Air Conditioner Outdoor Fan Control Using Stored Temperature Data
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Solution Overview
Problem
Air conditioners face issues with inaccurate outside temperature measurement when the outdoor fan is stopped or repeatedly started, leading to ineffective control during extreme cold temperatures, as the compressor may seize due to lack of differential pressure and oil circulation, causing outside air stagnation around the heat exchanger.
Innovation Solution
An air conditioner system with a temperature sensor, memory, and controller that implements holding control to prevent updating the outside temperature when the outdoor fan is stopped or repeatedly started, ensuring accurate temperature detection by periodically driving the fan to prevent air stagnation and maintain compressor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outdoor fan is stopped or repeatedly started and stopped to prevent compressor seizure at temperatures equal to or lower than -20°C, then the compressor is protected from damage, but the outside air stagnates around the outdoor heat exchanger causing inaccurate outside temperature measurement
Solution Approach 1:
The controller stores the outside temperature detected while the outdoor fan is being driven in advance, before the fan is stopped or repeatedly started to protect the compressor. This pre-stored temperature data is then used for control decisions during periods when the fan is not running, ensuring accurate temperature measurement is maintained without compromising compressor protection.
2Measurement precision
If the outdoor fan is driven continuously to maintain accurate outside temperature measurement, then the outside temperature is accurately detected, but the compressor may be seized due to lack of differential pressure and oil circulation at temperatures equal to or lower than -20°C
Solution Approach 1:
The controller uses feedback from the outdoor fan's operational status to determine when to store temperature data. When the outdoor fan is driven, the controller stores the detected outside temperature; when the fan is stopped or repeatedly started for compressor protection, the controller uses the previously stored temperature data for control decisions, creating a feedback mechanism that balances measurement accuracy with compressor safety.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution prevents the air conditioner from being controlled based on inaccurate outside temperatures, ensuring accurate temperature detection and compressor operation even at low temperatures by maintaining compressor and fan operation, thus enhancing control precision and reliability.
Implementation Method 1
a temperature sensor configured to detect an outside temperature
Implementation Method 2
the outdoor fan is driven, the outside air stagnates around the outdoor heat exchanger
Data Source
AI summary
An air conditioner of the present invention includes: a compressor; an outdoor fan; a temperature sensor configured to detect an outside temperature; a memory configured to store the outside temperature detected by the temperature sensor; and a controller configured to conduct holding control of not updating the outside temperature stored in the memory, when the compressor is being driven and the outdoor fan is stopped or is repeatedly started and stopped after the outside temperature detected by the temperature sensor is stored in the memory while the outdoor fan is being driven.