CN104122373B - A kind of motor vehicle exhaust emission measurement apparatus and method - Google Patents
A kind of motor vehicle exhaust emission measurement apparatus and method Download PDFInfo
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- CN104122373B CN104122373B CN201410357100.XA CN201410357100A CN104122373B CN 104122373 B CN104122373 B CN 104122373B CN 201410357100 A CN201410357100 A CN 201410357100A CN 104122373 B CN104122373 B CN 104122373B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The present invention relates to a kind of motor vehicle exhaust emission measurement apparatus and method, including diluent air inlet end, dilution tunnel, engine exhaust inlet end and diluted exhaust outlet side；Diluent air inlet end, for the total flow of the content measuring gas and particulate matter in the diluent air of input the diluent air measuring input, inputs diluent air in described dilution tunnel；Engine exhaust inlet end is for inputting engine exhaust to dilution tunnel；Dilution tunnel is used for receiving diluent air and the engine exhaust of input, and mixes diluent air with engine exhaust；Diluted exhaust outlet side is used for measuring the content of gas and particulate matter in the total flow of the diluted exhaust that engine exhaust is mixed to get and diluted exhaust with diluent air, discharges diluted exhaust.The present invention is it can be avoided that the coefficient of dilution calculates error, the content of pollutant and the condensation of steam and separate out impact on emission test results in diluent air.
Description
Technical field
The present invention relates to vehicle discharge detection field, particularly to a kind of motor vehicle exhaust emission measurement apparatus and
Method.
Background technology
From the 7's of 20th century, light-duty vehicle discharge and fuel consumption measurement use operating condition method always
Carry out airbag sampling by full stream constant volume dilution sampling CVS system and obtained by theoretical calculating of Carbon balance.This
Kind Method And Principle is clear, simple in construction, has obtained the generally accreditation of automobile industry and certification authority.
In full stream constant volume dilution sampling CVS system, engine exhaust all enters mixing tee, and dilute
Release air and be mixed into the diluted exhaust of constant flow, and by a certain percentage diluted exhaust and diluent air are divided
It is not collected in sampling airbag.In diluent air, pollutant levels are low to negligible premise
Under, in sampling airbag, the ratio of diluted exhaust and exhaust contaminant total amount keeps constant.At test loop knot
Shu Hou, the concentration of each gas pollutant in measurement sampling airbag, then it is multiplied by the dilute of constant-volume sampling systematic survey
Release exhaust total measurement (volume), be i.e. the total release of each gas exhaust pollutant during measurement.
Full stream constant volume dilution sampling CVS system is the dilution sampling system of a kind of change, whole owing to dilute
Engine exhaust in individual test loop, is characterized in that extension rate is very big, and extension rate is with engine
Working conditions change and be continually changing, because the capacity that automobile is under different operating modes differs greatly, as idle
During speed, extraction flow is very little, and extraction flow sharply increases when accelerating high load capacity, and result is its dilution times
Number seems too big when idling, and seems too little under accelerating mode.
When diluted exhaust measurement result being corrected with diluent air, owing to calculating the coefficient of dilution and reality
Border extension rate there are differences, and produces theory error；
The Venturi tube flow that test uses is bigger, and the deviation calculating the coefficient of dilution with actual extension rate is got over
Greatly, the concentration calculating error of each exhaust gas composition is bigger.
In diluent air, each gas composition concentration is higher, and it is bigger that the concentration of corresponding composition calculates error；CO2
The concentration affecting all the components is calculated error by concentration error.
In engine exhaust, the theoretical exhaust concentration of CO2 deviation of concentration is more remote, and the concentration of each exhaust gas composition calculates
Error is bigger.
Vapour content change in engine exhaust directly affects CO2 concentration measurement.
It is also only limited to solve pollutant in diluent air to the improvement of Full flow dilution constant-volume sampling system at present
Problem is affected on test result, is the refined system of background air of Ku Chang company of Japan than more typical scheme
System and the part diluted stream sampling system of AVL company of Austria.In background air refining system scheme,
By the catalyst converter in system, the concentration of HC, CO and NOx in diluent air is reduced to negligible
Degree reduces interference；In part diluted stream sampling system scheme, by using zero air or pure nitrogen gas
Minimum scale dilution is carried out to partial engine exhaust and solves background air interference.
