EP0821781A1 - Device for measuring the volume of a flowing medium - Google Patents

Device for measuring the volume of a flowing medium

Info

Publication number
EP0821781A1
EP0821781A1 EP96928322A EP96928322A EP0821781A1 EP 0821781 A1 EP0821781 A1 EP 0821781A1 EP 96928322 A EP96928322 A EP 96928322A EP 96928322 A EP96928322 A EP 96928322A EP 0821781 A1 EP0821781 A1 EP 0821781A1
Authority
EP
European Patent Office
Prior art keywords
measuring
measuring channel
suction line
channel
axis
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Withdrawn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
EP96928322A
Other languages
German (de)
French (fr)
Inventor
Dieter Tank
Uwe Konzelmann
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 EP0821781A1 publication Critical patent/EP0821781A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow

Definitions

  • the invention relates to a device for measuring the mass of a flowing medium according to the preamble of claim 1.
  • a device (DE-OS 44 07 209) is already known which is used to measure the intake air mass
  • Internal combustion engine has a measuring element housed in a measuring channel.
  • the measuring element is designed, for example, in the form of a ceramic substrate or as a micromechanical component.
  • the device has a slender, cuboid shape that extends radially in the direction of a plug-in axis and is inserted into an opening in a wall of an intake line.
  • the wall of the suction line delimits a flow cross section, which in the case of a cylindrical suction line has approximately a circular cross section.
  • the intake line represents, for example, an intake pipe of an internal combustion engine, through which the internal combustion engine can draw in air from the environment.
  • the radial position of the device is fixed in the opening of the wall of the suction line such that the measuring channel of the measuring part of the device is aligned parallel to the medium flowing in the suction line. In the radial direction, the measuring part of the device preferably protrudes approximately into the middle of the flow cross section of the suction line.
  • Openings are provided in which screws can be inserted to connect the device to the suction line.
  • claim 1 has the advantage that scattering of the characteristic curves resulting from installation tolerances are significantly reduced, so that essentially constant characteristic curves without scattering can be expected during mass production or installation of the device.
  • a device 1 is partially shown in a sectional view, which is used to measure the mass of a flowing medium, in particular the intake air mass of internal combustion engines.
  • the complete structure of such a device can be found, for example, in DE-OS 44 07 209, the disclosure of which is to be part of the present patent application.
  • the device 1 preferably has a slender, cuboid shape that extends radially in the direction of a plug-in axis 10.
  • the plug-in axis 10 is identified by a point in the drawing and extends perpendicular to the drawing plane into the drawing plane of the drawing.
  • the device 1 is introduced in a known manner into an opening of a suction line 4 which is recessed from a wall 2 and fastened to the suction line 4, for example by means of a screw connection.
  • the intake line 4 represents, for example, an intake pipe of a mixture-compressing, spark-ignited internal combustion engine, through which the internal combustion engine can draw in air from the environment.
  • the suction line 4 delimits a flow cross section which, in the case of a cylindrical suction line 4, has an approximately circular cross section, in the middle of which an axis 11 extends in the axial direction in the direction of the flowing medium indicated by arrows 17, parallel to an inner wall 3 of the suction line 4 .
  • the device 1 has a radial extension, so that a cuboid measuring part 15 of the device 1 with a rectangular cross section, shown hatched in the drawing, projects, for example, into the middle of the flow cross section of the suction line 4.
  • the measuring part 15 of the device 1 there is a measuring channel 20 running in the axial direction and a radially adjoining deflecting channel 21, for example having an S shape intended.
  • the medium flowing in the suction line 4 enters the measuring channel 20 via an inlet mouth 22, for example, which has a rectangular cross section, and passes from the measuring channel 20 into the deflection channel 21 in order to leave it through a dashed, for example radial, outlet opening 23.
  • the measuring channel 20 has two side surfaces 24, 25 which are designed to converge in the axial direction towards the deflection channel 21, in the direction of a measuring channel axis 12 extending centrally in the measuring channel 20.
  • the measuring channel axis 12 of the measuring channel 20 and the axis 11 of the suction line 4 are oriented perpendicular to the plug axis 10.
  • a measuring element 28 for example in the middle of the measuring channel axis 12 is accommodated, which is for example in the form of a plate-shaped
  • Ceramic substrate is formed and is aligned with its side surfaces 29 parallel to the measuring channel axis 12 in order to flow around the medium flowing in the measuring channel 20. It is also possible, as disclosed for example in DE-OS 43 38 891, the measuring element 28 as a micromechanical
  • the tapering design of the measuring channel 20 has the effect that in the area of the measuring element 28 there is an almost undisturbed, uniform parallel flow which runs along the measuring channel axis 12 and is indicated in the drawing by corresponding arrows 18.
  • the measuring channel 20 with its measuring channel axis 12 is not aligned parallel to the axis 11 of the suction line 4, but is arranged rotated by an angle ⁇ with respect to the axis 11 or the medium flowing in the suction line 4.
  • the rotated installation position of the measuring part 15 or the measuring channel 20 results in that, downstream of the inlet mouth 22 on the circumference of the measuring part 15, a one-sided detachment region 30, indicated in the drawing by a line, is formed in the flow which is stable, in particular not from flow changes characterized flow state upstream of the inlet mouth 22 of the measuring channel 20 causes.
  • the detachment area 30 extends from the inlet opening 22 along an outer surface 31 of the measuring part 15 which extends downstream in the suction line 4, without the flow again being applied to the outer surface 31.
  • the detachment area 30 is essentially based on the flow 17 in the direction of the wall 2 of the suction line
  • the measuring element 28 does not change its position in the measuring channel 20 with the rotation of the measuring part 15, so it takes on the same inclination with respect to the axis 11 of the suction line 4 as the measuring channel axis 12.
  • the plug-in axis 10 can be provided as the axis of rotation for the rotated installation of the device 1. However, it is also possible to provide a different axis of rotation, for example offset to the plug-in axis 10.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The proposal is for a device (1) for measuring the volume of a flowing medium, especially for measuring the volume of the intake air in internal combustion engines, which is secured to an intake line (4), a measuring section (15) having a measuring channel (20) which projects into the intake line and a measuring component (28) fitted in the measuring channel (20) to measure the volume. The device (1) is mounted in such a way that the measuring section (15) with a measuring channel (20) is rotated through an angle α in relation to the medium flowing in the intake line (4). The invention is intended for measuring the volume of a flowing medium, especially the intake air in internal combustion engines.

