WO2002025223A1 - Mass flowmeter - Google Patents

Mass flowmeter Download PDF

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Publication number
WO2002025223A1
WO2002025223A1 PCT/DE2001/003639 DE0103639W WO0225223A1 WO 2002025223 A1 WO2002025223 A1 WO 2002025223A1 DE 0103639 W DE0103639 W DE 0103639W WO 0225223 A1 WO0225223 A1 WO 0225223A1
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WO
WIPO (PCT)
Prior art keywords
main
channel
flow
mass flow
outlet opening
Prior art date
Application number
PCT/DE2001/003639
Other languages
German (de)
French (fr)
Inventor
Stefan Pesahl
Frank Steuber
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2002025223A1 publication Critical patent/WO2002025223A1/en

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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
    • 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 mass flow meter that is suitable for insertion into a main channel in which a mass flow flows.
  • a mass flow meter is known from US Pat. No. 5,892,146 which is inserted into a main flow channel.
  • the mass flow meter has a housing in which an L-shaped auxiliary channel is formed and in which sensor elements are arranged.
  • the auxiliary duct has an inlet opening and an outlet opening at its downstream end. The outlet opening is enlarged compared to the cross section of the auxiliary duct.
  • the air in the main duct partly flows directly into the auxiliary duct and to another part it flows against the region of the inlet opening formed by a baffle and is swirled there strongly and then flows into the auxiliary duct.
  • the inlet opening formed with the baffle plate represents a very high flow resistance in the main channel, so that there is a high pressure loss.
  • the mass flow flows out of the outlet opening almost perpendicular to the main flow direction in the main channel and is therefore almost immediately exposed to the main flow.
  • the flow in the auxiliary channel is thus blocked in the region of the outlet opening, which can lead to a falsification of the measurement signal of the sensor elements.
  • the object of the invention is to make a mass flow meter compact and at the same time to ensure that the mass flow meter represents an extremely low flow resistance for the mass flow.
  • the object is achieved by the features of the independent claim.
  • Advantageous developments of the invention are characterized in the subclaims.
  • the invention is characterized in that a very large cross-section of the main flow channel is detected through the funnel-shaped inlet opening of the auxiliary channel and so when the mass flow is detected, averaging over local fluctuations in the flow velocity of the mass flow takes place in the main channel and at the same time by increasing the Flow velocity in the subsequent auxiliary channel an improved measurement signal quality is achieved.
  • the funnel-shaped design of the inlet opening also achieves a flow-wise favorable flow guidance into the auxiliary channel, which is equivalent to a reduction in the flow resistance.
  • the outlet opening of the auxiliary channel is designed such that it is in the slipstream of the inlet opening in the main flow direction of the mass flow in the main channel.
  • the mass flow meter can be made extremely compact, since on the one hand the funnel-shaped inlet opening is formed by the housing and at the same time this creates the required slipstream for the outlet opening.
  • the single figure shows a mass flow meter la, which is inserted into a recess in a main channel 2.
  • the main duct is preferably part of an intake tract
  • a flowing medium preferably air, which flows through the main channel 2 in the main flow direction 12 indicated by the arrow 12.
  • the mass flow meter la has a housing 1, in which an inverted U-shaped auxiliary channel is formed.
  • the auxiliary channel has an inlet opening 4, a first channel section 5 and a second channel section 8 and a third channel section 9 and an outlet opening 10.
  • a first and second sensor element 6, 7 are arranged, from whose measurement signals a measurement signal of the mass flow in the Main channel 2 is derived.
  • the inlet opening 4 is funnel-shaped in the housing 1.
  • the cross section of the funnel-shaped inlet opening 4 at the upstream end is preferably dimensioned such that the mass flow entering through the funnel-shaped inlet opening 4 is representative of the total mass flow in the main channel 2.
  • the funnel shape of the inlet opening 4 results in favorable flow guidance.
  • individual flow lines are indicated by dashed lines.
  • the cross section of the inlet opening 4 at its upstream end is larger than the cross section of the auxiliary duct in its first duct section 5. This has the consequence that the flow in the first duct section 5 is accelerated. This has the advantage that the signal quality of the measurement signals detected by the sensor elements 6 and 7 is improved.
  • the first and third channel sections 5, 8 are essentially perpendicular to the main flow direction 12.
  • the first and second channel sections 5, 8 communicate via a third channel section 9, in which the flow is deflected.
  • the mass flow thus flows from the inlet opening 4 through the first channel section 5, to the second channel section 8, further to the third channel section 9 and finally flows back into the main channel 2 through the outlet opening 10.
  • the outlet opening 10 is formed in the housing 1 of the mass flow meter la such that it is in the slipstream of a funnel wall 11 which delimits a part of the inlet opening.
  • the mass flow in the third channel section 9 can flow almost undisturbed from the outlet opening 10 back into the main channel 2 in its direction of flow, which is essentially perpendicular to the main flow direction 12, its direction of flow gradually adapting again to the main flow direction 12.
  • the fact that the outlet opening 10 is in the slipstream of the funnel wall 11 in relation to the main flow in the main flow direction 12 in the main duct 2 prevents the flow in the main duct 2 from causing a flow backlog in the region of the outlet opening 10.
  • the funnel wall 11 thus acts as a flow divider and generates a negative pressure in the main duct 2 in the region of the outlet opening 10. This ensures that the flow can flow through the U-shaped auxiliary duct almost undisturbed. This has the advantage that the measurement signal of the sensor elements 6 and 7 is of high quality and at the same time the pressure loss can be kept low.
  • the measurement signal of the sensor elements 6 and 7 is of high quality and at the same time the pressure loss can be kept low.
  • the main channel 2 flowing mass flow is only insignificantly disturbed in its flow by the mass flow which flows back into the main channel 2 through the outlet opening 10.
  • a particularly good flow guidance takes place when an area of the outer contour of the funnel wall 11 opens into the outlet opening 10 and this area tapers along the main flow direction 12. This also prevents vortices that can affect the sensor signal negatively from backflows, such as occur with pulsations.