Content of the invention
The technical problem to be solved is to provide one it can be avoided that the coefficient of dilution calculates error, dilute
Release the condensation of steam in the content of pollutants in air and engine exhaust and emission testing is tied by precipitation
The motor vehicle exhaust emission measurement apparatus of the impact of fruit and method.
The technical scheme is that a kind of motor vehicle exhaust emission measurement dress
Put, including diluent air inlet end, dilution tunnel, engine exhaust inlet end and diluted exhaust outlet side；
Described diluent air inlet end, for measuring the content of gas and particulate matter in the diluent air of input
And measure the total flow of the diluent air of input, send into diluent air in described dilution tunnel afterwards；
Described engine exhaust inlet end, for inputting dilution tunnel by engine exhaust；
Described dilution tunnel, is used for receiving diluent air and the engine exhaust of input, and by diluent air
Mix with engine exhaust；
Described diluted exhaust outlet side, for measuring the dilution that engine exhaust is mixed to get with diluent air
The content of gas and particulate matter in the total flow of exhaust and diluted exhaust, and diluted exhaust is discharged；Dilute
Release exhaust outlet side and use the equipment of measurement water vapour content, for the water vapour content school of analyzer
Just.
The invention has the beneficial effects as follows: the present invention is it can be avoided that the coefficient of dilution calculates error, in diluent air
The condensation of steam and the impact on emission test results for the precipitation in the content of pollutant and engine exhaust.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described diluent air inlet end includes air filter, and inlet end gas and particulate matter are adopted
Sample unit, flowmeter；
Described air filter, is arranged at the stem of dilution tunnel, for filtering the dust in diluent air；
Described inlet end gas and particle sampling unit, be arranged at the logical with dilution of air filter rear portion
Road be connected branch road on, for take out in the diluent air through air filter a small amount of diluent air with
Measure the content of wherein gas and particulate matter；
Described flowmeter, is arranged at the dilution at the rear portion of inlet end gas particles thing sampling unit place branch road
It on passage, is used for measuring the flow of the diluent air in the dilution tunnel of current location.
Further, described inlet end gas and particle sampling unit include that diluent air particle sampling is filtered
Paper, diluent air particle sampling pump and diluent air gas samping pump；
Described diluent air particle sampling filter paper is arranged at diluent air particle sampling pump and dilutes
On the same branch road that passage is connected, diluent air particle sampling filter paper is used for measuring particle in diluent air
The quality of thing, described diluent air particle sampling pump is for controlling the flow of the diluent air of this branch road；
Described diluent air gas samping pump, is arranged on another branch road connecting with dilution tunnel, tail end
Connect sampling airbag, for controlling the flow of the diluent air entering sampling airbag.
Further, described engine exhaust inlet end includes engine exhaust sampling pipe, and described engine is arranged
Gas sampling pipe is for inputting dilution tunnel by engine exhaust.
Further, described engine exhaust inlet end also includes engine exhaust sampling rubber gum cover, described
Engine exhaust sampling rubber gum cover is for forming the exhaust pipe of engine with engine exhaust sampling pipe close
Envelope passage.
Further, described diluted exhaust outlet side includes outlet side gas and particle sampling unit, literary composition mound
In pipe and air exhauster；
Described outlet side gas and particle sampling unit, be arranged at described engine exhaust inlet end rear portion
On the branch road being connected with dilution tunnel, for the diluted exhaust in dilution tunnel takes out a small amount of dilution row
Gas is to measure the content of wherein gas and particulate matter；
Described Venturi tube, is arranged at the dilution at the rear portion of described outlet side gas and particle sampling unit
On passage, for gathering the total flow of diluted exhaust in the dilution tunnel of current location；
Described air exhauster, is arranged at the tail end of dilution tunnel, for discharging the dilution row in dilution tunnel
Gas.
Further, gas and particle sampling unit include diluted exhaust particle sampling filter paper, dilution row
Aerated particle thing sampling pump and diluted exhaust gas samping pump；
Described diluted exhaust particle sampling filter paper is arranged at diluted exhaust particle sampling pump and dilutes
On the same branch road of channel connection, diluted exhaust particle sampling filter paper is used for measuring particle in diluted exhaust
The quality of thing, described diluted exhaust particle sampling pump is for controlling the flow of the diluted exhaust of this branch road.
