EP3803364A1 - Gassensor mit einer grundgehäuseseitigen umlenkfläche zur drosselung der fluidströmung - Google Patents
Gassensor mit einer grundgehäuseseitigen umlenkfläche zur drosselung der fluidströmungInfo
- Publication number
- EP3803364A1 EP3803364A1 EP19719775.9A EP19719775A EP3803364A1 EP 3803364 A1 EP3803364 A1 EP 3803364A1 EP 19719775 A EP19719775 A EP 19719775A EP 3803364 A1 EP3803364 A1 EP 3803364A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective tube
- gas sensor
- gas
- deflection
- inner protective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012530 fluid Substances 0.000 title description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 115
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 description 44
- 239000004071 soot Substances 0.000 description 7
- 239000000523 sample Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4077—Means for protecting the electrolyte or the electrodes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0007—Investigating dispersion of gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
Definitions
- the invention relates to a gas sensor according to the preamble of claim 1.
- the invention also relates to an associated protective tube module and an associated basic housing.
- Gas sensors are used for example for measuring exhaust gas parameters in the exhaust system of motor vehicles.
- lambda sensors, NOx sensors or soot particle sensors are used.
- the functional unit of these sensors comprises a sensor element.
- the sensor element is regularly surrounded by a protective tube module, which protects the sensor element against unwanted external influences and allows a targeted flow of the sensor element with sample gas.
- a gas sensor for determining at least one state variable of a measurement gas, in particular the
- the gas sensor comprises a base housing and a protective tube module arranged on the base housing, which comprises an inner protective tube extending in a longitudinal direction in which a sensor element can be arranged or arranged, and an outer protective tube surrounding the inner protective tube at least in some sections.
- measuring gas can be flowed into the protective tube module between the outer protective tube and the inner protective tube, and in a deflection region for inflow into the protective tube
- the deflection area includes one of
- Base housing formed deflection, wherein between the deflection and the inner protective tube, a gap is present, through the sample gas into the inner protective tube can be flowed, and wherein the deflection at the gap has the smallest distance to the inner protective tube in the longitudinal direction.
- Base housing-side deflection surface can be achieved in an advantageous manner initially throttling the flowing into the space between the inner protective tube and outer protective fluid flow. Due to the design of the deflection surface so that these at the gap the smallest distance to
- the fluid flow can be deflected in the direction of the sensor element in comparison to the prior art, so that a total of an advantageous fluid flow in the gas sensor for
- the sensitivity of the gas sensor for example, to soot concentrations when the gas sensor is designed as a soot particle sensor to increase.
- the deflection surface extends in cross-section obliquely to a direction orthogonal to the longitudinal direction plane.
- a particularly preferred direct deflection of the fluid flow flowing into the protective tube module towards the sensor element can be provided.
- the deflection is formed as a flat surface. In cross section, the deflection can therefore be formed as a straight line. This also results in a particularly advantageous direct flow of the
- the deflection region comprises a
- Deflection region can consequently be limited to one of the deflection surface and the other by the end portion of the outer protective tube. As a result, a direct flow of the sensor element can be provided comparatively easily.
- the outer protective tube bears against the end of the deflecting surface facing away from the gap, so that the deflecting region has a substantially triangular shape in cross section.
- the outer protective tube can thus form a triangular or substantially triangular recess together with the deflection surface. Consequently, can
- the outer protective tube and the deflection surface therefore in particular include an angle of less than 90 °.
- the angle may for example be between 40 ° and 50 ° and in particular 45 °. With a design of 45 °, the deflection surface can consequently form the hypotenuse of the triangular deflection region.
- the inner protective tube has an inner side
- the base housing has an opening bounded by an inner side toward the inner protective tube, the inner side of the aperture being adjacent to the deflection surface.
- the sensor element can be inserted into the inner protective tube.
- the inside of the opening can consequently pass into the deflection surface at one, in particular circumferential, edge. This edge can in particular represent the smallest distance of the deflection surface in the longitudinal direction to the inner protective tube and thus together with the basic housing facing free end of the
- Inner protective tube to limit the gap. Furthermore, it can be provided that the inside of the inner protective tube is arranged flush with the inside of the opening. The inside of the
- Breakthrough can thus be separated over the gap in the longitudinal direction of the inside of the inner protective tube.
- the protective tube module has a collar-like connecting portion for connecting the inner protective tube to the outer protective tube, wherein the connecting portion has at least one opening through which the measuring gas can flow into the deflection region.
