CN104237327A - Device and method for detecting in-vehicle air quality - Google Patents

Device and method for detecting in-vehicle air quality Download PDF

Info

Publication number
CN104237327A
CN104237327A CN201410384662.3A CN201410384662A CN104237327A CN 104237327 A CN104237327 A CN 104237327A CN 201410384662 A CN201410384662 A CN 201410384662A CN 104237327 A CN104237327 A CN 104237327A
Authority
CN
China
Prior art keywords
controller
air quality
gas
snr
sensitization film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410384662.3A
Other languages
Chinese (zh)
Other versions
CN104237327B (en
Inventor
富军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201410384662.3A priority Critical patent/CN104237327B/en
Publication of CN104237327A publication Critical patent/CN104237327A/en
Application granted granted Critical
Publication of CN104237327B publication Critical patent/CN104237327B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a device and a method for detecting the in-vehicle air quality. The method comprises the steps of detecting the concentrations of all harmful gases in a vehicle respectively by all gas sensitive films, and calculating the average value of all response signals such as I (t) 1, I (t) 2,...and I (t) m by a controller to obtain a detection signal I (t); carrying out a series of data processing by the detection signal to obtain signal noise ratio (SNR) corresponding to the I (t); and when the SNR is more than SNRW, judging that the air quality does not reach the standard by the controller, displaying the information that air quality does not reach the standard in a display device by the controller, and enabling an alarm device to send out alarm information. After the device and the method are adopted, the in-vehicle air quality can be comprehensively evaluated, and the concentrations of all the harmful gases can be monitored; the alarm information can be sent out in time, so that a powerful support is provided for health of people.

