EP3568673A1 - Füllstandsensor zur detektierung eines füllstandes einer flüssigkeit - Google Patents
Füllstandsensor zur detektierung eines füllstandes einer flüssigkeitInfo
- Publication number
- EP3568673A1 EP3568673A1 EP17784644.1A EP17784644A EP3568673A1 EP 3568673 A1 EP3568673 A1 EP 3568673A1 EP 17784644 A EP17784644 A EP 17784644A EP 3568673 A1 EP3568673 A1 EP 3568673A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insulation
- level sensor
- contacts
- liquid
- electrically conductive
- 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- Withdrawn
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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
-
- 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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
Definitions
- the invention relates to a fill level sensor for detecting a fill level of a liquid which can be stored in a tank, wherein the tank is filled with air above the liquid, and wherein the fill level sensor has at least two electrically conductive contacts, between which a Dependence of a contact with the liquid and / or the air adjusting the electrical resistance is.
- Such a level sensor is known from DE 10 2011 112 326 AI.
- This fill level sensor for detecting a fill level of a liquid which can be stored in a tank in the form of a reducing agent can be realized in the manner of electrical conductors and / or electrical contacts. The measurement of the level can be determined via an electrical resistance and / or an electrical capacitance. The electrical resistance and / or the electrical capacitance between the two electrical contacts and / or two electrical conductors changes depending on whether or not reducing agent is present at / between the contacts or at / between the conductors. This effect is used for level determination.
- Tank storable liquid is known from DE 10 2010 062 985 AI.
- This level sensor is designed for an exhaust aftertreatment system wherein the fluid is a reductant stored in the tank.
- the level sensor is installed on a fluid extraction module that is inserted into the tank from below.
- the fluid extraction module has a Insert on which is made of high density polyethylene (HDPE) and is designed with a plug-in connection for connection of secondary lines.
- the invention has for its object to provide a level sensor for
- each of the contacts is surrounded by insulation.
- This embodiment is based on the finding that in previous embodiments, the contacts are at least partially exposed to ensure the function of a change in electrical resistance upon contact with the liquid.
- the fact that now the contacts are surrounded by insulation it is ensured in any case that the problem described above no longer exists.
- the insulation thus first of all ensures that no liquid can penetrate into the secondary parts of the level sensor.
- the insulation is an electrically conductive
- Insulation or electrically non-conductive insulation As a result, in addition to the protection against ingress of liquid into the secondary parts of the level sensor, it is also possible to influence the self-adjusting resistance between the contacts.
- the electrically conductive insulation and / or electrically non-conductive insulation is formed differently on the pins.
- one of the electrically conductive insulations along the entire freestanding length can be formed as conductive (reference contact).
- the other contact defines by its properties the height to be detected the liquid. This can be adjusted by the fact that the insulation is conductive only from a defined height.
- This embodiment allows a further influence on the self-adjusting between the contacts electrical resistance. For example, a warning threshold and then a switching threshold can then be set up first.
- the electrical resistance in the context of the invention is expressly dependent on the neutral isolated influence on the contacts and / or non-neutral isolated influence (as described above) on the contacts through the liquid and / or the air.
- the insulation along at least one contact has a changing diameter (thickness).
- Embodiment for example, with a maximum thickness of the insulation of 6 mm to 0.5 mm, the same advantage described above can be achieved.
- the contacts pins or busbars can be easily surrounded by an electrically conductive or non-conductive insulation, according to the embodiments described above.
- the material of the contacts is stainless steel. This embodiment has proved to be particularly advantageous.
- HDPE Polyethylene plastic
- the polyethylene plastic (HDPE) on a conductive filler With such a filler, the degree of electrical conductivity of the
- Isolation can be set exactly.
- the material reaches a specific conductivity of the order of 1 ohm per centimeter to 10 ohms per centimeter.
- Polyethylene plastic without problems with polyethylene without a filler without problems, for example, by welding or repeated spraying (2 K injection molding) are connected.
