CN212483260U - Vehicle-mounted tail gas particulate matter detection device and system - Google Patents
Vehicle-mounted tail gas particulate matter detection device and system Download PDFInfo
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- CN212483260U CN212483260U CN202020634103.4U CN202020634103U CN212483260U CN 212483260 U CN212483260 U CN 212483260U CN 202020634103 U CN202020634103 U CN 202020634103U CN 212483260 U CN212483260 U CN 212483260U
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Abstract
The utility model provides a vehicle-mounted exhaust particulate matter detection device and system, vehicle-mounted exhaust particulate matter detection device includes sampling light room main part, wherein, sampling light room main part includes: the light channel is provided with a light inlet at one end and a light outlet at the other end; and the tail gas channel is communicated with the optical channel in an intersecting manner and is used for the circulation of the detected vehicle-mounted tail gas. The utility model provides an on-vehicle tail gas particulate matter detection device and system of optics principle, tail gas particulate matter concentration that can real-time measurement diesel vehicle emission, the precision is high, and is high temperature resistant to have the function of sweeping, be suitable for on-vehicle tail gas emission real-time measurement's application very much.
Description
Technical Field
The utility model relates to a tail gas monitoring facilities technical field especially relates to an on-vehicle tail gas particulate matter detection device and system.
Background
In recent years, with the continuous acceleration of industrial development and urbanization process, the atmospheric pollution condition is continuously intensified, and the haze weather becomes a normality. The exceeding-standard particles in the atmosphere have great harm to the health of people. Research shows that mobile pollution sources such as automobiles and the like are important sources of air pollution. Diesel trucks are the larger household of mobile pollution sources. In 2019, 7 months, the ecological environment part implements new standards of emission limits of pollutants of GB17691-2018 heavy-duty diesel vehicles and a measurement method (sixth stage of China). Standards require that heavy duty diesel vehicles must be equipped with on-board emission diagnostic OBD systems to measure and diagnose vehicle emission levels in real time. In order to realize the purpose of vehicle-mounted real-time monitoring, a vehicle-mounted exhaust particulate matter sensor is particularly important. However, the vehicle-mounted exhaust particulate matter sensor on the market at present cannot well reach the technical level required by the standard. For example, the conventional bosch exhaust particulate matter sensor adopts a leakage current mode to detect, measures the amount of accumulated particulate matter in a period of time instead of real-time concentration, and has lower precision. The method is only suitable for judging whether the tail gas filtering device is invalid or not and cannot be used for detecting the real-time value of the exhaust particulate matter emission.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is directed to a vehicle-mounted exhaust particulate detection device and system, so as to at least partially solve at least one of the above-mentioned technical problems.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
as an aspect of the utility model provides a vehicle-mounted exhaust particulate matter detection device, including the sampling light room main part, wherein, the sampling light room main part includes:
the light channel is provided with a light inlet at one end and a light outlet at the other end;
and the tail gas channel is communicated with the optical channel in an intersecting manner and is used for the circulation of the detected vehicle-mounted tail gas.
As another aspect of the utility model, still provide an on-vehicle tail gas particulate matter detecting system, include:
the vehicle-mounted exhaust particulate matter detection device is described above;
the circuit board comprises a light source, a detector and a control and processing circuit;
the light source is used for providing measuring light, the measuring light enters the light channel from the light inlet, passes through the tail gas channel and then exits from the light outlet;
the detector is used for detecting the light intensity of the measuring light emitted from the light outlet, and performing photoelectric signal conversion and detection signal output;
and the control and processing circuit is used for driving and controlling the light source and the detector, receiving and processing detection signals of the detector and obtaining a vehicle-mounted tail gas particulate matter concentration result.
