CN106442252A - Method and system for detecting filth blockage in dust filtration mesh for filtering ambient light and household appliances - Google Patents
Method and system for detecting filth blockage in dust filtration mesh for filtering ambient light and household appliances Download PDFInfo
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- CN106442252A CN106442252A CN201610796353.6A CN201610796353A CN106442252A CN 106442252 A CN106442252 A CN 106442252A CN 201610796353 A CN201610796353 A CN 201610796353A CN 106442252 A CN106442252 A CN 106442252A
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- dirty stifled
- value
- filtrating screen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0846—Investigating permeability, pore-volume, or surface area of porous materials by use of radiation, e.g. transmitted or reflected light
Abstract
The invention relates to the field of photoelectric detection, and particularly relates to a method and system for detecting filth blockage in a dust filtration mesh for filtering ambient light and household appliances. The method comprises the steps of obtaining a first filth blockage value of the dust filtration mesh under the irradiation of the ambient light; obtaining a second filth blockage value of the dust filtration mesh under the irradiations of both the ambient light and detection light; calculating a difference value of the first filth blockage value and the second filth blockage value, and generating a third filth blockage value of the dust filtration mesh. According to the method and system, influence of the ambient light on a detection result can be totally eliminated during a detection process, not only is the detecting method simple and accurate, but also the filth blockage value of the dust filtration mesh can be directly obtained, thus the filth blockage degree of the dust filtration mesh can be judged, corresponding control over the household appliances can be conducted according to a judgment result, the functions of the household appliances are enriched, and use satisfaction degree of a user is improved.
Description
Technical field
The present invention relates to field of photodetection, particularly to a kind of dirty stifled detection method of dirt filtrating screen of filtering environmental light, it is
System and household electrical appliance.
Background technology
Increasingly mature with photoelectric technology, Photoelectric Detection also gets more and more in the application of every field.General detection is former
Reason is that light-sensitive element, as photoreceptor, shows difference using light-sensitive element under different illumination intensity as light source with luminous tube
The feature of electrical characteristics (electric current, resistance etc.), converts optical signal into electric signal and is easy to detection and processes.In detection, it is detected
Light that body sends to light source produces certain impact, such as reflection, scattering, absorb etc., make light and light that photo detector detects
There is certain difference in the light that source sends, reflect the situation of detected body using this difference.
But, the light that the light that photo detector senses sends except light source, it is accompanied by the ring in detection means local environment
Visible ray that border light, such as daylight, light produce etc..These light are different with the difference of detected body Location, and, even if
In same place, change over time, ambient light also varies constantly.But detection program is general with the data result demarcated
It is fixing, thus, the presence of ambient light and change make testing result there is certain deviation, even can cause detection knot when serious
The distortion of fruit.
For avoiding problem above, conventional method has：Shell using detection means carries out shading；Using infraluminescence pipe and
Infrared photo detector；Limit the methods such as testing conditions.First method is to reduce light-emitting device to send out with infrared rays receiver shell as far as possible
Light and the area of light slit, because during general detection, light-emitting device is close together with infrared rays receiver, thus this method is permissible
Play certain effect avoiding ambient light impact, but can not be completely eliminated.Although second method farthest avoids
The interference of visible ray, but in ambient light, do not only exist visible ray, light, daylight equally produce infrared light, all heat source thermo
Will irradiating infrared light.It is additionally, since the continuity of optical wavelength, infrared photo detector also can sense certain visible ray.The
Three kinds of methods are only to be detected under dark surrounds, are such as only detected at night.This method farthest avoids
The impact of visible ray, but due to limited by testing conditions, there is very big drawback, the impact of infrared light equally also cannot be evaded.
Content of the invention
The invention provides a kind of dirty stifled detection method of the dirt filtrating screen of filtering environmental light, system and household electrical appliance, solve
Above technical problem.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：
According to one aspect of the present invention, there is provided a kind of dirty stifled detecting system of the dirt filtrating screen of filtering environmental light, including the
One acquisition module, the second acquisition module and computing module,
Described first acquisition module is used for obtaining the first dirty stifled value that ambient light irradiates lower dirt filtrating screen；
Described second acquisition module is used for obtaining the second dirty stifled value of dirt filtrating screen under ambient light and detection light common irradiation；
Described computing module is used for calculating the described second dirty stifled value and the difference of the first dirty stifled value, generates the 3rd of dirt filtrating screen the
Dirty stifled value.
