Control method for refrigerator
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Solution Overview
Problem
Refrigerators face challenges in maintaining constant temperatures in both freezing and refrigerating compartments, leading to increased power consumption and reduced freshness of stored items due to frequent on/off cycles of refrigeration devices.
Innovation Solution
A control method that adjusts the output of cold air supply means in refrigerators by sensing temperatures in both compartments, optimizing the operation of compressors and fans to maintain constant temperatures, reduce power consumption, and prevent temperature deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first and second refrigeration devices operate at the same time until the temperature of the refrigerating or freezing compartment satisfies the desired temperature, then the temperature control is simple, but power consumption increases
Solution Approach 1:
The patent implements dynamic operation modes where the refrigeration devices can operate simultaneously, alternately, or in sequence based on real-time temperature conditions. The control unit dynamically switches between these modes to optimize power consumption while maintaining temperature control, resolving the contradiction between simple control and energy efficiency.
Solution Approach 2:
The system changes operational parameters by adjusting the operation timing and sequence of refrigeration devices based on temperature thresholds and hysteresis ranges. By modifying when devices start and stop operating, the system reduces unnecessary simultaneous operation and lowers power consumption while maintaining effective temperature control.
2Ease of operation
If turn on/off of each refrigeration device is determined based on the desired temperature of each compartment, then the control is straightforward, but the refrigeration device is frequently turned on/off which increases power consumption
Solution Approach 1:
The system performs preliminary cooling by operating the refrigeration device before the temperature reaches the desired threshold, utilizing the cold air already generated to maintain temperature without frequent on/off cycling. This preliminary action reduces the frequency of device activation while maintaining temperature control.
Solution Approach 2:
The patent implements periodic operation with extended cycles, where the refrigeration device operates for longer periods and then rests for longer intervals, rather than frequent short cycles. This periodic action with increased duty cycle reduces the frequency of turn on/off events and associated power consumption.
3Use of energy by moving object
If the first refrigeration device and the second refrigeration device alternately operate, then power consumption decreases, but it is difficult to maintain each compartment at a predetermined constant temperature
Solution Approach 1:
The control unit continuously monitors temperatures in both compartments and uses this feedback to determine the optimal operation mode. Based on real-time temperature data, the system adjusts whether devices operate simultaneously, alternately, or in sequence, maintaining temperature stability while optimizing power consumption.
Solution Approach 2:
The system dynamically adapts its operation strategy by switching between simultaneous operation, alternate operation, and sequential operation modes based on real-time temperature conditions. This dynamic adjustment allows the system to maintain temperature stability in both compartments while minimizing power consumption through optimized operation timing.
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 approach effectively maintains consistent temperatures in both compartments, reducing power consumption and extending the storage period of items by minimizing overcooling and withering, while improving the reliability of the cooling cycle.
Implementation Method 1
a first evaporator receiving the refrigerant from the first compressor to generate cold air for cooling a first storage chamber
Implementation Method 2
a second evaporator receiving the cold air from the second compressor to generate cold air for cooling the second storage chamber
Data Source
AI summary
A control method for a refrigerator comprises: decreasing an output of at least one of a cold air supply means for a first storage chamber or stopping the cold air supply means, if a sensed temperature of the first storage chamber reaches a value less than or equal to a second reference temperature; increasing the output, if a certain time has passed after the temperature has reached the value less than or equal to the second reference temperature, or if the temperature reaches a first specific value between a first reference temperature and the second reference temperature; and decreasing the output or stopping the cold air supply means, if a certain time has passed after the output of the air supply means has been changed in a previous step, or if the temperature reaches a preset second specific value between the first specific value and the second reference temperature.