CN100427952C - Measuring device and its method for motor vehicle exhaust pollutant total amount - Google Patents

Abstract

The present invention relates to a measuring device for the total amount of pollutants discharged by a motor vehicle and a method thereof. The present invention discloses a measuring device for measuring the total amount of pollutants discharged by a motor vehicle by the contrast between the concentration of CO2 discharged by the motor vehicle and the diluted concentration of CO2 discharged by the motor vehicle and a measuring method thereof. The present invention effectively utilizes the characteristics of high stability of CO2 concentration measurement and good consistency. By measurement and calculation, the dilution ratio of CO2 discharged by the motor vehicle is obtained; by measuring the temperature, the pressure, the flow quantity and the concentration of HC, CO, NO and CO2 which are discharged by the motor vehicle, the total amount of pollutants actually discharged by the motor vehicle can be conveniently and feasibly calculated. The pollutants actually discharged by the motor vehicle with different discharge capacity can be accurately and effectively measured, the measuring results are accurate, and the present invention has the advantages of high precision and high cost performance.

Description

A kind of measurement mechanism of motor vehicle emission pollutant total amount and method thereof

Technical field

The present invention relates to a kind of measurement mechanism and method thereof of motor vehicle emission pollutant total amount.

Background technology

The measurement mechanism of measurement motor vehicle emission pollutant commonly used and the method for measurement thereof, mainly be to utilize a kind of light absorption infrared analyzer that is regardless of, utilize the characteristic absorption at infrared region such as CO and HC, adopt infrared radiation detection apparatus to detect the energy that it absorbs, and transfer modulated low frequency electric signal to, through directly indicating the concentration of tested automobile exhausting after the amplification rectification.Because this measuring instrument only energy measurement goes out the concentration of the waste gas that vehicular emission goes out, yet, when a discharge capacity is that 1000 milliliters motor vehicle and a discharge capacity is the concentration of 3000 milliliters the motor vehicle waste gas of discharging when identical, how many total amounts that this measuring instrument then can't be measured the pollutant of this motor vehicle actual discharge is.Therefore, the method for the measurement mechanism of this measurement motor vehicle emission pollutant and measurement exists: the actual blowdown flow rate problem that can't reflect measured motor vehicle faithfully.U.S. Pat 6085582 discloses a kind of " devices and methods therefor of measuring vehicle toxic emission amount ", its mainly comprise an exhaust gas entrance that is used to collect vehicle exhaust, and the tubaeform diluent air inlet that is connected with exhaust gas entrance, be used to measure the concentration of waste gas before the dilution first analyzer, be used to measure second analyzer of the exhaust gas concentration after the dilution and be used to measure flowmeter that dilutes exhaust gas flow and the computing machine that is used for the analyzing and processing measurement result.Because this measurement mechanism is to adopt electrochemical sensor to measure in tubaeform diluent air inlet to obtain O ₂Concentration calculate the quality of this motor vehicle actual discharge pollutant, because electrochemical sensor exists poor stability and repeatability problem such as bad, the result who makes its meter calculate can not reflect the gross mass of the actual discharge pollutant of tested motor vehicle exactly again.Therefore, this measurement mechanism and measuring method exist that measuring result error is big, degree of accuracy is low, reliable and stable performance is poor, can't reflect the problems such as actual blowdown flow rate of tested motor vehicle exactly.

Summary of the invention

The objective of the invention is to solve above-mentioned existing problems, provide a kind of utilization measurement to calculate CO in the automobile exhausting ₂Dilution ratio and carry out the total amount that the metering computer motor-car discharges pollutants, and can measure the measurement mechanism and the method thereof of pollutant of the motor vehicle actual discharge of various different displacements accurately and effectively.

On this basis, further aim of the present invention is to provide a kind of reliable operation, good stability and good reproducibility, and measurement result is accurate, precision is high utilizes infrared C O ₂Concentration sensor carries out the measurement mechanism and the method thereof of concentration determination.

