CN105319178A - Real-time detection system of C0 and CO2 concentration in motor vehicle tail gas and control method of real-time detection system - Google Patents
Real-time detection system of C0 and CO2 concentration in motor vehicle tail gas and control method of real-time detection system Download PDFInfo
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- CN105319178A CN105319178A CN201510716165.3A CN201510716165A CN105319178A CN 105319178 A CN105319178 A CN 105319178A CN 201510716165 A CN201510716165 A CN 201510716165A CN 105319178 A CN105319178 A CN 105319178A
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Abstract
The invention belongs to the technical field of gas concentration detection based on infrared spectroscopy, and particularly relates to a real-time detection system of C0 and CO2 concentration in motor vehicle tail gas. The absorption spectrum of a first gas and a second gas which are to be detected has an overlapping region. The real-time detection system comprises a first gas detection unit and a second gas detection unit, wherein a first sample tank of the first gas detection unit comprises a first chamber and a second chamber; the first chamber is filled with the second gas with the concentration of 100%; the to-be-detected gases are introduced into the second chamber and a second sample tank of the second gas detection unit; the infrared light emitted by a light source is converted into an electric signal after passing the first gas detection unit and the second gas detection unit, and the electric signal is output to a processing unit; the concentration of the first gas and the second gas is obtained after the processing of the processing unit. The invention also discloses a control method of the system. According to the real-time detection system, the two chambers are arranged in the first gas detection unit, and one chamber is filled with the second gas with the concentration of 100%, so that the interference of the second gas to the detection of the first gas can be eliminated.
Description
Technical field
The invention belongs to the Gas Thickness Detecting Technology field based on infrared spectrum, particularly a kind of motor-vehicle tail-gas CO and CO
2concentration real-time detecting system and control method thereof.
Background technology
Along with socioeconomic develop rapidly, the recoverable amount of motor vehicle also increases sharply thereupon.While the popularizing of motor vehicle brings great convenience to people's lives, also result in serious environmental problem, current motor-vehicle tail-gas has become the primary pollution source of air.CO and CO
2one of main objectionable constituent in motor-vehicle tail-gas, according to statistics, in urban air pollution 20% CO
2, the CO of 60 ~ 70% comes from motor-vehicle tail-gas.The emission standard of having promulgated is all to CO and CO in motor-vehicle tail-gas
2concentration have strict restriction, in order to ensure that these regulations are effectively implemented, accurately reliably motor-vehicle tail-gas CO and CO must be developed
2concentration real-time detecting system.
Non-dispersion infrared (NondispersiveInfrared, NDIR) detection system is a kind of gas detecting system obtaining gas concentration to be measured by measuring the absorption intensity of gas molecule to be measured to infrared light specific band energy, have structure simple, multiple gases can be measured simultaneously, highly sensitive, respond the features such as fast.Non-dispersion infrared detection system detects CO and CO at present
2the system that concentration is commonly used the most.Existing non-dispersion infrared detection system is used for motor-vehicle tail-gas CO and CO
2concentration Testing has the following disadvantages: the detection sensitivity of (1) non-dispersion infrared detection system to certain gas to be measured depends primarily on absorption light path, for obtaining best detection sensitivity, the selection absorbing light path should determine the absorption intensity of infrared light and detectable concentration scope according to gas to be measured, and existing non-dispersion infrared detection system completes CO and CO in simple sample pond
2the detection of concentration, i.e. CO and CO
2detection light path identical, but in tail gas, CO concentration is generally 1 ~ 3%, CO
2concentration is generally greater than 10%, and CO
2stronger to the absorptance CO of infrared light, according to above-mentioned detection light path choice criteria, CO
2detection light path should be significantly smaller than the detection light path of CO, the design in simple sample pond can not meet CO and CO simultaneously
2the requirement of high detection sensitivity; (2) CO that existing non-dispersion infrared detection system uses measures wave band and CO
2infrared absorption spectrum exists overlapping, due to CO in tail gas
2dense, large to infrared Absorption intensity, CO
2change on infrared energy in CO measurement wave band the impact caused can not ignore, if do not calibrated, CO Concentration Testing resultant error can be very large.Here just with CO and CO
2for example, in fact, there are other gases overlapping and that two gas concentration difference is large when detecting in the absorption spectrum for other, all can occur the phenomenon that error is large.
