CN114755019A - Sensor, engine exhaust gas treatment system, control method of engine exhaust gas treatment system, and vehicle - Google Patents
Sensor, engine exhaust gas treatment system, control method of engine exhaust gas treatment system, and vehicle Download PDFInfo
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- CN114755019A CN114755019A CN202110032090.2A CN202110032090A CN114755019A CN 114755019 A CN114755019 A CN 114755019A CN 202110032090 A CN202110032090 A CN 202110032090A CN 114755019 A CN114755019 A CN 114755019A
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- 238000000034 method Methods 0.000 title claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 45
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 43
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000002808 molecular sieve Substances 0.000 claims description 8
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 8
- 230000003197 catalytic effect Effects 0.000 claims description 5
- 239000002250 absorbent Substances 0.000 claims 1
- 239000000306 component Substances 0.000 description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102220500397 Neutral and basic amino acid transport protein rBAT_M41T_mutation Human genes 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/104—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using oxygen or lambda-sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1494—Control of sensor heater
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The sensor comprises an inner air guide (11) and an outer air guide (12) which are coaxially arranged, and a measuring assembly (13) fixed in an inner cavity of the inner air guide (11), wherein a water absorption coating is coated on the outer wall of the inner air guide (11) and/or the inner wall of the outer air guide (12) so as to adsorb water drops in an object to be measured. The sensor that this disclosure provided can be when engine exhaust gets into the sensor, directly adsorb the water droplet in the exhaust, prevents water droplet and measuring component contact, avoids measuring component breaking failure, guarantees the security of using, and simultaneously after the engine starts, the sensor can begin the work of raising the temperature certainly simultaneously, has practiced thrift the dew point time, guarantees measured data's accuracy, has improved measurement of efficiency.
Description
Technical Field
The present disclosure relates to the technical field of industrial devices, and in particular, to a sensor, an engine exhaust gas treatment system, a control method of the engine exhaust gas treatment system, and a vehicle.
Background
Sensors, such as oxygen sensors, nitrogen oxygen sensors, PM (particulate matter, mainly carbon particles) sensors, are used in a plurality of automotive aftertreatment systems, and in the process of treating engine exhaust gas, the sensors are all involved in the heating process of a core component, namely a measurement component, of the sensor, and the measurement component needs to be heated to about 560 ℃ to obtain a more accurate measurement result. However, water droplets often exist in the exhaust gas of the engine, and when the water droplets contact the hot measurement component, the measurement component expands and contracts with heat, and fracture failure occurs.
In the related art, a dew point marking is performed for such a sensor, that is, when it is necessary to eliminate water droplets in the exhaust gas and confirm that there are no water droplets in the exhaust gas entering the sensor, the sensor can start a self-heating process, for example, when the engine is started, the hot exhaust gas can be heated during the exhaust gas treatment process, and it is necessary to wait about 15 minutes until the water droplets in the exhaust gas can be removed, and then the engine ECU controls the sensor to perform the self-heating process. That is, the actual working time of the sensor needs to be later than the starting time of the engine, and the sensor cannot work for a while, which affects the accuracy of the measured data of the sensor.
Disclosure of Invention
The first purpose of this disclosure is to provide a sensor, this sensor can solve current sensor and need to wait to start the self-heating procedure after the water droplet in the measurement volume gets rid of, influences the technical problem of measured data's accuracy.
It is a second object of the present disclosure to provide an engine exhaust treatment system that uses the sensor provided by the present disclosure.
A third object of the present disclosure is to provide a control method of an engine exhaust gas treatment system, which can improve the treatment efficiency of engine exhaust gas.
It is a fourth object of the present disclosure to provide a vehicle including the engine exhaust gas treatment system provided by the present disclosure.
In order to achieve the above object, the present disclosure provides a sensor, which includes an inner wind guide and an outer wind guide that are coaxially arranged, and a measurement component fixed in an inner cavity of the inner wind guide, wherein a water absorption coating is coated on an outer wall of the inner wind guide and/or on an inner wall of the outer wind guide to absorb water droplets in a measurement object.
Optionally, a plurality of air guide holes are formed in the outer air guide, the lower end surfaces of the inner air guide and the outer air guide are closed, an opening is formed in the upper end surface, and the object to be measured enters the cavity between the inner air guide and the outer air guide through the air guide holes and enters the inner cavity of the inner air guide through the opening so as to be in contact with the measuring component.
