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WO2011044891A1 - Dispositif et procédé de mesure du niveau de remplissage dans des récipients de forme quelconque, notamment à l'intérieur de réservoirs de véhicule à moteur - Google Patents

Dispositif et procédé de mesure du niveau de remplissage dans des récipients de forme quelconque, notamment à l'intérieur de réservoirs de véhicule à moteur Download PDF

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Publication number
WO2011044891A1
WO2011044891A1 PCT/DE2010/001229 DE2010001229W WO2011044891A1 WO 2011044891 A1 WO2011044891 A1 WO 2011044891A1 DE 2010001229 W DE2010001229 W DE 2010001229W WO 2011044891 A1 WO2011044891 A1 WO 2011044891A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
liquid
pressure
determined
evaluation unit
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/DE2010/001229
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German (de)
English (en)
Inventor
Sascha Berger
Lutz Berger
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.)
Digades - Digitales und Analoges Schaltungsdesign GmbH
Original Assignee
Digades - Digitales und Analoges Schaltungsdesign 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 Digades - Digitales und Analoges Schaltungsdesign GmbH filed Critical Digades - Digitales und Analoges Schaltungsdesign GmbH
Priority to EP10779215A priority Critical patent/EP2488836A1/fr
Publication of WO2011044891A1 publication Critical patent/WO2011044891A1/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
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
    • G01F23/18—Indicating, recording or alarm devices actuated electrically
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/80—Arrangements for signal processing

