CN102536406B - Particulate matter sensor and measurement method thereof - Google Patents
Particulate matter sensor and measurement method thereof Download PDFInfo
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- CN102536406B CN102536406B CN201210029484.3A CN201210029484A CN102536406B CN 102536406 B CN102536406 B CN 102536406B CN 201210029484 A CN201210029484 A CN 201210029484A CN 102536406 B CN102536406 B CN 102536406B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention relates to the technical field of tail gas emission control of vehicles, and discloses a particulate matter sensor. The particulate matter sensor is provided with a conductive shell, a cylindrical protective piece and a high-voltage electrode which is arranged in the conductive shell and is insulated from the conductive shell, wherein the conductive shell is grounded; the high-voltage electrode is connected with a high-voltage power supply; one end of the conductive shell is connected with one end of the protective piece in a sealed mode; and a tail gas inlet and a tail gas outlet are formed in the protective piece. A measurement method for the particulate matter sensor comprises the following steps of: grounding the conductive shell; applying high voltage onto the high-voltage electrode; allowing gas to be detected to flow through the clearance between the high-voltage electrode and the conductive shell, wherein particulate matters in the gas to be detected are ionized or polarized into conductors through the high-voltage electrode, and other matters in the gas to be detected are not ionized or polarized into the conductors; measuring leakage current, capacitance or resistance values between the high-voltage electrode and the conductive shell; and acquiring the concentration of the particulate matters in the gas to be detected according to a functional relation. The particulate matter sensor and the measurement method thereof are high in measurement accuracy; and the particulate matter sensor has long service life.
Description
Technical field
The present invention relates to the technical field that emission from vehicles is controlled, particularly a kind of particulate matter sensors and method of measurement thereof.
Background technique
Diesel-oil vehicle is at energy-conservation and CO
2the aspects such as reduction of discharging have certain advantage.The particulate matter of exhaust gas from diesel vehicle discharge simultaneously impacts human body and environment.Below granular material discharged middle PM2.5, account for 80%, and large particle is to be formed by little particle agglomeration.China is strengthening the detection of PM2.5 now, for formulating stricter Abgasgesetz, prepares.Current American-European countries on diesel-oil vehicle extensive use grain catcher (DPF) remove the most of particles in waste gas.The reliable regeneration of DPF system and failure monitor need to be used onboard diagnostic system (OBD).
OBD Abgasgesetz both domestic and external has stricter requirement in detection particle sensor function.California, USA has been formulated the OBD Abgasgesetz that starts execution for 2013, and the particulate matter limit value of passenger car and Light-duty Vehicle will drop to 17.5mg/mile (about 10.8mg/km).The draft about passenger car rules has been drafted by European Union, and emission standard divides three steps to implement, and 2014 reach 20mg/km, within 2016, reach 9mg/km, finally reach standard-required 4.5mg/km.China does not also formulate relevant OBD limit value rules.
Constantly strict along with OBD limit value rules; need novel particle sensor to monitor accurately the numerical value of PM; the research work of carrying out novel particle thing sensor in onboard diagnostic system has positive meaning to environmental protection and energy-saving and emission-reduction, can predict wide market prospects.
Germany Robert Bosch Co., Ltd (BOSCH), the enterprises such as Nippon Special ceramic Co., Ltd. (NTK) are all in research particulate matter sensors; The particulate matter sensors of BOSCH and NTK design is flat capacitor and resistance form, on a ceramic substrate, does many strip electrodes, and when particulate matter is through out-of-date, because particle concentration is different, interelectrode Capacity or resistance value change.Particulate matter constantly deposits at electrode surface, now the electrical quantity amount of sensor is actual is instantaneous particle concentration and the long-time stack depositing, and the impact that deposition produces is for a long time larger, this sensor will not have the effect of measuring instantaneous particle concentration, resolving accuracy does not reach 10mg/km, can not meet the requirement of controlling discharge.