Described diluted exhaust gas samping pump, is arranged on another branch road connecting with dilution tunnel, tail end
Connect sampling airbag, for controlling the flow of the diluted exhaust entering sampling airbag.
A kind of measuring method utilizing motor vehicle exhaust emission measurement apparatus to carry out motor vehicle exhaust emission, including with
Lower step:
Step 1: utilize the matter of gas and particulate matter in the diluent air of diluent air inlet end measurement input
Measure and measure the total flow of the diluent air of input, send into diluent air in described dilution tunnel afterwards；
Step 2: engine exhaust is inputted dilution tunnel by engine exhaust inlet end, diluent air with send out
Motivation exhaust mixes in dilution tunnel；
Step 3: at diluted exhaust outlet side measurement water vapour content and the water vapour content of analyzer is entered
Row correction；The diluted exhaust that diluted exhaust outlet side measurement engine exhaust is mixed to get with diluent air
The content of gas and particulate matter in total flow and diluted exhaust, and diluted exhaust is discharged；
Step 4: the content according to gas in diluent air and particulate matter, total stream of the diluent air of input
In amount, the total flow of diluted exhaust and diluted exhaust, the quality of gas particles thing, obtains in engine exhaust
Gas and the quality of Particulate Pollution thing.
Further, the content according to gas in diluent air and particulate matter in described step 4, input dilute
Release the quality of gas particles thing in the total flow of air, the total flow of diluted exhaust and diluted exhaust, obtain
The quality of the gas in engine exhaust and Particulate Pollution thing farther includes:
Step 4.1: content according to gas in diluent air and particulate matter and the diluent air of input total
Flow obtains the quality of gas and particulate matter in diluent air；
Step 4.2: in total flow according to diluted exhaust and diluted exhaust, the content of gas and particulate matter obtains
The quality of gas and particulate matter in diluted exhaust；
Step 4.3: by the quality of gas in diluted exhaust and particulate matter and gas and particle in diluent air
The quality of thing does difference respectively, obtains the gas in engine exhaust and the quality of Particulate Pollution thing.
Further, described step 4.1 is specifically, utilize diluent air particle sampling filter paper measurement to obtain
Diluent air in the quality of particulate matter, the stream flowing through the diluent air of diluent air particle sampling pump
Amount, through the flow of diluent air gas samping pump input sample airbag and the content of wherein gas and flowmeter
The total flow of the diluent gas that measurement obtains, calculates the matter of gas and particulate matter in described diluent air
Amount；
Described step 4.2 is specifically, utilize the dilution row that diluted exhaust particle sampling filter paper measurement obtains
The quality of particulate matter, the stream flowing through the diluted exhaust of this branch road of diluted exhaust particle sampling pump in gas
Amount, through the flow of diluted exhaust gas samping pump input sample airbag and the content of wherein gas and venturi
The total flow of the diluted exhaust that pipe measurement obtains, calculates gas and particulate matter in described diluted exhaust
Quality.
Brief description
Fig. 1 is gas circuit connection structure schematic diagram of the present invention；
Fig. 2 is present configuration figure.
In accompanying drawing, the list of parts representated by each label is as follows:
1st, diluent air inlet end, 1-1, air filter, 1-2, inlet end gas and particulate matter are adopted
Sample unit, 1-2.1, diluent air particle sampling filter paper, 1-2.2, diluent air particle sampling pump,
1-2.3, diluent air gas samping pump, 1-3, flowmeter, the 2nd, dilution tunnel, the 3rd, engine exhaust
Inlet end, 3-1, engine exhaust sampling pipe, 3-2, engine exhaust sampling rubber gum cover are the 4th, dilute
Release exhaust outlet side, 4-1, outlet side gas and particle sampling unit, 4-1.1, diluted exhaust particle
Thing sampling filter paper, 4-1.2, diluted exhaust particle sampling pump, 4-1.3, diluted exhaust gas samping pump,
4-2, Venturi tube, 4-3, air exhauster.