Optionally, a water absorbing coating is coated on a bottom plate connecting the lower end faces of the inner air guide and the outer air guide.
Optionally, an air outlet is formed in the bottom plate, and a ratio of a distance from a lowermost end of the measuring assembly to the bottom plate to a height of the inner air guide is 1: 1-4.
Optionally, the inner air guide and the outer air guide are of an integrated structure, the upper end of the outer air guide is fixedly connected with the shell of the sensor, a shaft sleeve used for fixing the measuring assembly is arranged in the shell, the shaft sleeve is provided with a shaft diameter expanding section connected with the outer air guide, and the opening is formed between the shaft diameter expanding section and the upper end of the inner air guide.
Optionally, the water absorbing coating is a high water absorbing mesoporous molecular sieve.
According to a second aspect of the present disclosure, there is also provided an engine exhaust gas treatment system, including an exhaust pipe connected to a supercharger, and a nitrogen oxide collector, a particulate trap, a catalytic device, and a plurality of nitrogen oxide sensors, oxygen sensors, and high temperature sensors disposed in the exhaust pipe, wherein at least one of the nitrogen oxide sensors, the oxygen sensors, and the high temperature sensors is the above-mentioned sensor.
According to a third aspect of the present disclosure, there is also provided a control method of an engine exhaust gas treatment system, the treatment system being the engine exhaust gas treatment system described above, the control method including: the step of controlling engine exhaust gas to enter the sensor and the step of the sensor self-heating are performed simultaneously.
Optionally, the sensor is controlled to self-heat to above 560 ℃ when the engine exhaust reaches the inner cavity of the inner air guide and contacts the measurement assembly.
According to a fourth aspect of the present disclosure, there is also provided a vehicle comprising the engine exhaust gas treatment system described above.
Through the technical scheme, this sensor that openly provides can be when engine exhaust gets into the sensor, directly adsorb the water droplet in the exhaust, prevent water droplet and measuring component contact, avoid measuring component breaking occur inefficacy, guarantee the security of using, simultaneously after the engine start-up, the sensor can begin simultaneously from the work of raising the temperature, has practiced thrift the dew point time, guarantees measured data's accuracy, has improved measurement of efficiency.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:
FIG. 1 is a schematic block diagram of an engine exhaust treatment system provided in accordance with an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic block diagram illustration of an engine exhaust treatment system provided in accordance with another exemplary embodiment of the present disclosure;
FIG. 3 is a schematic block diagram of an engine exhaust treatment system provided in accordance with another exemplary embodiment of the present disclosure;
FIG. 4 is a perspective view of a sensor provided in an exemplary embodiment of the present disclosure;
FIG. 5 is a cross-sectional view of a sensor provided in an exemplary embodiment of the present disclosure;
FIG. 6 is an enlarged partial view of a lower portion of a sensor provided by an exemplary embodiment of the present disclosure;
FIG. 7 is a flowchart illustrating a method of controlling an engine exhaust treatment system according to an exemplary embodiment of the present disclosure.
Description of the reference numerals
1-sensor, 11-inner air guide, 12-outer air guide, 120-air guide hole, 121-opening, 13-measuring component, 14-bottom plate, 140-air outlet hole, 15-shell, 16-shaft sleeve, 160-shaft diameter gradually expanding section, 2-exhaust pipeline, 3-nitrogen oxide collector, 4-particle trap, 5-catalytic device, 6-nitrogen oxide sensor, 7-oxygen sensor and 8-high temperature sensor.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, unless stated to the contrary, the use of directional terms such as "upper" and "lower" generally refer to those defined in the context of normal use of the sensor provided by the present disclosure, and in particular with reference to the orientation of the figures of the drawings, "inner" and "outer" refer to the inner and outer contours of the corresponding parts, and further, when the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements, unless otherwise indicated.