Some particulate matter sensors is because inner sealing effect is poor, and while measuring the particulate matter in tail gas, the oxidize contaminants of some circuit leads, shell etc. will be adhered in gap, affects measuring accuracy and working life.Existing particulate matter sensors adopts spring compacting to seal to improve sealing effect, as shown in Figure 1, in US Patent No. 8047054 Particulate Matter Sensor, by measuring the lip-deep electromotive force of inductive rod 20 or potential change amount, detect particle concentration, between electric coupler 21 and base 19, spring 22 is set, spring 22 is by electric coupler 21 and the past extrapolation of base 19, to guarantee that electric coupler 21 and base 19 closely cooperate with outside, improve sealing.But spring is to be made by metallic material, at high temperature easily annealing, thereby can lose original hardness, and change telescopic spring, affected the sealing effect of total.Sealing will produce gas leak phenomenon after reducing, and the measured gas of high temperature flows into cable section and causes cable insulation to bear, thereby cannot go between; Even also there will be leaky, produce larger measurement error.
Summary of the invention
The technical problem to be solved in the present invention is: not high in order to overcome in prior art particulate matter sensors measuring accuracy, the deficiency that working life is shorter, the invention provides a kind of particulate matter sensors and method of measurement thereof, particulate matter sensors good sealing effect, long service life, employing high-field electrode is measured, and measuring accuracy is high.
The technical solution adopted for the present invention to solve the technical problems is: a kind of particulate matter sensors, have external conductive casing, tubular guard member, be arranged in external conductive casing and with the high-field electrode of external conductive casing insulation, for detection of the exhaust gas flow space of particle concentration with for the seal space of circuit is set, described external conductive casing ground connection, described high-field electrode is connected with high-voltage power, and the voltage of described high-voltage power is 800V～1500V; External conductive casing one end and guard member one end are tightly connected; described guard member is provided with tail gas import and tail gas outlet; the inner space of the guard member that described exhaust gas flow space is tubular and external conductive casing are near the inner space of tail gas import, and described seal space is that external conductive casing is away from the inner space of tail gas import and the space between high-field electrode.
The value principle of high-voltage power: contain different Matter Compositions in motor exhaust, and particulate matter is generally carbon granule; Through experiment, draw, high-field electrode is being applied under the condition of high voltage that voltage range is 800V～1500V, the particulate matter in tail gas is ionized or is polarized to conductor by high-field electrode, and other materials, for example steam, CO
2, do not have a significant impact, under this voltage, particle concentration is for affecting the principal element of leakage current; And under this voltage, the particulate matter after ionization will be assembled according to certain rules, thereby increase leakage current, reduce measurement error, improve precision.
Because physical dimension is less, between high-field electrode and external conductive casing, heating unit and each lead-in wire, gap can not be accomplished enough greatly, like this, except the gap existence of high-field electrode and external conductive casing exhaust gas flow is measured required leakage current, also have other leakage current, this will affect measuring accuracy.In order to improve measuring accuracy, high-field electrode is all carried out to electrode screening with external disturbance except being positioned at the part in exhaust gas flow space, described seal space is interior, high-field electrode is arranged with metal screen layer outward, described metal screen layer ground connection, and and high voltage electrode insulation.
Particulate matter all can deposit in institute is gapped, after deposition, leakage current will increase, when reaching certain thickness, sedimentary deposit will make particulate matter sensors cisco unity malfunction, therefore, in order to increase the service life, in described seal space, be provided with heater, described heater comprises heating unit, positive pole and negative pole, described heating unit is positioned at the one end near exhaust gas flow space, described minus earth, equal coated insulation and resistant to elevated temperatures separation layer on described heating unit, positive pole and negative pole, on heating unit, positive pole and negative pole, coated insolated layer materials is pottery.
The equal ground connection of negative pole of external conductive casing and heater, because the negative pole of heater and external conductive casing have a small pressure drop, the pressure drop that affects leakage current measurement in order to eliminate this, is provided with ground screen layer between the negative pole of described heater and external conductive casing.
The negative pole of described heater, external conductive casing and ground screen layer interconnect; Or according to circuit requirement, the negative pole of described heater interconnects and outwards independently draws wire with ground screen layer, and the negative pole of described heater and ground screen layer all insulate with external conductive casing.