Definitions

  • the present invention relates to a device for determining the level of liquids in a container (in particular in a motor vehicle tank), to a corresponding determination method for the filling level and to motor vehicles having a corresponding device.
  • Fuel in motor vehicle tanks are already known from the prior art. Usually, such devices are based on the principle that
  • an electric potentiometer controls depending on the level in the fuel tank via a lever arm.
  • the electrical properties of the potentiometer for example, the ohmic resistance between two Potentiometer connections
  • the change of the potentiometer thus allows a statement about the
  • an object of the present invention to provide a device for level determination in containers, especially in mobile containers such as motor vehicle tanks, with the simplest, most cost-effective and reliable way the most accurate determination of the current Level of the container is possible.
  • the object of the invention is moreover to provide a corresponding determination method and motor vehicles comprising a corresponding device.
  • the present invention provides a device for determining the level of a liquid in a container (hereinafter alternatively referred to as a measuring arrangement) and a corresponding determination method (hereinafter also referred to as measuring method) with which an exact determination of the liquid content of an arbitrarily shaped Container or tanks is possible.
  • the container or the tank can be designed so that in it the ambient air pressure prevails;
  • the invention can also be realized in containers, within which (due to a gas-tight seal against the environment) the pressure above a liquid in the container is determined by the vapor pressure or gas pressure within this closed system.
  • the additional pressure acting in addition to the hydrostatic pressure of a liquid column ie either the air pressure or the vapor pressure or gas pressure
  • ambient pressure in the context of the present invention.
  • the device comprises the container which can be filled with a liquid and also a first and a second pressure sensor for detecting the pressure.
  • the first pressure sensor is arranged so that a first measured variable (hereinafter also referred to as p S ens) can be detected with it:
  • This first measured variable characterizes a total pressure acting within the container, which results from the hydrostatic pressure of a pressure sensor acting on the first pressure sensor . acting on it via 'sstechniksmenge (ie an amount of liquid within the container) and an amount of liquid in addition to this load-ambient pressure (ie, the air pressure or gas pressure) is obtained.
  • the first pressure sensor for this purpose at the bottom of the container, ie within the container, arranged.
  • the device furthermore has a second pressure sensor with which a second measured variable characterizing a said ambient pressure (ie the gas pressure or the air pressure) can be detected.
  • This second measured variable is subsequently also referred to as umg (or in the case of a container in which the atmospheric pressure or air pressure as ambient pressure prevails, also referred to as Patmo).
  • the device has an evaluation unit (for example a microcontroller) which is in communication with the two pressure sensors for data transmission. If necessary (e.g., if a configuration of the pressure sensors is necessary), this may be a bidirectional data connection. In any case, however, it is necessary that the two measured variables detected by the pressure sensors can be transmitted to the evaluation unit.
  • a third measured variable (which is also referred to below as Pdiff) can be determined or calculated from the two measured variables detected by the pressure sensors.
  • This third measured variable (which is advantageously a differential pressure derived from the measured variables of the two pressure sensors) characterizes the hydrostatic pressure (exerted on the first pressure sensor alone), that is to say without the influence of the ambient pressure.
  • the essential point of the present invention is that one or more functional relationships are determined beforehand, ie before the acquisition of specific measured values for the first and second measured variables by means of the sensors, to which the evaluation unit determines
  • a functional relationship F (p diff ) is a generally specific, fluid type-specific and temperature-specific relationship between the third measured variable p diff and a level of the liquid in the receptacle characterizing Level characteristic value F.
  • the level characteristic value F is generally the volume V filled with liquid in the container, but it is also conceivable as the level characteristic value F to be the height h of the container
  • Liquid level above a defined point at the bottom of the container to use Liquid level above a defined point at the bottom of the container to use.
  • the fill level characteristic value F belonging to this instantaneous fill level is displayed.
  • the device according to the invention may comprise a unit for determining the density of a liquid filled in the container.
  • such a unit can be a plurality of individual density sensors arranged one above the other in the liquid-filled volume of the tank, from whose different measured values (with known vertical distance of the individual sensors) the density of the liquid can be determined.
  • the corresponding principle is known to the person skilled in the art.
  • the correct relationship Fg ( d i ff ) can thus be used to calculate the current fill level.
  • a capacitive sensor and a pressure sensor eg the first pressure sensor
  • the density can then be measured by means of the pressure sensor if the height of the liquid column above the pressure sensor is assumed to be known.
  • the capacitive sensor is arranged at a defined, known location within the container.
  • the instantaneous local filling level within the container is determined with this sensor for this known location. If the position of the first pressure sensor within the container, ie the positioning of this pressure sensor relative to the capacitive sensor is known (so that the instantaneous height of the liquid column above the pressure sensor can be derived from the fill level value of the capacitive sensor), its density can be measured with its measured pressure value the filled liquid, eg. B. to distinguish whether gasoline or diesel is in the container can be determined.
  • liquids can be used in the container in each case for a plurality of different temperatures T temperature-specific functional relationships F T (pdi f f) between the third measured variable and the level (the respective type of liquid) in the container at the respective temperature characterizing
  • the device according to the invention can have a temperature sensor which is arranged (eg inside the container) so that the temperature of a liquid currently filled in the container can be detected with it.
  • the measured values of the temperature sensor can then be transmitted to the evaluation unit which, on the basis of the detected temperature, selects the temperature-specific functional relationship F T (p dü f) for determining the fill level characteristic value of the liquid currently being filled in the tank at this temperature and for the Calculation used.
  • a particularly advantageous variant of the present invention comprises an evaluation unit, which, e.g. with the help of a memory, several different, predetermined and adapted to different conditions functional relationships (characteristics) can process and select from these several characteristics (the curves can be stored in the memory).
  • the currently present level (or level characteristic, this may be in particular to the volume or the filling height at a defined location in the container) are determined.
  • the present invention has the particular advantage that not only a rough estimate or a simple arithmetic Calculation of the parameters that are important in addition to the geometric conditions on the tank for the filling level calculation takes place (as is the case, for example, in the prior art by a simple density calculation from the recorded pressure measured values), but that almost any environmental parameters can be taken into account very accurately.
  • the present invention can provide an evaluation unit with a memory in which a plurality of functional relationships adapted to different conditions between the third measured variable or the hydrostatic pressure on the one hand and the instantaneous fill level F resulting therefrom (depending on the prevailing conditions) V or level h) are stored on the other hand.
  • the container may be designed such that the ambient air pressure is established within the container (no pressure-tight closure of the container relative to the environment).
  • the second pressure sensor is preferably arranged outside the container (for example, attached to the outer shell of the container).
  • the container may also be designed to be pressure-tight with respect to the environment, so that a vapor pressure above the filled-in quantity of liquid forms as ambient pressure within the container.
  • the second pressure sensor is preferably arranged inside the container and in an upper region of the container interior (eg on the inner ceiling side of the container interior).
  • Pressure sensors a wireless transmission unit, with the aid of which the measured variables detected by him wirelessly to a corresponding receiving unit, which is in communication with the evaluation unit or as part of the evaluation unit, can be transmitted.
  • a transmission unit is an RFID transponder; the receiving unit is then designed as an RFID reader.
  • RFID transponders and readers are known in the art.
  • At least the data transmission between the first pressure sensor and the evaluation unit is thus preferably wireless.