Description

In-car air quality pick-up unit and detection method
Technical field
The present invention relates to automobile technical field, especially relate to one can fast, accurately, air quality in automatic detection vehicle, and in-car air quality is made to in-car air quality pick-up unit and the detection method of comprehensive evaluation.
Background technology
Current vehicle air quality condition is very troubling, and the existence of harmful gas has had a strong impact on the healthy of occupant; The testing process more complicated of current in-car air quality pick-up unit, needs manual operations mostly, cannot automatically detect.Further, common pick-up unit can only detect single gas and to exceed standard situation, cannot make comprehensive evaluation to overall air quality in car.
Chinese patent mandate publication number: CN203443895U, authorize publication date on February 19th, 2014, disclose a kind of determining instrument of indoor air quality, it comprises casing, detector body, detector body is arranged on box house, described detector body is provided with gauge tap, time controller, air pump, described gauge tap tie-time controller, time controller connects several air pumps be arranged in parallel, and series connection is provided with individual event gas detect switch on each air pump, individual event gas detect pilot lamp, described air pump is connected with spectrophotometric display screen, spectrophotometric display screen connects mini-printer.The weak point of this invention is, function singleness, complicated operation, cannot automatically detect in-car air quality.
Summary of the invention
Goal of the invention of the present invention is the testing process more complicated in order to overcome pick-up unit of the prior art, need manual operations, automatically the deficiency detected cannot be carried out, provide one can fast, accurately, air quality in automatic detection vehicle, and in-car air quality is made to in-car air quality pick-up unit and the detection method of comprehensive evaluation.
To achieve these goals, the present invention is by the following technical solutions:
A kind of in-car air quality pick-up unit, comprises the controller be located on the instrument desk of automobile, storer, pick-up unit, alarm, display and gauge tap; Described pick-up unit comprises housing, is located at the cylindrical shell of the lower ending opening of housing upper, cylindrical shell be located at being connected for the motor driving cylindrical shell to horizontally rotate in housing, the gas outlet being provided with draft tube in described cylindrical shell and being connected with draft tube, lower housing portion is provided with exhausr port, exhausr port is provided with the first solenoid valve, draft tube is provided with air pump and the second solenoid valve, and draft tube is stretched out outside cylindrical shell, and gas outlet is provided with the venthole of several arrangements;
Being provided with head tank, operational amplifier and data collecting card that clean air is housed in housing, being provided with m in the housing below gas outlet for detecting the gas sensitization film of gas with various; Head tank is connected with draft tube by purge pipe, purge pipe is provided with the 3rd solenoid valve, each gas sensitization film is electrically connected with the input end of operational amplifier respectively, the output terminal of operational amplifier is electrically connected with data collecting card, and controller is electrically connected with the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, motor, data collecting card, alarm, storer, display, air pump and gauge tap respectively.
Clean air in head tank of the present invention is used for cleaning each gas sensitization film, thus makes each gas sensitization film remain reliable susceptibility; Each gas sensitization film is respectively used to the concentration of various harmful gas in inspection vehicle; The present invention calculates each response signal I (t) 1, I (t) 2..., I (t) mmean value, thus obtain detection signal I (t), utilize detection signal to carry out a series of data processing, thus obtain the SNR corresponding with I (t); As SNR > SNR wtime, then air quality judgement not up to standard made by controller, and controller shows air quality information not up to standard in the display, and alarm sends warning message.
When gauge tap is opened, first controller controls to clean gas sensitization film, thus ensure the accuracy detecting data, then automatically control to detect air in car, and automatically data processing is carried out to detection signal I (t) obtained, when air quality is not up to standard, controller shows air quality information not up to standard in the display, and alarm sends warning message.
After obtaining in-car air quality information not up to standard, the personnel that the personnel ridden maybe will ride can open vehicle window venting or adopt other device to take a breath; Thus effectively avoid harmful gas to the injury of human body.
Therefore, the present invention has simple to operate, and testing process, data processing and the deterministic process that exceeds standard are carries out automatically; Can overall assessment be carried out to the air quality in car and send warning message in time, for the healthy of people provides the feature provided powerful support for.
