EP4143515A1 - Réseau de capteurs pour un fluide, réservoir de fluide et utilisation du réseau de capteurs - Google Patents

Réseau de capteurs pour un fluide, réservoir de fluide et utilisation du réseau de capteurs

Info

Publication number
EP4143515A1
EP4143515A1 EP21722154.8A EP21722154A EP4143515A1 EP 4143515 A1 EP4143515 A1 EP 4143515A1 EP 21722154 A EP21722154 A EP 21722154A EP 4143515 A1 EP4143515 A1 EP 4143515A1
Authority
EP
European Patent Office
Prior art keywords
fluid
sensor
sensor arrangement
designed
conductor
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.)
Pending
Application number
EP21722154.8A
Other languages
German (de)
English (en)
Inventor
Johannes PROSTEDER
Jan Heuser
Stefan Dilger
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.)
AST Advanced Sensor Technologies International Asset GmbH
Original Assignee
AST Advanced Sensor Technologies International Asset 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
Priority claimed from DE102020131192.3A external-priority patent/DE102020131192A1/de
Application filed by AST Advanced Sensor Technologies International Asset GmbH filed Critical AST Advanced Sensor Technologies International Asset GmbH
Publication of EP4143515A1 publication Critical patent/EP4143515A1/fr
Pending 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
    • G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
    • G01F23/162—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid by a liquid column
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity

Definitions

  • the present invention relates to a sensor arrangement for determining a thermal conductivity of a fluid mixture formed from a plurality of fluids, which is in particular a washing liquid or an aqueous fuel solution for exhaust gas aftertreatment for a vehicle, as well as a fluid tank.
  • Vehicles are known from the prior art which have a fluid tank in the form of a washer fluid tank for a windshield cleaning system. It is also known that a sensor is provided for such a washer fluid tank, by means of which it is possible to determine whether the filling level falls below a certain level.
  • the invention is based on the object of creating a sensor arrangement and a fluid tank which eliminate the stated disadvantages in a cost-effective manner.
  • an advantageous use of a sensor arrangement is to be provided.
  • the object with regard to the sensor arrangement is achieved according to the features of claim 1, with regard to the fluid tank according to the features of claim 9 and with regard to the use according to the features of claim 10.
  • a sensor arrangement for a fluid in particular a liquid
  • the sensor arrangement has one, in particular a first, sensor for the liquid. This is designed in such a way that a composition of the liquid and / or a thermal conductivity of the liquid can be determined from the measurement data of the sensor. If the thermal conductivity of the liquid is determined, then, for example, the composition of the liquid can be derived from this data.
  • a, in particular a second, sensor for the liquid is provided, which can be designed such that a fill level of the liquid, in particular in a tank, can be determined from the measurement data of the sensor.
  • a sensor that detects thermal conductivity can be manufactured extremely inexpensively. If the sensor arrangement is used, for example, in a washer fluid tank, the composition of the liquid and the fill level can be determined cost-effectively.
  • the sensor arrangement is designed as a module.
  • the module can be retrofitted, for example.
  • a vehicle has been lowered, it can simply be introduced into a tank, in particular into a washer fluid tank.
  • the module is preferably self-sufficient, that is to say, for example, that it has no cable connections, in particular to an external energy source.
  • the configuration as a module means that it can be completely introduced into the liquid tank, for example through a filling opening of the latter.
  • rental car companies arrange the module in the washer fluid tanks of their vehicles. In this way, companies can collect helpful data in a cost-effective manner. For example, you can tell if a Tenant has filled the washer fluid tank and / or what liquid the washer fluid tank was filled with.
  • a control device is preferably provided in the sensor arrangement. This can record the measurement data of the sensor (s).
  • the control device can have at least one means for wirelessly outputting and / or receiving data.
  • the control device is designed such that it can exchange data with an external device, such as a smartphone. It is therefore conceivable to read out data from the sensor arrangement using a smartphone.
  • a fill level and / or a liquid composition of the washer fluid tank can then preferably be displayed via an application on the smartphone.
  • Bluetooth for example, can be provided as the means.
  • the control device is then designed, for example, as a Bluetooth processor module. This can have a bluetooth antenna.
  • a data transmission device in particular a data transmitting and receiving device, which is designed as a floating body or is arranged in the floating body.
  • the data transmission takes place in particular between the data transmission device and an external device, such as a smartphone.
  • the float can be designed in such a way that it can float in and / or on the liquid, for example the washer fluid tank.
  • the data transmission device is preferably a Bluetooth device or a Bluetooth processor module for data transmission or an antenna for the module or the device.
  • the data transmission device of the floating body can be connected to the sensor arrangement via a cable connection. This is advantageous since the data transmission device can be mechanically and electrically connected to the sensor arrangement via the cable connection.
  • the cable connection is preferably pliable, so that the floating body and the rest of the sensor arrangement can be flexibly arranged with respect to one another.
  • the float with the data transmission device can float on the liquid, the level of which can change, and the rest of the sensor arrangement can freely move in the Washer fluid tank can be arranged.
  • a constant signal or Bluetooth signal can be transmitted through the float, regardless of the liquid level.
  • a length of a cable of the cable connection is preferably chosen such that the floating body can swim freely regardless of the arrangement of the sensor arrangement in the fluid tank.
  • the control device can preferably determine a composition of the fluid and a fill level of the fluid from the measurement data of the sensor / sensors.
  • the sensor arrangement has an energy source, in particular its own, for supplying the sensor arrangement with energy.
  • an energy source in particular its own, for supplying the sensor arrangement with energy.
  • at least one battery preferably two batteries, is extremely cost-effective.
  • a button cell in particular for soldering, in particular a CR1620 (140 mAh), can be provided as the battery.
  • the energy source is preferably designed in such a way that it is sufficient for the duration of use of the sensor arrangement in a car rental company and / or for, for example, 6 to 24 months.
  • vehicles are outsourced after a certain mileage or a certain period of use.
  • the sensor arrangement can then simply remain in the tank.
  • the energy source can be charged, for example via induction. It would also be conceivable to use an energy harvesting module as an energy source.
  • the first sensor and / or the second sensor is / are preferably in contact with the fluid.
  • the module can have a module housing in which a printed circuit board with the first and / or the second sensor is arranged. At least some of the components or all of the components of the sensor arrangement can be arranged on the circuit board.
  • the sensor or sensors at least cantilever in sections from the module housing so that it can be brought into contact with the fluid.
  • the module housing is, for example, tubular or socket-shaped or sleeve-shaped. It can also be cuboid. It preferably has two end faces which are designed to be open in the non-assembled state.
  • the tubular module housing can also have two flat large sides which can extend parallel to one another. Between these two flat small sides can be provided, which can extend parallel to one another.
  • the module housing has, for example, dimensions of: length between 35 and 45 mm, in particular approximately 40 mm; Width between 3 and 13 mm, in particular about 8 mm; Height between 13 and 23 mm, in particular about 18 mm.
  • the circuit board and / or the components of the sensor arrangement are preferably arranged in the module housing.
  • this is, for example, potted, in particular with a resin or epoxy potting.
  • the sensor would protrude from the module housing if required.
  • the first sensor protrudes from the first end face, for example, and the second sensor protrudes from the second end face, for example. If a cable connection with the floating body is provided, this can be mechanically and electrically connected to the circuit board and / or an electronic component and be guided out of the module housing in a sealing manner.
  • the sensor arrangement preferably has: an electrical conductor arrangement which is designed such that it can be brought into contact with the fluid (fluid mixture) and a first conductor and either a second conductor or a fixed resistor or an element in one Has series connection.