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

Abstract

The invention relates to a mass flowmeter, which is suited for placing inside a main channel (2), in which a mass flow flows in a main flowing direction (12). Said mass flowmeter comprises a housing (1). An auxiliary channel is provided inside the housing (1) and comprises an inlet opening (4) and an outlet opening (10). At least one sensor element (6, 7) is arranged inside said auxiliary channel. The inlet opening (4) is funnel-shaped. The outlet opening (10) is, in the main flowing direction (12) of the mass flow, located in an area that is situated behind the inlet opening (4) whereby being sheltered from the wind.

Description

Beschreibungdescription
MassenstrommesserMass flow meter
Die Erfindung betrifft einen Massenstrommesser, der geeignet ist zum Einsetzen in einen Hauptkanal, in dem ein Massenstrom strömt.The invention relates to a mass flow meter that is suitable for insertion into a main channel in which a mass flow flows.
Aus der US 5 892 146 ist ein Massenstrommesser bekannt, der in einen Hauptströmungskanal eingesetzt ist. Der Massenstrommesser hat ein Gehäuse, in dem ein L-förmiger Hilfskanal ausgebildet ist und in dem Sensorelemente angeordnet sind. Der Hilfskanal hat eine Einlassöffnung und an seinem stromabwär- tigen Ende eine Auslassöffnung. Die Auslassöffnung ist ver- größert im Vergleich zu dem Querschnitt des Hilfskanals. Die Luft in dem Hauptkanal strömt teilweise direkt in den Hilfskanal und zu einem anderen Teil strömt sie gegen den durch eine Pralllatte gebildeten Bereich der Einlassöffnung und wird dort stark verwirbelt und strömt anschließend in den Hilfskanal. Die mit der Prallplatte ausgebildete Einlassöffnung stellt einen sehr hohen Strömungswiderstand in dem Hauptkanal dar, so dass es zu einem hohen Druckverlust kommt. Der Massenstrom strömt aus der Auslassöffnung nahezu senkrecht zur Hauptströmungsrichtung in dem Hauptkanal und ist somit nahezu unmittelbar der Hauptströmung ausgesetzt. Somit wird die Strömung im Hilfskanal im Bereich der Auslassöffnung gestaut, was zu einer Verfälschung des Messsignals der Sensorelemente führen kann.A mass flow meter is known from US Pat. No. 5,892,146 which is inserted into a main flow channel. The mass flow meter has a housing in which an L-shaped auxiliary channel is formed and in which sensor elements are arranged. The auxiliary duct has an inlet opening and an outlet opening at its downstream end. The outlet opening is enlarged compared to the cross section of the auxiliary duct. The air in the main duct partly flows directly into the auxiliary duct and to another part it flows against the region of the inlet opening formed by a baffle and is swirled there strongly and then flows into the auxiliary duct. The inlet opening formed with the baffle plate represents a very high flow resistance in the main channel, so that there is a high pressure loss. The mass flow flows out of the outlet opening almost perpendicular to the main flow direction in the main channel and is therefore almost immediately exposed to the main flow. The flow in the auxiliary channel is thus blocked in the region of the outlet opening, which can lead to a falsification of the measurement signal of the sensor elements.
Die Aufgabe der Erfindung ist es, einen Massenstrommesser kompakt auszubilden und gleichzeitig sicherzustellen, dass der Massenstrommesser einen äußerst geringen Strömungswiderstand für den Massenstrom darstellt.The object of the invention is to make a mass flow meter compact and at the same time to ensure that the mass flow meter represents an extremely low flow resistance for the mass flow.