Description

Vorrichtung zur Messung der Masse eines strömenden MediumsDevice for measuring the mass of a flowing medium
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zur Messung der Masse eines strömenden Mediums nach der Gattung des Anspruchs 1. Es ist schon eine Vorrichtung (DE-OS 44 07 209) bekannt, die zur Messung der Ansaugluftmasse einerThe invention relates to a device for measuring the mass of a flowing medium according to the preamble of claim 1. A device (DE-OS 44 07 209) is already known which is used to measure the intake air mass
Brennkraftmaschine vorgesehen ist und hierzu ein in einem Meßkanal untergebrachtes Meßelement besitzt. Das Meßelement ist zum Beispiel in Form eines Keramiksubstrats oder als mikromechanisches Bauteil ausgebildet. Die Vorrichtung hat eine schlanke, sich radial in Richtung einer Steckachse länglich erstreckende, quaderformige Gestalt und ist in eine Öffnung einer Wandung einer Ansaugleitung eingeführt. Die Wandung der Ansaugleitung begrenzt einen Strömungsquerschnitt, der im Fall einer zylindrischen Ansaugleitung etwa einen kreisrunden Querschnitt aufweist.Internal combustion engine is provided and for this purpose has a measuring element housed in a measuring channel. The measuring element is designed, for example, in the form of a ceramic substrate or as a micromechanical component. The device has a slender, cuboid shape that extends radially in the direction of a plug-in axis and is inserted into an opening in a wall of an intake line. The wall of the suction line delimits a flow cross section, which in the case of a cylindrical suction line has approximately a circular cross section.
Die Ansaugleitung stellt beispielsweise ein Ansaugrohr einer Brennkraftmaschine dar, durch das hindurch die Brennkraftmaschine Luft aus der Umgebung ansaugen kann. Die Vorrichtung ist in der Öffnung der Wandung der Ansaugleitung in ihrer radialen Lage derart fixiert, daß der Meßkanal des Meßteils der Vorrichtung parallel zum in der Ansaugleitung strömenden Medium ausgerichtet ist. In radialer Richtung ragt der Meßteil der Vorrichtung vorzugsweise etwa in die Mitte des Strömungsquerschnitts der Ansaugleitung hinein. Zur Halterung und radialen Lagefixierung der Vorrichtung an der Ansaugleitung sind beispielsweise in einem außerhalb der Ansaugleitung liegenden Gehäuseteil der Vorrichtung Öffnungen vorgesehen, in welche Schrauben zur Verbindung der Vorrichtung mit der Ansaugleitung eingeführt werden können.The intake line represents, for example, an intake pipe of an internal combustion engine, through which the internal combustion engine can draw in air from the environment. The radial position of the device is fixed in the opening of the wall of the suction line such that the measuring channel of the measuring part of the device is aligned parallel to the medium flowing in the suction line. In the radial direction, the measuring part of the device preferably protrudes approximately into the middle of the flow cross section of the suction line. To hold and fix the position of the device radially on the suction line are, for example, in a housing part of the device lying outside the suction line Openings are provided in which screws can be inserted to connect the device to the suction line.
Bei einer Massenherstellung der Vorrichtung beziehungsweise Anbau an die Ansaugleitung sind jedoch Einbautoleranzen unvermeidbar, die dazu führen, daß der Meßkanal des Meßteils der Vorrichtung nicht immer exakt zum in der Ansaugleitung strömenden Medium parallel ausgerichtet ist, sondern etwas davon abweichen kann. Eine Abweichung von der vorgesehenen parallelen Einbaulage des Meßkanals kann jedoch zu instabilen Strömungsverhältnissen am Meßteil beziehungsweise im Meßkanal führen, die beispielsweise durch einen Strömungsumschlag laminar-turbulent gekennzeichnet sind, so daß mehr oder weniger starke Streuungen der Kennlinien der verbauten Vorrichtungen