Technical scheme of the present invention is achieved in that

A kind of measurement mechanism of motor vehicle emission pollutant total amount, comprise flow measurement treating apparatus, gas analysis platform, electronic analysis treating apparatus, chassis dynamometer and be connected with the flow measurement treating apparatus be connected with blower fan with the direct sample pipe of bell-mouthed dilution stopple coupon, the band sampling probe that is connected with the gas analysis platform and be connected in data line between flow measurement treating apparatus, gas analysis platform and the electronic analysis treating apparatus, its characteristics be described flow measurement treating apparatus by in regular turn with dilute the CO that stopple coupon links to each other ₂Apparatus for measuring concentration, temperature measuring equipment, device for pressure measurement and flow measurement device are formed, and wherein, described flow measurement treating apparatus is by its CO ₂Apparatus for measuring concentration, temperature measuring equipment, device for pressure measurement and flow measurement device measure the CO of the automobile exhausting after dilution respectively ₂Concentration, temperature, pressure, the data of flow, and each data that will record are sent in the electronic analysis treating apparatus through data line; Described gas analysis platform measures HC, CO, NO, the CO of automobile exhausting by sampling probe ₂Concentration and the data of pressure, temperature, flow, and each data that will record are sent in the electronic analysis treating apparatus through data line respectively; Described electronic analysis treating apparatus is analyzed the total amount of handling the actual discharge pollutant that obtains motor vehicle by the data of data that the flow measurement treating apparatus is recorded and gas analysis platform measuring; The input end of described sampling probe is positioned at the gas outlet pipe of motor vehicle.

In order further to guarantee reliable operation of the present invention, good stability and good reproducibility, and measurement result is more accurate, precision is higher, above-mentioned CO ₂The concentration sensing device is by the infrared C O that is linked in sequence ₂Concentration sensor and electrical signal conversion mechanism form.

In automobile exhausting, contain moisture content destruction gas analysis platform property, guarantee that the gas analysis platform can provide accurately errorless measurement data for the electronic analysis treating apparatus, thereby further improve the reliable and stable of the degree of accuracy of measurement result of the present invention and serviceability again, be provided with the separator that is used for filtering out the moisture content that exhaust contains between above-mentioned gas analysis platform and the direct sample pipe.

The present invention also provides a kind of measuring method of utilizing above-mentioned measurement mechanism to measure the motor vehicle emission pollutant total amount, and it comprises the steps:

(1) sampling probe is extended the sample gas that directly extracts automobile exhausting in the gas outlet pipe of motor vehicle, and the sample pneumatic transmission that extraction is obtained is to the gas analysis platform;

To dilute the air of the hydraucone of stopple coupon, and the gas that extraction obtains is delivered to the flow measurement treating apparatus over against the extraction whole exhausts of motor vehicle of the gas outlet mouth of pipe and the participation dilution of motor vehicle;

(2) through the gas analysis platform automobile exhausting that sampling probe extracts is carried out HC, CO, NO, the CO that analyzing and processing obtains automobile exhausting ₂Concentration and pressure, temperature, flow, and deliver to the electronic analysis treating apparatus by data line;

CO through the flow measurement treating apparatus ₂Apparatus for measuring concentration, temperature measuring equipment, device for pressure measurement and flow measurement device record the CO of the automobile exhausting after dilution respectively ₂Concentration, temperature, pressure, flow, and deliver to the electronic analysis treating apparatus by data line;

(3) electronic analysis treating apparatus each data that gas analysis platform, flow measurement treating apparatus are sent compare and carry out analyzing and processing, and it comprises following analyzing and processing process:

(3-1) CO in the diluents that the flow measurement treating apparatus is recorded ₂Percent concentration and the automobile exhausting that records of gas analysis platform in CO ₂Percent concentration in conjunction with obtaining CO ₂Dilution ratio; At this moment, CO ₂Dilution ratio R equal and will record airborne CO ₂Percent concentration C _Back, participate in the flow Q of diluent air _Back, the automobile exhausting that records of gas analysis platform flow Q _Raw, the diluted exhaust that records of flow measurement treating apparatus flow Q _TotalObtain the dilution ratio R of the automobile exhausting after dilution by following formula to calculating:

∵C _Raw*Q _Raw+C _Back*Q _Back＝C _Dil*(Q _Raw+Q _Back)

(C _Raw-C _Dil)*Q _Raw＝(C _Dil-C _Back)*Q _Back

$\frac{Q_{\mathrm{Back}}}{Q_{\mathrm{Raw}}}=\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}-C_{\mathrm{Back}}}\≈\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}}$

∵ again

$R^{\′}=\frac{Q_{\mathrm{Raw}}}{Q_{\mathrm{Total}}}=\frac{Q_{\mathrm{Raw}}}{Q_{\mathrm{Raw}}+Q_{\mathrm{Back}}}$

