Learning device and inference device for state of air conditioning system
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Solution Overview
Problem
Existing air conditioning system state estimation methods face accuracy issues due to varying threshold values depending on the operating environment, leading to decreased estimation precision.
Innovation Solution
A learning device and inference device that utilize operation data from an air conditioning system, including temperature, pressure, and current/voltage values, to generate trained models that adapt to specific environmental conditions, improving estimation accuracy by learning relationships between operation data and parameters like compressor frequency, expansion valve opening, and fan speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a common threshold value is used for abnormality detection regardless of operating environment, then the device complexity is reduced and ease of operation is improved, but the measurement precision and reliability of state estimation deteriorate
Solution Approach 1:
The learning device performs preliminary learning to create environment-specific threshold values before actual abnormality detection. The system pre-processes operation data from multiple operating environments to establish customized thresholds for each environment, so that when detection is needed, the already-optimized thresholds are ready for immediate use, improving precision without adding complexity to the detection process itself
Solution Approach 2:
The system changes the threshold parameter based on operating environment by learning different threshold values for different environments. Instead of using a fixed threshold, the system adapts the threshold parameter to match specific operating conditions (such as different outdoor temperatures, humidity levels, or usage patterns), thereby maintaining high measurement precision across varying conditions
2Reliability
If environment-specific threshold values are used for each operating condition, then the measurement precision of state estimation is improved, but the device complexity increases due to need for learning and adaptation mechanisms
Solution Approach 1:
The learning device and inference device are integrated into the air conditioning system itself, allowing the system to automatically learn and adapt to its own operating environment without external intervention. The system collects its own operation data, performs self-learning to establish environment-specific thresholds, and uses these thresholds for self-diagnosis, thereby improving reliability while minimizing the need for external complex detection systems
Solution Approach 2:
The learning device serves multiple functions: it collects operation data, learns environment-specific characteristics, generates customized threshold values, and supports abnormality detection. By making the learning device multi-functional, the patent reduces the need for separate dedicated components for each function, thereby improving reliability through comprehensive environmental adaptation while controlling overall device complexity
Data Source
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AI summary
A learning device (100) learns a state of an air conditioning system in which refrigerant circulates. The air conditioning system includes an outdoor unit and at least one indoor unit. The learning device (100) includes: a first data acquisition unit (110); and a model generation unit (120). The first data acquisition unit (110) is configured to acquire operation data of the air conditioning system. The model generation unit (120) is configured to convert a specific model (M1 to M3) into a trained model using the operation data. The operation data includes a specific parameter and at least one of a temperature of air passing through the second heat exchanger, a temperature and a pressure of the refrigerant, and a temperature outside a space where each of the at least one indoor unit is arranged. The specific model (M1 to M3) estimates the specific parameter from the operation data other than the specific parameter. The specific parameter includes at least one of an operating frequency of the compressor, a degree of opening of the expansion valve, and an amount of air blown per unit time by the blower.