Because deposition in gap increases, the resistance between metal screen layer and external conductive casing will diminish, and this resistance value is just in time as a mark post; In order to guarantee that sensor enters normal working again, also there is the resistance sensing control circuit for control heater start and stop, when the resistance between metal screen layer and the negative pole of ground screen layer or external conductive casing or heater is less than setting value, resistance sensing control circuit control heater starts.
In order to prevent that tail gas from receiving lead-in wire place by direct clearance, the gap in described seal space, between external conductive casing and heater seals by powder filler layer and/or metallic packing ring.
Poor in order to produce suction pressure, guarantee steady air inlet, described exhaust gas flow space is also provided with the outside guard member of tubular, described guard member one end, outside and external conductive casing one end are tightly connected, on the other end end face, offer for tail gas being imported to the outside inlet hole of guard member inside, outside, and described guard member has the bump stretching out with the end face of inlet hole one end, outside from outside guard member, described tail gas outlet is opened in guard member on the cylinder bottom surface of bump one end, external conductive casing is sleeved on guard member outside away from one end and the outside guard member of bump, guard member is sleeved on high-field electrode near the outside of tail gas import, described tail gas import is opened in guard member away from bump one end.
Due on high-field electrode with high voltage, therefore, in exhaust gas flow space, must reserve necessary gap and prevent from, when normal measuring state, between high-field electrode and external conductive casing, discharging.In order to prevent that particulate matter from entering the following part at position, heater place, extend the time of heater one action, described exhaust gas flow space and seal space joint are provided with mazy particulate matter stopper, described particulate matter stopper comprises for making the flow channel of particulate matter stopper form convex shoulder and the ring packing baffle plate in a plurality of turnings road, described convex shoulder is arranged in exhaust gas flow space, on high-field electrode outer surface near seal space place, described ring packing baffle plate is arranged on the external conductive casing internal surface of seal space near place, exhaust gas flow space.
A kind of method of measurement of particulate matter sensors: by external conductive casing ground connection, on high-field electrode, apply high voltage, voltage range is 800V～1500V, gas to be measured enters exhaust gas flow space from tail gas import, flow through the gap between high-field electrode and external conductive casing, particulate matter in gas to be measured is ionized or is polarized to conductor by high-field electrode, and other materials in gas to be measured do not have great changes, measure the leakage current between high-field electrode and external conductive casing, capacitance or resistance, according to the leakage current between high-field electrode and external conductive casing, the function relation of the concentration of capacitance or resistance and particulate matter draws the concentration of particulate matter in gas to be measured.
Resistance between the negative pole of metal screen layer and ground screen layer or external conductive casing or heater diminishes with the increase of the particulate matter depositing in gap, when the resistance between metal screen layer and the negative pole of ground screen layer or external conductive casing or heater is less than certain value, heating unit starts heating, seal space is heated up, the particulate matter of burnt deposit on seal space inwall.
High-field electrode electric discharge itself burns the particulate matter of deposition in exhaust gas flow space.
At different temperature, the corresponding particle concentration value of leakage current value is different; Because heater is idle when normal use, at this moment the resistance of heater has just represented the operating temperature of sensor, in order to guarantee to export correct particle concentration signal under different operating environment, according to the function relation of the leakage current recording under different temperatures, capacitance or resistance and particle concentration, using the resistance value of heater as the temperature transducer of measuring particulate matter sensors operating temperature, signal output apparatus is processed and compensation the output signal of particulate matter sensors by the resistance value size of HEATER FOR MEASURING.
Particulate matter sensors is from hot operation state to quitting work, temperature reduction can cause inner interstitial condensation, impact normal operation next time, in order to eliminate dewfall, when there is dewfall in the gap before particulate matter sensors enters normal working or in particulate matter sensors, control heater starts, and dewfall is evaporated.