Based on above-mentioned technical scheme, the utility model discloses compare in prior art and have following beneficial effect one of them or one of them part at least:
1. the vehicle-mounted tail gas particulate matter measurement based on the optical principle is realized, and the real-time performance and the precision are high;
2. the sampling optical chamber main body is designed to automatically purge, so that the measurement accuracy can be kept, and the service life is prolonged;
3. the side wall part of the tail gas channel adopts the design of ultrathin parallel plates, so that constant-speed sampling of tail gas is realized, sampling and measurement are more accurate, the emission resistance is reduced to the maximum extent, and the oil consumption of the vehicle is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a vehicle-mounted exhaust particulate matter detection device and system according to an embodiment of the present invention;
fig. 2 is a schematic top view of a sampling light chamber body according to an embodiment of the present invention;
fig. 3 is a left schematic view of the sampling light chamber main body in the embodiment of the present invention;
fig. 4 is the utility model discloses on-vehicle exhaust particulate matter detecting system measures flow chart in the embodiment.
In the above figures, the reference numerals have the following meanings:
1101-an exhaust pipe; 1201-sampling the optical chamber body; 1202-optical channel; 1203-exhaust gas channel; 1204. 1205-side wall; 1206. a light inlet; 1207-first lens; 1211-a second lens; 1208. 1213-lens mounting component; 1209. 1212-purge gas inlet; 1210. a light outlet; 1214-measuring light; 1301-a receiving fiber; 1302-a transmitting optical fiber; 1303. 1304-purge gas circuit; 1401-an outer shell; 1402-a circuit board; 1403-electric control valve; 1404 — a transmit interface; 1405-receive interface; 1406-an electronic control interface; 1407. 1408-fast gas path interface; 1409-a gas source inlet interface; 1410-a filter; 1411-a third lens; 1501-vehicle OBD diagnosis terminal; 1502-external air supply.
Detailed Description
The utility model provides an utilize on-vehicle tail gas particulate matter detection device and system of optics principle, the tail gas particulate matter concentration that can real-time measurement diesel vehicle emission, the precision is higher, and is high temperature resistant to have the function of sweeping, be suitable for on-vehicle tail gas emission real-time measurement's application very much.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
As one aspect of the present invention, as shown in fig. 1 and 2, a vehicle-mounted exhaust particulate detection device is provided, which includes a sampling optical chamber main body 1201; wherein the sampling optical chamber main body 1201 includes: a light channel 1202, a light inlet 1206 is arranged at one end of the light channel 1202, and a light outlet 1210 is arranged at the other end of the light channel 1202; and an exhaust channel 1203 intersecting and communicating with the optical channel 1202 and used for circulating the detected vehicle-mounted exhaust.
In an embodiment of the present invention, as shown in fig. 1 and 3, the exhaust channel 1203 is a slot-shaped hole structure, which includes two side walls 1204, 1205 arranged in parallel along the extending direction of the light channel 1202; the wall thickness of the two side walls 1204, 1205 is less than 0.5 mm; the edges of the two side walls 1204, 1205 are knife-edged.
In the embodiment of the present invention, as shown in fig. 1 and fig. 2, the exhaust channel 1203 of the sampling light chamber main body 1201 is partially disposed in a detected vehicle-mounted exhaust pipe 1101; the exhaust gas passage 1203 extends in the same direction as the exhaust direction of the exhaust pipe 1101.
More specifically, the detected vehicle-mounted exhaust gas is discharged from the exhaust pipe 1101 to the outside, and intersects the light tunnel 1202 through the exhaust gas tunnel 1203. The exhaust channel 1203 is a slot-shaped hole structure, the outer contour of the corresponding side wall 1204, 1205 is flattened to form a parallel thin layer; and the edges of the side walls 1204, 1205 are knife-edged due to the intersection of the outer profile and the slot-shaped aperture structure. The utility model discloses a this kind of design is the constant speed sampling, makes the tail gas concentration that gets into exhaust passage 1203 can not take place the sudden change, and is the same with the tail gas concentration outside exhaust passage 1203. In addition, the smaller the wall thickness of the side walls 1204 and 1205 is, the smaller the influence of the sampling light chamber main body 1201 on the exhaust emission resistance is, and the increase of the vehicle oil consumption caused by the overlarge sampling resistance is avoided. However, the walls 1204, 1205 are preferably less than 0.5mm thick due to tooling and mechanical strength considerations.