As shown in fig. 1 to 3, in the engine exhaust gas treatment system, a plurality of sensors are arranged on an exhaust line 2 connected at an outlet of a supercharger, specifically, taking the Diesel engine exhaust gas treatment system shown in fig. 1 and 2 as an example, an oxygen sensor 7 disposed upstream of a nitrogen oxide trap 3 (LNT), a nitrogen oxide sensor 6, a high temperature sensor 8, and an oxygen sensor 7 disposed upstream of a Diesel Particulate Filter (DPF), a high temperature sensor 8 disposed upstream of a Selective Catalytic Reduction (SCR), and a nitrogen oxide sensor 6 disposed downstream. The sensor needs to carry out dew point calibration when in use, namely, an engine is started firstly, water drops in exhaust gas are heated through exhaust gas produced by the engine, after the water drops in the exhaust gas are completely evaporated, the sensor starts a self-heating program, the actual working time of the sensor is later than the starting time of the engine, in cold winter, the time is about 15 minutes, so that the dew point time is saved, the sensor can start self-heating operation when the engine is started, and the sensor is a breakthrough direction of the industry research.
In order to solve the above problems, as shown in fig. 4 to 6, the present disclosure provides a sensor 1, where the sensor 1 includes an inner air guide 11 and an outer air guide 12 which are coaxially arranged, and a measuring component 13 fixed in an inner cavity of the inner air guide 11, where a water absorbing coating is coated on an outer wall of the inner air guide 11 and/or on an inner wall of the outer air guide 12 to adsorb water droplets in an object to be measured, and it should be noted that the sensor 1 provided by the present disclosure is not limited to be capable of measuring oxygen content, nitrogen oxides, and PM particles, and may be any type of sensor commercially available, and the following description will be made in detail by taking a sensor applied in the technical field of engine exhaust gas treatment as an example. In addition, the present disclosure includes a technical scheme of applying a water absorbing coating on the outer wall of the inner air guide 11, and also includes a technical scheme of applying a water absorbing coating on the inner wall of the outer air guide 12, and certainly also includes a technical scheme of simultaneously applying water absorbing coatings on the outer wall of the inner air guide 11 and the inner wall of the outer air guide 12, and the following detailed description will be given by taking the case that the water absorbing coatings are applied on both the outer wall of the inner air guide 11 and the inner wall of the outer air guide 12 as examples.
Through the technical scheme, this sensor 1 that openly provides can be when engine exhaust gets into the sensor, directly adsorb the water droplet in the exhaust, prevent water droplet and the contact of measuring component 13, avoid measuring component 13 breaking away to become invalid, the security of guaranteeing to use, simultaneously after the engine starts, the sensor can begin simultaneously to work from rising the temperature, has practiced thrift the dew point time, guarantees measured data's accuracy, has improved measurement of efficiency.
Specifically, in the present embodiment, as shown in fig. 4 to 6, a plurality of air guiding holes 120 are formed in the outer air guide 12, the lower end surfaces of the inner air guide 11 and the outer air guide 12 are closed, the upper end surface is formed with an opening 121, and an object to be measured, for example, engine exhaust, enters the cavity between the inner air guide 11 and the outer air guide 12 through the air guiding holes 120, moves upward and enters the inner cavity of the inner air guide 11 through the opening 121 to contact the measuring component 13. The measuring component 13 is fixed above, and the engine exhaust is guided to move upwards by designing the lower end as a closed structure, so that water drops in the exhaust are adsorbed in the interlayer cavity of the sensor 1 in the process of moving towards the measuring component 13, and the fact that no water drops exist in the exhaust reaching the measuring component 13 is guaranteed.
In the present disclosure, a water-absorbing coating is applied to a bottom plate 14 connecting lower end faces of the inner wind guide 11 and the outer wind guide 12, and the bottom plate 14 can close openings at lower ends of the inner wind guide 11 and the outer wind guide 12 on the one hand, so that exhaust gas entering the sensor 1 can only move upwards to reach the measurement component 13. On the other hand, the water-absorbing coating is applied to the bottom plate 14, and the adsorption effect on the exhaust gas entering the sensor 1 can be further increased.
In the present disclosure, as shown in fig. 5 and 6, an air outlet hole 140 is formed in the bottom plate 14, the engine exhaust gas flowing through the measuring unit 13 can flow downward and exit the sensor 1 through the air outlet hole 140, and at the same time, in order to prevent the water vapor entering through the air outlet hole 140 from contacting the measuring unit 13, in the sensor provided by the present disclosure, the measuring unit 13 is of an adduction type, and the ratio of the distance from the lowermost end of the measuring unit 13 to the bottom plate 14 to the height of the inner air guide 11 is 1: 1-4, the water vapor entering from the lower air outlet 140 is prevented from sputtering on the measuring component 13, and further the measuring component 13 is prevented from cracking.