According to another aspect of the present invention, there is provided a kind of dirty stifled detection method of the dirt filtrating screen of filtering environmental light, utilize
The dirty stifled detecting system of dirt filtrating screen of described filtering environmental light, method comprises the following steps：
Step 1, obtains the first dirty stifled value that ambient light irradiates lower dirt filtrating screen；
Step 2, obtains the second dirty stifled value of dirt filtrating screen under ambient light and detection light common irradiation；
Step 3, calculates the difference of the described second dirty stifled value and the first dirty stifled value, generates the 3rd dirty stifled value of dirt filtrating screen.
In order to solve described technical problem, present invention also offers a kind of household electrical appliance, including described filtering environmental light
The dirty stifled detecting system of dirt filtrating screen.
The invention has the beneficial effects as follows：The present invention can filter the shadow to testing result for the detection process ambient light completely
Ring, not only detection method is simple, testing result accurately, and can directly obtain the dirty stifled value of dirt filtrating screen, thus dirty to dirt filtrating screen
Stifled degree is judged, and according to judged result, household electrical appliance can be controlled accordingly, enriches the function of household electrical appliance,
Improve users' satisfaction degree.
Brief description
Fig. 1 is a kind of structural representation of the dirty stifled detecting system of dirt filtrating screen of filtering environmental light of embodiment 1；
Fig. 2 is a kind of structural representation of dirty stifled detector unit of embodiment 1；
Fig. 3 is a kind of structural representation of dirty stifled detector unit of embodiment 2；
Fig. 4 is a kind of schematic flow sheet of the dirty stifled detection method of dirt filtrating screen of filtering environmental light of embodiment 3；
Fig. 5 is a kind of structural representation of household electrical appliance of embodiment 4；
In above-mentioned accompanying drawing, each label is specially：
1st, single-chip microcomputer, 2, first switch control circuit, 3, infrarede emitting diode, 4, photodiode, 5, power supply unit,
6th, connector, 7, dirt filtrating screen, 8, detector unit, 9, transmitting receiving unit, 10, second switch control circuit.
Specific embodiment
Below in conjunction with accompanying drawing, the principle of the present invention and feature are described, example is served only for explaining the present invention, and
Non- for limiting the scope of the present invention.
As shown in figure 1, being a kind of structural representation of the dirty stifled detecting system of dirt filtrating screen of filtering environmental light of embodiment 1, bag
Include the first acquisition module, the second acquisition module and computing module,
Described first acquisition module is used for obtaining the first dirty stifled value that ambient light irradiates lower dirt filtrating screen；
Described second acquisition module is used for obtaining the second dirty stifled value of dirt filtrating screen under ambient light and detection light common irradiation；
Described computing module is used for calculating the described second dirty stifled value and the difference of the first dirty stifled value, generates the 3rd of dirt filtrating screen the
Dirty stifled value.
By the dirty stifled detecting system of the above dirt filtrating screen of the present embodiment 1, you can visible ray completely in filtering environmental or
Infrared light, obtains the dirty stifled data of accurate dirt filtrating screen.All include in first acquisition module of the present embodiment 1 and the second acquisition module
Dirty stifled detector unit.
As described in Figure 2, it is a kind of structural representation of dirty stifled detector unit of the present embodiment 1, connect including by connector 6
Transmitting receiving unit 9 and detector unit 8, and the and power supply unit 5 that connects of described detector unit 8；Described detector unit 8 is wrapped
Include for launching the Optical Transmit Unit of detection light and the light-sensitive element for receiving the transmitted light through dirt filtrating screen 7 to dirt filtrating screen,
In the present embodiment, described Optical Transmit Unit is infrarede emitting diode 3, and light-sensitive element is photodiode 4.In the present embodiment,
Described transmitting receiving unit 9 includes single-chip microcomputer 1, first switch control circuit 2 and is used for the photoelectric current conversion of photodiode 4
For the change-over circuit of voltage, the first I/O port connection first switch control circuit 2 of described single-chip microcomputer 1, first switch controls electricity
Road 2 connects described infrarede emitting diode 3 by connector 6, and described change-over circuit connects the simulation input port of single-chip microcomputer 1.