Summary of the invention
Primary and foremost purpose of the present invention is to provide a kind of highly sensitive motor-vehicle tail-gas CO and CO
2concentration real-time detecting system, can detect that absorption spectrum exists two kinds of gas concentrations of overlapping phenomenon efficiently and accurately.
For realizing above object, the technical solution used in the present invention is: a kind of motor-vehicle tail-gas CO and CO
2concentration real-time detecting system, to be detected first, there is overlapping region in the absorption spectrum of two gases, comprise the first gas detection cell and the second gas detection cell, first sample cell of described first gas detection cell comprises first, two chambers, the second gas of 100% concentration is filled with in first chamber, gas to be detected is passed in second sample cell of the second chamber and the second gas detection cell, the infrared light of light source injection is through first, convert electric signal to after two gas detection cell and export processing unit to, first is obtained after processing unit processes, the concentration of two gases.
Compared with prior art, there is following technique effect in the present invention: arranges two chambers by the first gas detection cell wherein, be filled with the second gas of 100% concentration in one of them chamber, so just can eliminate the interference of the second gas to the first gas detect.
Another object of the present invention is to provide a kind of highly sensitive motor-vehicle tail-gas CO and CO
2concentration real-time detecting system, can detect that absorption spectrum exists two kinds of gas concentrations of overlapping phenomenon efficiently and accurately.
For realizing above object, the technical solution used in the present invention is: a kind of motor-vehicle tail-gas CO and CO
2the control method of concentration real-time detecting system, comprises the steps: that detection system is carried out preheating by (A); (B) according to the Concentration Testing scope 0≤C≤C of the first gas
mAX1demarcate concentration C at equal intervals for selected one group
m, wherein m=0,1,2,3 ..., x and C
0=0, C
x=C
mAX1; In the second chamber, pass into concentration successively equal to demarcate concentration C
mthe first gas, and demarcate according to each the signal amplitude U that the first gas detection cell exports under concentration
1mobtain x+1 group data { C
m, U
1m; (C) according to the Concentration Testing scope 0≤C≤C of the second gas
mAX2demarcate concentration C at equal intervals for selected one group
n, wherein n=0,1,2,3 ..., y and C
0=0, C
y=C
mAX2; In the 3rd chamber, pass into concentration successively equal to demarcate concentration C
nthe second gas, and demarcate according to each the signal amplitude U that the second gas detection cell exports under concentration
2nobtain y+1 group data { C
n, U
2n; (D) in second and third chamber, gas to be detected is passed into, the signal amplitude U that processing unit exports according to the first gas detection cell
1and the data { C in step B
m, U
1mthe first gas concentration is obtained by linear interpolation method; The signal amplitude U that processing unit exports according to the second gas detection cell
2and the data { C in step C
n, U
2nthe second gas concentration is obtained by linear interpolation method.
Compared with prior art, there is following technique effect in the present invention: the data benchmark as a reference arrived by first and second gas detect of step B and step C normal concentration, make follow-up process only just can obtain corresponding gas concentration according to the signal amplitude detected by linear interpolation algorithm, process fast, simply, accurately.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the structural representation of spectrophotometric unit of the present invention and first, second and third gas detection cell.
Embodiment
Below in conjunction with Fig. 1 to Fig. 2, the present invention is described in further detail.
Consult Fig. 1, Fig. 2, a kind of motor-vehicle tail-gas CO and CO
2concentration real-time detecting system, to be detected first, there is overlapping region in the absorption spectrum of two gases, comprise the first gas detection cell 30 and the second gas detection cell 40, first sample cell 31 of described first gas detection cell 30 comprises first, two chambers 34, 35, the second gas of 100% concentration is filled with in first chamber 34, gas to be detected is passed in second sample cell 41 of the second chamber 35 and the second gas detection cell 40, the infrared light that light source 10 penetrates is through first, two gas detection cell 30, convert electric signal after 40 to and export processing unit 60 to, first is obtained after processing unit 60 processes, the concentration of two gases.Here by arranging the first chamber 34 in the first gas detection cell, and filling the second gas of 100% concentration in the first chamber 34, thus eliminating the need the impact of the second gas on the first gas, improving the first gas detect precision.First and second gas detection cell 30,40 adopts gas detecting system conventional in prior art.
