EP3060904A1 - Dispositif de détection pour détecter au moins une propriété d'un fluide - Google Patents

Dispositif de détection pour détecter au moins une propriété d'un fluide

Info

Publication number
EP3060904A1
EP3060904A1 EP14747579.2A EP14747579A EP3060904A1 EP 3060904 A1 EP3060904 A1 EP 3060904A1 EP 14747579 A EP14747579 A EP 14747579A EP 3060904 A1 EP3060904 A1 EP 3060904A1
Authority
EP
European Patent Office
Prior art keywords
fluid medium
protective housing
housing
sensor device
flow path
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.)
Withdrawn
Application number
EP14747579.2A
Other languages
German (de)
English (en)
Inventor
Simon Rentschler
Christopher Holzknecht
Marc Brueck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3060904A1 publication Critical patent/EP3060904A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors
    • 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
    • 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

Definitions

  • Sensor devices are known from the prior art for detecting at least one property of a fluid medium, preferably a gas. These include sensor devices having at least one sensor element for detecting at least one parameter of a gas, in particular at least one property of an exhaust gas of an internal combustion engine, such as the proportion of a component of the exhaust gas, in particular the oxygen content, the nitrogen oxide content and / or the proportion of gaseous hydrocarbons. Further properties that can be detected with such a sensor device are, for example, the particle loading, the temperature and / or the pressure of the fluid medium.
  • a sensor device may in particular be a lambda probe. Lambda probes are preferably used in the exhaust system of an internal combustion engine, especially to detect the oxygen partial pressure in the exhaust gas. Lambda probes are described for example in Konrad Reif, eds., Sensors in motor vehicles, 2nd edition, Springer Vieweg, 2012, pages 160 to 165.
  • Such sensor devices have protective housings, in particular at their exhaust-side tip, which protrude into the exhaust-gas flow.
  • the protective housings serve to protect against mechanical stresses both during installation and by particles occurring in the exhaust gas system, for targeted flow guidance of the fluid medium within the sensor device to the sensor element located therein and for protection of the sensor element against a condensate from the exhaust gas and a thus connected thermal shock of the sensor element.
  • a so-called thermal shock occurs in particular when a condensate droplet forms from the exhaust gas flow and deposits on the hot ceramic sensor element, as a result of which local temperature differences are produced on the surface of the sensor element which lead to high thermally induced stresses in the sensor element can eventually cause damage or even destruction of the sensor element.
  • the protective housing is usually designed so as to reduce as much as possible a quantity of fluid in the exhaust system of the sensor device to an amount which is harmless up to a dew point end for the sensor element.
  • it is preferably additionally provided with a coating for thermal insulation and / or for liquid bonding. It is particularly advantageous here if the coating has a ceramic, in particular an aluminum oxide.
  • the requirements for the protective housing in many cases in opposite directions. In practice, there is a particular conflict of objectives between the requirements for high protection against thermal shock and for high dynamics of the sensor device. This means, in particular, that measures on the protective housing, which lead to a reduction in the load on the sensor element with liquid, often simultaneously result in a reduction in the dynamics of the sensor device.
  • the protective housing itself can be made in one or more parts, wherein a multi-part design usually has an inner housing and an outer housing surrounding the outer housing, between which an intermediate space is formed, in which optionally further protective tubes are located.
  • Protective housings which have two or three protective tubes and which are therefore also referred to as double or triple protection tube, will be used particularly frequently.
  • a triple protection tube usually has better protection against thermal shock compared to a double protection tube.
  • the triple protection tubes known from the prior art have a number of disadvantages. Compared to a double protection tube is in a triple protection tube, a flow path, the gas flow must pass from inlet openings on the protective housing to the sensor element, usually longer.
  • triple protection tubes of the prior art are no longer suitable for such purposes.
  • the current design of triple protection tubes also requires that the inner housing is inserted from the side of a reference air space in the outer housing. Due to the thereby required limitation of the diameter of the inner housing can be used because of the limited space in the inner housing only those sensor elements that have no additional protective coating against thermal shock. However, a missing coating of the sensor element significantly reduces the amount of liquid which may be applied to the sensor element from the exhaust gas stream.
