Compressor Fault Diagnosis Using Current and Discharge Temperature
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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 by homeowners or service personnel, as they fail to precisely indicate the specific fault causing system shutdown.
Innovation Solution
A diagnostic system that includes a current sensor and a discharge line temperature sensor, processing circuitry to analyze data from these sensors, and generate signals indicative of high-side and low-side operating conditions, allowing for the determination of refrigeration circuit capacity and differentiation between high-side and low-side faults without the need for multiple independent sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to detect individual operating parameters, then measurement coverage is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensing functions into a single sensor that measures both temperature and pressure parameters simultaneously. This single integrated sensor replaces what would traditionally require multiple separate sensors, thereby reducing device complexity while maintaining comprehensive measurement coverage for fault detection
Solution Approach 2:
The sensor system is designed with multi-functionality to detect various operating parameters (temperature, pressure, and derived capacity information) using a unified sensing platform. This universal sensor can identify different fault conditions including high-side and low-side faults, eliminating the need for specialized sensors for each parameter
2Reliability
If conventional protection systems shut down compressor at predetermined thresholds, then compressor protection is improved, but diagnostic precision deteriorates
Solution Approach 1:
The system incorporates feedback mechanisms that continuously monitor temperature and pressure parameters and provide real-time information about compressor operating conditions. Rather than simple threshold-based shutdown, the feedback system analyzes the relationship between parameters to provide precise fault indication and enable informed protection decisions
Solution Approach 2:
The system performs preliminary diagnostic analysis by calculating refrigeration circuit capacity and identifying specific fault conditions (high-side vs. low-side faults) before shutdown is necessary. This preliminary action allows the system to distinguish between different fault types and provide accurate diagnostic information to guide maintenance actions
Data Source
AI summary
A system and method includes a compressor operable in a refrigeration circuit and including a motor, a current sensor detecting current supplied to the motor, a discharge line temperature sensor detecting discharge line temperature of the compressor, and processing circuitry receiving current data from the current sensor and discharge line temperature data from the discharge line temperature sensor and processing the current data and the discharge line temperature data to determine a capacity of the refrigeration circuit.