auftreten können.In the case of mass production of the device or attachment to the suction line, however, installation tolerances are unavoidable, which lead to the measuring channel of the measuring part of the device not always being exactly parallel to the medium flowing in the suction line, but rather being able to deviate somewhat from it. A deviation from the intended parallel installation position of the measuring channel can, however, lead to unstable flow conditions on the measuring part or in the measuring channel, which are characterized, for example, by a laminar-turbulent flow change, so that more or less strong scattering of the characteristic curves of the installed devices can occur.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung zur Messung der Masse eines strömenden Mediums mit den kennzeichnenden Merkmalen desThe inventive device for measuring the mass of a flowing medium with the characterizing features of
Anspruchs 1 hat demgegenüber den Vorteil, daß aufgrund von Einbautoleranzen sich ergebende Streuungen der Kennlinien deutlich reduziert sind, so daß bei der Massenherstellung beziehungsweise Verbau der Vorrichtung im wesentlichen gleichbleibende Kennlinien ohne Streuungen erwartet werden können.Compared to this, claim 1 has the advantage that scattering of the characteristic curves resulting from installation tolerances are significantly reduced, so that essentially constant characteristic curves without scattering can be expected during mass production or installation of the device.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Vorrichtung möglich.Advantageous further developments and improvements of the device specified in claim 1 are possible through the measures listed in the subclaims.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Beschreibung des AusführungsbeispielsAn embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Description of the embodiment
In der Zeichnung ist in Schnittdarstellung eine Vorrichtung 1 teilweise gezeigt, die zur Messung der Masse eines strömenden Mediums, insbesondere der Ansaugluftmasse von Brennkraftmaschinen, dient. Der komplette Aufbau einer derartigen Vorrichtung ist beispielsweise der DE- OS 44 07 209 entnehmbar, deren Offenbarung Bestandteil der hier vorliegenden Patentanmeldung sein soll. Die Vorrichtung 1 hat vorzugsweise eine schlanke, sich radial in Richtung einer Steckachse 10 länglich erstreckende, quaderformige Gestalt. Die Steckachse 10 ist in der Zeichnung durch einen Punkt gekennzeichnet und erstreckt sich senkrecht zur Zeichenebene in die Zeichenebene der Zeichnung hinein. Die Vorrichtung 1 ist in bekannter Weise in eine aus einer Wandung 2 ausgenommenen Öffnung einer Ansaugleitung 4 eingeführt und an der Ansaugleitung 4 beispielsweise mittels einer Schraubverbindung befestigt. Die Ansaugleitung 4 stellt zum Beispiel ein Ansaugrohr einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine dar, durch das hindurch die Brennkraftmaschine Luft aus der Umgebung ansaugen kann. Die Ansaugleitung 4 begrenzt einen Strömungsquerschnitt, der im Fall einer zylindrischen Ansaugleitung 4 etwa einen kreisrunden Querschnitt aufweist, in dessen Mitte in axialer Richtung in Richtung des durch Pfeile 17 gekennzeichneten strömenden Mediums, parallel zu einer Innenwandung 3 der Ansaugleitung 4, sich eine Achse 11 erstreckt. Die Vorrichtung 1 hat eine radiale Erstreckung, so daß ein in der Zeichnung schraffiert dargestelltes, quaderförmiges Meßteil 15 der Vorrichtung 1 mit rechteckförmigem Querschnitt beispielsweise in die Mitte des Strömungsquerschnitts der Ansaugleitung 4 hineinragt.In the drawing, a device 1 is partially shown in a sectional view, which is used to measure the mass of a flowing medium, in particular the intake air mass of internal combustion engines. The complete structure of such a device can be found, for example, in DE-OS 44 07 209, the disclosure of