- the protective tube module can therefore be designed in particular in one piece.
- the collar-like connecting portion also the
- Inner protective tube extends beyond the outer protective tube in the longitudinal direction.
- the inner protective tube may be welded to the inner protective tube.
- the protective tube module is materially connected to the basic housing, in particular welded, is. This results in a particularly stable and durable connection between the thermowell module and the base housing.
- the problem underlying the invention is also solved by a basic housing for a gas sensor according to the invention. Additionally or alternatively, the problem underlying the invention is also solved by a protective tube module for a gas sensor according to the invention.
- a basic housing can therefore in particular comprise a deflection surface.
- thermowell module can by the formation of a Gaps are provided a throttling and in particular also a particularly advantageous fluid supply to the sensor element.
- FIG. 1 Schematic cross section through a basic housing with it
- FIG. 2 shows a detail of the protective tube module according to FIG. 1;
- FIG. 3 shows a detail of the basic housing according to FIG. 1;
- Figure 4 shows a schematic cross section through a base housing with it
- a gas sensor as a whole carries the reference numeral 10.
- the gas sensor 10 initially comprises a base housing 12 (see Figure 3), which may be made of metal, for example.
- the base housing 12 has a fastening section, not shown here, for arranging the gas sensor on a flow channel, not shown here, for measuring gas.
- the flow channel can be, for example, the exhaust pipe of an internal combustion engine, for example the internal combustion engine of a motor vehicle.
- the protective tube module 14 has a main extension in the longitudinal direction 16.
- the base housing 12 and / or the protective tube module 14 may in particular be rotationally symmetrical about a central longitudinal axis 15.
- the Protective tube module 14 comprises an inner protective tube 18, which may be cylindrical, in particular circular cylindrical, with an inner side 19.
- the inner protective tube 18 is substantially pot-shaped and comprises a tube jacket 20 and a tube plate 22 with an opening 24 which is formed as a central hole.
- the inner protective tube 18 is surrounded by a pot-shaped outer protective tube 26 at a radial distance.
- the outer protective tube 26 likewise comprises a tube jacket 28 and a borehole 30 with an opening 32, through which the inner protective tube 18 is positively or in the
- Outer protective tube 26 is in this case opposite the tube plate 22 of the
- Inner protective tube 18 set back so that the inner protective tube 18, the outer protective tube 26 projects beyond in the longitudinal direction 16.
- the inner protective tube 18 is connected to the outer protective tube 26 via a collar-like connecting portion 34.
- the protective tube module 14 may be integrally formed.
- the collar-like connecting portion 34 is provided on the base housing 12 facing the free end 36 of the inner protective tube 18.
- the connecting section 34 comprises a number of openings 38 extending in the longitudinal direction 16.
- a deflection region 37 is provided below the connecting portion 34 in the direction of the base housing 12. This is generally triangular in shape and is limited on the one hand by a bottom 39 of the connecting portion 34 and the other by an end portion 40 of the outer protective tube 26, wherein the bottom 39 and the end portion 40 form an angle of 90 ° with each other.
- the basic housing has a circumferential deflection surface 42. The deflection surface is formed as a straight line in cross section and extends obliquely to a plane 45 extending orthogonally to the longitudinal axis 16 (see FIG.
- the deflection surface 42 encloses an angle of 45 ° with the end section 40 of the outer protective tube 26.
- the deflection region 37 is thus formed as a kind of circumferential triangular groove.
- the base housing 12 further includes an opening 44 for
- the opening 44 is bounded by an inner side 46 which merges at an edge 48 into the deflection surface 42.
- the edge 48 is arranged opposite the free end 36 of the inner protective tube 18 in the longitudinal direction 16, so that a gap 50 between the inner protective tube 18 and the base housing 12 is formed.
- Outer protection tube 26 a number of openings 52 are provided.
- a sensor element 58 is arranged in the inner protective tube 18.
- the sensor element 58 may comprise, for example, an interdigital electrode (IDE).
- IDE interdigital electrode
- Such an IDE can be used, for example, to determine the amount of soot deposited thereon as a measure of the
- the sensor element 58 can thus be designed, in particular, as a gas-sensitive end section of, for example, a rod-shaped ceramic body, which is arranged in the base housing 12 and can be guided into the inner protective tube 18 through the opening 44.
- the outer protective tube 26 finally includes a voltage applied to the base housing 12 and this partially encompassing free end portion 17.
