Variable-Capacity Compressor Fault Mode for Sensor Communication Loss
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Solution Overview
Problem
Climate-control systems with variable-capacity compressors face challenges in maintaining energy efficiency and comfort due to communication disruptions with outdoor-air-temperature sensors, leading to inefficient operation and potential faults.
Innovation Solution
A control module that switches the compressor between low and high capacities based on outdoor-air-temperature data and demand signals, with fault modes activated when communication is interrupted, and uses local weather data to adjust operation, generating alerts and mitigating actions to prevent stuck operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the system operates in normal mode using outdoor-air-temperature sensor data to switch compressor capacities, then energy efficiency and comfort are optimized, but the system becomes vulnerable to communication disruptions and sensor failures
Solution Approach 1:
The control module is programmed with predetermined fault mode operations that automatically activate when communication with the outdoor-air-temperature sensor is interrupted or when temperature readings fall outside expected ranges. This preparatory fault tolerance design ensures the compressor continues operating reliably without requiring real-time sensor data, thus cushioning against potential sensor failures while maintaining energy efficiency during normal operation
Solution Approach 2:
The system continuously monitors communication status with the outdoor-air-temperature sensor and validates temperature readings against predetermined ranges. When anomalies are detected, the control module transitions from normal capacity-switching operation to fault mode operation, providing feedback-based adaptive control that maintains reliability while preserving energy efficiency under normal conditions
2Ease of operation
If the system switches between first and second capacities based on outdoor-air-temperature data, then comfort and energy efficiency are maintained, but communication interruptions can cause stuck operations and faults
Solution Approach 1:
The control module contains predetermined fault mode operations that are prepared in advance to handle communication disruptions. When the outdoor-air-temperature sensor communication is interrupted or readings are invalid, the system automatically transitions to fault mode with predetermined compressor operations, preventing stuck operations and ensuring continuous reliable operation without compromising comfort
Solution Approach 2:
The system establishes predetermined operational parameters and fault response protocols before communication disruptions occur. These preliminary fault mode configurations allow the compressor to operate reliably with predetermined capacities when sensor data is unavailable, preventing operational stalls and maintaining comfort without requiring real-time temperature data
3Reliability
If the system uses predetermined fault mode operations when sensor communication is interrupted, then reliability is maintained, but the system loses the ability to optimize capacity switching based on actual temperature conditions
Solution Approach 1:
The control module dynamically transitions between normal mode and fault mode based on real-time sensor communication status. During normal operation with valid sensor data, the system optimizes energy efficiency by switching compressor capacities according to outdoor-air-temperature readings. When communication is interrupted, it dynamically switches to predetermined fault mode operations, maintaining reliability while preserving energy efficiency capabilities when conditions permit
4Reliability
If the system continuously monitors sensor communication and temperature ranges, then fault detection capability is improved, but system complexity increases
Solution Approach 1:
The control module performs self-diagnosis by continuously monitoring its own communication status with the outdoor-air-temperature sensor and validating temperature readings against predetermined ranges. This self-service fault detection capability allows the system to identify communication interruptions and invalid readings autonomously without requiring external monitoring systems, improving reliability while minimizing additional complexity
Data Source
AI summary
A system includes a variable-capacity compressor operable at a first capacity and at a second capacity that is higher than the first capacity and an outdoor-air-temperature sensor. A control module receives a demand signal from a thermostat and operates the variable-capacity compressor in a first mode when communication with the outdoor-air-temperature sensor has not been interrupted and in a fault mode when communication with the outdoor-air-temperature sensor has been interrupted. In the first mode, the control module switches the variable-capacity compressor between the first capacity and the second capacity based on the demand signal and the outdoor-air-temperature data. In the fault mode, the control module operates the variable-capacity compressor by operating the variable-capacity compressor at at least one of the first capacity and the second capacity based on the demand signal.