The invention has the beneficial effects as follows, a kind of particulate matter sensors of the present invention and method of measurement thereof, obtain particle concentration by leakage current, capacitance or the resistance of measuring between high-field electrode, and measuring accuracy is high, and long service life also has the following advantages:
1, metal screen layer has not only been removed interference leakage current, and can also prevent that the pollutant of external oxidation corrosion from entering inner space and affecting measuring accuracy and working life;
2, bottom inflow, air outlet is positioned at outlet pipe center, suction port indentation one segment distance, generation suction pressure is poor, steadily air inlet, has greatly reduced the measurement fluctuation that brings the variation of particulate matter total amount to produce with engine exhaust quantitative change, obtains the particle concentration value in real tail gas;
3, tail gas is bent to and reaches seal space through multiple tracks, due to the effect of turning and the effect of electric field, has effectively prevented particulate matter deposition, extends the time of heater one action, increases work efficiency;
4, these two kinds of seal form of powder filler layer and metallic packing ring can be born high temperature, guarantee that tail gas can only flow in the scope requiring simultaneously, have also prevented that tail gas from taking heat to the afterbody of particulate matter sensors.
5, particulate matter all can deposit in institute is gapped, after deposition, leakage current will increase, and when sedimentary deposit reaches certain thickness, will make particulate matter sensors cisco unity malfunction, because deposition in gap increases, resistance between metal screen layer and external conductive casing will diminish, this resistance value is just in time as a mark post, and when little, during to a numerical value, heater work burns sediments, guaranteed that sensor occurrence enters normal working, extended the working life of particulate matter sensors;
6, at different temperature, the corresponding particle concentration value of leakage current value is different, because heater is idle when normally using, at this moment the resistance of heater has just represented the operating temperature of sensor, temperature transducer with heater as senor operating temperature, has guaranteed to export correct particle concentration signal under different operating environment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is US Patent No. 8047054 Particulate Matter Sensor embodiments' structural representation.
Fig. 2 is the optimum embodiment's of particulate matter sensors of the present invention structural representation.
Fig. 3 is the partial enlarged drawing at A place in Fig. 2.
Fig. 4 is that in particulate matter sensors of the present invention, gas flows to schematic diagram in exhaust gas flow space.
In Fig. 1 19, base, 20, inductive rod, 21, electric coupler, 22, spring.
Fig. 2, in Fig. 3 and Fig. 41, external conductive casing, 2-1, electrode suction cup, 2-2, electrode bar, 3, exhaust gas flow space, 4, seal space, 5, ground screen layer, 6, metal screen layer, 7, heating unit, 8, anodal, 9, negative pole, 10, separation layer, 11, powder filler layer, 12-1, the first metallic packing ring, 12-2, the second metallic packing ring, 12-3, the 3rd metallic packing ring, 13, outside guard member, 13-1, outside inlet hole, 14, guard member, 14-1, bump, 14-2, tail gas outlet, 14-3, tail gas import, 15-1, the first convex shoulder, 15-2, the second convex shoulder, 17, ceramic insulating layer, 18, flange collar, d, the spacing of flow channel.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, basic structure of the present invention is only described in a schematic way, so it only show the formation relevant with the present invention.
As shown in Figure 2 and Figure 3, the optimum embodiment's of particulate matter sensors of the present invention structural representation.Have external conductive casing 1, tubular guard member 14, be arranged in external conductive casing 1 and with the high-field electrode of external conductive casing 1 insulation, for detection of the exhaust gas flow space 3 of particle concentration with for the seal space 4 of circuit is set, described external conductive casing 1 ground connection, described high-field electrode is connected with high-voltage power, and the voltage of described high-voltage power is 800V～1500V; External conductive casing 1 one end and guard member 14 one end are tightly connected; described guard member 14 is provided with tail gas import 14-3 and tail gas outlet 14-2; the inner space of the guard member 14 that described exhaust gas flow space 3 is tubular and external conductive casing 1 are near the inner space of tail gas import 14-3, and described seal space 4 is that external conductive casing 1 is away from the inner space of tail gas import 14-3 and the space between high-field electrode.
High-field electrode is an electrode suction cup 2-1 in exhaust gas flow space 3 parts, and in seal space 4 parts, for being with externally threaded electrode bar 2-2, electrode suction cup 2-1 is threaded with electrode bar 2-2, and electrode bar 2-2 periphery is coated with one deck ceramic insulating layer 17.
Seal space 4 is interior, high-field electrode is arranged with metal screen layer 6 outward, metal screen layer 6 ground connection, and and high voltage electrode insulation.
