Control method and device of multi-tube air conditioner, air conditioner and storage medium
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Solution Overview
Problem
The minimum limited opening of current multi-tube air conditioners is a fixed value, leading to unstable operation due to unreasonable settings, causing issues such as low refrigerant flow, compressor reliability problems, and system shutdowns.
Innovation Solution
A control method that dynamically adjusts the electronic expansion valve's opening based on acquired exhaust, evaporation, and condensation temperatures, determining a target opening and minimum limited opening to maintain stable operation by avoiding unreasonable settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the minimum limited opening of the electronic expansion valve is set to a fixed small value, then the refrigeration output can be increased, but the refrigerant flow becomes unstable causing low-pressure protection trips and system shutdowns
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed minimum limited opening to a dynamic adaptive minimum limited opening that changes based on real-time operating conditions. The controller adjusts the minimum limited opening according to compressor frequency, exhaust temperature, and evaporation temperature, allowing the system to adapt to varying load conditions and maintain both high refrigeration output and system stability.
Solution Approach 2:
The patent implements parameter changes by modifying the minimum limited opening parameter based on operating conditions. When compressor frequency is high and exhaust temperature is low, the minimum limited opening is increased to ensure stable refrigerant flow. When frequency is low or temperature conditions differ, the minimum limited opening is adjusted accordingly, preventing system shutdowns while maintaining efficiency.
2Reliability
If the minimum limited opening of the electronic expansion valve is set to a fixed large value, then system stability is improved, but the refrigeration output is reduced due to incomplete evaporation and liquid slugging
Solution Approach 1:
The system uses dynamics to adjust the minimum limited opening based on real-time conditions rather than using a fixed large value. The controller continuously monitors compressor frequency, exhaust temperature, and evaporation temperature to determine the appropriate minimum limited opening, enabling the system to achieve both stability and high refrigeration output under different operating conditions.
Solution Approach 2:
The patent changes the minimum limited opening parameter dynamically based on operating conditions. Instead of maintaining a fixed large value that limits refrigeration output, the system adjusts the minimum limited opening to be large only when necessary for stability (high frequency, low temperature conditions) and smaller when conditions allow for greater output, thus resolving the contradiction between reliability and productivity.
3Productivity
If the electronic expansion valve opening is reduced to minimum for high cooling capacity demand, then refrigeration output increases, but refrigerant flow becomes unstable causing low-pressure protection trips
Solution Approach 1:
The patent applies parameter changes by adjusting the minimum limited opening based on compressor frequency and temperature conditions. When cooling capacity demand is high and compressor frequency is high, the minimum limited opening is increased to maintain stable refrigerant flow while still allowing sufficient cooling capacity. This prevents low-pressure protection trips while meeting high cooling demands.
Solution Approach 2:
The system uses feedback by continuously monitoring compressor frequency, exhaust temperature, and evaporation temperature to adjust the minimum limited opening. This closed-loop control ensures that the minimum limited opening is optimized for both refrigerant flow stability and cooling capacity, preventing system shutdowns while maintaining high performance.
Data Source
AI summary
A control method of a multi-tube air conditioner includes acquiring an exhaust temperature of a compressor of the multi-tube air conditioner and an evaporation temperature of a target indoor unit of the multi-tube air conditioner in response to detecting the multi-tube air conditioner being in a target operation state, determining a target opening of an electronic expansion valve of the target indoor unit according to the exhaust temperature and the evaporation temperature, acquiring a condensation temperature of the multi-tube air conditioner, determining a minimum limited opening of the electronic expansion valve according to the condensation temperature and the exhaust temperature, and adjusting an opening of the electronic expansion valve according to the target opening and the minimum limited opening.