Detailed description of the invention
Being described below in conjunction with principle and feature to the present invention for the accompanying drawing, example is served only for explaining this
Invention, is not intended to limit the scope of the present invention.
Fig. 1 is for gas circuit connection structure schematic diagram of the present invention；Fig. 2 is present configuration figure.
Embodiment 1
A kind of motor vehicle exhaust emission measurement apparatus, including diluent air inlet end 1, dilution tunnel 2, sends out
Motivation exhaust inlet end 3 and diluted exhaust outlet side 4；
Described diluent air inlet end 1, for measuring the matter of gas and particulate matter in the diluent air of input
Measure and measure the total flow of the diluent air of input, afterwards diluent air is sent in described dilution tunnel 2；
Described dilution tunnel 2, is used for receiving input diluent air and engine exhaust, and by diluent air
Mix with engine exhaust；
Described engine exhaust inlet end 3, for inputting engine exhaust to dilution tunnel 2；
Described diluted exhaust outlet side 4 is dilute with what diluent air was mixed to get for measuring engine exhaust
Release the quality of gas and particulate matter in the total flow of exhaust and diluted exhaust, and diluted exhaust is discharged.
Described diluent air inlet end 1 includes air filter 1-1, inlet end gas and particle sampling
Unit 1-2, flowmeter 1-3；
Described air filter 1-1, is arranged at the stem of dilution tunnel, for filtering in diluent air
Dust；
Described inlet end gas and particle sampling unit 1-2, be arranged at the dilute of air filter 1 rear portion
Release on the branch road of passage, for taking out a small amount of dilution sky in the diluent air through air filter 1-1
Gas is to measure the content of wherein gas and particulate matter；
Described flowmeter 1-3, is arranged at inlet end gas and particle sampling unit 1-2 place branch road
It on the dilution tunnel at rear portion, is used for measuring the flow of the diluent air in the dilution tunnel of current location.
Described inlet end gas and particle sampling unit 1-2 include diluent air particle sampling filter paper
1-2.1, diluent air particle sampling pump 1-2.2 and diluent air gas samping pump 1-2.3；
Described diluent air particle sampling filter paper 1-2.1 and diluent air particle sampling pump 1-2.2 sets
Being placed on the same branch road connecting with dilution tunnel 2, diluent air particle sampling filter paper 1-2.1 is used for
The quality of particulate matter in measurement diluent air, described diluent air particle sampling pump 1-2.2 is used for controlling
The flow of the diluent air of this branch road；
Described diluent air gas samping pump 1-2.3, is arranged at another branch road connecting with dilution tunnel 2
On, tail end connects sampling airbag, for controlling the flow of the diluent air entering sampling airbag.
Described engine exhaust inlet end 3 includes engine exhaust sampling pipe 3-1, described engine exhaust
Sampling pipe is for inputting dilution tunnel 2 by engine exhaust.
Described engine exhaust inlet end 3 also include engine exhaust sampling rubber gum cover 3-2, described
Motivation exhaust sampling rubber gum cover 3-2 is for forming the exhaust pipe of engine with engine exhaust sampling pipe close
Envelope passage.
Described diluted exhaust outlet side 4 includes outlet side gas and particle sampling unit 4-1, venturi
Pipe 4-2 and air exhauster 4-3；
Described outlet side gas and particle sampling unit 4-1, be arranged at described engine exhaust inlet end
On the branch road at the rear portion of 3, for diluted exhaust in dilution tunnel 2 takes out a small amount of diluted exhaust with
Measure the content of wherein gas and particulate matter；
Described Venturi tube 4-2, after being arranged at described outlet side gas and particle sampling unit 4-1
On the dilution tunnel in portion, for gathering the total flow of diluted exhaust in the dilution tunnel of current location.
Described air exhauster 4-3, is arranged at the tail end of dilution tunnel 2, is used for discharging in dilution tunnel 2
Diluted exhaust.
