Dishwasher Overfill Detection Using Sensor-Controlled Drain Response
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Solution Overview
Problem
Dishwashers often experience overfilling due to component failures, leading to flooding, as they rely solely on mechanical floats for water level detection, which can be faulty and create a path for water leakage, and there is a need for an effective method to prevent overfilling and diagnose malfunctioning components.
Innovation Solution
A system and method that uses detection devices, such as a float and float switch, along with a control device to monitor and control the water valve and drain pump, executing routines to detect and remove overfill conditions, diagnose errors, and prevent water leakage by actuating the drain pump and closing the water valve until the overfill condition is resolved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a mechanical float switch is used for water level detection, then the structure is simple and cost-effective, but the reliability is insufficient due to potential component failures and flooding risks
Solution Approach 1:
The water level detection function is segmented into multiple independent sensors (first water level sensor, second water level sensor, third water level sensor) positioned at different heights, rather than relying on a single mechanical float switch. This segmentation provides redundancy and improves reliability while maintaining relatively simple structure.
Solution Approach 2:
The patent replaces the mechanical float switch with electronic water level sensors that detect water level through electrical signals. This substitution eliminates the mechanical components that can fail or create leakage paths, thereby improving reliability without significantly increasing structural complexity.
2Reliability
If multiple water level sensors are deployed, then the reliability of overfill prevention is improved, but the device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it processes signals from all water level sensors, controls both the water inlet valve and drain pump, and executes diagnostic routines. By making the control unit universal and multi-functional, the patent avoids adding separate control devices for each sensor, thereby improving reliability without proportionally increasing overall system complexity.
Solution Approach 2:
The patent combines the control functions for multiple sensors, water inlet valve, and drain pump into a single integrated control unit. This merging consolidates the system architecture and manages complexity by centralizing control logic rather than distributing it across multiple separate controllers.
3Object-affected harmful factors
If the drain pump is continuously actuated to remove overfill conditions, then the harmful effect of flooding is reduced, but the energy consumption increases
Solution Approach 1:
The control unit operates the drain pump in periodic cycles rather than continuously. When overfill conditions are detected, the pump is activated to drain water, and when water level sensors indicate the condition is resolved, the pump is deactivated. This periodic operation eliminates flooding risk while minimizing energy consumption by running the pump only when necessary.
Solution Approach 2:
The system uses feedback from water level sensors to control drain pump operation. The sensors continuously monitor water level and provide feedback signals to the control unit, which adjusts pump operation accordingly. This feedback mechanism ensures the pump runs only when overfill conditions exist, reducing energy waste while maintaining protection against flooding.
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
Effectively prevents overfilling by controlling water levels and diagnosing component malfunctions, reducing the risk of flooding and water leakage, and ensuring the dishwasher operates safely and efficiently.
Implementation Method 1
detecting an overfill condition in the dishwasher with at least one detection device, wherein the overfill condition corresponds to a water level in the dishwasher that is greater than a predetermined threshold
Data Source
AI summary
A method, system, and computer-program product for preventing overfilling in a dishwasher are disclosed herein. According to one embodiment, a method for preventing overfilling in a dishwasher is provided, wherein the dishwasher includes a water valve for providing water to the dishwasher and a drain pump for removing water from the dishwasher. The method comprises detecting an overfill condition in the dishwasher with at least one detection device, wherein the overfill condition corresponds to a water level in the dishwasher that is greater than a predetermined threshold. The method further includes controlling the drain pump and the water valve in response to detecting the overfill condition in order to facilitate removal of the overfill condition.