Die Aufgabe wird gelöst durch die Merkmale des unabhängigen Patentanspruchs. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet. Die Erfindung zeichnet sich dadurch aus, dass durch die trichterförmig ausgebildete Einlassöffnung des Hilfskanals ein sehr großer Querschnitt des Hauptströmungskanals erfasst wird und so beim Erfassen des Massenstroms eine Mittelung ü- ber lokale Schwankungen der Strömungsgeschwindigkeit des Massenstroms in dem Hauptkanal erfolgt und gleichzeitig durch die Erhöhung der Strömungsgeschwindigkeit im anschließenden Hilfskanal eine verbesserte Messsignalgüte erreicht wird. Durch die trichterförmige Ausbildung der Einlassöffnung wird ferner eine strömungstechnisch günstige Strömungsführung hinein in den Hilfskanal erreicht, was einer Verringerung des Strömungswiderstandes gleichkommt. Die Auslassöffnung des Hilfskanals ist so ausgebildet, dass sie in der Hauptströ- mungsrichtung des Massenstroms in dem Hauptkanal im Windschatten der Einlassöffnung ist. Dadurch ist gewährleistet, dass der Massenstrom ungestört von der Strömung des Massenstroms in der Hauptströmungsrichtung in dem Hauptkanal aus der Auslassöffnung zurück in den Hauptkanal strömen kann. Der Massenstrommesser kann dabei äußerst kompakt ausgebildet werden, da durch das Gehäuse einerseits die trichterförmige Einlassöffnung ausgebildet ist und dies gleichzeitig den erforderlichen Windschatten für die Auslassöffnung erzeugt.The object is achieved by the features of the independent claim. Advantageous developments of the invention are characterized in the subclaims. The invention is characterized in that a very large cross-section of the main flow channel is detected through the funnel-shaped inlet opening of the auxiliary channel and so when the mass flow is detected, averaging over local fluctuations in the flow velocity of the mass flow takes place in the main channel and at the same time by increasing the Flow velocity in the subsequent auxiliary channel an improved measurement signal quality is achieved. The funnel-shaped design of the inlet opening also achieves a flow-wise favorable flow guidance into the auxiliary channel, which is equivalent to a reduction in the flow resistance. The outlet opening of the auxiliary channel is designed such that it is in the slipstream of the inlet opening in the main flow direction of the mass flow in the main channel. This ensures that the mass flow can flow undisturbed by the flow of the mass flow in the main flow direction in the main channel from the outlet opening back into the main channel. The mass flow meter can be made extremely compact, since on the one hand the funnel-shaped inlet opening is formed by the housing and at the same time this creates the required slipstream for the outlet opening.
Ausführungsbeispiele der Erfindung sind anhand der schematischen Zeichnung näher erläutert.Embodiments of the invention are explained in more detail with reference to the schematic drawing.
Die einzige Figur zeigt einen Massenstrommesser la, der in eine Ausnehmung eines Hauptkanals 2 eingesteckt ist. Der Hauptkanal ist bevorzugt Teil eines Ansaugtraktes einerThe single figure shows a mass flow meter la, which is inserted into a recess in a main channel 2. The main duct is preferably part of an intake tract
Brennkraftmaschine. In dem Hauptkanal befindet sich ein strömendes Medium, vorzugsweise Luft, das in der mit dem Pfeil 12 gekennzeichneten Hauptströmungsrichtung 12 durch den Hauptkanal 2 strömt.Internal combustion engine. In the main channel there is a flowing medium, preferably air, which flows through the main channel 2 in the main flow direction 12 indicated by the arrow 12.
