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WO2008000577A1 - Procédé et dispositif de mesure d'un flux d'air massique par ultrasons - Google Patents

Procédé et dispositif de mesure d'un flux d'air massique par ultrasons Download PDF

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Publication number
WO2008000577A1
WO2008000577A1 PCT/EP2007/055317 EP2007055317W WO2008000577A1 WO 2008000577 A1 WO2008000577 A1 WO 2008000577A1 EP 2007055317 W EP2007055317 W EP 2007055317W WO 2008000577 A1 WO2008000577 A1 WO 2008000577A1
Authority
WO
WIPO (PCT)
Prior art keywords
ultrasonic wave
actual
mass flow
impact position
transducer array
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.)
Ceased
Application number
PCT/EP2007/055317
Other languages
German (de)
English (en)
Inventor
Rudolf Bierl
Martin Lesser
Andreas Meyer
Frank Steuber
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.)
Siemens AG
Continental Automotive GmbH
Siemens Corp
Original Assignee
Siemens AG
Continental Automotive GmbH
Siemens Corp
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 AG, Continental Automotive GmbH, Siemens Corp filed Critical Siemens AG
Priority to DE112007001322T priority Critical patent/DE112007001322A5/de
Publication of WO2008000577A1 publication Critical patent/WO2008000577A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/665—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters of the drag-type