$=\frac{1}{1+\frac{Q_{\mathrm{Back}}}{Q_{\mathrm{Raw}}}}$

$=\frac{1}{1+\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}}};$

$=\frac{C_{\mathrm{Dil}}}{C_{\mathrm{Raw}}}=R$

(3-2) pressure of the diluents that the flow measurement treating apparatus is recorded, flow, temperature combine the flow that obtains diluted exhaust under the standard state with temperature under standard atmospheric pressure, the standard state; At this moment, the flow Q of automobile dilution under the standard state _SBe to calculate by following formula:

$Q_S=Q*\frac{P}{P_0}*\frac{T_0}{T+T_0};$

In the formula, the standard atmospheric pressure P of unit ₀Be the temperature T under 1013.25mBar, the unit standard state ₀Be 273.15 ° of K;

(3-3) flow of being shunted by the gas analysis platform that records with the flow of diluted exhaust under the standard state that obtains, with the gas analysis platform and the pressure that records with the gas analysis platform, temperature combine the flow that obtains automobile exhausting under the standard state with temperature under standard atmospheric pressure, the standard state; At this moment, the flow Q of automobile exhausting under the standard state _SEBe to calculate by following formula:

$Q_{\mathrm{SE}}=Q_S*R+Q_P*\frac{P^{\′}}{P_0}*\frac{T_0}{T^{\′}+T_0}.$

In the formula, the standard atmospheric pressure P of unit ₀Be the temperature T under 1013.25mBar, the unit standard state ₀Be 273.15 ° of K;

(3-4) ppm and CO or the CO of HC in the automobile exhausting that the gas analysis platform is recorded or NO ₂Percent concentration respectively with standard state under flow, HC, NO in the automobile exhausting, CO, the CO of automobile exhausting ₂The gram molecular volume of gram molecular weight, ideal gas and conversion factor in conjunction with obtaining HC, NO, CO, CO respectively ₂The quality of unit interval; At this moment, HC, the quality m of NO unit interval _iBe to calculate by following formula:

$m_i=\frac{C*{10}^{-6}*\frac{Q_{\mathrm{SE}}*{10}^3}{K_1}*\mathrm{mol}*{10}^3}{K_2}=\frac{C*Q_{\mathrm{SE}}*\mathrm{mol}}{K_1*K_2}$

In the formula, the gram molecular weight mol of HC or NO in the automobile exhausting, unit: gram, HC:86 gram, NO:30 gram; The gram molecular volume K of ideal gas ₁, unit: liter/grammol, 22.4136 liters/grammol; Conversion factor K ₂, unit: second/minute, 60 seconds/minute;

CO, CO ₂The quality m of unit interval _iBe to calculate by following formula:

$m_i=\frac{C^{\′}*{10}^{-2}*\frac{Q_{\mathrm{SE}}*{10}^3}{K_1}*\mathrm{mol}*{10}^3}{K_2}=\frac{C^{\′}*Q_{\mathrm{SE}}*\mathrm{mol}*{10}^4}{K_1*K_2}$

In the formula, CO or CO in the automobile exhausting ₂Gram molecular weight mol, unit: gram, CO:28 gram, CO ₂: 44 grams; The gram molecular volume K of ideal gas ₁, unit: liter/grammol, 22.4136 liters/grammol; Conversion factor K ₂, unit: second/minute, 60 seconds/minute;

(3-5) quality of motor vehicle unit interval exhaust is added up obtain the total amount of certain pollutant that motor vehicle discharged in the time at 0～t; At this moment, the total amount M of certain pollutant of vehicular emission _TotalBe to calculate by following formula:

$M_{\mathrm{Total}}=\underset{i=0}{\overset{t}{\mathrm{\Σ}}}\left(m_i\right)i.$

The present invention is owing to utilize the CO of measuring machine motor vehicle exhaust ₂The CO of concentration and the automobile exhausting after dilution ₂Concentration compares in conjunction with measuring the measurement mechanism of motor vehicle emission pollutant total amount and the method for measurement thereof, makes the present invention effectively utilize CO ₂The stability of measurement of concetration and the characteristics of high conformity calculate CO in the automobile exhausting by measurement ₂Dilution ratio and temperature, pressure, flow and HC, CO, NO, CO by measuring automobile exhausting ₂Concentration and make things convenient for, feasible the total amount that calculates motor vehicle actual discharge pollutant, can not only measure the pollutant of the motor vehicle actual discharge of various different displacements accurately and effectively, and measurement result is accurate, precision is high, cost performance is high.And, owing to also utilize infrared C O ₂Concentration sensor is as CO ₂The measurement mechanism of concentration determination and the method for measurement, make the present invention make full use of infrared C O ₂The characteristics of the reliable operation of concentration sensor, good stability and good reproducibility, measurement result of the present invention is more accurate, precision is higher thereby further make.

