EP3129661B1 - Methode pour acquisition de la position ou mouvement d'un piston dans un cylindre - Google Patents
Methode pour acquisition de la position ou mouvement d'un piston dans un cylindre Download PDFInfo
- Publication number
- EP3129661B1 EP3129661B1 EP15717128.1A EP15717128A EP3129661B1 EP 3129661 B1 EP3129661 B1 EP 3129661B1 EP 15717128 A EP15717128 A EP 15717128A EP 3129661 B1 EP3129661 B1 EP 3129661B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cylinder
- piston side
- gas
- movement
- 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.)
- Not-in-force
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000001514 detection method Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 16
- 230000005855 radiation Effects 0.000 claims description 10
- 238000011156 evaluation Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 31
- 230000008859 change Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 244000089486 Phragmites australis subsp australis Species 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- RZTAMFZIAATZDJ-UHFFFAOYSA-N felodipine Chemical compound CCOC(=O)C1=C(C)NC(C)=C(C(=O)OC)C1C1=CC=CC(Cl)=C1Cl RZTAMFZIAATZDJ-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 210000002023 somite Anatomy 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Images
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
- 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 a method for detecting the position and / or movement of a piston in a cylinder having a longitudinal center axis, wherein a liquid is present on a first piston side and a gas on a second piston side.
- the invention relates to a cylinder assembly having a cylinder and having a movable therein along a longitudinal center axis of the cylinder piston, which is adapted to separate on a first piston side pending liquid from a pending on a second side of the piston gas.
- Such a method and such a cylinder arrangement are used in particular in connection with piston accumulators.
- the liquid is a hydraulic fluid that is pressed against a gas (for example, nitrogen) in this memory.
- the liquid-side cylinder volume communicates regularly via a hydraulic connection with a hydraulic device, from which hydraulic fluid can flow into the cylinder while overcoming the gas pressure prevailing on the second piston side or, upon release of the pressure, can flow out of the cylinder into the hydraulic device by displacement of the piston.
- the cylinder regularly has a connection via which gas with the desired pressure can be supplied to the cylinder. After reaching the desired gas pressure, the connection can be clamped.
- a constant contact with a larger, external gas pressure source can be maintained, which also - depending on the volume ratios between the cylinder and the gas pressure source - kept the gas pressure independent of the position of the piston in the cylinder more or less constant can be.
- a piston accumulator device in particular the hydraulic device, it may be necessary to detect changes in position of the piston. These may indicate, for example, a pressure drop due to a leak or a pressure increase due to load peaks.
- a disadvantage of these systems is that they either require the removal of components from the cylinder, which requires expensive sealing arrangements which are subject to wear. With other systems, position and / or motion detection can only be achieved with limited accuracy or require the presence of hydraulic fluid for coupling.
- a hydraulic actuator which has a cylinder with a piston moved by means of a hydraulic fluid.
- a laser beam is directed by means of a light guide in the cylinder on the piston, reflected at this and fed by means of a light guide to a control unit with which the light transit time is measured.
- the invention is therefore based on the object to provide an improved method for detecting the position and / or movement of a piston, in particular a piston accumulator, and an improved cylinder assembly with a cylinder and with a movable along a longitudinal central axis of the cylinder piston, in particular a piston accumulator ,
- a beam of an almost monochromatic wave is directed onto the second side of the bulb at an angle deviating from 90.degree. And reflected by the latter, and the location of the impact of the reflected beam is detected. Due to the angle of incidence, which may vary, for example, between 0.5 and 10 ° from a right angle, a piston movement is reliably detected by changing the location of the impact of the reflected beam.
- a particular advantage of the method according to the invention is that it does not require a sealing arrangement for sealing moving parts, such as piston rods or ropes. It is also advantageous that the method is applicable to the gas side of the piston. Thus, there is the possibility of creating a redudant operating system in which on the liquid side, for example, one of the aforementioned, belonging to the prior art systems for position and / or movement detection of the piston is used. In particular, the application of the ultrasonic path measuring system may be mentioned here.