- the contacts are connected to signal lines. This connection can be made via appropriate plug contacts, and the signal lines can be connected to other signal lines
- Insulation ensures that no liquid can creep into the signal lines and / or the wiring harness.
- a resistor is electrically connected between two contacts and / or further signal lines.
- a defined resistance for example of the order of several kilohms, makes it possible to distinguish between a contact lying on "air" and a defective level sensor, for example by a disconnected plug, in which case the resistance becomes much greater Electrical diagnosis of the level sensor is possible
- the electrical resistance is arranged directly in the region of the contacts, but can also be elsewhere
- Level sensor installed on a tank for storing a reducing agent for an exhaust aftertreatment system of an internal combustion engine.
- the level sensor is designed so that a signal is triggered when the level of the reducing agent in the tank drops below a predetermined level. Based on the triggered signal, the driver of the vehicle in which the internal combustion engine is installed, at a low level
- Figure 1 shows a first embodiment of an inventive design
- Figure 2 shows a second embodiment of an inventive
- the level sensor 1 shown in Figure 1 has two stainless steel existing contacts 2a, 2b, which are formed for example as pins or busbar.
- the contacts 2 a, 2 b are cast in a base plate 3 and protrude from the base plate 3 by a predetermined amount.
- the base plate 3 may for example be installed in a liquid extraction module, which in addition to the level sensor 1 still includes a pump, a filter and a heater and / or other components.
- the base plate may for example be made of polyethylene plastic (HDPE).
- the level sensor 1 with the liquid extraction module is preferably installed from below into a corresponding receiving opening in a tank which stores a liquid in the form of a reducing agent.
- the reducing agent for example, an aqueous solution of urea, is conveyed by the pump to an exhaust aftertreatment system, which depends on
- reducing agent via, for example, an injector in an exhaust pipe of the internal combustion engine.
- the reducing agent mixes in the
- HDPE Polyethylene plastic
- Length division can be divided differently within the scope of the invention. This refinement makes it possible to achieve a defined fill level 5 of
- Insulation 4c emerges from the reducing agent and then air is present between the upper part of the insulation 4a and the insulation 4c.
- the level sensor 1 may also have other contacts, moreover
- non-conductive insulation are provided. This can be a graduated
- Detection of a level of the reducing agent can be determined. It is also conceivable to completely omit the contacts 2a, 2b and to form the level sensor 1 with respect to the level of fill to be determined by pin-shaped insulation 4a, 4c. Of course, it must be ensured that in the area of the insulation 4b a conductive connection of the conductive insulation
- the base plate 3 has an angle-shaped connection 6 in the lower region, in which further signal lines 7a, 7b are connected to the contacts 2a, 2b. Between the signal lines 7a, 7b is a defined
- Resistor 8 in the form of a parallel resistor, for example in the
- the resistor 8 can also be connected directly to the contacts 2a, 2b in the region of the base plate 3.
- the signal lines 7a, 7b are connected to the aforementioned electronic control unit for evaluation and further processing of the detected signals connected. In particular, at a determined level less than / equal to the level height 5 is a signal to request refilling
- the exemplary embodiment according to FIG. 2 is basically configured similarly to that of FIG. 1, the contacts 2 a, 2 b being arranged here in a carrier plate 9.
- the support plate 9 is in the illustrated
- the base plate 9 can also be made of polyethylene material without filler, which is electrically insulating. This support plate 9 is sealed to a base plate 3a, for example, welded.
- the contacts 2a, 2b are in the region of the compound of
- Support plate 9 to the base plate 3a with continuing signal lines 7a, 7b, for example, by plug contacts 10a, 10b.
- the further construction of the base plate 3a with the connection 6 is as described under FIG.
- the protruding from the support plate 9 contact 2a is formed as in Figure 1 and provided with a total of (thin) conductive insulation 4a over its entire height.
- the contact 4b has a stepped
- Insulation 4d, 4e which up to about% of the height of the contact 2b has a much larger diameter (4d) than in the upper region (4e).
- the insulation 4d with the larger diameter in principle, as well as the insulation 4e with the smaller diameter is electrically conductive, is given by the diameter jump in the upper region of the same effect as in the insulation 4b, 4c of Figure 1.
