EP4193140A1 - Sensor arrangement for determining a quality of a liquid, and method - Google Patents
Sensor arrangement for determining a quality of a liquid, and methodInfo
- Publication number
- EP4193140A1 EP4193140A1 EP21758355.8A EP21758355A EP4193140A1 EP 4193140 A1 EP4193140 A1 EP 4193140A1 EP 21758355 A EP21758355 A EP 21758355A EP 4193140 A1 EP4193140 A1 EP 4193140A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- liquid
- quality
- pins
- conductance
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 2
- 238000011109 contamination Methods 0.000 abstract description 47
- 238000002485 combustion reaction Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000012545 processing Methods 0.000 description 6
- 229910021642 ultra pure water Inorganic materials 0.000 description 6
- 239000012498 ultrapure water Substances 0.000 description 6
- 238000002604 ultrasonography Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000003903 pelvic floor Anatomy 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
-
- 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
- G01N27/226—Construction of measuring vessels; Electrodes therefor
-
- 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
- G01N33/18—Water
- G01N33/1853—Hardness of water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/025—Adding water
- F02M25/03—Adding water into the cylinder or the pre-combustion chamber
Definitions
- the invention relates to a sensor arrangement for determining a quality of a liquid according to the preamble of claim 1 and a method for determining the quality of the liquid using the sensor arrangement.
- water can be injected into a combustion chamber of the internal combustion engine or into an intake tract of the internal combustion engine in order to reduce emissions or fuel consumption of the vehicle.
- Water injection can cool the air in the intake tract if the water is injected into the vehicle's intake tract, or the combustion chamber can be cooled if the water is injected directly into the combustion chamber.
- the evaporating water has a cooling effect and reduces the compression work, which means that less fuel has to be injected, in particular less fuel to cool the combustion engine.
- optical sensors can be used to detect liquids in transparent lines or containers.
- the container or a hose must be transparent and, for example, must not be soiled from the outside.
- the sensor must also be free of dirt at all times.
- the optical sensor can only detect whether liquid is present or whether it is contaminated with foreign particles.
- the quality of the water i.e. the chemical composition, is known. This is not possible with optical sensors.
- a further object of the invention is to provide a simple and inexpensive method for determining the quality of the liquid.
- the object with regard to the sensor arrangement is solved according to the features of claim 1 and the object with regard to the method is solved according to the features of claim 13 .
- a sensor arrangement for determining a quality and/or a degree of contamination of a liquid, such as ultrapure water, in particular in a container.
- the sensor arrangement has at least one conductance sensor configured to determine a conductance of the liquid.
- the conductance is a measure of the ability of the liquid to conduct electricity.
- the conductivity changes as a function of the quality and/or the degree of contamination of the liquid and therefore a determination of the conductivity can provide information about the quality and/or the degree of contamination.
- the sensor arrangement has at least one capacitance sensor. This is configured to determine a capacitance of two measuring bodies in the liquid.
- a permittivity of the liquid whose quality and/or degree of contamination is to be determined by the sensor arrangement can be determined by the capacitance sensor via the capacitance sensor.
- the permittivity of the liquid changes depending on the quality or degree of contamination.
- the sensor arrangement has a computing unit. This is configured to determine the quality and/or the degree of contamination of the liquid, taking into account the measured values of the conductance sensor and the capacitance sensor.
- the processing unit, the quality and / or the degree of contamination of the liquid taking into account the measured conductance of the liquid and the Determine the capacitance of two measuring bodies in the liquid, i.e. the permittivity of the liquid.
- the invention has the advantage that by taking into account the conductance of the liquid and the capacitance of the two measuring bodies in the liquid, it is possible to precisely determine the degree of contamination and/or the quality of the liquid. If, for example, only the measured values of one of the sensors, i.e. either the capacitance sensor or the conductance sensor, were taken into account to determine the quality and/or the degree of contamination, the determination cannot be unambiguous, since, for example, different liquids have similar conductance values or the capacity of two Measuring bodies in different liquids can also be similar. Since the sensor arrangement takes into account both the conductance of the liquid and the capacitance of the measuring body in the liquid, the quality and/or degree of contamination of the liquid can be determined very precisely.
