WO2023161013A1 - Élément capteur, en particulier sous la forme d'un composant cms - Google Patents

Élément capteur, en particulier sous la forme d'un composant cms Download PDF

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Publication number
WO2023161013A1
WO2023161013A1 PCT/EP2023/052966 EP2023052966W WO2023161013A1 WO 2023161013 A1 WO2023161013 A1 WO 2023161013A1 EP 2023052966 W EP2023052966 W EP 2023052966W WO 2023161013 A1 WO2023161013 A1 WO 2023161013A1
Authority
WO
WIPO (PCT)
Prior art keywords
depot
electrically conductive
sensor element
component
conductor track
Prior art date
Application number
PCT/EP2023/052966
Other languages
German (de)
English (en)
Inventor
Wassili Leibel
Mirko TRAUE
Heiko Schumann
Christopher Kreis
Original Assignee
Volkswagen Aktiengesellschaft
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 Volkswagen Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Publication of WO2023161013A1 publication Critical patent/WO2023161013A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/121—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid for determining moisture content, e.g. humidity, of the fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/128—Microapparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
    • G01N27/225—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity by using hygroscopic materials

Definitions

  • the invention relates to a sensor element, in particular in the form of an SMD component, for detecting liquids on a component, for example on a printed circuit board or on a housing part. Furthermore, the invention relates to a corresponding sensor unit for sensing liquids with a corresponding sensor element. In addition, the invention relates to a corresponding circuit board for a control unit of a steering system and/or a battery system of a vehicle with a corresponding sensor unit. In addition, the invention relates to corresponding uses of a sensor element according to the invention and a printed circuit board according to the invention. Furthermore, the invention relates to a vehicle with a corresponding sensor unit.
  • the object of the invention is therefore to provide an improved sensor element for detecting liquids, in particular on printed circuit boards.
  • a sensor element in particular in the form of an SMD component, for detecting liquids on a component, for example on a printed circuit board or on a housing part, with the features of the independent device claim.
  • the invention relates to a corresponding sensor unit for sensing liquids with a corresponding sensor element having the features of the independent device claim.
  • the invention relates to a corresponding printed circuit board for a control unit of a steering system and/or a battery system of a vehicle with a corresponding sensor unit having the features of the independent device claim.
  • the invention relates to uses of a sensor element according to the invention and a printed circuit board according to the invention with the features of the independent use claims.
  • the invention relates to a vehicle with a corresponding sensor unit with the features of the independent device claim.
  • Features that are described in connection with individual aspects and/or embodiments of the invention also apply, of course, in connection with the other aspects and/or embodiments and vice versa, so that the disclosure of the individual aspects of the invention and/or embodiments is always mutually related is or can be taken.
  • the invention provides: a sensor element, in particular in the form of an SMD component, for detecting liquids on a component, for example on a printed circuit board or circuit board or on a housing part, having the sensor element: a depot, in particular a salt depot, for providing an electrolyte-forming substance, in particular a salt, a first electrically conductive connection for attaching the deposit to the component, e.g. on the printed circuit board or on the housing part, and for making electrical contact with a first conductor track and a second electrically conductive connection for attaching the deposit to the Component, e.g. on the printed circuit board or on the housing part, and for making electrical contact with a second conductor track.
  • a sensor element in particular in the form of an SMD component, for detecting liquids on a component, for example on a printed circuit board or circuit board or on a housing part, having the sensor element: a depot, in particular a salt depot, for providing an electrolyte-forming substance, in particular a salt, a
  • a salt depot can advantageously comprise at least one salt or several salts.
  • Salts in the context of the present disclosure can be understood to mean chemical compounds that have positively charged cations and negatively charged anions that electrostatically attract and thus create chemical compounds.
  • the term "water” in the context of the present disclosure is used for different liquids, for example. B. rain and / or puddle water, and / or for technical liquids such. B. coolants, lubricating fluids, etc.
  • the invention uses the sensor element to provide an SMD component or component (SMD stands for “Surface Mount Device”).
  • SMD Surface Mount Device
  • a depot in particular a salt depot
  • the depot can be in the form of a tablet, preferably comprising a compressed powder, such as e.g. B. Salt powder.
  • the depot is preferably provided with contacts, for example solderable ones, as electrically conductive connections.
