CN207649910U - A kind of modular pollutant of vehicle exhaust on-board emission test platform - Google Patents
A kind of modular pollutant of vehicle exhaust on-board emission test platform Download PDFInfo
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Abstract
In order to meet the different testing requirements of pollutant, the utility model provides a kind of modular pollutant of vehicle exhaust on-board emission test platform.The utility model is other than the on-board emission test system required including the 6th stage emission standard of motor vehicle, further include being set up in parallel the one or more test modules being connected with tail gas exhaust pipe of motor vehicle, it can realize that multimode combined type measures according to actual test demand.In addition, the offline sample collection of the offline component sampling system of the utility model is by equal proportion sampling dilution system according to certain extraction flow proportional sampling from tail gas exhaust pipe of motor vehicle, it ensures the representativeness of offline sample, can fully react the vehicular emission feature of sampling periods.
Description
Technical field
The utility model is related to a kind of motor vehicle emission test platform more particularly to a kind of modular motor vehicles
Exhaust pollutant on-board emission test platform.
Background technology
Recently as the increase of vehicle guaranteeding organic quantity, vehicular emission is increasingly becoming the main source of air pollution.It is special
It is not in some big cities and east dense population areas, moving source is up to 20%-40% to the contribution of fine particle concentration.Together
When, since motor vehicle is travelled mostly in populated area, exhaust emissions directly threatens health.For better management and control machine
Motor-car discharges, and needs to carry out a large amount of exhaust gas composition testing research work.Traditionally, motor vehicle (or engine) is mainly in reality
It tests and carries out simulation test on the rack of room.Although laboratory bench test is easy to control measurement condition, test result repeatability is preferable,
But motor vehicle actual use operating mode and emission control strategy cannot be covered.The real road operating mode of motor vehicle is complicated and changeable, by mesh
Front platform tests motor vehicle or engine up to standard, is likely to occur discharge in actual use and is sharply increased.
Supervision demand is discharged for the motor vehicle real road to become increasingly conspicuous, develops on-board emission test system both at home and abroad
System.Meet the schematic diagram of the on-board emission test system of the 6th stage emission standard of motor vehicle requirement as shown in Figure 1, the system is adopted
Sample frequency >=1Hz, the system include：
1, mounted on the exhaust flow-meter 15 of 7 rear end of tail gas exhaust pipe of motor vehicle, for measuring motor-vehicle tail-gas exhaust stream
Amount；
2, the conventional gas analyzer 14 that pipeline 6 is connected with tail gas exhaust pipe of motor vehicle 7 is sampled by heating, using not
It is divided infrared analysis (NDIR) and measures CO and CO2, total hydrocarbon is measured using hydrogen flame ionization detector (HFID)
(THC), NO and NO is measured using not being divided uv analysis method (NDUV) or chemoluminescence method (CLD)2, utilize electrochemical process (EC)
Measure O2；
3, the particulate solid grain number tester 16 that pipeline 6 is connected with tail gas exhaust pipe of motor vehicle 7 is sampled by heating,
Including being removed by the pre- clasfficiator 163 of the sequentially connected particulate matter of particulate matter transmitting catheter, volatile particles object along exhaust gas flow direction
Device 162, particle counter 161；
4, the satellite navigation and location system 12 being connected with conventional gas analyzer 14 is recorded by the second in motor vehicle driving process
Geographical location (i.e. longitude, latitude and height above sea level) and travel speed；
5, the ECU data being connected with conventional gas analyzer 14 reads equipment 13 (i.e. OBD code readers), reads motor vehicle
Engine operating parameter (such as rotating speed, torque, load, coolant temperature, speed of operation)；
6, the environmental parameter sensor 11 being connected with conventional gas analyzer 14, for collecting temperature, humidity, atmospheric pressure etc.
Environmental parameter.
However, on-board emission test system shown in above-mentioned Fig. 1 is only capable of meeting current automobile real road discharge supervision need
It asks, cannot be satisfied different testing requirements, especially cannot be satisfied the high-resolution full constituent testing requirement of exhaust pollutant.With
The gradually development of measuring technology and deepening continuously for scientific research, especially there is an urgent need to motor-driven for the work of atmosphere pollution source resolution
There is an urgent need for from Conventional pollution (CO for vehicle Study on Emission2、CO、NOXAnd THC) concentration of emission and emission factor extend to exhaust pollutant
High-resolution full constituent discharge characteristics, to promote the process of China's automotive environment management work.
Utility model content
In order to meet the different testing requirements of pollutant, the utility model provides a kind of modular tail gas pollution of motor-driven vehicle
Object on-board emission test platform.
