Air Conditioner Diagnostic Sequencing for Rapid Malfunction Detection
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Solution Overview
Problem
Existing air-conditioning apparatuses face challenges in efficiently identifying malfunctioning parts, as existing diagnosis methods are time-consuming and lack an optimal order for diagnosis, leading to extended identification times and inaccuracies.
Innovation Solution
An air-conditioning apparatus with a refrigerant circuit, operational state sensors, and a controller that includes diagnostic operation instructions and control units for executing response detection and performance detection diagnosis modes, allowing for automatic and accurate identification of malfunctioning components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple diagnosis methods are performed sequentially to identify malfunctioning parts, then diagnosis comprehensiveness is improved, but diagnosis time is extended
Solution Approach 1:
The system performs preliminary stabilization of refrigerant flow rate and superheating degree before conducting performance detection diagnosis. This preliminary action ensures that the refrigeration cycle reaches a stable state, allowing accurate diagnosis without requiring extended diagnosis time for natural stabilization.
Solution Approach 2:
The control device executes diagnosis operations in periodic cycles: first performing response detection diagnosis by forcibly changing device operation, then performing performance detection diagnosis after stabilization. This periodic structured approach ensures comprehensive diagnosis while maintaining efficient time management through clear phase separation.
2Productivity
If response detection diagnosis is performed by forcibly changing device operation, then trouble detection speed is improved, but operational stability is reduced
Solution Approach 1:
The diagnosis process is segmented into two distinct phases: response detection diagnosis (with forced operation changes) and performance detection diagnosis (with stable operation). This segmentation allows the system to exploit the speed advantage of forced changes while limiting their impact on overall operational stability through clear phase separation.
Solution Approach 2:
The response detection diagnosis serves as a preliminary action to quickly identify obvious malfunctions before committing to a prolonged stable operation period. By performing this quick check first, the system avoids unnecessary extended stable operation when malfunctions are present, improving overall diagnostic efficiency.
3Measurement precision
If performance detection diagnosis is performed with stable operational state, then diagnosis accuracy is improved, but time required for stabilization is extended
Solution Approach 1:
The control device continuously monitors refrigerant flow rate and superheating degree during the stabilization period, using feedback control to detect when stable conditions are achieved. This feedback mechanism allows the system to transition to performance detection diagnosis as soon as stability criteria are met, minimizing unnecessary stabilization time while ensuring diagnostic accuracy.
Solution Approach 2:
The system performs preliminary stabilization of key parameters (refrigerant flow rate and superheating degree) before conducting performance detection. This targeted preliminary action focuses stabilization efforts on the most critical parameters, reducing overall stabilization time compared to stabilizing all system parameters.
4Adaptability or versatility
If worker experience and ability are relied upon for malfunction detection, then flexibility in handling various cases is improved, but identification time is prolonged
Solution Approach 1:
The air conditioning apparatus performs self-diagnosis through automated response detection and performance detection operations. The control device automatically analyzes sensor data, compares it against diagnostic criteria, and identifies malfunctioning parts without requiring worker intervention for the actual detection process, eliminating the time cost of manual inspection while maintaining adaptability through programmable diagnostic logic.
Solution Approach 2:
The system replaces the mechanical reliance on worker experience and manual inspection with an automated electronic diagnostic system. Sensors, control devices, and processing algorithms substitute for human senses and judgment, enabling rapid automated identification of malfunctions while maintaining the flexibility to handle various failure modes through software-configurable diagnostic criteria.
Data Source
AI summary
An air-conditioning apparatus has different two modes including a response detection diagnosis in which a control unit diagnoses a trouble of a component device during the trouble diagnosis operation based on presence or absence of a response from the operational state sensor when the mode has forcibly changed the device operation, and a performance detection diagnosis in which a trouble is detected by a detection value of the operational state sensor at a time when the operational state of the trouble diagnosis operation is stable, and the performance detection diagnosis is executed after the response detection diagnosis is executed.