Outlet side gas and particle sampling unit 4-1 include diluted exhaust particle sampling filter paper
4-1.1, diluted exhaust particle sampling pump 4-1.2 and diluted exhaust gas samping pump 4-1.3；
Described diluted exhaust particle sampling filter paper 4-1.1, with diluted exhaust particle sampling pump 4-1.2
It is arranged on same branch road, for measuring the dilution that this branch road is flow through in particulate matter quality control in this branch road
The flow of exhaust；
Described diluted exhaust gas samping pump 4-1.3, is arranged at another branch road connecting with dilution tunnel 2
On, tail end connects sampling airbag, for controlling the flow of the diluted exhaust entering sampling airbag.
A kind of measuring method utilizing motor vehicle exhaust emission measurement apparatus to carry out motor vehicle exhaust emission, including with
Lower step:
Step 1: utilize the containing of gas particles thing in the diluent air of diluent air inlet end 1 measurement input
Measure and measure the total flow of the diluent air of input, afterwards diluent air is sent in described dilution tunnel 2；
Step 2: engine exhaust is inputted dilution tunnel 2, diluent air by engine exhaust inlet end 3
Mix in dilution tunnel 2 with having started exhaust；
Step 3: diluted exhaust outlet side 4 measures the dilution that engine exhaust is mixed to get with diluent air
The content of gas and particulate matter in the total flow of exhaust and diluted exhaust, and diluted exhaust is discharged；
Step 4: the content according to gas in diluent air and particulate matter, total stream of the diluent air of input
In amount, the total flow of diluted exhaust and diluted exhaust, the content of gas and particulate matter, obtains engine exhaust
In gas and the quality of Particulate Pollution thing.
The diluent air of the content according to gas in diluent air and particulate matter, input in described step 4
In total flow, the total flow of diluted exhaust and diluted exhaust, the content of gas and particulate matter, obtains engine
The quality of the gas in exhaust and Particulate Pollution thing farther includes:
Step 4.1: content according to gas in diluent air and particulate matter and the diluent air of input total
Flow obtains the quality of gas and particulate matter in diluent air；
Step 4.2: in total flow according to diluted exhaust and diluted exhaust, the content of gas and particulate matter obtains
The quality of gas and particulate matter in diluted exhaust；
Step 4.3: by the quality of gas in diluted exhaust and particulate matter and gas and particle in diluent air
The quality of thing does difference respectively, obtains the quality of gas and Particulate Pollution thing in engine exhaust.
Described step 4.1 is specifically, utilize diluent air particle sampling filter paper 1-2.1 measurement to obtain
In diluent air, quality, the described dilution flowing through diluent air particle sampling pump 1-2.2 of particulate matter are empty
The flow of gas, flow and wherein gas through diluent air gas samping pump 1-2.3 input sample airbag
The total flow of the diluent gas that content and flowmeter 1-3 measurement obtain, calculates in described diluent air
Gas and the quality of particulate matter；
Described step 4.2 is specifically, utilize diluted exhaust particle sampling filter paper 4-1.1 measurement to obtain
The quality of particulate matter, described this branch road flowing through diluted exhaust particle sampling pump 4-1.2 in diluted exhaust
Diluted exhaust flow, through the flow of diluted exhaust gas samping pump 4-1.3 input sample airbag and its
The total flow of the diluted exhaust that the content of middle gas and the measurement of Venturi tube 4-2 obtain, calculates described
The quality of gas and particulate matter in diluted exhaust.
This flowmeter can be laminar flow flowmeter or orifice-plate flowmeter, and uses rapid-action sensor.
In order to reduce the impact on measuring accuracy for the gas flow fluctuations, the range of flow of this gas flowmeter is at least etc.
Flow in Venturi tube.In order to avoid the condensation of steam, choose the bigger Venturi tube of flow.For
Reduce the impact on diluent air total flow for the sampling air flow, the gas of diluent air inlet end and particulate matter
The sampled point of sampling unit should be positioned between air filter and flowmeter, and sampling flow should be stablized, dilution
The total flow of air is unrelated with the flow taken away at sampling probe, in diluent air each pollutant concentration with
Sampled concentrations is consistent.In order to avoid the leakage of the exhaust pipe of engine and sampling pipe junction, this junction should
Using rubber gum cover to seal, this rubber gum cover should be high temperature resistant, and hydrocarbon grade toxic gas can not be had during high temperature to release
Put, it is impossible to have bulk and powder to come off, burning more can not be had to melt phenomenon.In order to reduce in engine exhaust
The condensation of steam, engine exhaust sampling pipe should be as far as possible short, and has enough temperature.
