Method for automatically evaluating the presence of foam in a dishwashing machine
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Solution Overview
Problem
Current dishwashing machines are not equipped to effectively handle the formation of foam during the wash cycle, which can lead to increased noise, reduced washing performance, and potential machine breakdowns due to the use of unsuitable detergents, detergent residues, or excessive detergent quantities.
Innovation Solution
A method and system that uses optical devices to automatically detect foam in the dishwashing machine by comparing digital images of the washing fluid collection zone before and after detergent release, generating a foam presence signal when a predefined threshold of fluid volume variation is exceeded, and modifying the wash program to prevent foam-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wash programs are calibrated assuming average detergent characteristics, then the washing machine can operate with standard parameters, but foam formation occurs when unsuitable detergents are used
Solution Approach 1:
The patent implements an optical detection system that continuously monitors the washing fluid collection zone during the wash cycle. When foam is detected through image analysis of the washing fluid surface, the system provides feedback to the control unit, which then adjusts wash parameters such as reducing water intake, increasing drainage, or extending the wash cycle to eliminate foam and ensure proper washing performance.
2Reliability
If optical devices are added to detect foam, then washing performance can be optimized, but device complexity increases
Solution Approach 1:
The patent utilizes an optical device (camera or television camera) that serves multiple functions: it monitors the washing fluid level in the collection zone, detects foam formation through image analysis, and provides visual information for wash cycle optimization. This multi-functional approach allows foam detection and washing optimization without adding separate dedicated detection devices, thereby limiting the increase in system complexity.
3Reliability
If foam detection and response systems are implemented, then machine breakdown risk is reduced, but manufacturing cost increases
Solution Approach 1:
The patent implements a self-monitoring and self-correcting system where the washing machine automatically detects foam through optical sensors and adjusts its own operating parameters without external intervention. The control unit autonomously modifies water intake, drainage, or wash cycle duration based on real-time foam detection, enabling the machine to prevent foam-related damage and maintain reliable operation without requiring complex external monitoring or manual adjustment systems.
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
Prevents noise increases, optimizes washing performance, ensures cleanliness by detecting foam and adjusting wash parameters, thereby reducing the risk of machine malfunction and detergent residue on dishes.
Implementation Method 1
an optical device (8) arranged in the dishwashing machine (1) so as to be able to acquire digital images of a washing fluid collection zone (2''')
Implementation Method 2
a control unit (4), in signal communication with the optical device (8), configured to: process the acquired digital images so as to calculate a value of fluid volume variation
Data Source
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AI summary
The present disclosure relates to a method for automatically evaluating the presence of foam in a dishwashing machine (1) provided with optical devices (8), the method comprising the steps of: acquiring (11) a first digital image (11A) representative of a first condition of the washing fluid collection zone (2''') of the dishwashing machine (1); digitally processing (12) the first digital image (11A) so as to obtain a first processed image (11B) which identifies the value of a first volume of fluid contained in the washing fluid collection zone (2'''); acquiring (13) a second digital image (13A) representative of a second condition of the washing fluid collection zone (2''') after a predefined time interval from the performance of the step of acquiring (11) a first digital image (11A); digitally processing (14) the second digital image (13A) so as to obtain a second processed image (13B) that identifies a value of a second volume of fluid contained in the washing fluid collection zone (2'''); comparing (15) the value of the first volume of fluid with the value of the second volume of fluid for calculating a value of fluid volume variation (DV); generating a foam presence signal (Sig) indicative of the presence of foam in the washing fluid collection zone (2'''), when the value of fluid volume variation (DV) exceeds a predefined threshold value; modifying the cleaning parameters of the cleaning program (P) of the dishwashing machine (1) when the foam presence signal is generated.