EP1946060A1 - Capteur de pression pour fluides hydrauliques dans les systemes de freins de vehicules a moteur et son utilisation - Google Patents

Capteur de pression pour fluides hydrauliques dans les systemes de freins de vehicules a moteur et son utilisation

Info

Publication number
EP1946060A1
EP1946060A1 EP06778327A EP06778327A EP1946060A1 EP 1946060 A1 EP1946060 A1 EP 1946060A1 EP 06778327 A EP06778327 A EP 06778327A EP 06778327 A EP06778327 A EP 06778327A EP 1946060 A1 EP1946060 A1 EP 1946060A1
Authority
EP
European Patent Office
Prior art keywords
membrane
sensor according
sensor
pressure
pressure sensor
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Withdrawn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
EP06778327A
Other languages
German (de)
English (en)
Inventor
Roland Burghardt
Carsten Zahout-Heil
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
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 Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1946060A1 publication Critical patent/EP1946060A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0051—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance
    • G01L9/0052—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of piezoresistive elements
    • G01L9/0055—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of piezoresistive elements bonded on a diaphragm
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/08—Means for indicating or recording, e.g. for remote indication
    • G01L19/086—Means for indicating or recording, e.g. for remote indication for remote indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
    • G01L9/0075—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance using a ceramic diaphragm, e.g. alumina, fused quartz, glass