Der Massenstrommesser la hat ein Gehäuse 1, in dem ein umgekehrt U-förmiger Hilfskanal ausgebildet ist. Der Hilfskanal hat eine Einlassöffnung 4, einen ersten Kanalabschnitt 5 und einen zweiten Kanalabschnitt 8 und einen dritten Kanalabschnitt 9 und eine Auslassöffnung 10. In dem ersten Kanalabschnitt sind ein erstes und zweites Sensorelement 6, 7 ange- ordnet, aus deren Messsignalen ein Messsignal des Massenstroms in dem Hauptkanal 2 abgeleitet wird.The mass flow meter la has a housing 1, in which an inverted U-shaped auxiliary channel is formed. The auxiliary channel has an inlet opening 4, a first channel section 5 and a second channel section 8 and a third channel section 9 and an outlet opening 10. In the first channel section a first and second sensor element 6, 7 are arranged, from whose measurement signals a measurement signal of the mass flow in the Main channel 2 is derived.
Die Einlassöffnung 4 ist trichterförmig in dem Gehäuse 1 ausgebildet. Durch geeignete Wahl der Trichterform wird ein ge- eignet großer Teil des Querschnitts des Hauptkanals erfasst und somit die Strömung in diesem Bereich in den U-förmigen Hilfskanal geleitet. Der Querschnitt der trichterförmigen Einlassöffnung 4 am stromaufwärtigen Ende wird dabei vorzugsweise so dimensioniert, dass der durch die trichterförmige Einlassöffnung 4 eintretende Massenstrom repräsentativ ist für den Gesamtmassenstrom in dem Hauptkanal 2. Durch die Trichterform der Einlassöffnung 4 erfolgt eine günstige Strömungsführung. In der Figur sind einzelne Strömungslinien durch gestrichelte Linien angedeutet.The inlet opening 4 is funnel-shaped in the housing 1. By suitably selecting the funnel shape, a suitably large part of the cross section of the main channel is recorded and the flow in this area is thus directed into the U-shaped auxiliary channel. The cross section of the funnel-shaped inlet opening 4 at the upstream end is preferably dimensioned such that the mass flow entering through the funnel-shaped inlet opening 4 is representative of the total mass flow in the main channel 2. The funnel shape of the inlet opening 4 results in favorable flow guidance. In the figure, individual flow lines are indicated by dashed lines.
Der Querschnitt der Einlassöffnung 4 an ihrem stromaufwärtigen Ende ist größer als der Querschnitt des Hilfskanals in seinem ersten Kanalabschnitt 5. Diese hat zur Folge, dass die Strömung in dem ersten Kanalabschnitt 5 beschleunigt wird. Dies hat den Vorteil, dass die Signalgüte der durch die Sensorelemente 6 und 7 erfassten Messsignale verbessert ist.The cross section of the inlet opening 4 at its upstream end is larger than the cross section of the auxiliary duct in its first duct section 5. This has the consequence that the flow in the first duct section 5 is accelerated. This has the advantage that the signal quality of the measurement signals detected by the sensor elements 6 and 7 is improved.
Die ersten und dritten Kanalabschnitte 5, 8 sind im wesentlichen senkrecht zur Hauptströmungsrichtung 12 ausgebildet. Die ersten und zweiten Kanalabschnitte 5,8 kommunizieren über einen dritten Kanalabschnitt 9, in dem die Umlenkung der Strömung erfolgt. Der Massenstrom strömt somit von der Einlassöffnung 4 durch den ersten Kanalabschnitt 5, hin zum zweiten Kanalabschnitt 8, weiter zum dritten Kanalabschnitt 9 und strömt schließlich zurück in den Hauptkanal 2 durch die Auslassöffnung 10. Die Auslassöffnung 10 ist so in dem Gehäuse 1 des Massenstrommessers la ausgebildet, dass sie im Windschatten einer Trichterwand 11 ist, die einen Teil der Einlassöffnung begrenzt. Dadurch