The technical solution of the utility model is：
A kind of modular pollutant of vehicle exhaust on-board emission test platform, including control host and motor vehicle the 6th
The on-board emission test system that stage emission standard requires；It is characterized in that：Further include and the 6th stage of the motor vehicle
The on-board emission test system that discharge standard requires is set up in parallel and is connected with tail gas exhaust pipe of motor vehicle by heating sampling pipe
Logical VOCs and SVOCs in-line analyzers, unconventional gas analysis system, offline component sampling system, online particulate matter measure
One or more of system；
The unconventional gas analysis system includes being set up in parallel through heating sampling pipeline and motor-vehicle tail-gas exhaust
The CH that pipe is connected4Analyzer, N2O analyzers and NH3Analyzer；
The offline component sampling system includes that equal proportion sampling dilution system, particulate matter and volatile organic contaminant are adopted
Sample system；The input terminal of equal proportion sampling dilution system samples pipeline by heating and is connected with tail gas exhaust pipe of motor vehicle, defeated
Outlet is connected with the arrival end of particulate matter and volatile organic contaminant sampling system；
The online particulate measurement system includes firm discharge sampling diluter, particle size spectrometer, the analysis of black carbon
Instrument and online particulate matter quality concentration measuring apparatus；Firm discharge sample diluter input terminal by heating sample pipeline with it is motor-driven
Tail gas exhaust pipe is connected, and particle size spectrometer, black carbon analyzer and online particulate matter quality concentration measuring apparatus are set side by side
It sets and the output end for sampling diluter with firm discharge is connected；
Control host is used for the test data of each module in collecting test platform and is analyzed, and obtains contaminant component
Emission test result.
Further, the particulate matter and volatile organic contaminant sampling system are divided working status sampling system, including equal
The offline sampling instruments of divided working status VOCs, the offline sampling instruments of divided working status PM and SVOCs being connected with the control host；The divided working status
The offline sampling instruments of VOCs include the first divided working status sampling controller and multiple parallel arrangement of VOCs sampling channels；
The first divided working status sampling controller is for obtaining transient state speed/exhaust flow, according to acquired information control
Make the keying of the VOCs sampling channels；
The arrival end of each VOCs sampling channels is dilute by the first divided working status sampling controller and the equal proportion sampling
Release system is connected to, and the outlet end of each VOCs sampling channels is respectively connected with VOCs vacuum sample cans；On each VOCs sampling channels
It is both provided with the flow control valve being connected with the control host；
The offline sampling instruments of divided working status PM and SVOCs include the pre- clasfficiator of particulate matter, the second divided working status sampling controller,
And multiple parallel arrangement of PM and SVOCs sampling channels；
The second divided working status sampling controller is for obtaining transient state speed/exhaust flow, according to acquired information control
Make the keying of the PM and SVOCs sampling channels；
The arrival end of each PM and SVOCs sampling channels is pre- by the second divided working status sampling controller and the particulate matter
The outlet end of clasfficiator is connected to, and the arrival end of the pre- clasfficiator of particulate matter is connected to the equal proportion sampling dilution system, all PM
With SVOCs sampling channels exit be both provided with vacuum air pump or all PM and SVOCs sampling channels outlet converge at it is same
Pipeline is provided with vacuum air pump on the pipeline；The vacuum air pump is connected with the control host；
Be additionally provided on each PM and SVOCs sampling channels PM and SVOCs sampling units and with the control host phase
Flow controller even, and between the pre- clasfficiator of the particulate matter and vacuum air pump；
The first divided working status sampling controller and the second divided working status sampling controller are connected with the control host.
Further, the pressure sensing being connected with the control host is additionally provided on each PM and SVOCs sampling channels
Device.
Further, all PM and SVOCs sampling units are all disposed in temperature control box；The temperature control box is led with the control
Machine is connected.
Further, the sample lines of the VOCs sampling channels use polyfluortetraethylene pipe, the PM and SVOCs samplings
The sample lines in channel use carbon fiber pipe.
Further, there are three the VOCs sampling channels, three low speed, middling speed, high speed speed sections are corresponded to respectively, or
Basic, normal, high three exhaust flow sections are corresponded to respectively；
There are three PM the and SVOCs sampling channels, corresponds to three low speed, middling speed, high speed speed sections respectively, or respectively
Corresponding basic, normal, high three exhaust flow sections.
Further, the filter membrane of PM with SVOCs sampling units is different on each PM with SVOCs sampling channels.
Further, the on-board emission test platform includes VOCs and SVOCs in-line analyzers, unconventional gas analysis
System, offline component sampling system, online particulate measurement system.
The advantages of the utility model：
1, the utility model provides the test platform of a set of modular combination, can need to use single mode according to practical measurement
Block measures, or uses multimode measurement in a closed series；The offline sample collection of the offline component sampling system of the utility model passes through
Equal proportion sampling dilution system is from tail gas exhaust pipe of motor vehicle according to certain extraction flow proportional sampling, it is ensured that offline sample
Representativeness, can fully react the vehicular emission feature of sampling periods.
