Method of draining washing liquid from a washing appliance, and washing appliance configured to actuate the method

By monitoring drain pump motor parameters like current and torque at varying speeds, the method ensures reliable washing liquid drainage in dishwashers without pressure sensors, addressing cost and reliability issues.

WO2026124752A1 Publication Date: 2026-06-18ELECTROLUX APPLIANCES
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ELECTROLUX APPLIANCES
Filing Date
2024-12-10
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

The challenge of controlling the washing liquid drain process in dishwashers without using liquid pressure sensors, which are costly and prone to malfunction, necessitates an alternative method to ensure effective drainage.

⚗Method used

Monitoring electrical or electromechanical parameters of the drain pump motor, such as current, voltage, and torque, to determine the completion of the drainage process by comparing values at different rotation speeds, allowing for reliable detection of liquid presence or absence in the washing tub.

🎯Benefits of technology

Enables effective and reliable drainage of washing liquid from dishwashers by eliminating the need for pressure sensors, reducing costs and enhancing operational robustness.

✦ Generated by Eureka AI based on patent content.

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Abstract

Method of draining washing liquid from a washing appliance (100) comprising a washing tub (110) and a drain pump (160) having a drain pump electric motor (166) and being in fluid communication with the washing tub (110). The method comprises performing a washing liquid drain procedure comprising: controlling the drain pump motor to cause the drain pump to operate at a first operating speed (415); detecting a value of at least one electrical or electromechanical parameter of the drain pump motor while the drain pump is operated at the first speed; controlling the drain pump motor to cause the drain pump to operate at a second operating speed different from the second operating speed (425); detecting a value of the electrical or electromechanical parameter while the drain pump is operated at the second speed; comparing (455) the detected value of the electrical or electromechanical parameter of the drain pump motor while the drain pump is operated at the first speed to the detected value of the electrical or electromechanical parameter of the drain pump motor while the drain pump is operated at the second speed, and determining (455) if the washing liquid drain procedure is completed based on said comparing.
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