kann der Massenstrom in den dritten Kanalab- schnitt 9 in seiner Strömungsrichtung, die im wesentlichen senkrecht Hauptströmungsrichtung 12 ist, nahezu ungestört aus der Auslassöffnung 10 zurück in den Hauptkanal 2 strömen, wobei sich seine Strömungsrichtung allmählich wieder der Hauptströmungsrichtung 12 angleicht. Dadurch dass die Auslassöff- nung 10 im Windschatten der Trichterwand 11 im Bezug auf die Hauptströmung in Hauptströmungsrichtung 12 im Hauptkanal 2 ist, ist verhindert, dass die Strömung im Hauptkanal 2 einen Strömungsstau im Bereich der Auslassöffnung 10 hervorruft. Die Trichterwand 11 wirkt so als Strömungsteiler und erzeugt im Bereich der Auslassöffnung 10 einen Unterdruck im Hauptkanal 2. Dadurch ist gewährleistet, dass die Strömung durch den U-förmigen Hilfskanal nahezu ungestört strömen kann. Dies hat den Vorteil, dass das Messsignal der Sensorelemente 6 und 7 eine hohe Güte aufweist und gleichzeitig der Druckverlust ge- ring gehalten werden kann. Zudem wird auch der durch denThe first and third channel sections 5, 8 are essentially perpendicular to the main flow direction 12. The first and second channel sections 5, 8 communicate via a third channel section 9, in which the flow is deflected. The mass flow thus flows from the inlet opening 4 through the first channel section 5, to the second channel section 8, further to the third channel section 9 and finally flows back into the main channel 2 through the outlet opening 10. The outlet opening 10 is formed in the housing 1 of the mass flow meter la such that it is in the slipstream of a funnel wall 11 which delimits a part of the inlet opening. As a result, the mass flow in the third channel section 9 can flow almost undisturbed from the outlet opening 10 back into the main channel 2 in its direction of flow, which is essentially perpendicular to the main flow direction 12, its direction of flow gradually adapting again to the main flow direction 12. The fact that the outlet opening 10 is in the slipstream of the funnel wall 11 in relation to the main flow in the main flow direction 12 in the main duct 2 prevents the flow in the main duct 2 from causing a flow backlog in the region of the outlet opening 10. The funnel wall 11 thus acts as a flow divider and generates a negative pressure in the main duct 2 in the region of the outlet opening 10. This ensures that the flow can flow through the U-shaped auxiliary duct almost undisturbed. This has the advantage that the measurement signal of the sensor elements 6 and 7 is of high quality and at the same time the pressure loss can be kept low. In addition, the
Hauptkanal 2 strömende Massenstrom nur unwesentlich in seiner Strömung durch den Massenstrom gestört, der durch die Auslassöffnung 10 zurück in den Hauptkanal 2 strömt. Dabei erfolgt eine besonders gute Strömungsführung, wenn ein Bereich der Außenkontur der Trichterwand 11 in die Auslassöffnung 10 mündet und dieser Bereich sich entlang der Hauptströmungsrichtung 12 verjüngt. Dadurch auch verhindert, dass sich bei Rückströmungen - wie sie bei Pulsationen auftreten - sich Wirbel bilden, die das Sensorsignal negativ beeinflussen kön- nen. The main channel 2 flowing mass flow is only insignificantly disturbed in its flow by the mass flow which flows back into the main channel 2 through the outlet opening 10. A particularly good flow guidance takes place when an area of the outer contour of the funnel wall 11 opens into the outlet opening 10 and this area tapers along the main flow direction 12. This also prevents vortices that can affect the sensor signal negatively from backflows, such as occur with pulsations.