2, in the utility model offline component sampling system realize volatile organic matter (VOCs) in motor-vehicle tail-gas,
The divided working status synchronized sampling of particulate matter (PM) and semi-volatile organic matter (SVOCs), sampled result can reflect that vehicle exists well
Discharge characteristics under different operating modes；The quantity of PM and VOCs sampling channels and VOCs samplings are logical in offline component sampling system
The quantity in road can flexibly be set according to speed/exhaust flow range, disclosure satisfy that different testing requirements.
3, offline component sampling system has sample lines leak detection function in the utility model, can prevent sample gas leakage.
4, PM the and SVOCs sampling units of offline component sampling system are all disposed within and control host phase in the utility model
It is by temperature control box that temperature in PM and SVOCs sampling units is constant within a certain range in temperature control box even, to avoid SVOCs
Change the distributed mutually of SVOCs with the variation of temperature after sampling.Furthermore it is also possible to by changing the temperature in temperature control box,
Study influence of the different sample temperatures to PM and SVOCs sampled results.
5, the utility model can realize that pollutant of vehicle exhaust full constituent is tested, and include the exhaust pollution of laws and regulations requirement
It measures, greenhouse effects pollutant (CO2、CH4、N2O, black carbon) discharge measuring and for VOCs derived components spectrum and particle material resource at
The acquisition of open score sample.
6, PM and VOCs can carry out offline sampling and on-line testing simultaneously in the utility model, utilize off-line data amendment
Online data can more accurately assess the instantaneous emission feature of motor vehicle real road.
7, the utility model is also applied for the emission test of non-rice habitats mobile pollution source.
Description of the drawings
Fig. 1 is the on-board emission test system schematic of the 6th stage vehicle emission standards requirement；
Fig. 2 is the utility model embodiment pollutant of vehicle exhaust on-board emission test platform schematic diagram；
Reference sign：
The on-board emission test system that the 6th stage emission standard of 1- motor vehicles requires；11- environmental parameter sensors；12-
Satellite navigation and location system；13-ECU digital independent equipment；14- conventional gas analyzers；15- exhaust flow-meters；16- solid-states
Grain object grain number tester；161- particle counters；162- volatile particles object removers；The pre- clasfficiator of 163- particulate matters；
The unconventional gas analysis systems of 2-；21-CH4Analyzer；22-N2O analyzers；23-NH3Analyzer；
The online particulate measurement systems of 3-；31- firm discharges sample diluter；The black carbon analyzers of 32-；The online particles of 33-
Amount of substance concentration measuring apparatus；34- particle size spectrometers；
The offline component sampling systems of 4-；
The offline sampling instruments of 41- divided working status VOCs；411-VOCs vacuum sample cans；412- flow control valves；413- first divides
Operating mode sampling controller；
The offline sampling instrument of 42- divided working status PM and SVOCs；421- vacuum air pumps；422- flow controllers；423- particulate matters are pre-
Clasfficiator；424- the second divided working status sampling controllers；425-PM and SVOCs sampling units；4251-SVOCs filter core cylinders；4252-
Filter membrane bracket；426- temperature control boxs；427- pressure sensors；
43- equal proportion sampling dilution systems；
5-VOCs and SVOCs in-line analyzers；6- heating sampling pipelines；7- tail gas exhaust pipe of motor vehicle；8- controls host.
Specific implementation mode
The utility model is further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 2, the pollutant of vehicle exhaust on-board emission test platform that the present embodiment is provided can realize pollution
Object full constituent is tested, including pollutant on-board emission test system and control 8 two parts of host.
One, pollutant full constituent on-board emission test system
Pollutant full constituent on-board emission test system includes not only the 6th stage emission standard of motor vehicle as shown in Figure 1
It is required that on-board emission test system 1, further include and shown in Fig. 1 test system in parallel setting, by heating sample pipeline 6 (adopt
Hydrocarbon is can avoid with heating sampling pipeline and vapor condenses in sampling pipe) it is connected with tail gas exhaust pipe of motor vehicle 7
Logical VOCs and SVOCs in-line analyzers 5, unconventional gas analysis system 2, offline component sampling system, online particulate matter are surveyed
Amount system 3, VOCs and SVOCs in-line analyzers 5, unconventional gas analysis system 2, offline component sampling system, online particle
Object measuring system 3 samples pipeline 6 by heating and is connected with tail gas exhaust pipe of motor vehicle 7.
Sample frequency >=0.1Hz of VOCs and SVOCs in-line analyzers 5, utilizes on-line mass spectroscopy or fourier-transform infrared
Technology (FTIR) realizes the transient state (>=1Hz) of a variety of VOCs and SVOCs components or sub- instantaneous measurement (>=0.1Hz).Because motor-driven
Vehicle exhaust amount and fuel oil combustion case are real-time changes, so the discharge of pollutant is also transient changing, frequency requirement is
It is required that instrument realizes that transient state (or sub- transient state) measures, with the instantaneous emission feature of analysis assessment motor vehicle.