- the sensor arrangement can be arranged in a container, in particular a tank, that contains ultrapure water that is to be injected into an internal combustion engine, for example, and the quality and degree of contamination of the ultrapure water can be precisely determined via the sensor arrangement arranged in the container.
- This can prevent, for example, contaminated ultrapure water from being injected into the internal combustion engine, which can lead to an increase in the service life of the internal combustion engine and fewer defects.
- the chemical composition of the liquid can also be determined by the sensor arrangement. For example, lime or salt or some other chemical compound can be dissolved in the liquid, in particular the ultrapure water. This can be detected by the sensor arrangement, it being thus possible to guarantee that the liquid whose quality and/or degree of contamination is to be measured is suitable for the application for which it is intended.
- the conductance sensor can have two adjacent pins, in particular having a round cross section, which can be used as electrical contacts.
- the pins can be located approximately at a parallel distance from one another.
- a voltage, in particular a constant voltage can be applied to the pins, for example and by measuring the current flowing between the pins, the conductance of the liquid can be determined. It is also possible for a current, in particular a constant current, to flow between the pins and for the voltage present between the pins to be measured.
- the conductance of the liquid can be determined in a simple and cost-effective manner by forming the conductance sensor from the at least two pins.
- the capacitance sensor has two measuring bodies in the liquid whose capacitance can be determined.
- a measuring body of the capacitance sensor can be formed from a component, in particular a metal one, and the other measuring body can be formed from at least one of the pins in a cost-effective manner. Because the capacitance between the, in particular metallic, component and the at least one pin is measured, the sensor arrangement can be very compact, since no further measuring body is required to determine the capacitance between this and the metallic component.
- the component is preferably at least partially made of metal, but it is also conceivable to use another suitable material with which a capacitance can be formed. During the measurement, the component and the pin are at least partially, in particular completely, surrounded by the liquid.
- An electric field can be generated between the pin and the component in order to determine the capacitance of the pin and the component.
- the capacity changes depending on the permittivity of the liquid. This means that the capacity of the pin and the component can change depending on the quality and/or degree of contamination of the liquid. Since only one additional component, in addition to the pin, is necessary to determine the permittivity of the liquid, the quality and/or degree of contamination of the liquid can be determined easily and inexpensively.
- the sensor arrangement can be very compact.
- the component at least partially encloses the pins, which are arranged in particular at a parallel distance from one another, in their longitudinal direction, in particular in the form of a frame.
- the pins extend approximately in the same direction and the component in particular completely frames the pins.
- the component is designed as a wall that extends in the longitudinal direction along the pins. This means the pins are framed by the wall.
- the wall can have at least one recess. This can in particular extend approximately in the longitudinal direction of the pins, ie approximately parallel to the direction in which the pins extend.
- the recess is continuous, ie it can extend over the entire length of the wall approximately in the longitudinal direction of the pins.
- the cutout is designed simply as a slot, for example.
- the wall can additionally have one or more further cut-outs. This is, for example, a hole or a hole in each case.
- the hole or a respective hole can have a round or oval cross-section, for example, and can be arranged in a region of the metal component that is in the vicinity of a housing from which the metal component can project.
- the metallic component has a large number of recesses in this area.
- the sensor arrangement preferably has a level sensor. This is configured to determine a filling level of the liquid in the container in which the sensor arrangement can be arranged.
- the computing unit is configured to determine the quality and/or the degree of contamination of the liquid, taking into account the measured values of the filling level sensor.
- the fill level sensor can be used to determine whether there is liquid in the container and/or whether the liquid completely covers the conductance sensor and the capacitance sensor and/or how high the fill level in the container is. If the liquid level is too low, i.e.
- the filling level sensor can be used to determine whether it is possible to determine the quality and/or the degree of contamination of the liquid, ie it can be determined whether the fill level is sufficient to completely cover the sensors, i.e. the conductance sensor and the capacitance sensor. It would also be conceivable - with a low filling level - if the sensors are not completely covered with liquid, to take this into account when determining the quality/degree of soiling. In this way, the quality/degree of contamination could be determined at any fill level.