Owing to condensation and the filter paper of steam in gas sampling unit separate out, should make at diluted exhaust outlet side
With the equipment of measurement water vapour content, for the water vapour content correction of analyzer.
Diluent air removes the foreign matter such as dust through air filter, and air-flow known to sub-fraction flow is by dilute
Release air particle sampling pump to discharge through diluent air particle sampling filter paper, by weighing particle sampling
The mass change of filter paper calculates particle sampling quality, and known to sub-fraction flow, air-flow is through diluent air
Gas samping pump be filled with diluent air sampling airbag for calculating the content of gas pollutant in diluent air,
The overwhelming majority flow through flowmeter enter dilution tunnel, during flowing through flowmeter gather data by based on
Calculate the total flow of diluent air, particle sampling quality, gas content and total flow can be drawn dilution sky
The quality of particulate matter and gas pollutant in gas.
The exhaust pipe of engine consists of with engine exhaust sampling pipe engine exhaust sampling rubber gum cover
Sealing passage, engine exhaust enters dilution tunnel through this passage.
Engine exhaust mixes formation diluted exhaust with diluent air in dilution tunnel.
At the afterbody of dilution tunnel, diluted exhaust known to sub-fraction flow is adopted by diluted exhaust particulate matter
Sample pump is discharged through diluent air particle sampling filter paper, by weighing the mass change of particle sampling filter paper
Calculating particle sampling quality, known to sub-fraction flow, diluted exhaust is through diluted exhaust gas samping pump
Be filled with diluted exhaust sampling airbag for calculating the content of gas pollutant in diluted exhaust, the overwhelming majority dilute
Release exhaust flow through venturi to be discharged by air exhauster, gather data when flowing through Venturi tube dilute for calculating
Release the total flow of exhaust, can be drawn in diluted exhaust by particle sampling quality, gas content and total flow
Particulate matter and the quality of gas pollutant.
Diluted exhaust is pollutant in engine exhaust with the difference of pollutant quality in diluent air
Quality.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (7)
1. a motor vehicle exhaust emission measurement apparatus, it is characterised in that: include diluent air inlet end (1),
Dilution tunnel (2), engine exhaust inlet end (3) and diluted exhaust outlet side (4)；
Described diluent air inlet end (1), for measuring gas and particulate matter in the diluent air of input
Content and the total flow of diluent air measuring input, afterwards diluent air is inputted described dilution tunnel
(2) in；
Described dilution tunnel (2), for receiving diluent air and the engine exhaust of input, and by dilute
Release air to mix with engine exhaust；
Described engine exhaust inlet end (3), for inputting engine exhaust to dilution tunnel (2)；
Described diluted exhaust outlet side (4), is used for measuring engine exhaust and is mixed to get with diluent air
The total flow of diluted exhaust and diluted exhaust in the content of gas and particulate matter, and diluted exhaust is arranged
Go out；Use the equipment of measurement water vapour content at diluted exhaust outlet side (4), for analyzer
Water vapour content corrects；
Described diluent air inlet end (1) includes air filter (1-1), inlet end gas and particle
Thing sampling unit (1-2) and flowmeter (1-3)；
Described air filter (1-1), is arranged at the stem of dilution tunnel, is used for filtering diluent air
In dust；
Described inlet end gas and particle sampling unit (1-2), be arranged at air filter (1-1)
On the branch road being connected with dilution tunnel at rear portion, at the dilution sky through air filter (1-1)
The flow taking out a small amount of diluent air in gas to measure the content of wherein gas and particulate matter and control sampling；
Described flowmeter (1-3), is arranged at inlet end gas and particle sampling unit (1-2) place
It on the dilution tunnel at the rear portion of branch road, is used for measuring the stream of the diluted exhaust in the dilution tunnel of current location
Amount；
Described inlet end gas and particle sampling unit (1-2) include that diluent air particle sampling is filtered
Paper (1-2.1), diluent air particle sampling pump (1-2.2) and diluent air gas samping pump (1-2.3)；
Described diluent air particle sampling filter paper (1-2.1) and diluent air particle sampling pump
(1-2.2) it is arranged on the same branch road connecting with dilution tunnel (2), diluent air particle sampling
Filter paper (1-2.1) is for measuring the quality of particulate matter in this branch road diluent air, described diluent air
Grain thing sampling pump (1-2.2) is for controlling the flow of the diluent air of this branch road；
Described diluent air gas samping pump (1-2.3), is arranged at another with what dilution tunnel (2) connected
On one branch road, tail end connects sampling airbag, for controlling the flow of the diluent air entering sampling airbag.