Definitions

  • the present invention relates to a method and a device for measuring the mass flow of an air flow in a tube by means of ultrasound, in particular in an intake manifold of an internal combustion engine.
  • the present invention has for its object to provide a method and apparatus for measuring the mass flow of air flow in a tube by means of ultrasound, which require the smallest possible measurement and evaluation effort.
  • a directed ultrasonic wave of a Side of the pipe wall at an angle emitted obliquely to the flow direction.
  • a reflector disposed on the opposite side of the tube wall reflects the directional ultrasonic wave to an actual landing position of a receiver transducer array disposed on the same side of the tube wall as the transmitter transducer array. Due to the drifting effect caused by the air flow, deviations occur between the actual impact positions and a desired impact position of the reflected ultra-sound wave, which is utilized to determine the mass flow.
  • the radiation angle of the directional ultrasonic wave is controlled in dependence on these deviations so that the actual impact position is kept as close as possible to the desired impact position.
  • the mass flow can then be determined from the manipulated variable required for holding the actual impact position for the regulation of the emission angle.
  • the method and the device according to the invention have the advantage that the transit time measurement required in the prior art and its complicated evaluation are avoided. Rather, the evaluation of a voltage distribution at the receiver transducer array is essentially merely necessary in the invention. Since the determination of the manipulated variable for readjustment of the emission angle and the determination of the mass flow can be carried out via characteristic maps, a high speed of the method according to the invention is ensured.
  • Figure 1 is a schematic of an apparatus for measuring an air mass flow in a tube by means of ultrasound and
  • Figure 2 is a schematic diagram of the measuring device of Figure 1 with further details in an enlarged scale.
  • FIG. 1 schematically shows a pipe wall 4 of a pipe 2 through which air flows with the schematically indicated speed distribution v s , x .
  • the pipe 2 is, in particular, the intake pipe of an internal combustion engine (not shown).
  • the device shown schematically in Figure 1 is used to measure the mass flow (the mass flow rate) of the air flow by means of ultrasound.
  • the device consists of a transmitter-transducer array S, a reflector R, a receiver-transducer array E and an evaluation device 6, which has a regulator circuit with a regulator 8 and an evaluation circuit 10.
  • the transmitter converter array S and the receiver converter array E are arranged on the same side of the tube wall 4, while the reflector R is located on the opposite side
  • the transmitter-transducer array S radiates a directional ultrasonic wave US slants toward the flow direction at a radiation angle ⁇ in the direction of the reflector R.
  • the x-component v u , x of the velocity v u of the ultrasonic wave US and the X-component v s , x of the flow velocity v s of the air flow overlap, which leads to a "drifting" of the ultrasonic wave US
  • the drift effect is the stronger The larger the flow velocity v ⁇ of the air flow, the impact point of the ultrasonic wave US at the reflector R and the point of impact of the reflected ultrasonic wave US 'am change depending on the size of the drift effect This is exploited according to the present invention to determine the mass flow, as will be explained in more detail below.
  • the transducer arrays S and E each consist of a group of individual ultrasound transducers Si... S n or Ei... E n , which are arranged next to one another in the direction of flow.
  • the transmitter-converter array S is supplied with voltage by a high voltage source 12.
  • Converter arrays S are associated with delay elements 14, which are fed by an AC voltage source 16 with AC voltages ACi ... AC n .
  • This offers the possibility of the individual ultrasonic transducers Si ... S n with different delay times ti ... t n to be controlled with a time delay, that the time-offset emitted individual ultrasonic waves USi ... US n is given a directional characteristic, whereby the directed ultrasonic wave US formed becomes.
  • the reflector R (FIG. 1), which reflects the directional ultrasonic wave US, is designed to focus the reflected ultrasonic wave US 'in order to concentrate the energy of the ultrasonic wave incident on the receiver transducer array E to the smallest possible area. Since focussing ultrasonic reflectors are known in the prior art, this will not be discussed in more detail.
  • the reflected ultrasonic wave US ' has a bell-shaped energy distribution G.
  • the maximum of the bell-shaped energy distribution G is as actual impact position A of the reflected ultrasonic wave US' is defined.
  • the control circuit of the evaluation device 6 has the task of the actual impact point A is to maintain n at a target landing position A so on.
  • the evaluation device 6 regulates the emission angle ⁇ of the directed ultrasonic wave US so that the reflected ultrasonic wave US 'is adapted to a desired ultrasonic wave US' so ii whose energy distribution G is indicated by dashed lines.
  • Converter arrays E an evaluation member 20 supplied, which evaluates the position of the maximum of the energy distribution G and thus the actual impact position A is determined.
  • the actual impact position A is the representative signal is supplied via a line 22 to a comparator 26 which is a, the target landing position A so ii receives a signal representing a line 24th
  • the comparator 26 determines the deviation between A is t and A 3O i I and outputs a corresponding signal to the controller 8 from. From this deviation, the controller 8 uses a control algorithm to determine a manipulated variable 32 in the form of delay times ti... T n , with which the delay elements 14 must drive the individual ultrasonic transducers Si... S n in order to control the emission angle ⁇ directed ultrasonic wave US to influence so that the actual impact point A 13t of the reflected ultrasonic wave US 'as close to the target impact position A 30I i is maintained.
  • the control algorithm of the controller 8 uses schematically indicated maps 30 which, depending on the actual impact position A 13t on the receiver transducer array E, contain the corresponding delay times for the control of the individual ultrasonic transducers.
  • the maps 30 are determined by means of test series for different pipe diameters in the calibration of the measuring device.
  • a memory 34 is arranged with the output of the controller 8, in which the output from the controller 8 manipulated variable 32 (delay times) can be stored. An appropriate memory is not essential.
  • the manipulated variable 32, d. H. the delay times of the delay elements 14 required for influencing the emission angle ⁇ are also supplied to the evaluation circuit 10, which determines the mass flow on the basis of schematically indicated characteristic diagrams 38.
  • the maps 38 are set in series of tests for different pipe diameters in the calibration of the measuring device.
  • evaluation device 6 can be part of a central electronic operating control device (not shown).
  • the method and the device according to the invention have the advantage that the travel time measurement required in the prior art and the associated complicated evaluation are eliminated. Rather, only a voltage distribution at the receiver transducer array needs to be evaluated in the manner described. Since the impact position A is the reflected ultrasonic wave US 'is constantly readjusted on Empfanger- transducer array E, there will only be small changes in the actual impact position A is what the initial evaluation in accordance with simplified.
  • the mass flow is obtained directly from the manipulated variable 32, ie the different delay times for the control of the transmitter-converter array. Since the determination of the manipulated variable 32 as well as the determination of the mass flow via maps 30 and 38, a high speed of the entire measurement process is ensured.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif de mesure du flux d'air massique dans un tube. Selon ledit procédé, un réseau d'émetteur/convertisseur (S) émet une onde ultrasonore dirigée (US) à partir d'un côté du tube (4), de façon oblique par rapport à la direction d'écoulement (x). Un réflecteur (R) situé sur le côté opposé réfléchit l'onde ultrasonore dirigée vers un réseau de récepteur/convertisseur (E). Le flux massique est ensuite déterminé en fonction d'écarts entre la position d'incidence réelle (Aist) et une position d'incidence de consigne (Asoll) de l'onde ultrasonore réfléchie (US').
PCT/EP2007/055317 2006-06-26 2007-05-31 Procédé et dispositif de mesure d'un flux d'air massique par ultrasons Ceased WO2008000577A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112007001322T DE112007001322A5 (de) 2006-06-26 2007-05-31 Verfahren und Vorrichtung zum Messen eines Luftmassenstroms mittels Ultraschall

