CN108106887B - System for sampling particulate matters and volatile organic pollutants in tail gas of motor vehicle according to working conditions - Google Patents
System for sampling particulate matters and volatile organic pollutants in tail gas of motor vehicle according to working conditions Download PDFInfo
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- CN108106887B CN108106887B CN201711464910.5A CN201711464910A CN108106887B CN 108106887 B CN108106887 B CN 108106887B CN 201711464910 A CN201711464910 A CN 201711464910A CN 108106887 B CN108106887 B CN 108106887B
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- 238000005070 sampling Methods 0.000 title claims abstract description 195
- 239000002957 persistent organic pollutant Substances 0.000 title claims abstract description 8
- 239000013618 particulate matter Substances 0.000 claims abstract description 28
- 230000001052 transient effect Effects 0.000 claims abstract description 7
- 239000012855 volatile organic compound Substances 0.000 claims description 50
- 238000010790 dilution Methods 0.000 claims description 7
- 239000012895 dilution Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 3
- 239000000356 contaminant Substances 0.000 claims 8
- 238000012360 testing method Methods 0.000 abstract description 17
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 13
- 239000012071 phase Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
Abstract
The invention provides a motor vehicle tail gas particulate matter and volatile organic pollutant split-working condition sampling system which can be used for vehicle-mounted test of an actual road. According to the invention, the sampling channels are arranged in parallel, the sub-working condition sampling controller is utilized to control the opening and closing of the sampling channels according to the transient vehicle speed/tail gas flow, so that the sub-working condition synchronous sampling of volatile organic matters, particulate matters and semi-volatile organic matters is realized, and the sampling result can well reflect the emission characteristics of the vehicle under different working conditions. The invention has wide application range, and can flexibly set the number of corresponding acquisition channels and the speed/flow range of each channel so as to meet different test requirements.
Description
Technical Field
The invention belongs to the technical field of environment monitoring instruments, and relates to a system for sampling tail gas particulate matters and volatile organic pollutants of a motor vehicle according to working conditions.
Background
With the increasing maintenance of motor vehicles in recent years, motor vehicle emissions are becoming a major source of air pollution. The pollutants discharged by the motor vehicle contain a large amount of solid-phase and gas-phase organic matters (such as polycyclic aromatic hydrocarbon and the like) and seriously harm the health of human bodies. In order to better manage the emissions of motor vehicles, a great deal of test research work needs to be carried out. Traditionally, motor vehicles (or engines) have been tested primarily in simulation on laboratory benches. The current emission standard only requires laboratory bench tests to develop time-period offline sampling of motor vehicle exhaust Particulate Matters (PM), but has no measurement requirements on Volatile Organic Compounds (VOCs) and semi-volatile organic compounds (SVOCs). In addition, although the laboratory bench test is easy to control the test working condition, the test result repeatability is good, the actual road working condition of the motor vehicle is complex and changeable, and the emission amplification is possibly increased in the actual use process, so that the laboratory bench test cannot reflect the actual level of the emission of the vehicle on the actual road.
Therefore, the vehicle-mounted test of the actual road gradually becomes one of the main methods of the emission test of the motor vehicle, and a great deal of research on measuring the emission characteristics of the gaseous pollutants of the vehicle on the actual road by adopting the vehicle-mounted method is available internationally. However, sampling and measuring organic matters in different phases such as PM, SVOCs and VOCs still remain a difficulty in related research of vehicle-mounted emission test of motor vehicles, because the existing time-period-based off-line sampling method cannot accurately reflect the emission characteristics of vehicles under various working conditions.
Disclosure of Invention
The invention provides a motor vehicle tail gas particulate matter and volatile organic pollutant split-working condition sampling system which can be used for vehicle-mounted test of an actual road.
The technical scheme of the invention is as follows:
the system for sampling the tail gas particulate matters and the volatile organic pollutants of the motor vehicle according to working conditions comprises a control host; the special feature is that: the system also comprises a split working condition VOCs off-line sampling instrument, a split working condition PM and SVOCs off-line sampling instrument which are all connected with the control host;
the split working condition VOCs off-line sampling instrument comprises a first split working condition sampling controller and a plurality of VOCs sampling channels which are arranged in parallel;
the first sub-working condition sampling controller is used for acquiring transient vehicle speed/tail gas flow and controlling the opening and closing of the VOCs sampling channel according to the acquired information;
the inlet end of each VOCs sampling channel is communicated with the tail gas dilution system at the front end of the sampling system through a first sub-working condition sampling controller, and the outlet end of each VOCs sampling channel is connected with a VOCs vacuum sampling tank; each VOCs sampling channel is also provided with a flow control valve connected with the control host;
the PM and SVOCs off-line sampling instrument comprises a particulate matter prescaler, a second division condition sampling controller and a plurality of PM and SVOCs sampling channels which are arranged in parallel;
the second sub-working condition sampling controller is used for acquiring transient vehicle speed/tail gas flow and controlling the opening and closing of the PM and SVOCs sampling channels according to the acquired information;
the inlet end of each PM and SVOCs sampling channel is communicated with the outlet end of the particulate matter pre-classifier through a second sub-working condition sampling controller, the inlet end of the particulate matter pre-classifier is communicated with the tail gas dilution system at the front end of the sampling system, the outlets of all PM and SVOCs sampling channels are provided with vacuum air pumps, or the outlets of all PM and SVOCs sampling channels are converged on the same pipeline, and the pipeline is provided with the vacuum air pumps; the vacuum air pump is connected with the control host;
each PM and SVOCs sampling channel is also provided with a PM and SVOCs sampling unit and a flow controller connected with the control host, and the PM and SVOCs sampling units are positioned between the particulate matter pre-classifier and the vacuum air pump;
the first sub-working condition sampling controller and the second sub-working condition sampling controller are connected with the control host.
Further, each PM and SVOCs sampling channel is also provided with a pressure sensor connected with the control host.
Further, all PM and SVOCs sampling units are arranged in the temperature control box; the temperature control box is connected with the control host.
Furthermore, the sampling pipeline of the VOCs sampling channel adopts a polytetrafluoroethylene tube.
Further, the sampling pipelines of the PM and SVOCs sampling channels adopt carbon fiber tubes.
Further, the particle size of the particle pre-classifier was 2.5 μm.
Further, the number of the VOCs sampling channels is three, and the VOCs sampling channels respectively correspond to three vehicle speed sections of low speed, medium speed and high speed, or respectively correspond to three tail gas flow sections of low speed, medium speed and high speed; the PM and SVOCs sampling channels are three, and respectively correspond to three vehicle speed sections of low speed, medium speed and high speed, or respectively correspond to three tail gas flow sections of low speed, medium speed and high speed.
Further, the PM and SVOCs sampling unit comprises a filter membrane bracket provided with a particulate matter sampling filter membrane and a SVOCs filter cartridge provided with a PUF, which are sequentially arranged along the airflow direction.
Further, the control host has a man-machine interaction function.
The invention has the following beneficial effects:
the invention realizes the synchronous sampling of Volatile Organic Compounds (VOCs), particulate Matters (PM) and semi-volatile organic compounds (SVOCs) in the tail gas of the motor vehicle according to the working conditions, and the sampling result can well reflect the emission characteristics of the vehicle under different working conditions.
The invention has wide application range, and can flexibly set the number of corresponding acquisition channels and the speed/flow range of each channel so as to meet different test requirements.
Drawings
FIG. 1 is a schematic representation of an embodiment of the present invention.
Reference numerals illustrate:
the system comprises a 1-split working condition VOCs off-line sampling instrument, an 11-VOCs vacuum sampling tank, a 12-flow control valve, a 13-sampling pipeline and a 14-first split working condition sampling controller;
the system comprises a 2-split working condition PM and SVOCs off-line sampling instrument, a 21-vacuum air pump, a 22-flow controller, a 23-sampling pipeline, a 24-pressure sensor, a 25-PM and SVOCs sampling unit, a 251-filter membrane bracket, a 252-SVOCs filter cartridge, a 26-temperature control box, a 27-second split working condition sampling controller and a 28-particulate matter pre-classifier;
3-auxiliary equipment, 4-control host.
Detailed Description
The invention is further explained below with reference to the drawings.
Referring to fig. 1, the system for sampling the exhaust particulate matters and the volatile organic pollutants of the motor vehicle according to the embodiment comprises a control host 4, and a split working condition VOCs offline sampling instrument 1, a split working condition PM and a SVOCs offline sampling instrument 2 which are all connected with the control host 4;
the split-working-condition VOCs off-line sampling instrument 1 comprises a first split-working-condition sampling controller 14 and three VOCs sampling channels which are arranged in parallel, wherein the first split-working-condition sampling controller 14 is connected with a control host 4; the three VOCs sampling channels respectively correspond to three vehicle speed sections of low speed, medium speed and high speed, or respectively correspond to three tail gas flow sections of low speed, medium speed and high speed; in other embodiments, there may be more than three VOCs sampling channels, where the vehicle speed section/tail gas flow section corresponding to each of the sampling channels may be subdivided according to actual sampling requirements; because the polytetrafluoroethylene tube can bear positive pressure of 1.6Mpa and negative pressure of 77Kpa, is high-temperature resistant and low-temperature resistant (can be normally used at-60 ℃ to +260 ℃), has excellent chemical stability, and is reliable and excellent in corrosion resistance (inert to most chemicals and solvents and resistant to strong acid and strong alkali, water and various organic solvents), the material of the sampling pipeline 13 of the VOCs sampling channel of the embodiment is polytetrafluoroethylene;
the first sub-condition sampling controller 14 is configured to obtain a transient vehicle speed/tail gas flow from the auxiliary device 3, and control opening and closing of three VOCs sampling channels according to the obtained information; the inlet end of each VOCs sampling channel is communicated with the outlet end of the tail gas dilution system positioned at the front end of the sampling system through a first sub-working condition sampling controller, and the outlet end of each VOCs sampling channel is connected with a VOCs vacuum sampling tank 11; the in-tank environment of the VOCs vacuum sampling tank 11 is negative pressure relative to the ambient air pressure, so that sampling power can be provided; each VOCs sampling channel is also provided with a flow control valve 12 which is connected with the control host 4 and used for adjusting the sampling flow; a pressure gauge is arranged on each flow control valve 12 and is communicated with a sampling pipeline 13 of the VOCs sampling channel; after the VOCs vacuum sampling tank 11 is opened, the airtightness of the sampling pipeline of the VOCs sampling channel can be checked through the change of the pressure representation number;
the auxiliary device 3 may be a satellite navigation positioning system, and may provide a real-time vehicle speed for the first sub-condition sampling controller 14; the vehicle ECU data reading device may also be an automobile ECU data reading device, and may provide real-time vehicle speed/exhaust flow to the first split-condition sampling controller 14; the portable vehicle-mounted test system can also be a portable vehicle-mounted test system on the market, and can provide real-time vehicle speed/tail gas flow for the first sub-working condition sampling controller 14;
when the device works, the tail gas diluted by the tail gas dilution system (which is not part of the device and is the existing instrument, and the tail gas of the motor vehicle is required to be diluted in equal proportion before being sampled because of higher emission concentration of pollutants in the tail gas of the motor vehicle) enters three VOCs sampling channels from the air inlet of the split-working-condition VOCs off-line sampling device, and the VOCs in the tail gas are collected by the corresponding VOCs vacuum sampling tank 11, so that the simultaneous collection of three vehicle speed/tail gas flow sections is realized.
The split-working-condition PM and SVOCs off-line sampling instrument 2 comprises a particulate matter pre-classifier 28, a second split-working-condition sampling controller 27 connected with the control host 4, and three PM and SVOCs sampling channels which are arranged in parallel; the particle preseparator 28 in this example has a split size of 2.5 μm and allows at least 99% of the particles having a size of 1 μm to enter and pass through its outlet; the three PM and SVOCs sampling channels respectively correspond to three vehicle speed sections of low speed, medium speed and high speed, or respectively correspond to three tail gas flow sections of low speed, medium speed and high speed. In other embodiments, more than three PM and SVOCs sampling channels may be provided, where the respective vehicle speed section/exhaust flow section may be subdivided according to actual sampling requirements; because the carbon fiber tube has the advantages of high strength, corrosion resistance, fatigue resistance, creep resistance, conductivity (antistatic adsorption), small thermal expansion coefficient, energy absorption, earthquake resistance and the like, the materials of the sampling pipelines 23 of the PM and SVOCs sampling channels are carbon fiber tubes; the conductivity of the carbon fiber tube can prevent electrostatic adsorption of particles during transportation in the sampling pipeline;
the second sub-condition sampling controller 27 is used for acquiring transient vehicle speed/tail gas flow from the auxiliary equipment 3 and controlling the opening and closing of PM and SVOCs sampling channels according to the acquired information; the inlet end of each PM and SVOCs sampling channel is communicated with the outlet end of the particulate matter pre-classifier 28 through a second sub-working condition sampling controller, the inlet end of the particulate matter pre-classifier 28 is communicated with the outlet end of the tail gas dilution system positioned at the front end of the invention, all PM and SVOCs sampling channel outlets are converged on the same pipeline, a vacuum air pump 21 connected with a control host 4 is arranged on the pipeline, and the vacuum air pump 21 is used for providing sampling power; each PM and SVOCs sampling channel is also provided with a PM and SVOCs sampling unit 25 and a flow controller 22 which is connected with the control host 4 and used for adjusting the sampling flow, and the PM and SVOCs sampling unit 25 and the flow controller 22 are positioned between the particulate matter pre-classifier 28 and the vacuum air pump 21; the second sub-condition sampling controller 27 is connected with the control host 4;
the auxiliary device 3 may be a satellite navigation positioning system, and may provide a real-time vehicle speed for the second split-condition sampling controller 27; the vehicle ECU data reading device can also be used for providing real-time vehicle speed/tail gas flow for the second sub-condition sampling controller 27; the portable vehicle-mounted test system can also be a portable vehicle-mounted test system on the market, and can provide real-time vehicle speed/tail gas flow for the second split-working condition sampling controller 27; the first split-operating mode sampling controller 14 and the second split-operating mode sampling controller 27 may also share a set of auxiliary devices 3.
The PM and SVOCs sampling unit 25 includes a filter holder 251 provided with a particulate matter sampling filter and an SVOCs cartridge 252 provided with a PUF, which are sequentially arranged in the air flow direction;
considering that the phase distribution of SVOCs changes with the temperature change (for example, the gas-phase SVOCs is converted into the solid-phase SOVCs) when the gas-phase SVOCs and the solid-phase SVOCs change, the embodiment sets the PM and the SVOCs sampling units 25 on the three sampling channels of the split-working PM and the SVOCs off-line sampling device in the temperature control box 26 connected with the control host 4, and the temperature in the SVOCs sampling unit is kept constant in a certain range through the temperature control box 26, so as to avoid that the phase distribution of SVOCs changes with the temperature change after the SVOCs are sampled. In addition, the influence of different sampling temperatures on the SVOCs sampling result can be studied by changing the temperature in the temperature control box 26.
In order to realize the leak detection function of the sampling system and prevent sample gas loss, the embodiment is also provided with a pressure sensor 24 connected with the control host 4 on each PM and SVOCs sampling channel; the sampling line may be checked for air tightness prior to sampling.
In operation, the vacuum air pump 21 draws off-gas at a constant flow rate, the off-gas enters three PM and SVOCs sampling channels from the air inlet of the off-line PM and SVOCs sampling instrument 2, PM less than 2.5 μm in the off-gas is separated from the off-gas by the particulate matter pre-classifier 28 and is trapped on a particulate matter sampling filter membrane of known mass, and SVOCs is collected by the SVOCs filter cartridge 252 provided with a PUF, thereby realizing synchronous sampling of PM particulate matters and SVOCs in three vehicle speed/off-gas flow sections.
In addition, the control host 4 of the embodiment is provided with a touch display screen, is provided with sampling control software, has a man-machine interaction function, and can input sampling instructions such as sampling timing, time delay sampling, timing sampling, inquiring sampling data and the like through the touch display screen; the sampling sequence, the triggering parameters and the like can be set through the control host to realize the sampling control under different working conditions.
Claims (9)
1. The system for sampling the tail gas particulate matters and the volatile organic pollutants of the motor vehicle according to working conditions comprises a control host (4); the method is characterized in that: the system also comprises a split working condition VOCs off-line sampling instrument (1), a split working condition PM and SVOCs off-line sampling instrument (2) which are all connected with the control host (4);
the split-working-condition VOCs off-line sampling instrument (1) comprises a first split-working-condition sampling controller (14) and at least three VOCs sampling channels which are arranged in parallel; at least three VOCs sampling channels respectively correspond to three vehicle speed sections of low speed, medium speed and high speed, or respectively correspond to three tail gas flow sections of low speed, medium speed and high speed;
the first sub-working condition sampling controller (14) is used for acquiring transient vehicle speed/tail gas flow and controlling the opening and closing of the VOCs sampling channel according to the acquired information;
the inlet end of each VOCs sampling channel is communicated with the tail gas dilution system at the front end of the sampling system through a first sub-working condition sampling controller (14), and the outlet end of each VOCs sampling channel is connected with a VOCs vacuum sampling tank (11); each VOCs sampling channel is provided with a flow control valve (12) connected with the control host (4);
the split working condition PM and SVOCs off-line sampling instrument (2) comprises a particulate matter pre-classifier (28), a second split working condition sampling controller (27) and at least three PM and SVOCs sampling channels which are arranged in parallel; at least three PM and SVOCs sampling channels respectively correspond to three vehicle speed sections of low speed, medium speed and high speed, or respectively correspond to three tail gas flow sections of low speed, medium speed and high speed;
the second sub-working condition sampling controller (27) is used for acquiring transient vehicle speed/tail gas flow and controlling the opening and closing of the PM and SVOCs sampling channels according to the acquired information;
the inlet end of each PM and SVOCs sampling channel is communicated with the outlet end of the particulate matter pre-classifier (28) through a second sub-working condition sampling controller (27), the inlet end of the particulate matter pre-classifier (28) is communicated with the tail gas dilution system at the front end of the sampling system, the outlets of all PM and SVOCs sampling channels are provided with a vacuum air pump (21), or the outlets of all PM and SVOCs sampling channels are converged on the same pipeline, and the pipeline is provided with the vacuum air pump (21); the vacuum air pump (21) is connected with the control host (4);
each PM and SVOCs sampling channel is also provided with a PM and SVOCs sampling unit (25) and a flow controller (22) connected with the control host (4), and is positioned between the particulate matter pre-classifier (28) and the vacuum air pump (21);
the first sub-working condition sampling controller (14) and the second sub-working condition sampling controller (27) are connected with the control host (4).
2. The system for operating condition-based sampling of particulate matter and volatile organic contaminants in motor vehicle exhaust according to claim 1, wherein: and each PM and SVOCs sampling channel is also provided with a pressure sensor (24) connected with the control host (4).
3. The system for operating condition-based sampling of particulate matter and volatile organic contaminants in motor vehicle exhaust according to claim 2, wherein: all PM and SVOCs sampling units (25) are arranged in a temperature control box (26); the temperature control box (26) is connected with the control host (4).
4. A motor vehicle exhaust particulate matter and volatile organic contaminant sub-condition sampling system according to claim 3, wherein: and a sampling pipeline (13) of the VOCs sampling channel adopts a polytetrafluoroethylene tube.
5. The system for operating condition-based sampling of particulate matter and volatile organic contaminants in motor vehicle exhaust according to claim 4, wherein: and a sampling pipeline (23) of the PM and SVOCs sampling channels adopts carbon fiber pipes.
6. The system for operating condition-based sampling of particulate matter and volatile organic contaminants in motor vehicle exhaust according to claim 5, wherein: the particle pre-classifier (28) had a split particle size of 2.5 μm.
7. A motor vehicle exhaust particulate matter and volatile organic contaminant sub-condition sampling system according to any one of claims 1 to 6, wherein: three VOCs sampling channels are arranged;
the PM and SVOCs sampling channels are three.
8. A motor vehicle exhaust particulate matter and volatile organic contaminant sub-condition sampling system according to any one of claims 1 to 6, wherein: the PM and SVOCs sampling unit (25) comprises a filter membrane bracket (251) provided with a particulate matter sampling filter membrane and a SVOCs filter cartridge (252) provided with a PUF, which are sequentially arranged along the airflow direction.
9. The system for operating condition-based sampling of particulate matter and volatile organic contaminants in motor vehicle exhaust according to claim 1, wherein: the control host (4) has a man-machine interaction function.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711464910.5A CN108106887B (en) | 2017-12-28 | 2017-12-28 | System for sampling particulate matters and volatile organic pollutants in tail gas of motor vehicle according to working conditions |
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| CN201711464910.5A CN108106887B (en) | 2017-12-28 | 2017-12-28 | System for sampling particulate matters and volatile organic pollutants in tail gas of motor vehicle according to working conditions |
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Families Citing this family (5)
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| CN109490024A (en) * | 2018-11-27 | 2019-03-19 | 郑州大学 | A kind of vehicle exhaust VOC automatic acquisition device and the method for sampling stage by stage |
| CN110579379B (en) * | 2019-09-26 | 2021-11-09 | 同济大学 | Motor vehicle tail gas flexible sampling system and sampling method |
| CN113063636B (en) * | 2021-03-12 | 2022-08-05 | 北京大学 | Active atmospheric directional sampling device |
| CN113074994A (en) * | 2021-03-17 | 2021-07-06 | 南通大学 | Portable tail gas sampling device and using method thereof |
| CN113447404A (en) * | 2021-06-22 | 2021-09-28 | 北京理工大学 | Method for testing brake particulate matter emission of actual road motor vehicle |
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