CN104237327B - In-car air quality checkout gear and detection method - Google Patents

In-car air quality checkout gear and detection method Download PDF

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CN104237327B
CN104237327B CN201410384662.3A CN201410384662A CN104237327B CN 104237327 B CN104237327 B CN 104237327B CN 201410384662 A CN201410384662 A CN 201410384662A CN 104237327 B CN104237327 B CN 104237327B
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controller
snr
air quality
gas
checkout gear
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富军
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Abstract

The invention discloses a kind of in-car air quality checkout gear and detection method, each gas sensitization film of the present invention is the concentration of the interior various pernicious gases of inspection vehicle respectively, and controller calculates each response signal I (t)1，I(t)2，…，I(t)mMean value, thereby obtain detection signal I (t), utilize detection signal to carry out a series of data processing, thereby obtain the SNR corresponding with I (t); As SNR > SNRWTime, controller is made air quality judgement not up to standard, and controller shows the information that air quality is not up to standard in display, and alarm sends warning message. The present invention both had can carry out overall assessment to the air quality in car, also can carry out concentration monitor to various pernicious gases; Can send in time warning message, be people's the healthy feature providing powerful support for that provides.

Description

In-car air quality checkout gear and detection method
Technical field
The present invention relates to automobile technical field, especially relating to one can be fast, accurately, air matter in automatic detection vehicleMeasure, and in-car air quality is made to in-car air quality checkout gear and the detection method of overall merit.
Background technology
Vehicle air quality condition is very troubling at present, and the existence of pernicious gas has had a strong impact on people in carMember's is healthy; The testing process more complicated of current in-car air quality checkout gear, needs manual operations, nothing mostlyMethod detects automatically. And common checkout gear can only detect the single gas situation that exceeds standard, cannot be to overall empty in carMakings amount is made overall merit.
Chinese patent mandate publication number: CN203443895U, authorizes open day on February 19th, 2014, discloses a kind of chamberInterior air quality detector, it comprises casing, detector body, and detector body is arranged on box house, and described detector is originallyOn body, be provided with gauge tap, time controller, air pump, described gauge tap connect hours controller, time controller connectsThe air pump that several are arranged in parallel, and on each air pump, series connection is provided with individual event gas sense switch, individual event gas detects indicator lamp,Described air pump is connected with spectrophotometric display screen, and spectrophotometric display screen connects mini-printer. The weak point of this invention is,Function singleness, complicated operation, cannot detect in-car air quality automatically.
Summary of the invention
Goal of the invention of the present invention is the testing process more complicated in order to overcome checkout gear of the prior art, needsManual operations, the deficiency that cannot automatically detect, provide one can be fast, accurately, air quality in automatic detection vehicle, andIn-car air quality is made to in-car air quality checkout gear and the detection method of overall merit.
To achieve these goals, the present invention is by the following technical solutions:
A kind of in-car air quality checkout gear, comprises controller, memory, detection dress on the instrument desk of being located at automobilePut, alarm, display and gauge tap; Described checkout gear comprises housing, is located at the cylindrical shell of the lower ending opening on housing top,Cylindrical shell be located in housing for driving the motor that cylindrical shell horizontally rotates to be connected, in described cylindrical shell, be provided with air inlet pipe and with enterThe blast pipe that tracheae is connected, lower housing portion is provided with exhaust outlet, and exhaust outlet is provided with the first magnetic valve, and air inlet pipe is provided with air pumpWith the second magnetic valve, air inlet pipe is stretched out outside cylindrical shell, and blast pipe is provided with the venthole of several arrangements;
In housing, be provided with pressurized tank, operational amplifier and data collecting card that clean air is housed, the shell of blast pipe belowIn body, be provided with m the gas sensitization film for detection of gas with various; Pressurized tank is connected with air inlet pipe by scavenge pipe, scavenge pipeBe provided with the 3rd magnetic valve, each gas sensitization film is electrically connected with the input of operational amplifier respectively, operational amplifier defeatedGo out end be electrically connected with data collecting card, controller respectively with the first magnetic valve, the second magnetic valve, the 3rd magnetic valve, motor, dataCapture card, alarm, memory, display, air pump and gauge tap electrical connection.