The present invention is further illustrated below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is the composition structural representation of measurement mechanism of the present invention.

Fig. 2 is an analyzing and processing functional-block diagram of the present invention.

Embodiment

As shown in Figure 1, the present invention includes flow measurement treating apparatus 1, gas analysis platform 2, electronic analysis treating apparatus 3, chassis dynamometer 4 and the direct sample pipe 7 of the dilution stopple coupon 6 of the band hydraucone 61 that is connected with blower fan 5 that is connected with flow measurement treating apparatus 1, the band sampling probe 8 that is connected with gas analysis platform 2 and be connected in data line 9 between flow measurement treating apparatus 1, gas analysis platform 2 and the electronic analysis treating apparatus 3.Existing for effectively solving existing measurement mechanism and measuring method: the actual discharge pollutant that measuring result error is big, can not reflect the motor vehicle of various different displacements exactly, problems such as measuring accuracy is low, poor stability, poor repeatability, poor reliability, flow measurement treating apparatus 1 of the present invention is by the CO that links to each other with dilution stopple coupon 6 in regular turn ₂Apparatus for measuring concentration 11, temperature measuring equipment 12, device for pressure measurement 13 and flow measurement device 14 are formed, and wherein, described flow measurement treating apparatus 1 is by its CO ₂Apparatus for measuring concentration 11, temperature measuring equipment 12, device for pressure measurement 13 and flow measurement device 14 measure the CO of the automobile exhausting after dilution respectively ₂Concentration, temperature, pressure, the data of flow, and each data that will record are sent in the electronic analysis treating apparatus 3 through data line 9; Described gas analysis platform 2 measures HC, CO, NO, the CO of automobile exhausting by sampling probe 8 ₂Concentration and the data of pressure, temperature, flow, and each data that will record are sent in the electronic analysis treating apparatus 3 through data line 9 respectively; The data that described electronic analysis treating apparatus 3 is measured by data that flow measurement treating apparatus 1 is recorded and gas analysis platform 2 are analyzed the total amount of handling the actual discharge pollutant that obtains motor vehicle.Make the present invention effectively utilize CO ₂The stability of measurement of concetration and the characteristics of high conformity calculate CO in the automobile exhausting by measurement ₂Dilution ratio and temperature, pressure, flow and HC, CO, NO, CO by measuring automobile exhausting ₂Concentration and make things convenient for, feasible the total amount that calculates motor vehicle actual discharge pollutant, can not only measure the pollutant of the motor vehicle actual discharge of various different displacements accurately and effectively, and measurement result is accurate, precision is high, cost performance is high.For guaranteeing the accurate of measurement structure, as shown in Figure 1, the input end of described sampling probe 8 is positioned at gas outlet 20 pipes of motor vehicle.In order further to guarantee reliable operation of the present invention, good stability and good reproducibility, and measurement result is more accurate, precision is higher, above-mentioned CO ₂Apparatus for measuring concentration 11 is by the infrared C O that is linked in sequence ₂Concentration sensor and electrical signal conversion mechanism form.Make the present invention make full use of infrared C O ₂The characteristics of the reliable operation of concentration sensor, good stability and good reproducibility, measurement result of the present invention is more accurate, precision is higher thereby further make.Because CO ₂The infrared C O of apparatus for measuring concentration 11 ₂Concentration sensor and electrical signal conversion mechanism belong to existing known technology, so be not described further.Equally, described temperature measuring equipment 12 is made up of temperature sensor and electrical signal conversion mechanism; Described device for pressure measurement 13 is made up of pressure transducer and electrical signal conversion mechanism; Also have these measurement mechanisms such as flow measurement device 14, gas analysis platform 2, sampling probe 8 owing to the measuring equipment that all belongs in the known technology, so do not describe in detail one by one.In automobile exhausting, contain moisture content destruction gas analysis platform property, guarantee that the gas analysis platform can provide accurately errorless measurement data for the electronic analysis treating apparatus, thereby further improve the reliable and stable of the degree of accuracy of measurement result of the present invention and serviceability again, be provided with the separator 10 that is used for filtering out the moisture content that exhaust contains between above-mentioned gas analysis platform 2 and the direct sample pipe 7.