which is to be part of the present patent application. The device 1 preferably has a slender, cuboid shape that extends radially in the direction of a plug-in axis 10. The plug-in axis 10 is identified by a point in the drawing and extends perpendicular to the drawing plane into the drawing plane of the drawing. The device 1 is introduced in a known manner into an opening of a suction line 4 which is recessed from a wall 2 and fastened to the suction line 4, for example by means of a screw connection. The intake line 4 represents, for example, an intake pipe of a mixture-compressing, spark-ignited internal combustion engine, through which the internal combustion engine can draw in air from the environment. The suction line 4 delimits a flow cross section which, in the case of a cylindrical suction line 4, has an approximately circular cross section, in the middle of which an axis 11 extends in the axial direction in the direction of the flowing medium indicated by arrows 17, parallel to an inner wall 3 of the suction line 4 . The device 1 has a radial extension, so that a cuboid measuring part 15 of the device 1 with a rectangular cross section, shown hatched in the drawing, projects, for example, into the middle of the flow cross section of the suction line 4.
Im Meßteil 15 der Vorrichtung 1 ist ein in axialer Richtung verlaufender Meßkanal 20 und ein sich radial anschließender, beispielsweise eine S-Form aufweisender Umlenkkanal 21 vorgesehen. Das in der Ansaugleitung 4 strömende Medium tritt über eine zum Beispiel einen rechteckigen Querschnitt aufweisenden Einlaßmündung 22 in den Meßkanal 20 ein und gelangt vom Meßkanal 20 in den Umlenkkanal 21, um diesen aus einer gestrichelt dargestellten, beispielsweise radialen Auslaßöffnung 23 zu verlassen. Der Meßkanal 20 hat zwei Seitenflächen 24, 25, die in axialer Richtung zum Umlenkkanal 21 hin, in Richtung einer mittig im Meßkanal 20 sich erstreckenden Meßkanalachse 12 aufeinander zulaufend ausgebildet sind. Die Meßkanalachse 12 des Meßkanals 20 sowie die Achse 11 der Ansaugleitung 4 sind senkrecht zur Steckachse 10 orientiert. Im Meßkanal 20 ist ein von der Meßkanalachse 12 beispielsweise mittig in zwei gleich große Hälften aufgeteiltes Meßelement 28 untergebracht, das beispielsweise in Form eines plattenformigenIn the measuring part 15 of the device 1 there is a measuring channel 20 running in the axial direction and a radially adjoining deflecting channel 21, for example having an S shape intended. The medium flowing in the suction line 4 enters the measuring channel 20 via an inlet mouth 22, for example, which has a rectangular cross section, and passes from the measuring channel 20 into the deflection channel 21 in order to leave it through a dashed, for example radial, outlet opening 23. The measuring channel 20 has two side surfaces 24, 25 which are designed to converge in the axial direction towards the deflection channel 21, in the direction of a measuring channel axis 12 extending centrally in the measuring channel 20. The measuring channel axis 12 of the measuring channel 20 and the axis 11 of the suction line 4 are oriented perpendicular to the plug axis 10. In the measuring channel 20, a measuring element 28, for example in the middle of the measuring channel axis 12, is accommodated, which is for example in the form of a plate-shaped
Keramiksubstrats ausgebildet und mit seinen Seitenflächen 29 parallel zur Meßkanalachse 12 ausgerichtet ist, um vom im Meßkanal 20 strömenden Medium umströmt zu werden. Es ist auch möglich, wie zum Beispiel in der DE-OS 43 38 891 offenbart ist, das Meßelement 28 als mikromechanischesCeramic substrate is formed and is aligned with its side surfaces 29 parallel to the measuring channel axis 12 in order to flow around the medium flowing in the measuring channel 20. It is also possible, as disclosed for example in DE-OS 43 38 891, the measuring element 28 as a micromechanical
