Refrigerant Charge Diagnosis Using Adaptive Suction Pressure Control
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Solution Overview
Problem
Existing air conditioner systems face challenges in efficiently judging the adequacy of refrigerant quantity in the refrigerant circuit, often resulting in prolonged or unstable refrigerant quantity judging operations due to difficulties in maintaining constant pressure at the compressor's suction side, especially under varying installation conditions.
Innovation Solution
The system incorporates an operation controlling means, stability judging means, and condition changing means to perform refrigerant quantity judging operations, adjusting target control values and operation states to ensure stabilization, thereby reducing operation time and ensuring completion, even under challenging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure at the suction side of the compressor is controlled to be constant during the refrigerant quantity judging operation, then the refrigerant quantity judging operation can be performed accurately, but the operation time is prolonged and the operation may fail to complete under unstable conditions
Solution Approach 1:
The patent applies dynamics by making the control system adaptable to changing conditions. The control unit dynamically adjusts the refrigerant quantity judging operation based on detected stability of operating parameters. When parameters stabilize, the operation proceeds; when they fluctuate, the operation is suspended or restarted, allowing the system to respond flexibly to real-time conditions rather than rigidly maintaining constant pressure throughout.
Solution Approach 2:
The patent changes the control parameter from strictly maintaining constant pressure to monitoring parameter stability over time. The control unit evaluates whether operating parameters have stabilized within acceptable ranges before proceeding with the refrigerant quantity judgment, effectively changing from a static pressure control approach to a dynamic stability assessment approach.
2Adaptability or versatility
If the refrigerant quantity judging operation is performed under varying installation conditions, then the air conditioner can be installed flexibly, but the pressure at the suction side of the compressor cannot be maintained constant
Solution Approach 1:
The system dynamically adapts to different installation conditions by monitoring the stability of operating parameters rather than requiring constant pressure. The control unit adjusts the judging operation based on actual system behavior under varying conditions, allowing flexible installation while maintaining judgment accuracy through adaptive control timing.
Solution Approach 2:
The patent changes the approach from controlling pressure to a fixed value to monitoring whether parameters stabilize within acceptable ranges. This allows the system to accommodate varying installation conditions while still performing accurate refrigerant quantity judgment by assessing parameter stability rather than enforcing constant pressure.
3Productivity
If the refrigerant quantity judging operation is continuously performed under unstable conditions, then the operation may complete, but the judgment result becomes unreliable
Solution Approach 1:
The patent implements feedback by continuously monitoring operating parameters and using this information to control the refrigerant quantity judging operation. The control unit receives feedback on parameter stability and adjusts the operation accordingly - suspending or restarting the operation based on whether parameters have stabilized, ensuring reliable judgment results while maintaining operational efficiency.
Solution Approach 2:
The system dynamically adjusts the judging operation based on real-time feedback from parameter monitoring. Rather than continuously performing the operation regardless of conditions, the system adapts its timing and execution based on observed stability, balancing completion rate with result reliability through dynamic control decision-making.
Data Source
AI summary
An air conditioner includes a refrigerant circuit, an operation controlling section, a stability judging section, a refrigerant quantity judging section, and a condition changing section. The operation controlling section is capable of performing a refrigerant quantity judging operation to control constituent equipment to reach a predetermined target control value. The stability judging section judges whether or not the refrigerant quantity judging operation has stabilized. The refrigerant quantity judging section judges the adequacy of the refrigerant quantity in the refrigerant circuit by using an operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit when it is judged that the refrigerant quantity judging operation has stabilized. The condition changing section changes the target control value in the refrigerant quantity judging operation when it is judged that the refrigerant quantity judging operation has not stabilized.