Method and system for protection and diagnosis of a linear compressor, and a linear compressor
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Solution Overview
Problem
Existing methods for protecting and diagnosing linear compressors are inefficient and unreliable, as they do not effectively account for variations between different compressors, and fail to utilize the difference between suction and compression times, leading to potential damage and operational failures.
Innovation Solution
A method and system that calculate the difference between suction and compression times of a linear compressor's piston, using the counter electromotive force (CEMF) signal to determine a decision parameter, which detects abnormal operations and prevents failures by monitoring each work cycle, allowing for definitive shutdown if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If protection methods use the smallest amount of additional component possible, then manufacturing cost is reduced, but reliability of protection and diagnosis is worsened
Solution Approach 1:
The compressor system uses its own existing operational parameters (suction time and compression time) for self-diagnosis and protection. The control unit analyzes the difference between these two parameters to detect abnormalities such as piston impacts, valve plate collisions, and resonance conditions, eliminating the need for additional sensors or external monitoring devices while maintaining reliable protection.
2Device complexity
If protection methods treat suction and compression times independently, then measurement complexity is reduced, but measurement precision of operational anomalies is worsened
Solution Approach 1:
The control unit merges the analysis of suction time and compression time by calculating their difference (ΔT = Ts - Tc). This combined approach provides precise detection of operational anomalies such as piston impacts on the valve plate and resonance conditions, as these abnormalities manifest as deviations in the time difference pattern, thereby improving measurement precision while maintaining simple implementation.
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
This approach reduces variations between compressors, enables early detection of operational anomalies, and prevents damage by effectively monitoring and controlling the compressor's cycles, ensuring reliable operation and extending component lifespan.
Implementation Method 1
from the crossing by zero of the counter electromotive force (CEMF/FCEM) of the electric motor of the linear compressor
Data Source
AI summary
A method for protection and diagnosis of a linear compression including at least one electronic control. At each work cycle of the linear compressor, the protection method includes detecting a suction time of the linear compressor; detecting a compression time of the linear compressor; and calculating, after detecting a compression time of the linear compressor, a decision parameter equivalent to the difference between the previously detected suction time and the compression time.