  • the fill level characteristic value F characterizing the instantaneous liquid level in the container by means of the relationship F (Pdif f ) from the instantaneous value of p diff to be calculated or derived via the sensors is the instantaneous value in the Container interior filled liquid volume.
  • F (Pdif f ) the fill level characteristic value from the instantaneous value of p diff to be calculated or derived via the sensors
  • Liquid level to define relative to a defined point of the container.
  • the first pressure sensor is preferably arranged in a lower region of the container interior (for example at the lowest point of the bottom of the container).
  • a plurality of first pressure sensors may be provided for detecting first measured quantities p sens .
  • the respective position of the individual first pressure sensors can then be taken into account (sensor-specific characteristic curves).
  • Level characteristic values F are determined.
  • the device according to the invention is integrated in a motor vehicle, for example in a motorcycle; the container is then the vehicle tank of the vehicle.
  • Figure 1 is a sketch of an exemplary inventive structure.
  • FIG. 2 shows an example of measured pressure values during a test drive with a motor vehicle (motorcycle) having a device according to the invention.
  • FIG. 3 shows an example of a predetermined one
  • Characteristic curve for a given liquid normal gasoline
  • a defined temperature (20 ° C) for a given tank geometry.
  • FIG. 4 shows examples of an averaging of the third measured variable P d i ff over a multiplicity of individual measured values for the purpose of reducing measured value distortions due to unevenness in the surface during driving of the motor vehicle and of vibrations of the motor vehicle engine.
  • FIG. 1 shows a tank 1 provided with a tank lid 1a as a container of the device according to the invention. Inside the tank, the first pressure sensor 2 is formed at the lowest point of the bottom of the tank 1. With it, p sen s is the first measurand resulting in a total pressure within the tank 1.
  • This total pressure is composed of a hydrostatic pressure on the first pressure sensor 2 and an additionally acting on the first pressure sensor 2 ambient pressure.
  • the hydrostatic pressure is the pressure that is due to be above the first pressure sensor 2 be finding liquid column with the height h corresponding to the current level in the tank interior on the first pressure sensor 2 loads.
  • the tank 1 is designed here as an open tank, that is in the gas space above the liquid level in the tank interior prevails üm styless Kunststofftik. With the first pressure sensor 2, thus, a measured variable p sen s is detected, which corresponds to the total pressure from the above-described hydrostatic pressure and this ambient air pressure.
  • the hydrostatic pressure alone, ie without the ambient air pressure here correlates (corresponding to the specified specific tank geometry) uniquely with the liquid volume V currently filled in the tank 1.
  • the second pressure sensor 3 is attached to an outer wall thereof, with which the ambient air pressure can be detected.
  • the second pressure sensor 3 has a cable connection 3a, with which it is connected to the evaluation unit 4 for transmitting the second measured variable detected by the second pressure sensor 3 to the evaluation unit 4.
  • the evaluation unit 4 is arranged outside of the tank interior and fixed to the underside of the tank 1.
  • the transmission of the first measured variable p sens from the first pressure sensor 2 to the evaluation unit 4 is based on the known to those skilled RFID technology (from English: radio frequency identification):
  • the first pressure sensor 2 has an RFID transponder 7, which is the first Measured p sen s corresponding measurement data to the formed as part of the evaluation unit 4 RFID reader 8 transmits.
  • Common RFID readers and RFID transponders in known and approved frequency bands (eg at 125 kHz, 869 MHz, 2.4 GHz). It is only necessary to ensure that the positioning between the sensor and the evaluation unit ensures compliance with the relevant approval standards.
  • a temperature sensor 6 is arranged on an inner wall of the container 1 in a lower region of the tank interior 1, which is still liquid- or fuel-tight, even if the fuel quantity in the tank 1 is low. With this, the temperature of the filled liquid or the fuel can be determined.
  • the temperature sensor 6 also has an RFID transponder 6a, by means of which the corresponding temperature values can be transmitted to the evaluation unit 4. On the basis of the instantaneous temperature T, the evaluation unit 4 then selects the suitable characteristic curve F T (p diff ) stored in advance for determining the fill level characteristic value F for the currently present fill volume V.
  • thermosensors for example, all common known temperature-dependent resistors can be used.
  • a unit 5 for determining the density Q of the fuel currently in the tank is arranged at the bottom of the tank interior on a side wall. This unit 5 is also arranged in the lower region of the tank so that density values of the fuel can be determined even with a small tank filling.
  • the unit 5 is provided with an RFID transponder 5 a, with the aid of which the corresponding density values are sent to the evaluation unit 4 or their reader 8 can be transmitted.
  • the unit 5 here consists of two superimposed pressure sensors (not shown), from the measured values at a known distance of these two sensors, the density of the currently filled fuel can be determined.
  • units 5 based on other principles can also be used for density determination.
  • the evaluation unit 4 can thus select the appropriate liquid-specific functional relationship Fe (Pd ff).
  • Suitable pressure sensors are common barometric pressure sensors such as those used for altimeters. In level measurement accuracy can be achieved in the range of a few 10 to 100 milliliters of liquid. To achieve fuel resistance, specially adapted membrane and housing types may be necessary.
  • the determination of the filling level in the tank 1 will be described below by way of example on the basis of averaging of the measured values. Alternatively, however, other evaluation methods can also be implemented in the evaluation unit 4.
  • the first pressure sensor 2 located at the bottom of the tank 1 constantly records the first measured variable p sens at regular time intervals of, for example, 0.5 seconds, which characterizes the above-described total pressure. In the following, this parameter is also referred to simply as "pressure pse ns" for the purpose of abbreviation, although the correct absolute total pressure may only result from this measured variable after a measured value correction.
  • the second pressure sensor 3 outside the tank constantly measures the ambient air pressure at these regular time intervals, thus determining the corresponding measured variable Pum g , which is referred to below as the patmo due to the prevailing atmospheric pressure.
  • This measured variable is also abbreviated to pressure p sen s or p a tmo.
  • the air pressure measurement is necessary because the first pressure sensor 2, the pressure of the pressure above him
  • Liquid column (corresponding to the third measurand Pdiff) only together with the air pressure p a tmo measures.
  • the two sensors 1, 2 are not calibrated equal, that is, they measure different values for the ambient air pressure.
  • Patmo (air) is the value that the second pressure sensor 3 measures and p sens (air) is the value that the first pressure sensor 2 measures when the tank 1 is completely empty (no liquid present): In this case it also measures the first pressure sensor the air pressure.
  • Pdiff Psens - (Patmo (air) - ⁇ ) with p S ens as the total pressure acting on the first pressure sensor 2 and p atmo (air) as the ambient air pressure detected by the second pressure sensor.
  • FIG. 2 shows an example of the measurement of the ambient air pressure by a second pressure sensor 3
  • the microcontroller of the evaluation unit 4 thus includes a suitable arithmetic unit for performing the calculations and a memory.
  • the characteristic determination is realized by filling a defined volume V of the liquid into the tank in the above-described measuring arrangement at sufficiently large time intervals (of, for example, 3 minutes).
  • the pressure of the liquid column Pdiff is as described above. ben determined.
  • Each level or filling volume V can thus be assigned a value P d i ff in a unique manner.
  • Level characteristic value here: filling volume V of liquid in the tank
  • FIG. 3 filling volume in liters, differential pressure in hectopascals.
  • the characteristic can be obtained by means of a predefined mathematical function, for example a polynomial, on the basis of a fitting method from the specific measured value pairs (P d i ff , V). Corresponding fitting methods are known to the person skilled in the art.
  • F is the force
  • A is the area of the sensor
  • Q is the density of the fluid
  • g is the acceleration of gravity
  • h is the height of the fluid column at the location of the fluid first pressure sensor 2 is.
  • P d i ff is thus dependent on the density of the liquid; a characteristic is therefore valid only for a liquid of the same density p_ (and at a defined temperature T).
  • the detected signal may be the average of all measurements from the measuring point t x - 5 minutes to the measuring point t x .
  • each newly acquired measurement is added to the averaging until the five minutes have passed. Then the newest reading can always replace the oldest (moving averaging). From this determined value of d i ff , the tank capacity can be determined as prescribed via the characteristic function.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