Clean air in pressurized tank of the present invention is used for each gas sensitization film to clean, thereby makes each gasSensitive membrane remains reliable susceptibility; Each gas sensitization film is respectively used to the concentration of various pernicious gases in inspection vehicle;The present invention calculates each response signal I (t)1，I(t)2，...，I(t)mMean value, thereby obtain detection signal I (t), utilizeDetection signal carries out a series of data processing, thereby obtains the SNR corresponding with I (t); As SNR > SNRWTime, controllerMake air quality judgement not up to standard, controller shows the information that air quality is not up to standard in display, and alarm sendsWarning message.
When gauge tap is opened, first controller is controlled gas sensitization film is cleaned, thereby ensures to detect dataAccuracy, then automatically control air in car detected, and the detection signal I (t) obtaining is carried out to data place automaticallyReason, not up to standard when air quality, controller shows the information that air quality is not up to standard in display, alarm sends alarm signalBreath.
Obtain after in-car air quality information not up to standard, the personnel that the personnel that riding maybe will ride can openVehicle window is exitted or is adopted other device ventilation; Thereby effectively avoid the injury of pernicious gas to human body.
Therefore, the present invention has simple to operate, and testing process, data processing and the deterministic process that exceeds standard are automatically carries out;Can carry out overall assessment and send in time warning message the air quality in car, for the healthy of people provides strongThe feature of holding.
As preferably, transverse tube and vertical tube that described air inlet pipe comprises ring pipe, is connected with ring pipe; Blast pipe is ringShape, air inlet pipe is positioned at blast pipe top, and air inlet pipe is connected with blast pipe by vertical tube, and transverse tube stretches out outside cylindrical shell, and each goes outAt exhaust pipe lower part circumferentially, the aperture of the steam vent of close vertical tube is less than the aperture away from the steam vent of vertical tube to pore.
As preferably, the cylindrical shell between air inlet pipe and blast pipe is provided with circular baffle plate, and baffle edge embeds is located at cylindrical shellIn the annular groove of inwall, chute downside is provided with leakage-proof ring, and vertical tube is through baffle plate.
As preferably, described m is that 10,10 gas sensitization films are respectively for detection of sulfide, hydrogen, alcohol, toluene, twoThe gas sensitization film of toluene, carbon monoxide, carbon dioxide, methane, propane and nitrogen oxide.
As preferably, described gas sensitization film is the cylindric of both ends open, in the cavity of gas sensitization film, is provided with heatingResistance wire, resistive heater two ends are electrically connected with power supply by heating pin respectively, and gas sensitization film is provided with two detections and drawsPin and two fixing pins, two are detected pin and are electrically connected with in-phase input end and the inverting input of operational amplifier respectively.
The resistive heater arranging in the cavity of gas sensitization film is for heating to gas sensitization film. Gas of the present invention is quickSense film structure contribute to improve gas accuracy of detection, in working order under, gas sensitization film by Resistant heating to 300～480 DEG C, in the time that tested gas is carried into sensor sensing film surface, gas molecule is oxidized under the effect of high temperature, oxidationProduct is attached to gas sensitization film surface, causes the variation of gas sensitization film resistance, can be real according to the variation of this resistance valueThe sign of existing gas concentration. Gas with various sensitive membrane of the present invention adopts different materials preparation, and every kind of gas sensitization film is only to spyDetermine gas sensitization, gas sensitization film has specificity.
As preferably, operational amplifier is UPC4570 low noise computing paster amplifier, data collecting card be based onThe low-power-consumption embedded data collecting card of MSP430F5438, controller is the low-power-consumption embedded MCU of MSP430F149.