In other embodiments, the photodiode in the present embodiment can also be substituted using phototriode, it is very good to be likewise supplied with
Detection results.In the present embodiment, described change-over circuit includes the resistance R4 connecting with described light-sensitive element, resistance R4 with described
The series connection end of light-sensitive element is simultaneously connected with the simulation input port of described single-chip microcomputer 1, and the resistance R4 other end is grounded.The present embodiment
Dirty stifled detector unit, reflects dirty stifled value by the translucency detecting dirt filtrating screen, receives intensity of illumination according to light-sensitive element simultaneously
Different and produce the characteristic of different photoelectric currents, intensity of illumination is converted into concrete numerical value, in order to the dirty stifled value of intuitive judgment dirt filtrating screen
Degree.The structure of the present embodiment is simple, only includes detector unit, transmitting receiving unit and three parts of power supply unit, and detects single
Unit and transmitting receiving unit only need to can achieve transmitting and the reception of signal by two connecting lines, then a plus connection power supply
The connecting line of unit can achieve whole detection scheme, therefore decreases connecting line, reduces cost and is easily installed.
In the present embodiment, the base stage of the triode Q1 in described first switch control circuit is connected to single-chip microcomputer through resistance R1
The first I/O port, colelctor electrode is connected to described Optical Transmit Unit through resistance R3, transmitting collection ground connection.The base stage of described triode Q1
It is grounded after also series connection pull down resistor R2.The present embodiment adopts transistor switching circuit, opens when needing detection luminous, is being not required to
Close when detecting, not only control circuit is simple, and can at utmost saving energy consumption.Meanwhile, in the present embodiment, triode
Colelctor electrode be connected to infrarede emitting diode LED through resistance R3, described resistance R3 be LED current limiting safeguard resistor, Ke Yibao
Suitable electric current is flow through, the effect improving the present embodiment protects infrarede emitting diode not because electric current is excessive simultaneously in card LED
Damage.
First I/O port output low and high level signal of the present embodiment single-chip microcomputer 1, controls three poles by low and high level signal
Pipe Q1 conducting turns off thus being energized to infrarede emitting diode LED, the infrared detection light transmission dirt filtrating screen that LED sends, and wherein one
The dust that partly light is adhered to due to dirt filtrating screen 7 cannot pass through dirt filtrating screen to effects such as the reflection of light, scattering, absorptions, so that
Through light reduce, and adhesive dust is more, and the light of transmission is fewer.Photodiode 4 is light-sensitive element, is irradiated to thereon
Light is more, bigger by its photoelectric current, and it is connected with resistance R4, can be changed photoelectric current using Ohm's law u=ir
Become voltage, by gathering resistance R4 both end voltage, and be transferred to single-chip microcomputer, then utilize the built-in analog-digital converter of single-chip microcomputer 1,
Analog voltage signal digital voltage value be can be converted into, and the dirty stifled value of dirt filtrating screen, in the present embodiment, resistance represented with this value
R4 both end voltage is bigger, and single-chip microcomputer is converted into that digital voltage value is bigger, illustrates that appeared intensity of illumination is bigger, dirt filtrating screen 1 is dirty
Stifled situation is slighter.The present embodiment testing result accurately, can need to install the family of dirt filtrating screen in air-conditioning, air cleaner etc.
It is mounted directly use in electrical appliance, have wide range of applications.
As shown in figure 3, the structural representation of a kind of dirty stifled detector unit for embodiment 2, compared with Example 1, increase
For the second switch control circuit 10 controlling light-sensitive element to turn on and off, second switch control circuit connects single-chip microcomputer
Second I/O port, controls opening and turning off of second switch control circuit by the low and high level signal of corresponding I/O port output.
