EP3887776A1 - Dispositif de detection du niveau minimal d'un fluide imprime dans un reservoir - Google Patents
Dispositif de detection du niveau minimal d'un fluide imprime dans un reservoirInfo
- Publication number
- EP3887776A1 EP3887776A1 EP19820833.2A EP19820833A EP3887776A1 EP 3887776 A1 EP3887776 A1 EP 3887776A1 EP 19820833 A EP19820833 A EP 19820833A EP 3887776 A1 EP3887776 A1 EP 3887776A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- fluid
- filling
- reservoir
- threshold
- 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- Withdrawn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
- G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/265—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels
-
- 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
- G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
-
- 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
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
Definitions
- the present invention relates to a device comprising a printed sensor for detecting the minimum level of a fluid in a tank of a motor vehicle.
- a motor vehicle comprises different types of tanks, in particular so-called insulating tanks such as the tanks for the windscreen washer, the brake fluid, the cooling and the power steering.
- the detection of a minimum level inside a tank consists in using electromechanical sensors inserted in the tank and brought into contact with the liquid present.
- electromechanical sensors inserted in the tank and brought into contact with the liquid present.
- Such use requires perfect sealing of the tank and operation essentially with tanks with rigid walls, resulting in a strong dependence on the inclinations of the vehicle, in particular on slopes and turns.
- patent document EP1956349B1 describes a system for detecting the level of a fluid inside a tank using a probe immersed in the fluid and comprising the measurement of an electromagnetic reference signal subsequently compared with another measurement point in order to overcome temperature variations for the measurement of a level in the tank.
- the present invention relates to a device for detecting a threshold for filling a fluid in a tank of a motor vehicle, comprising an electronic module and a capacitive printed measurement sensor disposed in the tank, said printed sensor comprising at least two measurement zones corresponding to different filling levels of the reservoir, said at least two measurement zones comprising a first pattern under said filling threshold and a second pattern at said filling threshold, said capacitive printed sensor being configured to measure a first frequency at said first pattern and a second frequency at said second pattern, said electronic module being configured to compare said first frequency and said second frequency and determine if the filling threshold is reached.
- the first and second frequencies are measured continuously.
- the capacitive printed sensor has an interdigital comb shape or a geometric shape comprising two contiguous tracks.
- the capacitive printed sensor is printed on the periphery of the internal surface of the tank or is printed on a self-adhesive surface glued on the periphery of the internal surface of the tank.
- the capacitive printed sensor comprises conductive inks, said conductive inks comprising a metal salt or a combination of metal salts from the following metal salts: graphene, carbon, silver, copper.
- the first and second patterns are respectively coupled to electronic means for contactless acquisition of the measurements of the first and of the second frequencies.
- the present invention also relates to a method for detecting a threshold for filling a fluid in a reservoir by means of a detection device as briefly described above, comprising an electronic module and a capacitive printed sensor, said capacitive printed sensor being configured to measure a first frequency at the first pattern of a first measurement area below said filling threshold and for measuring a second frequency at the second pattern of a second measurement area at said filling threshold, said method comprising: determining a reference frequency directly dependent on the filling level of the fluid in the reservoir when the reservoir is empty serving as a calibration point in the frequency measurement,
- the method comprises determining that the reservoir is empty.
- the first frequency is less than the second frequency, determining that the level of the fluid exceeds the first pattern.
- the determination that the level of the fluid exceeds the second pattern if the second frequency becomes identical to the first frequency and is distinct from the reference frequency, the determination that the level of the fluid exceeds the second pattern.
- the invention also relates to a motor vehicle comprising a device for detecting the filling level of a fluid in a tank as briefly described above.
- FIG. 1 shows a diagram of the device of the invention.
- FIG. 2 shows a diagram of the device in a tank.
- FIG. 3 represents a diagram showing the evolution of the frequencies as a function of the level of liquid in the reservoir.
- the device comprises in [Fig. 1] the diagram of a reservoir 1 containing a fluid and comprising a capacitive printed sensor 2 for detecting the fluid filling threshold in the reservoir 1 according to the invention.
- the capacitive printed sensor 2 according to the invention is printed directly on the periphery of the reservoir 1, it includes a first measurement zone 3 comprising a first pattern 4 below the fluid filling threshold, a second measurement zone 5 comprising a second pattern 6 at the fluid filling threshold, as well as a common measurement area 7 located between the first pattern 4 and the second pattern 6.
- the permanent comparison of the measurements of the first frequency 16, at the level of the first measurement zone 3, and of the second frequency 17, at the level of the second measurement zone 5, makes it possible to detect whether the fluid filling threshold at the second reason 6 is reached.
- the reduced distance between the patterns 4 and 6 of the printed capacitive sensor 2 makes it possible to accurately detect the level of fluid reached in the reservoir 1. In fact, the first pattern 4 being constantly immersed in the fluid, as soon as the fluid reaches the second reason 6, the difference between the frequency measurements of the two zones, 3 and 5, is canceled, making it possible to deduce therefrom the level of the liquid in the reservoir 1.
- the determination of the first and the second frequency is carried out by means of an electronic module 9 comprising an integrated logic circuit comprising a first capacitor having a first capacitance and a first resistance, linked to the first measurement zone 3, as well as a second capacitor having a second capacity and a second resistance, identical to the first resistance, linked to the second measurement zone 5.
