Dishwasher and method for controlling the dishwasher
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Solution Overview
Problem
Existing dishwashers require manual user intervention to check and clean filters, leading to inconvenience due to filter clogging and potential performance deterioration from foreign object accumulation.
Innovation Solution
A dishwasher equipped with a vibration sensor to detect filter clogging by analyzing the tub's vibration characteristics, using a controller to determine the filter state based on natural frequency variations, and providing user notifications for adaptive filter management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user manually checks the filter periodically, then filter cleaning is ensured, but user convenience is reduced
Solution Approach 1:
The system performs self-monitoring of filter status using the vibration sensor and natural frequency analysis. The dishwasher automatically detects when the filter is clogged and notifies the user, eliminating the need for manual checking and allowing users to respond only when necessary.
Solution Approach 2:
The system provides feedback to the user about filter status through notifications. The vibration sensor continuously monitors filter condition, and when clogging is detected (indicated by natural frequency variation exceeding threshold), the system communicates this information to the user to prompt filter cleaning.
2Extent of automation
If the vibration sensor and natural frequency analysis system is added, then automated filter detection is achieved, but device complexity increases
Solution Approach 1:
The vibration sensor serves multiple functions: it monitors filter clogging status, detects washing chamber vibrations, and enables natural frequency analysis for filter condition assessment. By making the sensor multi-functional, the system achieves automated filter detection without adding dedicated specialized sensors, thus limiting complexity increase.
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
Automated filter clogging detection and notification system improves user convenience by reducing manual intervention and maintaining washing performance by preventing filter blockages.
Implementation Method 1
a vibration sensor configured to sense vibration of the tub and to produce a corresponding sensed value
Implementation Method 2
a controller configured to obtain a first natural frequency of the tub based on the sensed value produced by the vibration sensor, obtain a second natural frequency of the tub based on the sensed value produced by the vibration sensor
Data Source
AI summary
A dishwasher according to an embodiment of the disclosure relates to providing a control method for determining whether a filter is clogged. A dishwasher according to an embodiment of the disclosure may comprise a tub, a sump assembly disposed under the tub and storing washing water, a circulation pump pumping and circulating the washing water stored in the sump assembly, at least one jet device jetting the washing water pumped by the circulation pump into the tub, a filter disposed under the tub and filtering a foreign object flowing inside the tub, a current sensor detecting a driving current input to the circulation pump, a vibration sensor detecting a vibration signal of the tub generated by driving of the circulation pump, and a controller configured to detect whether the filter is clogged based on information obtained from the current sensor and the vibration sensor.