As preferably, described draft tube comprises ring pipe, the transverse tube be connected with ring pipe and vertical tube; Gas outlet ringwise, draft tube is positioned at above gas outlet, and draft tube is connected with gas outlet by vertical tube, and transverse tube stretches out outside cylindrical shell, each venthole at exhaust pipe lower part circumferentially, is less than the aperture of the vent port away from vertical tube near the aperture of the vent port of vertical tube.
As preferably, the cylindrical shell between draft tube and gas outlet is provided with circular baffle plate, and baffle edge embeds to be located in the annular groove of cylinder inboard wall, and chute downside is provided with leakage-proof ring, and vertical tube is through baffle plate.
As preferably, described m is the gas sensitization film that 10,10 gas sensitization films are respectively for detecting sulfide, hydrogen, alcohol, toluene, dimethylbenzene, carbon monoxide, carbon dioxide, methane, propane and oxides of nitrogen.
As preferably, described gas sensitization film is the cylindrical shape of both ends open, resistive heater is provided with in the cavity of gas sensitization film, resistive heater two ends are connected with power electric respectively by heating pin, gas sensitization film is provided with two and detects pins and two fixing pins, and two are detected pin and are electrically connected with the in-phase input end of operational amplifier and inverting input respectively.
The resistive heater arranged in the cavity of gas sensitization film is used for heating to gas sensitization film.The structure of gas sensitization film of the present invention contributes to improving gas detect precision, in working order, gas sensitization film is by Resistant heating to 300 ~ 480 DEG C, when tested gas is carried into sensor sensing film surface, gas molecule is oxidized under the effect of high temperature, oxidation product is attached to gas sensitization film surface, and cause the change of gas sensitization film resistance, the change according to this resistance value can realize the sign of gas concentration.Gas with various sensitive membrane of the present invention adopts different materials preparation, and often kind of gas sensitization film is only responsive to specific gas, and namely gas sensitization film has specificity.
As preferably, operational amplifier is UPC4570 low noise computing paster amplifier, and data collecting card is the low-power-consumption embedded data collecting card based on MSP430F5438, and controller is the low-power-consumption embedded MCU of MSP430F149.
A detection method for in-car air quality pick-up unit, comprises the steps:
(7-1) air quality threshold SNR is preset with in controller w, be provided with one deck accidental resonance model in storer:
wherein, V (x, t) is potential function, and x (t) is Brownian movement Particles Moving lopcus function, and a, b are the constant of setting, and ξ (t) is external noise, and D is external noise intensity, and N (t) grasps noise in being, for periodic sinusoidal signal, A is signal amplitude, and f is signal frequency, and t is run duration, for phase place,
(7-2) gas sensitization film is cleaned:
When gauge tap is opened, controller control the first, the 3rd solenoid valve is opened and is cleaned the gas sensitization film in housing with clean air; Clean air under pressure, enters in housing by draft tube and gas outlet, discharges outside housing by exhausr port;
(7-3) Detection of Air Quality:
After cleaning, controller controls the first, the 3rd closed electromagnetic valve, and the second solenoid valve is opened; And controlling motor and air pump work, driven by motor cylindrical shell horizontally rotates, and the gas in compartment enters in draft tube and detects, and after detection, controller controls the second closed electromagnetic valve;
In testing process, gas contacts with each gas sensitization film, and each gas sensitization film produces response signal I (t) respectively 1, I (t) 2..., I (t) m, controller calculates the average signal of each response signal, and average signal is defined as detection signal I (t);
(7-4) data processing:
(7-4-1) detection signal I (t) inputs in one deck accidental resonance model by controller, controller calculates V (x, t) for first order derivative and the second derivative of x (t), and make equation equal 0, obtain two layers of accidental resonance model:
setting noise intensity D=0, i (t)=0, N (t)=0; The critical value calculating A is
(7-4-2) critical value of A is substituted in one deck accidental resonance model, and set X 0(t)=0, sn 0=0, with quadravalence jade for asking rain Ge Kuta Algorithm for Solving one deck accidental resonance model, obtain 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 ( a x n - 1 ( t ) - b x n - 1 3 ( t ) + s n 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 + s n 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 + s n n + 1 ] ;
Wherein, x nt n order derivative that () is x (t), sn n-1the value of n-1 order derivative at t=0 place of S (t), sn n+1the value of n+1 order derivative at t=0 place of S (t), n=0,1 ..., N-1; Obtain x 1(t), x 2(t) ..., x n+1the value of (t);
(7-4-3) controller is to x 1(t), x 2(t) ..., x n+1t () carries out integration, obtain the x (t) determined, and obtains x (t) produces accidental resonance moment position x in the double-deck stochastic system of one deck accidental resonance model and two layers of accidental resonance model composition mvalue and x mcorresponding resonance moment t 1and and t 1corresponding noise D 1, D 1for the value of in D;
(7-4-4) controller utilizes formula calculate the signal to noise ratio (S/N ratio) that double-deck stochastic resonance system exports; Wherein, Δ U=a 2/ 4b; Obtain output signal-to-noise ratio SNR;
(7-5) comprehensive descision is made:
If SNR > is SNR w, then air quality judgement not up to standard made by controller, and controller shows air quality information not up to standard in the display, and alarm sends warning message;
If SNR≤SNR w, then air quality judgement up to standard made by controller, and controller shows air quality information up to standard in the display, and controller controls gauge tap and cuts out.
As preferably, also comprise the steps:
(8-1) the gaseous mass threshold value SNR corresponding with each gas sensitization film is preset with in controller p1, SNR p2..., SNR pm; Controller is by I (t) 1, I (t) 2..., I (t) msuccessively in input step (7-4), obtain m output signal-to-noise ratio SNR 1, SNR 2..., SNR m;
If (8-2) SNR i> SNR pi, i=1 ..., m; , i is the sequence number of gas sensitization film, then the judgement that the gas corresponding to i-th gas sensitization film exceeds standard made by controller, and controller demonstrates the information that this kind of gas exceeds standard in the display, and alarm sends warning message.
As preferably, the time that cleaning course continues is 30 seconds to 2 minutes; The time that testing process continues is 30 to 120 seconds.
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 carries out automatically; ;
(2) both overall assessment can be carried out to the air quality in car, also concentration monitor can be carried out to various harmful gas;
(3) warning message can be sent in time, for healthy the providing of people provides powerful support for and can detect.
Accompanying drawing explanation
Fig. 1 is a kind of theory diagram of the present invention;
Fig. 2 is a kind of structural drawing of the present invention;
Fig. 3 is a kind of structural drawing of draft tube of the present invention and gas outlet;
Fig. 4 is a kind of structural representation of gas sensitization film of the present invention;
Fig. 5 is a kind of process flow diagram of embodiments of the invention.
In figure: controller 1, storer 2, alarm 3, display 4, gauge tap 5, housing 6, cylindrical shell 7, motor 8, draft tube 9, gas outlet 10, exhausr port 11, first solenoid valve 12, air pump 13, second solenoid valve 14, operational amplifier 15, data collecting card 16, gas sensitization film 17, the 3rd solenoid valve 18, transverse tube 19, vertical tube 20, crossbeam 21, insulating circuit board 22, cross 23, heating pin 24, detection pin 25, fixing pin 26.
Embodiment
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 pick-up unit, comprises the controller 1 be located on the instrument desk of automobile, storer 2, pick-up unit, alarm 3, display 4 and gauge tap 5; Pick-up unit comprises housing 6, is located at the cylindrical shell 7 of the lower ending opening of housing upper, as shown in Figure 3, the gas outlet 10 being provided with draft tube 9 in cylindrical shell and being connected with draft tube, gas outlet is provided with cross 23, housing is provided with crossbeam 21, crossbeam is provided with motor 8, cross is connected with the rotating shaft of motor by column, lower housing portion is provided with exhausr port 11, exhausr port is provided with the first solenoid valve 12, draft tube is provided with air pump 13 and the second solenoid valve 14, and draft tube is stretched out outside cylindrical shell, and gas outlet is provided with the venthole of arrangement;
Be provided with head tank, operational amplifier 15 and data collecting card 16 that clean air is housed in housing, be provided with insulating circuit board 22 in the housing below gas outlet, as shown in Figure 4, insulating circuit board is provided with 10 for detecting the gas sensitization film 17 of gas with various; Head tank is connected with draft tube by purge pipe, purge pipe is provided with the 3rd solenoid valve 18, each gas sensitization film is electrically connected with the input end of operational amplifier respectively, as shown in Figure 1, the output terminal of operational amplifier is electrically connected with data collecting card, and controller is electrically connected with the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, motor, data collecting card, alarm, storer, display, air pump and gauge tap respectively.
As shown in Figure 3, draft tube comprises ring pipe, the transverse tube 19 be connected with ring pipe and vertical tube 20; Gas outlet ringwise, draft tube is positioned at above gas outlet, and draft tube is connected with gas outlet by vertical tube, and transverse tube stretches out outside cylindrical shell, each venthole at exhaust pipe lower part circumferentially, is less than the aperture of the vent port away from vertical tube near the aperture of the vent port of vertical tube.
Cylindrical shell between draft tube and gas outlet is provided with circular baffle plate, and baffle edge embeds to be located in the annular groove of cylinder inboard wall, and chute downside is provided with leakage-proof ring, and vertical tube is through baffle plate.
10 gas sensitization films are respectively the gas sensitization film for detecting sulfide, hydrogen, alcohol, toluene, dimethylbenzene, carbon monoxide, carbon dioxide, methane, propane and oxides of nitrogen.
As shown in Figure 4, gas sensitization film is the cylindrical shape of both ends open, resistive heater is provided with in the cavity of gas sensitization film, resistive heater two ends are connected with power electric respectively by heating pin 24, gas sensitization film is provided with two and detects pins 25 and two fixing pins 26, two being connected with insulating circuit board 22 and detect pin and be electrically connected with the in-phase input end of operational amplifier and inverting input respectively.
