Detergent Dispenser Sensing for Multi-Tablet Dishwashers
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Solution Overview
Problem
Existing dishwashers with complex user interfaces and multiple programs become cumbersome when using advanced solid detergents like '2 in 1', '3 in 1', '4 in 1', and '5 in 1' compositions, leading to user errors and suboptimal washing results due to the need for manual adjustments.
Innovation Solution
A dishwasher design with separate chambers and sensors for different detergent types, automatically selecting the appropriate program and adjusting settings based on the loaded detergent, ensuring correct usage and optimal washing performance without requiring complex user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex user interface with multiple buttons and washing programs is added to support various detergent types, then the dishwasher can accommodate different detergent functions, but the ease of operation deteriorates and user errors increase
Solution Approach 1:
The detergent packet itself serves as the identifier by containing a machine-readable code that automatically provides information about its properties (detergent type, rinse aid content, water softening agents). The system reads this code and automatically configures the washing program, eliminating the need for manual user input and complex interfaces.
Solution Approach 2:
The manual mechanical interaction of selecting buttons and programs is replaced by an automated optical/electronic reading system that scans the machine-readable code on the detergent packet and automatically determines the appropriate washing parameters.
2Manufacturing precision
If manual adjustment of washing programs is required for different detergent types, then precise control over washing parameters is achieved, but the reliability deteriorates due to user forgetfulness and errors
Solution Approach 1:
The system incorporates a feedback loop where the machine-readable code on the detergent packet provides information about the detergent's properties, and the control unit automatically adjusts the washing program parameters based on this information, ensuring precise and reliable configuration without manual intervention.
Solution Approach 2:
The detergent manufacturer pre-encodes the necessary washing information directly on the detergent packet in machine-readable form, so that all required parameters are prepared in advance and automatically read by the dishwasher, eliminating the need for manual adjustment and preventing user errors.
3Extent of automation
If separate chambers and sensors for different detergent types are implemented, then automatic detergent recognition is achieved, but the device complexity increases
Solution Approach 1:
The machine-readable code reading system serves multiple functions: it identifies the detergent type, determines rinse aid requirements, detects water softening agents, and triggers appropriate program selections. This single multi-functional system replaces what would otherwise require multiple separate sensors and detection mechanisms.
4Object-generated harmful factors
If the rinse aid distributor is deactivated when solid detergents with rinse aid properties are detected, then the harmful effect of excessive rinse aid is eliminated, but the loss of information about user intent occurs
Solution Approach 1:
The detergent packet self-identifies its contents through the machine-readable code, informing the system about the presence of rinse aid properties. This allows the system to automatically adjust the rinse aid distributor settings without needing to ask the user, eliminating excessive rinse aid while respecting the detergent's formulated properties.
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
Simplifies the user experience by eliminating the need for manual adjustments, reducing errors, and ensuring effective washing performance across various detergent types and water conditions.
Implementation Method 1
such side wall may be deformed by the weight of the solid detergent tablet if present in the chamber
Implementation Method 2
such side wall may be deformed by the weight of the solid detergent tablet
Data Source
Figure 1~3
AI summary
A dishwashing machine, capable of carrying out a normal washing program with a powder detergent as well as programs using solid detergents with additives having rinse aid properties and/or water softening properties, comprises a detergent dispenser (16) provided with three chambers (20,22,24) each for a specific kind of detergent, such chambers being provided with sensor means for detecting the presence of loaded detergent and for adjusting the washing program accordingly.