  • the first conductor and the element preferably have the same resistance value in a currentless state. In a live state, the first conductor can heat up more than the element.
  • the first conductor can have a resistance value that is different from that of the fixed resistor, at least in a current-carrying state.
  • the sensor further preferably has: a measuring bridge with two voltage dividers connected in parallel.
  • One of the voltage dividers is formed, for example, by connecting the first conductor and the element in series.
  • the other of the voltage dividers can be formed by two adjustable resistors.
  • the sensor can have a control unit for applying an alternating voltage to the measuring bridge, a voltage detection unit for detecting a bridge voltage and an evaluation unit. This is configured, for example, in such a way that, when the fixed resistor is used, it sets the two adjustable resistors before the AC voltage is applied in such a way that the measuring bridge is balanced and that it determines the thermal conductivity of the fluid by evaluating the bridge voltage, in particular using the 3-omega Method, determined. It would be conceivable that the evaluation unit is provided in an external device, such as the smartphone.
  • the sensor in particular the second sensor, is preferably designed in such a way that it measures the pressure, in particular the absolute pressure, of the fluid.
  • the fill level can then be determined from this. If the absolute pressure is measured, it is advantageous if the ambient pressure is taken into account when determining the fill level.
  • the ambient pressure is provided, for example, via an external means. It would be conceivable to use a pressure sensor on the smartphone.
  • the sensor or pressure sensor is preferably designed in such a way that it is compatible with the liquid, for example an ethanol-water mixture. It can be attached to the circuit board.
  • The, in particular the first, conductor of the, in particular the first, sensor is designed, for example, as a wire.
  • This can be attached at both of its end sections to the circuit board, for example to pins.
  • the wire then extends, for example, out of the housing and in particular encompasses it, such as a lasso or a loop. It would also be conceivable to lead the wire out of the housing and to fasten it on the outside of the housing so that it is in fluid contact with the liquid.
  • the wire can be led out of the front of the module housing. It can extend in the longitudinal direction of the module housing.
  • an elastic element can be provided that pretensions the wire.
  • the element is, for example, a housing cover.
  • the spring is preferably formed in one piece with the cover.
  • the cover can have at least one projection in order to protect the end of the wire.
  • the module housing preferably has one or more webs or projections on the outside.
  • the wire can extend along this / these.
  • the web (s) protect the wire from unwanted mechanical contact, for example with the fluid tank or frozen liquid.
  • at least one pair of bars is provided, between which the wire extends.
  • a pair of webs can be formed on a respective large side of the module housing and extend parallel in the longitudinal direction.
  • the conductor can encompass the module housing. It can be stretched over an elastic element.
  • the module housing preferably has at least one housing projection which is designed to protect the first conductor from external mechanical influences.
  • One of the two voltage dividers of the measuring bridge can be formed from the first conductor and a fixed resistor that is used instead of the second conductor.
  • a fixed resistor is to be understood as a resistor which essentially does not change its resistance value even when the current is flowing through it and is therefore to be regarded as essentially constant under any conditions.
  • the two resistors of the other voltage divider are designed in such a way that their resistance value can be set or changed.
  • the two adjustable resistors are preferably designed as digital potentiometers. In the current-carrying state, the first conductor heats up and therefore changes its resistance value, so that the first conductor and the fixed resistor have a different resistance value in the current-carrying state.
  • the resistance value of the first conductor is preferably greater than that of the fixed resistor. However, the resistance value of the first conductor can also be smaller than that of the fixed resistor.
  • the evaluation unit is configured in such a way that it compares the two adjustable resistors before applying an alternating voltage to the measuring bridge.
  • the fluid mixture is formed from two fluids, of which a thermal conductivity is preferably known in each case.
  • the evaluation unit can be configured in such a way that it determines a concentration or a mixing ratio of the fluid mixture by comparing the thermal conductivity of the fluid mixture with the thermal conductivity of the two fluids.
  • a mixing ratio of the fluid mixture can be precisely determined.
  • at least one of the two fluids can also be a fluid mixture, provided that the thermal conductivity thereof is known.
  • the determination of a mixing ratio offers the advantage that the composition of the fluid mixture can be indicated to a user in an easily understandable manner.
  • a freezing point of the two fluids can also be known.
  • the evaluation unit is configured, for example, in such a way that it determines a freezing point using the concentration of the fluid mixture.
  • a freezing point of the fluid mixture can be precisely determined, which allows a user to better judge whether the fluid mixture is suitable for a certain temperature.
  • the fluid mixture is preferably formed from two fluids, of which a thermal conductivity and a freezing point can be known.
  • the evaluation unit can be configured in such a way that it determines a freezing point of the fluid solution by comparing the thermal conductivity with a straight line.
  • the straight line is obtained by a linear interpolation in which the thermal conductivity and the freezing point of the fluids are each used as a support point.
  • the values of the thermal conductivity of the two fluids are in each case on an x-axis of a Cartesian coordinate system and the values of the freezing point of the two fluids are on a y-axis of the Cartesian coordinate system Plotted coordinate system.
  • the determined value of the thermal conductivity of the fluid mixture, which is formed from the two fluids, is then also plotted on the x-axis and the associated value of the freezing point of the thermal conductivity can consequently be determined as the y-axis value of the straight line at this point.
  • This linear interpolation allows the freezing point to be determined in a simple manner and a user can assess precisely whether the fluid mixture is suitable for a specific temperature.
  • a cross-sectional area of the first conductor is preferably smaller than that of the second conductor.
  • the ratio between the cross-sectional areas of the first conductor and the second conductor can be in the range of 3 to 5 and preferably 4.
  • the ratio of the cross-sectional areas of the first conductor and the second conductor can also be in the range from 2 to 6. This design of the first and the second conductor ensures sufficient heating of the first conductor, so that good accuracy of detection of the change in resistance is made possible.
  • the alternating voltage is preferably sinusoidal.
  • the applied alternating voltage can be generated in a simple manner and is suitable for processing in the 3-omega method.
  • the first and / or the second conductor can be designed as wires.
