Air volume correction control method and device for air conditioner indoor unit and multi-split air conditioning unit
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Solution Overview
Problem
Existing air volume correction methods for air conditioner indoor units are inefficient and inaccurate due to variations in static pressure caused by factors like air return box shape, filter blockage, and duct length, leading to energy waste and reduced performance.
Innovation Solution
A method and device that preset and adjust the rotation speed of the air conditioner indoor unit by calculating the minimum power deviation between sampled and actual power, allowing for precise static pressure determination and correction, regardless of constant air volume, thereby improving efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dial is used to select preset rotation speeds for air volume correction, then the control method is simple, but the number of preset rotation speeds is limited and air volume cannot be corrected accurately due to variable static pressure
Solution Approach 1:
The patent transforms the static preset rotation speed approach into a dynamic correction method. The control device dynamically determines the correction value by comparing actual static pressure with standard static pressure, and dynamically adjusts the rotation speed based on this correction value. This dynamic approach allows accurate air volume correction across varying static pressure conditions while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent implements a feedback mechanism where the actual static pressure is measured and compared with the standard static pressure to determine a correction value. This correction value is then used to adjust the rotation speed. The feedback loop ensures that the rotation speed is continuously optimized based on actual operating conditions, resolving the contradiction between simple control and accurate correction.
2Stability of the object's composition
If multiple determination and debugging steps are performed to maintain constant air volume, then the air volume can be kept constant, but the process is time-consuming and has low operating efficiency
Solution Approach 1:
The patent replaces complex mechanical debugging processes with an automated electronic control system. The control device automatically determines the correction value based on static pressure comparison and automatically adjusts the rotation speed accordingly. This substitution eliminates the need for manual determination and debugging steps, maintaining air volume stability while significantly improving operating efficiency.
Solution Approach 2:
The control device performs self-adjustment by automatically comparing actual static pressure with standard static pressure, calculating the correction value, and adjusting the rotation speed without external intervention. This self-service capability maintains constant air volume while eliminating time-consuming manual debugging, thereby improving productivity.
3Measurement precision
If static pressure data is acquired through traditional measurement methods, then the measurement can be performed, but the difficulty of acquisition is high and the precision is insufficient
Solution Approach 1:
The patent introduces power consumption as an intermediary parameter to indirectly measure static pressure. Instead of directly measuring static pressure with complex sensors, the system measures the power consumption of the fan motor, which correlates with the static pressure conditions. This intermediary approach simplifies the measurement process while providing sufficient precision for air volume correction.
Solution Approach 2:
The patent replaces difficult mechanical static pressure measurement with electrical power consumption measurement. By measuring the electrical power consumed by the fan motor under different operating conditions, the system can infer static pressure information more easily and with adequate precision, reducing both acquisition difficulty and improving effectiveness.
Data Source
AI summary
An air conditioner indoor unit air volume correction control method includes: presetting a preset rotation speed; setting a sampled rotation speed Fs, and collecting corresponding sampled powers when operating in different static pressure intervals at the sampled rotation speed Fs and in the condition of a constant air volume, and recording them as a sampled power data set Ws; operating the air conditioner indoor unit at the sampled rotation speed Fs, and collecting in real time an actual power Ws′ when operating at the sampled rotation speed Fs; calculating a power deviation rate e based on the sampled power data set Ws and the actual power Ws′; and acquiring a minimum power deviation rate emin through comparison, and acquiring the actual static pressure value and the preset rotation speed Fx corresponding to the actual static pressure value based on the sampled power corresponding to the minimum power deviation rate emin.