For the above-mentioned measurement mechanism of good utilisation more carries out the total amount that meter is calculated motor vehicle actual discharge pollutant, the present invention also provides a kind of measuring method of utilizing above-mentioned measurement mechanism to measure the total amount of motor vehicle emission pollutant, shown in Figure 2 as functional-block diagram, it comprises the steps:

(1) sampling probe is extended the sample gas that directly extracts automobile exhausting in the gas outlet pipe of motor vehicle, and the sample pneumatic transmission that extraction is obtained is to the gas analysis platform;

To dilute the air of the hydraucone of stopple coupon, and the gas that extraction obtains is delivered to the flow measurement treating apparatus over against the extraction whole exhausts of motor vehicle of the gas outlet mouth of pipe and the participation dilution of motor vehicle;

(2) the gas analysis platform carries out HC, CO, NO, the CO that analyzing and processing obtains automobile exhausting to the automobile exhausting that sampling probe extracts ₂Concentration and pressure, temperature, flow, and deliver to the electronic analysis treating apparatus by data line;

CO through the flow measurement treating apparatus ₂Apparatus for measuring concentration, temperature measuring equipment, device for pressure measurement and flow measurement device record the CO of the automobile exhausting after dilution respectively ₂Concentration, temperature, pressure, flow, and deliver to the electronic analysis treating apparatus by data line;

(3) electronic analysis treating apparatus each data that gas analysis platform, flow measurement treating apparatus are sent compare and carry out analyzing and processing, and it comprises following analyzing and processing process:

(3-1) CO in the diluents that the flow measurement treating apparatus is recorded ₂Percent concentration C _DilCO in the automobile exhausting that records with the gas analysis platform ₂Percent concentration C _RawIn conjunction with obtaining CO ₂Dilution ratio R, this dilution ratio R equal and will record airborne CO ₂Percent concentration C _Back, participate in the flow Q of diluent air _Back, the automobile exhausting that records of gas analysis platform flow Q _Raw, the diluted exhaust that records of flow measurement treating apparatus flow Q _TotalObtain the dilution ratio R of the automobile exhausting after dilution by following formula to calculating:

∵C _Raw*Q _Raw+C _Back*Q _Back＝C _Dil*(Q _Raw+Q _Back)

(C _Raw-C _Dil)*Q _Raw＝(C _Dil-C _Back)*Q _Back

$\frac{Q_{\mathrm{Back}}}{Q_{\mathrm{Raw}}}=\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}-C_{\mathrm{Back}}}\≈\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}}$ (common airborne CO ₂Percent concentration C _Back≈ 0.04%, can ignore.)

∵ again

$R^{\′}=\frac{Q_{\mathrm{Raw}}}{Q_{\mathrm{Total}}}=\frac{Q_{\mathrm{Raw}}}{Q_{\mathrm{Raw}}+Q_{\mathrm{Back}}}$

$=\frac{1}{1+\frac{Q_{\mathrm{Back}}}{Q_{\mathrm{Raw}}}}.$

$=\frac{1}{1+\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}}}$

$=\frac{C_{\mathrm{Dil}}}{C_{\mathrm{Raw}}}=R$

(3-2) pressure P of the diluents that the flow measurement treating apparatus is recorded, flow Q, temperature T and standard atmospheric pressure P ₀, the temperature T under the standard state ₀In conjunction with the flow Q that obtains diluted exhaust under the standard state _S, it is to calculate by following formula:

$Q_S=Q*\frac{P}{P_0}*\frac{T_0}{T+T_0};$

In the formula:

In the formula: in the formula:

Q _S--in conjunction with the flow that obtains diluted exhaust under the standard state, unit: cubic meters per minute;

The Q--flow measurement device records the flow of diluted exhaust, unit: cubic meters per minute;

The P--flow measurement device records the pressure of diluted exhaust, unit: mBar;

The T--flow measurement device records the temperature of diluted exhaust, unit: ℃;

P ₀--standard atmospheric pressure, unit: 1013.25mBar;

T ₀--the temperature under the standard state, unit: 273.15 ° of K.