  • the depot, in particular a salt depot has defined electrical properties as an SMD component, in particular a defined electrical resistance (in the range of several kOhm, accuracy +/-100 Ohm).
  • the conductivity of the water that comes into contact with the salt depot is significantly increased.
  • Such a component is also resistant to cold and heat (-40° C. - +120 ° C.).
  • An electrically conductive structure can also be integrated in the depot.
  • the electrically conductive structure can advantageously serve as a stabilizing support for the pressed salt.
  • the electrically conductive structure can represent a sensor structure.
  • the electrically conductive structure can also provide a defined electrical resistance. This enables a diagnosis of the condition of the salt depot.
  • the salt depot can be held in position in some form of enclosing mount (cage/housing) to stabilize the depot if required and/or to facilitate attachment of the depot to the baffle.
  • the sensor element is designed as an SMD component.
  • the sensor element can be relatively close to a measuring unit be positioned, which for the sake of simplicity can be implemented on a resistive measuring principle (resistance measurement is meant).
  • a measuring unit can sense the resistance or the applied voltage between the conductor tracks.
  • the measuring unit can contain a voltage divider, for example, and can measure the voltage via defined measuring points. Established methods for voltage measurement/resistance measurement can be used. For the sake of simplicity, this is referred to as a resistance measurement between the conductor tracks.
  • the measured voltages can be evaluated directly in the measuring unit or by a central processing unit.
  • At least one or more sensor elements can be provided, which can be connected to a measuring unit, for example.
  • Such sensor elements can be used in an advantageous manner to detect liquids on components, preferably on printed circuit boards or printed circuit boards, which in turn can be used in control devices, for example in steering systems and/or brake systems, in particular in steer-by-wire systems and/or break-by-wire systems in which no mechanical fallback level is provided, and/or in battery systems, such as e.g. B. power packs, high-voltage batteries, traction batteries, low-voltage batteries, auxiliary batteries, etc.
  • the senor element can be in the form of an SMD component.
  • the sensor element can be mounted on a component, e.g. B. on a circuit board, attached and electrically contacted.
  • the depot can be designed in the form of a tablet. In this way, a simple and inexpensive component for detecting water can be provided.
  • the depot has a compressed powdery electrolyte-forming substance, in particular salt.
  • the depot water such. B. rain and puddle water, easily absorb. Consequently, the depot can advantageously be used for resistance measurement in order to be able to sense water intrusion in a simple, safe and reliable manner.
  • the first electrically conductive connection can have a first contact element, in particular in the form of a soldering point, preferably containing tin, and/or that the second electrically conductive connection can have a second Contact element, in particular in the form of a solder joint, preferably having tin, may have.
  • the sensor element can be provided and used in a simple and inexpensive manner in terms of construction as an SMD component.
  • the component can preferably be designed as a printed circuit board.
  • the sensor element can be attached to the printed circuit board and electrically contacted using established methods for SMD components.
  • the depot can have a first, in particular one-piece, preferably integrally formed, electrically conductive structure with a first defined electrical resistance (comparatively high and easily measurable resistance).
  • the first electrically conductive structure can be electrically contacted with the first conductor track and the second conductor track.
  • the depot can be pressed around the structure. Self-diagnoses of the sensor element can be carried out with the aid of the first electrically conductive structure.
  • the first resistance can be measured at defined time intervals or sampling rates. If the first resistance is in a defined range, there is no water on the conductors or in the depot.
  • the first electrically conductive structure can be sinusoidal, meandering and/or grid-shaped, for example.
  • the first resistance can be set as desired by such an electrically conductive structure.
  • such an electrically conductive structure can enable a stabilizing and/or holding function for the depot.
  • the depot can have a second, in particular two-part, preferably integrally formed, electrically conductive structure with a second defined electrical resistance (comparatively low resistance).
  • the second electrically conductive structure can have a first partial structure and a second partial structure, which can be arranged separately from one another (meaning galvanically isolated) and/or spaced apart, in particular within the depot.
  • the first partial structure can be electrically contacted with the first conductor track and the second partial structure can be electrically contacted with the second conductor track.
  • the depot can be pressed around the structure.
  • the first partial structure and the second partial structure can preferably be comb-shaped and/or herringbone-shaped and/or can engage in one another.
