Refrigerator Evaporator Defrost Control Using Frost Image Feedback
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Solution Overview
Problem
The existing defrosting systems in refrigerators often operate inefficiently due to inaccurate timing and frequent activation, leading to decreased refrigerating/freezing efficiency and poor adaptation to changing environmental conditions within the refrigerator.
Innovation Solution
A defrosting system that includes a frost monitoring camera to photograph the frost on the evaporator, a controller to determine the start and completion times of the defrosting operation based on image analysis, and a heat-generating unit to remove frost, using parameters such as RGB values, gray scale change, and color ratios to optimize the defrosting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the defrosting heater operates frequently based on time-based control, then the frost removal function is maintained, but the refrigerating/freezing efficiency decreases due to unnecessary heat generation
Solution Approach 1:
The system uses a camera to capture images of the evaporator surface and analyzes frost thickness in real-time, creating a feedback loop that adjusts defrosting operation based on actual frost conditions rather than fixed time intervals. The controller continuously monitors image data and activates the heater only when frost reaches a threshold level, eliminating unnecessary operations and improving refrigerating efficiency while maintaining reliable frost removal.
Solution Approach 2:
The patent replaces the traditional time-based mechanical control system with an optical detection system using a camera and image processing algorithm. Instead of relying on timers and fixed schedules, the system uses visual feedback to determine when defrosting is needed, substituting mechanical timing mechanisms with optical sensing and computational analysis to achieve more precise and efficient control.
2Device complexity
If the defrosting system operates based on fixed time intervals, then the control logic is simple, but the system cannot adapt to changing environmental conditions inside the refrigerator
Solution Approach 1:
The system implements real-time visual feedback by continuously capturing images of the evaporator and analyzing frost accumulation patterns. This feedback mechanism allows the control system to adapt to varying environmental conditions such as humidity changes, door opening frequency, and usage patterns, adjusting defrosting timing dynamically rather than following fixed schedules.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by automatically analyzing its own operational state through image capture and processing. The controller monitors the evaporator condition independently and makes autonomous decisions about when defrosting is needed, eliminating the need for complex external sensing systems while achieving environmental adaptability.
3Reliability
If the defrosting heater operates for extended periods to ensure complete frost removal, then frost is thoroughly removed, but energy consumption increases and refrigerating efficiency deteriorates
Solution Approach 1:
The system applies partial action by activating the defrosting heater only for the minimum necessary duration to remove frost to an acceptable level, rather than using excessive heating time. The image-based monitoring allows the system to stop heating once frost thickness reaches a predefined threshold, avoiding unnecessary energy consumption while maintaining sufficient frost removal effectiveness.
Solution Approach 2:
The patent replaces traditional temperature-based or time-based control mechanisms with optical image analysis to precisely monitor frost removal progress. This substitution enables real-time assessment of defrosting effectiveness, allowing the system to terminate heating operations as soon as adequate frost removal is achieved, thereby minimizing energy consumption while ensuring complete enough frost removal for optimal performance.
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 allows for precise timing of defrosting operations, reducing unnecessary heat generation and improving the efficiency of frost removal, thereby enhancing the overall refrigerating and freezing performance while adapting to changing conditions.
Implementation Method 1
an evaporator configured to reduce an ambient temperature by heat exchange through movement of refrigerant
Implementation Method 2
a heat-generating unit configured to emit heat in response to a signal applied from the controller to remove the frost
Data Source
AI summary
Disclosed is a defrosting system and a defrosting method of a refrigerator, the system including an evaporator configured to reduce an ambient temperature by heat exchange through movement of refrigerant, a frost monitoring camera by photographing a state of frost adhered to the evaporator, a controller configured to grasp changes of an image captured by the frost monitoring camera to determine a defrosting start time, and a heat-generating unit configured to emit heat in response to a signal applied from the controller to remove the frost, whereby an unnecessary operation of a heat-generating unit is prevented by appropriately coping with an environment that flexibly changes according to an inner situation of a refrigerator and by accurately determining, by the controller, a start time and a completion time of defrosting operation for removing frost adhered to the refrigerator.