(3-3) with the flow Q of diluted exhaust under the standard state that obtains _S, the flow Q that is shunted by the gas analysis platform that records with the gas analysis platform _PAnd the pressure P that records with the gas analysis platform ', temperature T ' with standard atmospheric pressure P ₀, the temperature T under the standard state ₀In conjunction with the flow Q that obtains automobile exhausting under the standard state _SE, it is to calculate by following formula:

$Q_{\mathrm{SE}}=Q_S*R+Q_P*\frac{P^{\′}}{P_0}*\frac{T_0}{T^{\′}+T_0}.$

In the formula:

Q _SE--in conjunction with the flow that obtains automobile exhausting under the standard state, unit: cubic meters per minute;

Q _S--in conjunction with the flow that obtains diluted exhaust under the standard state, unit: cubic meters per minute;

Q _P--record the flow of being shunted by the gas analysis platform with the gas analysis platform, unit: cubic meters per minute;

P '--record pressure with the gas analysis platform, unit: mBar;

T '--record temperature with the gas analysis platform, unit: ℃;

P ₀--standard atmospheric pressure, unit: 1013.25mBar;

T ₀--the temperature under the standard state, unit: 273.15 ° of K.

(3-4) ppm C and CO or the CO of HC in the automobile exhausting that the gas analysis platform is recorded or NO ₂Percent concentration C ' respectively with standard state under the flow Q of automobile exhausting _SE, HC, NO, CO, CO in the automobile exhausting ₂Gram molecular weight mol, the gram molecular volume K of ideal gas ₁And conversion factor K ₂In conjunction with obtaining HC, NO, CO, CO respectively ₂The quality m of unit interval _i

Wherein, HC, the quality m of NO unit interval _iBe to calculate by following formula:

$m_i=\frac{C*{10}^{-6}*\frac{Q_{\mathrm{SE}}*{10}^3}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="C20041005163100181.png"\; state="\{\{state\}\}">K</figure-callout>}}_1}*\mathrm{mol}*{10}^3}{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="C20041005163100181.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}=\frac{C*Q_{\mathrm{SE}}*\mathrm{<figure-callout\; id="1"\; label="mol\; K"\; filenames="C20041005163100181.png"\; state="\{\{state\}\}">mol</figure-callout>}}{K_{}}$

In the formula:

m _iThe quality of-unit interval, unit: milli Grams Per Second;

The gram molecular weight of HC or NO in the mol--automobile exhausting, unit: gram, HC:86 gram, NO:30 gram;

K ₁--the gram molecular volume of ideal gas, unit: liter/grammol, 22.4136 liters/grammol;

K ₂--conversion factor, unit: second/minute, 60 seconds/minute.

C--records HC in the automobile exhausting or the ppm of NO, unit: ppm (10 with the gas analysis platform ^-6);

Q _SE--in conjunction with the flow that obtains automobile exhausting under the standard state, unit: cubic meters per minute.

And CO, CO ₂The quality m of unit interval _iBe to calculate by following formula:

$m_i=\frac{C^{\&prime;}*{10}^{-2}*\frac{Q_{\mathrm{SE}}*{10}^3}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="C20041005163100181.png"\; state="\{\{state\}\}">K</figure-callout>}}_1}*\mathrm{mol}*{10}^3}{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="C20041005163100181.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}=\frac{C^{\&prime;}*Q_{\mathrm{SE}}*\mathrm{mol}*{10}^4}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="C20041005163100181.png"\; state="\{\{state\}\}">K</figure-callout>}}_1*{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="C20041005163100181.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}$

In the formula:

m _i--the quality of unit interval, unit: milli Grams Per Second;

CO or CO in the mol--automobile exhausting ₂Gram molecular weight, unit: gram, CO:28 gram, CO ₂: 44 grams;

K ₁--the gram molecular volume of ideal gas, unit: liter/grammol, 22.4136 liters/grammol;

K ₂--conversion factor, unit: second/minute, 60 seconds/minute.

C '--record CO or CO in the automobile exhausting with the gas analysis platform ₂Percent concentration, unit: %;

Q _SE--in conjunction with the flow that obtains automobile exhausting under the standard state, unit: cubic meters per minute.

(3-5) with the quality m of motor vehicle unit interval exhaust _iAdd up and obtain the total amount M of certain pollutant that motor vehicle discharged in the time at 0～t _Total, it is to calculate by following formula:

$M_{\mathrm{Total}}=\underset{i=0}{\overset{t}{\mathrm{\&Sigma;}}}\left(m_i\right)i.$

In the formula:

m _i--the quality of unit interval, unit: milli Grams Per Second;

M _Total--0～t is in the time, the total amount of certain pollutant that motor vehicle is discharged.