Operational amplifier is UPC4570 low noise computing paster amplifier, and data collecting card is the low-power-consumption embedded data collecting card based on MSP430F5438, and controller is the low-power-consumption embedded MCU of MSP430F149.In head tank, the pressure of clean air is 3 atmospheric pressure.
SNR wutilize method of the present invention to detect by the air that any one concentration comprised in sulfide, hydrogen, alcohol, toluene, dimethylbenzene, carbon monoxide, carbon dioxide, methane, propane and oxides of nitrogen just exceeded standard, and the air comprising the gas that wherein any number of concentration has just exceeded standard is detected, be averaging detecting the snr value that obtains and the SNR that obtains w.
As shown in Figure 5, a kind of detection method of in-car air quality pick-up unit, comprises the steps:
Air quality threshold SNR is preset with in controller w, be provided with one deck accidental resonance model in storer:
wherein, V (x, t) is potential function, and x (t) is Brownian movement Particles Moving lopcus function, and a, b are the constant of setting, and ξ (t) is external noise, and D is external noise intensity, and N (t) grasps noise in being, for periodic sinusoidal signal, A is signal amplitude, and f is signal frequency, and t is run duration, for phase place,
Step 100, gas sensitization film is cleaned:
When gauge tap is opened, controller controls the first, the 3rd solenoid valve and opens, with clean air to the gas sensitization Membrane cleaning in housing 50 seconds; Clean air under pressure, enters in housing by draft tube and gas outlet, discharges outside housing by exhausr port;
Step 200, Detection of Air Quality:
After cleaning, controller controls the first, the 3rd closed electromagnetic valve, and the second solenoid valve is opened; And controlling motor and air pump work, driven by motor cylindrical shell horizontally rotates, and the gas in compartment enters in draft tube with the speed of 400mL/min and detects 1 minute, and after detection, controller controls the second closed electromagnetic valve;
In testing process, gas contacts with each gas sensitization film, and each gas sensitization film produces response signal I (t) respectively 1, I (t) 2..., I (t) m, controller calculates the average signal of each response signal, and average signal is defined as detection signal I (t);
Step 300, data processing:
Step 310, detection signal I (t) inputs in one deck accidental resonance model by controller, and controller calculates V (x, t) for the first order derivative of x (t) and second derivative, and make equation equal 0, obtain two layers of accidental resonance model:
setting noise intensity D=0, i (t)=0, N (t)=0; The critical value calculating A is
Step 320, substitutes into the critical value of A in one deck accidental resonance model, and sets X 0(t)=0, sn 0=0, with quadravalence jade for asking rain Ge Kuta Algorithm for Solving one deck accidental resonance model, obtain 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 ( a x n - 1 ( t ) - b x n - 1 3 ( t ) + s n 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 + s n 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 + s n n + 1 ] ;
Wherein, x nt n order derivative that () is x (t), sn n-1the value of n-1 order derivative at t=0 place of S (t), sn n+1the value of n+1 order derivative at t=0 place of S (t), n=0,1 ..., N-1; Obtain x 1(t), x 2(t) ..., x n+1the value of (t);
Step 330, controller is to x 1(t), x 2(t) ..., x n+1t () carries out integration, obtain the x (t) determined, and obtains x (t) produces accidental resonance moment position x in the double-deck stochastic system of one deck accidental resonance model and two layers of accidental resonance model composition mvalue and x mcorresponding resonance moment t 1and and t 1corresponding noise D 1, D 1for the value of in D;
Step 340, controller utilizes formula calculate the signal to noise ratio (S/N ratio) that double-deck stochastic resonance system exports; Wherein, Δ U=a 2/ 4b; Obtain output signal-to-noise ratio SNR;
Step 400, make comprehensive descision:
If SNR > is SNR w, then air quality judgement not up to standard made by controller, and controller shows air quality information not up to standard in the display, and alarm sends warning message;
If SNR≤SNR w, then air quality judgement up to standard made by controller, and controller shows air quality information up to standard in the display, and controller controls gauge tap and cuts out.
Embodiment 2
Also comprise the steps:
The gaseous mass threshold value SNR corresponding with each gas sensitization film is preset with in controller p1, SNR p2..., SNR pm; Controller is by I (t) 1, I (t) 2..., I (t) msuccessively in input step (7-4), obtain m output signal-to-noise ratio SNR 1, SNR 2..., SNR m;
If SNR i> SNR pi, i=1 ..., m; , i is the sequence number of gas sensitization film, then the judgement that the gas corresponding to i-th gas sensitization film exceeds standard made by controller, and controller demonstrates the information that this kind of gas exceeds standard in the display, and alarm sends warning message.
Other structure in embodiment 2 and step part in the same manner as in Example 1.
SNR p1, SNR p2..., SNR pmin any one be all that corresponding gas by concentration known just having been exceeded standard utilizes method of the present invention to carry out the numerical value detected and data processing obtains, and repeatedly detect repeatedly, the mean value calculating repeatedly numerical value obtains.
Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.