A detection method for in-car air quality checkout gear, comprises the steps:
(7-1) in controller, be preset with air quality threshold value SNRW, in memory, be provided with one deck accidental resonance model:
Wherein, V (x, t) is potential function, and x (t) is Brownian movement Particles Moving lopcus function, a, and b is the constant of setting, ξ(t) be external noise, D is external noise intensity, and N (t) grasps noise in being,For periodicity sinusoidal signal, A is letterNumber amplitude, f is signal frequency, t is run duration,For phase place,
(7-2) gas sensitization film is cleaned:
When gauge tap is opened, controller control first, the 3rd magnetic valve are opened with clean air in housingGas sensitization film cleans; Clean air under pressure, is entered in housing by air inlet pipe and blast pipe, is arranged by exhaust outletGo out outside housing;
(7-3) Detection of Air Quality:
After cleaning, controller control first, the 3rd closed electromagnetic valve, the second magnetic valve is opened; And control motor andAir pump work, driven by motor cylindrical shell horizontally rotates, and the gas in compartment enters in air inlet pipe and detects, controller control after detectionMake the second closed electromagnetic valve;
In testing process, gas contacts with each gas sensitization film, and each gas sensitization film produces respectively response signalI(t)1，I(t)2，...，I(t)m, controller calculates the average signal of each response signal, and average signal is defined as and detects letterNumber I (t);
(7-4) data processing:
(7-4-1) controller is by detection signal I (t) input one deck accidental resonance model, and it is right that controller calculates V (x, t)In first derivative and the second dervative of x (t), and make equation equal 0, obtain two layers of accidental resonance model:
Set noiseIntensity D=0,I (t)=0, N (t)=0; The critical value that calculates A is
(7-4-2) by critical value substitution one deck accidental resonance model of A, and set X0(t)＝0，sn0=0, with quadravalence jade for asking rain lattice storehouseTower Algorithm for Solving one deck accidental resonance model, obtains x n + 1 ( t ) = x n ( t ) + 1 / 6 [ ( k 1 ) n + ( 2 - 2 ) ( k 2 ) n + ( 2 + 2 ) ( k 3 ) n + ( k 4 ) n ] ; And calculate ( k 1 ) n = 4 ( ax n - 1 ( t ) - bx n - 1 3 ( t ) + sn n - 1 ) , ( k 2 ) n = 4 [ a ( x n - 1 ( t ) + ( k 1 ) n - 1 2 ) - b ( x n - 1 ( t ) + ( k 1 ) n - 1 2 ) 3 + sn n - 1 ] , ( k 3 ) n = 4 [ a ( x n - 1 ( t ) + ( k 2 ) n - 1 2 ) - b ( x n - 1 ( t ) + 2 - 1 2 ( k 1 ) n - 1 + 2 - 2 2 ( k 2 ) n - 1 ) 3 + sn n + 1 ] , ( k 4 ) n = 4 [ a ( x n - 1 ( t ) + ( k 3 ) n - 1 ) - b ( x n - 1 ( t ) - 2 2 ( k 2 ) n - 1 + 2 + 2 2 ( k 3 ) n - 1 ) 3 + sn n + 1 ] ;
Wherein, xn(t) be the n order derivative of x (t), snn-1That the n-1 order derivative of S (t) is at the value at t=0 place, snn+1S(t) n+1 order derivative is in the value at t=0 place, n=0, and 1 ..., N-1; Obtain x1(t)，x2(t)，...，xn+1(t) value;
(7-4-3) controller is to x1(t)，x2(t)，...，xn+1(t) carry out integration, obtain definite x (t), and obtain x(t) produce the position in accidental resonance moment in the double-deck stochastic system of one deck accidental resonance model and two layers of accidental resonance model compositionPut xmValue and xmCorresponding resonance moment t1And and t1Corresponding noise D1，D1For a value in D;
(7-4-4) controller utilizes formulaCalculate double-deck stochastic resonance system defeatedThe signal to noise ratio going out; Wherein, Δ U=a2/ 4b; Obtain output signal-to-noise ratio SNR;
(7-5) make comprehensive judgement:
If SNR > is SNRW, controller is made air quality judgement not up to standard, and controller shows air in displayThe information of quality dissatisfaction, alarm sends warning message;
If SNR≤SNRW, controller is made air quality judgement up to standard, and controller shows air matter in displayMeasure information up to standard, controller control gauge tap cuts out.
