EP3004656A1 - Ultraschall-wegmesssystem und verfahren zur ultraschall-wegmessung - Google Patents
Ultraschall-wegmesssystem und verfahren zur ultraschall-wegmessungInfo
- Publication number
- EP3004656A1 EP3004656A1 EP14722095.8A EP14722095A EP3004656A1 EP 3004656 A1 EP3004656 A1 EP 3004656A1 EP 14722095 A EP14722095 A EP 14722095A EP 3004656 A1 EP3004656 A1 EP 3004656A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ultrasonic
- separating element
- sensor
- media
- measuring system
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2884—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using sound, e.g. ultrasound
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
- F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/20—Accumulator cushioning means
- F15B2201/205—Accumulator cushioning means using gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/50—Monitoring, detection and testing means for accumulators
- F15B2201/515—Position detection for separating means
Definitions
- the invention relates to an ultrasound displacement measuring system, in particular applicable for hydraulic accumulators having at least one movable separating element, which preferably separates medium-density media from one another within a housing, wherein one media space is a compressible or an incompressible fluid and the other media space is an uncomfortable fluid. Pressibles Fl uid, in particular in the form of a working gas, receives, wherein by means of at least one U ltraschallsensors the jewei time position of the movable separating element within the housing can be detected.
- the invention further relates to a method for ultrasound l-displacement measurement with such an ultrasonic displacement measuring system.
- Such an ultrasound 1-channel system is provided by the company marco System analyses und Anlagen GmbH, Hans-Böckler-Str. 2, 85221 Dachau, Germany, under the name "ps / ul m / esd / a.” Sound signals are emitted by a ultrasonic transducer and reflected by a piston, and the reflected sound wave is then picked up again by the ultrasonic transducer
- the scarf lsignal with a known propagation speed in the oil, so that from the signal transit time, the distance of the piston can be determined with the ultrasonic transducer.Advantage here is that the scarf lausbreitung depends significantly on the oil temperature and undesirable in oil gas bubbles which, for example, can cavitate in the oil due to cavitation, such gas bubbles considerably influence the propagation of the sound signal and thus falsify the measurement result.
- the object of the invention is to provide a U ltraschal l-way measuring system and a method for l ltraschal l-way measurement with such a system, with which Path measurements can be made reliably, accurately and inexpensively.
- a solution of the subject Tei ls this task is an ultrasonic l-way measuring system with the features of claim 1.
- Advantageous embodiments of the ultrasonic displacement measuring system are evident from the subclaims 2 to 10.
- the procedural part of the object is achieved by a method with the measures of claim 1 1.
- the U ltraschal lsensor makes its position detection of the separating element on the side of the other media space with the compressible fluid.
- the position of the separating element can be detected very accurately, because the ultrasonic signal must only propagate through a gaseous fluid, such as nitrogen gas. Regardless of the movement of the separating element and the ambient conditions, there are no phase transitions in this compressible gas, so that measuring errors that are inherent need not be taken into account. Due to the fact that the compressible fluid is a gas, the usually electrically controlled ultrasound sensor is always stored in a dry state so that no impairment due to moisture during operation of the sensor is to be feared. The ultrasonic measuring system is therefore durable and requires little maintenance. The components required for the ultrasonic sensor are also available at relatively low cost, so that overall a cost-effective ultrasonic distance measuring system is shown. The position detection for the preferably piston-like separating element is reliably carried out both in static and in highly dynamic movement processes with the separating element.
- the ultrasound sensor is accommodated in a sensor chamber, the interior of which, by means of a media guide, leads with the other media in a media-guiding manner.
- ren media space is connected to the compressible fluid.
- the ultrasonic sensor is kept pressure balanced. No additional measures must be taken to support the sensor against the internal pressure in the other media space.
- the sensor can be made easier and freely suspended, so that the scarf generation and propagation can be done advantageously unbehi changed.
- the ultrasonic sensor is stationarily arranged on a lid part of the housing such that at least a portion of the sensor chamber projects with the media guide around a predeterminable projection into the other media space with the compressible fluid and in each displacement position of the separating element this held at a distance to the ultrasonic sensor.
