EP3092470A1 - Capteur de pression servant à détecter la pression d'un milieu fluide - Google Patents

Capteur de pression servant à détecter la pression d'un milieu fluide

Info

Publication number
EP3092470A1
EP3092470A1 EP14795623.9A EP14795623A EP3092470A1 EP 3092470 A1 EP3092470 A1 EP 3092470A1 EP 14795623 A EP14795623 A EP 14795623A EP 3092470 A1 EP3092470 A1 EP 3092470A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pressure sensor
sensor element
separation membrane
circuit
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Withdrawn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
EP14795623.9A
Other languages
German (de)
English (en)
Inventor
Alexander Lux
Patrik Patzner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3092470A1 publication Critical patent/EP3092470A1/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Withdrawn legal-status Critical Current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
    • 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
    • G01L19/14—Housings
    • 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
    • G01L19/14—Housings
    • G01L19/141—Monolithic housings, e.g. molded or one-piece housings
    • 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
    • G01L9/006—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of metallic strain gauges fixed to an element other than the pressure transmitting diaphragm
    • G01L2009/0063—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of metallic strain gauges fixed to an element other than the pressure transmitting diaphragm using a fluid coupling between strain gauge carrier and diaphragm
    • 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
    • G01L2009/0066—Mounting arrangements of diaphragm transducers; Details thereof, e.g. electromagnetic shielding means
    • G01L2009/0067—Mounting arrangements of diaphragm transducers; Details thereof, e.g. electromagnetic shielding means with additional isolating diaphragms