Definitions

  • the invention relates to a pressure sensor according to the preamble of claim 1 and its use.
  • DE 199 63 786 A1 discloses a pressure sensor which is basically suitable for use in an electronically controlled brake system for determining the pressure of a hydraulic fluid.
  • the sensor consists essentially of a semiconductor layer, which is applied to a Borsili ⁇ katglas. If the sensor is pressurized, a mechanical stress arises in the material between the layers, which can be measured on the basis of the piezoelectric effect by suitably mounted electrical electrodes. Due to the materials used is known from the above reference pressure sensor for ag ⁇ sive media without an additional protective measure, such as an embedded in silicon, can be used.
  • the invention relates to a pressure sensor, in particular for measuring pressures greater than 100 bar, with a through Pressurizing deflectable and / or deformable membrane.
  • a closed (first) hollow volume which is filled in particular at least partially ⁇ with a gas or a gas mixture.
  • the membrane is essentially flat (without any pressure difference) and rests on a support frame for the membrane, which tightly seals off the edge region of the membrane from a base body on which the support frame rests.
  • the support frame may be manufactured separately or brought on ⁇ or be part of a molding of the main body or the membrane surface.
  • the pressure sensor has at least one pressure transducer, which converts the deflection and / or deformation of the membrane into at least one electrical variable according to the capacitive, piezoresistive or another principle or with the aid of at least one strain gauge.
  • the pressure sensor is tightly gekap ⁇ sible on all sides and has no guided outward electrical contacts or lines.
  • the all-round sealed enclosure provides the advantage that a long life of the sensor is achieved even under harsh, humid ambient conditions.
  • the sensor is suitable for use in liquids, particularly preferably in aggressive media.
  • At least one electrically conductive measuring electrode is located in the region of the membrane surface, so that it is moved by the preformable membrane surface.
  • a counter electrode is present, which is attached to the main body and forms a capacitor together with the measuring electrode.
  • the membrane surface has a substantially non-deformed part, which is for example in the vicinity of the Ran ⁇ , on which is provided with a reference electrode, which allows a capacitive reference measurement in conjunction with the or another counter electrode.
  • a reference electrode which allows a capacitive reference measurement in conjunction with the or another counter electrode.
  • the base body and / or the support frame is preferably at least partially made of a corrosion-resistant material, in particular based on plastic or metal or ceramic.
  • the membrane is preferably made of either metal, plastic or a ceramic material. The materials mentioned may also contain small amounts of components of other materials, as long as the desired corrosion resistance is not significantly affected thereby.
  • the membrane consists of a ceramic material whose pressure-dependent deflection is determined to be particularly capacitive.
  • the membrane is also possible and therefore provided as an alternative preferred embodiment to equip the pressure sensor according to the invention with pressure-resistively changeable electrical conductor structures and in this way to provide a variable by the pressurization electrical signal available. It is expedient that the membrane is a pressure measuring plate.
  • the membrane surface is part of the housing.
  • the advantage is a very high resistance to aggressive media measurement, such as a high pressure fluid.
  • Possible materials for deformation body are then also ceramic, metal, glass but also plastic.
  • the degree of pressurization is not capacitive, but measured with resistively pressure-dependent measuring structures, which are connected to the electronic unit.
  • the sensor ⁇ form with a resistive measurement structure is preferably used of the resistive structure of the piezoresistive effect or dehnungsinduzier- te change of shape.
  • the deformation element is preferably formed monolithically from silicon. The actual measuring elements are then implanted in particular in the pressure measuring plate. Upon initiation of a pressure, a mechanical stress is generated in the membrane and / or the pressure measuring plate.
  • the resistive structures can be produced as a thin film or thick film. However, the resistive structures are preferably applied as thick-film material. It is expedient that the sensor in the housing for processing a signal ⁇ for processing the at least one electrical ⁇ rule output variable having the pressure transducer.
  • the senor for processing the capacitor voltage or in the case of the resistive conductor has a signal processing electrically connected to the corresponding structures.
  • This signal processing is designed in particular as a user-specific integrated circuit.
  • the sensor preferably further comprises means coupled to said signal processing ⁇ or integrated in this Sendeein ⁇ direction for wireless transmission of print information.
  • the sensor uses a particular tegrated in the sensor in ⁇ additional antenna structure and / or a formant ⁇ nentechnik, which is in particular an electrode of the condensate ⁇ sator structure. This has the advantage that compared to be ⁇ known pressure sensors no corrosion-sensitive electrical contacts are needed to the outside.
  • the senor is designed for a, in particular periodic ⁇ cal, measurement and / or data transmission at defined time ⁇ points.
  • expedient is the design of the sensor for a constant measurement and / or REMtra ⁇ tion.
  • the wireless signal transmission is well known.
  • the sensor has an internal source, which makes Ener ⁇ (battery) and systems in which the sensor is fed through an external electromagnetic field and this energy for periodically transmitting uses its values. All systems have in common that you need an antenna to carry over ⁇ and usually have a signal pre-processing and a high-frequency part.