  • the second electrically conductive structure can on the one hand serve as a carrier for the minerals and on the other hand form an advantageous measuring structure of the resistive sensor by means of a comb-like and/or herringbone-like and interlocking arrangement of two conductors.
  • the sensor is through the Salt depot is initially protected against little water, such as condensation, and is short-circuited when the salt depot is dissolved in the water.
  • the depot can be accommodated in a holder (cage/housing), for example made of a non-electrically conductive material. In this way, a fixation for the depot can be provided.
  • the attachment of the sensor element on the component, such. B. on the circuit board can be simplified.
  • the invention provides: a use of a sensor element, which can be embodied as described above, as an SMD component.
  • the invention provides: a sensor unit for sensing liquids, comprising: at least one or more sensor elements, which (s) can be designed as described above, and a measuring unit for detecting an electrical resistance between the first conductor track and the second conductor track .
  • the invention provides: a printed circuit board with a corresponding sensor unit, in particular for a control unit of a steering system and/or a battery system of a vehicle.
  • circuit board according to the invention can be used to achieve the same advantages that were described above in connection with the sensor element according to the invention. Reference is made in full to these advantages here.
  • the invention provides: a use of a corresponding printed circuit board for a control unit of a steering system and/or a battery system of a vehicle.
  • the invention provides: a vehicle with at least one corresponding sensor unit.
  • vehicle with at least one corresponding sensor unit.
  • the same advantages can be achieved that were described above in connection with the sensor element according to the invention. Reference is made in full to these advantages here.
  • the invention is illustrated in more detail with reference to the figures. It should be noted that the figures are only of a descriptive nature and are not intended to limit the invention in any way. Show it:
  • FIG. 1 shows an exemplary representation of a printed circuit board, a sensor unit and a sensor element within the scope of the present disclosure
  • a sensor unit 100 which can have at least one or more sensor elements 10, in particular in the form of SMD components, which are used to detect liquids on a component, preferably on a printed circuit board 101 or printed circuit board or on a housing part. are provided.
  • the sensor element 10 or one sensor element 10 in each case has: a depot 13, in particular a salt depot, for providing an electrolyte-forming substance, in particular a salt, a first electrically conductive connection 11 for fastening the depot 13 on the component, such as, for. B. the printed circuit board 101, and for electrical contacting of a first conductor track L1 and a second electrically conductive connection 12 for attachment of the depot 13 on the component such. B. the circuit board 101 and for electrical contacting of a second conductor track L2.
  • a depot 13, in particular a salt depot, in the context of the invention can contain at least one electrolyte-forming substance, such as. B. salt or several salts.
  • the invention provides With the help of the sensor element 10, an SMD component or component (SMD stands for “Surface Mount Device”) is ready.
  • SMD Surface Mount Device
  • the depot 13 can be in the form of a tablet, for example made of a compressed powder such as e.g. B. salt powder, are formed.
  • the electrolyte-forming substance or the salt content in the depot 13 is advantageously soluble in water.
  • the depot 13 can be provided as a fixed component.
  • a component can advantageously hold its shape and be well processed, in particular for fastening and for contacting the depot 13 on the component, such as e.g. B. on the circuit board 101.
  • the depot 13 has defined electrical properties, in particular a defined electrical resistance (in the range of several kOhm, accuracy +/-100 Ohm). The conductivity of the water that comes into contact with the depot 13 is increased significantly. Such a component is also resistant to cold and heat (-40° C - +120° C).
  • the depot 13 enriches the water with salts/minerals. In this way we conduct the penetrated water well.
  • the resistance between the conductor tracks L1, L2 drops significantly as a result.
  • the depot 13 is placed between the conductor tracks L1, L2 and is electrically conductively connected to a conductor track L1, L2, for example via a soldered connection. In this way, a defined electrical resistance is set between the conductor tracks L1, L2.
  • a measuring unit 20 which is shown schematically in FIG. 1, can sense the resistance and/or the voltage present between the conductor tracks L1, L2.
  • the measuring unit 20 can use established methods for voltage measurement/resistance measurement.
  • the measurements can be evaluated directly in the measuring unit 20 or by a central control unit.
  • At least one or more sensor elements 10 can be provided, which can be connected to a measuring unit 20, for example.
  • sensor elements 10 can contribute to the improved detection of liquids.