  • this conventional arrangement in the triple protection tubes results in that, despite an additional protective tube, the protective effect of the entire sensor device before thermal shock is only insignificantly increased or not increased due to the reduced protection of the sensor element prior to thermal shock.
  • EP 2 333 534 A2 discloses a sensor device for detecting at least one property of a fluid medium, which is provided with a protective housing for receiving at least one sensor element.
  • a protective housing for receiving at least one sensor element.
  • the flow path through which the fluid medium flows which runs from the inlet openings in the outer housing via the intermediate space and inlet openings in the inner housing to the sensor element, wherein the flow path within the protective housing has two deflection points, at which the fluid medium in each case one Change of direction by an angle of 90 ° experiences.
  • at least one wall body is provided within the protective housing along the flow path, which is arranged and adapted to absorb heat from the fluid medium, which is guided past the wall body at the lowest possible speed.
  • a sensor device for detecting at least one property of a fluid medium in particular an exhaust gas of an internal combustion engine, proposed, which at least largely overcomes the known limitations and disadvantages.
  • a sensor device is used in particular for detecting at least one property of a fluid medium, preferably a property of the exhaust gas of an internal combustion engine, for example the Oxygen content, the nitrogen oxide content and / or the proportion of gaseous hydrocarbons in the exhaust gas.
  • the detection of further properties of the fluid medium is conceivable.
  • the present sensor device is particularly suitable for use at high temperatures, but is preferably not limited to 600 ' ⁇ to 1000' ⁇ .
  • the sensor device comprises at least one protective housing, which is provided for receiving at least one sensor element and for this purpose at least partially surrounds the sensor element.
  • a protective housing means a device which is set up to protect the sensor element at least from the usual mechanical and / or chemical stresses occurring during installation of the sensor device and / or during operation of the sensor device.
  • the protective housing can be produced at least partially from a rigid material, in particular from a metal and / or an alloy and / or a ceramic, which undergoes no deformation, in particular when the protective housing is fixed under normal forces, for example with conventional screwing forces.
  • the protective housing may be arranged to at least partially enclose the sensor device towards the outside and thus to give at least a part of the sensor device an externa ßere shape.
  • the protective housing can in particular be adapted to be introduced completely or partially into the fluid medium, for example into the exhaust gas line of an internal combustion engine.
  • the protective housing can be made in one piece, in two parts, in three parts or in several parts.
  • the protective housing can be made in two parts and accordingly have a separate inner housing, which can surround the sensor element at least partially, wherein the inner housing itself can be at least partially surrounded by an outer housing.
  • the inner housing and the outer housing can be arranged relative to one another in such a way that a space which can be acted upon by the exhaust gas is formed between the inner housing and the outer housing, which can preferably take the form of an annular gap.
  • the protective housing can be designed in three parts, wherein in the space between the inner housing and the Au texgepatuse an additional, middle protective housing can be introduced.
  • a flow path is understood as meaning the path which the fluid medium travels from an entry into the protective housing as far as an exit from the protective housing, before the fluid medium can subsequently supply the sensor element thereto.
  • This path is essentially determined by a geometric configuration of a gap within the protective housing in addition to a speed at which the fluid medium enters the protective housing and which can be referred to as the entry speed.
  • An embodiment of the flow path within the protective housing can thus by a geometry of the design of the protective housing including the therein inlet openings for the entry of the fluid in the space of the protective housing, the access openings therein for access of the fluid medium from the intermediate space to the sensor element and optionally can be set in the space located additional internals.
  • the flow path is accordingly set such that the flow path has at least three deflection points or at least four deflection points or at least five deflection points or at least six deflection points.
  • the fluid medium undergoes a change in direction at each of the at least three deflection points by an angle of at least 90 °.
  • the change in direction at the deflection point results in each case from a comparison between the direction of the flow path after an exit of the fluid medium from the deflection point with respect to the direction of the flow path before an entry of the fluid medium in the deflection.