Definitions

  • Pressure sensor for detecting a pressure of a fluid medium
  • Dynamically acting pressure sensors are only used to measure pressure oscillations in gaseous or liquid media.
  • the pressure measurement can be direct, over
  • the most widely used method of pressure detection therefore initially uses a thin membrane as a mechanical intermediate stage for signal extraction, which is exposed to pressure on one side and more or less sags under its influence. It can within wide limits of thickness and diameter of the respective
  • Pressure range to be adjusted Low pressure ranges result in comparatively large diaphragms with deflections that can range from 0.1 mm to 1 mm. High pressures, however, require thicker membranes of small diameter, which usually bend only a few microns.
  • Such pressure sensors are, for example, Konrad Reif (ed.): Sensors in the motor vehicle, 1. Ed. 2010, pages 80-82 and 134-136.
  • DE 10 2008 054 382 A1 describes a pressure sensor module which comprises a pressure sensor chip for determining the pressure of a measuring medium, an adapter for transmitting pressure to the pressure sensor chip, a plug part contacted with the pressure sensor chip and fastening means for fixing the pressure sensor module in a receiving opening of a wall.
  • Pressure sensors good, but because of water and particles that can settle on the membrane, problematic.
  • the pressure range is limited and soldering is susceptible to corrosion.
  • passivated with a gel diffusion of the medium through the gel is present and may be due to various chemical and / or physical processes for altering the protective effect or
  • a pressure sensor for detecting a pressure of a fluid medium which at least largely avoids the disadvantages of known pressure sensors and which provides a robust design of the media resistance for, for example, pressure sensors for particle filter diagnosis while simultaneously expanding the pressure range for new applications, such as exhaust back pressure. allows.
  • An inventive pressure sensor for detecting a pressure of a fluid medium in a measuring chamber comprises a sensor housing, at least a first
  • Pressure sensor element for measuring a pressure of the medium and a drive and / or evaluation circuit for outputting a signal indicative of the pressure acting on the pressure sensor element signal.
  • the drive and / or evaluation circuit is on or in a circuit carrier arranged within the sensor housing arranged.
  • the pressure sensor element is arranged on or in the circuit carrier and separated from the fluid medium by means of at least one first separation membrane.
  • the pressure sensor element is integrated in the circuit carrier.
  • the pressure sensor element may be spaced from the separation membrane.
  • a transfer space is formed between the pressure sensor element and the separation membrane.
  • the transfer space may be filled with a transfer medium suitable for transferring a pressure of the fluid medium acting on the separation membrane to the pressure sensor element.
  • the transmission medium can be a
  • the transfer medium is a liquid which has a low thermal expansion, low viscosity and low water absorption in order to be insensitive to temperature influences.
  • the transmission medium is an oil.
  • the pressure sensor element may be in a
  • Sensor element space may be arranged in the circuit carrier.
  • the sensor element space can be filled with a transmission medium. For example, that is
  • the sensor element space can be closed by means of a closure element.
  • the sensor element space can from an interior of the
  • Sensor housing be separated by a second separation membrane.
  • Separating membrane can be designed for applying a counter-pressure.
  • Transfer medium in the sensor element space may be suitable for transferring the counterpressure acting on the second separation membrane to the first sensor element.
  • At least one second pressure sensor element may be arranged on or in the circuit carrier, which is designed to measure a counter-pressure applied to the first separation membrane.
  • the back pressure can be applied electrically or mechanically. Such an arrangement allows the detection of a differential pressure.
  • a basic idea of the present invention is to provide an oil reservoir integrated with the circuit carrier with a pressure sensor element.
  • the measuring elements are integrated into the circuit carrier, for example by means of so-called embedding.
  • the pressure feeds are here to make open.
  • a separation membrane is integrated into the circuit carrier and filled the resulting volumes by a suitable pressure transmission medium.
  • the measuring elements for the pressure measurement can be designed as 1-chip, ie membrane with integrated evaluation circuit, or 2-chip, ie membrane with separate evaluation circuit.
  • there are several Measuring elements can be installed per circuit carrier.
  • the separation membrane is used to separate the externally applied fluid medium to be measured, such as air or exhaust gases or the like, and the pressure transfer medium from each other.
  • Separating membrane is made of a media-resistant material with a suitable coating for further application. It is important that besides the media resistance the
  • Separation membrane sufficiently good flexibility, d. H. as soft as possible. This can be achieved, for example, by a design that is as thin as possible. Possible
  • the separation membranes are steel, PTFE, PI or the like.
  • the pressure transfer medium is typically an oil of low thermal expansion, low viscosity and low water uptake
  • circuit carrier On the circuit board connections for electrical contacting are present.
  • the pressure sensor element can comprise a sensor membrane designed as a measuring bridge with one or more piezoresistive elements and / or other types of sensitive elements, as is customary in pressure sensors.
  • the above-described prior art in particular Konrad Reif (ed.): Sensors in the motor vehicle, 1. Ed. 2010, pages 80-82 and 134-136.
  • an evaluation and control circuit is a component which is suitable for signal processing.
  • the evaluation or control circuit may be an application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • Circuit is an electronic circuit that is realized as an integrated circuit.
  • a circuit carrier is to be understood as meaning any component which is suitable for carrying a circuit.
  • the circuit carrier is to be understood as meaning any component which is suitable for carrying a circuit.
  • Figure 1 is a cross-sectional view of a pressure sensor according to a first
  • Figure 2 is a cross-sectional view of a pressure sensor according to a second
  • Figure 3 is a cross-sectional view of a pressure sensor according to a third
  • Embodiment Embodiments of the invention
  • Figure 1 shows a cross-sectional view of a pressure sensor 10 for detecting a pressure of a fluid medium according to a first embodiment.
  • the pressure sensor 10 may, for example, for detecting a pressure in a fuel line of a
  • the pressure sensor 10 shown in FIG. 1 is particularly suitable for particle filter diagnosis.
  • the pressure sensor 10 includes a sensor housing 12
  • a transfer space 28 is formed between the first pressure sensor element 16 and the first separation membrane 26.
  • the transfer room 28 is with a
  • the transfer medium is for transferring a pressure of the fluid medium acting on the first separation membrane 26 to the first one
  • the first separation membrane 26 is made of a media-resistant material with a suitable coating. The material is selected taking into account that in addition to the media resistance, the first separation membrane 26 has a sufficiently good flexibility, that is as soft as possible. This can be achieved, for example, by a design that is as thin as possible. Possible materials for the first separation membrane 26 are steel, PTFE, PI or the like.
  • the first pressure sensor element 16 is arranged in particular in a sensor element space 30 in the printed circuit board 20.
  • the sensor element space 30 is also connected to the
  • the sensor element space 30 is separated from the housing interior 14 of the sensor housing 12 by means of a second separation membrane 32.
  • the second separation membrane 32 may be made identical to the first separation membrane 26.
  • the sensor element space 30 is closed by means of a closure element 34.
  • no transfer space 28 is provided as compared with the first embodiments.
  • the pressure sensor 10 shown in FIG. 2 only the first separation membrane 26 is provided.
  • at least one second pressure sensor element 38 is arranged, which is designed to measure a counterpressure applied to the first separating membrane 26.
  • the sensor element space 30 is formed, which may be referred to as the first sensor element space 30, but also a second sensor element space 40.
  • the second pressure sensor element 38 is in the second
  • the pressure sensor 10 shown in Figure 2 is thus suitable for detecting a force acting on the first separation membrane 26 pressure of the fluid medium and a counter pressure applied thereto.
  • the back pressure can for example be applied electrically. This also allows the detection of a differential pressure.
  • FIG. 3 shows a cross-sectional view of a pressure sensor 10 according to a third embodiment of the present invention. Below are only the
  • the first pressure sensor element 16 is arranged in the sensor element space 30 and separated from the fluid medium by means of the first separation membrane 26.
  • Sensor element space 30 is filled with a transmission medium, such as oil, and closed by a closure element 34.
  • a pressure of the fluid medium acting on the first separation membrane 26 can be detected.
  • the pressure sensor 10 of the third embodiment is suitable for detecting an absolute pressure, as required, for example, in the detection of an exhaust backpressure before or upstream of a turbocharger.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un capteur de pression (10) servant à détecter une pression d'un milieu fluide dans un espace de mesure. Le capteur de pression (10) comprend un boîtier de capteur (12), au moins un premier élément détecteur de pression (16) servant à mesurer une pression du milieu, et un circuit de commande et/ou d'analyse (22) servant à délivrer un signal indiquant la pression qui agit sur le premier élément détecteur de pression (16). Le circuit de commande et/ou d'analyse (22) est disposé sur ou dans un support de circuit (18) disposé à l'intérieur du boîtier de capteur (12). Le premier élément détecteur de pression (16) est disposé sur ou dans le support de circuit (18) et séparé du milieu fluide par au moins une première membrane séparatrice (26).
EP14795623.9A 2014-01-08 2014-11-06 Capteur de pression servant à détecter la pression d'un milieu fluide Withdrawn EP3092470A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014200082.3A DE102014200082A1 (de) 2014-01-08 2014-01-08 Drucksensor zur Erfassung eines Drucks eines fluiden Mediums
PCT/EP2014/073937 WO2015104076A1 (fr) 2014-01-08 2014-11-06 Capteur de pression servant à détecter la pression d'un milieu fluide