- an electronic module 9 comprising an integrated logic circuit comprising a first capacitor having a first capacitance and a first resistance, linked to the first measurement zone 3, as well as a second capacitor having a second capacity and a second resistance, identical to the first resistance, linked to the second measurement zone 5.
- the capacity of a capacitor increases.
- the detection of the variation in capacitance between the first and the second capacitor of the capacitive printed sensor 2 is carried out by means of measurements of the frequency of a signal passing through each of the capacitors.
- printed capacitive sensors are implemented and are connected to said electronic module 9.
- FIG. 2 represents the capacitive printed sensor 2 printed on the periphery of the tank 1.
- the electronic module 9 of the capacitive printed sensor 2 is connected directly to the first measurement zone 3, to the second measurement zone 5 and to the common measurement zone 7, by physical contact by means of connectors 10.
- FIG. 3 shows a diagram showing the evolution of the first frequency 16 and the second frequency 17 measured as a function of the level of the fluid 12 reached, the empty reservoir 1 1 serving as a reference.
- the frequency 15 of the empty reservoir 11 As shown in [Fig. 3], originally, that is to say in the case of an initially empty reservoir 11: the frequency 15 of the empty reservoir 11, the first frequency 16 of the first measurement zone 3 and the second frequency 17 of the second measurement zone 5 are identical.
- the frequency 15 of the empty tank 11 being considered as a reference frequency serving as a calibration point for calibrating and correcting inaccuracies linked to possible temperature variations in the fluid.
- the first frequency remains the same until the fluid filling the reservoir 1 reaches the first pattern 4.
- the first frequency 16 decreases while the second frequency 17 remains unchanged and equal to the empty frequency 15.
- the second frequency 17 is then greater than the first frequency 16.
- the first frequency 16 no longer varies and is less than the second frequency 17.
- the second frequency 17 decreases to reach the same value as the first frequency 16.
- the present invention makes it possible to determine whether the filling threshold corresponding to the second pattern 6 is reached.
- the fluid filling threshold is detected and the second frequency 17 increases while the first frequency 16 remains the same.
- the second frequency 17 is equal to the first frequency
- the sensor 2 is printed on a self-adhesive surface, for example a label, in order to be then glued and used on any reservoir requiring a control of the level of fluid. Thanks to the fluid level detection sensor according to the invention, the detection of a level where the tank is empty is also possible, making it possible to avoid the operation of a vacuum pump.
- the sensor according to the invention prints on any type of surface, whatever its geometry or the material which constitutes it, moreover it does not need to be in contact with the fluid, reducing the risk of leakage of the fluid. Finally, the sensor is intrinsically stable and can be used with any type of fluid.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (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 |
---|---|---|---|
FR1872077A FR3089289B1 (fr) | 2018-11-29 | 2018-11-29 | Dispositif de détection du niveau minimal d’un fluide imprimé dans un réservoir |
PCT/FR2019/052651 WO2020109687A1 (fr) | 2018-11-29 | 2019-11-07 | Dispositif de detection du niveau minimal d'un fluide imprime dans un reservoir |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3887776A1 true EP3887776A1 (fr) | 2021-10-06 |
Family
ID=66049286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19820833.2A Withdrawn EP3887776A1 (fr) | 2018-11-29 | 2019-11-07 | Dispositif de detection du niveau minimal d'un fluide imprime dans un reservoir |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3887776A1 (fr) |
FR (1) | FR3089289B1 (fr) |
WO (1) | WO2020109687A1 (fr) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19949985C2 (de) * | 1999-10-15 | 2001-08-16 | Sie Sensorik Ind Elektronik Gm | Kapazitiver Sensor zur Detektion des Füllstandes eines Mediums in einem Behälter |
KR100794125B1 (ko) * | 2006-07-27 | 2008-01-10 | 웅진코웨이주식회사 | 비접촉식 수위 제어 장치 |
DE102007007407A1 (de) | 2007-02-12 | 2008-08-21 | Krohne S.A. | Füllstandsschalter und Verfahren zur Erfassung des Füllzustands eines in einem Behälter vorgesehenen Mediums |
FR2934064A1 (fr) * | 2008-07-18 | 2010-01-22 | Systemes Electroniques De Mesu | Detecteur conditionneur miniature pour regulation de niveau |
US8966973B1 (en) * | 2011-02-15 | 2015-03-03 | Christopher J. Milone | Low cost capacitive liquid level sensor |
US8590375B2 (en) * | 2011-03-22 | 2013-11-26 | Rochester Gauges, Inc. | Self-calibrating capacitive liquid level sensor assembly and method |
WO2015019335A1 (fr) * | 2013-08-09 | 2015-02-12 | Zodiac Cabin Controls Gmbh | Système de capteur de niveau de liquide de robinet de commande d'eaux grises |
FR3034864A1 (fr) * | 2015-04-08 | 2016-10-14 | Inergy Automotive Systems Res (Societe Anonyme) | Dispositif de mesure de niveau d'un liquide |
-
2018
- 2018-11-29 FR FR1872077A patent/FR3089289B1/fr not_active Expired - Fee Related
-
2019
- 2019-11-07 WO PCT/FR2019/052651 patent/WO2020109687A1/fr unknown
- 2019-11-07 EP EP19820833.2A patent/EP3887776A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
FR3089289B1 (fr) | 2020-11-06 |
WO2020109687A1 (fr) | 2020-06-04 |
FR3089289A1 (fr) | 2020-06-05 |
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