- the filling level sensor is an ultrasonic sensor. This emits ultrasonic waves and measures the propagation time of the ultrasonic waves from the filling level sensor to a surface of the liquid, the ultrasonic waves being reflected on the surface of the liquid and being reflected back to the filling level sensor. By measuring the transit time, if a sound transit time in the liquid is approximately known, it can be estimated what the fill level of the liquid in the container is.
- the level sensor of the sensor arrangement is arranged at or adjacent to the capacitance sensor and the conductance sensor, ie that the level sensor is arranged in the liquid, in particular on a bottom of the container.
- the capacitance sensor, the conductance sensor and the filling level sensor can be arranged in one housing and/or are designed as a module.
- the module can be handled individually, for example, so that the sensor arrangement can be easily installed in the container.
- the filling level sensor it is also possible for the filling level sensor to be located outside of the liquid, that is to say, for example, in an area of the container that is not covered with liquid even when the filling level is at its maximum. A sound transit time in air can be known and thus the level of the liquid can be easily determined.
- the filling level sensor can be connected to the processing unit via a cable or a wireless connection.
- the sensor arrangement can be configured to determine a sound propagation time in the liquid via the filling level sensor, which is an ultrasonic sensor, or a further ultrasonic sensor. Since the sound propagation time in the liquid varies depending on the quality and/or degree of contamination of the liquid can change, the computing unit can determine the quality of the liquid and/or the degree of contamination, taking this into account.
- the fill level of the liquid in the container is known.
- the ultrasonic sensor in the liquid can be configured to measure the transit time of the ultrasound from the ultrasonic sensor to the surface of the liquid and back. Since the fill level in the container is known, the sound propagation time can be easily determined, for example by the computing unit. Since the sound propagation time changes depending on a quality and/or the degree of contamination of the liquid, by taking this into account, a determination of the quality and/or the degree of contamination of the liquid can be very precise.
- the sensor arrangement can have at least one temperature sensor. This can be configured to determine the temperature of the liquid.
- the conductance is a strongly temperature-dependent variable. It is therefore advantageous if the quality and/or the degree of contamination of the liquid is determined by the computing unit, taking into account the temperature measured by the temperature sensor. By taking the temperature into account, a measurement of the quality and/or degree of contamination of the liquid can thus be more precise.
- the processing unit determines the quality and/or the degree of contamination of the liquid, taking into account the fill level of the liquid, the capacity of the measuring body in the liquid, the conductance of the liquid, the temperature of the liquid and the sound propagation time in the liquid. By considering all measured variables, it is possible to determine the quality and/or degree of contamination of the liquid very precisely. In particular, these measured values can be recorded continuously in one application.
- the sensor arrangement can have at least one housing and/or be designed as a module, as already mentioned above.
- the conductance sensor and the capacitance sensor can be provided in the housing.
- the housing in particular an interior space of the housing, is preferably cast so that it is watertight or essentially watertight, with the pins and the component protruding at least partially from the housing in order to be surrounded by the liquid.
- the temperature sensor and/or the filling level sensor is/are preferably arranged in the housing in such a way that they preferably do not come into direct contact with the liquid.
- the processing unit can also be present in the housing, but it can also be present outside the sensor arrangement and can be connected to the sensors in the housing, for example, with a cable and/or a wireless connection, such as Bluetooth or WiFi.
- the housing of the sensor which accommodates at least the conductance sensor and the capacitance sensor, at least preferably has an attachment means for attachment to the container that contains the liquid whose quality and/or degree of contamination is to be determined.
- the housing preferably has tabs through which, for example, a screw and/or a pin and/or some other fastening means can be passed in order to fasten the at least one housing of the sensor arrangement.
- the sensor arrangement preferably has at least one printed circuit board. At least the conductance sensor and capacitance sensor can preferably be formed on the circuit board. It would also be conceivable to provide one or more of the additional sensors on the printed circuit board.
- the pins of the conductance sensor and/or the component of the capacitance sensor can extend away from the printed circuit board, in particular in the same direction.
- the temperature sensor and/or the filling level sensor can/can be electrically contacted with the printed circuit board.
- the printed circuit board is preferably arranged in the housing in such a way that no water can penetrate to the printed circuit board.
