Drum washing machine, and control method and apparatus for same
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Solution Overview
Problem
Conventional drum washing machine control methods face issues of collision with the drum during weighing and failure of dehydration, especially with heavy loads or single items like a bath towel or jeans, due to inadequate load balancing 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, preventing collisions and dehydration failures by adjusting the velocity fluctuation threshold based on the current load, thereby ensuring safe operation across varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed velocity fluctuation threshold is used for weighing protection, then the system can prevent drum collision under light loads, but it causes dehydration failure when only one piece of clothes is present under heavy loads
Solution Approach 1:
The patent applies dynamics by making the velocity fluctuation threshold adaptive rather than fixed. The control system dynamically adjusts the threshold based on the measured load weight: when the load is light (below threshold), a first velocity fluctuation threshold is used for weighing protection; when the load is heavy (above threshold), a second velocity fluctuation threshold is used to allow dehydration. This dynamic adjustment resolves the contradiction between weighing protection and dehydration performance under different load conditions
Solution Approach 2:
The patent changes the parameter of velocity fluctuation threshold based on load conditions. By measuring the load weight and comparing it with a preset threshold, the system selects different velocity fluctuation thresholds (first threshold for light loads, second threshold for heavy loads). This parameter change enables the system to maintain weighing protection for light loads while avoiding dehydration failure for heavy loads with single items
2Object-affected harmful factors
If the rotation velocity fluctuation threshold is set to prevent drum collision, then weighing protection is achieved, but the system fails to dehydrate single items like bath towels or jeans
Solution Approach 1:
The system changes the velocity fluctuation threshold parameter based on load weight. For light loads where drum collision risk exists, a conservative first threshold prevents collision. For heavy loads where single items may be present, a more permissive second threshold allows dehydration to proceed. This parameter adaptation resolves the conflict between collision prevention and dehydration efficiency
Solution Approach 2:
The patent applies local quality by treating different load conditions with different protection strategies. Instead of applying a uniform velocity threshold across all conditions, the system applies a stricter threshold locally for light loads and a more lenient threshold locally for heavy loads. This localized approach allows the system to optimize for collision prevention when needed while enabling dehydration when safe
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.