Claims (4)

1, a kind of measurement mechanism of motor vehicle emission pollutant total amount, comprise flow measurement treating apparatus (1), gas analysis platform (2), electronic analysis treating apparatus (3), chassis dynamometer (4) reaches the dilution stopple coupon (6) of the band hydraucone (61) that is connected with blower fan (5) that is connected with flow measurement treating apparatus (1), the direct sample pipe (7) of the band sampling probe (8) that is connected with gas analysis platform (2) and be connected in flow measurement treating apparatus (1), data line (9) between gas analysis platform (2) and the electronic analysis treating apparatus (3) is characterized in that described flow measurement treating apparatus (1) is by the CO that links to each other with dilution stopple coupon (6) in regular turn ₂Apparatus for measuring concentration (11), temperature measuring equipment (12), device for pressure measurement (13) and flow measurement device (14) are formed, and wherein, described flow measurement treating apparatus (1) is by its CO ₂Apparatus for measuring concentration (11), temperature measuring equipment (12), device for pressure measurement (13) and flow measurement device (14) measure the CO of the automobile exhausting after dilution respectively ₂Concentration, temperature, pressure, the data of flow, and each data that will record are sent in the electronic analysis treating apparatus (3) through data line (9); Described gas analysis platform (2) measures HC, CO, NO, the CO of automobile exhausting by sampling probe (8) ₂Concentration and the data of pressure, temperature, flow, and each data that will record are sent in the electronic analysis treating apparatus (3) through data line (9) respectively; The data that described electronic analysis treating apparatus (3) is measured by data that flow measurement treating apparatus (1) is recorded and gas analysis platform (2) are analyzed the total amount of handling the actual discharge pollutant that obtains motor vehicle; The input end of described sampling probe (8) is positioned at the gas outlet pipe of motor vehicle.

2,, it is characterized in that above-mentioned CO according to the measurement mechanism of the described motor vehicle emission pollutant total amount of claim 1 ₂Apparatus for measuring concentration (11) is by the infrared C O that is linked in sequence ₂Concentration sensor and electrical signal conversion mechanism form.

3,, it is characterized in that being provided with between above-mentioned gas analysis platform (2) and the direct sample pipe (7) separator (10) that is used for filtering out the moisture content that exhaust contains according to the measurement mechanism of the described motor vehicle emission pollutant total amount of claim 1.

4, a kind of measuring method of utilizing the described measurement mechanism of claim 1 to measure the motor vehicle emission pollutant total amount is characterized in that comprising the steps:

(1) sampling probe is extended the sample gas that directly extracts automobile exhausting in the gas outlet pipe of motor vehicle, and the sample pneumatic transmission that extraction is obtained is to the gas analysis platform;

To dilute the air of the hydraucone of stopple coupon, and the gas that extraction obtains is delivered to the flow measurement treating apparatus over against the extraction whole exhausts of motor vehicle of the gas outlet mouth of pipe and the participation dilution of motor vehicle;

(2) through the gas analysis platform automobile exhausting that sampling probe extracts is carried out HC, CO, NO, the CO that analyzing and processing obtains automobile exhausting ₂Concentration and pressure, temperature, flow, and deliver to the electronic analysis treating apparatus by data line;

CO through the flow measurement treating apparatus ₂Apparatus for measuring concentration, temperature measuring equipment, device for pressure measurement and flow measurement device record the CO of the automobile exhausting after dilution respectively ₂Concentration, temperature, pressure, flow, and deliver to the electronic analysis treating apparatus by data line;

(3) electronic analysis treating apparatus each data that gas analysis platform, flow measurement treating apparatus are sent compare and carry out analyzing and processing, and it comprises following analyzing and processing process:

(3-1) CO in the diluents that the flow measurement treating apparatus is recorded ₂Percent concentration C _DilCO in the automobile exhausting that records with the gas analysis platform ₂Percent concentration C _RawIn conjunction with obtaining CO ₂Dilution ratio R; At this moment, CO ₂Dilution ratio R equal and will record airborne CO ₂Percent concentration C _Back, participate in the flow Q of diluent air _Back, the automobile exhausting that records of gas analysis platform flow Q _Raw, the diluted exhaust that records of flow measurement treating apparatus flow Q _TotalObtain the dilution ratio R ' of the automobile exhausting after dilution by following formula to calculating:

∵C _Raw*Q _Raw+C _Back*Q _Back＝C _Dil*(Q _Raw+Q _Back)

(C _Raw-C _Dil)*Q _Raw＝(C _Dil-C _Rack)*Q _Back

$\frac{Q_{\mathrm{Back}}}{Q_{\mathrm{Raw}}}=\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}-C_{\mathrm{Back}}}\&ap;\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}}$

