Washing Machine Pump Speed Control for Synchronized Dual-Nozzle Spray
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Solution Overview
Problem
Existing washing machine technologies fail to accurately control the spray time of direct water nozzles in relation to the rotation speed of the drum and circulation pump, leading to inconsistent spray patterns when both circulation and direct water nozzles are used simultaneously.
Innovation Solution
A method that controls the rotation speed of the pump during drum rotation to spray water in a preset pattern, using a spray valve to regulate the direct water nozzle based on the pump's rotation speed, ensuring a uniform spray form when both circulation and direct water nozzles are activated simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the circulation pump operates without controlling the flow rate or rotation speed, then the washing machine can perform basic water circulation, but the spray form cannot be controlled constantly and spray time of direct water nozzle cannot be controlled accurately
Solution Approach 1:
The pump control system transitions from static operation to dynamic control, where the pump's rotation speed is adjusted in real-time based on drum rotation phase. The controller modulates the pump motor speed to synchronize water spraying with specific drum positions, enabling precise control of spray form and timing without requiring complex mechanical modifications to the pump structure itself.
Solution Approach 2:
The system changes the operational parameters of the pump by controlling its rotation speed variable. By adjusting the pump speed parameter dynamically during different phases of drum rotation, the system achieves accurate control over spray timing and pattern. This parameter-based control allows the direct water nozzle to spray at precisely controlled intervals synchronized with drum movement.
2Manufacturing precision
If water is sprayed through both circulation nozzle and direct water nozzle simultaneously without coordinated control, then water supply is充足, but the spray form varies and cannot be controlled constantly
Solution Approach 1:
The control system implements feedback by continuously monitoring drum rotation position and using this information to regulate pump operation timing. The controller receives feedback about drum phase and adjusts pump activation accordingly, ensuring that direct water nozzle spraying is synchronized with circulation nozzle operation. This closed-loop control maintains consistent spray form by coordinating both nozzles based on real-time drum position feedback.
Solution Approach 2:
The system performs preliminary action by pre-synchronizing the pump operation with the drum rotation phase before spraying occurs. The controller anticipates the optimal timing for direct water nozzle activation based on predicted drum position, enabling coordinated spraying from both nozzles. This preliminary timing coordination ensures that water streams from circulation and direct nozzles combine in a controlled manner to maintain consistent spray form.
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 allows for precise control of the spray form and pattern, enhancing the laundry soaking and rinsing processes by ensuring consistent water distribution, making these steps more efficient and visually discernible.
Implementation Method 1
a pump for pumping water discharged from the tub to at least one circulation nozzle for spraying the water into the drum
Implementation Method 2
a direct water nozzle for spraying direct water supplied from an external water source into the drum
Data Source
AI summary
A method of controlling a washing machine. The washing machine includes a tub with an entry hole configured to receive laundry, a drum rotatably disposed in the tub, a ring-shaped gasket disposed along a circumference of the entry hole of the tub, a pump configured to circulate water that is discharged from the tub, and at least one circulation nozzle provided in the gasket and configured to spray the water that is circulated by the pump into the drum. The method includes: supplying water into the tub; rotating the drum; accelerating a pump speed of the pump while the drum rotates; and based on the pump speed of the pump reaching a threshold speed during the acceleration of the pump, opening a spray valve of the washing machine such that water supplied from an external water source is sprayed into the drum through a direct water nozzle.