Compressor Sensor Configuration for Precise Fault Differentiation
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Solution Overview
Problem
Conventional compressor protection systems in refrigeration systems rely on multiple sensors to detect faults, which can lead to inaccurate diagnosis and require extensive testing to identify the specific issue, failing to provide precise fault indication and diagnostic capabilities.
Innovation Solution
A compressor protection system that uses a pair of sensors to detect high-side and low-side operating conditions, processing signals to indirectly determine non-measured parameters, and configure the compressor based on these parameters, allowing for precise fault detection and diagnostic capabilities without the need for multiple independent sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple independent sensors are used to detect compressor operating parameters, then measurement coverage is improved, but device complexity and diagnostic precision deteriorate due to inaccurate fault differentiation
Solution Approach 1:
The patent applies multi-functionality by enabling a single sensor to detect multiple operating parameters (temperature, pressure, flow conditions) through different measurement modes. The sensor can operate in first mode to detect high-side parameters and in second mode to detect low-side parameters, eliminating the need for separate sensors for each parameter while maintaining comprehensive monitoring capability.
Solution Approach 2:
The patent changes the operational parameters of the sensor itself rather than adding more sensors. By switching the sensor between different measurement modes (first mode for high-side, second mode for low-side), the system achieves multiple measurement functions from a single sensor, reducing device complexity while improving fault detection precision through parameter differentiation.
2Reliability
If multiple sensors are deployed to monitor all operating parameters, then fault detection capability is improved, but ease of operation deteriorates due to extensive testing requirements
Solution Approach 1:
The patent implements feedback by having the controller receive sensor signals and automatically determine compressor operating modes and fault conditions. The controller processes the sensor data to identify whether the compressor is in high-side or low-side mode and detects faults without requiring manual testing, thereby improving reliability while maintaining ease of operation through automated diagnostic feedback.
Solution Approach 2:
The system applies self-service by enabling the compressor to automatically diagnose its own operating conditions and faults. The sensor and controller work together to self-determine the operating mode (high-side or low-side) and self-identify faults without external intervention or extensive manual testing, improving both reliability and ease of operation.
3Speed
If discrete switches are used for protection, then response speed is improved, but loss of information occurs regarding specific fault conditions
Solution Approach 1:
The patent adds a temporal dimension to the protection system by implementing mode determination that tracks the sequence and duration of sensor signal conditions. Instead of simple discrete switches, the controller analyzes the time-based pattern of sensor readings to determine operating modes and fault types, maintaining fast response while preserving fault condition information through dimensional analysis of the signal over time.
Data Source
AI summary
A system and method including a compressor operable in a refrigeration circuit and including a motor, a current sensor detecting current drawn by the motor and providing a high-side condition signal, a discharge line temperature sensor detecting a discharge line temperature of the compressor and providing a low-side condition signal, and processing circuitry processing the high-side condition signal and the low-side condition signal during installation of the compressor to initially configure the compressor based on a non-measured condition of the refrigeration circuit.