- a probe of the temperature sensor may also extend away from the circuit board, preferably in the same direction, or about the same direction, as the pins and/or component extend away.
- the housing is simply designed as a shell or bushing that encompasses the printed circuit board.
- the can-shaped housing can have a bottom side that faces a large side of the circuit board. The other major side of the circuit board may face away from the bottom side.
- the printed circuit board can thus be surrounded by a wall of the housing that extends away from the bottom side.
- An interior space of the sleeve-shaped housing, in which the printed circuit board is fastened, is preferably cast in a sealing manner, in particular with a resin.
- the bottom side and/or the wall of the housing can limit the liquid in the container.
- An open side of the can-shaped housing preferably faces away from the liquid.
- The, in particular metallic, component and the measuring bodies in particular in the form of the pins, preferably extend starting from the printed circuit board and penetrate—in particular sealingly—the bottom side. It would be conceivable for a housing projection to extend away from the printed circuit board from the bottom side. A sensor element of the temperature sensor can be provided in the housing projection.
- The, in particular metallic, component of the capacitance sensor is preferably designed to be axially longer than the measuring bodies in order to mechanically protect them from collision with another component, for example during assembly. If the component is designed as a wall, the protection of the pins is further improved.
- An axial length of the pins is preferably less than or equal to the axial length of the wall, so that the pins do not protrude beyond the wall and are therefore better protected.
- the slot in the wall is preferably designed with an approximately rectangular cross section.
- the wall preferably has two, in particular parallel, large sides and two, in particular parallel, small sides.
- the large sides preferably extend parallel to a plane spanned by the pins, with the respective distance to the plane being the same. The lesser sides extend across it.
- a distance between a minor page and the respectively adjacent pin corresponds to the distance between a respective major page and the pins.
- the pins are thus evenly encompassed by the wall.
- the slot referred to above preferably extends through one of the major sides, dividing it into two equal parts. Thus, a distance from the slot to each pin is equal. More preferably is one or are two Holes introduced in a respective large side and a respective small side.
- Longitudinal axes of the holes preferably lie in a common plane, which may extend transversely of the pins.
- the plane is preferably located near or adjacent to the bottom side of the housing, whereby the holes may abut or be located near the bottom side.
- the sensor arrangement can have a further housing in which, for example, the computing unit can be arranged.
- the computing unit preferably has at least one storage medium and/or can be connected to a storage medium.
- Comparative values can be stored on the storage medium, which are necessary, for example, to determine the conductance and/or the capacitance and/or the fill level and/or the sound propagation time.
- the sound propagation time of ultrapure water in particular as a function of the temperature, and/or of other liquids can be stored in the storage medium.
- the quality and/or the degree of contamination of the liquid can be determined, taking the sound transit time into account.
- Capacities of measuring bodies in different liquids ie permittivities of different liquids, in particular depending on the temperature, and/or conductivity values of different liquids, in particular depending on the temperature, can be stored in the storage medium.
- the conductance sensor can determine the conductance of the liquid, preferably continuously, and the capacitance sensor can determine the capacitance of the measuring body in the liquid.
- the measured values can be recorded simultaneously or one after the other or overlapping in time in any order.
- the processing unit can determine the quality and/or the degree of contamination of the liquid based on the measured values of the capacitance sensor and the conductance sensor.
- the quality and/or degree of contamination of the liquid can be determined very precisely by the method.
- the filling level sensor can determine the filling level of the liquid in the container in which the sensor arrangement can be arranged.
- the filling level sensor which can be an ultrasonic sensor, for example, can be used to detect whether there is liquid in the container and whether the liquid in particular completely covers or surrounds the pins of the conductance sensor and/or the measuring body of the capacitance sensor.
- the computing unit can thus determine the quality and/or the degree of contamination of the liquid, taking into account the filling level.
- the temperature of the liquid can be determined by the temperature sensor in the method, since, for example, the conductance of the liquid and/or the permittivity of the liquid can be dependent on the temperature of the liquid.
- the conductance of the liquid and/or the permittivity of the liquid can be dependent on the temperature of the liquid.