Claims (10)

1. an in-car air quality pick-up unit, it is characterized in that, comprise the controller (1) be located on the instrument desk of automobile, storer (2), pick-up unit, alarm (3), display (4) and gauge tap (5); Described pick-up unit comprises housing (6), is located at the cylindrical shell (7) of the lower ending opening of housing upper, cylindrical shell be located at being connected for the motor (8) driving cylindrical shell to horizontally rotate in housing, the gas outlet (10) being provided with draft tube (9) in described cylindrical shell and being connected with draft tube, lower housing portion is provided with exhausr port (11), exhausr port is provided with the first solenoid valve (12), draft tube is provided with air pump (13) and the second solenoid valve (14), draft tube is stretched out outside cylindrical shell, and gas outlet is provided with the venthole of several arrangements;
Being provided with head tank, operational amplifier (15) and data collecting card (16) that clean air is housed in housing, being provided with m in the housing below gas outlet for detecting the gas sensitization film (17) of gas with various; Head tank is connected with draft tube by purge pipe, purge pipe is provided with the 3rd solenoid valve (18), each gas sensitization film is electrically connected with the input end of operational amplifier respectively, the output terminal of operational amplifier is electrically connected with data collecting card, and controller is electrically connected with the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, motor, data collecting card, alarm, storer, display, air pump and gauge tap respectively.
2. in-car air quality pick-up unit according to claim 1, is characterized in that, described draft tube comprises ring pipe, the transverse tube (19) be connected with ring pipe and vertical tube (20); Gas outlet ringwise, draft tube is positioned at above gas outlet, and draft tube is connected with gas outlet by vertical tube, and transverse tube stretches out outside cylindrical shell, each venthole at exhaust pipe lower part circumferentially, is less than the aperture of the vent port away from vertical tube near the aperture of the vent port of vertical tube.
3. in-car air quality pick-up unit according to claim 2, it is characterized in that, the cylindrical shell between draft tube and gas outlet is provided with circular baffle plate, and baffle edge embeds to be located in the annular groove of cylinder inboard wall, chute downside is provided with leakage-proof ring, and vertical tube is through baffle plate.
4. in-car air quality pick-up unit according to claim 1, it is characterized in that, described m is the gas sensitization film that 10,10 gas sensitization films are respectively for detecting sulfide, hydrogen, alcohol, toluene, dimethylbenzene, carbon monoxide, carbon dioxide, methane, propane and oxides of nitrogen.
5. in-car air quality pick-up unit according to claim 1, it is characterized in that, described gas sensitization film is the cylindrical shape of both ends open, resistive heater is provided with in the cavity of gas sensitization film, resistive heater two ends are connected with power electric respectively by heating pin (24), gas sensitization film is provided with two and detects pin (25) and two fixing pins (26), and two detection pins are electrically connected with the in-phase input end of operational amplifier and inverting input respectively.
6. the in-car air quality pick-up unit according to claim 1 or 2 or 3 or 5, it is characterized in that, operational amplifier is UPC4570 low noise computing paster amplifier, data collecting card is the low-power-consumption embedded data collecting card based on MSP430F5438, and controller is the low-power-consumption embedded MCU of MSP430F149.
7. be applicable to a detection method for in-car air quality pick-up unit according to claim 1, it is characterized in that, comprise the steps:
(7-1) air quality threshold SNR is preset with in controller w, be provided with one deck accidental resonance model in storer:
wherein, V (x, t) is potential function, and x (t) is Brownian movement Particles Moving lopcus function, and a, b are the constant of setting, and ξ (t) is external noise, and D is external noise intensity, and N (t) grasps noise in being, for periodic sinusoidal signal, A is signal amplitude, and f is signal frequency, and t is run duration, for phase place;
(7-2) gas sensitization film is cleaned:
When gauge tap is opened, controller control the first, the 3rd solenoid valve is opened and is cleaned the gas sensitization film in housing with clean air; Clean air under pressure, enters in housing by draft tube and gas outlet, discharges outside housing by exhausr port;
(7-3) Detection of Air Quality:
After cleaning, controller controls the first, the 3rd closed electromagnetic valve, and the second solenoid valve is opened; And controlling motor and air pump work, driven by motor cylindrical shell horizontally rotates, and the gas in compartment enters in draft tube and detects, and after detection, controller controls the second closed electromagnetic valve;
In testing process, gas contacts with each gas sensitization film, and each gas sensitization film produces response signal I (t) respectively 1, I (t) 2..., I (t) m, controller calculates the average signal of each response signal, and average signal is defined as detection signal I (t);
(7-4) data processing:
(7-4-1) detection signal I (t) inputs in one deck accidental resonance model by controller, controller calculates V (x, t) for first order derivative and the second derivative of x (t), and make equation equal 0, obtain two layers of accidental resonance model:
setting noise intensity D=0, i (t)=0, N (t)=0; The critical value calculating A is
(7-4-2) critical value of A is substituted in one deck accidental resonance model, and set X 0(t)=0, sn 0=0, with quadravalence jade for asking rain Ge Kuta Algorithm for Solving one deck accidental resonance model, obtain 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 ( a x n - 1 ( t ) - b x n - 1 3 ( t ) + s n 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 + s n 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 + s n n + 1 ] ;
Wherein, x nt n order derivative that () is x (t), sn n-1the value of n-1 order derivative at t=0 place of S (t), sn n+1the value of n+1 order derivative at t=0 place of S (t), n=0,1 ..., N-1; Obtain x 1(t), x 2(t) ..., x n+1the value of (t);
(7-4-3) controller is to x 1(t), x 2(t) ..., x n+1t () carries out integration, obtain the x (t) determined, and obtains x (t) produces accidental resonance moment position x in the double-deck stochastic system of one deck accidental resonance model and two layers of accidental resonance model composition mvalue and x mcorresponding resonance moment t 1and and t 1corresponding noise D 1, D 1for the value of in D;
(7-4-4) controller utilizes formula calculate the signal to noise ratio (S/N ratio) that double-deck stochastic resonance system exports; Wherein, Δ U=a 2/ 4b; Obtain output signal-to-noise ratio SNR;
(7-5) comprehensive descision is made:
If SNR > is SNR w, then air quality judgement not up to standard made by controller, and controller shows air quality information not up to standard in the display, and alarm sends warning message;
If SNR≤SNR w, then air quality judgement up to standard made by controller, and controller shows air quality information up to standard in the display, and controller controls gauge tap and cuts out.
8. the detection method of in-car air quality pick-up unit according to claim 7, is characterized in that, also comprise the steps:
(8-1) the gaseous mass threshold value SNR corresponding with each gas sensitization film is preset with in controller p1, SNR p2..., SNR pm; Controller is by I (t) 1, I (t) 2..., I (t) msuccessively in input step (7-4), obtain m output signal-to-noise ratio SNR 1, SNR 2..., SNR m;
If (8-2) SNR i> SNR pi, i=1 ..., m; , i is the sequence number of gas sensitization film, then the judgement that the gas corresponding to i-th gas sensitization film exceeds standard made by controller, and controller demonstrates the information that this kind of gas exceeds standard in the display, and alarm sends warning message.
9. the detection method of in-car air quality pick-up unit according to claim 7, is characterized in that, the time that cleaning course continues is 30 seconds to 2 minutes; The time that testing process continues is 30 to 120 seconds.
10. the detection method of the in-car air quality pick-up unit according to claim 6 or 7 or 8, is characterized in that, in car, gas is by with in the speed suction casing of 360mL/min to 570mL/min.
CN201410384662.3A 2014-08-07 2014-08-07 In-car air quality checkout gear and detection method Active CN104237327B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410384662.3A CN104237327B (en) 2014-08-07 2014-08-07 In-car air quality checkout gear and detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410384662.3A CN104237327B (en) 2014-08-07 2014-08-07 In-car air quality checkout gear and detection method

