Air Conditioner Fluid Line Diagnostics Using Pump Feedback Signals
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Solution Overview
Problem
Existing air conditioning apparatuses face diagnostic challenges due to indirect methods of detecting abnormal operations, such as temperature or pressure changes, which can lead to errors in identifying issues like air introduction into water pipes or heat exchanger failures.
Innovation Solution
The air conditioning apparatus includes a controller that uses the output signal of a pump to determine normal or abnormal operating regions, calculating the sample standard deviation of the pump's output duty to differentiate between clogging and air introduction into fluid pipes, allowing for direct diagnosis and corrective action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature or pressure sensors are used to detect abnormal operations, then the system can monitor cycle conditions, but diagnostic accuracy deteriorates due to indirect detection methods
Solution Approach 1:
The patent extracts the diagnostic function from indirect temperature/pressure monitoring and relocates it to the pump's output signal analysis. The controller now directly monitors the pump's output signal to detect abnormalities such as air introduction or clogging, eliminating the need for separate temperature or pressure sensors for diagnostic purposes and improving accuracy through direct measurement.
2Measurement precision
If multiple sensors are added to improve diagnostic capability, then detection precision improves, but device complexity increases
Solution Approach 1:
The pump serves multiple functions: it circulates fluid through the system and simultaneously provides diagnostic information through its output signal. The controller analyzes the pump's output signal to detect various abnormal conditions (air introduction, clogging, heat exchanger failures), making the pump a multi-functional component that eliminates the need for additional dedicated sensors.
Solution Approach 2:
The system uses the pump's own output signal for self-diagnosis. The controller monitors the pump's performance characteristics and automatically detects abnormalities without requiring external sensing systems. This self-service approach improves measurement precision while avoiding the complexity of additional sensors.
3Reliability
If indirect diagnostic methods are used, then the system can operate with simpler components, but diagnostic reliability deteriorates due to multiple potential failure sources
Solution Approach 1:
The controller implements feedback monitoring of the pump's output signal to continuously assess system health. By analyzing the relationship between the pump's input and output signals, the system can reliably detect abnormalities and provide feedback for corrective action, improving diagnostic reliability without complicating the overall system architecture.
Data Source
AI summary
An air conditioning apparatus and a method for controlling an air conditioning apparatus are provided. The air conditioning apparatus may include a controller that performs an abnormal operation diagnosis of the air conditioning apparatus based on an output signal of a pump, thereby directly checking introduction of air into pipes or clogging of valves.