In seal space 4, be provided with heater, heater comprises heating unit 7, positive pole 8 and negative pole 9, heating unit 7 is positioned at the one end near exhaust gas flow space 3, negative pole 9 ground connection, equal coated insulation and resistant to elevated temperatures separation layer 10 on heating unit 7, positive pole 8 and negative pole 9, on heating unit 7, positive pole 8 and negative pole 9, coated separation layer 10 materials are pottery.
Between the negative pole 9 of heater and external conductive casing 1, be provided with ground screen layer 5.
The negative pole 9 of heater, external conductive casing 1 and ground screen layer 5 interconnect; Or according to circuit requirement, the negative pole 9 of described heater and ground screen layer 5 interconnect and outwards independently draw wire, and the negative pole 9 of described heater and ground screen layer 5 all insulate with external conductive casing 1.
Also have the resistance sensing control circuit for control heater start and stop, when the resistance between metal screen layer 6 and ground screen layer 5 is less than certain value, resistance sensing control circuit control heater starts.
Gap in seal space 4, between external conductive casing 1 and heater seals by powder filler layer 11 and/or metallic packing ring: the first metallic packing ring 12-1 is set on the surface of contact of the ceramic insulating layer 17 in electrode suction cup 2-1 and seal space; The internal surface of the separation layer 10 of heater is provided with flange collar 18, and the ceramic insulating layer 17 of electrode bar 2-2 periphery arranges the groove matching with flange collar 18, in flange collar 18, is provided with the second metallic packing ring 12-2 and the 3rd metallic packing ring 12-3 with groove fit place; The gap location of the heater in seal space 4 and external conductive casing 1 is provided with powder filler layer 11.
Exhaust gas flow space 3 is also provided with the outside guard member 13 of tubular, guard member 13 one end, outside and external conductive casing 1 one end are tightly connected, on the other end end face, offer for tail gas being imported to the outside inlet hole 13-1 of guard member 13 inside, outside, and guard member 14 has the bump 14-1 stretching out with the end face of inlet hole 13-1 one end, outside from outside guard member 13, tail gas outlet 14-2 is opened in guard member 14 on the cylinder bottom surface of bump 14-1 one end, external conductive casing 1 is sleeved on guard member 14 outsides away from one end and the outside guard member 13 of bump 14-1, guard member 14 is sleeved on high-field electrode near the outside of tail gas import 14-3, tail gas import 14-3 is opened in guard member 14 away from bump 14-1 one end, tail gas import 14-3 is circular hole, circumference uniform distribution in guard member 14.
Exhaust gas flow space 3 is provided with mazy particulate matter stopper with seal space 4 joints, particulate matter stopper comprises for making the flow channel of particulate matter stopper form convex shoulder 15 and the ring packing baffle plate 16 in a plurality of turnings road, convex shoulder 15 is arranged on the high-field electrode outer surface in exhaust gas flow space 3, near seal space 4 places, and ring packing baffle plate 16 is arranged on external conductive casing 1 internal surface of seal space 4 near 3 places, exhaust gas flow space.
The flow direction of gas in exhaust gas flow space as shown in Figure 4.Tail gas to be measured enters in the gap of outside guard member 13 and guard member 14 from outside inlet hole 13-1, flow to the gap between external conductive casing 1 and guard member 14, by tail gas import 14-3, enter subsequently the gap of guard member 14 and electrode suction cup 2-1, be divided into two bursts of glide paths, most of tail gas to be measured flows toward the cephalad direction of particulate matter sensors, and from tail gas outlet, 14-2 flows out; There is in addition sub-fraction tail gas to be measured that the caudal directions toward particulate matter sensors is flowed, enter particulate matter stopper.
A kind of method of measurement of particulate matter sensors: by external conductive casing 1 ground connection, on high-field electrode, apply high voltage, voltage range is 800V～1500V, gas to be measured enters exhaust gas flow space 3 from tail gas import 14-3, flow through the gap of 1 of high-field electrode and external conductive casing, particulate matter in gas to be measured is ionized or is polarized to conductor by high-field electrode, and other materials in gas to be measured do not have great changes, measure the leakage current between high-field electrode and external conductive casing 1, capacitance or resistance, according to the leakage current between high-field electrode and external conductive casing 1, the function relation of the concentration of capacitance or resistance and particulate matter draws the concentration of particulate matter in gas to be measured.Leakage current, capacitance or resistance between high-field electrode and external conductive casing 1 and the function relation of particle concentration draw according to experiment, in experiment, particle concentration value is by laser particle substrate concentration ANALYZER (AVL 483 Micro Soot Sensor, AVL Liszt company produces) measure, the leakage current value then particle concentration value and particulate matter sensors of the present invention being recorded or capacitance or resistance described point picture draw function relation.