Gas detecting system has various structures mode, a kind of comparatively concrete embodiment is provided here, the first described gas detection cell 30 comprises the first infrared fileter 32 and the first detector 33, second gas detection cell 40 comprises the second infrared fileter 42 and the second detector 43; First and second infrared fileter 32,42 lay respectively in first and second gas infrared absorption wave band through spectrum, through first and second sample cell 31,41 infrared light respectively through after first and second infrared fileter 32,42 receive by first and second detector 33,43.Here first and second detector 33,43 is thermocouple probe, is absorbed into infrared radiation and produces heat, causes temperature rise, and export after temperature rise being converted to electric signal by various physical influence with detecting element.
As preferred version of the present invention, because the infrared light supply radiation power of light source 10 exists fluctuation, in order to eliminate this impact caused result of fluctuating, the present embodiment comprises the 3rd gas detection cell 50,3rd gas detection cell 50 comprises the 3rd sample cell 51, the 3rd infrared fileter 52 and the 3rd detector 53,3rd infrared fileter 52 be positioned at beyond first and second gas infrared absorption wave band through spectrum, through the infrared light of the 3rd sample cell 51 after the 3rd infrared fileter 52 receive by the 3rd detector 53.After 3rd gas detection cell 50 is set, the fluctuation of light source 10 all has embodiment in first, second and third gas detection cell 30,40,50, when processing unit 60 processes, the no longer independent Output rusults to first and second gas detection cell 30,40 processes, but the ratio of the ratio of the output amplitude of first and third gas detection cell 30,50 and the output amplitude of second and third gas detection cell 40,50 is processed, just eliminate light source 10 and to fluctuate the metrical error caused.
Particularly, first, second and third described sample cell 31,41,51 is the circular tube shaped pond body of uniform internal diameter, the internal diameter in each sample pond is set to equal, just can determines the chamber volume size in each sample pond according to the length of first, second and third sample cell 31,41,51.The two ends of the first sample cell 31 and centre are provided with the window 70 that can pass through infrared radiation, first sample cell 31 is divided into first and second described chamber 34,35 by window 70, and the two ends of second and third sample cell 41,51 all seal with window 70 and form third and fourth chamber 44,54; Here all windows 70 all can pass through infrared radiation.In order to ensure to reach the highest to the detection sensitivity of first and second gas simultaneously, here preferably, 3rd chamber 44 and the second chamber 35 lenth ratio equal the ratio of first and second gas maximum detection range, suppose that the sensing range of the first gas is 0%-10%, the sensing range of the second gas is 0%-20%, so the ratio of the maximum detection range of first and second gas is exactly 10%/20%, equals 1:2, and the length ratio of the 3rd chamber 44 and the second chamber 35 also just selects 1:2.
Preferably, first and third, two described sample cells 31,41,51 are arranged in parallel from top to bottom; The periphery wall of second and third chamber 35,44 is respectively arranged with outlet, inlet mouth 311,411, is all communicated with by pipe 80 between the second chamber 35 and the 4th chamber 54, between the 3rd chamber 44 and the 4th chamber 54.Arrange pipe 80 and second chamber 35, the 4th chamber 54, the 3rd chamber 44 are communicated with common formation gas detect chamber, gas to be detected enters gas detect chamber by air intake opening 411 and is discharged by gas outlet 311.
In order to ensure that gas-detecting cavity indoor are full of gas to be detected equably, the gas outlet 311 of the second chamber 35 and interface tube, the air intake opening 411 of the 3rd chamber 44 and interface tube, two interface tubes of the 4th chamber 54 are all placed in the two ends of place chamber, interface tube and pipe 80 and each chamber connection, this section of words also can be understood as: the interface tube on the gas outlet 311 of the second chamber 35 and the second chamber 35 is positioned at the second chamber 35 two ends along its length and gas outlet 311, pipe 80, first sample cell 31 three axle center coplanar and gas outlet 311 and pipe 80 are postponed in the opposite direction.In like manner, the air intake opening 411 on the 3rd chamber 44 and interface tube are also identical arrangements; Two interface tubes on 4th chamber 54 are also arranged by same way.After arranging like this, the gas to be detected entered from air intake opening 411 can fill full 3rd chamber 44, the 4th chamber 54 and the second chamber 35 equably.