As preferably, also comprise the steps:
(8-1) in controller, be preset with the gaseous mass threshold value SNR corresponding with each gas sensitization filmp1，SNRp2，...，SNRpm; Controller is by I (t)1，I(t)2，...，I(t)mIn input step (7-4), obtain m output letter successivelyMake an uproar and compare SNR1，SNR2，...，SNRm；
If (8-2) SNRi＞SNRpi, i=1 ..., m; I is the sequence number of gas sensitization film, and controller is made i gasThe judgement that the corresponding gas of body sensitive membrane exceeds standard, controller demonstrates the information that this kind of gas exceeds standard in display, reports to the policeDevice sends warning message.
As preferably, the lasting time of cleaning course is 30 seconds to 2 minutes; The lasting time of testing process is 30 to 120Second.
As preferably, in car, gas is by the speed suction casing of 360mL/min to 570mL/min.
Therefore, the present invention has following beneficial effect:
(1) simple to operate, testing process, data processing and the deterministic process that exceeds standard are automatically carries out; ;
(2) both can carry out overall assessment to the air quality in car, also can carry out concentration prison to various pernicious gasesSurvey;
(3) can send in time warning message, for people's healthy providing provides powerful support for and can detect.
Brief description of the drawings
Fig. 1 is a kind of theory diagram of the present invention;
Fig. 2 is a kind of structure chart of the present invention;
Fig. 3 is a kind of structure chart of air inlet pipe of the present invention and blast pipe;
Fig. 4 is a kind of structural representation of gas sensitization film of the present invention;
Fig. 5 is a kind of flow chart of embodiments of the invention.
In figure: controller 1, memory 2, alarm 3, display 4, gauge tap 5, housing 6, cylindrical shell 7, motor 8, air inletPipe 9, blast pipe 10, exhaust outlet 11, the first magnetic valve 12, air pump 13, the second magnetic valve 14, operational amplifier 15, data acquisitionCard 16, gas sensitization film 17, the 3rd magnetic valve 18, transverse tube 19, vertical tube 20, crossbeam 21, insulating circuit board 22, cross 23, addHot pin 24, detection pin 25, fixing pin 26.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment 1
Embodiment is as shown in Figure 1 and Figure 2 a kind of in-car air quality checkout gear, comprises the instrument desk of being located at automobileOn controller 1, memory 2, checkout gear, alarm 3, display 4 and gauge tap 5; Checkout gear comprises housing 6, establishesIn the cylindrical shell 7 of the lower ending opening on housing top, as shown in Figure 3, the exhaust that is provided with air inlet pipe 9 in cylindrical shell and is connected with air inlet pipePipe 10, blast pipe is provided with cross 23, and housing is provided with crossbeam 21, and crossbeam is provided with motor 8, and cross is by column and electricityThe rotating shaft of machine is connected, and lower housing portion is provided with exhaust outlet 11, and exhaust outlet is provided with the first magnetic valve 12, and air inlet pipe is provided with air pump13 and second magnetic valve 14, air inlet pipe is stretched out outside cylindrical shell, and blast pipe is provided with the venthole of arrangement;
In housing, be provided with pressurized tank, operational amplifier 15 and data collecting card 16 that clean air is housed, blast pipe belowHousing in be provided with insulating circuit board 22, as shown in Figure 4, insulating circuit board is provided with 10 gases for detection of gas with variousSensitive membrane 17; Pressurized tank is connected with air inlet pipe by scavenge pipe, and scavenge pipe is provided with the 3rd magnetic valve 18, each gas sensitizationFilm is electrically connected with the input of operational amplifier respectively, and as shown in Figure 1, output and the data collecting card of operational amplifier are electrically connectedConnect, controller respectively with the first magnetic valve, the second magnetic valve, the 3rd magnetic valve, motor, data collecting card, alarm, storageDevice, display, air pump and gauge tap electrical connection.
As shown in Figure 3, air inlet pipe comprises ring pipe, is connected with ring pipe transverse tube 19 and vertical tube 20; Blast pipe is ringShape, air inlet pipe is positioned at blast pipe top, and air inlet pipe is connected with blast pipe by vertical tube, and transverse tube stretches out outside cylindrical shell, and each goes outAt exhaust pipe lower part circumferentially, the aperture of the steam vent of close vertical tube is less than the aperture away from the steam vent of vertical tube to pore.