  • the signal processing is preferably carried out integrated.
  • the sensor is expediently cylindrical, wherein the cylinder height is particularly suitably smaller than the cylinder diameter.
  • the basic body together with bearing surface and membrane forms a first cavity and additionally with a cover arranged opposite the membrane side and also opposite to the membrane introduced into the base recess a further cavity, wherein integrated in the further cavity signal processing is.
  • an antenna structure is preferably arranged, which is placed in particular on the inner surface of the cover.
  • the invention also relates to the use of the previously described sensor in motor vehicle control devices, in particular in motor vehicle brake control devices. Further preferred is the use of the sensor in directly measuring tire pressure monitoring systems. Further preferred embodiments will become apparent from the following description of an embodiment with reference to figures.
  • FIG. 1 is a schematic representation of a capacitive pressure sensor with a cavity in cross-section
  • FIG. 3 shows the pressure sensor according to FIGS. 1 and 2 in a spatial representation
  • Fig. 4 shows a second example of a pressure sensor with two cavities
  • Fig. 5 is an illustration of the sensor according to Fig. 1 with signal processing circuit and antenna structure.
  • the capacitive pressure sensor in FIG. 1 consists of a deformable ceramic membrane 1 which rests on a base body 3 made of ceramic via a solder ring 2.
  • a first metallic capacitor plate 4 (measuring electrode) is fixedly connected to the membrane.
  • a metallic second metallic Kon ⁇ capacitor plate 5 (counter electrode).
  • Electrode 4 is a further, electrically isolated from the measuring electrode reference electrode 8.
  • counter electrode 5 is designed so large that it is both measuring electrode 4 and reference electrode 7 opposite.
  • Lotring 2 forms an annular support frame for membrane 1 on the base 3.
  • the second capacitor plate 5 is directly connected to ASIC 7.
  • ASIC 7 a user-specific integrated circuit is included, which is electrically conductively connected to the capacitor plates 4, 5 and reference electrode 8. It is also possible according to an example not shown that counter electrode is combined with ASIC 7. is formed directly by the ASIC that also carries the pri ⁇ mare signal processing. Via a leadframe, the processed signals are routed to the outside. The housing is closed by a glued lid, for example. Metal or ceramic.
  • Fig. 2 shows the pressure sensor in Fig. 1 with a deformed by pressurization membrane 1 '.
  • the pressure-induced deflection of the membrane reduces the distance between the capacitor plates 4 and 5. This results in an electrically measurable increase in the capacitance of the capacitor formed by the capacitor plates 4, 5.
  • Fig. 3 the capacitive pressure sensor according to Figures 1 and 2 is shown in three-dimensional view.
  • FIG. 4 illustrates an example of a sensor having an antenna structure 9 and an additional cavity 8.
  • the antenna structure described in FIG. 4 may also be provided in the sensor according to FIGS. 1 to 3 according to an example which is not shown.
  • Antenna structure 4 is formed spirally. This can be applied by Dunnfilm- (CVD, sputtering) or thick film process in the desired shape.
  • the antenna structure can be applied by means of lithographic processes with a subsequent etching process.
  • HF components can be applied to membrane 1.
  • FIG. 4 shows a sensor with a further cavity 8, which is formed on the opposite side of the base body 3 as a recess. Cavity 8 is closed by a lower cover 10. ASIC 7 can be arranged in the lower cavity 8. Antenna structure 9 is placed in cavity 8 on cover 10. A connection of ASIC 7 with antenna structure 9 or the electrodes 4, 5 and 8 takes place either via bonding wires or other suitable connection technologies.
  • the components antenna structure 9, ASIC 7 with integrated RF transmitter are integrated together in the housing of the pressure sensor. This results in an all-round encapsulation of the sensor.
  • the sensor according to FIG. 5 differs from the previously explained sensors in that the capacitor plates are replaced by resistive layers 11.
  • the arrangement of ASIC 7 in cavity 6 corresponds to beispielgeclaren, not shown embodiment of a sensor according to FIG. 1 with ASIC.
  • Resistive layers 11 are applied to membrane 1 by means of thin-film or thick-film technologies. It is likewise possible to adhere suitable silicon elements known per se to membrane 1 for deformation measurement.
  • ⁇ hollow space 6 and 8 may alternatively be filled with oil or with some other material.
  • the senor has a pressure measuring plate instead of the membrane.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Drucksensor, insbesondere zur Messung von Drücken größer als 100 bar, mit einer durch Druckbeaufschlagung auslenkbaren und/oder verformbaren Membran (1, 1'), einem unter der Membran liegenden abgeschlossenen Hohlvolumen (6), welches insbesondere zumindest teilweise mit einem Gas oder einer Gasmischung gefüllt ist, einem Auflagerahmen (2) für die Membran, welcher den Randbereich der Membran gegenüber einem Grundkörper (3) dicht abschließt, und mit zumindest einem Druckmesswandler, welcher die Auslenkung und/oder Verformung der Membran nach dem kapazitiven, piezoresistiven oder einem anderen Prinzip oder mit Hilfe mindestens eines Dehnungsmessstreifens in mindestens eine elektrische Größe umwandelt, wobei der Drucksensor allseitig dicht gekapselt ist und keine nach außen geführten elektrischen Kontakte oder Leitungen aufweist.
EP06778327A 2005-08-23 2006-08-23 Capteur de pression pour fluides hydrauliques dans les systemes de freins de vehicules a moteur et son utilisation Withdrawn EP1946060A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005039980 2005-08-23
PCT/EP2006/065602 WO2007023168A1 (fr) 2005-08-23 2006-08-23 Drucksensor fur hydraulische medien in kraftfahrzeugbremssystemen und dessen verwendung
DE102006039422A DE102006039422A1 (de) 2005-08-23 2006-08-23 Drucksensor für hydraulische Medien in Kraftfahrzeugbremssystemen und dessen Verwendung

