Ventilation system control method and device and air conditioner

Abstract

The invention provides a ventilation system control method and device and an air conditioner. The method comprises the steps that the indoor carbon dioxide concentration is obtained; a ventilation unit is controlled to be started according to the indoor carbon dioxide concentration, and fresh air is introduced an indoor; after the ventilation is started, the ventilation unit is controlled to be closed according to the indoor carbon dioxide concentration and the carbon dioxide concentration change trend; and the carbon dioxide concentration change trend is obtained by detecting a first-order derivative f (x) of the carbon dioxide concentration. By arranging a carbon dioxide concentration sensor and the ventilation unit, the indoor carbon dioxide concentration is detected in real time, the first-order derivative of the carbon dioxide concentration is accurately calculated, the indoor carbon dioxide concentration change can be accurately and reliably fed back in real time, the ventilationunit is accurately regulated and controlled to introduce outdoor fresh air into the indoor, and the ventilation unit is controlled to be opened and closed; erroneous judgment caused by abnormal signals is avoided, the data accuracy and stability are effectively guaranteed, and the indoor air quality is improved.

Description

technical field [0001] The present invention relates to the technical field of air conditioning, in particular to a fresh air system control method, device and air conditioner. Background technique [0002] As people become more and more comfortable with air conditioners, they not only pay attention to temperature and humidity, but also pay attention to the air quality in the room, such as PM2.5, air turbidity, carbon dioxide concentration, etc. The density of carbon dioxide is higher than that of air. When there is less carbon dioxide There is no harm to the human body, but when it exceeds a certain amount, it will affect the breathing of people (and other organisms as well), because the concentration of carbonic acid in the blood increases, the acidity increases, and acidosis occurs. When the volume fraction of carbon dioxide in the air is 1%, you will feel shortness of breath, dizziness, and heart palpitations; when it is 4%-5%, you will feel dizzy; Therefore, the comfor...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a fresh air system control method, device and air conditioner to solve the problem in the prior art that the opening and closing time of the fresh air system can be precisely controlled and affect user experience

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