Not dirty to dirt filtrating screen stifled detect when, can with this circuit of reliable turn-off, with respect to the unit not having this ON-OFF control circuit,
Avoid and irradiate power consumption on transmitting receiving unit for the photoelectric current producing during light-sensitive element in non-detection time ambient light.
Described second switch control circuit 10 is transistor switching circuit, including triode Q2, resistance R6 and resistance R7, described triode
The base stage of Q2 is connected to the second I/O port of single-chip microcomputer through resistance R6, and colelctor electrode is connected to described light-sensitive element and electricity through resistance R4
The series connection end of resistance R5, transmitting collection ground connection.The base stage of described triode Q1 is also connected and is grounded after pull down resistor R7.Opened using triode
Close circuit, open when needing detection luminous, close when not needing detection, not only control circuit is simple, and can be maximum
Degree saving energy consumption.
In the present embodiment, described first switch control circuit, second switch control circuit and change-over circuit are all integrated in master
In control plate, master control borad is additionally provided with power supply unit 5, said supply unit 5 connects described infrarede emitting diode and photoelectricity respectively
Diode, for being described infrarede emitting diode and photodiode is powered.Said supply unit is five volts of voltage regulation filtering
Power supply.In the present embodiment, external device only includes Optical Transmit Unit and light-sensitive element, and remaining control circuit part is arranged in
On master control borad, only need two connecting lines to can achieve transmitting and the reception of signal simultaneously, then a plus company connecting power supply unit
Wiring can achieve whole detection scheme, therefore decreases connecting line, takes up room little it is easy to implementing and reducing cost.
Optical Transmit Unit and light-sensitive element small volume, greatly reduce and take up room simultaneously, thus reducing external device to dirt filtrating screen
The impact of adhesive dust is it is ensured that the accuracy of testing result.Power supply unit is simple simultaneously, need not complicated power supply, only need mainboard
5v powers.By the electric capacity C1 of a ground connection in parallel on power supply, galvanic noise jamming can be removed, make confession
Electricity is cleaner, reduces noise.
In the present embodiment, described single-chip microcomputer comprises analog-digital converter, the analog input end through single-chip microcomputer for the described change-over circuit
Mouth is connected to described analog-digital converter, using analog-digital converter, voltage analog signal is converted into data signal, in order to detect
The illumination intensity information going out, therefore not only can obtain simply dirty stifled or non-dirty stifled testing result, and can obtain
The dirty stifled value of dirt filtrating screen, thus facilitate information processing and the judgement to this information for the other functions.In the present embodiment, described single-chip microcomputer
The output pin of analog-digital converter at meet the electric capacity C2 of a resistance R5 ground connection in parallel again, current limliting and decoupling can be played
Effect.
In other embodiments, can also be detected by the intensity of illumination receiving through the irreflexive reflected light of dirt filtrating screen
The dirty stifled value of dirt filtrating screen, the structure of its detector unit and embodiment 1, embodiment 2 dirty stifled detector unit essentially identical it is only necessary to
Described photodiode is changed into for receiving photodiode or the photoelectricity through the irreflexive reflected light of the dust filtration net
Triode.In this embodiment, the resistance both end voltage connected with photodiode or phototriode is bigger, monolithic
Machine is converted into that digital voltage value is bigger, illustrates that dust that reflected intensity of illumination is bigger, on dirt filtrating screen etc. is more, dirt filtrating screen
Dirty stifled situation is more serious.Using the dirty stifled detector unit described in Fig. 2 and Fig. 3, by infrarede emitting diode and infrared electro
Triode, has played the effect of visible ray in certain filtering environmental, but not filtering environmental mid-infrared light.Additionally, visible ray
It is not reaching to very filter, because because the continuity of the wavelength of light is it is seen that light also can produce shadow to infrared electro triode
Ring.If carrying out housing packaging to transmitting receiving unit and detector unit again, an aperture is only stayed to carry out light leak with light although energy
The impact of more filtering environmental light, but can not filtering environmental light causes to testing result completely impact.And pass through
The dirty stifled detecting system of dirt filtrating screen of the present embodiment can complete the impact to testing result for the filtering environmental light, obtain and accurately filter dirt
Net dirty stifled detection data.