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006029199.9 2006-06-26
DE200610029199 DE102006029199B3 (de) 2006-06-26 2006-06-26 Verfahren und Vorrichtung zum Messen eines Luftmassenstroms mittels Ultraschall

Publications (1)

Publication Number Publication Date
WO2008000577A1 true WO2008000577A1 (fr) 2008-01-03

Family

ID=38346295

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/055317 Ceased WO2008000577A1 (fr) 2006-06-26 2007-05-31 Procédé et dispositif de mesure d'un flux d'air massique par ultrasons

Country Status (2)

Country Link
DE (2) DE102006029199B3 (fr)
WO (1) WO2008000577A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2154491A1 (fr) * 2008-08-07 2010-02-17 UAB Minatech Débitmètre à ultrasons, ensemble de transducteur et procédé
JP2014507667A (ja) * 2011-03-07 2014-03-27 フレクシム フレクシブレ インドゥストリーメステヒニーク ゲーエムベーハー 超音波クランプオン式流量測定のための方法及び該方法を実行するための装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008029772A1 (de) 2008-06-25 2009-12-31 Endress + Hauser Flowtec Ag Verfahren und Messsystem zur Bestimmung und/oder Überwachung des Durchflusses eines Messmediums durch ein Messrohr
DE102008058376A1 (de) * 2008-11-20 2010-06-02 Nivus Gmbh Verfahren und Vorrichtung zur Fluidströmungsmessung
DE102021118821A1 (de) * 2021-07-21 2023-01-26 Krohne Messtechnik Gmbh Ultraschalldurchflussmessgerät und Verfahren zum Betreiben eines Ultraschalldurchflussmessgeräts

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5952583A (en) * 1998-06-10 1999-09-14 Chang Min Tech Co., Ltd. Method of measuring a river horizontal average flow velocity
WO2005064283A2 (fr) * 2003-12-29 2005-07-14 Robert Bosch Gmbh Debitmetre a ultrasons dote d'elements d'emission et de reception entrecroises
WO2005090929A1 (fr) * 2004-03-18 2005-09-29 Robert Bosch Gmbh Detecteur de flux par ultrasons comportant un ensemble transducteur et une surface de reflexion

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4726235A (en) * 1986-03-12 1988-02-23 Available Energy, Inc. Ultrasonic instrument to measure the gas velocity and/or the solids loading in a flowing gas stream
DE4416826A1 (de) * 1994-05-16 1995-11-23 Steffen Dipl Ing Schulze Neuartiges Ultraschallsystem zur Bestimmung der Strömungsgeschwindigkeit in Gasen und Flüssigkeiten
DE10344895A1 (de) * 2003-09-26 2005-04-21 Bosch Gmbh Robert Ultraschallströmungssensor mit Wandlerarray

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5952583A (en) * 1998-06-10 1999-09-14 Chang Min Tech Co., Ltd. Method of measuring a river horizontal average flow velocity
WO2005064283A2 (fr) * 2003-12-29 2005-07-14 Robert Bosch Gmbh Debitmetre a ultrasons dote d'elements d'emission et de reception entrecroises
WO2005090929A1 (fr) * 2004-03-18 2005-09-29 Robert Bosch Gmbh Detecteur de flux par ultrasons comportant un ensemble transducteur et une surface de reflexion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2154491A1 (fr) * 2008-08-07 2010-02-17 UAB Minatech Débitmètre à ultrasons, ensemble de transducteur et procédé
JP2014507667A (ja) * 2011-03-07 2014-03-27 フレクシム フレクシブレ インドゥストリーメステヒニーク ゲーエムベーハー 超音波クランプオン式流量測定のための方法及び該方法を実行するための装置

Also Published As

Publication number Publication date
DE112007001322A5 (de) 2009-04-30
DE102006029199B3 (de) 2008-01-24

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