In the embodiment of the present invention, the extending direction of the optical channel 1202 is parallel to the axial direction of the sampling optical chamber main body 1201, and the optical channel 1202 and the sampling optical chamber main body 1201 are coaxially arranged; the exhaust channel 1203 is perpendicularly intersected and communicated with the optical channel 1202.
In an embodiment of the present invention, as shown in fig. 1 and fig. 2, the vehicle-mounted exhaust particulate matter detection device further includes two optical lenses; one of the optical lenses is disposed in the light channel 1202 at the light inlet 1206, defined as a first lens 1207; another optical lens is disposed at the light exit 1210 in the light channel, and is defined as a second lens 1211.
The measurement light 1214 becomes a strictly parallel beam entering the light tunnel 1202 after being collimated by the first lens 1207. The light beam passes through the exhaust passage 1203 and then irradiates the second lens 1211. The second lens 1211 condenses the parallel light into the optical fiber, increasing the intensity of the received light.
In addition, it is worth mentioning that lens mounting members 1208 and 1213, which are cylindrical bodies having the same size as the inner diameter of the sampling light chamber main body 1201, are provided on the sampling light chamber main body 1201, for fixing the light lens, maintaining partial sealing, and interfacing the light passage 1202 with the light inlet 1206 or the light outlet 1210.
In the embodiment of the present invention, as shown in fig. 1, two purge gas inlets 1209, 1212 are further disposed on the sampling optical chamber main body 1201, the two purge gas inlets 1209, 1212 are respectively disposed near the two optical lenses, and the two purge gas inlets 1209, 1212 are respectively communicated with the exhaust gas channel 1203.
During purging, the contaminants in the first lens 1207, the second lens 1211 and the sampling light chamber main body 1201 are purged to the exhaust passage 1203 and discharged. The measurement precision can be effectively guaranteed and the service life can be prolonged by utilizing the sweeping gas for sweeping.
In the embodiment of the present invention, as shown in fig. 3, the sampling light chamber main body 1201 is a cylinder, but is not limited thereto, and in other embodiments of the present invention, the sampling light chamber main body 1201 may also be a square column; the sampling light chamber main body 1201 is made of stainless steel. The sampling light chamber main body 1201 is made of high-temperature-resistant and anti-corrosion materials, so that the service life is prolonged.
As another aspect of the utility model, as shown in fig. 1, still provide an on-vehicle tail gas particulate matter detecting system, include: the vehicle-mounted exhaust particulate matter detection device is described above; a circuit board 1402, the circuit board 1402 including a light source, a detector, and a control and processing circuit; a light source for providing measuring light 1214, wherein the measuring light 1214 enters the light channel 1202 from the light inlet 1206, passes through the exhaust channel 1203 and then exits from the light outlet 1210; a detector for detecting the intensity of the measuring light emitted from the light outlet 1210, and performing photoelectric signal conversion and detection signal output; and the control and processing circuit is used for driving and controlling the light source and the detector, receiving and processing detection signals of the detector and obtaining a vehicle-mounted tail gas particulate matter concentration result. And the vehicle-mounted diagnosis terminal 1501 is used for receiving the vehicle-mounted exhaust particulate matter concentration signal transmitted by the circuit board 1402.
The principle of the present invention is that the light source emits measuring light 1214 to irradiate into the light channel 1202, and after passing through the tail gas channel 1203, the measuring light is received by the detector; when passing through the exhaust gas channel 1203, the particulate matters in the exhaust gas have certain influence on the light intensity due to absorption and scattering effects, namely attenuation is performed, and the higher the concentration of the particulate matters in the exhaust gas is, the larger the influence is.
The circuit board 1402 controls the light intensity and the period of the light source emitting the measuring light 1214, and modulates the measuring light 1214 (laser in the embodiment of the present invention). In an embodiment of the present invention, the modulation frequency of the light source is 200 Hz. By using modulated light, errors caused by dark current and ambient light can be avoided. The signal peak-to-valley value of the attenuated light beam is reduced, and the attenuation degree and the concentration of the peak-to-valley value meet the Lambert beer law. The exhaust gas particulate matter concentration can be calculated according to the attenuation degree of the light.