Publications (1)

Publication Number Publication Date
EP1946060A1 true EP1946060A1 (fr) 2008-07-23

Family

ID=37763289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06778327A Withdrawn EP1946060A1 (fr) 2005-08-23 2006-08-23 Capteur de pression pour fluides hydrauliques dans les systemes de freins de vehicules a moteur et son utilisation

Country Status (4)

Country Link
US (1) US8443676B2 (fr)
EP (1) EP1946060A1 (fr)
DE (1) DE102006039422A1 (fr)
WO (1) WO2007023168A1 (fr)

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DE102007054828A1 (de) * 2007-08-08 2009-03-12 Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. Sensorelement und ein Verfahren zur Herstellung eines kapazitiven Sensors
DE102008054879B4 (de) 2008-12-18 2023-08-31 Endress+Hauser SE+Co. KG Drucksensor
DE102011085329A1 (de) 2011-10-27 2013-05-02 Continental Teves Ag & Co. Ohg Optischer Druckfühler und Verfahren zum optischen Erfühlen eines Drucks
JP5990933B2 (ja) 2012-02-29 2016-09-14 オムロン株式会社 圧力センサパッケージの製造方法
US20130300571A1 (en) * 2012-04-18 2013-11-14 Farrokh Mohamadi Interrogation of active and passive proppants for real-time monitoring of fractured wells
DE102013222516A1 (de) 2012-11-15 2014-06-12 Continental Teves Ag & Co. Ohg Drucksensor zur Bestimmung eines hydraulischen und/oder pneumatischen Drucks, Verfahren zur Justage des Drucksensors sowie Verwendung des Drucksensors
DE102013210349A1 (de) 2013-06-04 2014-12-04 Conti Temic Microelectronic Gmbh Optische Druckmessvorrichtung und optisches Druckmessverfahren
DE102013222129B3 (de) * 2013-10-30 2014-10-09 Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. Kapazitives Sensorelement mit integrierter Mess- und Referenzkapazität
DE102014200507A1 (de) 2014-01-14 2015-07-16 Robert Bosch Gmbh Mikromechanische Drucksensorvorrichtung und entsprechendes Herstellungsverfahren
US10343597B2 (en) * 2014-12-02 2019-07-09 Francesco PAVONI Braking signalling system for bicycles, motorcycles and cars, equipped with hydraulic braking
GB2542332A (en) * 2015-06-29 2017-03-22 Continental automotive systems inc Pressure sensor device with a MEMS piezoresistive element attached to an in-circuit ceramic board
JP6581849B2 (ja) * 2015-09-01 2019-09-25 アズビル株式会社 微細機械装置
DE102015122287A1 (de) * 2015-12-18 2017-07-06 Endress + Hauser Gmbh + Co. Kg Kapazitiver Differenzdrucksensor
TWI623733B (zh) * 2016-08-25 2018-05-11 蘇州明皜傳感科技有限公司 壓力感測器以及其製造方法
TWI630330B (zh) 2016-11-15 2018-07-21 財團法人工業技術研究院 智慧機械元件
DE102018209563B3 (de) 2018-06-14 2019-07-18 Siemens Aktiengesellschaft Multifunktionaler Sensor für die Prozessindustrie
CN110044521B (zh) * 2019-05-29 2020-12-04 南京元感微电子有限公司 测量固体间压力的力传感器
FR3105415B1 (fr) * 2019-12-23 2021-12-24 Commissariat Energie Atomique Capteur autonome à membrane

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Also Published As

Publication number Publication date
WO2007023168A1 (fr) 2007-03-01
US8443676B2 (en) 2013-05-21
US20100263452A1 (en) 2010-10-21
DE102006039422A1 (de) 2007-03-15

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