Bauteil mit einer dielektrische Membran auszubilden. Die verjüngende Ausgestaltung des Meßkanals 20 bewirkt, daß im Bereich des Meßelements 28 eine nahezu ungestörte, gleichmäßige Parallelströmung vorhanden ist, die entlang der Meßkanalachse 12 verläuft und in der Zeichnung durch entsprechende Pfeile 18 gekennzeichnet ist.Form component with a dielectric membrane. The tapering design of the measuring channel 20 has the effect that in the area of the measuring element 28 there is an almost undisturbed, uniform parallel flow which runs along the measuring channel axis 12 and is indicated in the drawing by corresponding arrows 18.
Erfindungsgemäß ist der Meßkanal 20 mit seiner Meßkanalachse 12 nicht parallel zur Achse 11 der Ansaugleitung 4 ausgerichtet, sondern gegenüber der Achse 11 beziehungsweise dem in der Ansaugleitung 4 strömenden Medium um einen Winkel α gedreht angeordnet. Durch die gedrehte Einbaulage des Meßteils 15 beziehungsweise des Meßkanals 20 ergibt sich, daß stromabwärts der Einlaßmündung 22 am Umfang des Meßteils 15 ein in der Zeichnung durch eine Linie angedeuteter, einseitiger Ablösebereich 30 in der Strömung entsteht, der einen stabilen, insbesondere nicht von Strömungsumschlägen gekennzeichneten Strömungszustand stromaufwärts der Einlaßmündung 22 des Meßkanals 20 bewirkt. Der AblösebereichAccording to the invention, the measuring channel 20 with its measuring channel axis 12 is not aligned parallel to the axis 11 of the suction line 4, but is arranged rotated by an angle α with respect to the axis 11 or the medium flowing in the suction line 4. The rotated installation position of the measuring part 15 or the measuring channel 20 results in that, downstream of the inlet mouth 22 on the circumference of the measuring part 15, a one-sided detachment region 30, indicated in the drawing by a line, is formed in the flow which is stable, in particular not from flow changes characterized flow state upstream of the inlet mouth 22 of the measuring channel 20 causes. The peel area
30 erstreckt sich ausgehend von der Einlaßmündung 22 entlang einer sich nach stromabwärts in der Ansaugleitung 4 erstreckenden Außenfläche 31 des Meßteils 15, ohne daß es zu einem Wiederanlegen der Strömung an der Außenfläche 31 kommt. Der Ablösebereich 30 ist im wesentlichen auf die aus der Strömung 17 in Richtung zur Wandung 2 der Ansaugleitung30 extends from the inlet opening 22 along an outer surface 31 of the measuring part 15 which extends downstream in the suction line 4, without the flow again being applied to the outer surface 31. The detachment area 30 is essentially based on the flow 17 in the direction of the wall 2 of the suction line
4 weggedrehten Seite des Meßteils 15 begrenzt, die Außenfläche 31 liegt also im Windschatten der rechten vorderen Kante des Meßteils 15. An der gegenüberliegenden, der Strömung 17 zugewandten Seite des Meßteils 15 beziehungsweise an dessen der Strömung 17 zugewandten Außenfläche 32 ergibt sich kein derartiger Ablösebereich oder nur ein vernachlässigbarer kleiner Ablösebereich. Die Außenflächen 31 und 32 verlaufen parallel zur Meßkanalachse 12. Es hat sich dabei herausgestellt, daß bei der beschriebenen Verdrehung des Meßteils 15 sich ein stabiler Strömungszustand stromaufwärts der Einlaßmündung 22 bei radialen Einbaulagen des Meßkanals 20 dann wirksam einstellt, wenn eine radiale Drehlage des Meßkanals 20 mit einem Winkel α gegenüber dem in der Ansaugleitung 4 strömenden Medium 17 von etwa 2 Grad bis etwa 10 Grad, vorzugsweise von etwa 4 Grad, gewählt wird. Wie in der Zeichnung dargestellt ist, ist der Winkel α von der4 turned away side of the measuring part 15, the outer surface 31 is therefore in the slipstream of the right front edge of the measuring part 15. On the opposite side of the measuring part 15 facing the flow 17 or on its outer surface 32 facing the flow 17, there is no such separation area or only a negligible