- the pressure compensation of the sensor chamber can be made very easy.
- the sensor chamber can have at least one passage point between the support and the underside of the cover part facing the sensor element, which at least partially projects the media guide. Other fluid channels in the adjacent components are not required.
- the position of the ultrasonic wall-mounted sensor in this arrangement is optimally suited to the sound propagation, in particular when a separating element is located particularly close to the sensor, no sound reflections on other components will falsify the measurement result.
- the sensor chamber can advantageously be closed in the direction of the environment by a load, preferably in the form of a glass passage, whereby a cable connection is made from the ultrasound sensor to a control unit via the glass feedthrough.
- a load preferably in the form of a glass passage
- a cable connection is made from the ultrasound sensor to a control unit via the glass feedthrough.
- the ultrasonic sensor has an ultrasonic transducer with a piezoceramic, preferably in the form of a disk, which is arranged on a carrier, which preferably terminates the sensor chamber in the direction of the other media chamber with the compressible fluid.
- the piezoceramic can be arranged so that it expands or contracts in the radial direction depending on the annealing tension.
- the carrier By a Vol lflambaige bonding of the piezoceramic with the carrier, the carrier is then placed under bending stresses, so that the carrier bulges.
- By appropriate excitation of the piezoceramic can be generated in the compressible Fl uid of the other media space in this way an ultrasonic lwel le. Accordingly, the principle of action can be reversed when the wearer is vibrated by scarfs, causing bending thereof. These vibrations are then transmitted to the piezoelectric element in the form of expansions or contractions, which are converted into electrical voltages that can be evaluated with a suitable control electronics.
- a reference measuring path which is bounded by two preferably stationary stationary reference points, one of which is formed by the Ltraschal sensor and the other is formed by a preferably stationary deflecting element for the sensor signal, preferably the shape has a boundary wall of the sensor chamber. Due to the reference distance, it is possible to measure simultaneously with the measurement of the transit time of the sound signal from the ultrasonic sensor to the separating element and back the running time of the same scarf lsignals on the Referenzmesumble. In this way, the sound propagation velocity in the fluid of the other media space can be measured on the reference measuring path, which can then be used to determine the position of the separating element on the basis of the signal propagation time and the current propagation speed.
- the measuring section lies between the ultrasonic sensor and the separating element with respect to the ultrasonic sensor lies on the opposite side of the reference path. Consequently, the measuring sections do not influence each other. Also, no reference object must be arranged in the scarf path between the ultrasonic sensor and the separating element, which could falsify the measurement result due to interferences. Furthermore, there is also no risk that the Tei lelement abuts the reference object and damaged it in this way.
- the boundary wall may be in the form of a shoulder in the sensor chamber. It has been shown here that an uneven boundary wall is also sufficient for determining the scarfing propagation speed.
- the separating element is made of a rigid limiting piston, which is movably arranged within the housing in the direction of its longitudinal axis, and in that the ultrasonic sensor is arranged coaxially with respect to this longitudinal axis.
- the separator can only move in one dimension, which makes the structure of the ultrasonic l-Wegmesssystems erhebl I simplified and sources of error are excluded. In addition, this improves the quality of the reflected sound signal.
- the separating element preferably in the form of a limiting piston, a collecting device for incompressible fluid, which during operation of the U ltraschal l-way measuring system from the media space with the incompressible fluid through a gap between the limiting piston and the housing in the other media space with the compressible Fluid penetrates, and that the collecting device, preferably in the form of a collecting basin in the limiting piston, the ultrasonic lsensor in the direct scarf labstrahlraum adjacent is disposed opposite.
- the incompressible fluid that has entered the other media space collects in the collector.
- the operating frequency of the ultrasound sensor can be between a lowest possible frequency, in particular 100 kHz, at which a low wave-dependent amplitude modulation due to dispersion occurs, and a comparatively higher frequency, in particular 1 50 kHz, at the higher wavelength of the lesser wavelength Distance measurement is possible to be selected.
- the sound signal has a wavelength of approximately 40 mm, so that the position of the separating element can be determined very precisely. At least the measuring accuracy is substantially higher than in the known displacement measuring systems.
- a sound signal is transmitted by means of the ultrasonic sensor and the sound reflection is detected on the separating element and a reference point lying opposite the ultrasonic sensor.
- the sound propagation velocity in the compressible fluid is determined from the transit time of the sound signal from the ultrasonic sensor to the reference position to be assigned and back. From this scarf lausbreitungs york and the duration of the scarf lsignals from U ltraschal l sensor to the separating element and back then the jewei time distance of the movable separating element from the stationarily arranged U ltraschal lsensor is determined.
- the measurements of the transit times on the measuring section and the reference measuring section can be made with a time delay or simultaneously.
- the measurement accuracy is improved in particular by a simultaneous measurement, since during a rapid movement of the separating element during one stroke, an adiabatic change of state of the compressible fluid in the other media space can occur. For example, its temperature may rise; whereby the scarf lausbreitungsgeschwi tmaschine changes and so the measurement accuracy can be affected.
- FIG. 1 shows a longitudinal section through an accumulator with an inventive ultrasonic displacement measuring system
- Fig. 2 shows the ultrasonic sensor of Fig. 1 in an enlarged Thomasdarstell ung.
- an ultrasound l-way measuring system 1 is shown, which is used in a hydraulic accumulator 3 with at least one movable separating element 5, which separates two media spaces 9, 1 1 from each other substantially media-tight within a housing 7.
- the one media space 9 takes an incompressible fluid, in particular in the form of hydraulic oil and the other media space 1 1 a compressible fluid, in particular in the form of a working gas, here nitrogen (N_), on.
- N_ nitrogen
- U ltraschallsensors 1 3 By means of a U ltraschallsensors 1 3 is the jewei time position of the movable separating element 5 i within the housing 7 detected.
- the housing 7 has a tubular housing part 1 5, in the end two Deckeltei le 1 7, 1 9 are screwed through threaded sections 21.
- the cover parts 1 7, 19 are held in circumferential grooves 23.
- the two cover parts 1 7, 1 9 have coaxial bores 27, 29, wherein in the lid part 1 7, which leads to the media space 9 with the incompressible fluid, a connection 31 for a fluid line of a hydraulic not shown in detail Circle is provided.
- the separating element 5 is formed of a rigid limiting piston, which is arranged movable within the housing 7 in the direction of the longitudinal axis LA.
- the limiting piston 5 is cup-shaped Annular end, with a bottom 33 in the direction of a media space 9 has.
- On the limiting piston 5, two spaced-apart grooves 35 are provided on the outer peripheral side, in which guide rings 37 are arranged. Between the guide rings 37, a further circumferential groove 39 is provided, in which a sealing element 41 is arranged.
- the separating element 5 is designed to increase the storage reservoir of gaseous and to that extent compressible fluid in the manner of a pot or trough and has on the bottom side a collecting device 43 for an incompressible fluid, which is optionally discharged from the oil side of the reservoir via the sealing device w ith the sealing element 41, it reaches the gas side unwholly.
- the Sammeleinrich- device 43 is so far in the form of a longitudinal axis LA also coaxial collecting basin in the limiting piston 5 is formed. This collecting device 43 is thus arranged opposite the U ltraschal lsensor 1 3 in the di rect Schallab ⁇ beam direction adjacent.
- a sleeve-shaped sensor holder 45 is inserted, in particular screwed.
- the sensor holder 45 has adjacent to the outer side 47 of the Deckeleltei ls 1 9 a threaded section 49 and a widened head 51. Between the head 51 and the Deckelstei l 1 9 n ei annular sealing member 53 is seen ⁇ .
- the sensor holder 45 is hollow to form a sensor chamber 57.
- the interior 55 of the sensor chamber 57 is connected by means of a En arrangement 59 media leading to the other media space 1 ⁇ connected to the compressible fluid in the form of the working gas.
- the sensor chamber 57 has for this purpose between a carrier 61 of the ultrasonic sensor 1 3 and the separator facing the bottom 63 of the cover part 1 9 more fürlassstel len 59 in the form of holes on.
- the U ltraschal Isensor 1 3 is held in the sensor holder 45.
- the ultrasonic sensor 13 performs its position detection of the separating element 5 on the side of the other media space 1 1 with the compressible fluid.
- the ultrasound sensor 1 3 is arranged coaxially to the longitudinal axis LA of the housing 7. It is accommodated in the sensor chamber 57 at the end.
- the ultrasonic sensor 1 3 is stationarily arranged on the cover plate 1 9 such that at least a portion of the sensor chamber 57 projects with the media guide 59 with a predeterminable projection U into the other media space 11 with the compressible flange and in each case Traversing position of the separating element 5 is kept at a distance therefrom.
- the U ltraschal lsensor 1 3 druckausgegl is kept in the other media space 1 1.
- the sensor 1 3 without having to fear a shock to be included in the cup-like depression of the separating element 5 with collector 43 and thereby perform sensor measurements.
- the ultrasonic sensor 1 which is shown in more detail in Fig. 2, has a U ltraschal lwandler 65 with a disk-shaped piezoceramic 66, which is arranged on the ebenfal ls disk-shaped support 61 by vol lflambaige bonding.
- the carrier 61 closes the sensor chamber 57 in the direction of the other media space 11 with the compressible fluid.
- the carrier 61 has a circumferential groove 67, so that it is held securely over egg nen O-ring 69 in an inner circumferential groove 71 of the sensor chamber 57.
- the piezoceramic 66 can expand or contract radially and this change in length on the carrier ger 61 so that the carrier 61 is deflected periodically, in particular bulges and generated in this way the desired scarf lwel le.
- a reference measuring distance i is present within the sensor chamber.
- the reference measuring section is bounded by two reference points 1 3, 73 which are arranged stationary relative to one another.
- the ei ne reference point is the ultrasonic sensor 13 itself and the other reference point is a deflection point 73 for the sensor signal.
- This deflection lever 73 is bounded by a boundary wall, in this case a shoulder of the inner wall of the sensor chamber 57.
- the deflection point 73 and the separating element 5 are thus arranged vortei lly on counsell lying sides of the U ltraschal lsensors 1 3.
- the measuring section and the reference path are therefore independent of each other.
- the Umlenkstel le 73 is provided at a protected position, so that they can not be influenced by the separating element 5 usst.
- the sensor chamber 57 is in the direction of the environment of a G lasteil 79, preferably in the form of a G las trim arrangement covered.
- a G lasteil 79 of the ultrasonic lsensor 1 3 with egg ner control unit 85 via a Jardinverbi tion 83 is connected.
- the ultrasonic sensor 1 3 is operated at a predetermined operating frequency. This frequency can be chosen between a low frequency and a higher frequency. The extent lower frequency is chosen so that a small wave-dependent Ampl itudenmodulation and thus little dispersion occurs and is in particular 100 kHz. At the higher frequency, a higher resolution is possible in the distance measurement due to the shorter wavelength.
- the higher frequency is preferably 1 50 kHz.
- the U ltraschal l-displacement measuring system 1 is arranged in a hydropneumatic pressure accumulator 3.
- the separating element 5 is moved within the pressure accumulator 3 in order to produce pressure equalization between the fluids in the two media spaces 9, 11.
- the position of the separating element 5 can be determined meanwhile with the ultrasonic displacement measuring system 1.
- a sound signal with the U ltraschall- sensor 1 3 emitted and the scarf I reflections on the separating element 5 and on the ultrasound lsensor 1 3 opposite utilise Referenzstel le 73 are detected, so that the maturities the reflected scarf lwel len with the control unit 85 can be determined. From the duration of the scarf lsignals from U ltraschal lsensor 1 3 to the assignable reference point 73 and back the scarf lausbreitungs york in the compressible fluid of the other media space 1 1 is determined.
- the invention thus provides a particularly advantageous ultrasonic transmission measuring system 1.
- the position of the separating element 5 can be detected very accurately, because the ultrasonic signal only has to propagate through a fluid. Regardless of the movement of the separating element 5 and the ambient conditions, no phase transitions take place in this compressible fluid, so that the measurement errors involved need not be taken into account. Due to the fact that it is usually a gas in the compressible fluid, the electrically controlled U ltraschallsensor 1 3 is always stored dry, so that during operation no impairment of the U ltraschal lsensors 1 3 is to be feared by moisture. The ultrasonic 1-way measuring system 1 is therefore durable and low maintenance.
- the components required for the ultrasound sensor 1 3 are also available relatively inexpensively.
- the minimum path measuring distance for the sensor 1 3 is formed by the bottom dead center of the piston-like separator 5, as soon as this comes into contact with the separator 5 facing the top of the lower lid part 1 9.
- the solution of the invention can be the G round after also for pneumatic Anlagenl indians (not dargestel lt) use, in which the two media chambers 9, 1 1 are separated from each other by a piston-rod unit, wherein the rod of the pertinent unit to egg ner Cover side for articulation to Drittbautei le is led out and the two media chambers 9, 1 1 are alternately to reciprocate the piston-rod unit to a pneumatic supply anschliessbar.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201310009614 DE102013009614A1 (de) | 2013-06-06 | 2013-06-06 | Ultraschall-Wegmesssystem und Verfahren zur Ultraschall-Wegmessung |
| PCT/EP2014/000982 WO2014194973A1 (de) | 2013-06-06 | 2014-04-12 | Ultraschall-wegmesssystem und verfahren zur ultraschall-wegmessung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3004656A1 true EP3004656A1 (de) | 2016-04-13 |
| EP3004656B1 EP3004656B1 (de) | 2020-06-10 |
Family
ID=50679987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14722095.8A Not-in-force EP3004656B1 (de) | 2013-06-06 | 2014-04-12 | Ultraschall-wegmesssystem und verfahren zur ultraschall-wegmessung |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10288091B2 (de) |
| EP (1) | EP3004656B1 (de) |
| JP (1) | JP6538654B2 (de) |
| DE (1) | DE102013009614A1 (de) |
| WO (1) | WO2014194973A1 (de) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9587455B2 (en) * | 2015-04-15 | 2017-03-07 | Reel Power Licensing Corp. | Piston accumulator bladder apparatus system and method |
| DE102016007798A1 (de) | 2016-06-25 | 2017-12-28 | Hydac Technology Gmbh | Hydropneumatischer Kolbenspeicher |
| WO2017220179A1 (de) | 2016-06-25 | 2017-12-28 | Hydac Technology Gmbh | Hydropneumatischer kolbenspeicher |
| DE102016007824A1 (de) | 2016-06-25 | 2017-12-28 | Hydac Technology Gmbh | Hydropneumatischer Kolbenspeicher |
| US20180155121A1 (en) * | 2016-12-06 | 2018-06-07 | R. A. Nichols Engineering | System and method for controlling vapor expansions and contractions inside of closed storage vessels |
| DE102017129445A1 (de) * | 2017-11-10 | 2019-05-16 | Grob-Werke Gmbh & Co. Kg | Verfahren und Vorrichtung zur Bestimmung der Position eines Kolbens eines Hydraulikzylinders einer Werkzeugmaschine |
| US11078937B2 (en) | 2019-10-17 | 2021-08-03 | Hamilton Sunstrand Corporation | Performance enhancement of controllers for varying temperature conditions in hydraulic actuators |
| DE102021003255A1 (de) * | 2021-06-24 | 2022-12-29 | Hydac Technology Gmbh | Hydrospeicher |
| CN113944494B (zh) * | 2021-10-15 | 2024-01-12 | 太原理工大学 | 一种基于超声无线测距的液压支架自动调直方法及系统 |
| WO2023130164A1 (pt) * | 2022-01-05 | 2023-07-13 | Evehx Engenharia Ltda | Protetor inteligente para alongamento de cordoalhas com corta corrente com localizador para macaco hidráulico e seu uso |
| DE102023110088A1 (de) * | 2023-04-20 | 2024-10-24 | Carl Freudenberg Kg | Walzanordnung |
| CN118622798A (zh) * | 2024-06-12 | 2024-09-10 | 北京天玛智控科技股份有限公司 | 液压缸和液压缸运行状态检测方法 |
| CN119238867B (zh) * | 2024-12-03 | 2025-02-21 | 浙江恒道科技股份有限公司 | 一种用于热流道的气缸驱动器的行程位置检测组件 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1983003478A1 (fr) * | 1982-03-30 | 1983-10-13 | Martin Reuter | Procede et installation pour determiner une distance relative dans un dispositif a cylindre et piston |
| JPS59135307A (ja) * | 1983-01-24 | 1984-08-03 | Komatsu Ltd | シリンダのストロ−ク検出装置 |
| JPS60196641A (ja) * | 1984-03-21 | 1985-10-05 | Toshiba Corp | アキユムレ−タのガス漏洩検出装置 |
| IT1187955B (it) * | 1986-02-24 | 1987-12-23 | Marelli Autronica | Dispositivo rilevatore degli spostamenti di un organo mobile di un ammortizzatore telescopico per autoveicoli rispetto ad una parte fissa |
| JPS63277912A (ja) * | 1987-05-08 | 1988-11-15 | Kubota Ltd | シリンダ型アクチュエ−タのストロ−ク検出装置 |
| DE8802411U1 (de) * | 1988-02-24 | 1989-06-29 | Keller AG für Druckmeßtechnik, Winterthur | Druckmeßvorrichtung |
| US4938054A (en) * | 1989-05-03 | 1990-07-03 | Gilbarco Inc. | Ultrasonic linear meter sensor for positive displacement meter |
| US5221894A (en) * | 1992-03-02 | 1993-06-22 | Miller Electric Manufacturing Company | Weld current sensor |
| DE4239240A1 (de) * | 1992-11-21 | 1994-05-26 | Mueller Weingarten Maschf | Verfahren zur Regelung und/oder Überwachung eines Hydraulikspeichers |
| DE29507987U1 (de) * | 1995-05-15 | 1996-09-19 | Ferton Holding, Delemont | Ejektionsgerät zur Hochdruckejektion einer Flüssigkeit |
| JP2001065513A (ja) * | 1999-08-26 | 2001-03-16 | Toyota Autom Loom Works Ltd | 流体圧シリンダの位置検出装置及び該位置検出装置を備えた産業用車両 |
| DE10137988A1 (de) * | 2001-08-02 | 2003-02-13 | Continental Teves Ag & Co Ohg | Druckmittelspeicher |
| US8777906B1 (en) * | 2002-01-24 | 2014-07-15 | Robin Scott Gray | Syringe with inspection window |
| DE10322718B4 (de) * | 2003-05-20 | 2006-06-01 | Truma Gerätetechnik GmbH & Co. | Ultraschall-Positionsmesssystem und Verfahren dafür |
| DE10330914A1 (de) * | 2003-07-04 | 2005-01-27 | Horst Siedle Gmbh & Co. Kg. | Verfahren zur Ermittlung einer Aktuellen Position eines in einem Zylinder verschiebbaren untergebrachten Kolbens |
| DE102007035252A1 (de) * | 2007-07-27 | 2009-02-12 | Truma Gerätetechnik GmbH & Co. KG | Vorrichtung zum Bestimmen der Position eines Kolbens in einem Zylinder |
-
2013
- 2013-06-06 DE DE201310009614 patent/DE102013009614A1/de not_active Withdrawn
-
2014
- 2014-04-12 EP EP14722095.8A patent/EP3004656B1/de not_active Not-in-force
- 2014-04-12 JP JP2016517179A patent/JP6538654B2/ja not_active Expired - Fee Related
- 2014-04-12 WO PCT/EP2014/000982 patent/WO2014194973A1/de not_active Ceased
- 2014-04-12 US US14/895,018 patent/US10288091B2/en active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014194973A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US10288091B2 (en) | 2019-05-14 |
| WO2014194973A1 (de) | 2014-12-11 |
| DE102013009614A1 (de) | 2014-12-11 |
| JP2016526137A (ja) | 2016-09-01 |
| US20160123356A1 (en) | 2016-05-05 |
| JP6538654B2 (ja) | 2019-07-03 |
| EP3004656B1 (de) | 2020-06-10 |
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