Dishwasher Filter Clog Detection Using Pressure Sensor Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dishwashing appliances face issues with sediment accumulation in filter assemblies leading to obstructions and clogs, which can result in performance impairment and potential damage, and users often lack awareness of the cleaning schedule for these filters.
Innovation Solution
A method and system that utilize a pressure sensor in the sump to measure initial pressure and activate the drain pump, start a timer, and monitor pressure changes to determine if the filter is clogged, with a controller calculating a time limit based on recorded pressure values to assess filter status and alert the user when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter assembly is provided to remove sediment from wash liquid, then pump protection is improved, but the filter assembly becomes prone to clogging and requires regular cleaning
Solution Approach 1:
The system uses a pressure sensor to continuously monitor pressure differential across the filter assembly. When the pressure differential exceeds a threshold indicating clogging, the controller receives feedback and activates a cleaning cycle, eliminating the need for manual user intervention while maintaining reliable pump protection
Solution Approach 2:
The filter assembly performs self-cleaning through automated cleaning cycles initiated by the controller based on pressure sensor feedback. The system serves itself by automatically detecting and addressing clogging conditions without requiring user awareness or manual cleaning operations
2Ease of operation
If users are made aware of recommended cleaning schedules, then filter maintenance is improved, but users may still deviate from the schedule and filter may become clogged faster or slower than predicted
Solution Approach 1:
Instead of relying on user awareness of predetermined schedules, the system implements real-time feedback through pressure sensors that continuously monitor actual filter condition. The controller adjusts cleaning cycles based on actual pressure differential measurements, ensuring reliable clog prevention regardless of user behavior or varying usage conditions
Solution Approach 2:
The cleaning schedule transitions from a static predetermined timetable to a dynamic adaptive schedule. The controller modifies cleaning frequency and timing based on real-time pressure sensor data reflecting actual filter loading conditions, which vary with usage patterns and soil levels
3Difficulty of detecting and measuring
If pressure monitoring is implemented to detect filter clogs, then filter status detection is improved, but device complexity increases due to additional sensors and control logic
Solution Approach 1:
The pressure sensor acts as an intermediary that indirectly detects filter clogging conditions by measuring pressure differential across the filter. This indirect measurement approach simplifies detection compared to direct visual inspection or complex diagnostic systems, while the controller integrates the sensor data into existing cleaning control logic
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 solution effectively detects filter clogs and alerts users, preventing performance issues and potential damage by ensuring regular filter cleaning, even when users deviate from recommended schedules.
Implementation Method 1
measuring an initial pressure in the sump with the pressure sensor and activating the drain pump when the measured initial pressure in the sump is greater than or equal to a first pressure threshold
Data Source
AI summary
Dishwashing appliances and methods, as provided herein, may include features or steps such as measuring an initial pressure in a sump with a pressure sensor, activating a drain pump when the measured initial pressure in the sump is greater than or equal to a first pressure threshold, and starting a timer when the drain pump is activated. Dishwashing appliances and methods may further include features or steps for monitoring pressure within the sump with the pressure sensor after activating the drain pump, recording a value of the timer as a first time when the monitored pressure reaches a second pressure threshold, calculating a time limit based on the recorded first time value, and determining that the filter is clogged when the monitored pressure does not reach a third pressure threshold before the time limit expires.