small separation area. The outer surfaces 31 and 32 run parallel to the measuring channel axis 12. It has been found that with the described rotation of the measuring part 15, a stable flow state upstream of the inlet mouth 22 is effective when the measuring channel 20 is in the radial installation position when the measuring channel 20 is in a radial rotational position with an angle α relative to the medium 17 flowing in the suction line 4 is selected from approximately 2 degrees to approximately 10 degrees, preferably approximately 4 degrees. As shown in the drawing, the angle α is from
Meßkanalachse 12 und der Achse 11 der Ansaugleitung 4 eingeschlossen. Da das in der Ansaugleitung 4 axial strömende Medium im Meßkanal 20 im wesentlichen parallel zur Meßkanalachse 12 des Meßkanals 20 strömt, schließt es daher gegenüber dem in der Ansaugleitung 4 strömenden Medium ebenfalls den Winkel α ein. Das Meßelement 28 ändert mit der Verdrehung des Meßteils 15 seine Lage im Meßkanal 20 nicht, es nimmt also die gleiche Neigung gegenüber der Achse 11 der Ansaugleitung 4 ein, wie die Meßkanalachse 12.Measuring channel axis 12 and the axis 11 of the suction line 4 included. Since the medium flowing axially in the suction line 4 in the measuring channel 20 flows essentially parallel to the measuring channel axis 12 of the measuring channel 20, it therefore also includes the angle α with respect to the medium flowing in the suction line 4. The measuring element 28 does not change its position in the measuring channel 20 with the rotation of the measuring part 15, so it takes on the same inclination with respect to the axis 11 of the suction line 4 as the measuring channel axis 12.
Aufgrund der im vorgesehenen Winkelbereich α vom etwa 2 Grad bis 10 Grad sich einstellenden, stabilen Strömungsverhältnisse stromauf des Meßkanals 20 wirken sich Einbautoleranzen, die zu einer weiteren Änderung des Winkels α beziehungsweise der radialen Drehlage des Meßkanals 20 führen, weniger auf die Strömung im Meßkanal 20 und damit auf das vom Meßelement 28 abgegebene elektrische Signal aus, als dies bei einer parallelen Ausrichtung des Meßkanals 20 der Fall wäre. Daher sind bei der Massenherstellung beziehungsweise Verbau der Vorrichtung 1 keine oder nur unwesentliche Streuungen der Kennlinien der verbauten Vorrichtungen 1 zu erwarten. In der Zeichnung ist eine entgegen dem Uhrzeigersinn gedrehte Einbaulage der Vorrichtung 1 gezeigt. Es ist selbstverständlich auch möglich, die Vorrichtung 1 mit im Uhrzeigersinn gedrehter Einbaulage einzubauen. Wie in der Zeichnung weiter dargestellt ist, kann als Drehachse für den gedrehten Einbau der Vorrichtung 1 zum Beispiel die Steckachse 10 vorgesehen sein. Es ist aber auch möglich, eine andere, beispielsweise zur Steckachse 10 versetzte Drehachse vorzusehen. Because of the stable in the intended angular range α from about 2 degrees to 10 degrees Flow conditions upstream of the measuring channel 20 have installation tolerances which lead to a further change in the angle α or the radial rotational position of the measuring channel 20, less on the flow in the measuring channel 20 and thus on the electrical signal emitted by the measuring element 28 than in the case of a parallel one Alignment of the measuring channel 20 would be the case. Therefore, no or only insignificant scattering of the characteristic curves of the installed devices 1 is to be expected during the mass production or installation of the device 1. In the drawing, an anti-clockwise installation position of the device 1 is shown. It is of course also possible to install the device 1 with the installation position turned clockwise. As is further shown in the drawing, the plug-in axis 10 can be provided as the axis of rotation for the rotated installation of the device 1. However, it is also possible to provide a different axis of rotation, for example offset to the plug-in axis 10.