As preferred version of the present invention, first and second described gas is CO, CO respectively
2, the first infrared fileter 32 be positioned at CO infrared absorption wave band through spectrum, the second infrared fileter 42 be positioned at CO through spectrum
2in infrared absorption wave band, the 3rd infrared fileter 52 be positioned at CO and CO through spectrum
2outside infrared absorption wave band.Particularly, the first infrared fileter 32 through spectral centroid wavelength be 4.64 μm, halfwidth is 180nm; Second infrared fileter 42 through spectral centroid wavelength be 4.43 μm, halfwidth is 60nm; The centre wavelength through spectrum of the 3rd infrared fileter 53 is 4 μm, halfwidth is 90nm.When being applied in the detection of vehicle exhaust, the sensing range of CO is 0%-10%, CO
2sensing range be 0%-20%, according to noted earlier and proportionate relationship, described second, four chambers 35,54 isometric, first and third chamber 34,44 isometric and the second chambers 35 are twices of the 3rd chamber 44 length, the CO in the first chamber 34
2gas pressure intensity is a standard atmospheric pressure.
Owing to there is multiple gas detection cell, if arrange multiple light source 10, certainly there are differences between each light source 10, easily cause result treatment error.In the present embodiment preferably, described light source 10 has one, the infrared light that light source 10 penetrates is divided into after three beams through spectrophotometric unit 20 and enters first, second and third sample cell 31,41,51 respectively, and the light beam being divided into three beams identical a light source 10 by spectrophotometric unit, can eliminate error.In the present embodiment, additionally provide the structure that spectrophotometric unit 20 is concrete: spectrophotometric unit 20 comprises collimation lens 21, first beam splitter 22, second beam splitter 23 and catoptron 24, here the first beam splitter 22, second beam splitter 23 and catoptron 24 are level crossing, the splitting ratio of first and second beam splitter 22,23 is 30:70, and the reflectivity of catoptron 24 is greater than 99%.The infrared light that light source 10 penetrates becomes parallel beam after collimation lens 21; Parallel beam beam splitting after the first beam splitter 22 is the first folded light beam and the first transmitted light beam, first folded light beam enters the second sample cell 41, it is the second folded light beam and the second transmitted light beam that first transmitted light beam incides the rear beam splitting of the second beam splitter 23, second folded light beam enters the 3rd sample cell 51, second transmitted light beam and enter the first sample cell 31 after catoptron 24 reflects.Specifically when arranging, on the axial line that the center of the first beam splitter 22, second beam splitter 23, catoptron 24 lays respectively at the second sample cell, the 3rd sample cell, the first sample cell and be that 45° angle is placed with axial line, first beam splitter 22 is placed with collimation lens 21 and light source 10 away from the side of the second beam splitter 23, and the center of light source 10, collimation lens 21, first beam splitter 22, second beam splitter 23, catoptron 24 is all located along the same line.
Present invention also offers a kind of motor-vehicle tail-gas CO and CO
2the control method of concentration real-time detecting system, comprises the steps: that detection system is carried out preheating by (A); (B) according to the Concentration Testing scope 0≤C≤C of the first gas
mAX1demarcate concentration C at equal intervals for selected one group
m, wherein m=0,1,2,3 ..., x and C
0=0, C
x=C
mAX1; In the second chamber 35, pass into concentration successively equal to demarcate concentration C
mthe first gas, and demarcate according to each the signal amplitude U that the first gas detection cell 30 exports under concentration
1mobtain x+1 group data { C
m, U
1m; (C) according to the Concentration Testing scope 0≤C≤C of the second gas
mAX2demarcate concentration C at equal intervals for selected one group
n, wherein n=0,1,2,3 ..., y and C
0=0, C
y=C
mAX2; In the 3rd chamber 44, pass into concentration successively equal to demarcate concentration C
nthe second gas, and demarcate according to each the signal amplitude U that the second gas detection cell 40 exports under concentration
2nobtain y+1 group data { C
n, U
2n; (D) in second and third chamber 35,44, gas to be detected is passed into, the signal amplitude U that processing unit 60 exports according to the first gas detection cell 30
1and the data { C in step B
m, U
1mthe first gas concentration is obtained by linear interpolation method; The signal amplitude U that processing unit 60 exports according to the second gas detection cell 40
2and the data { C in step C
n, U
2nthe second gas concentration is obtained by linear interpolation method.