Also control module is included, described control module is used for controlling the first acquisition module repeatedly to obtain first in embodiment 1
Dirty stifled value and control second acquisition module repeatedly obtain the second dirty stifled value, and the multiple described difference that computing module is calculated
Take the 3rd dirty stifled value of average generation dirt filtrating screen, so that the dirty stifled Value Data that detection obtains is more accurate.
In other embodiments, described first acquisition module is used for the dirty stifled of the lower dirt filtrating screen of multiple acquisition ambient light irradiation
Value, and the dirty stifled value of average generation first is taken to multiple described dirty stifled values；Described second acquisition module is used for multiple acquisition ambient light
With the dirty stifled value of dirt filtrating screen under detection light common irradiation, and the dirty stifled value of average generation second is taken to multiple described dirty stifled values.Using
This approach reduces the number of times of embodiment 1 breaker in middle infrarede emitting diode and the damage probability of infrarede emitting diode, with
When reduce the energy consumption of dirty stifled detector unit, detection time is short, and detection efficiency is high.In another embodiment, described first acquisition
Module is used for the multiple dirty stifled value obtaining dirt filtrating screen under ambient light is irradiated, and removes maximum and minimum to multiple described dirty stifled values
The dirty stifled value of average generation first is taken after value；Described second acquisition module is used for multiple acquisition under ambient light and detection light common irradiation
The dirty stifled value of dirt filtrating screen, and multiple described dirty stifled values are removed after maximum and minimum of a value, take the dirty stifled value of average generation second.Adopt
Be in this way based on a certain sampling instances by the reasons such as electromagnetic interference may make sampled magnitude of voltage suddenly become big or
Diminish, this value seriously loses contact with reality value, and with having a long way to go of other normal values, during averaged, this value is seriously dragged down or lifts
High mean value, so that testing result is inaccurate.Arranged most possibly by removing the maximum in multiple repairing weld and minimum of a value
Except this interference problem, make testing result more accurate.
As shown in figure 4, being a kind of schematic flow sheet of the dirty stifled detection method of dirt filtrating screen of filtering environmental light of embodiment 3, side
Method comprises the following steps：
Step 1, obtains the first dirty stifled value that ambient light irradiates lower dirt filtrating screen；
Step 2, obtains the second dirty stifled value of dirt filtrating screen under ambient light and detection light common irradiation；
Step 3, calculates the difference of the described second dirty stifled value and the first dirty stifled value, generates the 3rd dirty stifled value of dirt filtrating screen.
The dirty stifled detection method of dirt filtrating screen of the present embodiment also includes step 4, the specially process of repeat step 1～step 3,
And the multiple described difference calculating is taken with the 3rd dirty stifled value of average generation dirt filtrating screen, can make in this way to detect
The dirty stifled Value Data arriving is more accurate.
In other embodiments, described step 1 is specially：Repeatedly obtain the dirty stifled value that ambient light irradiates lower dirt filtrating screen, and
The dirty stifled value of average generation first is taken to multiple described dirty stifled values；Described step 2 is specially：Repeatedly obtain ambient light and detection light is common
With the dirty stifled value irradiating lower dirt filtrating screen, and the dirty stifled value of average generation second is taken to multiple described dirty stifled values.In this way, often
Decrease in secondary detection and frequently switch on Optical Transmit Unit number of times, reduce the damage probability of Optical Transmit Unit.And light transmitting is single
Unit is maximum in the moment power consumption turning on and off, and reduces the energy consumption that on-off times greatly reduce dirty stifled detector unit.With
When, eliminate and frequently switch on the time that Optical Transmit Unit consumed so that one-time detection required time is shorter, in hgher efficiency.