Cylindrical shell between air inlet pipe and blast pipe is provided with circular baffle plate, and baffle edge embeds the annular of being located at cylinder inboard wallIn chute, chute downside is provided with leakage-proof ring, and vertical tube is through baffle plate.
10 gas sensitization films are respectively for detection of sulfide, hydrogen, alcohol, toluene, dimethylbenzene, carbon monoxide, dioxyChange the gas sensitization film of carbon, methane, propane and nitrogen oxide.
As shown in Figure 4, gas sensitization film is the cylindric of both ends open, in the cavity of gas sensitization film, is provided with heating resistorSilk, resistive heater two ends are electrically connected with power supply by heating pin 24 respectively, and gas sensitization film is provided with two and detects pin25 is defeated with the homophase of operational amplifier respectively with 26, two detection pins of two fixing pins that are connected with insulating circuit board 22Enter end and inverting input electrical connection.
Operational amplifier is UPC4570 low noise computing paster amplifier, and data collecting card is low based on MSP430F5438Power consumption embedded data acquisition card, controller is the low-power-consumption embedded MCU of MSP430F149. The pressure of clean air in pressurized tankBe 3 atmospheric pressure.
SNRWBe by will comprise sulfide, hydrogen, alcohol, toluene, dimethylbenzene, carbon monoxide, carbon dioxide, methane,Any concentration in propane and nitrogen oxide air that just exceeded standard utilizes method of the present invention to detect, and to comprising itIn the air of the gas that just exceeded standard of any number of concentration detect, the snr value that detection is obtained is averaging and obtainsSNRW。
As shown in Figure 5, a kind of detection method of in-car air quality checkout gear, comprises the steps:
In controller, be preset with air quality threshold value SNRW, in memory, be provided with one deck accidental resonance model:
Wherein, V (x, t) is potential function, and x (t) is Brownian movement Particles Moving lopcus function, a, and b is the constant of setting, ξ(t) be external noise, D is external noise intensity, and N (t) grasps noise in being,For periodicity sinusoidal signal, A is letterNumber amplitude, f is signal frequency, t is run duration,For phase place,
Step 100, gas sensitization film is cleaned:
When gauge tap is opened, controller control first, the 3rd magnetic valve are opened, with clean air in housingGas sensitization film cleans 50 seconds; Clean air under pressure, is entered in housing by air inlet pipe and blast pipe, is arranged by exhaust outletGo out outside housing;
Step 200, Detection of Air Quality:
After cleaning, controller control first, the 3rd closed electromagnetic valve, the second magnetic valve is opened; And control motor andAir pump work, driven by motor cylindrical shell horizontally rotates, and the gas in compartment enters in air inlet pipe and detects 1 with the speed of 400mL/minMinute, controller control the second closed electromagnetic valve after detection;
In testing process, gas contacts with each gas sensitization film, and each gas sensitization film produces respectively response signalI(t)1，I(t)2，...，I(t)m, controller calculates the average signal of each response signal, and average signal is defined as and detects letterNumber I (t);
Step 300, data processing:
Step 310, controller is by detection signal I (t) input one deck accidental resonance model, and it is right that controller calculates V (x, t)In first derivative and the second dervative of x (t), and make equation equal 0, obtain two layers of accidental resonance model:
Set noiseIntensity D=0,I (t)=0, N (t)=0; The critical value that calculates A is
Step 320, by critical value substitution one deck accidental resonance model of A, and sets X0(t)＝0，sn0=0, use quadravalenceJade for asking rain Ge Kuta Algorithm for Solving one deck accidental resonance model, obtains x n + 1 ( t ) = x n ( t ) + 1 / 6 [ ( k 1 ) n + ( 2 - 2 ) ( k 2 ) n + ( 2 + 2 ) ( k 3 ) n + ( k 4 ) n ] ; And calculate ( k 1 ) n = 4 ( ax n - 1 ( t ) - bx n - 1 3 ( t ) + sn n - 1 ) , ( k 2 ) n = 4 [ a ( x n - 1 ( t ) + ( k 1 ) n - 1 2 ) - b ( x n - 1 ( t ) + ( k 1 ) n - 1 2 ) 3 + sn n - 1 ] , ( k 3 ) n = 4 [ a ( x n - 1 ( t ) + ( k 2 ) n - 1 2 ) - b ( x n - 1 ( t ) + 2 - 1 2 ( k 1 ) n - 1 + 2 - 2 2 ( k 2 ) n - 1 ) 3 + sn n + 1 ] , ( k 4 ) n = 4 [ a ( x n - 1 ( t ) + ( k 3 ) n - 1 ) - b ( x n - 1 ( t ) - 2 2 ( k 2 ) n - 1 + 2 + 2 2 ( k 3 ) n - 1 ) 3 + sn n + 1 ] ;
Wherein, xn(t) be the n order derivative of x (t), snn-1That the n-1 order derivative of S (t) is at the value at t=0 place, snn+1S(t) n+1 order derivative is in the value at t=0 place, n=0, and 1 ..., N-1; Obtain x1(t)，x2(t)，...，xn+1(t) value;
Step 330, controller is to x1(t)，x2(t)，...，xn+1(t) carry out integration, obtain definite x (t), and obtain x(t) produce the position in accidental resonance moment in the double-deck stochastic system of one deck accidental resonance model and two layers of accidental resonance model compositionPut xmValue and xmCorresponding resonance moment t1And and t1Corresponding noise D1，D1For a value in D;
Step 340, controller utilizes formulaCalculate double-deck stochastic resonance systemThe signal to noise ratio of output; Wherein, Δ U=a2/ 4b; Obtain output signal-to-noise ratio SNR;
Step 400, make comprehensive judgement:
If SNR > is SNRW, controller is made air quality judgement not up to standard, and controller shows air in displayThe information of quality dissatisfaction, alarm sends warning message;
If SNR≤SNRW, controller is made air quality judgement up to standard, and controller shows air matter in displayMeasure information up to standard, controller control gauge tap cuts out.
Embodiment 2
Also comprise the steps:
In controller, be preset with the gaseous mass threshold value SNR corresponding with each gas sensitization filmp1，SNRp2，...，SNRpm; Controller is by I (t)1，I(t)2，...，I(t)mIn input step (7-4), obtain m output signal-to-noise ratio SNR successively1，SNR2，...，SNRm；
If SNRi＞SNRpi, i=1 ..., m; I is the sequence number of gas sensitization film, and controller is made i gas sensitizationThe judgement that the corresponding gas of film exceeds standard, controller demonstrates the information that this kind of gas exceeds standard in display, and alarm sendsWarning message.
Other structure and step part in embodiment 2 are in the same manner as in Example 1.
SNRp1，SNRp2，...，SNRpmIn any one are all the corresponding gas profits by concentration known has just been exceeded standardWith the numerical value that method of the present invention detects and data processing obtains, and repeatedly detect repeatedly, calculate repeatedly the average of numerical valueValue obtains.
Should be understood that the present embodiment is only not used in and limits the scope of the invention for the present invention is described. In addition should be understood thatAfter having read the content of the present invention's instruction, those skilled in the art can make various changes or modifications the present invention, these etc.Valency form falls within the application's appended claims limited range equally.