- the ultrasonic sensor for determining the transit time of sound can determine a transit time of sound in the liquid. Since this also depends on the degree of contamination and/or the quality of the liquid, the quality of the liquid and/or the degree of contamination of the liquid can be determined more precisely by the computing unit, taking into account the sound propagation time.
- the conductivity of the liquid, the capacitance of the measuring body in the liquid and/or the level of the liquid and/or the temperature of the liquid and/or the sound propagation time in the liquid can be measured in any order or simultaneously.
- a sensor arrangement for determining a quality and/or degree of contamination of a liquid, in particular in a container.
- the sensor arrangement has at least one conductivity sensor, which is configured to determine a conductivity of the liquid, and at least one capacitance sensor, which is configured to a capacitance of two measuring bodies in the determine liquid.
- the sensor arrangement has at least one computing unit. This is configured to determine the quality and/or the degree of contamination of the liquid, taking into account the measured values of the conductance sensor and the capacitance sensor. Furthermore, a method for determining the quality of the liquid using the sensor arrangement is provided.
- FIG. 1 shows a perspective view of a sensor arrangement according to an exemplary embodiment
- FIG. 3 shows a sequence of a method for determining a quality and/or a degree of contamination of a liquid.
- the sensor arrangement 1 shows a sensor arrangement 1, which has a housing 2, in which an ultrasonic sensor, which is not shown, a conductance sensor 4, a capacitance sensor 6 and a temperature sensor, which is also not shown, are accommodated. Furthermore, the sensor arrangement 1 has a computing unit 8 which, for example, can be connected wirelessly, for example via Bluetooth, and/or with a cable and/or via a printed circuit board, which is explained in more detail in FIG are, is connectable.
- the processing unit 8 can be arranged both inside and outside of the container 12 . In this exemplary embodiment, the arithmetic unit 8 is arranged outside of the container 12 .
- the ultrasonic sensor which is not shown here and which can be designed to determine a filling level in the container 12 or a sound propagation time of the liquid that is in the container 12, is accommodated in the housing 2 in an area A of the housing 2.
- the housing 2 has in the area A, in which the ultrasonic sensor is accommodated, a recess 14 in the area is provided where the ultrasonic sensor is arranged, which is explained in more detail below with reference to FIG.
- the recess 14 is designed as a basin.
- a pelvic floor serves as a wall between the ultrasonic sensor, not shown, and the liquid.
- the ultrasonic sensor is completely accommodated in the housing 2 and is arranged on a side of the housing 2 pointing away from the recess 14 .
- the cutout 16 leads to improved mechanical stability of the housing 2.
- the ultrasound emitted by the ultrasound sensor can be emitted into the liquid via the pelvic floor. Furthermore, it is conceivable that the ultrasound is directed or guided through the recess 14 so that a measurement can be more accurate.
- the conductance sensor 4 and the capacitance sensor 6 are arranged in a further area B of the housing 2, which is arranged adjacent to the area A of the housing 2, the conductance sensor 4 and the capacitance sensor 6 are arranged.
- the pins 18 are arranged parallel to one another, next to one another.
- a conductance measurement a voltage is applied to the pins 18 and a current flowing between the pins 18 is measured.
- the conductance of the liquid can change and thus a current that flows between the pins 18 .
- the pins 18 are framed by a wall of a metallic component 20, the metallic component 20 extending in the same direction as the pins 18.
- the wall has a recess 22 which extends approximately in the longitudinal direction of the pins 18, ie parallel to the extension direction of the pins 18 extends.
- the recess 22 extends in the longitudinal direction of the pins over the entire length of the wall of the metallic component 20. This means that the wall of the metallic component 20 has a gap and does not completely enclose the pins 18.
- the pins 18 are also arranged approximately in the middle of the metal component.
- the metallic component 20 additionally has further round recesses 24 which are formed in an area of the metallic component 20 which is in the vicinity of the housing 2 .
- a voltage can be applied to the metallic component 20 and to at least one of the pins 18 and the capacitance between the pin 18 and the metallic component 20 can be determined.
- the capacitance sensor 6 has two measuring bodies whose capacitance is to be determined, and one of the measuring bodies is the metallic component 20 and another measuring body is one of the pins 18.