La présente invention concerne un dispositif permettant de déterminer le niveau d'un liquide dans un récipient, notamment dans un réservoir de véhicule à moteur, comprenant le récipient (1) qui peut être rempli avec le liquide, un capteur de pression (2) avec lequel une première grandeur de mesure psens peut être captée, laquelle caractérise la pression totale résultant de la pression hydrostatique d'une quantité de liquide à l'intérieur du récipient pesant sur le premier capteur de pression et d'une pression ambiante pesant sur la quantité de liquide, un deuxième capteur de pression (3) avec lequel une deuxième grandeur de mesure pumg caractérisant ladite pression ambiante peut être captée, et une unité d'évaluation (4) à laquelle la première et la deuxième grandeur de mesure peuvent être transmises et au moyen de laquelle une troisième grandeur de mesure Pdiff caractérisant seule ladite pression hydrostatique peut être déterminée à partir des deux grandeurs de mesure et au moyen de laquelle la valeur caractéristique de niveau de remplissage F appartenant à la troisième grandeur de mesure Pdiff déterminée peut être déterminée à partir de la troisième grandeur de mesure Pdiff déterminée sur la base d'un rapport F(Pdiff) fonctionnel, préalablement déterminé et de préférence stocké dans l'unité d'évaluation, entre la troisième grandeur de mesure Pdiff et une valeur caractéristique de niveau de remplissage F caractérisant le niveau du liquide dans le récipient.
PCT/DE2010/001229 2009-10-12 2010-10-12 Dispositif et procédé de mesure du niveau de remplissage dans des récipients de forme quelconque, notamment à l'intérieur de réservoirs de véhicule à moteur Ceased WO2011044891A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10779215A EP2488836A1 (fr) 2009-10-12 2010-10-12 Dispositif et procédé de mesure du niveau de remplissage dans des récipients de forme quelconque, notamment à l'intérieur de réservoirs de véhicule à moteur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009049676A DE102009049676A1 (de) 2009-10-12 2009-10-12 Vorrichtung und Verfahren zur Füllstandsmessung in beliebig geformten Behältnissen, insbesondere innerhalb von Kraftfahrzeugtanks
DE102009049676.9 2009-10-12