In an embodiment of the present invention, the light source may be a laser diode; the detector may be a photodetector (not shown); the laser diode and the photodetector are respectively disposed on the circuit board 1402; the laser diode and the photodetector are connected to the light inlet 1206 and the light outlet 1210 through the transmitting optical fiber 1302 and the receiving optical fiber 1301, respectively.
More specifically, the circuit board 1402 is disposed in the housing 1401, and the housing 1401 is provided with a transmitting interface 1404 and a receiving interface 1405; a third lens 1411 is disposed within the housing 1401 at the alignment emission interface 1404, and the laser diode focuses the laser beam through the third lens 1411 into the inner core of the emission fiber 1302 and ultimately to the sample light chamber body 1201. The third lens 1411 can improve the utilization rate of the light source and the on-state light intensity in the optical fiber. The laser beam passes through the tail gas channel 1203 and then is transmitted to a detector through a receiving optical fiber 1301; wherein the received light on the housing 1401 is coupled to the detector via the receiving interface 1405.
An electric control interface 1406 is further arranged on the shell 1401, and the electric control interface 1406 comprises a power line and a communication line; the cable connected to the circuit board 1402 is connected to the on-board OBD diagnostic terminal 1501 through the electronic control interface 1406.
In the embodiment of the present invention, as shown in fig. 1, the vehicle-mounted exhaust particulate matter detection system further includes an electronic control valve 1403, a filter 1410 and an external air source 1502;
an external gas source 1502 connected to purge gas inlets 1209, 1212 through piping; the electronic control valve 1403 is arranged on the pipeline, wherein the opening and closing of the electronic control valve 1403 are controlled through the circuit board 1402; a filter 1410 is provided in the line between the external gas source 1502 and the electrically controlled valve 1403.
More specifically, the external air source 1502 is a device capable of providing pressurized air flow, such as an air storage tank, an air pump, and the like, and the external air source 1502 is in butt joint with a pipeline in the shell 1401 through an air source inlet interface 1409; a filter 1410 is provided between the external gas source 1502 and the gas source inlet interface 1409 for filtering larger particles in the purge gas and protecting the electrically controlled valve 1403 and the sampling light chamber body 1201 from contamination.
The electronic control valve 1403 is arranged on a pipeline in the shell 1401, and the pipeline in the shell 1401 forms two purge gas pipelines 1303 and 1304 through two quick gas pipeline interfaces 1407 and 1408 arranged on the shell 1401 and is respectively connected with two purge gas inlets 1209 and 1212; that is, when the electronic control valve 1403 is turned on, the purge gas reaches the sampling optical chamber main body 1201 from the external gas source 1502 through the filter 1410, the electronic control valve 1403 and the two purge gas paths 1303 and 1304, and is purged.
The utility model discloses in the on-vehicle tail gas particulate matter detecting system of embodiment, as shown in FIG. 4, its detection method flow includes: the laser diode in the circuit board 1402 emits a sine wave modulated laser beam that is coupled into the transmit fiber 1302 through the third lens 1411 and the transmit interface 1404 and then conducted to the optical inlet 1206. The laser beam is collimated by the first lens 1207 and the collimated beam passes through the exhaust channel 1203 to the second lens 1211 as the measurement light 1214. The second lens 1211 converges light, transmits the light to a photoelectric detector on the circuit board 1402 through the receiving optical fiber 1301 and the receiving interface 1405, the photoelectric detector converts a light signal into a current signal and transmits the current signal to a control and processing circuit of the circuit board 1402, the control and processing circuit converts the current signal into a voltage signal and amplifies the voltage signal, the voltage signal is finally converted into a digital signal, the peak and valley value after light attenuation is calculated according to the digital signal, the peak and valley value of an effective light intensity signal is detected in real time according to a calibrated light intensity peak and valley value, and the concentration of particles in the tail gas is finally obtained by utilizing the lambert beer law. And then transmitted to the on-board OBD diagnosis terminal through communication. The functions of the control and processing circuit can be realized based on conventional hardware such as a single chip microcomputer and conventional software programming, so the utility model discloses do not relate to the improvement on procedure.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a vehicle-mounted exhaust particulate matter detection device which characterized in that, includes sampling light room main part, wherein, sampling light room main part includes:
the light channel is provided with a light inlet at one end and a light outlet at the other end;
the tail gas channel is communicated with the optical channel in an intersecting manner and is used for the circulation of the detected vehicle-mounted tail gas;
the extending direction of the optical channel is parallel to the axial direction of the sampling optical chamber main body, and the optical channel and the sampling optical chamber main body are coaxially arranged; the tail gas channel is vertically intersected and communicated with the optical channel.