- the capacitance sensor 6 and the conductance sensor 4 thus form a very compact sensor unit, with which can be used to determine the conductance of the liquid and also a capacitance of measuring bodies in the liquid.
- the housing has a further area C, in which a temperature sensor, which is not shown here, is arranged. Area C connects to area B.
- the housing 2 has a cup-shaped projection 26 extending away from the housing 2 . At least part of the temperature sensor can be arranged in this. The temperature sensor thus extends within the projection 26 which may be completely surrounded by the liquid in the container 12. A temperature of the liquid can thus be reliably determined.
- the housing 2 has at least one tab 28 which can be provided for fastening the housing 2 to the container 12 .
- a screw or a pin that can be fastened in the container 12 can be guided through the tab 28 .
- the housing 2 can be easily attached to the container.
- the computing unit 8 can determine a quality or degree of contamination of the liquid in the container 12 taking into account the measured values of the ultrasonic sensor and the temperature sensor, both of which are not shown, and the capacitance sensor 6 and the conductance sensor 4 .
- the measured values determined by the sensors change depending on the chemical composition, and thus a quality and/or degree of contamination of the liquid in the container can be determined most precisely and reliably.
- Comparative values that the computing unit 8 can use to compare with the measurement results of the sensors 4, 6, the ultrasonic sensor and the temperature sensor can be stored in a storage medium 29 which is integrated in the computing unit 8 in this exemplary embodiment.
- Fig. 2 the sensor arrangement 1 with the housing 2 and the conductance sensor 4 and the capacitance sensor 6 is shown. It can be seen that the pins 18 of the conductance sensor 4 extend away from a printed circuit board 30 .
- the pins 18 are connected to the circuit board 30 with two contacts 32 .
- the contacts 32 each also have a round cross section, which is somewhat smaller than the cross section of the pins 18.
- the pins 18 are each arranged coaxially with the respective contact 32.
- the metallic component 20 encloses the pins 18, the pins 18 being arranged approximately in the middle of the wall of the metallic component 20.
- the pins 18 and the metallic component 20 are completely surrounded or encapsulated in a region which is accommodated in the housing 2 by the material from which the housing 2 is cast.
- the pins 18 and the metal component 20 protrude from the housing 2 to a greater extent than is cast in the housing 2 over their entire length.
- the wall of the metallic component 20 does not protrude from the printed circuit board 30 but is at a distance from the printed circuit board 30 .
- the metallic component 20 cantilevers approximately from a section in a longitudinal direction of the pins 18 where the contacts 32 are connected to the respective pin 18 .
- the pins 18 are shown in electrical contact with the circuit board 30 .
- the metallic component 20 is preferably also electrically connected to the printed circuit board 30 .
- the ultrasonic sensor 34 is shown, which is also contacted with the printed circuit board 30 .
- the filling level of the liquid in the container 12, see FIG. 1, can be determined via the ultrasonic sensor 34 .
- a sound propagation time in the liquid can be determined via the ultrasonic sensor 34 .
- the temperature sensor 36 is shown, which also protrudes from the printed circuit board 30 in the same direction as the pins 18 . The temperature sensor 36 protrudes into the protrusion 26, which is cup-shaped, and since the protrusion 26 is completely surrounded by the liquid in the container 12 can be, the temperature can be reliably determined via the temperature sensor 36 .
- FIG. 3 shows a flow chart of a method for determining a quality and/or a degree of contamination of a liquid.
- the conductance of the liquid can be determined via the conductance sensor 4, see FIG.
- a capacitance of measuring bodies in the liquid can be determined using the capacitance sensor 6, see FIG.
- the measuring bodies can be, for example, one of the pins 18 of the conductance sensor 4 and the metallic component 20, see Fig. 2.
- the temperature of the liquid in the container 12, see Fig. 1 can be measured via the temperature sensor 36, see 2, to be measured.
- the filling level of the liquid in the container 12 can be determined, for example via the ultrasonic sensor 34, see FIG. It is possible that in a further step 46, for example by the ultrasonic sensor 34, the sound propagation time in the liquid is determined. Steps 38, 40, 42, 44, 46 can be carried out simultaneously or sequentially, the order being arbitrary and, for example, at least two of the steps being carried out simultaneously. In particular, the steps are carried out continuously.