Unconventional gas analysis system 2 includes the CH being set up in parallel4Analyzer 21, N2O analyzers 22 and NH3Analyzer 23；
Sample frequency >=1Hz of the unconventional gas analysis system of the present embodiment 2；CH4Analyzer 21 utilizes hydrogen flame ion method (HFID)
Measure CH4Concentration of emission, N2O analyzers 22 and NH3Analyzer 23 is using spectroscopy measurement N20 and NH3Concentration of emission.
Offline component sampling system 4 is adopted including equal proportion sampling dilution system 43, particulate matter and volatile organic contaminant
Sample system；The input terminal of equal proportion sampling dilution system 43 samples pipeline 6 by heating and is connected with tail gas exhaust pipe of motor vehicle 7
Logical, output end is connected with the arrival end of particulate matter and volatile organic contaminant sampling system.Equal proportion sampling dilution system
43 from heating it is ensured that sample in pipeline 6 according to certain extraction flow proportional sampling.
Particulate matter and volatile organic contaminant sampling system are divided working status sampling system in the present embodiment, including with control
The offline sampling instrument of the connected offline sampling instruments 41 of divided working status VOCs of host 8 processed, divided working status PM and SVOCs 42；
The offline sampling instruments of divided working status VOCs 41 include the first divided working status sampling controller 413 being connected with control host 8 and
Multiple parallel arrangement of VOCs sampling channels are triple channel, corresponding different speed/exhaust flow sections in Fig. 2；In other embodiment
In, it is possibility to have three or more VOCs sampling channels, corresponding speed section/exhaust flow section can be according to actual samples
Demand is segmented；Since polyfluortetraethylene pipe can bear positive pressure 1.6Mpa, negative pressure 77Kpa, high temperature resistant, it is low temperature resistant (can -60 DEG C~
Normal use in+260 DEG C), there is extremely excellent chemical stability, reliable excellent corrosion resistance (to most of chemicals and
Solvent shows inertia, energy strong alkali-acid resistance, water and various organic solvents), therefore the sampling of the present embodiment VOCs sampling channels
The material selection polytetrafluoroethylene (PTFE) of pipeline；
First divided working status sampling controller 413 is used for from ancillary equipment (such as satellite navigation and location system, automobile ECU number
According to reading equipment or portable car-mounted test system) transient state speed/exhaust flow is obtained, control three according to acquired information
The open and close of VOCs sampling channels；The arrival ends of each VOCs sampling channels goes out with equal proportion sampling dilution system 43
The connection of mouth end, the outlet end of each VOCs sampling channels is respectively connected with VOCs vacuum sample can 411；On each VOCs sampling channels
It is additionally provided with the flow control valve 412 for adjusting sampling flow size being connected with control host 8；Each flow control valve
Pressure gauge is mounted on 412, the pressure gauge is connected to the sample lines of VOCs sampling channels；When VOCs vacuum sample cans
After 411 open, is changed by pressure gauge registration, can check the air-tightness of VOCs sampling channel sample lines；
When work, the tail gas after the dilution of equal proportion sampling dilution system 43, from the offline sampling instruments of divided working status VOCs 41 into
Gas port enters three VOCs sampling channels, and the VOCs in tail gas is collected by corresponding VOCs vacuum sample can 411, realizes three vehicles
Speed/flow section acquires simultaneously.
The offline sampling instruments 42 of divided working status PM and SVOCs include the pre- clasfficiator 423 of particulate matter, with control that host 8 is connected the
Two divided working status sampling controllers 424 and multiple parallel arrangement of PM and SVOCs sampling channels are triple channel shown in Fig. 2,
Corresponding different speed/exhaust flow sections；In other embodiments, it is possibility to have three or more PM and SVOCs sampling channels,
Corresponding speed section/exhaust flow section can be segmented according to actual samples demand；Due to carbon fiber pipe intensity it is high, it is corrosion-resistant,
Endurance, creep resistant have many advantages, such as that conductive (antistatic absorption) property, coefficient of thermal expansion be small, energy-absorbing antidetonation, the present embodiment PM and
The material selection carbon fiber pipe of the sample lines of SVOCs sampling channels；Wherein, the electric conductivity of carbon fiber pipe can prevent particulate matter
Electrostatic Absorption occurs when being transmitted in sample lines；
Second divided working status sampling controller 424 is used for from ancillary equipment (such as satellite navigation and location system, automobile ECU number
According to reading equipment or portable car-mounted test system) obtain transient state speed/exhaust flow, according to acquired information control PM and
The open and close of SVOCs sampling channels；The arrival end of each PM and SVOCs sampling channels passes through the pre- clasfficiator of particulate matter
423 are connected to the outlet end of equal proportion sampling dilution system 43, are respectively provided with close to exit on all PM and SVOCs sampling channels
It is useful for providing the vacuum air pump 421 of sampling power；In other embodiments, all PM and SVOCs sampling channels outlets convergence
In the vacuum air pump 421 that is connected of host is provided with and controlled on same pipeline, the pipeline；On each PM and SVOCs sampling channels
It (includes filter membrane bracket 4252 equipped with quartz fibre filter membrane and equipped with PUF's to be additionally provided with PM and SVOCs sampling units 425
SVOCs filter core cylinders 4251) and with control host be connected for adjust sampling flow size flow controller 422 and use
In the pressure sensor 427 of leak detection, PM and SVOCs sampling units 425 and flow controller 422 are located at the pre- clasfficiator of particulate matter
Between 423 and vacuum air pump 421；Second divided working status sampling controller 424 is connected with control host.
