Dishwasher Overfill Detection Using Float Switches and Error Routines
Find Innovative SolutionsGenerate Solutions
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 utilize detection devices, such as float switches and turbidity sensors, to detect overfill conditions and control the water valve and drain pump to remove excess water, including error routines to diagnose and address issues with the water valve, drain pump, and clog detection, ensuring the system can prevent overfilling and identify malfunctioning components.
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 low due to potential component failure and flooding risk
Solution Approach 1:
The patent applies local quality by implementing different detection mechanisms at different water levels. A first float switch detects normal high water levels, while a second float switch detects abnormal high water levels. This localized differentiation allows the system to respond appropriately to different conditions, improving reliability without requiring complete system redesign.
Solution Approach 2:
The water level detection function is segmented into multiple independent float switches, each responsible for specific water level thresholds. This segmentation allows the system to detect and respond to different water level conditions independently, preventing single-point failure and improving overall system reliability.
2Ease of operation
If the float stem moves freely through the central opening to activate the float switch, then the float switch functions properly, but water can leak out through the open-to-atmosphere condition
Solution Approach 1:
The patent introduces an intermediary mechanism (sealed float chamber or alternative activation method) that allows the float switch to be actuated by water level changes without creating a direct open path for water leakage. This intermediary preserves the functional benefit of float switch operation while eliminating the harmful leakage effect.
3Reliability
If multiple detection devices and error routines are implemented, then the reliability and diagnostic capability improve, but the device complexity increases
Solution Approach 1:
The patent implements preliminary action by incorporating error detection routines that proactively identify potential failures before they lead to overfilling. The system monitors float switch functionality and water level trends in advance, allowing preventive measures to be taken before actual overfill conditions occur, thereby improving reliability without requiring overly complex real-time intervention systems.
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.