  • Such sensor elements 10 can be used in an advantageous manner for detecting liquids on components, preferably on printed circuit boards 101 or printed circuit boards or on housing parts in general, which can be used in particular in control devices, e.g. in steering systems and/or brake systems, in particular in steer-by-wire systems and/or brake-by-wire systems, and/or in battery systems, such as e.g. B. power packs, high-voltage batteries, traction batteries, low-voltage batteries, auxiliary batteries, etc.
  • the depot 13 can have a first, in particular one-piece, preferably integrally formed, electrically conductive structure S1 with a first defined electrical resistance R1 (comparatively high and easily measurable resistance, which can be determined, for example, by a relatively long and/or or thick wire can be provided).
  • the first electrically conductive structure S1 can be electrically contacted with the first conductor track L1 and the second conductor track L2.
  • the depot 13 can be pressed around the first electrically conductive structure S1.
  • the first electrically conductive structure S1 can be used for self-diagnosis of the sensor element 10.
  • the first resistor R1 can be measured at defined time intervals or sampling rates. If the first resistor R1 is in an intended range, then there is no water on the conductor tracks L1, L2 or in the depot 13. If water now occurs, albeit of low conductivity, on the component, such as, e.g. B. the circuit board 101, so initially there is no short circuit between the conductor tracks L1, L2 and the water is initially not detected. This is advantageous so that there are no false sensor stops, e.g. B. unproblematic condensation. If the water comes into contact with the depot 13, the depot 13 dissolves and enriches the water with minerals.
  • the conductivity of the water increases and a short circuit between the conductor tracks L1, L2 is detected.
  • the concept can be designed to be more robust.
  • the first electrically conductive structure S1 can be sinusoidal, meandering and/or grid-shaped, for example. Such an electrically conductive structure S1 can on the one hand be used to set the first resistance R1 as desired. On the other hand, a stabilizing and/or holding function for the depot 13 can be made possible by such an electrically conductive structure S1.
  • the depot 13 can have a second, in particular two-part, preferably integrally formed, electrically conductive structure S2 with a second defined electrical resistance R2 (comparatively low resistance).
  • the second electrically conductive structure S2 can have a first partial structure T1 and have a second partial structure T2, which can be arranged separately and/or at a distance from one another, in particular within the depot 13.
  • the first partial structure T1 can be electrically contacted with the first conductor track L1 and the second partial structure T2 with the second conductor track L2.
  • the depot 13 can be pressed around the second electrically conductive structure S2.
  • the first partial structure T1 and the second partial structure T2 can, for example, be comb-shaped and/or herringbone-shaped and/or can engage in one another.
  • the second electrically conductive structure S2 can on the one hand serve as a carrier for the minerals and on the other hand form the actual structure of the resistive sensor by means of a comb-like and/or herringbone-like and interlocking arrangement of two conductors.
  • the sensor element 10 is initially protected from a little water by the salt depot, e.g. B. condensation and is short-circuited when the salt depot is dissolved in the water.
  • the depot 13 can be accommodated in a holder 14 (cage/open housing), for example made of a non-electrically conductive material. In this way, a fixation for the powdery material of the depot 13 can be provided.
  • the attachment of the depot 13 on the component such. B. on the circuit board 101 can be simplified. But in this case too, the sensor element 10 is provided as an SMD component.
  • the holder 14 can be combined with a one-part electrically conductive structure S1 or with a two-part electrically conductive structure S2.
  • a corresponding sensor unit 100 also represents an aspect of the invention, which is designed to sense liquids and has: at least one or more sensor elements 10, which (s) can be designed as described above, and a measuring unit 20 for detecting a electrical resistance between the first conductor track L1 and the second conductor track L2.
  • a corresponding circuit board 101 with a corresponding sensor unit 100 also represents an aspect of the invention, which can be used in particular for a control unit of a steering system and/or a battery system of a vehicle.
  • a corresponding vehicle with at least one corresponding sensor unit 100 also represents an aspect of the invention.
  • the above description of the figures describes the present invention exclusively within the framework of examples. It goes without saying that individual features of the embodiments can be freely combined with one another, insofar as this makes technical sense, without departing from the scope of the invention.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un élément capteur (10) pour identifier des liquides sur un composant, l'élément capteur (10) comprenant : un réservoir (13), en particulier un réservoir de sel, pour fournir une substance de formation d'électrolyte ; une première connexion électroconductrice (11) pour fixer le réservoir (13) au composant et pour entrer en contact électrique avec une première piste conductrice (L1) ; et une seconde connexion électroconductrice (12) pour fixer le réservoir (13) au composant et pour entrer en contact électrique avec une seconde piste conductrice (L2).