2. motor vehicle exhaust emission measurement apparatus according to claim 1, it is characterised in that: described
Engine exhaust inlet end (3) includes engine exhaust sampling pipe (3-1), and described engine exhaust is adopted
Sample pipe for inputting dilution tunnel (2) by engine exhaust.
3. motor vehicle exhaust emission measurement apparatus according to claim 2, it is characterised in that: described
Engine exhaust inlet end (3) also includes engine exhaust sampling rubber gum cover (3-2), described starts
Machine exhaust sampling rubber gum cover (3-2) is for by the exhaust pipe of engine and engine exhaust sampling pipe (3-1)
Composition seals passage.
4. motor vehicle exhaust emission measurement apparatus according to claim 1, it is characterised in that: described
Diluted exhaust outlet side (4) includes outlet side gas and particle sampling unit (4-1), Venturi tube
(4-2) with air exhauster (4-3)；
Described outlet side gas and particle sampling unit (4-1), be arranged at described engine exhaust and enter
On the branch road that the rear portion of gas end (3) is connected with dilution tunnel (2), in dilution tunnel (2)
Diluted exhaust in take out a small amount of diluted exhaust and measure to carry out gas and particle content and control sampling
Flow；
Described Venturi tube (4-2), is arranged at described outlet side gas and particle sampling unit (4-1)
Rear portion dilution tunnel on, for gathering the total flow of diluted exhaust in the dilution tunnel of current location；
Described air exhauster (4-3), is arranged at the tail end of dilution tunnel (2), is used for discharging dilution logical
Diluted exhaust in road (2).
5. motor vehicle exhaust emission measurement apparatus according to claim 4, it is characterised in that: gas
Sampling unit (4-1) includes diluted exhaust particle sampling filter paper (4-1.1), diluted exhaust particulate matter
Sampling pump (4-1.2) and diluted exhaust gas samping pump (4-1.3)；
Described diluted exhaust particle sampling filter paper (4-1.1), with diluted exhaust particle sampling pump
(4-1.2) it is arranged on same branch road, be used for measuring particulate matter quality control in this branch road and flow through this
The flow of the diluted exhaust of branch road；
Described diluted exhaust gas samping pump (4-1.3), is arranged at another with what dilution tunnel (2) connected
On one branch road, tail end connects sampling airbag, for controlling the flow of the diluted exhaust entering sampling airbag.
6. one kind utilizes the motor vehicle exhaust emission measurement apparatus as described in claim 1 to 5 is arbitrary to carry out
The measuring method of motor vehicle exhaust emission, it is characterised in that comprise the following steps:
Step 1: utilize gas and particulate matter in the diluent air of diluent air inlet end (1) measurement input
Content and the total flow of diluent air measuring input, afterwards diluent air is sent into described dilution tunnel
(2) in；Utilize diluent air particle sampling filter paper (1-2.1) measurement input diluent air in
The quality of grain thing, diluent air particle sampling pump (1-2.2) is utilized to measure the diluent air flowing through
Flow；
Step 2: engine exhaust is inputted dilution tunnel (2) by engine exhaust inlet end (3), dilute
Release air and mix in dilution tunnel (2) with having started to be vented；
Step 3: at diluted exhaust outlet side (4) measurement water vapour content and the steam of analyzer is contained
Amount is corrected；Diluted exhaust outlet side (4) measurement engine exhaust and diluent air are mixed to get
The content of gas and particulate matter in the total flow of diluted exhaust and diluted exhaust, and diluted exhaust is discharged；
Step 4: the content according to gas in diluent air and particulate matter, total stream of the diluent air of input
In amount, the total flow of diluted exhaust and diluted exhaust, the content of gas and particulate matter, obtains engine exhaust
In gas and the quality of Particulate Pollution thing；
Described step 4 farther includes:
Step 4.1: content according to gas in diluent air and particulate matter and the diluent air of input total
Flow obtains the quality of gas and particulate matter in diluent air；
Step 4.2: in total flow according to diluted exhaust and diluted exhaust, the content of gas and particulate matter obtains
The quality of gas and particulate matter in diluted exhaust；
Step 4.3: by the quality of gas in diluted exhaust and particulate matter and gas and particle in diluent air
The quality of thing does difference respectively, obtains the gas in engine exhaust and the quality of Particulate Pollution thing.