Claims (9)

1. an in-car air quality checkout gear, is characterized in that, comprises controller (1) on the instrument desk of being located at automobile, depositsReservoir (2), checkout gear, alarm (3), display (4) and gauge tap (5); Described checkout gear comprises housing (6), establishesIn the cylindrical shell (7) of the lower ending opening on housing top, cylindrical shell be located at the motor (8) for driving cylindrical shell to horizontally rotate in housingBe connected, the blast pipe (10) that is provided with air inlet pipe (9) in described cylindrical shell and is connected with air inlet pipe, lower housing portion is provided with exhaust outlet(11), exhaust outlet is provided with the first magnetic valve (12), and air inlet pipe is provided with air pump (13) and the second magnetic valve (14), and air inlet pipe is stretchedGo out outside cylindrical shell, blast pipe is provided with the venthole of several arrangements;
In housing, be provided with pressurized tank, operational amplifier (15) and data collecting card (16) that clean air is housed, blast pipe belowHousing in be provided with m the gas sensitization film (17) for detection of gas with various; Pressurized tank is connected with air inlet pipe by scavenge pipeLogical, scavenge pipe is provided with the 3rd magnetic valve (18), and each gas sensitization film is electrically connected with the input of operational amplifier respectively, fortuneCalculate the output of amplifier and be electrically connected with data collecting card, controller respectively with the first magnetic valve, the second magnetic valve, the 3rd electromagnetismValve, motor, data collecting card, alarm, memory, display, air pump and gauge tap electrical connection;
Transverse tube (19) and vertical tube (20) that described air inlet pipe comprises ring pipe, is connected with ring pipe; Blast pipe ringwise, air inletPipe is positioned at blast pipe top, and air inlet pipe is connected with blast pipe by vertical tube, and transverse tube stretches out outside cylindrical shell, and each venthole is rowCircumferentially, the aperture of the steam vent of close vertical tube is less than the aperture away from the steam vent of vertical tube in tracheae bottom.
2. in-car air quality checkout gear according to claim 1, is characterized in that, the cylinder between air inlet pipe and blast pipeBody is provided with circular baffle plate, and baffle edge embeds and is located in the annular groove of cylinder inboard wall, and chute downside is provided with leakage-proof ring,Vertical tube is through baffle plate.
3. in-car air quality checkout gear according to claim 1, is characterized in that, described m is 10,10 gas sensitization filmsBe respectively for detection of sulfide, hydrogen, alcohol, toluene, dimethylbenzene, carbon monoxide, carbon dioxide, methane, propane and nitrogen oxygenThe gas sensitization film of compound.
4. in-car air quality checkout gear according to claim 1, is characterized in that, described gas sensitization film is two ends and opensMouthful cylindric, in the cavity of gas sensitization film, be provided with resistive heater, resistive heater two ends respectively by heating pin(24) be electrically connected with power supply, gas sensitization film is provided with two and detects pin (25) and two fixing pins (26), two detectionsPin is electrically connected with in-phase input end and the inverting input of operational amplifier respectively.
5. according to the in-car air quality checkout gear described in claim 1 or 2 or 3 or 4, it is characterized in that, operational amplifier isUPC4570 low noise computing paster amplifier, data collecting card is the low-power-consumption embedded data acquisition based on MSP430F5438Card, controller is the low-power-consumption embedded MCU of MSP430F149.
6. a detection method that is applicable to in-car air quality checkout gear claimed in claim 1, is characterized in that, comprise asLower step:
(6-1) in controller, be preset with air quality threshold value SNRW, in memory, be provided with one deck accidental resonance model:
, wherein, V (x,T) be potential function, x (t) is Brownian movement Particles Moving lopcus function, a, and b is the constant of setting, ξ (t) is external noise, outside D isNoise intensity, N (t) grasps noise in being,For periodicity sinusoidal signal, A is signal amplitude, and f is signal frequencyRate, t is run duration,For phase place;
(6-2) gas sensitization film is cleaned:
When gauge tap is opened, controller control first, the 3rd magnetic valve are opened with clean air the gas in housingSensitive membrane is cleaned; Clean air under pressure, is entered in housing by air inlet pipe and blast pipe, discharges shell by exhaust outletOutside body;
(6-3) Detection of Air Quality:
After cleaning, controller control first, the 3rd closed electromagnetic valve, the second magnetic valve is opened; And control motor and air pumpWork, driven by motor cylindrical shell horizontally rotates, and the gas in compartment enters in air inlet pipe and detects, controller control the after detectionTwo closed electromagnetic valves;
In testing process, gas contacts with each gas sensitization film, and each gas sensitization film produces respectively response signal I(t)1，I(t)2，...，I(t)m, controller calculates the average signal of each response signal, and average signal is defined as to detection signalI(t)；
(6-4) data processing:
(6-4-1) controller is by detection signal I (t) input one deck accidental resonance model, and controller calculates V (x, t) for x(t) first derivative and second dervative, and make equation equal 0, obtain two layers of accidental resonance model:
Set noise intensityD＝0，I (t)=0, N (t)=0; The critical value that calculates A is
(6-4-2) by critical value substitution one deck accidental resonance model of A, and set sn0=0, with quadravalence jade for asking rain latticeStorehouse tower Algorithm for Solving one deck accidental resonance model, obtains x n + 1 ( t ) = x n ( t ) + 1 / 6 [ ( k 1 ) n + ( 2 - 2 ) ( k 2 ) n + ( 2 + 2 ) ( k 3 ) n + ( k 4 ) n ] ; And calculate ( k 1 ) n = 4 ( ax n - 1 ( t ) - bx n - 1 3 ( t ) + sn n - 1 ) ,
( k 2 ) n = 4 [ a ( x n - 1 ( t ) + ( k 1 ) n - 1 2 ) - b ( x n - 1 ( t ) + ( k 1 ) n - 1 2 ) 3 + sn n - 1 ] ,
( k 3 ) n = 4 [ a ( x n - 1 ( t ) + ( k 2 ) n - 1 2 ) - b ( x n - 1 ( t ) + 2 - 1 2 ( k 1 ) n - 1 + 2 - 2 2 ( k 2 ) n - 1 ) 3 + sn n + 1 ] ,
( k 4 ) n = 4 [ a ( x n - 1 ( t ) + ( k 3 ) n - 1 ) - b ( x n - 1 ( t ) - 2 2 ( k 2 ) n - 1 + 2 + 2 2 ( k 3 ) n - 1 ) 3 + sn n + 1 ] ;
Wherein, xn(t) be the n order derivative of x (t),snn-1The n-1 of S (t)Order derivative is at the value at t=0 place, snn+1Be the n+1 order derivative of S (t) in the value at t=0 place, n=0,1 ..., N-1; Obtain x1(t)，x2(t)，…，xn+1(t) value;
(6-4-3) controller is to x1(t)，x2(t)，…，xn+1(t) carry out integration, obtain definite x (t), and obtain x (t) oneThe double-deck stochastic system of layer accidental resonance model and two layers of accidental resonance model composition produces the position x in accidental resonance momentmValue,With xmCorresponding resonance moment t1And and t1Corresponding noise D1，D1For a value in D;
(6-4-4) controller utilizes formulaCalculate double-deck stochastic resonance system outputSignal to noise ratio; Wherein, Δ U=a2/ 4b; Obtain output signal-to-noise ratio SNR;
(6-5) make comprehensive judgement:
If SNR > is SNRW, controller is made air quality judgement not up to standard, and controller shows air quality in displayInformation not up to standard, alarm sends warning message;
If SNR≤SNRW, controller is made air quality judgement up to standard, and controller shows that in display air quality reachesTarget information, controller control gauge tap cuts out.
7. the detection method of in-car air quality checkout gear according to claim 6, is characterized in that, also comprises following stepRapid:
(7-1) in controller, be preset with the gaseous mass threshold value SNR corresponding with each gas sensitization filmp1，SNRp2，...，SNRpm; Controller is by I (t)1，I(t)2，...，I(t)mIn input step (6-4), obtain m output signal-to-noise ratio SNR successively1，SNR2，...，SNRm；
If (7-2) SNRi＞SNRpi, i=1 ..., m; I is the sequence number of gas sensitization film, and it is quick that controller is made i gasThe judgement that the corresponding gas of sense film exceeds standard, controller demonstrates the information that this kind of gas exceeds standard in display, and alarm is sent outGo out warning message.
8. the detection method of in-car air quality checkout gear according to claim 6, is characterized in that, cleaning course continuesTime be 30 seconds to 2 minutes; The lasting time of testing process is 30 to 120 seconds.
9. according to the detection method of the in-car air quality checkout gear described in claim 6 or 7 or 8, it is characterized in that gas in carBody is by the speed suction casing with 360mL/min to 570mL/min.
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