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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  • Abstract
  • Description
  • Claims
  • Application Information

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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. The control method comprises the steps that a PMW control signal is generated, and a voltage value output by the PM2.5 sensor is read according to a set period; the concentration of PM2.5 dust is calculated according to the read voltage value output by the PM2.5 sensor; air quality is judged according to the concentration of the PM2.5 dust; a PWM period is set according to a judgment result of air quality, and when the concentration of the PM2.5 dust is higher than an upper limit threshold value of the concentration, the PWM period is adjusted according to the change rate of the concentration of the PM2.5 dust. The invention further provides a control device for the PM2.5 sensor. The control device comprises 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 control method and device have the advantages that an intermittent working mode is adopted for improving the effective use efficiency of a light emitting source of the PM2.5 sensor, and continuous use time of the light emitting source of the PM2.5 sensor is shortened on the premise of ensuring sampling precision, so that the service life of the PM2.5 sensor is prolonged, and application cost is reduced.

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
CPCG01N15/06G01N2015/0693
Inventor 李乐铭柳达云陈志方吕旭君陈震
Owner FORYOU GENERAL ELECTRONICS
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