Compressor Working Volume State Feedback for Fault Detection
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Solution Overview
Problem
Conventional air conditioning units with double-cylinder compressors face instability and reduced reliability due to mismatched working volume states caused by damaged or faulty control valves, leading to potential shutdowns and poor user experience.
Innovation Solution
A control method for compressors that includes a detection system and controller to monitor and adjust the working volume, sending fault alarms if the compressor's state is not matched with the control instruction, and implementing a method to determine the current working volume state by analyzing parameters such as current, voltage, or pressure differences, ensuring timely maintenance and preventing faulty operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional control method is used to change the working volume of a double-cylinder compressor, then the energy efficiency is improved by switching to different working volumes, but the system reliability deteriorates due to potential mismatches between control instructions and actual working volume state caused by damaged control valves
Solution Approach 1:
The patent implements a feedback mechanism where the control device receives feedback information about the actual working volume state of the compressor (single-cylinder or double-cylinder state) and compares it with the expected state from control instructions. This feedback loop enables the system to detect mismatches between commanded and actual working volumes, allowing for real-time fault detection and correction, thereby maintaining reliability while preserving energy efficiency benefits.
Solution Approach 2:
The control device actively monitors the working volume state through feedback from sensors or system state detection, comparing the detected state against the intended state from control instructions. When a mismatch is detected (indicating potential valve damage or system fault), the system can trigger alerts or corrective actions, ensuring continuous reliable operation while maintaining optimal energy efficiency.
2Reliability
If the control device continuously monitors the working volume state to ensure reliability, then the system reliability is improved, but the device complexity increases due to additional detection systems and control mechanisms
Solution Approach 1:
The system employs self-service monitoring where the control device utilizes existing control instructions and basic system state information to determine the working volume state without requiring complex external detection systems. The control device can infer the working volume state from the execution status of control instructions and basic sensor readings already present in the system, thereby achieving reliable monitoring with minimal additional complexity.
Solution Approach 2:
The control device performs multiple functions: it not only controls the compressor's working volume changes but also simultaneously monitors and detects the actual working volume state and compares it with control instructions. This multi-functionality eliminates the need for separate dedicated detection systems, achieving reliable monitoring while keeping device complexity low by making the control device universally responsible for both control and detection tasks.
Data Source
AI summary
The present disclosure provides a control method of a compressor and a refrigerant circulation system. The control method includes deciding whether a current working volume state of the compressor is matched with a control instruction after the compressor completes a change to a working volume according to the control instruction; determining that the compressor operates normally in a case where the current working volume state of the compressor is matched with the control instruction; and determining that the compressor operates in fault in a case where the current working volume state of the compressor is not matched with the control instruction.