and calibration rotational speeds of the drum, adjusting between 40 RPM and 80 RPM to ensure even laundry distribution by analyzing the intersection points of fundamental and higher harmonic vibrations, and performing repeated laundry distributing operations until the distribution is within the allowable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum rotates at high speed during dewatering, then water removal efficiency is improved, but vibration and noise increase due to uneven laundry distribution
Solution Approach 1:
The system performs a laundry distributing operation before the main dewatering stroke by rotating the drum at a low initial speed to evenly distribute the laundry. This preliminary action prevents uneven distribution that would cause vibration and noise during high-speed dewatering, while still achieving efficient water removal in the subsequent high-speed stroke.
2Stability of the object's composition
If the drum rotates at low speed for laundry distribution, then even distribution is achieved, but the dewatering process time increases
Solution Approach 1:
The system dynamically adjusts the drum rotation speed through multiple stages: initially rotating at a low speed (40-80 RPM) to distribute laundry evenly, then detecting the distribution state using vibration sensors, and finally accelerating to high speed for efficient dewatering. This dynamic speed adjustment ensures both even distribution and time-efficient water removal.
3Manufacturing precision
If the drum speed is frequently adjusted for laundry distribution, then distribution accuracy is improved, but the control system complexity increases
Solution Approach 1:
The system uses vibration sensors to detect the distribution state of laundry during and after the distributing operation. The controller analyzes vibration signals to determine whether laundry is evenly distributed, and automatically adjusts the drum speed accordingly. This feedback mechanism achieves accurate distribution control without requiring complex manual intervention or sophisticated control algorithms.
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 effectively reduces vibration and noise by ensuring even laundry distribution, shortening the dewatering process and improving the overall efficiency of the washing machine.
Implementation Method 1
a vibration sensor installed in the tub, and a controller for controlling operation, the method including determining an initial speed in a drainage process after a rinsing stroke is finished, performing a laundry distributing operation in which a rotational speed of the motor is maintained at the determined initial speed, and determining whether a degree of laundry distribution satisfies an allowable range by comparing information detected by the vibration sensor with previously stored reference information
Data Source
AI summary
Washing machine technology, in which an initial speed in a drainage process is determined after a rinsing mode is finished, and a laundry distributing operation is performed in which a rotational speed of the motor is maintained at the determined initial speed. The washing machine determines whether a degree of laundry distribution satisfies an allowable range by comparing information detected by a vibration sensor with previously stored reference information. The initial speed is determined to be a rotational speed of the motor at an intersection time point at which vibration of a fundamental wave and vibration of higher harmonics detected by the vibration sensor intersect with each other.