Differential control method for air inlet gears of fresh air system

Abstract

The invention discloses a differential control method for air inlet gears of a fresh air system. According to the differential control method, differential control is suitable for being executed in a controller of the fresh air system. The differential control method comprises the following steps that air inlet gears of a purifying machine include the zero gear, the first gear, the second gear and the third gear; a threshold value A, a threshold value B, a threshold value C, a threshold value D and a threshold value E are set for CO2 concentration measurement values within the measurement range; and comprehensive judgment is conducted according to the current gear and the CO2 concentration measurement values within a period of time, and differential control is conducted for the air inlet gears. According to the differential control method for the air inlet gears of the fresh air system, shifting between all the gears is not controlled according to only one threshold value stand anymore and is comprehensively judged according to the current gear and the CO2 concentration measurement values within a period of time, so that the technical problem that a fan is switched continuously due to frequency gear shifting when the value of a sensor jumps around a threshold value is solved, differential control is achieved for the air inlet gears of the fresh air system, the service life of fresh air purification equipment is prolonged, noise generated by frequent gear shifting is lowered, and the comfort in use is improved for users.

Description

technical field [0001] The invention relates to the technical field of the fresh air system, in particular to a control method for the differentiation of the intake gears of the fresh air system. Background technique [0002] The fresh air system has been widely used in homes, schools, large office areas and dust-free industries. The fresh air system purifies the external air pollutants PM2.5, formaldehyde, toluene, TVOC, dust, pollen and other allergens, and the treated clean air is sent into the room, while the indoor dirty air and high concentration of CO 2 Exhaust outside. CO 2 Excessive concentration will make people feel uncomfortable due to lack of oxygen, which can cause dizziness, headache, tinnitus, vertigo, nausea and vomiting, and even suffocation. The World Health Organization stipulates the healthy housing standard: CO 2 Concentration needs to be lower than 1000PPM. According to the recommendations of ASHRAE (American Society of Heating, Refrigerating and ...

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Problems solved by technology

[0003] Since the data collected by the sensor of the fresh air system fluctuates with the concentration of the environmental detection substance, when the sensor data is used to automatically control the intake gear of the fresh air purifier, it is often encountered that the sensor data jumps up and down the gear threshold, which leads to The frequent switching of the air intake gear of the purifier will cause the following problems: 1. The constant switching of the gear position will cause the voltage to fluctuate, which will have a greater impact on the internal circuit of the purifier, resulting in serious aging of the evolutionary equipment; 2. The constant switching of the gear position control The fan motor is constantly switched, and the current fluctuates greatly, causing the motor speed to be fast and sometimes slow, which affects the service life of the motor; 3. When the gear is low, the noise of the fresh air system motor is small, and when it is high, the motor noise is large, and the continuous switching of gears causes noise fluctuations Larger, which affects the user's comfort; 4. The data collected when the sensor fails is not the real concentration of environmental detection objects or pollutants. Due to the sensor failure, the air intake gear of the fresh air system is misoperated, causing distortion of the indoor environment control

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