In another embodiment, described step 1 is specially：Repeatedly obtain the dirty stifled value that ambient light irradiates lower dirt filtrating screen, and
Multiple described dirty stifled values are removed and after maximum and minimum of a value, takes the dirty stifled value of average generation first；Described step 2 is specially：Repeatedly
Obtain the dirty stifled value of dirt filtrating screen under ambient light and detection light common irradiation, and maximum and minimum are removed to multiple described dirty stifled values
The dirty stifled value of average generation second is taken after value.It is because the reasons such as electromagnetic interference may in this way based on a certain sampling instances
Sampled magnitude of voltage is made suddenly to become big or diminish, this value seriously loses contact with reality value, with having a long way to go of other normal values, asks for
During mean value, this value is seriously dragged down or is raised mean value, so that testing result is inaccurate.By removing in multiple repairing weld
Maximum and minimum of a value eliminate this interference problem most possibly, make testing result more accurate.
In the present embodiment, described step 1 is specially：First switch control circuit is controlled to close Optical Transmit Unit；Control and turn
Change the first analog voltage signal that circuit gathers resistance R4 two ends, and transmit to the simulation input port of single-chip microcomputer；Single-chip microcomputer shows
Show the first digital voltage value that described first analog voltage signal is converted into, described first digital voltage value represents the of dirt filtrating screen
One dirty stifled value.Described step 2 is specially：First switch control circuit is controlled to open Optical Transmit Unit；Control change-over circuit collection
Second analog voltage signal at resistance R4 two ends, and transmit to the simulation input port of single-chip microcomputer；Single-chip microcomputer shows described second
The second digital voltage value that analog voltage signal is converted into, described second digital voltage value represents the second dirty stifled value of dirt filtrating screen.
Described second dirty stifled value is deducted the first dirty stifled value, you can be adequately filtered out the impact to testing result for the ambient light, improve detection
The accuracy of result.
Below by way of specific embodiment, said process is illustrated.In the present embodiment, the dirty stifled detection of the dust filtration net
Method is used for detecting the 3rd dirty stifled value of dirt filtrating screen in air-conditioning.Before air-conditioning dispatches from the factory, adopt precision equipment in laboratory, strictly shield
Using this dirty stifled detector unit, dirt filtrating screen is detected under the conditions of covering ambient light interference, set single-chip microcomputer embed AD converter as
Eight precision.Recording brand-new dirt filtrating screen corresponding voltage value is Va (such as 4.72V), is worth for Da (such as 240) after AD conversion.Record
One ordinary family user use the magnitude of voltage of 1 year unwashed dirt filtrating screen (dust stratification is very serious) be Vb (for example
0.69v), corresponding A D value is DB (such as 35).Stifled degree dirty to dirt filtrating screen divides accordingly, and a concrete example that divides is：
It is divided into five grades, each grade classification is described in table 1 below：
The dirty stifled degree of table 1 dirt filtrating screen divides table
By this table data write in air-conditioning program, for representing stifled degree detecting dirty to dirt filtrating screen during operation of air conditioner
Result judged.
The following is under conditions of normal weather interior curtain is closed, the long-pending dirty stifled value of dirt filtrating screen having certain dust of detection
Step：
(1) open single-chip microcomputer internal A/D converter, only record the dirty stifled value of dirt filtrating screen under ambient light, duplicate detection n time
Average.In the present embodiment, n span is advisable in 4-10, too big impact detection speed, too little impact data accuracy,
In this example, n takes 5.
The AD value that for example 5 times sample is respectively：7th, 6,8,7,8, then take first dirty stifled to be worth for mean value 7.
(2) I/O port controls triode to open infrarede emitting diode, and record is under ambient light with detection light comprehensive function
The dirty stifled value of dirt filtrating screen, same detection is averaged for 5 times, and the AD value that 5 times sample is respectively：114th, 116,114,113,115, then
Second is taken dirty stifled to be worth for mean value 114.
(3) stifled value dirty to second and the first dirty stifled value do difference, obtain the 3rd and dirty stifled are worth for 107.
(4) passing through tables look-up judges that dirt filtrating screen is dirty stifled for moderate, or this numerical value is used for other functions.