Resistance between metal screen layer 6 and ground screen layer 5 diminishes with the increase of the particulate matter depositing in gap, when the resistance between metal screen layer 6 and ground screen layer 5 is less than certain value, heating unit 7 starts heating, seal space 4 is heated up, the particulate matter of burnt deposit on seal space 4 inwalls.
High-field electrode electric discharge itself burns the particulate matter of exhaust gas flow space 3 interior depositions.
According to the function relation of the leakage current recording under different temperatures, capacitance or resistance and particle concentration, using the resistance value of heater as the temperature transducer of measuring particulate matter sensors operating temperature, signal output apparatus is processed and compensation the output signal of particulate matter sensors by the resistance value size of HEATER FOR MEASURING.
Particulate matter sensors is from hot operation state to quitting work, temperature reduction can cause inner interstitial condensation, impact normal operation next time, in order to eliminate dewfall, when there is dewfall in the gap before particulate matter sensors enters normal working or in particulate matter sensors, control heater starts, and dewfall is evaporated.
The above-mentioned foundation desirable embodiment of the present invention of take is enlightenment, and by above-mentioned description, relevant staff can, within not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to claim scope.
Claims (10)
1. a particulate matter sensors, it is characterized in that: there is external conductive casing (1), the guard member of tubular (14), be arranged in external conductive casing (1) and with the high-field electrode of external conductive casing (1) insulation, for detection of the exhaust gas flow space (3) of particle concentration with for the seal space (4) of circuit is set, described external conductive casing (1) ground connection, described high-field electrode is connected with high-voltage power, the voltage of described high-voltage power is 800V～1500V, external conductive casing (1) one end and guard member (14) one end are tightly connected, described guard member (14) is provided with tail gas import (14-3) and tail gas outlet (14-2), the inner space of the guard member (14) that described exhaust gas flow space (3) is tubular and external conductive casing (1) are near the inner space of tail gas import (14-3), described seal space (4) is that external conductive casing (1) is away from the inner space of tail gas import (14-3) and the space between high-field electrode, described exhaust gas flow space (3) is also provided with the outside guard member (13) of tubular, described outside guard member (13) one end and external conductive casing (1) one end are tightly connected, on the other end end face, offer for tail gas being imported to the inner outside inlet hole (13-1) of outside guard member (13), and described guard member (14) has the bump (14-1) stretching out with the end face of outside inlet hole (13-1) one end from outside guard member (13), described tail gas outlet (14-2) is opened in guard member (14) on the cylinder bottom surface of described bump (14-1) one end, external conductive casing (1) is sleeved on guard member (14) outside away from one end and the outside guard member (13) of described bump (14-1), guard member (14) is sleeved on high-field electrode near the outside of tail gas import (14-3), described tail gas import (14-3) is opened in guard member (14) away from described bump (14-1) one end.
2. a kind of particulate matter sensors as claimed in claim 1, it is characterized in that: described seal space is provided with heater in (4), described heater comprises heating unit (7), anodal (8) and negative pole (9), described heating unit (7) is positioned at the one end near exhaust gas flow space (3), described negative pole (9) ground connection, the upper equal coated insulation of described heating unit (7), anodal (8) and negative pole (9) and resistant to elevated temperatures separation layer (10).
3. a kind of particulate matter sensors as claimed in claim 2, is characterized in that: between the negative pole of described heater (9) and external conductive casing (1), be provided with ground screen layer (5).
4. a kind of particulate matter sensors as claimed in claim 3, is characterized in that: the negative pole of described heater (9), external conductive casing (1) and ground screen layer (5) interconnect.