  • a wire is to be understood as a metallic conductor with a round or angular or flat or square or profiled cross section which, if it is not arranged on a substrate, is completely surrounded by the fluid mixture.
  • the conductors, which are designed as wires can be rigidly shaped as a helix or wound or bent in some other way. Experiments have shown that the use of wires as the first and / or second Head a detection accuracy, in particular compared to the design in the form of conductor tracks, is significantly improved. Even when the wires are fixed on a wiring or a substrate such as wiring, detection accuracy is improved.
  • the helix shape also enables a compact design.
  • the conductor designed as wires or the conductor designed as a wire can / can be pretensioned by means of at least one elastic element in order to compensate for a change in length that occurs due to heating in the current-carrying state.
  • the elastic element can preferably be designed as a spring element. In this way, it can be prevented that the conductor, which is designed as a wire, comes into contact with other conductive sections of the device or with itself in the event of a change in length. In this way, a short circuit of the wires can be reliably prevented.
  • a fluid tank of a vehicle is provided. This has an opening for filling the fluid tank with a fluid.
  • the sensor arrangement is designed, for example, in such a way that it can be introduced into the fluid tank via the opening.
  • the senor arrangement is used for a fluid tank of a vehicle.
  • the sensor arrangement can be configured in such a way that, after the vehicle has been manufactured, it can be introduced into the fluid tank via an opening in the latter.
  • the vehicle can be an aircraft or a water-based vehicle or a land-based vehicle.
  • the land-based vehicle can be a motor vehicle or a rail vehicle.
  • the vehicle is particularly preferably a truck or a passenger car or a motorcycle.
  • the vehicle can also be designed as a non-autonomous or partially autonomous or autonomous vehicle.
  • Suitability for use in a vehicle can be suitability for continuous operation at a temperature between -40 ° C to + 120 ° C, such as at 85 ° C.
  • the applicant reserves the right to make an independent claim to a vehicle which has the fluid tank and the sensor arrangement according to one or more of the above-mentioned aspects.
  • FIG. 1 shows the sensor arrangement according to an exemplary embodiment in a perspective illustration
  • FIG. 2 shows the sensor arrangement according to the exemplary embodiment in a further perspective illustration
  • FIG. 3 schematically shows the sensor arrangement according to the exemplary embodiment.
  • a sensor arrangement 1 is designed as a module.
  • the sensor arrangement 1 has a module housing 2 which is designed as a tube.
  • the front side of the module housing 2 is closed by a cover 4.
  • a printed circuit board 6 can be seen within the module housing 2.
  • This has a sensor in the form of a pressure sensor 8. This protrudes from the end face of the module housing 2.
  • the pressure sensor 8 has an opening through which a liquid can be brought into contact with the pressure sensor 8 in order to measure a pressure or absolute pressure of the liquid.
  • the interior of the module housing 2 is potted in order to seal it against the liquid. It would also be conceivable to design the module housing 2 as a sleeve, whereby a cover could be saved.
  • a wire 10 projects out of the module housing 2 from the same end face as the pressure sensor 8, see FIG. 1.
  • the wire 10 is not shown in FIG. 2 for the sake of simplicity shown.
  • the wire 10 extends from the end face, preferably as a loop, around the module housing 2 over the further end face.
  • the wire 10 completely encompasses the module housing 2, starting from the end face. It is supported on the latter via a tongue section 12 of the cover 4, see FIG. 1.
  • the tongue section 12 has a guide, in particular a groove.
  • two pairs of webs 14 and 16 extending in the longitudinal direction are formed on the module housing 2, see FIGS. 1 and 2. These preferably extend parallel to one another and to the longitudinal axis of the module housing 2.
  • a floating body 17 is provided.
  • This has a means for data transmission, such as a Bluetooth transmitting and receiving unit or an antenna or Bluetooth processor module.
  • the unit is mechanically fastened to the printed circuit board 6 by means of a cable 19 and / or non-positively and / or positively.
  • the cable 19 is guided in a sealing manner through the potting compound of the module housing 2. It would also be conceivable to lead the cable 19 through a corresponding opening in the cover 4 or in the module housing 2.
  • the sensor arrangement 1 from FIGS. 1 and 2 configured as a module can, for example, simply be freely introduced or “thrown in” into a wiper water tank 21 or a fluid tank 21, see FIG. 2.
  • the washer fluid tank 21 can be retrofitted inexpensively. If the sensor arrangement 1 is arranged in the washer fluid tank 21, the floating body 17 can swim in the liquid so that, for example, a radio signal, in particular a Bluetooth signal, can be emitted directly into the environment. The radio signal is therefore not emitted via the liquid, which means that it can be emitted independently of the liquid.
  • the washer fluid tank 21 has a fluid supply opening 23 through which a liquid can be refilled.
  • the size and configuration of the sensor arrangement 1 embodied as a module is selected in such a way that it can be introduced via the usual fluid supply opening 23.
  • the washer fluid tank 21 is preferably provided for a vehicle and configured in the usual way.
  • the sensor arrangement 1 has a first sensor 18 which has the wire 10 from FIG. 1.
  • the sensor 18 is designed in such a way that it can be used to determine the thermal conductivity of the fluid in the tank. A second wire would also be conceivable. More detailed information on the configuration of the first sensor 18 can be found in the parallel patent application of the applicant, which is cited above.
  • the sensor arrangement 1 from FIG. 3 also has a Bluetooth processor module 20. This is connected to the sensor 18 via an interface 22 and two PWM interfaces 24 and 26.
  • the pressure sensor 8 is also connected to the Bluetooth processor module 20 via an interface 28 in the form of an I 2 C interface.
  • a hydrostatic pressure 30 is shown schematically according to FIG. 3.
  • the components 18, 20 and 8 are connected to a power management system 32 to which two batteries 34 and 36 are connected.
  • the Bluetooth processor module 20 can, if necessary, be arranged in the floating body 17 from FIG. 2.
  • the module 20 can be connected to the circuit board via the cable 19 and to the interfaces 22, 24 and 26 via the circuit board.
  • the sensor module for a tank that can be retrofitted via a tank opening.
  • the sensor module is designed as a block with its own power source and has means for wireless data exchange.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne un module de capteur pour un réservoir, qui peut être modifié par l'intermédiaire d'une ouverture dans le réservoir.
EP21722154.8A 2020-04-30 2021-04-23 Réseau de capteurs pour un fluide, réservoir de fluide et utilisation du réseau de capteurs Pending EP4143515A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102020111862 2020-04-30
DE102020115467 2020-06-10
DE102020125889 2020-10-02
DE102020131192.3A DE102020131192A1 (de) 2020-04-30 2020-11-25 Vorrichtung und Verfahren zum Ermitteln einer Wärmeleitfähigkeit eines Fluids, Flüssigkeitsbehälter und Fahrzeug
DE102020134912.2A DE102020134912A1 (de) 2020-04-30 2020-12-23 Sensoranordnung für ein Fluid, Fluidtank und Verwendung der Sensoranordnung
PCT/EP2021/060677 WO2021219508A1 (fr) 2020-04-30 2021-04-23 Réseau de capteurs pour un fluide, réservoir de fluide et utilisation du réseau de capteurs

