Laundry Dryer Soft-Start Drum Control for Pet Hair and Lint Removal
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Solution Overview
Problem
Existing laundry appliances struggle to effectively remove foreign particulates such as pet hair and lint during the drying process, leading to inefficient cleaning and potential re-deposition of these particles on clothing.
Innovation Solution
A laundry appliance equipped with a controller that operates a foreign particulate cycle featuring a soft-start feature, speed modulation routine, and drum rotation routine to gradually increase drum speed, alternate drum direction, and adjust airflow speed, enhancing the removal of foreign particulates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum rotates at high speed from the start, then drying efficiency is improved, but foreign particulates are not effectively removed and may be re-deposited on clothing
Solution Approach 1:
The system performs preliminary action by executing a soft-start routine that gradually increases drum speed before the main drying cycle begins. This preliminary low-speed phase allows foreign particulates to be gently loosened from clothing without being immediately redistributed, preparing the load for effective high-speed drying while minimizing re-deposition risks
Solution Approach 2:
The system applies dynamics by implementing variable drum speed operation with multiple phases: a soft-start phase with gradually increasing speed, a modulation phase with alternating high and low speeds, and a high-speed drying phase. This dynamic speed variation optimizes both particulate removal and drying efficiency at different stages of the cycle
2Reliability
If the drum speed is gradually increased from full stop, then foreign particulates are effectively removed, but drying time is extended
Solution Approach 1:
The system applies periodic action through the drum modulation routine that alternates between high-speed and low-speed phases during the drying cycle. The high-speed phases maximize drying efficiency while the low-speed phases maintain foreign particulate removal effectiveness, creating a periodic pattern that balances both objectives without extending overall cycle time
Solution Approach 2:
The system maintains continuity of useful action by ensuring that foreign particulate removal is an ongoing process throughout the entire drying cycle, not just during the soft-start phase. The modulation routine continuously alternates between speeds that optimize removal and speeds that optimize drying, ensuring both functions are performed continuously rather than sequentially
3Reliability
If the drum alternates rotation direction, then foreign particulates are maximized collected, but energy consumption increases
Solution Approach 1:
The system applies periodic action by implementing alternating drum rotation directions during the modulation phase. The drum rotates in one direction to loosen and remove particulates, then alternates to the opposite direction to prevent re-deposition and enhance collection. This periodic direction reversal maximizes particulate collection efficiency while the controlled frequency of alternation manages energy consumption
Data Source
AI summary
A laundry appliance includes a cabinet having a user interface. A drum is disposed within the cabinet and is operably coupled to a motor that rotates the drum. A blower delivers process air through an airflow path that includes the drum. A controller is communicatively coupled to the user interface, the motor, and the blower. The controller is configured to selectively operate a foreign particulate cycle that includes at least a soft-start feature.