- the measurement results recorded in steps 38 to 46 are then forwarded wirelessly and/or via a cable to the computing unit 8, and in a further step 48 this can check the quality and/or the degree of contamination of the liquid in the container 12, see Fig. 1 , determine.
- Sensor arrangement 1 housing 2 conductance sensor 4 capacitance sensor 6 computing unit 8 container 12 wall 14 recess 16 pin 18 component 20 recess 22, 24 projection 26 tab 28 storage medium 29 printed circuit board 30 contact 32 ultrasonic sensor 34
- Temperature sensor 36 step 38, 40, 42, 44, 46, 48
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- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (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 |
---|---|---|---|
DE102020120921.5A DE102020120921A1 (en) | 2020-08-07 | 2020-08-07 | Sensor arrangement for determining a quality of a liquid and method |
PCT/EP2021/071908 WO2022029244A1 (en) | 2020-08-07 | 2021-08-05 | Sensor arrangement for determining a quality of a liquid, and method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4193140A1 true EP4193140A1 (en) | 2023-06-14 |
Family
ID=77431287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21758355.8A Pending EP4193140A1 (en) | 2020-08-07 | 2021-08-05 | Sensor arrangement for determining a quality of a liquid, and method |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4193140A1 (en) |
DE (1) | DE102020120921A1 (en) |
WO (1) | WO2022029244A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU102872B1 (en) * | 2021-11-08 | 2023-05-11 | Stratec Se | Sensor system for fluids |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE59008731D1 (en) | 1990-08-30 | 1995-04-20 | Siemens Ag | Device for determining the alcohol content or the calorific value of a mixture. |
NL1005421C2 (en) | 1997-03-03 | 1998-09-18 | Meridian Instr Bv | Improved device for measuring the quality of a fluid in a vessel. |
DE19842484A1 (en) * | 1998-09-16 | 1999-12-02 | Siemens Ag | Contents gauge for storage vessel, e.g. containing exhaust emission treatment solution used in heavy goods vehicle |
DE102008020119B4 (en) | 2007-04-27 | 2014-06-12 | Ust Umweltsensortechnik Gmbh | Device for determining the alcohol content of a mixture |
DE202012000569U1 (en) | 2012-01-20 | 2013-04-23 | Seuffer Gmbh & Co.Kg | Sensor device for detecting liquid properties |
DE102016212986A1 (en) * | 2016-07-15 | 2018-01-18 | Volkswagen Aktiengesellschaft | Liquid measuring device and measuring head device for moisture detection, in particular in containers for liquid-sensitive electrical and / or electronic components in road vehicles |
DE102017200291A1 (en) * | 2017-01-10 | 2018-07-12 | Robert Bosch Gmbh | Water injection device, in particular an internal combustion engine, and method for operating such a water injection device |
DE102017215214B4 (en) | 2017-08-31 | 2024-04-11 | Vitesco Technologies Germany Gmbh | Device for determining a fluid level and a quality of a fluid |
US11802863B2 (en) | 2018-01-31 | 2023-10-31 | Nippon Pillar Packing Co., Ltd. | Oil condition determination system, oil condition determination method, and oil condition determination program |
US11021950B2 (en) | 2019-06-06 | 2021-06-01 | Probe Technology Services, Inc. | Production-logging sensor |
CN111175375A (en) * | 2020-01-17 | 2020-05-19 | 上海联芊电子科技有限公司 | Liquid detection device, containing box, equipment and detection method |
CN112432975B (en) * | 2021-01-26 | 2021-04-09 | 南京壹净新材料科技有限公司 | Method for measuring liquid conductivity |
-
2020
- 2020-08-07 DE DE102020120921.5A patent/DE102020120921A1/en active Pending
-
2021
- 2021-08-05 WO PCT/EP2021/071908 patent/WO2022029244A1/en unknown
- 2021-08-05 EP EP21758355.8A patent/EP4193140A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2022029244A1 (en) | 2022-02-10 |
DE102020120921A1 (en) | 2022-02-10 |
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