Claims

Patentansprüche claims
1. Massenstrommesser, der geeignet ist zum Einsetzen in einen Hauptkanal (2) , in dem ein Massenstrom in einer Hauptströ- mungsrichtung (12) strömt, mit einem Gehäuse (1), in dem ein Hilfskanal ausgebildet ist, der eine Einlassöffnung (4) und eine Auslassöffnung (10) hat und in dem mindestens ein Sensorelement (6,7) angeordnet ist, wobei die Einlassöffnung (4) trichterförmig ausgebildet ist und die Aus- lassöffnung (10) in der Hauptströmungsrichtung (12) des Massenstroms im Windschatten der Einlassöffnung (4) ist.1. Mass flow meter, which is suitable for insertion into a main channel (2), in which a mass flow flows in a main flow direction (12), with a housing (1), in which an auxiliary channel is formed, which has an inlet opening (4) and has an outlet opening (10) and in which at least one sensor element (6, 7) is arranged, the inlet opening (4) being funnel-shaped and the outlet opening (10) in the main flow direction (12) of the mass flow in the slipstream of the inlet opening (4) is.
2. Massenstrommesser nach Anspruch 1, dadurch gekennzeichnet, dass der Hilfskanal in dem Bereich, der an die Auslassöff- nung (10) stromaufwärts angrenzt, in etwa senkrecht zur Hauptströmungsrichtung (12) ausgebildet ist.2. Mass flow meter according to claim 1, characterized in that the auxiliary channel is formed approximately perpendicular to the main flow direction (12) in the area which adjoins the outlet opening (10) upstream.
3. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Hilfskanal U-förmig ausgebildet ist.3. The method according to any one of the preceding claims, characterized in that the auxiliary channel is U-shaped.
4. Massenstrommesser nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass ein Bereich der Außenkontur einer Trichterwand (11) in die Auslassöffnung (10) mündet und dass sich dieser Bereich entlang der Hauptströmungsrichtung (12) verjüngt. 4. Mass flow meter according to one of the preceding claims, characterized in that an area of the outer contour of a funnel wall (11) opens into the outlet opening (10) and that this area tapers along the main flow direction (12).
PCT/DE2001/003639 2000-09-21 2001-09-20 Mass flowmeter WO2002025223A1 (en)

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DE2000146943 DE10046943A1 (en) 2000-09-21 2000-09-21 Mass flow meter
DE10046943.4 2000-09-21

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Cited By (3)

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WO2003089884A1 (en) * 2002-04-22 2003-10-30 Siemens Aktiengesellschaft Device for measuring the mass of air flowing inside a line
DE10308880B4 (en) * 2003-02-28 2006-04-06 Siemens Ag Mass flow device
DE10337824B4 (en) * 2003-08-18 2006-04-27 Siemens Ag Mass flow meter

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US5654506A (en) * 1994-06-10 1997-08-05 Hitachi, Ltd. Heat type air flow meter
EP0940657A2 (en) * 1998-03-06 1999-09-08 Denso Corporation Air flow meter

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DE4407209C2 (en) * 1994-03-04 1996-10-17 Bosch Gmbh Robert Device for measuring the mass of a medium flowing in a line
DE19547915A1 (en) * 1995-12-21 1997-06-26 Bosch Gmbh Robert Device for measuring the mass of a flowing medium
JP3527813B2 (en) * 1996-09-02 2004-05-17 株式会社日立製作所 Heating resistor type air flow measurement device

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US5631415A (en) * 1992-09-17 1997-05-20 Hitachi, Ltd. Air flow rate measuring device
US5654506A (en) * 1994-06-10 1997-08-05 Hitachi, Ltd. Heat type air flow meter
EP0735349A1 (en) * 1995-03-28 1996-10-02 Ford Motor Company Mass air flow sensor housing
EP0940657A2 (en) * 1998-03-06 1999-09-08 Denso Corporation Air flow meter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003089884A1 (en) * 2002-04-22 2003-10-30 Siemens Aktiengesellschaft Device for measuring the mass of air flowing inside a line
US6865938B2 (en) 2002-04-22 2005-03-15 Siemens Aktiengesellschaft Device for measuring the mass of air flowing inside a line
DE10308880B4 (en) * 2003-02-28 2006-04-06 Siemens Ag Mass flow device
DE10337824B4 (en) * 2003-08-18 2006-04-27 Siemens Ag Mass flow meter

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