Under conditions of same, after drawing the curtain apart, indoor environment light changes, and equally adopts said method and step,
Sample data is：
(1), in step 1, the AD value that five times sample is respectively：129th, 128,129,132,130, then take the first dirty stifled value
For mean value 129.
(2), in step 2, the AD value that five times sample is respectively：24th, 23,23,21,21, then take second dirty stifled to be worth for average
Value 22.
(3) stifled value dirty to second and the first dirty stifled value do difference, obtain the 3rd and dirty stifled are worth for 107.
(4) passing through tables look-up judges that dirt filtrating screen is dirty stifled for moderate, or this numerical value is used for other functions.
By detection twice it can be seen that after ambient light changes testing result uninfluenced.But if being provided without
The detection method of above-mentioned filtering environmental light, should be 114 in the testing result data closing curtain condition example shown below, is judged to that moderate is dirty
Stifled：Under the conditions of windowing curtain, the testing result data of example is 129, is judged to slightly dirty stifled, same dirty stifled degree but detects
Different result.The superiority of this method as can be seen here.
The dirty stifled detection method of dirt filtrating screen of the present invention and system, can filter detection process ambient light completely to detection knot
The impact of fruit, not only detection method is simple, and testing result accurately, and can directly obtain the dirty stifled value of dirt filtrating screen, thus to filter
The dirty stifled degree of dirt net is judged, and according to judged result, household electrical appliance can be controlled accordingly, enriches household electrical appliance
Function, improve users' satisfaction degree.
Fig. 5 is a kind of structural representation of air-conditioning of embodiment 4, and the dirt filtrating screen including above-described filtering environmental light is dirty stifled
Detecting system.In other embodiments, the dirty stifled detecting system of dirt filtrating screen can also be applied at other according to the family expenses having dirt filtrating screen
In electrical equipment, such as air cleaner etc..
In describing the invention it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as indicating or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can be expressed or implicitly include at least one this feature.In describing the invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combine.
Although embodiments of the invention have been shown and described above it is to be understood that above-described embodiment is example
Property it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (13)
1. a kind of dirty stifled detecting system of the dirt filtrating screen of filtering environmental light is it is characterised in that include the first acquisition module, the second acquisition
Module and computing module,
Described first acquisition module is used for obtaining the first dirty stifled value that ambient light irradiates lower dirt filtrating screen；
Described second acquisition module is used for obtaining the second dirty stifled value of dirt filtrating screen under ambient light and detection light common irradiation；
Described computing module is used for calculating the described second dirty stifled value and the difference of the first dirty stifled value, and generate dirt filtrating screen the 3rd is dirty stifled
Value.
2. the dirty stifled detecting system of the dirt filtrating screen of filtering environmental light according to claim 1 is it is characterised in that also include controlling
Module, described control module is used for controlling the first acquisition module repeatedly to obtain the first dirty stifled value and control the second acquisition module many
Secondary acquisition the second dirty stifled value, and the multiple described difference that computing module is calculated takes the 3rd dirty stifled of average generation dirt filtrating screen
Value.
3. the dirty stifled detecting system of the dirt filtrating screen of filtering environmental light according to claim 1 is it is characterised in that described first obtains
Delivery block is used for the multiple dirty stifled value obtaining dirt filtrating screen under ambient light is irradiated, and takes average to multiple described dirty stifled values or remove
The dirty stifled value of average generation first is taken after maximum and minimum of a value.
4. the dirty stifled detecting system of the dirt filtrating screen of filtering environmental light according to claim 3 is it is characterised in that described second obtains
Delivery block is used for the multiple dirty stifled value obtaining dirt filtrating screen under ambient light and detection light common irradiation, and multiple described dirty stifled values are taken
Average or take the dirty stifled value of average generation second after removing maximum and minimum of a value.