PM and SVOCs sampling units 425 include the filter membrane equipped with particle sampling filter membrane set gradually along airflow direction
Bracket 4252 and SVOCs filter core cylinders 4251 equipped with PUF；
In view of gas, solid phase SVOCs can change the distributed mutually of SVOCs with the variation of temperature, (such as gas phase SVOCs turns
Become solid phase SOVCs), therefore, the present embodiment by divided working status PM and SVOCs three sampling channels of offline sampling instrument PM and
SVOCs sampling units 425 are all disposed within and control in the temperature control box 426 that is connected of host, by temperature control box 426 by PM and SVOCs
Temperature is constant within a certain range in sampling unit 425, changes after sampling with the variation of temperature to avoid SVOCs
The distributed mutually of SVOCs.Furthermore it is also possible to by changing the temperature in temperature control box 426, study different sample temperatures to PM and
The influence of SVOCs sampled results.
When work, vacuum air pump 421 extracts tail gas with constant flow rate, and tail gas is from the offline sampling instrument of divided working status PM and SVOCs
42 air inlets enter three PM and SVOCs sampling channels, and the PM particulate matters in tail gas are by the pre- clasfficiator of particulate matter 423 from tail gas
It separates, is trapped on the particle sampling filter membrane of known quality, and gas phase SVOCs is fitted with the SVOCs filter core cylinders of PUF
4251 collect, to realize three speeds/flow section PM and SVOCs synchronized sampling.
Since the offline sampling instrument of divided working status PM and SVOCs 42 can carry out PM and SVOCs synchronized samplings, can analyze
Assigned characteristics of the characteristic component between different phase；The filter membrane of the PM and SVOCs sampling units of each sampling channel can be different, example
Teflon filter membrane and quartz fibre filter membrane can be utilized to sample simultaneously when being sampled such as binary channels, wherein Teflon filter membrane collects
Analysis of the sample for the inorganic components such as inorganic elements, water soluble ion, the sample that quartz filter collects (has for OC
Machine carbon), the analyses of the organic components such as EC (elemental carbon) and polycyclic aromatic hydrocarbon.
Online particulate measurement system 3 includes firm discharge sampling diluter 31, particle size spectrometer 34, the analysis of black carbon
Instrument 32 and online particulate matter quality concentration measuring apparatus 33；The input terminal that firm discharge samples diluter 31 samples pipeline by heating
6 are connected with tail gas exhaust pipe of motor vehicle 7, particle size spectrometer 34, black carbon analyzer 32 and online particulate matter quality concentration
Measuring instrument 33 is set up in parallel and is connected with the output end of firm discharge sampling diluter 31.Firm discharge sampling diluter can be adopted
With two-stage dilution system, it is condensed into PM and PM " growing up " to avoid the occurrence of VOCs, the first order is diluted to heating dilution；The second level is dilute
It is interpreted as room temperature dilution.Black carbon analyzer measures black carbonaceous amount concentration of emission using optical absorption method or optoacoustic method；Online particulate matter
Mass concentration measuring instrument utilizes diffusional charging method or micro oscillation balance measurement particulate matter quality concentration of emission；Particle size is composed
Instrument passes through electrostatic after being classified particulate matter by particle size using difference particle electromigration device or particulate matter multi-stage impinger
Count second by second measurement exhaust particulate object Size Distribution.3 sample frequencys of online particulate measurement system >=1Hz.
Since each section of the utility model pollutant on-board emission test system works independently parallel, at it
It can need to measure using single module according to practical measurement in his embodiment, or use multimode measurement in a closed series, such as carry out method
When rule test, on-board emission test system shown in Fig. 1 can be selected to realize that the 6th stage carried on vehicle emission regulation demands are dirty
Contaminate object (such as NOX, CO, THC), PN and CO2The on-line measurement and collection of discharge and relevant parameter；It is dirty to carry out motor vehicle greenhouse effects
Object emission test is contaminated, on-board emission test system shown in Fig. 1, CH can be selected4Analyzer, N2O analyzers and black carbon analyzer group
It closes, realizes CO2、CH4、N2The on-line measurement of four kinds of motor-vehicle tail-gas greenhouse effects pollutant emissions such as O and black carbon；Carry out motor-driven
When vehicle VOCs derived components are composed and particulate matter derived components spectrum is tested, offline component sampling system can be selected to carry out motor-vehicle tail-gas
The measurement of VOCs, SVOCs and particulate matter full constituent and collection analysis.
Two, host 8 is controlled
The present embodiment, which controls host 8, has touch display screen, and is mounted with controlling of sampling software, has human-computer interaction work(
Can, it can be instructed by touch display screen input sample thereon, such as sampling timing, delay sampling, timing sampling, inquiry sampling
Data etc.；Also sample introduction sequence, trigger parameter etc. can be set to realize divided working status controlling of sampling by controlling host.
Host 8 is controlled other than above-mentioned function, also has the function of data collection and analysis and remote data sending function；Control
Host 8 can collect the test data of record pollutant on-board emission test system, and Develop Data time unifying and discharge are tied
Fruit such as calculates at the work of a series of Data Analysis Services, will treated that result is sent to remote terminal service to test data
Device, in case scientific research personnel and supervision department use.Specific acquisition and processing procedure are as follows：
Step 1, data acquisition；
The test number of each test module in the full constituent test platform that data acquisition and analysis system acquisition step 1 is built
According to；
The corresponding testing time of the test data is carried out time unifying by step 2, control host；
For above-mentioned full constituent test platform, since the measurement data of data acquisition and analysis system acquisition is from different instrument
Device, so needing that registration process will be carried out from the test data of different instruments before emission result calculating.The specific method is as follows：
Test data is divided into five classes by step 2.1：
The first kind, the test data for the on-board emission test system 1 that the 6th stage emission standard of motor vehicle requires；
Second class, the on-line measurement data of exhaust flow-meter 15, including exhaust mass flow, exhaust volumetric flow, exhaust
Temperature, pressure at expulsion and exhaust gas density；
Third class, engine operation data, including torque, speed, temperature, fuel consumption rate and come from ECU data
Read the real-time speed of equipment 13；
4th class, the online data that satellite navigation and location system 12 is collected, including real-time speed, longitude, latitude, height above sea level；
5th class, unconventional gas analysis system 2, online particulate measurement system 3, VOCs and SVOCs in-line analyzers 5
Test data；
Step 2.2 parameter selection；
The time unifying of each classification test data and other classification test datas preferentially selects shared test data,
Or the parameter for selecting the highest test data of correlation to be calculated as relative coefficient；Specially：
(a) the time unifying selected parameter of the first kind and secondary sources：CO2Concentration and exhaust mass flow；
(b) the time unifying selected parameter of the first kind and third class data：CO2Concentration and engine fuel consumption rate；
(c) the time unifying selected parameter of third class and the 4th class data：Come from the real-time of satellite navigation and location system
Speed and the real-time speed for coming from ECU data reading equipment；
(d) between the first kind and the 5th class data time be aligned or the 5th each test data of class between data time pair
Neat selected parameter：The relevant test parameter of distinct device, including THC concentration and VOCs concentration, CO concentration and black concentration of carbon, particle
Amount of substance concentration of emission and black concentration of carbon.
Step 2.3 carries out data time alignment；
Step 2.3.1, which is synchronized, opens each test equipment in test platform, carries out preliminary data time unifying；
Between step 2.3.2 utilizes the function R=CORRCOEF (x, move_y) in MATLAB to carry out different test equipments
Alignment of data, wherein x, move_y are the column vector of a n*1, respectively represent that two equipment are shared or relevant transient test
Data, the n are length of testing speech, unit s；
Step 2.3.3 carries out data dependence analysis respectively on the basis of x, with the test data of move_y ± 15s, works as phase
Data time reaches final alignment when closing property maximum.
After alignment of data, y test datas start position may change and (be moved forward or rearward), therefore calculate
Before emission result, the test data starting point for reexamining two distinct devices is needed, is started with x and y when calculating emission result
It is calculated on the basis of the data time of time at the latest.
Step 3, emission result calculate：
Due to on-road emission test method compared to laboratory test test condition it is more complex, and at present PM, VOCs and
The in-situ measurement equipment of SVOCs is still immature, therefore the reliability of PM, VOCs and SVOCs online data leaves a question open.Therefore this practicality is new
Type carries out the offline sampling and on-line testing of PM, SVOCs and VOCs simultaneously, and online data is corrected using off-line data, can be more accurate
The instantaneous emission feature of true assessment motor vehicle real road.
The specific method is as follows：
Step 3.1 gaseous pollutant instantaneous emission result calculates：
It is 1.293kg/m to be vented the density under standard state (0 DEG C and 101.3kPa)3, calculated using following equation:
In formula：
I is CO2、CO、NO、NO2、THC、CH4、N2O or NH3；
gERiFor the instantaneous mass rate of discharge of gaseous pollutant i, g/s；
MiFor the molal weight of gaseous pollutant i, g/mol；
CgiFor the instantaneous concentration of emission of gaseous pollutant i in vehicle Raw exhaust, ppm；The vehicle Raw exhaust refers to
Undiluted Vehicular exhaust；
FmFor vehicle instantaneous exhaust gas mass flow, kg/h；
Step 3.2 particulate matter grain number instantaneous emission result calculates：
In formula：
nERiFor the instantaneous rate of discharge of particulate matter grain number, #/s；
For the particulate matter grain number concentration of diluted exhaust, and correct to standard state (0 DEG C and 101.3kPa) #/cm3；
DF is sample gas phase for the extension rate of Raw exhaust, dimensionless；
FvFor instantaneous exhaust gas volume flow, L/s.
Step 3.3PM, SVOCs, VOCs and its instantaneous emission result of component calculate：
3.3.1 following formula is utilized to calculate correction factor k0j：
3.3.2 following formula is utilized to calculate the instantaneous discharge quality cER of revised pollutant jj：
In formula：
J is PM, SVOCs or VOCs and its component；
k0jFor correction factor, dimensionless；
mjFor the quality for the pollutant j that offline sampling instrument collects during experiment, mg；
k′j43 flow of equal proportion sampling dilution system for pollutant j and offline sample devices sampling flow ratio, it is immeasurable
Guiding principle；
k″jFor the ratio of automotive emission flow and 43 sampling flow of equal proportion sampling dilution system；
CmjFor the instantaneous mass concentration of emission of pollutant j, mg/m3；
QjFor the instantaneous sampling flow of pollutant j, m3/min；
k1j31 flow of diluter and in-situ measurement equipment sampling flow ratio are sampled for the firm discharge of pollutant j, it is immeasurable
Guiding principle；
k2jThe ratio of dilution system sampling flow, dimensionless are sampled for emission from vehicles flow and firm discharge；
The k when in-situ measurement equipment is directly sampled from Raw exhaust1j×k2jValue is 1；
T is the off-line device sampling time of pollutant j, s；
cERjFor the instantaneous discharge qualities of pollutant j after correction, g/s；
Step 4, emission factor calculate；
In formula：
EF is pollutants emission characteristics, and unit is determined according to X, is g/km, g/kWh or g/kg-fuel；
ER is the pollutant emission rate calculated in step 3, refers specifically to the gER being calculated in step 4i、nERiOr
cERj；
X is automobile's instant velocity (km/s), instantaneous work((kWh/s) or instantaneous oil consumption (kg/s)；
T is Contaminant measurement time, s.
Claims (8)
1. a kind of modular pollutant of vehicle exhaust on-board emission test platform, including control host (8) and motor vehicle the
The on-board emission test system (1) that six stage emission standards require；It is characterized in that：Further include and the 6th stage of the motor vehicle
The on-board emission test system (1) that discharge standard requires is set up in parallel and by heating sampling pipe and tail gas exhaust pipe of motor vehicle
(7) VOCs the and SVOCs in-line analyzers (5) that are connected, unconventional gas analysis system (2), offline component sampling system
(4), one or more of online particulate measurement system (3)；
The unconventional gas analysis system (2) includes being set up in parallel through heating sampling pipeline (6) and motor-vehicle tail-gas row
The CH that tracheae (7) is connected4Analyzer (21), N2O analyzers (22) and NH3Analyzer (23)；
The offline component sampling system (4) includes equal proportion sampling dilution system (43), particulate matter and volatility organic contamination
Object sampling system；The input terminal of equal proportion sampling dilution system (43) samples pipeline (6) by heating and is vented with motor-vehicle tail-gas
Pipe (7) is connected, and output end is connected with the arrival end of particulate matter and volatile organic contaminant sampling system；
The online particulate measurement system (3) includes firm discharge sampling diluter (31), particle size spectrometer (34), black
Carbon analyzer (32) and online particulate matter quality concentration measuring apparatus (33)；The input terminal of firm discharge sampling diluter (31) passes through
Heating sampling pipeline (6) is connected with tail gas exhaust pipe of motor vehicle (7), particle size spectrometer (34), black carbon analyzer (32)
It is set up in parallel with online particulate matter quality concentration measuring apparatus (33) and is connected with the output end of firm discharge sampling diluter (31)
It is logical；
Control host (8) is used for the test data of each module in collecting test platform and is analyzed, and obtains contaminant component
Emission test result.
2. modular pollutant of vehicle exhaust on-board emission test platform according to claim 1, it is characterised in that：
The particulate matter and volatile organic contaminant sampling system are divided working status sampling system, including equal are connected with the control host
The offline sampling instruments of divided working status VOCs (41), the offline sampling instruments of divided working status PM and SVOCs (42)；The divided working status VOCs is adopted offline
Sample instrument (41) includes the first divided working status sampling controller (413) and multiple parallel arrangement of VOCs sampling channels；
The first divided working status sampling controller (413) is for obtaining transient state speed/exhaust flow, according to acquired information control
Make the keying of the VOCs sampling channels；
The arrival end of each VOCs sampling channels is dilute by the first divided working status sampling controller (413) and the equal proportion sampling
Release system (43) is connected to, and the outlet end of each VOCs sampling channels is respectively connected with VOCs vacuum sample can (411)；Each VOCs is adopted
The flow control valve (412) being connected with the control host is both provided on sample channel；
The offline sampling instruments of divided working status PM and SVOCs (42) include the pre- clasfficiator of particulate matter (423), the sampling control of the second divided working status
Device (424) processed and multiple parallel arrangement of PM and SVOCs sampling channels；
The second divided working status sampling controller (424) is for obtaining transient state speed/exhaust flow, according to acquired information control
Make the keying of the PM and SVOCs sampling channels；
The arrival end of each PM and SVOCs sampling channels passes through the second divided working status sampling controller (424) and the particulate matter
The outlet end of pre- clasfficiator (423) is connected to, the arrival end of the pre- clasfficiator of particulate matter (423) and the equal proportion sampling dilution system
(43) it is connected to, all PM and SVOCs sampling channels exit is both provided with vacuum air pump (421) or all PM and SVOCs are adopted
Sample channel outlet converges at same pipeline, and vacuum air pump (421) is provided on the pipeline；The vacuum air pump (421) and institute
Control host is stated to be connected；
Be additionally provided on each PM and SVOCs sampling channels PM and SVOCs sampling units (425) and with the control host phase
Flow controller (422) even, and between the pre- clasfficiator of the particulate matter (423) and vacuum air pump (421)；
The first divided working status sampling controller (413) and the second divided working status sampling controller (424) with the control host
It is connected.
3. modular pollutant of vehicle exhaust on-board emission test platform according to claim 2, it is characterised in that：
The pressure sensor (427) being connected with the control host is additionally provided on each PM and SVOCs sampling channels.
4. modular pollutant of vehicle exhaust on-board emission test platform according to claim 2 or 3, feature exist
In：All PM and SVOCs sampling units (425) are all disposed in temperature control box (426)；The temperature control box (426) and the control
Host is connected.
5. modular pollutant of vehicle exhaust on-board emission test platform according to claim 4, it is characterised in that：
The sample lines of the VOCs sampling channels use polyfluortetraethylene pipe, the sample lines of the PM and SVOCs sampling channels to adopt
Use carbon fiber pipe.
6. modular pollutant of vehicle exhaust on-board emission test platform according to claim 2 or 3, feature exist
In：There are three the VOCs sampling channels, correspond to respectively low speed, middling speed, high speed three speed sections, or correspond to respectively it is low, in,
High three exhaust flow sections；
There are three PM the and SVOCs sampling channels, corresponds to three low speed, middling speed, high speed speed sections respectively, or correspond to respectively
Basic, normal, high three exhaust flow sections.
7. modular pollutant of vehicle exhaust on-board emission test platform according to claim 2 or 3, feature exist
In：The filter membrane material of PM with SVOCs sampling units (425) is different on each PM with SVOCs sampling channels.
8. modular pollutant of vehicle exhaust on-board emission test platform according to claim 1 or 2 or 3, special
Sign is：The on-board emission test platform includes VOCs and SVOCs in-line analyzers (5), unconventional gas analysis system
(2), offline component sampling system (4), online particulate measurement system (3).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501269A (en) * | 2019-08-28 | 2019-11-26 | 安徽星网软件技术有限公司 | A kind of tail gas monitoring device and method based on six standard of state |
| CN110838192A (en) * | 2019-11-06 | 2020-02-25 | 清华大学 | Correction method of OBD remote online monitoring data |
| CN115638839A (en) * | 2022-11-16 | 2023-01-24 | 中汽科技(北京)有限公司 | Vehicle ammonia emission test system and test method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501269A (en) * | 2019-08-28 | 2019-11-26 | 安徽星网软件技术有限公司 | A kind of tail gas monitoring device and method based on six standard of state |
| CN110838192A (en) * | 2019-11-06 | 2020-02-25 | 清华大学 | Correction method of OBD remote online monitoring data |
| CN110838192B (en) * | 2019-11-06 | 2020-10-09 | 清华大学 | Correction method of OBD remote online monitoring data |
| CN115638839A (en) * | 2022-11-16 | 2023-01-24 | 中汽科技(北京)有限公司 | Vehicle ammonia emission test system and test method thereof |
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