5. a kind of particulate matter sensors as claimed in claim 3, it is characterized in that: the negative pole of described heater (9) interconnects and is communicated with external circuit by wire with ground screen layer (5), the negative pole of described heater (9) and ground screen layer (5) all insulate with external conductive casing (1).
6. a kind of particulate matter sensors as claimed in claim 1, is characterized in that: the gap in described seal space (4), between external conductive casing (1) and heater is by powder filler layer (11) and/or metallic packing ring sealing.
7. a kind of particulate matter sensors as claimed in claim 1, it is characterized in that: described exhaust gas flow space (3) is provided with mazy particulate matter stopper with seal space (4) joint, described particulate matter stopper comprises for making the flow channel of particulate matter stopper form convex shoulder (15) and the ring packing baffle plate (16) in a plurality of turnings road, described convex shoulder (15) is arranged in exhaust gas flow space (3), on the high-field electrode outer surface of locating near seal space (4), described ring packing baffle plate (16) is arranged on external conductive casing (1) internal surface of locating in the close exhaust gas flow space (3) of seal space (4).
8. the method for measurement of the particulate matter sensors as described in any one in claim 1 to 7, it is characterized in that: by external conductive casing (1) ground connection, on high-field electrode, apply high voltage, voltage range is 800V～1500V, gas to be measured enters exhaust gas flow space (3) from tail gas import (14-3), flow through the gap between high-field electrode and external conductive casing (1), particulate matter in gas to be measured is ionized or is polarized to conductor by high-field electrode, and other materials in gas to be measured are not ionized or are polarized to conductor, measure the leakage current between high-field electrode and external conductive casing (1), capacitance or resistance, according to the leakage current between high-field electrode and external conductive casing (1), the function relation of the concentration of capacitance or resistance and particulate matter draws the concentration of particulate matter in gas to be measured.
9. the method for measurement of particulate matter sensors as claimed in claim 8, it is characterized in that: according to the function relation of the leakage current recording under different temperatures, capacitance or resistance and particle concentration, using the resistance value of heater as the temperature transducer of measuring particulate matter sensors operating temperature, signal output apparatus is processed and compensation the output signal of particulate matter sensors by the resistance value size of HEATER FOR MEASURING.
10. the method for measurement of particulate matter sensors as claimed in claim 8, is characterized in that: when there is dewfall in the gap before particulate matter sensors enters normal working or in particulate matter sensors, control heater starts.
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| CN102536407B (en) * | 2012-02-10 | 2013-12-18 | 金坛鸿鑫电子科技有限公司 | Particulate matter sensor with improved measurement accuracy |
| US9606038B2 (en) * | 2012-05-21 | 2017-03-28 | Shimadzu Corporation | Particle count measurement device |
| JP6329820B2 (en) * | 2014-06-16 | 2018-05-23 | 株式会社Ｓｏｋｅｎ | Particulate matter detection sensor |
| CN104849186B (en) * | 2015-01-30 | 2017-11-17 | 江苏大学 | A kind of method that calibration system of particulate matter sensors measures |
| DE102015016820A1 (en) * | 2015-12-22 | 2017-06-22 | Testo SE & Co. KGaA | Particles measuring arrangement |
| US10267204B2 (en) * | 2016-03-07 | 2019-04-23 | Ford Global Technologies, Llc | Method and system for exhaust particulate matter sensing |
| CN105572010A (en) * | 2016-03-21 | 2016-05-11 | 金坛华诚电子有限公司 | Particulate matter sensor |
| CN106762061B (en) * | 2016-12-07 | 2020-03-31 | 江苏大学 | Diagnostic device and method for simulating DPF failure |
| CN106840982B (en) * | 2017-04-13 | 2024-02-02 | 常州华诚电子有限公司 | Particulate matter sensor |
| JP7353860B2 (en) * | 2019-02-04 | 2023-10-02 | 日置電機株式会社 | sensor |
| CN114543711B (en) * | 2022-01-23 | 2023-08-25 | 中南大学 | Sensing data processing method of gas distance measurement system |
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| EP2385361A2 (en) * | 2010-04-16 | 2011-11-09 | NGK Insulators, Ltd. | Particulate matter detecting device |
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