Publications (1)

Publication Number Publication Date
EP4143515A1 true EP4143515A1 (fr) 2023-03-08

Family

ID=78267641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21722154.8A Pending EP4143515A1 (fr) 2020-04-30 2021-04-23 Réseau de capteurs pour un fluide, réservoir de fluide et utilisation du réseau de capteurs

Country Status (3)

Country Link
EP (1) EP4143515A1 (fr)
DE (1) DE102020134912A1 (fr)
WO (1) WO2021219508A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020131192A1 (de) * 2020-04-30 2021-11-04 AST (Advanced Sensor Technologies) International GmbH Vorrichtung und Verfahren zum Ermitteln einer Wärmeleitfähigkeit eines Fluids, Flüssigkeitsbehälter und Fahrzeug
DE102024200908A1 (de) * 2024-01-31 2025-07-31 Siemens Mobility GmbH Landseitige virtuelle Wischwasserfüllstandsanzeige

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EP1329711B1 (fr) * 1997-12-31 2005-05-25 Honeywell Inc. Capteur thermique des caracteristiques d'un fluide et d'un flux avec un feedback loop qui force un element sensoriel dans un pont de wheatstone a suivre la resistance d'un resisteur variable du pont

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JP4390066B2 (ja) * 2004-10-25 2009-12-24 三井金属鉱業株式会社 液位検出方法及び液位検出装置
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EP2144044A1 (fr) 2008-07-08 2010-01-13 LindCom ApS Système pour la transmission à distance d'informations indicatives d'au moins un paramètre d'un fluide contenant au moins un réservoir sur un emplacement d'utilisateur à distance hors du réservoir
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EP1329711B1 (fr) * 1997-12-31 2005-05-25 Honeywell Inc. Capteur thermique des caracteristiques d'un fluide et d'un flux avec un feedback loop qui force un element sensoriel dans un pont de wheatstone a suivre la resistance d'un resisteur variable du pont

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Publication number Publication date
DE102020134912A1 (de) 2021-11-04
WO2021219508A1 (fr) 2021-11-04

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