7. measuring method according to claim 6, it is characterised in that: described step 4.1 is concrete
For utilizing diluent air particle sampling filter paper (1-2.1) to measure particulate matter in the diluent air obtaining
Quality, flow through the diluent air of diluent air particle sampling pump (1-2.2) flow, through dilution
The content of the flow of air gas sampling pump (1-2.3) input sample airbag and wherein gas and flowmeter
(1-3) total flow of diluent gas that measurement obtains, calculate in described diluent air gas and
The quality of grain thing；
Described step 4.2 is specifically, utilize diluted exhaust particle sampling filter paper (4-1.1) to measure
To diluted exhaust in particulate matter quality, flow through diluted exhaust particle sampling pump (4-1.2) should
The flow of the diluted exhaust of branch road, through diluted exhaust gas samping pump (4-1.3) input sample airbag
The content of flow and wherein gas and Venturi tube (4-2) measure the total flow of the diluted exhaust obtaining,
Calculate the quality of gas and particulate matter in described diluted exhaust.
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| CN105277397A (en) * | 2015-11-27 | 2016-01-27 | 堀场仪器（上海）有限公司 | Vehicle tail gas collection device as well as vehicle tail gas detection system and method |
| CN109443453B (en) * | 2018-12-29 | 2024-04-05 | 昆山优合自动化科技有限公司 | Testing device of constant volume sampler |
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| US3817100A (en) * | 1972-11-03 | 1974-06-18 | Ford Motor Co | Critical flow venturi |
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| EP0611962A1 (en) * | 1993-02-19 | 1994-08-24 | IVECO FIAT S.p.A. | Method and apparatus for extracting particulate from the exhaust gases of diesel engines |
| CN1184253A (en) * | 1996-05-22 | 1998-06-10 | 日野自动车工业株式会社 | Exhaust measuring apparatus |
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| US6823268B2 (en) * | 2002-02-04 | 2004-11-23 | Avl North America Inc. | Engine exhaust emissions measurement correction |
| EP1477801B1 (en) * | 2003-05-14 | 2005-09-14 | Pierburg Instruments GmbH | Method and device for exhaust gas measurement of internal combustion engines |
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| US3817100A (en) * | 1972-11-03 | 1974-06-18 | Ford Motor Co | Critical flow venturi |
| US5184501A (en) * | 1991-05-03 | 1993-02-09 | Horiba Instruments Incorporated | Exhaust sampler and control means |
| EP0611962A1 (en) * | 1993-02-19 | 1994-08-24 | IVECO FIAT S.p.A. | Method and apparatus for extracting particulate from the exhaust gases of diesel engines |
| CN1184253A (en) * | 1996-05-22 | 1998-06-10 | 日野自动车工业株式会社 | Exhaust measuring apparatus |
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Effective date of registration: 20200731 Address after: 100088 Beijing city Haidian District Xitucheng Road No. 8 Co-patentee after: Zhonggong Gaoyuan (Beijing) Automobile Testing Technology Co., Ltd Patentee after: RESEARCH INSTITUTE OF HIGHWAY MINISTRY OF TRANSPORT Address before: 100088 Beijing city Haidian District Xitucheng Road No. 8 Co-patentee before: BEIJING HAIDIAN VEHICLE TEST TECHNOLOGY DEVELOPMENT BRANCH, ZHONGLU HIGH-TECH TRAFFIC TECHNOLOGY GROUP Co.,Ltd. Patentee before: RESEARCH INSTITUTE OF HIGHWAY MINISTRY OF TRANSPORT |