Control method and apparatus for air conditioning compressor, and air conditioner
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Solution Overview
Problem
Conventional increasing frequency control of air conditioner compressors is inflexible, leading to mismatched compressor frequency with system load, resulting in shutdowns due to unsynchronized temperature and frequency changes.
Innovation Solution
A method and device that adjust compressor frequency based on actual coil temperature and predetermined correction values, switching between fast and slow increase rates to reduce hysteresis and stabilize compressor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor frequency is increased rapidly to raise the outlet air temperature to the target temperature, then the heating efficiency is improved, but the temperature change of the coil lags behind the frequency change, causing hysteresis and potential shutdown
Solution Approach 1:
The patent applies dynamics by making the compressor frequency adjustment adaptive rather than fixed. The control method dynamically adjusts the frequency increase rate based on real-time coil temperature feedback, switching between fast and slow increase rates to match the actual thermal response of the system, thereby resolving the contradiction between heating efficiency and operational stability
Solution Approach 2:
The patent implements feedback control by continuously monitoring the coil temperature and using it to adjust the compressor frequency increase rate. When the coil temperature reaches a predetermined threshold, the control method reduces the frequency increase rate to prevent hysteresis, ensuring the compressor operation remains synchronized with the actual thermal state of the system
2Device complexity
If a fixed frequency increase rate is used to simplify the control process, then the device complexity is reduced, but the compressor frequency becomes mismatched with the system load, leading to shutdowns
Solution Approach 1:
The patent transforms the static control approach into a dynamic one by introducing conditional logic that adjusts the frequency increase rate based on coil temperature thresholds. This dynamic adjustment mechanism maintains simplicity while improving reliability by adapting to real-time system conditions
Solution Approach 2:
The patent changes the control parameter (frequency increase rate) based on the system state (coil temperature). By switching between different frequency increase rates (fast and slow) according to whether the coil temperature exceeds a predetermined threshold, the system achieves better matching between compressor frequency and system load without excessive complexity
Data Source
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AI summary
A control method for an air conditioning compressor, comprising: obtaining a first correction temperature according to a first actual temperature reduction correction of an inner coil; when the first correction temperature is less than a first preset temperature, controlling a compressor to perform an up-frequency operation at a first up-frequency rate; and when a first correction temperature' is greater than or equal to the first preset temperature, and when a first temperature difference is greater than or equal to a first set temperature difference, controlling the compressor to perform an up-frequency operation at a second up-frequency rate. Further provided are a control apparatus for an air conditioning compressor, and an air conditioner. At up-frequency operation stages of a compressor, the temperature rise within a set detection interval duration is used as a switching parameter of a fast up-frequency operation and a slow up-frequency operation, the degree of lag between the inner coil temperature and compressor frequency increase is reduced, compressor shutdown is prevented from occurring due to the frequency of the compressor increasing too quickly, the actual temperature of the inner coil can also undergo amplitude reduction correction, and the stability of the compressor is improved.