- the measurable electrical resistance between the contacts 2a, 2b changes when the contact 2b with the insulation 4e emerges from the reducing agent and then air is applied between the upper part of the insulation 4a and the insulation 4e.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017200277.8A DE102017200277A1 (de) | 2017-01-10 | 2017-01-10 | Füllstandsensor zur Detektierung eines Füllstandes einer Flüssigkeit |
PCT/EP2017/076404 WO2018130318A1 (de) | 2017-01-10 | 2017-10-17 | Füllstandsensor zur detektierung eines füllstandes einer flüssigkeit |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3568673A1 true EP3568673A1 (de) | 2019-11-20 |
Family
ID=60117688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17784644.1A Withdrawn EP3568673A1 (de) | 2017-01-10 | 2017-10-17 | Füllstandsensor zur detektierung eines füllstandes einer flüssigkeit |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3568673A1 (de) |
CN (1) | CN110494719A (de) |
DE (1) | DE102017200277A1 (de) |
WO (1) | WO2018130318A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021107099A1 (de) | 2021-03-23 | 2022-09-29 | Bayerische Motoren Werke Aktiengesellschaft | Sensoreinrichtung mit Zwei-Pin-Sensor zur Überwachung eines Flüssigkeitsfüllstands, Vorrichtung sowie Kraftfahrzeug |
DE102022209515A1 (de) | 2022-09-12 | 2024-03-14 | Knipping Kunststofftechnik Gessmann Gmbh | Füllstandmesssensor |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3696362A (en) * | 1970-09-14 | 1972-10-03 | Dual Lite Co | Low electrolyte level alarm devices |
JP3402758B2 (ja) * | 1994-05-30 | 2003-05-06 | 日星電気株式会社 | センサー |
DE19603093C2 (de) * | 1996-01-29 | 1999-12-16 | Fraunhofer Ges Forschung | Stabförmige Elektrode mit einer Korrosionsschutzschicht und Verfahren zur Herstellung derselben |
DE10047594A1 (de) * | 2000-09-26 | 2002-04-18 | Siemens Ag | Verfahren und Vorrichtung zum Bestimmen des Füllstandes einer Flüssigkeit in einem Behälter |
CN2519903Y (zh) * | 2001-12-28 | 2002-11-06 | 王晓峰 | 液位传感器 |
JP2005241475A (ja) * | 2004-02-26 | 2005-09-08 | Nissei Electric Co Ltd | 液面センサ |
EP1632757A1 (de) * | 2004-09-06 | 2006-03-08 | Tecan Trading AG | Stabförmiges Element zum Detektieren eines Flüssigkeitsniveaus und entsprechende Vorrichtung zum Detektieren eines Flüssigkeitsniveaus |
DE102009030674A1 (de) * | 2009-06-26 | 2010-12-30 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Entnahmerohr für einen Tank und Verfahren zu dessen Herstellung |
DE102010062985A1 (de) | 2010-12-14 | 2012-04-19 | Robert Bosch Gmbh | Flüssigkeitsentnahmemodul, Flüssigkeitstank |
US9038455B2 (en) * | 2011-06-21 | 2015-05-26 | Delaware Capital Formation, Inc. | System and method for product level monitoring in a chemical dispensing system |
DE102011112326A1 (de) | 2011-09-02 | 2013-03-07 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Vorrichtung zur Bereitstellung von flüssigem Reduktionsmittel mit einem Partikelsieb |
-
2017
- 2017-01-10 DE DE102017200277.8A patent/DE102017200277A1/de not_active Withdrawn
- 2017-10-17 WO PCT/EP2017/076404 patent/WO2018130318A1/de unknown
- 2017-10-17 CN CN201780082972.1A patent/CN110494719A/zh active Pending
- 2017-10-17 EP EP17784644.1A patent/EP3568673A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CN110494719A (zh) | 2019-11-22 |
DE102017200277A1 (de) | 2018-07-12 |
WO2018130318A1 (de) | 2018-07-19 |
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