Publications (2)

Publication Number Publication Date
CN104237327A true CN104237327A (en) 2014-12-24
CN104237327B CN104237327B (en) 2016-05-18

Family

ID=52225825

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410384662.3A Active CN104237327B (en) 2014-08-07 2014-08-07 In-car air quality checkout gear and detection method

Country Status (1)

Country Link
CN (1) CN104237327B (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104816606A (en) * 2015-03-26 2015-08-05 盐城工学院 Cyclically circulating diversion pipe type car passenger compartment air quality detector
CN105136984A (en) * 2015-08-12 2015-12-09 浙江工商大学 Detection device and method for volatile methanol in experimental environment
CN105136987A (en) * 2015-08-12 2015-12-09 浙江工商大学 Detection apparatus and detection method for formaldehyde concentration in laboratory
CN105158415A (en) * 2015-08-12 2015-12-16 浙江工商大学 Device and method for detecting concentration of toluene diisocyanate in laboratory
CN105242006A (en) * 2015-09-17 2016-01-13 浙江工商大学 Detection apparatus for carbon monoxide in laboratory environment and detection method
CN105301185A (en) * 2015-09-17 2016-02-03 浙江工商大学 Laboratory methane leakage detection device and detection method
CN105527375A (en) * 2015-09-17 2016-04-27 浙江工商大学 Device and method for detecting sulfur dioxide in experiment environment
CN105588918A (en) * 2015-09-17 2016-05-18 浙江工商大学 System and method for detecting nitric oxide in experimental environment
CN107132316A (en) * 2017-05-19 2017-09-05 芜湖普唯特智能装备有限公司 A kind of gas sensing equipment
CN107328900A (en) * 2017-08-31 2017-11-07 广东美的制冷设备有限公司 Air detecting device
CN108489033A (en) * 2018-03-07 2018-09-04 广东美的制冷设备有限公司 Adjustment control method, air regulator and the readable storage medium storing program for executing of room air
CN108956875A (en) * 2018-07-03 2018-12-07 浙江农林大学 A kind of laboratory safety monitoring system and method based on Internet of Things
CN109030566A (en) * 2018-07-03 2018-12-18 浙江农林大学 A kind of laboratory air leak diagnostic apparatus and method
CN109030731A (en) * 2018-07-03 2018-12-18 浙江农林大学 A kind of laboratory safety monitoring system and its working method
CN112946197A (en) * 2021-02-04 2021-06-11 南京安居防护科技有限公司 Air detection data analysis system and data management method
CN115032329A (en) * 2021-03-08 2022-09-09 博泰车联网科技(上海)股份有限公司 Method and device for monitoring air quality in vehicle, electronic equipment and medium
CN115032329B (en) * 2021-03-08 2024-05-03 博泰车联网科技(上海)股份有限公司 In-vehicle air quality monitoring method and device, electronic equipment and medium

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106680431B (en) * 2016-12-28 2020-01-21 北京新能源汽车股份有限公司 Method and device for detecting quality of air in vehicle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01500459A (en) * 1986-08-02 1989-02-16 ヘルター，ハインツ Device for detecting the content of various harmful substances in gas streams
US6382015B1 (en) * 1998-06-11 2002-05-07 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio sensor resistance detecting apparatus
KR100482490B1 (en) * 2002-05-16 2005-04-14 기아자동차주식회사 Air quality control sensor having temperature sensor for outside door as a one body
DE202005002221U1 (en) * 2005-02-11 2005-05-12 Appliedsensor Gmbh Control module for a motor vehicle ventilation and or air-conditioning unit has sensors for monitoring both exterior and interior air quality together with an air quality evaluation algorithm that runs in a control processor
CN200972475Y (en) * 2006-10-27 2007-11-07 北京康尔兴科技发展有限公司 Air quality monitor
CN201247513Y (en) * 2008-08-22 2009-05-27 重庆大学 Detector for air quality in vehicle
CN202362264U (en) * 2011-11-29 2012-08-01 南昌航空大学 Indoor air quality detector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01500459A (en) * 1986-08-02 1989-02-16 ヘルター，ハインツ Device for detecting the content of various harmful substances in gas streams
US6382015B1 (en) * 1998-06-11 2002-05-07 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio sensor resistance detecting apparatus
KR100482490B1 (en) * 2002-05-16 2005-04-14 기아자동차주식회사 Air quality control sensor having temperature sensor for outside door as a one body
DE202005002221U1 (en) * 2005-02-11 2005-05-12 Appliedsensor Gmbh Control module for a motor vehicle ventilation and or air-conditioning unit has sensors for monitoring both exterior and interior air quality together with an air quality evaluation algorithm that runs in a control processor
CN200972475Y (en) * 2006-10-27 2007-11-07 北京康尔兴科技发展有限公司 Air quality monitor
CN201247513Y (en) * 2008-08-22 2009-05-27 重庆大学 Detector for air quality in vehicle
CN202362264U (en) * 2011-11-29 2012-08-01 南昌航空大学 Indoor air quality detector

