DE102004021523A1 - Capacitive fluid parameter sensor has electrode and link sections as metallised working areas on injection moulded support - Google Patents
Capacitive fluid parameter sensor has electrode and link sections as metallised working areas on injection moulded support Download PDFInfo
- Publication number
- DE102004021523A1 DE102004021523A1 DE200410021523 DE102004021523A DE102004021523A1 DE 102004021523 A1 DE102004021523 A1 DE 102004021523A1 DE 200410021523 DE200410021523 DE 200410021523 DE 102004021523 A DE102004021523 A DE 102004021523A DE 102004021523 A1 DE102004021523 A1 DE 102004021523A1
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- Prior art keywords
- contact
- sensor
- inner body
- sensor according
- electrode
- Prior art date
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- Withdrawn
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 4
- 238000002347 injection Methods 0.000 title abstract description 4
- 239000007924 injection Substances 0.000 title abstract description 4
- 238000001746 injection moulding Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000001465 metallisation Methods 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 10
- 239000004734 Polyphenylene sulfide Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229920000106 Liquid crystal polymer Polymers 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- -1 For example Substances 0.000 description 1
- 229910007637 SnAg Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2888—Lubricating oil characteristics, e.g. deterioration
-
- 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
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pathology (AREA)
- Immunology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Die Erfindung betrifft einen Sensor zur kapazitiven Bestimmung von Flüssigkeitsparametern nach Anspruch 1.The The invention relates to a sensor for the capacitive determination of liquid parameters Claim 1.
Derartige Sensoren finden als Ölstandssensoren unter anderem in Motoren, Getrieben sowie Hydrauliksystemen Anwendung. Neben dem Füllstand des Öles und der Öltemperatur werden dabei auch Qualitätsdaten des Öles über eine elektrische Schnittstelle an ein nachfolgendes sensorexternes Steuergerät geliefert, wo eine Auswertung der Messdaten erfolgt. Ein solcher Ölzustandssensor wird auch QLT- oder oil quality, level and temperature-Sensor bezeichnet. In einem solchen Ölzustandssensor wird beispielsweise der Füllstand mit einem Kondensatorelement erfasst. Auch zur Messung der Ölqualität, welche von der Dielektrizitätskonstante des Öles abhängt, wird ein Kondensator verwendet. Diese Kondensatoren werden bei bekannten Ölzustandssensoren auf einem Sensorrohr aus Edelstahl realisiert. Die dabei verwendeten Herstellungsprozesse sind sehr aufwendig. Die bekannten Sensorrohre müssen zudem mit hohem Montageaufwand in einem entsprechenden Gehäuse angeordnet und die Kondensatoren müssen über aufwendige Federkontakte angeschlossen werden.such Sensors find as oil level sensors Among other things, in engines, transmissions and hydraulic systems application. Next to the level of the oil and the oil temperature will also be quality data of oil over one electrical interface supplied to a subsequent sensor external control unit, where an evaluation of the measured data takes place. Such an oil condition sensor is also called QLT or oil quality, level and temperature sensor. In such an oil condition sensor For example, the level is detected with a capacitor element. Also for measuring the oil quality, which depends on the dielectric constant of the oil is a capacitor is used. These capacitors are used in known oil condition sensors realized on a sensor tube made of stainless steel. The used Manufacturing processes are very expensive. The known sensor tubes have to also arranged with high installation costs in a corresponding housing and the capacitors must be over consuming Spring contacts are connected.
Es ist daher die Aufgabe der vorliegenden Erfindung, einen Sensor zur kapazitiven Bestimmung von Flüssigkeitsparametern zu schaffen, der besonders einfach hergestellt werden kann.It is therefore the object of the present invention to provide a sensor for Capacitive determination of liquid parameters to create that is particularly easy to manufacture.
Diese Aufgabe ist erfindungsgemäß gelöst durch einen Sensor mit den Merkmalen nach Anspruch 1.These The object is achieved by a sensor having the features of claim 1.