  • the deflection points can be configured to liquid in the exhaust gas, in particular due to inertial forces acting on the liquid during the change in direction in the deflection, preferably in the form of condensate drops on inner walls of the protective housing in the region of the deflection deposit.
  • the outer housing can have at least one inlet opening for the fluid medium.
  • the Au .gecher preferably be at least partially configured in the form of a cylinder, wherein the cylinder has a lateral surface, in which the at least one inlet opening is introduced.
  • the inner housing may preferably have at least one access opening for the fluid medium from the intermediate space, in particular for supplying the fluid medium to the at least one sensor element.
  • the flow path extends from the inlet opening through the intermediate space to the access opening, through which the fluid medium finally reaches the sensor element.
  • the flow path as explained above, at least three deflection points are provided, on which the fluid medium undergoes a change in direction by an angle of at least 90 °.
  • an additional middle protective housing may be introduced such that the flow path can be preferably performed by an area around the middle protective housing.
  • the guidance of the flow path through the area around the middle protective housing can in this case be such that at least two of the total of at least three deflection points, preferably at least four of the at least six deflection points are provided in this area.
  • the middle protective housing may be disposed in the space and configured to produce a flow velocity of the fluid in the space that may at least partially exceed the flow rate that the fluid has immediately after passing through the inlet. In this way it may be possible to cause an acceleration of the fluid medium at least on individual sections of the flow path in the gap.
  • the middle protective housing can have a fold, over which the flow path can be guided, wherein the flow path can be provided in this way with at least one, preferably with two, more preferably with three other deflection points due to the selected geometric design ,
  • a fold is understood to mean a folded-over portion of the middle protective housing which can protrude into the intermediate space and which, compared to the remaining portion, has an angle of less than 180 °, preferably between 60 ° and 120 °, in particular approximately 90 °. Due to the change of direction forced by the fold in the middle protective housing, additional deposition of liquid droplets from the fluid medium to the direction of the angle can take place in an area adjacent to the angle, preferably by inertial forces.
  • the outer housing is designed such that it can form a cavity, which can be configured approximately in the form of a hollow dome, in which the inner housing, preferably fixed, can be introduced.
  • the at least one inlet opening for the gas from the exhaust gas space is arranged in the intermediate space in the lateral surface of the cylinder.
  • This lateral arrangement of the at least one inlet opening in the lateral surface may moreover allow a direct inflow of the exhaust gas into the intermediate space of the protective housing, whereby the flow velocity of the fluid medium may already have an increased value compared to the prior art immediately after entry into the intermediate space which, as stated above, may be of advantage, in particular in this way being able to produce an additional reduction of the mean droplet size in the fluid medium.
  • the embodiment of the present sensor device according to the invention leads to increased robustness of the entire sensor device in many respects Thermal shock.
  • the guidance of the flow path through which the fluid medium can flow through the protective housing through at least three deflection points can bring about a better separation of liquid, which can be located in the fluid medium.
  • the placement of the inlet openings for the fluid medium laterally in the lateral surface of the Au ogeophuses can lead to an increase in the flow velocity of the fluid medium in the housing and thus in particular to improve the dynamics of the sensor element.
  • the increased flow rate may result in increased flow forces that may cause a reduction in average droplet size. In this way, the harmfulness of drops, which reach the sensor element despite all measures, can be significantly reduced.
  • the guidance of the flow path via a fold on a further preferably provided middle protective housing can also lead to an increased deposition of droplets from the fluid medium.
  • This preferred type of embodiment of the protective housing is associated with a gain in space inside the inner housing.
  • the inner housing with a diameter which is selected so that at least one sensor element finds sufficient space which is provided with a ceramic coating, preferably with a ceramic thermal shock coating, for example of aluminum oxide.
  • the at least one sensor element receives increased protection against thermal shock, which is used in addition to the protection achieved by the described embodiment of the protective housing.
  • all proposed measures work together constructively to achieve in this way to increased in all aspects robustness and safety of the entire sensor device from thermal shock.