Claims

Patentansprüche claims
1. Vorrichtung zur Messung der Masse eines strömenden Mediums, insbesondere zur Messung der Ansaugluftmasse von Brennkraftmaschinen, die an einer Ansaugleitung befestigt ist, mit einem einen Meßkanal aufweisenden Meßteil in die Ansaugleitung ragt und ein im Meßkanal untergebrachtes Meßelement zur Messung der Masse aufweist, dadurch gekennzeichnet, daß der Anbau der Vorrichtung (1) an die Ansaugleitung (4) derart erfolgt, daß der Meßteil (15) mit dem Meßkanal (20) gegenüber dem in der Ansaugleitung (4) strömenden Medium um einen Winkel α gedreht ist.1. Device for measuring the mass of a flowing medium, in particular for measuring the intake air mass of internal combustion engines, which is attached to an intake line, with a measuring part having a measuring channel protrudes into the intake line and has a measuring element housed in the measuring channel for measuring the mass, characterized that the device (1) is attached to the suction line (4) in such a way that the measuring part (15) with the measuring channel (20) is rotated by an angle α relative to the medium flowing in the suction line (4).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Winkel α etwa 2 Grad bis etwa 10 Grad beträgt.2. Device according to claim 1, characterized in that the angle α is about 2 degrees to about 10 degrees.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Winkel α etwa 4 Grad beträgt. 3. Device according to claim 1, characterized in that the angle α is approximately 4 degrees.
EP96928322A 1995-12-21 1996-07-24 Device for measuring the volume of a flowing medium Withdrawn EP0821781A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19547915A DE19547915A1 (en) 1995-12-21 1995-12-21 Device for measuring the mass of a flowing medium
DE19547915 1995-12-21
PCT/DE1996/001359 WO1997023767A1 (en) 1995-12-21 1996-07-24 Device for measuring the volume of a flowing medium

Publications (1)

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EP0821781A1 true EP0821781A1 (en) 1998-02-04

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EP96928322A Withdrawn EP0821781A1 (en) 1995-12-21 1996-07-24 Device for measuring the volume of a flowing medium

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US (1) US5925820A (en)
EP (1) EP0821781A1 (en)
JP (1) JPH11501126A (en)
KR (1) KR100254718B1 (en)
CN (1) CN1083569C (en)
DE (1) DE19547915A1 (en)
RU (1) RU2179708C2 (en)
WO (1) WO1997023767A1 (en)

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DE19741031A1 (en) * 1997-09-18 1999-03-25 Bosch Gmbh Robert Device to measure mass of flowing medium, e.g. intake air of IC engine
JP4811695B2 (en) 2000-05-30 2011-11-09 株式会社デンソー Flow measuring device
DE10046943A1 (en) * 2000-09-21 2002-04-18 Siemens Ag Mass flow meter
DE10144327C1 (en) * 2001-09-10 2002-12-12 Siemens Ag Airflow sensor for measuring air mass sucked in by an internal combustion engine has a plug-in area with an inlet opening for an air stream intake and an outlet opening for the air stream
JP4106224B2 (en) * 2002-03-14 2008-06-25 株式会社デンソー Flow measuring device
CN100402988C (en) * 2003-04-04 2008-07-16 欧姆龙株式会社 Flow rate-measuring device
JP4034251B2 (en) * 2003-09-26 2008-01-16 株式会社ケーヒン Intake device for internal combustion engine and method for measuring intake air amount
DE102006045657A1 (en) 2006-09-27 2008-04-03 Robert Bosch Gmbh Plug-in sensor with optimized flow outlet
DE102012100087A1 (en) * 2012-01-05 2013-07-11 Pierburg Gmbh Device for determining a gas mass flow
DE102019115558B3 (en) * 2019-06-07 2020-10-01 Endress+Hauser Flowtec Ag Thermal flow meter

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Also Published As

Publication number Publication date
DE19547915A1 (en) 1997-06-26
JPH11501126A (en) 1999-01-26
RU2179708C2 (en) 2002-02-20
KR19980702337A (en) 1998-07-15
CN1164892A (en) 1997-11-12
KR100254718B1 (en) 2000-05-01
WO1997023767A1 (en) 1997-07-03
CN1083569C (en) 2002-04-24
US5925820A (en) 1999-07-20

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