Erfindungsgemäß wurde erkannt, dass die Herstellung des Elektrodenabschnitts und des Verbindungsabschnitts des mindestens einen Sensorkontaktes des Innenkörpers über ein Zweikomponenten-(2K-)Spritzgussverfahren zu einer unaufwendigen und der Massenproduktion zugänglichen Sensorherstellung führt. Auf ein Abdecken der Elektrodenstrukturen mit Masken kann verzichtet werden. Da die Elektrodenabschnitte und die Verbindungsabschnitte im Kunststoffkörper des Innen- und bevorzugt auch des Außenkörpers integriert sind, wird die Anzahl zu montierender Teile minimiert.According to the invention was recognized that the preparation of the electrode portion and the connecting portion the at least one sensor contact of the inner body via a two-component (2K) injection molding process to an inexpensive and accessible to mass production Sensor manufacturing leads. Covering the electrode structures with masks can be dispensed with become. As the electrode sections and the connecting sections in the plastic body the inner and preferably also the outer body are integrated, is minimizes the number of parts to be assembled.
Der Einsatz von PPS-Material nach Anspruch 2 ist aufgrund der guten dielektrischen Eigenschaften dieses Materials in Abhängigkeit von der Temperatur vorteilhaft. Bevorzugt wird ein glasfaserverstärktes PPS-Material, beispielsweise PPS GF 40 %, eingesetzt.Of the Use of PPS material according to claim 2 is due to the good Dielectric properties of this material in dependence advantageous from the temperature. Preference is given to a glass fiber reinforced PPS material, For example, PPS GF 40% used.
LCP-Material nach Anspruch 3 hat für die Oberflächenmetallisierung besonders vorteilhafte Eigenschaften.LCP material according to claim 3 has for the surface metallization particularly advantageous properties.
Diese vorteilhaften Eigenschaften werden durch eine Pd-Dotierung nach Anspruch 4 weiter verbessert.These advantageous properties are by a Pd doping after Claim 4 further improved.
Ein zweischichtiger Aufbau der Metallisierung nach Anspruch 5 hat zur Bildung von Messelektroden besonders geeignete Eigenschaften. Die bevorzugt eingesetzte Ni-Oberfläche schützt die darunter liegende Metallisierungsschicht, bei der es sich insbesondere um eine Kupfermetallisierung handeln kann, des Sensors. Auch bei einem Langzeiteinsatz in Motorenöl über einen großen Temperaturbereich ist dann eine einwandfreie Funktion des Sensors gewährleistet.One two-layer structure of the metallization according to claim 5 has to Formation of measuring electrodes particularly suitable properties. The preferably used Ni surface protects the underlying metallization, which in particular can be a copper metallization of the sensor. Also at a long-term use in engine oil over one huge Temperature range is then a perfect function of the sensor guaranteed.
Mehrere Sensorkontakte nach Anspruch 6 erlauben eine unabhängige kapazitive Bestimmung verschiedener Flüssigkeitsparameter.Several Sensor contacts according to claim 6 allow an independent capacitive Determination of different fluid parameters.
Eine Anordnung der Elektrodenabschnitte und/oder der Verbindungsabschnitte nach Anspruch 7 minimiert kapazitiv parasitäre Begleiteffekte bei der Messdatenerfassung. Diese Begleiteffekte werden ebenfalls verringert, indem bevorzugt möglichst kurze Kontaktstifte zum Einsatz kommen.A Arrangement of the electrode sections and / or the connecting sections according to claim 7 capacitively minimizes parasitic accompanying effects in the measurement data acquisition. These accompanying effects are also reduced by being preferred preferably short contact pins are used.
Eine Kontakthülse nach Anspruch 8 erlaubt eine einfache elektrische Kontaktierung des Kontaktstiftes.A contact sleeve according to claim 8 allows a simple electrical contact of the contact pin.
Ein Einpresskontakt nach Anspruch 9 erlaubt eine elektrische Anbindung der Kontaktstifte, ohne dass ein Lötschritt erforderlich ist.One Press-fit contact according to claim 9 allows an electrical connection the contact pins, without a soldering step is required.