  • a sensor device according to the present invention can be used in particular also in exhaust gas sensors, which can be switched on already at the start of an engine.
  • FIG. 1 shows a preferred embodiment of a sensor device according to the invention with a protective housing in a three-part design in the form of a sectional drawing.
  • the sensor device 1 10 comprises a protective housing 1 14 for receiving at least one sensor element (not shown), which is surrounded by the protective housing 1 14.
  • the protective housing 1 14 comprises an outer housing 1 16, which has a, designed in the form of a dome cavity 1 18, in which an inner housing 120 is inserted.
  • the Au DTgefelduse 1 16 surrounds the inner housing 120 such that between the Au DTgephaseuse 1 16 and the inner housing 120, a gap 122 is formed.
  • the present preferred embodiment of the protective housing 1 14 comprises a middle protective housing 124 which is introduced into the intermediate space 1 12 between the Au DTgebliuse 1 16 and the inner housing 120.
  • a middle protective housing 124 which is introduced into the intermediate space 1 12 between the Au DTgebliuse 1 16 and the inner housing 120.
  • further embodiments of the protective housing 1 14 for protecting the at least one sensor element of the sensor device 1 10 are conceivable.
  • the outer housing 1 16 of the protective housing 1 14 of the sensor device 1 10 has at least one inlet opening 126 through which fluid medium 1 12 from the exhaust gas chamber into the gap 122 between the Au DTgefelduse 1 16 and the inner housing 120 may occur.
  • the flow path 128 traverses at least three deflection points, in the present exemplary embodiment six deflection points 131, 132, 133 arranged successively on the flow path 128 , 134, 135, 136 are provided.
  • Successively in this context means that the fluid medium 1 12, after it has passed the inlet opening 126, first undergoes a change of direction at a first deflection point 131, before it is guided to a second deflection point 132, where it undergoes a further change of direction.
  • the fluid medium 1 12 passes through a third deflection point 133, then a fourth deflection point 134, followed by a fifth deflection point 135, then a sixth deflection point 136, before finally leaving the intermediate space 122 through the access opening 130 in order in this way to reach the interior of the inner housing 120 in order to act on the sensor element there.
  • the fluid medium 1 12, which moves along the flow path 128 undergoes a change in direction, in this preferred embodiment in each case by an angle of 90 °.
  • the course of the flow path 128 and the six deflection points 131, 132, 133, 134, 135, 136 therein are in particular due to the specific shape of the middle protective housing 124 and the geometric arrangement of the middle protective housing 124 in FIG the intermediate space 122 between the Au DTgeophuse 1 16 and the inner housing 120 set.
  • the first deflection 131 is effected by an impact of the fluid medium 1 12, which is the space 122 from the in a lateral surface 138 of the Au ogeophuses 1 16 located inlet opening 126 is applied to the middle protective housing 124.
  • the second deflection point 132 and the third deflection point 133 are determined by a fold-folded portion 140 of the middle protective housing 124, which forms an angle of approximately 90 ° to the remaining portion 144 of the middle protective housing 124 in a region 142.
  • the fourth deflection point 134 and the fifth deflection point 135 are predetermined by an incomplete subspace 146, wherein the subspace 146 is bounded by the outer housing 16, the inner housing 120 and the folded portion 140 of the middle protective housing 124.
  • the sixth deflection point 136 is fixed by the guidance of the flow path 128 on a path 148 between the inner housing 120 and the middle protective housing 124 to the access opening 130 to the inner housing 120.
  • the change in direction of the flow path 128 by an angle of 90 ° to a separation of liquid from the fluid medium 1 12, preferably in the form of condensate drops.
  • the fluid medium 12 undergoes a high flow velocity in the narrow gap 150 between the inner housing 120 and the middle protective housing 124.
  • comparatively high flow forces act on the drops present in the fluid medium 12 and guide them to a division of these drops into drops.
  • drops should still be drawn through the access opening 130 onto the in the Inner housing 120 located sensor element impinge, so they have at least a small drop size, which reduces the risk of thermal shock on the surface of the sensor element due to small supplied individual volumes of these drops.
  • the inner housing 120 is inserted into the dome-shaped cavity 1 18 of the outer housing 1 16, so that the inner housing 120 in the present preferred embodiment may have an inner diameter 152, whose size is selected so that in the Interior of the inner housing 120 at least one sensor element finds place, which can be additionally provided with a coating against thermal shock.
  • the sensor device 1 10 receives in addition to the embodiment of the protective housing 1 14 shown by way of example in this embodiment an additional device for protection against the occurrence of thermal shock.