The inner air guide 11 and the outer air guide 12 may have any appropriate structure, in the present disclosure, as shown in fig. 6, the inner air guide 11 and the outer air guide 12 are coaxially arranged, the upper end of the outer air guide 12 is fixedly connected to the housing 15 of the sensor 1, a shaft sleeve 16 for fixing the measurement component 13 is arranged in the housing 15, the lower end of the shaft sleeve 16 has a shaft diameter gradually expanding section 160 connected to the outer air guide 12, the opening 121 is formed between the shaft diameter gradually expanding section 160 and the upper end of the inner air guide 11, and the shaft diameter gradually expanding section 160 can play a role in converging and guiding engine exhaust moving upward, so as to guide the engine exhaust to the vicinity of the measurement component 13, thereby further improving accuracy of measurement results.
The water absorption coating described above may be a high water absorption mesoporous molecular sieve, which has high water absorption characteristics, water droplets in the engine exhaust enter the interlayer cavity inside the sensor 1 along with the exhaust, and the water droplets impact the water absorption coating under the action of self inertia, and the high water absorption mesoporous molecular sieve has a sponge-like water absorption effect, and can directly absorb the water droplets in the exhaust. In addition, the high water absorption mesoporous molecular sieve belongs to the M41S family of molecular sieves, the main raw materials comprise aluminum hydroxide, sodium hydroxide and a surfactant, the sodium hydroxide and the aluminum hydroxide can improve the water absorption capacity of the molecular sieve, and the surfactant is used for enhancing the water drop catching capacity and improving the adsorption efficiency. After the high water absorption mesoporous molecular sieve is adopted, the adsorbed water drops can be quickly evaporated when the exhaust temperature of the engine is about 80 ℃, and in cold winter, the exhaust temperature of the engine is generally 150 ℃, namely, even in cold winter, after the engine is started, the exhaust gas can directly enter the sensor 1, the water drops in the exhaust gas can be adsorbed and evaporated, and the exhaust gas cannot enter the inner cavity of the inner air guide component 11 and contact with the measuring component 13.
According to a second aspect of the present disclosure, as shown in fig. 1 to 3, there is further provided an engine exhaust gas treatment system, which includes an exhaust pipe 2 connected to a supercharger, and a nitrogen oxide collector 3, a Particulate trap 4, a Catalytic device 5, and a plurality of nitrogen oxide sensors 6, oxygen sensors 7, and a high temperature sensor 8, which are sequentially disposed on the exhaust pipe 2, wherein the Particulate trap 4 may be a Diesel Particulate Filter (DPF), a Diesel Particulate Filter with an SCR coating (SDPF), a Gasoline Particulate Filter (GPF), a Catalytic device 5 may be a Selective Catalytic Reduction device (SCR), a Three-way Catalytic converter (Three-way Catalyst, TWC), in the engine exhaust gas treatment system provided by the present disclosure, at least one of the nitrogen oxide sensor 6, the oxygen sensor 7, and the high temperature sensor 8 may be the above sensor, and the engine exhaust gas treatment system has all the beneficial effects of the above sensors, and will not be described in detail herein.
According to a third aspect of the present disclosure, as shown in fig. 7, there is also provided a control method of an engine exhaust gas treatment system, which may be the engine exhaust gas treatment system described above, the control method provided by the present disclosure includes: step 101, controlling the exhaust gas of the engine to enter the sensor, namely starting the engine, and step 102, controlling the sensor to perform self-heating, wherein the step 101 and the step 102 are performed synchronously, so that the sensor 1 does not need dew point calibration, the exhaust gas of the engine can directly enter the sensor 1, the sensor 1 performs self-heating while the engine is started, and the measuring component 13 cannot be cracked.
In the control method provided by the present disclosure, step 103 is further included, when the engine exhaust reaches the inner cavity of the inner air guide 11 and contacts with the measurement component 13, the sensor is controlled to self-heat to above 560 ℃, so that the sensor 1 can be ensured to have good measurement precision, and the accuracy of the measurement result is improved.
