Remote Controller History Capture for Air Conditioner Fault Diagnosis
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Solution Overview
Problem
Existing air conditioning systems face challenges in identifying and reproducing causes of abnormal conditions, especially those with low reproducibility, as service engineers can only monitor instantaneous data and struggle to diagnose issues within limited time frames.
Innovation Solution
An air conditioning system with a remote controller that includes a storage unit, monitoring unit, and data output unit, which acquires and stores operation data from outdoor and indoor units, overwrites data when capacity is exceeded, saves data during abnormal conditions, and allows external data transfer, enabling the preservation and display of historical operation data for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote controller only stores instantaneous operation data at the moment of abnormal condition, then the storage capacity is sufficient and device complexity is low, but the ability to diagnose abnormal conditions with low reproducibility is insufficient
Solution Approach 1:
The remote controller continuously stores operation data in chronological order before abnormal conditions occur. This preliminary data collection enables service engineers to diagnose abnormal conditions with low reproducibility by reviewing historical operation data, eliminating the need to wait for abnormal conditions to recur.
Solution Approach 2:
The storage unit is divided into a normal operation data storage area and an abnormal condition data storage area. When an abnormal condition occurs, the system switches to storing data in the abnormal condition area, preserving critical diagnostic information while maintaining continuous monitoring capability.
2Loss of information
If the remote controller continuously stores operation data indefinitely, then the diagnostic information completeness is improved, but the storage unit capacity is exceeded and data management complexity increases
Solution Approach 1:
The system automatically overwrites oldest normal operation data when the storage unit reaches capacity. This ensures continuous monitoring capability is maintained while prioritizing recent operation data, which is most relevant for diagnosing current abnormal conditions.
Solution Approach 2:
The system preserves operation data for a predetermined period before abnormal conditions occur. This preliminary retention strategy ensures sufficient diagnostic information is available while automatically managing storage lifecycle through time-based expiration.
3Measurement precision
If the remote controller stores detailed operation data for extended periods, then the diagnostic precision is improved, but the energy consumption and data processing load increase
Solution Approach 1:
The system applies different storage strategies to different data types: detailed continuous storage for critical parameters during abnormal conditions, and selective/periodic storage for normal operation data. This localized quality approach optimizes diagnostic precision while minimizing energy consumption.
Solution Approach 2:
The system changes storage parameters dynamically based on operation state. During normal operation, data is stored with lower frequency or selectively. When abnormal conditions occur, the system switches to high-frequency detailed storage, optimizing both diagnostic precision and energy efficiency.
Data Source
AI summary
An air conditioning system includes: an outdoor unit of an air conditioner; an indoor unit of the air conditioner; and a remote controller that operates and monitors at least one of the outdoor unit or the indoor unit. The remote controller includes: a storage and a processor coupled to the storage. The processor of the remote controller: acquires operation data from at least one of the outdoor unit or the indoor unit; stores the operation data in the storage by overwriting pre-stored operation data already in the storage when a predetermined capacity of the storage is exceeded; saves, during a past predetermined period when an abnormal condition occurs at the air conditioner and in the storage, a copy of the operation data; and displays the copy of the operation data or sends the copy of the operation data externally.