- the end portion 17 may in particular be welded to the base housing 12 in order to attach the protective tube module 14 cohesively to the base housing 12.
- the gas sensor 10 may, for example, in an exhaust pipe of a
- the sensor element 58 can in particular be provided for determining the particle concentration, for example the soot concentration, in the exhaust gas of the internal combustion engine, so that it can be a particle sensor, in particular a soot particle sensor.
- the sensor element 58 is designed to determine another state variable of a measurement gas. So can
- the sensor element 58 as a so-called lambda probe for Determining the oxygen concentration in the exhaust gas of an internal combustion engine be designed or as a sensor element 58 for determining the
- Nitrogen oxide concentration in the exhaust gas of an internal combustion engine is also important.
- Temperature sensor for measuring the exhaust gas temperature may be such a sensor element 58.
- the measuring gas In order to determine the at least one state variable of a measuring gas, as indicated by the arrows 60, the measuring gas from the exhaust pipe, on or in which the gas sensor 10 is arranged, via the openings 52 in the space 56 between the inner protective tube 18 and outer protective tube 26th stream. Then, the measuring gas flows further through the openings 38 in the connecting portion 34. In this case, the mass flow of the measuring gas is throttled through the connecting portion 34.
- the measurement gas flows in the deflection region 37 and is of the
- Deflection 42 directed to the gap 50 out.
- the mass flow of the sample gas is throttled again. Then the sample gas flows in
- Openings 38 and later through the gap 50 a particularly favorable flow of the sensor element 58 can be provided. Furthermore, this also makes it possible, in particular, to increase the sensitivity of the sensor element 58 and / or to provide improved protection against cooling during the regeneration of the gas sensor 10.
- FIG. 4 differs from the embodiment according to FIGS. 1 to 3 in that the inner protective tube 18 is not fixed on the outer protective tube 26 via the connecting section 34, but rather that the inner protective tube 18 on the outer protective tube 26 is fixed to the tube plate 30 of the outer protective tube 26 on the outer tube 26
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Dispersion Chemistry (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018208178.6A DE102018208178A1 (de) | 2018-05-24 | 2018-05-24 | Gassensor |
PCT/EP2019/059287 WO2019223934A1 (de) | 2018-05-24 | 2019-04-11 | Gassensor mit einer grundgehäuseseitigen umlenkfläche zur drosselung der fluidströmung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3803364A1 true EP3803364A1 (de) | 2021-04-14 |
Family
ID=66290380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19719775.9A Pending EP3803364A1 (de) | 2018-05-24 | 2019-04-11 | Gassensor mit einer grundgehäuseseitigen umlenkfläche zur drosselung der fluidströmung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3803364A1 (de) |
KR (1) | KR20210013561A (de) |
DE (1) | DE102018208178A1 (de) |
WO (1) | WO2019223934A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116380740B (zh) * | 2023-05-16 | 2023-08-08 | 江苏省环境监测中心 | 一种废气浓度检测机构及其使用方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008041038B4 (de) * | 2008-08-06 | 2023-05-25 | Robert Bosch Gmbh | Gassensor |
DE102012211039A1 (de) * | 2012-06-27 | 2014-01-02 | Robert Bosch Gmbh | Gassensor |
DE102015209262A1 (de) * | 2015-05-21 | 2016-11-24 | Bayerische Motoren Werke Aktiengesellschaft | Abgasanlage mit einem Gassensor, insbesondere mit einem Partikelsensor |
DE102016213641B4 (de) * | 2016-07-26 | 2023-03-30 | Emisense Technologies Llc | Partikelsensor mit Umlenkelement |
DE102017208773A1 (de) * | 2017-05-23 | 2018-11-29 | Robert Bosch Gmbh | Partikelsensor |
DE102017215798A1 (de) * | 2017-09-07 | 2019-03-07 | Continental Automotive Gmbh | Partikelsensor mit Umlenkelement |
-
2018
- 2018-05-24 DE DE102018208178.6A patent/DE102018208178A1/de active Pending
-
2019
- 2019-04-11 KR KR1020207033501A patent/KR20210013561A/ko not_active Application Discontinuation
- 2019-04-11 WO PCT/EP2019/059287 patent/WO2019223934A1/de unknown
- 2019-04-11 EP EP19719775.9A patent/EP3803364A1/de active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2019223934A1 (de) | 2019-11-28 |
KR20210013561A (ko) | 2021-02-04 |
DE102018208178A1 (de) | 2019-11-28 |
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