Here demarcated first and second gas detect result of variable concentrations by step B, C, the data of demarcation are stored in processing unit.Only just need to demarcate in the process used first, just can measure after demarcation, if when systems axiol-ogy is inaccurate after the long period is detected, can demarcation be re-started.The process of demarcating just is equivalent to calibrate on a ruler, after having had scale, just can measure other length.When demarcation, the scale of demarcation is more, and it is larger that parameter x, y namely in step B and C get, and calibration process is more complicated, but correspondingly, the precision of follow-up measurement is also higher.During practical application, select x, y that one suitable.
In addition in step D, calculated by linear interpolation algorithm, the data { C that also can obtain according to step B
m, U
1msimulate functional relation: concentration=f (signal amplitude), then only need bring into signal amplitude in this function in step D and just can obtain corresponding concentration.
As preferred version of the present invention, also comprise the 3rd gas detection cell 50 here, in described step B, in the second chamber 35 and the 4th chamber 54, pass into concentration simultaneously successively equal to demarcate concentration C
mthe first gas, and demarcate according to each the signal amplitude U that first and third gas detection cell 30,50 exports under concentration
1m, U
3mobtain x+1 group data { C
m, R
1m, wherein R
1m=U
1m/ U
3m; In described step C, in the 3rd chamber 44 and the 4th chamber 54, pass into concentration simultaneously successively equal to demarcate concentration C
nthe second gas, and demarcate according to each the signal amplitude U that second and third gas detection cell 40,50 exports under concentration
2n, U
3nobtain y+1 group data { C
n, R
2n; Wherein R
2n=U
2n/ U
3n; In described step D, pass into gas to be detected, the signal amplitude U that processing unit 60 exports according to first, second and third gas detection cell 30,40,50 to second and third, in four chambers 35,44,54
1, U
2, U
3ratio calculated R
1, R
2, wherein R
1=U
1/ U
3, R
2=U
2/ U
3; Processing unit 60 is according to R
1and the data { C in step B
m, R
1mthe first gas concentration is obtained by linear interpolation method; Processing unit is according to R
2and the data { C in step C
n, R
2nthe second gas concentration is obtained by linear interpolation method.Address above, the 3rd gas detection cell 50 is set and can effectively prevents light source 10 to fluctuate the impact caused testing result, reduce error.After 3rd gas detection cell 50 is set, here processed by the ratio of the signal amplitude exported first, second and third gas detection cell 30,40,50, obtain corresponding concentration value, result can be more accurate, and signal amplitude ratio R here reduces along with the increase of concentration.Similarly, also by the ratio funtcional relationship between the two of the data acquisition concentration of demarcation, signal amplitude, then concentration value can be calculated according to this funtcional relationship here.
Be explained in detail linear interpolation method below, described linear interpolation method comprises the steps: that (S1) is according to data { R
11, R
12, R
13..., R
1xdetermine R
1residing interval [R
1a, R
1b], wherein b=a+1, R
1a> R
1> R
1b; (S2) the first gas concentration is obtained according to following formulae discovery:
C in this formula
a, C
br respectively
1a, R
1bthe first corresponding gas concentration value; (S3) according to data { R
21, R
22, R
23..., R
2ydetermine R
2residing interval [R
2a, R
2b], wherein b=a+1, R
2a> R
2> R
2b; (S2) the second gas concentration is obtained according to following formulae discovery:
C in this formula
a, C
br respectively
2a, R
2bthe second corresponding gas concentration value.Briefly, be exactly according to R
1and R
2value, by processing unit 60 store data bring the concentration value that namely formula obtains first and second gas into.