According to a fourth aspect of the present disclosure, there is also provided a vehicle including the engine exhaust gas treatment system described above, the vehicle having all the advantages of the sensor and the engine exhaust gas treatment system described above, and the details thereof are not repeated herein.
The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure as long as it does not depart from the gist of the present disclosure.
Claims (10)
1. The sensor is characterized by comprising an inner air guide (11) and an outer air guide (12) which are coaxially arranged, and a measuring component (13) fixed in an inner cavity of the inner air guide (11), wherein a water absorption coating is coated on the outer wall of the inner air guide (11) and/or the inner wall of the outer air guide (12) so as to adsorb water drops in a to-be-measured object.
2. The sensor according to claim 1, wherein a plurality of air guiding holes (120) are formed in the outer air guiding member (12), the lower end surfaces of the inner air guiding member (11) and the outer air guiding member (12) are closed, an opening (121) is formed in the upper end surface, and the object to be measured enters the cavity between the inner air guiding member (11) and the outer air guiding member (12) through the air guiding holes (120) and enters the inner cavity of the inner air guiding member (11) from the opening (121) to be in contact with the measuring component (13).
3. A sensor according to claim 2, characterised in that a water-absorbent coating is applied to a base plate (14) connecting the lower end faces of the inner and outer air guides (11, 12).
4. A sensor according to claim 3, wherein the bottom plate (14) is formed with an air outlet hole (140), and a ratio of a distance from a lowermost end of the measuring component (13) to the bottom plate (14) to a height of the inner air guide (11) is 1: (1-4).
5. The sensor according to claim 2, characterized in that the inner wind guide (11) and the outer wind guide (12) are of an integral structure, the upper end of the outer wind guide (12) is fixedly connected with a housing (15) of the sensor (1), a shaft sleeve (16) for fixing the measuring assembly (13) is arranged in the housing (15), the shaft sleeve (16) is provided with a shaft diameter expanding section (160) connected with the outer wind guide (12), and the opening (121) is formed between the shaft diameter expanding section (160) and the upper end of the inner wind guide (11).
6. The sensor of any one of claims 1-5, wherein the water-absorbing coating is a high water-absorbing mesoporous molecular sieve.
7. An engine exhaust gas treatment system comprising an exhaust line (2) connected to a supercharger, and a nitrogen oxide trap (3), a particulate trap (4), a catalytic device (5), and a plurality of a nitrogen oxide sensor (6), an oxygen sensor (7), and a high temperature sensor (8) provided in the exhaust line (2) in this order, characterized in that at least one of the nitrogen oxide sensor (6), the oxygen sensor (7), and the high temperature sensor (8) is a sensor according to any one of claims 1-6.
8. A control method of an engine exhaust gas treatment system, characterized in that the treatment system is the engine exhaust gas treatment system according to claim 7, the control method comprising:
the step of controlling engine exhaust gas to enter the sensor and the step of the sensor self-heating are performed simultaneously.
9. The method of controlling an engine exhaust treatment system according to claim 8, wherein the sensor is controlled to self-heat to above 560 ℃ when the engine exhaust reaches the inner cavity of the inner air guide and contacts the measurement component.
10. A vehicle characterized by comprising an engine exhaust gas treatment system according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110032090.2A CN114755019A (en) | 2021-01-11 | 2021-01-11 | Sensor, engine exhaust gas treatment system, control method of engine exhaust gas treatment system, and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110032090.2A CN114755019A (en) | 2021-01-11 | 2021-01-11 | Sensor, engine exhaust gas treatment system, control method of engine exhaust gas treatment system, and vehicle |
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| CN114755019A true CN114755019A (en) | 2022-07-15 |
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Cited By (1)
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| CN117054618A (en) * | 2023-10-13 | 2023-11-14 | 比亚迪股份有限公司 | Gas detection element, exhaust system, and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054618A (en) * | 2023-10-13 | 2023-11-14 | 比亚迪股份有限公司 | Gas detection element, exhaust system, and vehicle |
| CN117054618B (en) * | 2023-10-13 | 2024-01-09 | 比亚迪股份有限公司 | Gas detection element, exhaust system, and vehicle |
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