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WO2011044891A1 true WO2011044891A1 (fr) 2011-04-21

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PCT/DE2010/001229 Ceased WO2011044891A1 (fr) 2009-10-12 2010-10-12 Dispositif et procédé de mesure du niveau de remplissage dans des récipients de forme quelconque, notamment à l'intérieur de réservoirs de véhicule à moteur

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EP (1) EP2488836A1 (fr)
DE (1) DE102009049676A1 (fr)
WO (1) WO2011044891A1 (fr)

Cited By (2)

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CN109764928A (zh) * 2019-03-14 2019-05-17 长沙学院 一种应变式智能溶液深度和密度的测量装置及测量方法
US20240337572A1 (en) * 2021-07-09 2024-10-10 Vega Grieshaber Kg Measuring Method and Measuring Assembly

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DE102012001911A1 (de) 2012-02-02 2013-08-08 Krohne Messtechnik Gmbh Nach dem Radar-Prinzip arbeitendes Füllstandsmesssystem
NL2010374C2 (en) 2013-02-28 2014-09-01 Vehold B V Liquid level gauge device.
DE102013214304A1 (de) 2013-07-22 2015-01-22 Gemü Gebr. Müller Apparatebau Gmbh & Co. Kommanditgesellschaft Membran und Verfahren zu deren Herstellung
CN105277249A (zh) * 2015-11-27 2016-01-27 北方工业大学 一种填有防爆材料的密闭容器中易燃液体体积的测量方法
DE102020134912A1 (de) 2020-04-30 2021-11-04 AST (Advanced Sensor Technologies) International GmbH Sensoranordnung für ein Fluid, Fluidtank und Verwendung der Sensoranordnung

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109764928A (zh) * 2019-03-14 2019-05-17 长沙学院 一种应变式智能溶液深度和密度的测量装置及测量方法
CN109764928B (zh) * 2019-03-14 2023-10-13 长沙学院 一种应变式智能溶液深度和密度的测量装置及测量方法
US20240337572A1 (en) * 2021-07-09 2024-10-10 Vega Grieshaber Kg Measuring Method and Measuring Assembly

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EP2488836A1 (fr) 2012-08-22
DE102009049676A1 (de) 2011-04-14

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