Indoor Expansion Valve Fault Detection by Pipe Temperature Response
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Solution Overview
Problem
Conventional methods for detecting malfunctions in air conditioner indoor expansion valves rely on expert technicians and lack precision, especially during both cooling and heating operations.
Innovation Solution
An air conditioner system with a control unit that measures indoor unit pipe temperatures to detect abnormalities by actuating the indoor expansion valve to different states, allowing for automated and precise malfunction detection in both cooling and heating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expert technicians manually monitor the operating state to detect malfunctions, then detection capability is maintained, but detection precision and automation are insufficient
Solution Approach 1:
The air conditioner system performs self-diagnosis by automatically monitoring its own operating parameters (suction pressure, discharge pressure, temperatures) and comparing them against expected ranges to detect expansion valve malfunctions, eliminating the need for external expert technicians
Solution Approach 2:
The patent replaces manual expert monitoring with an automated control unit that uses sensor data and algorithmic analysis to detect malfunctions, substituting human expertise with electronic measurement and computational systems
2Reliability
If conventional monitoring methods are used, then detection is possible, but reliability across both cooling and heating operations is insufficient
Solution Approach 1:
The control unit implements a universal detection algorithm that monitors multiple operating parameters and adapts to both cooling and heating modes, enabling reliable malfunction detection across different operational conditions without requiring separate detection systems
3Productivity
If automated detection systems are implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The control unit continuously monitors operating parameters and provides real-time feedback to detect deviations indicating malfunctions, using existing sensor feedback loops rather than adding complex independent detection hardware
Solution Approach 2:
The patent combines the malfunction detection function with the existing control unit that manages air conditioner operation, merging multiple functions into a single device rather than adding separate complex detection 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
Automates the detection of indoor expansion valve malfunctions, improving precision and reducing reliance on expert proficiency, enabling effective detection in both cooling and heating operations.
Implementation Method 1
measuring an indoor unit pipe temperature around an indoor heat exchanger during operation of the air conditioner
Implementation Method 2
actuating an indoor expansion valve connected to the indoor heat exchanger to a first state
Implementation Method 3
an indoor heat exchanger including a refrigerant that exchanges heat with indoor air
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
An air conditioner, which automatically detects malfunction, and a method for detecting a malfunction thereof are provided. The method includes: measuring an indoor unit pipe temperature around an indoor heat exchanger during operation of the air conditioner; actuating an indoor expansion valve connected to the indoor heat exchanger to a first state; and detecting whether or not a variation of the indoor unit pipe temperature is abnormal by measuring the indoor unit pipe temperature after actuating the indoor expansion valve to the first state.