Claims (10)
1. motor-vehicle tail-gas CO and CO
2concentration real-time detecting system, to be detected first, there is overlapping region in the absorption spectrum of two gases, it is characterized in that: comprise the first gas detection cell (30) and the second gas detection cell (40), first sample cell (31) of described first gas detection cell (30) comprises first, two chambers (34, 35), the second gas of 100% concentration is filled with in first chamber (34), gas to be detected is passed in second sample cell (41) of the second chamber (35) and the second gas detection cell (40), the infrared light that light source (10) penetrates is through first, two gas detection cell (30, 40) convert electric signal after to and export processing unit (60) to, first is obtained after processing unit (60) processes, the concentration of two gases.
2. motor-vehicle tail-gas CO and CO as claimed in claim 1
2concentration real-time detecting system, it is characterized in that: described the first gas detection cell (30) comprises the first infrared fileter (32) and the first detector (33), the second gas detection cell (40) comprises the second infrared fileter (42) and the second detector (43); First and second infrared fileter (32,42) lay respectively in first and second gas infrared absorption wave band through spectrum, through first and second sample cell (31,41) infrared light respectively through after first and second infrared fileter (32,42) receive by first and second detector (33,43).
3. motor-vehicle tail-gas CO and CO as claimed in claim 2
2concentration real-time detecting system, it is characterized in that: comprise the 3rd gas detection cell (50), 3rd gas detection cell (50) comprises the 3rd sample cell (51), the 3rd infrared fileter (52) and the 3rd detector (53), 3rd infrared fileter (52) be positioned at beyond first and second gas infrared absorption wave band through spectrum, through the infrared light of the 3rd sample cell (51) after the 3rd infrared fileter (52) receive by the 3rd detector (53).
4. motor-vehicle tail-gas CO and CO as claimed in claim 3
2concentration real-time detecting system, it is characterized in that: described first, second and third sample cell (31,41,51) is the circular tube shaped pond body of uniform internal diameter, the two ends of the first sample cell (31) and centre are provided with the window (70) that can pass through infrared radiation, first sample cell (31) is divided into described first and second chamber (34,35) by window (70), and the two ends of second and third sample cell (41,51) are all used window (70) to seal and formed third and fourth chamber (44,54); 3rd chamber (44) and the second chamber (35) lenth ratio equal the ratio of first and second gas maximum detection range.
5. motor-vehicle tail-gas CO and CO as claimed in claim 4
2concentration real-time detecting system, is characterized in that: described first and third, two sample cells (31,51,41) are arranged in parallel from top to bottom; The periphery wall of second and third chamber (35,44) is respectively arranged with outlet, inlet mouth (311,411), is all communicated with by pipe (80) between the second chamber (35) and the 4th chamber (54), between the 3rd chamber (44) and the 4th chamber (54); Two interface tubes of the air intake opening (411) of the gas outlet (311) of the second chamber (35) and interface tube, the 3rd chamber (44) and interface tube, the 4th chamber (54) are all placed in the two ends of place chamber.
6. motor-vehicle tail-gas CO and CO as claimed in claim 5
2concentration real-time detecting system, is characterized in that: first and second described gas is CO, CO respectively
2, the first infrared fileter (32) be positioned at CO infrared absorption wave band through spectrum, the second infrared fileter (42) be positioned at CO through spectrum
2in infrared absorption wave band, the 3rd infrared fileter (52) be positioned at CO and CO through spectrum
2outside infrared absorption wave band; Described second, four chambers (35,54) are isometric, and isometric and the second chamber (35) of first and third chamber (34,44) is the twice of the 3rd chamber (44) length, the CO in the first chamber (34)
2gas pressure intensity is a standard atmospheric pressure.
7. motor-vehicle tail-gas CO and CO as claimed in claim 5
2concentration real-time detecting system, it is characterized in that: described light source (10) has one, the infrared light that light source (10) penetrates enters first, second and third sample cell (31,41,51) respectively after spectrophotometric unit (20) is divided into three beams; Spectrophotometric unit (20) comprises collimation lens (21), the first beam splitter (22), the second beam splitter (23) and catoptron (24), and the infrared light that light source (10) penetrates becomes parallel beam after collimation lens (21); Parallel beam beam splitting after the first beam splitter (22) is the first folded light beam and the first transmitted light beam, first folded light beam enters the second sample cell (41), first transmitted light beam incide the second beam splitter (23) afterwards beam splitting be the second folded light beam and the second transmitted light beam, second folded light beam enters the 3rd sample cell (51), second transmitted light beam enters the first sample cell (31) after catoptron (24) reflection, and the splitting ratio of first and second beam splitter (22,23) is 30:70.
