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A kind of control method and device of PM2.5 sensor

A control method and sensor technology, applied in the direction of measuring devices, scientific instruments, suspension and porous material analysis, etc., to achieve the effect of reducing application costs, reducing continuous use time, and prolonging service life

Active Publication Date: 2018-12-04
FORYOU GENERAL ELECTRONICS
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  • Claims
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Problems solved by technology

[0005] The invention provides a PM2.5 sensor control method and device, which solves the problem of prolonging the service life of the PM2.5 sensor by using an intermittent pulse control mode while ensuring sampling accuracy

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  • A kind of control method and device of PM2.5 sensor
  • A kind of control method and device of PM2.5 sensor
  • A kind of control method and device of PM2.5 sensor

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Embodiment Construction

[0037] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. The accompanying drawings are only for reference and description, and do not constitute a limitation to the protection scope of the present invention.

[0038] like figure 1 , 2 As shown, this embodiment provides a control method for PM2.5 sensors, including:

[0039] Step 1: Initialize, set the period of the PWM control signal as T (such as 1s), and the duration of the high level as t1 (such as 30ms, the duty cycle D=t1 / T), generate the PWM control signal, every other cycle time T Read the voltage value output by the PM2.5 sensor once;

[0040] Step 2: If image 3 As shown, the set time t2 (such as 20ms) is delayed at the high level of one cycle of the PWM control signal, and then the voltage value Vo output by the PM2.5 sensor is read. The set time of the delay is less than one cycle of the PWM control signal The high level duration of the c...

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Abstract

The invention provides a control method for a PM2.5 sensor, which includes: generating a PWM control signal, reading the voltage value output by the PM2.5 sensor according to a set period; and calculating PM2 based on the read voltage value output by the PM2.5 sensor. 5 dust concentration; judge the air quality based on the PM2.5 dust concentration; set the PWM cycle based on the air quality judgment result. When the PM2.5 dust concentration is higher than the concentration upper limit threshold, the PWM cycle is adjusted according to the change rate of the PM2.5 dust concentration. . The invention also provides a control device for a PM2.5 sensor, which includes a PWM generation module, a PM2.5 sensor module, a PM2.5 concentration calculation module, a PM2.5 concentration judgment module, and a PWM setting module. The beneficial effects obtained by the present invention are: improving the effective use efficiency of the PM2.5 sensor light source through intermittent working mode, and reducing the continuous use time of the PM2.5 sensor light source on the premise of ensuring sampling accuracy, thereby extending its use lifespan and reduced application costs.

Description

technical field [0001] The invention relates to the technical field of PM2.5 detection, in particular to a control method and device for a PM2.5 sensor. Background technique [0002] The PM2.5 sensor is a device used to detect the concentration of PM2.5 in the ambient air. PM2.5 refers to fine particles with an aerodynamic equivalent diameter less than or equal to 2.5 microns in the ambient air. [0003] Existing air quality monitoring and purification devices such as PM2.5 detectors, air purifiers and fresh air systems use PM2.5 sensors to detect the dust concentration in the air. Commonly used dust sensors are mainly detected by the light scattering method, which can be divided into infrared sensors and laser sensors according to different light sources. Because the particle signal scattered by infrared LED light is weak, only particles above 1um can be detected. Since laser sensors can detect particles above 0.3um, they are widely used in the field of PM2.5 detection. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06
CPCG01N15/06G01N15/075
Inventor 李乐铭柳达云陈志方吕旭君陈震
Owner FORYOU GENERAL ELECTRONICS
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