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
万征 等: "空调客车车内空气质量分析", 《山东交通科技》, no. 4, 31 December 2007 (2007-12-31), pages 86 - 89 *
徐悦桐 等: "室内空气质量在线动态监测在奥运保障中的应用", 《中国煤炭工业医学杂志》, vol. 13, no. 12, 31 December 2010 (2010-12-31), pages 1851 - 1853 *
魏凤玉 等: "客车车内空气质量评价", 《合肥工业大学学报(自然科学版)》, vol. 30, no. 8, 31 August 2007 (2007-08-31), pages 992 - 994 *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104816606A (en) * 2015-03-26 2015-08-05 盐城工学院 Cyclically circulating diversion pipe type car passenger compartment air quality detector
CN104816606B (en) * 2015-03-26 2016-08-31 盐城工学院 Circulation honeycomb duct type vehicle occupant compartment air quality detector
CN105136984A (en) * 2015-08-12 2015-12-09 浙江工商大学 Detection device and method for volatile methanol in experimental environment
CN105136987A (en) * 2015-08-12 2015-12-09 浙江工商大学 Detection apparatus and detection method for formaldehyde concentration in laboratory
CN105158415A (en) * 2015-08-12 2015-12-16 浙江工商大学 Device and method for detecting concentration of toluene diisocyanate in laboratory
CN105242006A (en) * 2015-09-17 2016-01-13 浙江工商大学 Detection apparatus for carbon monoxide in laboratory environment and detection method
CN105301185A (en) * 2015-09-17 2016-02-03 浙江工商大学 Laboratory methane leakage detection device and detection method
CN105527375A (en) * 2015-09-17 2016-04-27 浙江工商大学 Device and method for detecting sulfur dioxide in experiment environment
CN105588918A (en) * 2015-09-17 2016-05-18 浙江工商大学 System and method for detecting nitric oxide in experimental environment
CN107132316A (en) * 2017-05-19 2017-09-05 芜湖普唯特智能装备有限公司 A kind of gas sensing equipment
CN107328900A (en) * 2017-08-31 2017-11-07 广东美的制冷设备有限公司 Air detecting device
CN108489033A (en) * 2018-03-07 2018-09-04 广东美的制冷设备有限公司 Adjustment control method, air regulator and the readable storage medium storing program for executing of room air
CN108956875A (en) * 2018-07-03 2018-12-07 浙江农林大学 A kind of laboratory safety monitoring system and method based on Internet of Things
CN109030566A (en) * 2018-07-03 2018-12-18 浙江农林大学 A kind of laboratory air leak diagnostic apparatus and method
CN109030731A (en) * 2018-07-03 2018-12-18 浙江农林大学 A kind of laboratory safety monitoring system and its working method
CN109030731B (en) * 2018-07-03 2020-12-11 浙江农林大学 Laboratory safety monitoring system and working method thereof
CN109030566B (en) * 2018-07-03 2021-01-19 浙江农林大学 Laboratory gas leakage diagnosis device and method
CN112946197A (en) * 2021-02-04 2021-06-11 南京安居防护科技有限公司 Air detection data analysis system and data management method
CN115032329A (en) * 2021-03-08 2022-09-09 博泰车联网科技(上海)股份有限公司 Method and device for monitoring air quality in vehicle, electronic equipment and medium
CN115032329B (en) * 2021-03-08 2024-05-03 博泰车联网科技(上海)股份有限公司 In-vehicle air quality monitoring method and device, electronic equipment and medium

Also Published As

Publication number Publication date
CN104237327B (en) 2016-05-18

Similar Documents

Publication Publication Date Title
CN104237327A (en) Device and method for detecting in-vehicle air quality
JP2015057342A5 (en)
US10006895B2 (en) System and method for monitoring atmospheric pollution
CN107054014B (en) method and device for detecting service life of automobile air conditioner filter screen
CN206248286U (en) Gas leak tester
CN108956875B (en) Laboratory safety monitoring system and method based on Internet of things
JP5437844B2 (en) In-vehicle carbon dioxide concentration increase determination device and in-vehicle safety support system
US7621178B2 (en) Method and apparatus for determining the volume of fuel in a vehicle fuel tank
JP4901401B2 (en) Alcohol detection device and alcohol detection method
CN201464362U (en) Five-component automobile exhaust analyzer
CN203727318U (en) Intelligent vehicle-mounted terminal of bus
CN208888104U (en) A kind of portable automobile tail-gas analyzer
CN104089987A (en) Portable frozen beef product quality detection device and detection method using the same
US20090118893A1 (en) Method of integrated detection for automobile instruments
CN112198208B (en) Formaldehyde detection method and formaldehyde detection device
JP6049568B2 (en) Outside air information presentation device for vehicles
CN205220592U (en) Car inner environment monitoring alarm device
CN107146367A (en) A kind of detection of natural gas and temperature alarm system
CN109781931A (en) A kind of active carbon gas absorption performance simulating-estimating device
CN202929006U (en) Interior harmful gas early warning device
CN109551972A (en) A kind of automobile tire detection device for foreign matter and its detection method
CN107176005A (en) A kind of vehicle interior air quality optimization method and device
CN206893060U (en) A kind of detection of natural gas and temperature alarm system
CN205785285U (en) A kind of new car external environment detecting system
CN205374418U (en) Multiple sensor fusion's SF6 analyte on -line monitoring device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant