WO2019105774A1 - Capteur ultrasonique, unité intégrée à un réservoir équipée d'un capteur ultrasonique - Google Patents

Capteur ultrasonique, unité intégrée à un réservoir équipée d'un capteur ultrasonique Download PDF

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Publication number
WO2019105774A1
WO2019105774A1 PCT/EP2018/081666 EP2018081666W WO2019105774A1 WO 2019105774 A1 WO2019105774 A1 WO 2019105774A1 EP 2018081666 W EP2018081666 W EP 2018081666W WO 2019105774 A1 WO2019105774 A1 WO 2019105774A1
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WO
WIPO (PCT)
Prior art keywords
ultrasonic sensor
reflector
sensor
housing part
unit
Prior art date
Application number
PCT/EP2018/081666
Other languages
German (de)
English (en)
Inventor
Ewgenij Landes
Steffen Schott
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2019105774A1 publication Critical patent/WO2019105774A1/fr

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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
    • G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
    • G01N29/326—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise compensating for temperature variations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/12—Other sensor principles, e.g. using electro conductivity of substrate or radio frequency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/20—Sensor having heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/022—Liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/025—Change of phase or condition
    • G01N2291/0258—Structural degradation, e.g. fatigue of composites, ageing of oils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/045—External reflections, e.g. on reflectors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • Ultrasonic sensor tank installation unit with an ultrasonic sensor
  • the invention relates to an ultrasonic sensor having the features of the Oberbe handle of claim 1.
  • the ultrasonic sensor is used to measure a signal transit time in a liquid for determining the quality of the liquid.
  • the invention further relates to a tank-mounting unit with a Ult ultrahigh-speed sensor according to the invention.
  • liquid whose quality is to be determined it may be in particular an aqueous urea solution for the aftertreatment of exhaust gases of an internal combustion engine.
  • the aqueous urea solution causes in the exhaust gas, the formation of ammonia, which reacts with the nitrogen oxides contained in the exhaust gas in a downstream cata- gate to harmless nitrogen and water G, selective catalytic Redukti on ").
  • the nitrogen oxide emissions of the internal combustion engine can be significantly reduced Lich.
  • the prerequisite is that the quality of the aqueous urea solution, in particular the urea content in the urea solution is correct. The quality or the urea content are therefore usually monitored.
  • the ultrasonic sensor according to the invention hen to se.
  • DE 10 2013 217 927 A1 discloses a tank installation unit for a tank for storing an operating / auxiliary substance, in particular an aqueous urea solution, which can be connected to the tank via an intermediate platform.
  • the intermediate platform may comprise a quality sensor, for example in the form of an ultrasonic sensor. This can either be directly linked to a corresponding attached cutting interface with an electrical contact, for example, welded, glued, screwed, latched or pressed, or be integrated directly into the material of the intermediate platform.
  • an ultrasonic sensor used as a quality sensor usually has a sensor unit with an ultrasonic generator and an ultrasonic receiver and at least one reflector.
  • the object of the reflector is to throw back a signal generated by the ultrasound generator onto the ultrasound receiver, the transit time of the signal being measured through the excipient or the aqueous urea solution. The measurement then allows conclusions on the density of the aqueous urea solution and thus on the urea content. If necessary, the dosage can be adjusted or - in the case of an impermissible quantity of urea - an error message can be displayed. In this way, a constant nitrogen oxide reduction or in the event of a fault, a timely error message is ensured.
  • the signal propagation time must be measured with a constant measuring distance.
  • this is not always guaranteed, since in particular temperature-induced changes in length can affect the measuring path.
  • mechanical stresses in the long run can lead to deformations, displacements, twists and / or twists, which change the distance and / or the orientation of the reflector with respect to the ultrasonic generator or the ultrasonic receiver.
  • an ultrasonic sensor for transit time measurement in a liquid, in particular in an aqueous urea solution which comprises a transmitter / receiver and a first and second reflector to increase the accuracy of measurement.
  • the arrangement of the two reflectors is at different distances to the transmitter / receiver, so that different Liche terms result, the difference can serve as a reference.
  • the two reflectors are also each formed in the shape of a cylinder and arranged preferably before standing, so that the angular orientation of the reflectors no longer affect the measurement, since the geometric reflection region from each angle of the illumination is identical.
  • the shape and orientation of the reflectors also reduces the risk that dirt particles and / or air bubbles accumulate and impair the measurement accuracy.
  • the vorlie lowing object of the invention is to provide an ultrasonic sensor for measuring a signal propagation time in a liquid, in particular in an aqueous urea material solution to determine the quality of the liquid against thermal and / or mechanical Loads is particularly robust. In this way, an ultrasonic sensor is to be created, which has a high accuracy over life.
  • the proposed ultrasonic sensor for measuring a signal propagation time in a liquid, in particular in an aqueous urea solution, for determining the quality of the liquid comprises a sensor unit with an ultrasonic generator and an ultrasonic receiver. Furthermore, the ultrasonic sensor comprises a reflector arranged at a distance to the sensor unit, which together with the sensor unit defines a measuring path. According to the invention, the reflector has at least one support arm for connection to the sensor unit and / or to a housing part in which the sensor unit is fixed in position taken.
  • the support arm allows a connection of the reflector directly to or at least in the immediate vicinity of the sensor unit, while the reflector itself is arranged at a significantly greater distance from the sensor unit to define the measuring section.
  • the support arm for connection of the reflector preferably extends in We sentlichen parallel to the measuring section. Thermally induced changes in length of the support arm thus do not affect the orientation of the reflector with respect to the sensor unit.
  • the support arm is arranged outside the measuring section is. In this way, the risk can be reduced that the fürzu leading measurement of the signal propagation time is falsified by unwanted reflections of the ultrasonic waves on the support arm.
  • the support arm is integrally formed with the reflector, so that Rela tivschulen of the reflector relative to the support arm can be excluded. Because could also lead to a change in the test section and thus influence the measurement result.
  • the support arm is formed of the same material as the reflector gate, so that the material of the support arm and the reflector have the same coefficient of thermal expansion.
  • the material may in particular be a special metal such as steel or stainless steel, or a ceramic. These materials do not change their behavior under thermal and / or me chanischer load in the long term or only very slightly, so that their behavior remains predictable to make any corrections. Thus, a high measurement accuracy of the ultrasonic sensor over its entire lifetime is achieved.
  • the reflector is designed circular and has a plurality of support arms, which are preferably arranged in sliding angle to each other and radially outward with respect to the reflector. In this way, an optimal support of the reflector can be effected, so that the mechanical load capacity of the ultrasonic sensor increases. If the ultrasonic sensor is to be used to determine the urea content of an aqueous urea solution in a tank on board a motor vehicle, In this way, the ice pressure resistance of the ultrasonic sensor can be further increased. Because at temperatures below -11 ° C, the aqueous urea solution freezes.
  • the reflector has a shape deviating from the circular shape, for example the shape of an ellipse or a polygon, in the case of a plurality of support arms, these likewise preferably are each arranged on the outside of the reflector. In this way, two support arms can be opposite to the reflector to optimally support this.
  • the reflector is preferably held exclusively on the one support arm or the plurality of support arms, so that thermally induced changes in length of the support arm or the support arms are zwhackungslitis possible. As a result, it is ensured that the orientation of the reflector with respect to the sensor unit remains largely unchanged.
  • the reflector has a flat, spherical or parabolic reflector surface.
  • the newly executed Re reflector surface has the advantage that it is comparatively easy and cost to manufacture cheap.
  • the proposed curved shapes allow an enlargement of the reflector surface with the same outer diameter or with the same outer dimensions. This is in particular of part before, if not all the ultrasonic waves thrown back through the reflector who should, but a part of the ultrasonic waves to pass the reflector laterally, for example, to carry out a further measurement, in particular a level measurement.
  • a further function can be integrated in this way, which eliminates the need for a further sensor, in particular a separate filling level sensor.
  • the reflector has an opening which allows a part of the ultrasonic waves generated by the sensor unit to carry out a further measurement, in particular a filling level measurement.
  • the opening may for example be arranged centrally, so that this part of the ultrasonic waves has a defined orientation for imple tion of further measurement.
  • the housing unit receiving the sensor unit is a housing part of the ultrasonic sensor or a housing part of a tank installation unit. If it is a housing part of the ultrasonic sensor, this has its own housing or forms an independent module.
  • the ultrasonic sensor does not need its own housing, so that the space requirement can be reduced. All necessary connections can also be integrated in the housing part of the tank installation unit, so that only the sensor unit and the reflector must be mounted.
  • the integration of the ultrasonic sensor in the tank installation unit is particularly suitable for the application in which is to be determined by means of the ultrasonic sensor, the urea content of a pre-fermented in a tank aqueous urea solution. Because the Tankeinbauein unit can be used in this case at the same time as a carrier for other components of a Do siersystems for dosing the aqueous urea solution. These further components may in particular be a pump, a filter and / or a heating device.
  • the ultrasonic sensor is connected to the housing part and the housing part - regardless of whether this is a housing part of the ultrasonic sensor or a tank installation unit - an interface for connection to a tank for the liquid or having the aqueous urea solution.
  • the interface ver simplifies the installation of the ultrasonic sensor or the tank installation unit.
  • a tempera ture sensor is integrated in the sensor unit or in the housing part. Since the speed of the ultrasonic waves depends on the temperature of the liquid, changes in temperature can be detected by means of the temperature sensor and on the basis of which an adjustment of the correction values can be made. As a result, the measurement accuracy can be further increased.
  • the reflector preferably forms a heating device or a heat conducting body connected to a heating device. In this way, a freezing of the liquid in the region of the reflector counteracted the who or already frozen liquid can be thawed. If the reflector itself forms a heater, for example, the heat can be effected by means of Inuction.
  • the sensor unit can serve as a heat source and / or comprise heat sources.
  • the reflector and / or the support arm is or are surrounded by a protective wall at least in certain areas.
  • the protective wall may in particular extend arcuately around the reflector and / or the support arm.
  • a plurality of protective walls may be arranged around the reflector and / or the support arm.
  • the at least one protective wall effects a protection of the ultrasonic sensor from mechanical damage during assembly and / or during operation. For example, damage can be prevented by the protective wall due to ice pressure or by floating ice blocks on the components relevant to the measurement ver.
  • the at least one protective wall can be formed by a separate component which is fastened to the housing part of the ultrasonic sensor or the tank installation unit.
  • the protective wall may be formed integrally with the housing part.
  • the one-piece design has the advantage that the assembly costs decreases and a permanent positional fixation of the protective wall is ensured.
  • the protective wall is preferably tubular, so that it encloses the reflector and / or the at least one support arm completely or at least over an angular range of more than 180 °.
  • the protective wall can also be designed as a tube which is open over its entire length. Over the open area can or can be used in a simple way, the reflector and / or the support arm.
  • liquid can flow into the pipe via the opening, so that it is ensured that a sufficient amount of the liquid is in the region of the measuring path.
  • the sensor unit of the ultrasonic sensor comprises an ultrasonic generator and an ultrasonic receiver. These can be formed by a construction part or executed as separate components.
  • the one-piece design reduces the installation effort and the space requirement of the finished sensor.
  • the separate version allows an optimization of the Ult ULS sensor in terms of sensitivity, accuracy and / or resolution.
  • a piezoelectric crystal or a piezoelectric ceramic for.
  • PZT lead zirconate titanate
  • the ceramic has a particularly high piezoelectric Koeffizien th.
  • a printed circuit board and / or electrical connection elements are or are integrated into the housing part for contacting the sensor unit.
  • the electrical connection elements can be out of the housing part ge leads out to realize the required electrical connection.
  • the electrical connection elements in a plug part can the en, which can be connected in a simple manner with another plug part of a power cable.
  • the electrical connection elements allow a data connection of the ultrasonic sensor to motor or other control devices.
  • the electrical connection elements can example, be formed by Flachsteckerstromschienen.
  • the circuit board and / or the electrical connection elements to be fixed in position by means of casting resin in the housing part or are.
  • About the casting resin can be achieved at the same time a seal against the liquid and there with an insulation of the electrical components.
  • a seal can be effected by means of a welded-on lid.
  • the recorded in the housing part Sensorein unit is embedded in casting resin and / or separated by a membrane from the liquid.
  • a seal of the sensor unit is achieved ge compared to the liquid.
  • a seal by means of a membrane is preferred, which is designed such that it is fluid-tight, but forwards ultrasonic signals.
  • the air gaps between the sensor unit and the membrane should be avoided.
  • the sensor unit can rest on a damping element. As a damping element can beispielswei se serve a simple show mstoffpad.
  • the sensor unit and the Dämp tion element are inserted into the housing part and preferably subsequently shed rizd with casting resin.
  • the proposed ultrasonic sensor allows the measurement of a signal transit time in a liquid, wherein a change in transit time, taking into account the temperature to close a density change. If the liquid is an aqueous urea solution, it is possible to deduce from the density variation to a changed urea concentration, so that the quality of the aqueous urea solution can be determined by means of the ultrasonic sensor. Accordingly, the ultrasonic sensor can also be referred to simply as a quality sensor.
  • the negative effects of thermally induced changes in length can be reduced to the measurement accuracy.
  • the connection of the reflector by means of at least one support arm un indirectly on or in the immediate vicinity of the sensor unit so that essentially only the change in length of the reflector including the support arm is taken into account. Since the at least one support arm and the reflector un unhindered, in particular constraint-free, can expand, the Ausrich direction of the reflector with respect to the sensor unit remains substantially the same.
  • correction values for the length changes can be calculated and included in the measured values. For example, the length changes can already be taken into account when programming the sensor characteristic and thus make a significant contribution to sensor accuracy.
  • the membrane, the sensor unit and / or the housing part are subject to thermally induced changes in length. However, these are due to smaller dimensions - especially pronounced in signal transmission and signal reception direction - less pronounced. Furthermore, these can also be considered in the Kennlinienpro programming.
  • the proposed ultrasonic sensor is preferably installed together with wide Ren components in a tank for storing the liquid. In order to simplify assembly and increase cost-effectiveness, the Ultraplan sensor can be integrated with the other components in a tank installation unit.
  • a Tankein is also proposed building unit with an ultrasonic sensor according to the invention.
  • the ultrasonic sensor is preferably arranged together with a pump, a filter and / or a heating device on a platform of the tank installation unit.
  • the platform enables a compact space-saving arrangement of the various components.
  • the platform is mounted during assembly from below to an opening in the tank bottom, so that the components arranged on the platform are in the tank.
  • the tank installation unit has an interface for connection, preferably for welding, with the tank, so that at the same time a seal from Ab is achieved.
  • the ultrasonic sensor is preferably arranged on the platform or integrated into the tank installation unit such that the measurement path runs essentially parallel to the platform of the tank installation unit. This ensures that the ultrasonic sensor is always covered by liquid even at low levels.
  • the liquid can be conveyed from the tank to a metering module.
  • the aqueous urea solution can be metered into an exhaust gas line with the aid of the metering module.
  • the filter provided so far, prevents unwanted particles from being discharged with the who. With the help of the heater, a freezing of the liquid or the aqueous urea solution can be prevented or already frozen liquid or ge frozen aqueous urea solution can be thawed again.
  • the tank installation unit may include further components, in particular further sensors, such as, for example, a fill level sensor, a temperature sensor. tursensor and / or include a pressure sensor.
  • the tank installation unit may have electrical and / or hydraulic connections.
  • heat-conducting elements are present in order to achieve an optimum distribution of the heat of the heating device in the tank. The list of possible further components is not exhaustive.
  • FIG. 1 is a sectional view of an ultrasonic sensor according to the invention according to a first preferred embodiment
  • FIG. 2 is a perspective view of the ultrasonic sensor of FIG. 1, but without protective wall,
  • FIG. 3 is a perspective view of an ultrasonic sensor according to the invention according to a second preferred embodiment
  • FIG. 5 is a perspective view of the ultrasonic sensor of Fig. 4,
  • FIG. 6 is a perspective view of a tank installation unit according to the invention.
  • Fig. 7 is a sectional view of the tank installation unit of Fig. 6 and
  • FIG. 8 is an enlarged sectional view of the tank installation unit of FIG. 6.
  • the illustrated in Fig. 1 inventive ultrasonic sensor 1 comprises a housing part 6, with a bottom-side opening into which a sensor unit 2 is set with an ultrasonic generator and an ultrasonic receiver in such a way is that they come to rest on a membrane 17.
  • a membrane About the membrane ran 17 the mitels the sensor unit 2 generated ultrasonic signals are forwarded to the outside in the direction of a reflector 3, which is arranged at a distance from the sensor unit 2 and fastened by means of a support arm 5 on the housing part 6 be.
  • the support arm 5 has at its end facing away from the reflector 3, an annular connecting element 23 which engages behind the membrane 17.
  • connection of the support arm 5 and thus of the reflector 3 to the housing part 6 is thus in the immediate vicinity of the sensor unit 2.
  • the influence of thermally induced changes in length can be significantly reduced to the mitels of the ultrasonic sensor 1 measurements.
  • the reflector 3 and the support arm 5 are surrounded by an arcuately extending protective wall 12, which is formed by the housing part 6.
  • the housing part 6 Essentially concentric with the protective wall 12, the housing part 6 has a cutting point 10 formed on a circumferential collar for connection to a tank (not shown) for the liquid.
  • a tank (not shown) for the liquid.
  • Over the interface 10 of the ultrasonic sensor 1 can be welded to the tank.
  • the ultrasonic sensor 1 is for this purpose introduced through a bottom opening of the tank in the tank until the interface au Shen comes to rest on the tank and can be welded to it. At the same time a seal is achieved via the welded connection.
  • the housing part 6 and the tank are made of materials which can be welded together.
  • both the housing part 6 and the tank made of plastic.
  • a plug part 22 is further formed, which - as in the present case - can be made of a different plastic than the housing part 6.
  • a capillary lock 28 is also arranged, in order to protect at a leak to the inside of the tank connected to the ultrasonic sensor 1 STEU er réelle (not shown) from damage.
  • the loan terplate 13 is arranged below the sensor unit 2, that is, it was after the sensor unit 2 in the bottom opening of the housing part 6 is set.
  • a damping element 24 was first inserted in the dargestell th ultrasonic sensor 1, which is to cause a signal attenuation down.
  • Sensor unit 2 and Dämpfungsele element 24 were then potted with a first resin 16. In order to avoid air inclusions, a small amount of cast resin has already been poured into the opening of the housing part 6 before mounting the sensor unit 2.
  • the Sen sorritt 2, the damping element 24 and / or the circuit board 13 may also be mounted before and used as a preassembled unit in the housing part 6 and cast on closing.
  • the potting can be done by holes provided or recesses in the circuit board 13 or laterally on the circuit board 13 before.
  • the ultrasonic sensor 1 is shown without the protective wall 12 to show the membrane 17.
  • the reflector 3 is held over the support arm 5, which runs parallel to the measuring section 4 (see also Fig. 1) and the membrane 17 engages by means of an annular connecting element 23 back.
  • the connecting element 23 can be inserted both during the injection process with, as well as then mounted and secured.
  • the Memb ran 17 facing surface of the reflector 3 is about the same size as that of the membrane 17, so that the generated by means of the sensor unit 2 and passed through the membrane 17 ultrasonic signals are almost completely reflected.
  • the ultrasonic signals serve a further purpose, for example, be used for level measurement
  • the surface of the reflector 3 and smaller than those of the membrane 17 or the underlying Sen sorloch 2 are selected so that a part of the ultrasonic signals tor the reflector 3 can pass laterally and possibly only at the boundary layer between the liquid and the air present in the tank is reflected , In this way, the level in the tank can be detected. A separate level sensor is then unnecessary.
  • the ser instead of reducing the surface of the reflector 3, but the ser also have an opening 8, as shown by way of example in Fig. 3, so that a part of the ultrasonic signals can pass through the reflector 3 therethrough.
  • FIG. 4 shows a further preferred embodiment of an inventive ultrasonic sensor 1.
  • the support arms 5 are arranged on opposite sides of the reflector 3, so that it is optimally supported. This ensures that the orientation of the reflector 3 with respect to the membrane 17 or the sensor unit 2 remains essentially unchanged over the lifetime.
  • the reflector 3 also has an opening 8, so that the ultrasonic sensor 1 can be used both as a quality sensor and as a level sensor. However, the opening 8 is not mandatory if the function of the level measurement is not desired.
  • the same ultrasonic sensor 1 without opening 8 is shown in FIG. 5.
  • the opposing support arms 5 themselves already form a kind of protective wall, in the embodiments of Figures 4 and 5, the actual protective wall 12 is limited to two slightly curved protective walls 12, which rule between the support arms 5 are arranged. Distances between the protective walls 12 and the support arms 5 ensure that the liquid stored in the tank reaches the area of the measuring section 4.
  • the ultrasonic sensors 1 illustrated in FIGS. 1 to 5 each represent stand-alone solutions.
  • the ultrasonic sensor 1 according to the invention into a tank installation unit 9.
  • the ultrasonic sensor 1 in this case has no separate housing part 6, but is accommodated in a housing part 7 of the tank installation unit 9.
  • the plug part 22 can be omitted and the electrical contact can be made via an integrated into the tank installation unit 9 electrical interface, which is sealed after assembly due to the United welding.
  • the housing part 7 of the tank unit 9 can form a platform 21 on which the ultrasonic sensor 1 is arranged together with further components.
  • the housing part 7 (not shown) can be used in the region of a bottom opening of the tank to the tank bottom, that all components come to rest in the tank and the housing part 7 via an interface 10 to the tank verbun the, in particular welded, can be.
  • a pump 18, a filter 19 and a 20 Schuvorrich device 20 are arranged on the platform 21 together with the ultrasonic sensor.
  • a plug part 22 which is integrally formed on the housing part 7, the required electrical connection of the ultrasonic sensor 1 can be produced.
  • the pump 18 has its own plug part 22.
  • the ultrasonic sensor 1 is aligned in such a way that the measuring section 4 runs parallel to the platform 21 ver.
  • the reflector 3 via a paral lel to the platform 21 extending support arm 5 to the housing part 7 of the Tankein building unit 9 connected.
  • the support arm 5 has for this purpose a dacasele element 23 which is firmly anchored in the housing part 7 (see also Fig. 8).
  • the anchoring Ver via the connecting element 23 is the only fixation of the support arm 5 and the reflector 3, so that it prevents in the longitudinal direction unge, in particular constraint-free, can expand.
  • a guide is effected via lateral floating bearing 26.
  • two spring elements 27 are vorgese hen, which are arranged under the support arm 5 and serve the support. In this way signal-influencing movements, in particular Vibra tions, the reflector 3 is prevented or at least reduced.
  • the Federelemen te 27 are presently formed by two sealing rings (O-rings).
  • At least one heat-conducting body 25 can be integrally formed on the support arm 5 min. This can be connected to the heating device 20 or to another heat source (not shown). so that the heat-conducting body 25 gives off heat to the surrounding liquid. This prevents the liquid from freezing. Alternatively, already frozen liquid can be thawed again.
  • the reflector 3 itself can also serve as a heat-conducting body at the same time.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Acoustics & Sound (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un capteur ultrasonique (1) servant à mesurer le temps de propagation d'un signal dans un liquide, en particulier dans une solution aqueuse d'urée afin de définir la qualité du liquide. Le capteur ultrasonique selon l'invention comprend une unité de capteur (2) pourvue d'un générateur d'ultrasons et d'un récepteur d'ultrasons, et en outre un réflecteur (3) disposé à une distance donnée par rapport à l'unité de capteur (2), lequel définit conjointement avec l'unité de capteur (2) une section de mesure (4). Selon l'invention, le réflecteur (3) comporte au moins un bras de support (5) destiné à être relié à l'unité de capteur (2) et/ou à une partie de boîtier (6, 7), dans lequel l'unité de capteur est logée en position fixe. L'invention concerne en outre une unité intégrée à un réservoir (9) équipée d'un capteur ultrasonique (1) selon l'invention.
PCT/EP2018/081666 2017-11-28 2018-11-19 Capteur ultrasonique, unité intégrée à un réservoir équipée d'un capteur ultrasonique WO2019105774A1 (fr)

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DE102017221261.6A DE102017221261A1 (de) 2017-11-28 2017-11-28 Ultraschallsensor, Tankeinbaueinheit mit einem Ultraschallsensor
DE102017221261.6 2017-11-28

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WO2019105774A1 true WO2019105774A1 (fr) 2019-06-06

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Cited By (2)

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CN110596237A (zh) * 2019-09-27 2019-12-20 湖北晟正汽车零部件有限公司 一种尿素溶液浓度检测装置
CN112114035A (zh) * 2020-09-11 2020-12-22 东莞正扬电子机械有限公司 一种超声波传感器及其制备方法和应用

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DE102018218179A1 (de) 2018-10-24 2020-04-30 Robert Bosch Gmbh Sensoreinheit zur Bestimmung der Qualität eines Fluids
DE102018218947A1 (de) * 2018-11-07 2020-05-07 Robert Bosch Gmbh Vorrichtung zur Qualitätsbestimmung einer Flüssigkeit, Tankvorrichtung
DE102022200918B3 (de) * 2022-01-27 2023-04-27 Vitesco Technologies Germany Gmbh Verfahren zum Herstellen eines Ultraschallsensors und Ultraschallsensor

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EP1995570A1 (fr) * 2007-05-25 2008-11-26 Kamstrup A/S Débitmètre à ultrasons
WO2011064050A1 (fr) * 2009-11-26 2011-06-03 Continental Automotive Gmbh Procédé de détermination de l'état d'un agent réducteur dans un réservoir d'agent réducteur
DE102011013687A1 (de) * 2011-03-11 2012-09-13 Continental Automotive Gmbh Verfahren zur Kalibrierung eines Füllstandsensors
US20140196536A1 (en) * 2013-01-15 2014-07-17 Ssi Technologies, Inc. Three-mode sensor for determining temperature, level, and concentration of a fluid
WO2014202374A1 (fr) * 2013-06-18 2014-12-24 Inergy Automotive Systems Research (Société Anonyme) Réservoir à urée de véhicule associé à une chambre de détection pour la détection de la qualité acoustique et du niveau
DE102013217927A1 (de) 2013-09-09 2015-03-12 Robert Bosch Gmbh Zwischen-Plattform zur Aufnahme einer Tankeinbaueinheit an einem Tank
DE102013219643A1 (de) 2013-09-27 2015-04-02 Continental Automotive Gmbh Ultraschallsensor
DE102014109843A1 (de) * 2014-07-14 2016-01-14 Continental Automotive Gmbh Verfahren zur Bestimmung des Füllstands in einem Tank

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Publication number Priority date Publication date Assignee Title
EP1995570A1 (fr) * 2007-05-25 2008-11-26 Kamstrup A/S Débitmètre à ultrasons
WO2011064050A1 (fr) * 2009-11-26 2011-06-03 Continental Automotive Gmbh Procédé de détermination de l'état d'un agent réducteur dans un réservoir d'agent réducteur
DE102011013687A1 (de) * 2011-03-11 2012-09-13 Continental Automotive Gmbh Verfahren zur Kalibrierung eines Füllstandsensors
US20140196536A1 (en) * 2013-01-15 2014-07-17 Ssi Technologies, Inc. Three-mode sensor for determining temperature, level, and concentration of a fluid
WO2014202374A1 (fr) * 2013-06-18 2014-12-24 Inergy Automotive Systems Research (Société Anonyme) Réservoir à urée de véhicule associé à une chambre de détection pour la détection de la qualité acoustique et du niveau
DE102013217927A1 (de) 2013-09-09 2015-03-12 Robert Bosch Gmbh Zwischen-Plattform zur Aufnahme einer Tankeinbaueinheit an einem Tank
DE102013219643A1 (de) 2013-09-27 2015-04-02 Continental Automotive Gmbh Ultraschallsensor
DE102014109843A1 (de) * 2014-07-14 2016-01-14 Continental Automotive Gmbh Verfahren zur Bestimmung des Füllstands in einem Tank

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110596237A (zh) * 2019-09-27 2019-12-20 湖北晟正汽车零部件有限公司 一种尿素溶液浓度检测装置
CN112114035A (zh) * 2020-09-11 2020-12-22 东莞正扬电子机械有限公司 一种超声波传感器及其制备方法和应用

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