∵ again

$R^{\&prime;}=\frac{Q_{\mathrm{Raw}}}{Q_{\mathrm{Total}}}=\frac{Q_{\mathrm{Raw}}}{Q_{\mathrm{Raw}}+Q_{\mathrm{Back}}}$

$=\frac{1}{1+\begin{array}{c}{Q}_{\mathrm{Back}}\\ Q_{\mathrm{Raw}}\end{array}};$

$=\frac{1}{1+\frac{C_{\mathrm{Raw}}-C_{\mathrm{Dil}}}{C_{\mathrm{Dil}}}}$

$=\frac{C_{\mathrm{Dil}}}{C_{\mathrm{Raw}}}=R$

(3-2) pressure P of the diluents that the flow measurement treating apparatus is recorded, flow Q, temperature T and standard atmospheric pressure P ₀, the temperature T under the standard state ₀In conjunction with the flow Q that obtains diluted exhaust under the standard state _SAt this moment, the flow Q of automobile dilution under the standard state _SBe to calculate by following formula:

$Q_S=Q*\frac{P}{P_0}*\frac{T_0}{T+T_0};$

In the formula, the standard atmospheric pressure P of unit ₀Be the temperature T under 1013.25mBar, the unit standard state ₀Be 273.15 ° of K;

(3-3) with the flow Q of diluted exhaust under the standard state that obtains _S, the flow Q that is shunted by the gas analysis platform that records with the gas analysis platform _PAnd the pressure P that records with the gas analysis platform ', temperature T ' with standard atmospheric pressure P ₀, the temperature T under the standard state ₀In conjunction with the flow Q that obtains automobile exhausting under the standard state _SEAt this moment, the flow Q of automobile exhausting under the standard state _SEBe to calculate by following formula:

$Q_{\mathrm{SE}}=Q_S*R+Q_P*\frac{P^{\&prime;}}{P_0}*\frac{T_0}{T^{\&prime;}+T_0};$

In the formula, the standard atmospheric pressure P of unit ₀Be the temperature T under 1013.25mBar, the unit standard state ₀Be 273.15 ° of K;

(3-4) ppm C and CO or the CO of HC in the automobile exhausting that the gas analysis platform is recorded or NO ₂Percent concentration C ' respectively with standard state under the flow Q of automobile exhausting _SE, HC, NO, CO, CO in the automobile exhausting ₂Gram molecular weight mol, the gram molecular volume K of ideal gas ₁And conversion factor K ₂In conjunction with obtaining HC, NO, CO, CO respectively ₂The quality m of unit interval _tAt this moment, HC, the quality m of NO unit interval _tBe to calculate by following formula:

$m_t=\frac{C*{10}^{-6}*\frac{Q_{\mathrm{SE}}*{10}^3}{K_1}*\mathrm{mol}*{10}^3}{K_2}=\frac{C*Q_{\mathrm{SE}}*\mathrm{mol}}{K_1*K_2}$

In the formula, the gram molecular weight mol of HC or NO in the automobile exhausting, unit: gram, HC:86 gram, NO:30 gram; The gram molecular volume K of ideal gas ₁, unit: liter/grammol, 22.4136 liters/grammol; Conversion factor K ₂, unit: second/minute, 60 seconds/minute;

CO, CO ₂The quality m of unit interval _tBe to calculate by following formula:

$m_t=\frac{C^{\&prime;}*{10}^{-2}*\frac{Q_{\mathrm{SE}}*{10}^3}{K_1}*\mathrm{mol}*{10}^3}{K_2}=\frac{C^{\&prime;}*Q_{\mathrm{SE}}*\mathrm{mol}*{10}^4}{K_1*K_2}$

In the formula, CO or CO in the automobile exhausting ₂Gram molecular weight mol, unit: gram, CO:28 gram, CO ₂: 44 grams; The gram molecular volume K of ideal gas ₁, unit: liter/grammol, 22.4136 liters/grammol; Conversion factor K ₂, unit: second/minute, 60 seconds/minute;

(3-5) with the quality m of motor vehicle unit interval exhaust _tAdd up and obtain the total amount M of certain pollutant that motor vehicle discharged in the time at 0～t _TotalAt this moment, the total amount M of certain pollutant of vehicular emission _TotalBe to calculate by following formula:

$M_{\mathrm{Total}}=\underset{i=0}{\overset{t}{\mathrm{\&Sigma;}}}\left(m_t\right)i.$

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