EP2115400A2 - Procédé et dispositif pour mesurer en continu une consommation dynamique d'un fluide - Google Patents

Procédé et dispositif pour mesurer en continu une consommation dynamique d'un fluide

Info

Publication number
EP2115400A2
EP2115400A2 EP08708397A EP08708397A EP2115400A2 EP 2115400 A2 EP2115400 A2 EP 2115400A2 EP 08708397 A EP08708397 A EP 08708397A EP 08708397 A EP08708397 A EP 08708397A EP 2115400 A2 EP2115400 A2 EP 2115400A2
Authority
EP
European Patent Office
Prior art keywords
pressure
flow sensor
difference
flow
fluid
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Withdrawn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
EP08708397A
Other languages
German (de)
English (en)
Inventor
Karl KÖCK
Michael Cernusca
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.)
AVL List GmbH
Original Assignee
AVL List 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 AVL List GmbH filed Critical AVL List GmbH
Publication of EP2115400A2 publication Critical patent/EP2115400A2/fr
Withdrawn legal-status Critical Current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
    • G01F1/05—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 mechanical effects
    • G01F1/34—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 mechanical effects by measuring pressure or differential pressure
    • 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
    • G01F1/05—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 mechanical effects
    • G01F1/34—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 mechanical effects by measuring pressure or differential pressure
    • G01F1/50—Correcting or compensating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
    • G01F9/008—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine where the other variable is the flight or running time
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
    • G01F9/02—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine wherein the other variable is the speed of a vehicle
    • G01F9/023—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine wherein the other variable is the speed of a vehicle with electric, electro-mechanic or electronic means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow

Definitions

  • the invention relates to a method for continuously measuring a dynamic fluid consumption, in particular fuel consumption, by means of a continuously operating flow sensor with variable pressure drop, preferably a mass flow sensor, wherein the pressure behind the flow sensor determined and used to control the fluid delivery, and a device for continuous measurement of a dynamic fluid consumption, in particular fuel consumption, comprising a tank, possibly a conditioning plant, and preferably a controllable pump, a continuously operating flow sensor for the liquid, preferably a Coriolis sensor, and immediately downstream of the flow sensor, a pressure sensor whose output with at least one control device for the fluid flow, for example a controllable pump is connected.
  • Modern internal combustion engines usually require defined and flow-independent pressure conditions both in the fuel supply line and in the optionally present fuel return line for proper operation. Therefore, an arrangement for flow measurement or an arrangement for calibrating a flow measurement with in each case only one pressure sensor behind or before the flow measurement has already been proposed in the AT 3 350 U2 or the AT 6 117 U2, as well as with a pressure stabilization device for stabilizing the flow pressure of the mass flow sensor in order to generate the required low and constant pressure at the connection point of the consumer. In particular, high-frequency, erratic or pulsatile withdrawals must be taken into account quickly.
  • the object of the present invention was to specify a method and a device which, with the simplest possible structure, permit continuous, accurate and also high-resolution consumption measurement and the highly dynamic determination of the flow value.
  • the method described above according to the invention is characterized in that at least one time and the pressure immediately before the flow sensor, the difference of the two pressure values and from this difference, a value for the flow of the fluid can be determined. This results in a combination of a very accurate long-term flow measurement with a highly dynamic determination of the flow value by the time-high resolution pressure signals, using a pressure measurement which is necessary anyway for the pressure control.
  • An advantageous variant of the method provides that the pressure downstream of the flow sensor, the pressure immediately upstream of the flow sensor, the difference between the two pressure values and from this difference a value for the flow of the fluid are determined continuously with a predefinable time resolution. This allows the resolution of the flow value determined from the pressure measurements to be set.
  • an average fluid consumption is determined by means of the flow sensor, linked to the value for the flow of the fluid from the difference of the pressure values, and a plausibility check is thus carried out for the measurement.
  • the very accurate measurement can also be checked well in terms of measurement plausibility due to the redundant flow determination.
  • a mean fluid consumption is determined by means of the flow sensor, linked to the value for the flow of the fluid from the difference of the pressure values and thus further fluid parameters are determined, there is the possibility of the two different flow measurements for determining further fluid parameters, eg density or viscosity to draw on.
  • the signal of the flow sensor of a low-pass filter and the signal of the difference of the two pressure values are subjected to high-pass filtering, and the filtered signals are subsequently combined to form a signal of a large frequency bandwidth.
  • the device for carrying out the flow measurement is inventively characterized in that a further pressure sensor is provided immediately in front of the flow sensor, wherein both pressure sensors are connected to an evaluation unit, in which at least one time determines the difference between the values determined by the two pressure sensors and from this Difference is a value for the flow of the fluid is determined.
  • pressure sensors with a faster step response than those of the flow sensor are used according to another feature of the invention.
  • the difference of the two pressure values and from this difference a value for the flow of the fluid are determined continuously in the evaluation unit with a predefinable time resolution.
  • an average fluid consumption is determined in the evaluation unit from the signals of the flow sensor, linked to the value for the flow of the fluid from the difference of the pressure values and thus carried out a plausibility check for the measurement.
  • a further extension of the field of application is given for a device according to the invention in which an average fluid consumption is determined in the evaluation unit from the signals of the flow sensor, linked with the value for the flow of the fluid from the difference of the pressure values and thus further fluid parameters are determined.
  • a low-pass filter is implemented in the measuring channel of the flow sensor and a high-pass filter is implemented in the measuring channel of the signal for the difference of the pressure values, a signal being composed of the filtered signals in the evaluation unit.
  • the effective filter characteristics up to an upper limit frequency have a constant value, which value is preferably 1.
  • the drawing figure shows a schematic example of a device according to the invention as a continuous fuel consumption measuring system, in particular for engine test stands.
  • a tank 2 Via a line A and a preferably electromagnetically operable filling valve 1, a tank 2, as a reservoir with the liquid, ie the fuel supplied.
  • the tank 2 further has a vent 3 and a level sensor 4 coupled to the filling valve 1.
  • the fuel is supplied by means of a preferably controllable fuel pump 6 via a line B to the continuously operating flow sensor 7, preferably a Coriolis sensor. Thereafter, the fuel passes via preferably a shut-off valve 8 to the delivery point, at which the engine as a consumer (not shown) is connected and to which the fuel with a certain, predetermined pressure is to be available.
  • a line C branches off, which leads to the control input of, for example, a mechanical-hydraulic pressure regulator 9.
  • the flow is now controlled by a line D, depending on the pressure in the line behind the flow sensor 7, which branches off between the fuel pump 6 and the flow sensor 7 of the line B and returns through the pressure regulator 9 to the fuel tank 2.
  • a control loop with feedback is realized, in which each pressure change is converted behind the flow sensor 7 relative to the settable on the pressure regulator 9 default value in the same direction change of that liquid stream, which diverted through the line C before the flow sensor 7 from the line B and without flow through this Sensor 7 is returned to the tank 2 again.
  • a first pressure sensor 10 for determining the pressure in the line B is provided between the pump 6 and the flow sensor 7, a first pressure sensor 10 for determining the pressure in the line B is provided.
  • a second pressure sensor 11 is provided behind the flow sensor 7 for determining the pressure in the line system.
  • the two pressure sensors 10, 11 preferably have a faster jump response than the flow sensor 7 used. Both pressure sensors 10, 11 are connected to an evaluation unit 12, in which the difference of the values determined by the two pressure sensors 10, 11 is at least one time determined and from this difference, a value for the flow of the fluid is determined.
  • the difference of the two pressure values of the sensors 10, 11 can be determined in the evaluation unit, for example continuously with a predefinable temporal resolution, wherein this difference then further a value for the flow of the fluid can be determined.
  • the determination of an average fluid consumption in the evaluation unit 12 from the signals of the flow sensor 7 and its connection to the flow value from the difference of the pressure values to the plausibility check for the measurement could also be provided.
  • an average fluid consumption is determined in the evaluation unit 12 from the signals of the flow sensor 7, linked to the value for the flow of the fluid from the difference of the pressure values of the sensors 10, 11 and such further fluid parameters are determined, for example the density or viscosity of the fluid.
  • a low-pass filter and in the measuring channel of the signal for the difference of the pressure values of the sensors 10, 11 realized a high-pass filter.
  • the evaluation unit 12 can then be composed of the filtered individual signals, a signal with high bandwidth. It is advantageous if the effective filter characteristics up to an upper limit frequency have a constant value, which value is preferably 1.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Measuring Volume Flow (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

L'invention concerne un procédé pour mesurer en continu une consommation dynamique d'un fluide, en particulier une consommation de carburant, au moyen d'un capteur de débit (7) à chute de pression variable fonctionnant en continu, de préférence un capteur de débit massique, la pression à l'arrière du capteur de débit (7) étant déterminée et utilisée pour réguler l'acheminement du fluide. L'objectif de l'invention est de permettre de mesurer la consommation de façon continue, précise et rapide au moyen d'une structure qui soit la plus simple possible et de déterminer la valeur de débit de façon hautement dynamique. À cet effet, le procédé selon l'invention consiste à déterminer également, à au moins un instant, la pression directement à l'avant du capteur de débit (7), la différence entre les deux valeurs de pression et, à partir de cette différence, une valeur relative au débit du fluide.
EP08708397A 2007-02-05 2008-01-30 Procédé et dispositif pour mesurer en continu une consommation dynamique d'un fluide Withdrawn EP2115400A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0006907U AT9241U3 (de) 2007-02-05 2007-02-05 Verfahren und vorrichtung zur kontinuierlichen messung eines dynamischen fluidverbrauchs
PCT/EP2008/051080 WO2008095836A2 (fr) 2007-02-05 2008-01-30 Procédé et dispositif pour mesurer en continu une consommation dynamique d'un fluide