5. the dirty stifled detecting system of dirt filtrating screen according to the arbitrary described filtering environmental light of Claims 1 to 4 is it is characterised in that institute
State the first acquisition module and the second acquisition module all includes dirty stifled detector unit, described dirty stifled detector unit is included by connector
The transmitting receiving unit connecting and detector unit, and the power supply unit connecting with described detector unit；Described detector unit bag
Include the Optical Transmit Unit for launching detection light to dirt filtrating screen and for receiving through the transmitted light of dirt filtrating screen or through filtering dirt
Net the light-sensitive element of irreflexive reflected light, described transmitting receiving unit includes single-chip microcomputer, first switch control circuit and conversion
Circuit, Optical Transmit Unit connects the first output end of single-chip microcomputer through first switch control circuit, and the converted circuit of light-sensitive element is even
Connect the simulation input port of single-chip microcomputer；Change-over circuit includes the resistance R4 connecting with described light-sensitive element, resistance R4 and described light
The series connection end of quick element is simultaneously connected with the simulation input port of described single-chip microcomputer.
6. a kind of dirty stifled detection method of the dirt filtrating screen of filtering environmental light is it is characterised in that arbitrary described using claim 1～5
Filtering environmental light the dirty stifled detecting system of dirt filtrating screen, method comprises the following steps：
Step 1, obtains the first dirty stifled value that ambient light irradiates lower dirt filtrating screen；
Step 2, obtains the second dirty stifled value of dirt filtrating screen under ambient light and detection light common irradiation；
Step 3, calculates the difference of the described second dirty stifled value and the first dirty stifled value, generates the 3rd dirty stifled value of dirt filtrating screen.
7. the dirty stifled detection method of the dirt filtrating screen of filtering environmental light according to claim 6 is it is characterised in that also include step
4, specially：The process of repeat step 1～step 3, and the multiple described difference calculating is taken with the of average generation dirt filtrating screen
Three dirty stifled values.
8. the dirty stifled detection method of the dirt filtrating screen of filtering environmental light according to claim 6 is it is characterised in that in step 1, many
The secondary dirty stifled value obtaining dirt filtrating screen under ambient light is irradiated, and average is taken to multiple dirty stifled values or removes after maximum and minimum of a value
Take the dirty stifled value of average generation first.
9. the dirty stifled detection method of the dirt filtrating screen of filtering environmental light according to claim 8 is it is characterised in that in step 2, many
The secondary dirty stifled value obtaining dirt filtrating screen under ambient light and detection light common irradiation, and multiple dirty stifled values are taken by average or remove maximum
The dirty stifled value of average generation second is taken after value and minimum of a value.
10. the dirty stifled detection method of dirt filtrating screen according to the arbitrary described filtering environmental light of claim 6～9 is it is characterised in that walk
Rapid 1 is specially：
First switch control circuit is controlled to close Optical Transmit Unit；
Control change-over circuit to gather first analog voltage signal at resistance R4 two ends, and transmit to the analog input end of single-chip microcomputer
Mouthful；
Single-chip microcomputer shows the first digital voltage value that described first analog voltage signal is converted into, described first digital voltage value table
Show the first dirty stifled value of dirt filtrating screen.
The dirty stifled detection method of dirt filtrating screen of 11. filtering environmental light according to claim 10 is it is characterised in that step 2 has
Body is：
First switch control circuit is controlled to open Optical Transmit Unit；
Control change-over circuit to gather second analog voltage signal at resistance R4 two ends, and transmit to the analog input end of single-chip microcomputer
Mouthful；
Single-chip microcomputer shows the second digital voltage value that described second analog voltage signal is converted into, described second digital voltage value table
Show the second dirty stifled value of dirt filtrating screen.
A kind of 12. household electrical appliance are it is characterised in that the dirt filtrating screen including the arbitrary described filtering environmental light of Claims 1 to 5 is dirty
Stifled detecting system.
13. household electrical appliance according to claim 12 are it is characterised in that described household electrical appliance are including empty tempered air
Filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610796353.6A CN106442252A (en) | 2016-08-31 | 2016-08-31 | Method and system for detecting filth blockage in dust filtration mesh for filtering ambient light and household appliances |
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| CN201610796353.6A CN106442252A (en) | 2016-08-31 | 2016-08-31 | Method and system for detecting filth blockage in dust filtration mesh for filtering ambient light and household appliances |
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