Dual-Evaporator Cooling Control for Stable Multi-Compartment Temperatures
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Solution Overview
Problem
Dual-evaporator appliances, such as refrigerators, face challenges in maintaining temperature stability across multiple compartments due to variations in cooling cycles and exceptional conditions, which existing control methods fail to efficiently address.
Innovation Solution
A robust fixed-sequence control method that utilizes a processor to monitor actual temperatures, select control temperatures, and generate command input signals for the compressor, fans, and valve to establish exceptions within recurring cooling cycles, ensuring stable cooling across compartments by initiating specific exceptions based on temperature differences and priority values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed-sequence cooling cycle is used to control dual evaporator appliances, then the control structure is simple and reliable, but the temperature stability across multiple compartments deteriorates due to inability to respond to exceptional conditions
Solution Approach 1:
The control system transitions from a static fixed-sequence cycle to a dynamic adaptive cycle by introducing exception handling capabilities. The processor monitors actual temperatures and dynamically adjusts the cooling sequence by initiating exception routines when temperature deviations are detected, allowing the system to adapt to exceptional conditions while maintaining the basic reliability of the fixed-sequence structure.
Solution Approach 2:
The system implements feedback control by continuously monitoring actual temperatures in each compartment and comparing them against expected temperature ranges. When feedback indicates a deviation (exceptional condition), the processor triggers appropriate exception routines that modify the cooling sequence, thereby maintaining temperature stability without compromising the overall control structure reliability.
2Stability of the object's composition
If exception routines are added to handle exceptional conditions, then the temperature stability improves, but the device complexity increases
Solution Approach 1:
The control system is segmented into distinct functional modules: the basic fixed-sequence controller and separate exception handling routines. This segmentation allows the exception handling logic to be added without fundamentally redesigning the entire control system. The processor executes normal fixed-sequence operations and only intervenes when exceptional conditions are detected, thereby managing complexity through functional separation.
Solution Approach 2:
Exception handling is extracted as a separate control layer from the basic fixed-sequence logic. The exception routines are independent modules that are invoked only when needed, rather than being integrated into every control cycle. This extraction minimizes the impact on overall system complexity while providing robust temperature stability when exceptional conditions occur.
3Measurement precision
If continuous temperature monitoring and exception handling are implemented, then the temperature control precision improves, but the energy consumption increases
Solution Approach 1:
The system uses periodic temperature monitoring at strategically chosen intervals within the fixed-sequence cooling cycle rather than continuous monitoring. Temperature checks are performed at natural transition points in the cooling sequence, reducing the frequency of measurements while maintaining sufficient precision for detecting exceptional conditions. This periodic approach balances measurement precision with energy efficiency.
Solution Approach 2:
The exception handling system is designed to be self-regulating, using the existing temperature data and fixed-sequence timing information to determine when exceptions are needed. The processor leverages already-available system state information rather than requiring additional active sensing or control actions during normal operation, thereby minimizing additional energy consumption while maintaining high temperature control precision.
Data Source
AI summary
A method to control a fixed-sequence dual evaporator cooling system including providing a recurring cooling cycle cooling system wherein each recurring cooling cycle comprises first and second cooling cycles for cooling respective first and second interiors, a pump-out cycle for returning coolant to a condenser, and an idle cycle, and providing a processor to establish exceptions to the recurring cooling cycle. A step includes the processor monitoring first and second actual temperatures of the respective first and second interiors, selecting predetermined first and second control temperatures for the respective first and second interiors, and selecting a command input signal to supply to a compressor, the condenser fan, the first and second evaporator fans, and the valve of the cooling system during the recurring cooling cycle based upon the first and second actual temperatures and the predetermined first and second control temperatures to initiate the established exceptions.