Publications (1)

Publication Number Publication Date
EP2115400A2 true EP2115400A2 (fr) 2009-11-11

Family

ID=37943730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708397A Withdrawn EP2115400A2 (fr) 2007-02-05 2008-01-30 Procédé et dispositif pour mesurer en continu une consommation dynamique d'un fluide

Country Status (6)

Country Link
US (1) US20100083770A1 (fr)
EP (1) EP2115400A2 (fr)
JP (1) JP2010518368A (fr)
CN (1) CN101652637A (fr)
AT (1) AT9241U3 (fr)
WO (1) WO2008095836A2 (fr)

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DE102011100029C5 (de) * 2011-04-29 2016-10-13 Horiba Europe Gmbh Vorrichtung zum Messen eines Kraftstoffflusses und Kalibriervorrichtung dafür
US9242564B2 (en) 2011-07-11 2016-01-26 Magna Powertrain Ag & Co Kg Converter for an electrical machine, controller and method for operating a converter
EP2696175B1 (fr) * 2012-08-07 2021-09-15 Grundfos Holding A/S Procédé de détection du débit d'une pompe à centrifuge
DE102012215024A1 (de) * 2012-08-23 2014-02-27 Robert Bosch Gmbh Verfahren zur Überwachung eines Drucksensors in einem Förder- und Dosiersystem für ein Reaktionsmittel eines Katalysators
AT512724B1 (de) * 2013-07-12 2015-02-15 Avl List Gmbh Vorrichtung und Verfahren zur kontinuierlichen Messung des dynamischen Kraftstoffverbrauchs einer Brennkraftmaschine
AT513535B1 (de) * 2014-02-06 2015-09-15 Avl List Gmbh Verfahren zur Funktionsprüfung einer Anordnung zur dynamischen Kraftstoffverbrauchsmessung
JP6404639B2 (ja) * 2014-08-22 2018-10-10 株式会社堀場製作所 燃料流量測定装置
DE102017112885A1 (de) 2016-06-29 2017-07-27 FEV Europe GmbH Verfahren zum Betreiben eines Hydrospeichers, Hydrospeicher und Kraftstoffversorgungssystem für eine Verbrennungskraftmaschine
DE102016226003A1 (de) * 2016-12-22 2018-06-28 Robert Bosch Gmbh Verfahren und Vorrichtung zur Korrektur eines Luftmassenstromsensors
US10859592B2 (en) * 2017-01-31 2020-12-08 Tecan Trading Ag Method of aspirating by pipetting and pipetting apparatus
CN108801404B (zh) * 2018-06-14 2020-06-26 中国三峡建设管理有限公司 灌浆单元流量计率定装置及方法

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US6311136B1 (en) * 1997-11-26 2001-10-30 Invensys Systems, Inc. Digital flowmeter
DE59904728D1 (de) * 1998-12-11 2003-04-30 Flowtec Ag Coriolis-massedurchfluss-/dichtemesser
ATE344919T1 (de) 1999-10-06 2006-11-15 Avl List Gmbh Vorrichtung zur kontinuierlichen messung des dynamischen kraftstoffverbrauchs eines verbrauchers
GB0212739D0 (en) * 2002-05-31 2002-07-10 Univ Sussex Improvements in or relating to the measurement of two-phase fluid flow
WO2004010234A2 (fr) * 2002-07-19 2004-01-29 Celerity Group, Inc. Procede et appareil de compensation de pression dans un controleur de debit massique
AT6117U3 (de) * 2002-12-18 2003-09-25 Avl List Gmbh Verfahren und vorrichtung zur kontinuierlichen messung eines dynamischen flüssigkeitsverbrauchs
DE10335665B4 (de) * 2003-08-04 2005-10-27 Siemens Ag Massendurchflussmessgerät
DE102005046319A1 (de) * 2005-09-27 2007-03-29 Endress + Hauser Flowtec Ag Verfahren zum Messen eines in einer Rohrleitung strömenden Mediums sowie Meßsystem dafür

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Also Published As

Publication number Publication date
WO2008095836A2 (fr) 2008-08-14
AT9241U3 (de) 2007-12-15
WO2008095836A3 (fr) 2008-10-16
CN101652637A (zh) 2010-02-17
US20100083770A1 (en) 2010-04-08
AT9241U2 (de) 2007-06-15
JP2010518368A (ja) 2010-05-27

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