Control method of indoor fan of air conditioner, control device and air conditioner
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Solution Overview
Problem
Existing air conditioners face issues with frequent compressor start-stop cycles and localized overcooling due to fixed fan speeds, leading to reduced compressor lifespan and user discomfort during temperature maintenance modes.
Innovation Solution
A control method and device that dynamically adjusts the indoor fan operation based on compressor state and heat exchanger coil temperature, allowing reverse operation at varying speeds to maintain optimal cooling capacity and comfort, including electrostatic dust removal and adaptive exit strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the indoor fan operates at a fixed high speed to maintain cooling capacity, then the cooling effect is improved, but localized overcooling and user discomfort occur
Solution Approach 1:
The patent applies dynamics by making the indoor fan speed variable rather than fixed. The control device dynamically adjusts the fan speed based on real-time detection of coil temperature and return air temperature, allowing the system to maintain optimal cooling capacity while preventing localized overcooling when the coil temperature is low.
Solution Approach 2:
The patent changes the operational parameters of the indoor fan from a fixed state to a variable state. By adjusting fan speed as a parameter based on detected temperatures, the system can adapt cooling output to match actual thermal conditions, resolving the contradiction between maintaining cooling capacity and avoiding overcooling.
2Loss of energy
If the compressor frequently starts and stops to maintain temperature, then energy consumption is reduced, but compressor lifespan is reduced
Solution Approach 1:
The patent applies preliminary action by detecting coil temperature in advance and proactively adjusting fan speed before the compressor needs to cycle off. When the coil temperature indicates sufficient cooling capacity, the fan speed is reduced preemptively, allowing the compressor to run longer without causing overheating, thus reducing start-stop cycles and extending compressor lifespan.
Solution Approach 2:
The patent implements feedback control by continuously detecting coil temperature and return air temperature, then using this feedback to adjust fan speed. This closed-loop control prevents temperature fluctuations that would trigger compressor cycling, thereby reducing wear while maintaining energy efficiency.
3Productivity
If the indoor fan operates in reverse to enhance dust removal, then dust removal efficiency is improved, but dust dissemination may occur without proper control
Solution Approach 1:
The patent applies periodic action by implementing reverse fan operation as an intermittent function rather than continuous operation. The electrostatic dust removal mode activates the fan in reverse at specific intervals or under specific conditions, effectively removing dust from the heat exchanger while minimizing the risk of dust dissemination to the indoor environment.
Data Source
AI summary
The present application provides a control method and a control device of an indoor fan of an air conditioner, and an air conditioner. When the air conditioner operates in a cooling mode, when an indoor temperature reaches a set temperature, and it is detected that the number of times of frequent start-stop of a compressor is greater than or equal to the set number of times within a set time, it is determined that the air conditioner enters an operating stage of maintaining an indoor set temperature, and the compressor is no longer controlled to start and stop, but the indoor fan is controlled to operate in reverse at different rotational speeds based on different coil temperatures Tz of an indoor heat exchanger, an air volume output by the indoor fan is less than an air volume output when the indoor fan operates in forward.