Drum Washer Load-Adaptive Thresholds for Weighing Protection
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Solution Overview
Problem
Conventional drum washing machine control methods result in collisions with the drum during weighing and failure of dehydration for single items due to inherent defects in load imbalance detection and velocity fluctuation thresholds.
Innovation Solution
A control method and apparatus that acquire the average starting power of the drum to determine the load range and set a corresponding velocity fluctuation threshold for weighing protection, avoiding collisions and dehydration failures by adjusting the threshold based on the current load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed velocity fluctuation threshold is used for weighing protection, then the protection is simple to implement, but it causes drum collision under heavy loads or dehydration failure for single items
Solution Approach 1:
The patent applies dynamics by making the velocity fluctuation threshold adaptive rather than fixed. The control device dynamically adjusts the threshold based on the measured load weight, using different thresholds for different load conditions. This resolves the contradiction by enabling both ease of implementation (through automated adaptation) and reliability (through condition-specific thresholds that prevent both drum collision and dehydration failure).
Solution Approach 2:
The patent changes the parameter of velocity fluctuation threshold based on load conditions. By measuring the actual load weight and selecting appropriate threshold values from predefined ranges, the system adapts the protection parameter to match operational conditions. This resolves the contradiction by allowing simple implementation (parameter selection based on load) while achieving high reliability (appropriate thresholds for each condition).
2Reliability
If the velocity fluctuation threshold is set to prevent drum collision, then safety is improved, but dehydration fails for single items due to overly restrictive threshold
Solution Approach 1:
The patent changes the velocity fluctuation threshold parameter based on load weight. For heavy loads, a lower threshold prevents drum collision, while for light loads (single items), a higher threshold allows dehydration to proceed. This resolves the contradiction by making the threshold adaptive to load conditions, ensuring both safety and productivity are maintained across different operating scenarios.
Solution Approach 2:
The system dynamically adjusts the protection threshold based on real-time load measurement. The control device selects different threshold values from predefined ranges according to the measured load weight, enabling the system to be restrictive when necessary (heavy loads) and permissive when appropriate (light loads). This resolves the contradiction between safety and productivity through dynamic adaptation.
3Object-affected harmful factors
If a low velocity fluctuation threshold is used, then drum collision is prevented, but the system fails to dehydrate single items like towels or jeans
Solution Approach 1:
The patent changes the velocity fluctuation threshold parameter based on the measured load weight. For heavy loads where drum collision is a risk, a lower threshold is applied. For light loads (single items), a higher threshold is used to allow dehydration. This resolves the contradiction by making the threshold adaptive, preventing drum collision when necessary while enabling single item dehydration when appropriate.
Solution Approach 2:
The system dynamically selects the velocity fluctuation threshold based on real-time load measurement. The control device adjusts the threshold value according to the measured load weight, enabling the system to prevent drum collision for heavy loads while allowing single item dehydration for light loads. This resolves the contradiction through dynamic parameter adaptation.
Data Source
AI summary
A drum washing machine, and a control method and a control apparatus for same are provided. The control method for the drum washing machine comprises the following steps: acquiring an average starting power of a drum in a starting process of the drum; acquiring a load range to which a current load of the drum belongs according to the average starting power; and setting a weighing protection velocity fluctuation threshold according to the load range to which the current load of the drum belongs. A value of the current load is obtained by using a correspondence between load with different weights and average starting powers. A weighing protection velocity fluctuation threshold is set according to the value of the current load to avoid the collision with the drum and non-dehydration in case of only one piece of clothing.