PCT/EP2023/052966 2022-02-24 2023-02-07 Élément capteur, en particulier sous la forme d'un composant cms WO2023161013A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022201926.1 2022-02-24
DE102022201926.1A DE102022201926A1 (de) 2022-02-24 2022-02-24 Sensorelement, insbesondere in Form eines SMD-Bauelementes

Publications (1)

Publication Number Publication Date
WO2023161013A1 true WO2023161013A1 (fr) 2023-08-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/052966 WO2023161013A1 (fr) 2022-02-24 2023-02-07 Élément capteur, en particulier sous la forme d'un composant cms

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DE (1) DE102022201926A1 (fr)
WO (1) WO2023161013A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5179347A (en) * 1992-04-10 1993-01-12 Irrometer Company, Inc. Electrical sensor for sensing moisture in soils
WO1999041603A1 (fr) * 1998-02-11 1999-08-19 E + E Elektronik Ges.Mbh Composant pour mesurer la concentration de gaz
WO2000028311A1 (fr) * 1998-11-06 2000-05-18 E+E Elektronik Ges.Mbh Systeme de mesure de l'humidite
DE102007028793A1 (de) * 2007-06-22 2009-01-02 Continental Automotive Gmbh Elektronisches Lenksystem für ein Kraftfahrzeug, elektronische Steuereinheit, Leiterplatte und Verfahren zum Ermitteln eines Feuchtigkeitsgehalts in der elektronischen Steuereinheit
US20130039380A1 (en) * 2006-11-13 2013-02-14 Vishay Bccomponents Beyschlag Gmbh Sensor device
DE102013103127B3 (de) * 2013-03-27 2014-05-15 Technische Universität Dresden Feuchtigkeitssensorelement und Verfahren zum Herstellen desselben
US20150061706A1 (en) * 2013-08-27 2015-03-05 Council Of Scientific & Industrial Research Resistive type humidity sensor based on porous magnesium ferrite pellet
US20150293046A1 (en) * 2014-04-09 2015-10-15 International Business Machines Corporation Salt-Based Device and a Circuit to Monitor and Log the Times a Data Center Air Goes Above a Predefined Limit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136274A (en) 1990-02-01 1992-08-04 Mitsubishi Gas Chemical Company, Inc. Humidity sensor
EP3260853B1 (fr) 2009-03-27 2020-03-11 ams International AG Dispositif de capteur et son procédé de fabrication
JP2014234102A (ja) 2013-06-04 2014-12-15 株式会社ジェイテクト ステアリング装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5179347A (en) * 1992-04-10 1993-01-12 Irrometer Company, Inc. Electrical sensor for sensing moisture in soils
WO1999041603A1 (fr) * 1998-02-11 1999-08-19 E + E Elektronik Ges.Mbh Composant pour mesurer la concentration de gaz
WO2000028311A1 (fr) * 1998-11-06 2000-05-18 E+E Elektronik Ges.Mbh Systeme de mesure de l'humidite
US20130039380A1 (en) * 2006-11-13 2013-02-14 Vishay Bccomponents Beyschlag Gmbh Sensor device
DE102007028793A1 (de) * 2007-06-22 2009-01-02 Continental Automotive Gmbh Elektronisches Lenksystem für ein Kraftfahrzeug, elektronische Steuereinheit, Leiterplatte und Verfahren zum Ermitteln eines Feuchtigkeitsgehalts in der elektronischen Steuereinheit
DE102013103127B3 (de) * 2013-03-27 2014-05-15 Technische Universität Dresden Feuchtigkeitssensorelement und Verfahren zum Herstellen desselben
US20150061706A1 (en) * 2013-08-27 2015-03-05 Council Of Scientific & Industrial Research Resistive type humidity sensor based on porous magnesium ferrite pellet
US20150293046A1 (en) * 2014-04-09 2015-10-15 International Business Machines Corporation Salt-Based Device and a Circuit to Monitor and Log the Times a Data Center Air Goes Above a Predefined Limit

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