Eine Kontakthülse nach Anspruch 10 kann während des Zweikomponenten-Spritzgussprozesses gleichzeitig mit dem Innenkörper hergestellt werden.A contact sleeve according to claim 10, during of the two-component injection molding process simultaneously with the inner body getting produced.
Ein Kontaktstift nach Anspruch 11 kann im Rahmen des Spritzgussvorganges am Innenkörpers angebracht werden. Ein zusätzlicher Anbringungsschritt entfällt.One Contact pin according to claim 11, in the context of the injection molding process attached to the inner body become. An additional one Attachment step is omitted.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:One embodiment The invention will be explained in more detail with reference to the drawing. In show this:
In
den
Im
Einsatz ist der Innenkörper
Über eine
im Einsatz untenseitige Stirnwand
Der
in
Einstückig angespritzt
am Kontaktstift
Im
eingebauten Zustand liegt der Verbindungsabschnitt
Die
Füllstands-Messelektrode
Am
der unteren Stirnwand
Die
Kontakthülse
Den
Der
Innenkörper
Die Oberflächenmetallisierung der im 2K-Verfahren hergestellten Komponenten kann mehrschichtig sein, wobei zum Beispiel eine Kupfer-Grundschicht vorgesehen ist, auf die eine Nickelschicht aufgetragen ist. Alternativ zu der Nickelschicht kann auch eine Zinnschicht eingesetzt sein.The surface metallization the components produced in the 2K process can be multilayered be provided, for example, a copper base layer is provided on the a nickel layer is applied. Alternative to the nickel layer it is also possible to use a tin layer.
Bei
einer Variante einer elektrischen Anbindung der Kontaktstifte
Der
Sensor zur kapazitiven Bestimmung von Flüssigkeitsparametern mit dem
Innenkörper
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410021523 DE102004021523A1 (en) | 2004-05-03 | 2004-05-03 | Capacitive fluid parameter sensor has electrode and link sections as metallised working areas on injection moulded support |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410021523 DE102004021523A1 (en) | 2004-05-03 | 2004-05-03 | Capacitive fluid parameter sensor has electrode and link sections as metallised working areas on injection moulded support |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102004021523A1 true DE102004021523A1 (en) | 2005-12-08 |
Family
ID=35335818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200410021523 Withdrawn DE102004021523A1 (en) | 2004-05-03 | 2004-05-03 | Capacitive fluid parameter sensor has electrode and link sections as metallised working areas on injection moulded support |
Country Status (1)
Country | Link |
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DE (1) | DE102004021523A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5907278A (en) * | 1996-12-17 | 1999-05-25 | Kavlico Corporation | Capacitive sensor assembly with soot build-up inhibiting coating |
US5929754A (en) * | 1997-12-03 | 1999-07-27 | Kavlico Corporation | High-sensitivity capacitive oil deterioration and level sensor |
DE10100624A1 (en) * | 2000-01-11 | 2001-07-19 | Delphi Tech Inc | Fluid state sensor, e.g. for oil state in vehicle, has sensor tube with coaxial level tube and coaxial reference tube under level tube and electrical circuit connected to tubes to output state signal |
-
2004
- 2004-05-03 DE DE200410021523 patent/DE102004021523A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5907278A (en) * | 1996-12-17 | 1999-05-25 | Kavlico Corporation | Capacitive sensor assembly with soot build-up inhibiting coating |
US5929754A (en) * | 1997-12-03 | 1999-07-27 | Kavlico Corporation | High-sensitivity capacitive oil deterioration and level sensor |
DE10100624A1 (en) * | 2000-01-11 | 2001-07-19 | Delphi Tech Inc | Fluid state sensor, e.g. for oil state in vehicle, has sensor tube with coaxial level tube and coaxial reference tube under level tube and electrical circuit connected to tubes to output state signal |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
R005 | Application deemed withdrawn due to failure to request examination |
Effective date: 20110503 |