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  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Electrochemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

La présente invention concerne un dispositif de détection (110) servant à détecter au moins une propriété d'un fluide (112), en particulier d'un gaz d'échappement d'un moteur à combustion interne. Le dispositif de détection (110) comprend au moins un boîtier de protection (114) destiné à recevoir au moins un élément de détection, au moins un chemin d'écoulement (128) à travers lequel le fluide (112) peut s'écouler étant ménagé à l'intérieur du boîtier de protection (114). Le chemin d'écoulement (128) comprend au moins trois points de déviation (131, 132, 133, 134, 135, 136) qui permettent de modifier la direction du fluide (112) d'un angle d'au moins 90°. Le dispositif de détection (110) de l'invention présente une résistance élevée aux chocs thermiques avec une dynamique élevée de l'élément de détection.
EP14747579.2A 2013-10-21 2014-07-29 Dispositif de détection pour détecter au moins une propriété d'un fluide Withdrawn EP3060904A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310221255 DE102013221255A1 (de) 2013-10-21 2013-10-21 Sensorvorrichtung zur Erfassung mindestens einer Eigenschaft eines fluiden Mediums
PCT/EP2014/066280 WO2015058873A1 (fr) 2013-10-21 2014-07-29 Dispositif de détection pour détecter au moins une propriété d'un fluide

Publications (1)

Publication Number Publication Date
EP3060904A1 true EP3060904A1 (fr) 2016-08-31

Family

ID=51266300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14747579.2A Withdrawn EP3060904A1 (fr) 2013-10-21 2014-07-29 Dispositif de détection pour détecter au moins une propriété d'un fluide

Country Status (5)

Country Link
US (1) US9581470B2 (fr)
EP (1) EP3060904A1 (fr)
CN (1) CN105683743A (fr)
DE (1) DE102013221255A1 (fr)
WO (1) WO2015058873A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102012211039A1 (de) * 2012-06-27 2014-01-02 Robert Bosch Gmbh Gassensor
DE102013205086A1 (de) * 2013-03-22 2014-09-25 Robert Bosch Gmbh Sensorvorrichtung zur Erfassung einer Feuchte eines strömenden fluiden Mediums
WO2017084802A1 (fr) * 2015-11-16 2017-05-26 Robert Bosch Gmbh Capteur de gaz d'échappement
JP6740024B2 (ja) * 2016-06-17 2020-08-12 日本碍子株式会社 ガスセンサ
US10409295B2 (en) * 2016-12-31 2019-09-10 Applied Materials, Inc. Methods and apparatus for enhanced flow detection repeatability of thermal-based mass flow controllers (MFCS)
DE102017205837A1 (de) * 2017-04-05 2018-10-11 Robert Bosch Gmbh Sensorelement zur Erfassung mindestens einer Eigenschaft eines fluiden Mediums
DE102017206308A1 (de) * 2017-04-12 2018-10-18 Robert Bosch Gmbh Abgassensor, insbesondere Partikelsensor
EP3410079B1 (fr) * 2017-06-02 2021-06-02 MEAS France Ensemble de protection de capteur de fluide
DE102018218734A1 (de) * 2018-10-31 2020-04-30 Robert Bosch Gmbh Optischer Partikelsensor, insbesondere Abgassensor
US11313764B2 (en) * 2019-05-01 2022-04-26 Delphi Technologies Ip Limited Particulate matter sensor
CN112611834B (zh) * 2019-10-03 2023-05-09 日本碍子株式会社 气体传感器及保护罩
JP7487136B2 (ja) 2021-03-30 2024-05-20 日本碍子株式会社 ガスセンサ

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US20090101502A1 (en) * 2003-02-10 2009-04-23 Robert Bosch Gmbh Thermal Shock Resistant Gas Sensor Element
EP1729120B1 (fr) * 2004-03-19 2017-12-13 NGK Spark Plug Co., Ltd. Détecteur de gaz
JP4725494B2 (ja) * 2006-04-27 2011-07-13 株式会社デンソー ガスセンサ
DE102006029631B4 (de) 2006-06-28 2019-05-23 Robert Bosch Gmbh Gassensor
JP4765923B2 (ja) * 2006-07-21 2011-09-07 株式会社デンソー ガスセンサ
DE102007023158A1 (de) 2007-05-16 2008-11-20 Robert Bosch Gmbh Gassensor
JP5469553B2 (ja) * 2009-07-17 2014-04-16 日本碍子株式会社 アンモニア濃度検出センサ
JP4856751B2 (ja) * 2009-11-27 2012-01-18 日本碍子株式会社 ガス濃度検出センサー

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Also Published As

Publication number Publication date
US9581470B2 (en) 2017-02-28
US20160252372A1 (en) 2016-09-01
WO2015058873A1 (fr) 2015-04-30
CN105683743A (zh) 2016-06-15
DE102013221255A1 (de) 2015-04-23

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