8. motor-vehicle tail-gas CO and CO as claimed in claim 1
2the control method of concentration real-time detecting system, comprises the steps:
(A) detection system is carried out preheating;
(B) according to the Concentration Testing scope 0≤C≤C of the first gas
mAX1demarcate concentration C at equal intervals for selected one group
m, wherein m=0,1,2,3 ..., x and C
0=0, C
x=C
mAX1; In the second chamber (35), pass into concentration successively equal to demarcate concentration C
mthe first gas, and demarcate according to each the signal amplitude U that the first gas detection cell (30) exports under concentration
1mobtain x+1 group data { C
m, U
1m;
(C) according to the Concentration Testing scope 0≤C≤C of the second gas
mAX2demarcate concentration C at equal intervals for selected one group
n, wherein n=0,1,2,3 ..., y and C
0=0, C
y=C
mAX2; In the 3rd chamber (44), pass into concentration successively equal to demarcate concentration C
nthe second gas, and demarcate according to each the signal amplitude U that the second gas detection cell (40) exports under concentration
2nobtain y+1 group data { C
n, U
2n;
(D) in second and third chamber (35,44), gas to be detected is passed into, the signal amplitude U that processing unit (60) exports according to the first gas detection cell (30)
1and the data { C in step B
m, U
1mthe first gas concentration is obtained by linear interpolation method; The signal amplitude U that processing unit (60) exports according to the second gas detection cell (40)
2and the data { C in step C
n, U
2nthe second gas concentration is obtained by linear interpolation method.
9. motor-vehicle tail-gas CO and CO as claimed in claim 8
2the control method of concentration real-time detecting system, is characterized in that: comprise the 3rd gas detection cell (50),
In described step B, in the second chamber (35) and the 4th chamber (54), pass into concentration simultaneously successively equal to demarcate concentration C
mthe first gas, and demarcate according to each the signal amplitude U that first and third gas detection cell (30,50) exports under concentration
1m, U
3mobtain x+1 group data { C
m, R
1m, wherein R
1m=U
1m/ U
3m;
In described step C, in the 3rd chamber (44) and the 4th chamber (54), pass into concentration simultaneously successively equal to demarcate concentration C
nthe second gas, and demarcate according to each the signal amplitude U that second and third gas detection cell (40,50) exports under concentration
2n, U
3nobtain y+1 group data { C
n, R
2n; Wherein R
2n=U
2n/ U
3n;
In described step D, to second and third, four chambers pass into gas to be detected in (35,44,54), the signal amplitude U that processing unit (60) exports according to first, second and third gas detection cell (30,40,50)
1, U
2, U
3ratio calculated R
1, R
2, wherein R
1=U
1/ U
3, R
2=U
2/ U
3; Processing unit (60) is according to R
1and the data { C in step B
m, R
1mthe first gas concentration is obtained by linear interpolation method; Processing unit is according to R
2and the data { C in step C
n, R
2nthe second gas concentration is obtained by linear interpolation method.
10. motor-vehicle tail-gas CO and CO as claimed in claim 9
2the control method of concentration real-time detecting system, is characterized in that: described linear interpolation method comprises the steps:
(S1) according to data { R
11, R
12, R
13..., R
1xdetermine R
1residing interval [R
1a, R
1b], wherein b=a+1, R
1a> R
1> R
1b;
(S2) the first gas concentration is obtained according to following formulae discovery:
C in this formula
a, C
br respectively
1a, R
1bthe first corresponding gas concentration value;
(S3) according to data { R
21, R
22, R
23..., R
2ydetermine R
2residing interval [R
2a, R
2b], wherein b=a+1, R
2a> R
2> R
2b;
(S2) the second gas concentration is obtained according to following formulae discovery:
C in this formula
a, C
br respectively
2a, R
2bthe second corresponding gas concentration value.
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