2. The vehicle-mounted exhaust particulate matter detection device according to claim 1, wherein the exhaust channel is a slot-shaped hole structure, and the slot-shaped hole structure comprises two side walls arranged in parallel along an extension direction of the light channel;
the wall thickness of the side wall is less than 0.5 mm;
the edge of the side wall is in a blade shape.
3. The vehicle-mounted exhaust particulate detection device according to claim 1, wherein the exhaust passage of the sampling light chamber body is partially disposed in a detected vehicle-mounted exhaust pipe; the extending direction of the tail gas channel is the same as the exhaust direction of the exhaust pipe.
4. The vehicle-mounted exhaust particulate matter detection device according to claim 1, further comprising two optical lenses; one of the optical lenses is disposed at a light inlet in the light channel, and the other optical lens is disposed at a light outlet in the light channel.
5. The vehicle-mounted exhaust particulate matter detection device according to claim 4, wherein two purge gas inlets are provided on the sampling optical chamber body, the two purge gas inlets are respectively provided near the two optical lenses, and the two purge gas inlets are respectively communicated with the exhaust passage.
6. The vehicle-mounted exhaust particulate matter detection device according to claim 1, wherein the sampling light chamber body is cylindrical or square-column;
the sampling light chamber main body is made of stainless steel.
7. The utility model provides an on-vehicle tail gas particulate matter detecting system which characterized in that includes:
the vehicle-mounted exhaust particulate matter detection device according to any one of claims 1 to 6;
the circuit board comprises a light source, a detector and a control and processing circuit;
the light source is used for providing measuring light, the measuring light enters the light channel from the light inlet, passes through the tail gas channel and then exits from the light outlet;
the detector is used for detecting the light intensity of the measuring light emitted from the light outlet, and performing photoelectric signal conversion and detection signal output;
and the control and processing circuit is used for driving and controlling the light source and the detector, receiving and processing detection signals of the detector and obtaining a vehicle-mounted tail gas particulate matter concentration result.
8. The vehicle exhaust particulate matter detection system according to claim 7, further comprising an electronic control valve, a filter and an external air source;
the external air source is connected with a purge gas inlet arranged on the sampling light chamber main body through a pipeline;
the electronic control valve is arranged on the pipeline, wherein the opening and closing of the electronic control valve are driven and controlled through the circuit board;
and the filter is arranged on a pipeline between the external air source and the electric control valve.
9. The vehicle-mounted exhaust particulate matter detection system of claim 7, wherein the light source is a laser diode; the detector is a photoelectric detector; the laser diode and the photoelectric detector are respectively connected with the light inlet and the light outlet through optical fibers;
the vehicle-mounted exhaust particulate matter detection system further comprises a vehicle-mounted diagnosis terminal used for receiving the vehicle-mounted exhaust particulate matter concentration signal transmitted by the circuit board.
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| CN202020634103.4U CN212483260U (en) | 2020-04-23 | 2020-04-23 | Vehicle-mounted tail gas particulate matter detection device and system |
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| CN202020634103.4U CN212483260U (en) | 2020-04-23 | 2020-04-23 | Vehicle-mounted tail gas particulate matter detection device and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418840A (en) * | 2021-06-22 | 2021-09-21 | 西石(厦门)科技股份有限公司 | Gas detection device and vehicle-mounted tail gas detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418840A (en) * | 2021-06-22 | 2021-09-21 | 西石(厦门)科技股份有限公司 | Gas detection device and vehicle-mounted tail gas detection system |
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