Publications (1)

Publication Number Publication Date
EP3092470A1 true EP3092470A1 (fr) 2016-11-16

Family

ID=51868231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14795623.9A Withdrawn EP3092470A1 (fr) 2014-01-08 2014-11-06 Capteur de pression servant à détecter la pression d'un milieu fluide

Country Status (5)

Country Link
US (1) US10240993B2 (fr)
EP (1) EP3092470A1 (fr)
CN (1) CN105899926B (fr)
DE (1) DE102014200082A1 (fr)
WO (1) WO2015104076A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6283307B2 (ja) * 2014-12-24 2018-02-21 長野計器株式会社 物理量測定装置
DE102017213768A1 (de) * 2017-08-08 2019-02-14 Robert Bosch Gmbh Drucksensor und Verfahren zum Herstellen eines Drucksensors
KR102584352B1 (ko) * 2019-02-27 2023-09-27 키스틀러 홀딩 아게 센서
US11788918B2 (en) 2020-06-18 2023-10-17 Trevillyan Labs, Llc Fluid detection fabric
CN113701939B (zh) * 2021-08-30 2023-10-27 北京京东方技术开发有限公司 压力传感器及其制造方法、压力感测装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008021091A1 (de) * 2008-04-28 2009-10-29 Epcos Ag Drucksensor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6311561B1 (en) * 1997-12-22 2001-11-06 Rosemount Aerospace Inc. Media compatible pressure sensor
DE10054013B4 (de) 2000-11-01 2007-06-21 Robert Bosch Gmbh Drucksensormodul
US7793550B2 (en) * 2008-08-25 2010-09-14 Infineon Technologies Ag Sensor device including two sensors embedded in a mold material
DE102008044098A1 (de) * 2008-11-27 2010-06-02 Robert Bosch Gmbh Sensoranordnung zur Differenzdruckerfassung und Verfahren zu deren Herstellung
DE102008054382A1 (de) 2008-12-08 2010-06-10 Robert Bosch Gmbh Drucksensormodul
DE102014221067A1 (de) * 2014-10-16 2016-04-21 Robert Bosch Gmbh Drucksensor zur Erfassung eines Drucks eines fluiden Mediums

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008021091A1 (de) * 2008-04-28 2009-10-29 Epcos Ag Drucksensor

Also Published As

Publication number Publication date
US20160334291A1 (en) 2016-11-17
DE102014200082A1 (de) 2015-07-09
CN105899926B (zh) 2019-09-03
WO2015104076A1 (fr) 2015-07-16
US10240993B2 (en) 2019-03-26
CN105899926A (zh) 2016-08-24

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