- the used beam of a nearly monochromatic wave may be a laser beam.
- a change in the temperature of the gas present on the second piston side can also result in a change in the optical properties with the effects described in connection with a pressure change. Accordingly, alternatively or additionally, the temperature of the gas present on the second piston side is detected and the effects are taken into account with a suitable routine in the position and / or motion detection.
- the cylinder arrangement according to the invention which is preferably used to form a piston accumulator, comprises a radiation source, by means of which an applied beam of a nearly monochromatic wave can be directed onto the second piston side at an angle deviating from 90 °.
- a reflection device for example a mirror, is provided on the latter. If the mirror is aligned perpendicular to the longitudinal central axis of the cylinder, the radiation source is preferably designed such that the emitted beam is aligned at an acute angle to the direction of the longitudinal central axis, preferably between 0.5 ° and 10 °.
- the cylinder arrangement further comprises a detection device, by means of which the location of the impact of the reflected beam can be detected.
- the radiation source and the detection device may in particular be provided on one, the cylinder volume on the lid bounding the second piston side.
- the radiation source is preferably a laser source.
- the detection device preferably comprises an area sensor, which - particularly preferably - with respect to its sensitivity to the properties of the monochromatic wave, in particular the wavelength and the intensity of the reflected beam, is tuned.
- a gas pressure detection device In order to be able to take into account the influence of a possible gas pressure change on the position and / or movement detection, a gas pressure detection device is provided.
- a temperature detection device is alternatively or additionally provided.
- the cylinder arrangement according to the invention comprises an evaluation device for taking into account the influence of the pressure and / or the temperature on the location of the impact of the reflected beam in the position and / or movement detection of the piston, which comprises corresponding correction routines.
- correction routines may include correction functions that are computationally and / or empirically determined and take into account the influence of a pressure and / or temperature change on the location of the impact of the reflected beam at a specific position of the piston.
- a further device for position and / or movement detection the piston is provided, which detects in particular electrically, electromagnetically, acoustically and / or mechanically the piston position and / or movement.
- This second device may be an initially described, belonging to the prior art.
- the embodiment of a cylinder arrangement shown in the drawing comprises a cylinder 1 with a longitudinal center axis L.
- a piston 2 is provided, which is displaceable along the longitudinal central axis L.
- the piston comprises sealing means not shown in the drawing in a conventional manner, such as piston rings, to effect a sealing effect between an outer periphery and the inner periphery of the cylinder 1.
- the piston On the right side in the drawing, the piston has a recess 3, whereas the side of the piston shown on the left in the drawing just trained.
- the side shown on the left in the drawing forms a first piston side 4, to which a liquid, for example an oil or a water-glycol mixture, is present during operation of the cylinder arrangement as piston accumulator.
- the thus formed liquid volume 5 of the cylinder 1 is limited to the outside by a first cover 6.
- the latter has a central connection bore 7 for connecting a hydraulic device, not shown in the drawing.
- the liquid volume 5 is regularly completely filled with liquid.
- a gas volume 10 is delimited between the second piston side 8 opposite the first piston side 4 and a second cover 9 and the cylinder 1. This is in the operation of the piston-cylinder assembly regularly with pressurized nitrogen, if it is the liquid is oil, or filled with air, when the liquid is water-glycol mixture.
- an arrangement 11 comprising a radiation source 12, by means of which a beam of a nearly monochromatic wave on the second piston side 8 can be directed, and a detection device 13, by means of which the location of the impingement of the reflected beam can be detected, arranged.
- the detection direction may include an area sensor.
- a gas pressure detecting means 14 and a temperature detecting means 15 are provided which detect the pressure and the temperature of the gas in the gas volume 10 located.
- the arrangement 11 is electrically connected to a device 16 for driving the radiation source 12 and for reading the detection device 13.
- the gas pressure detection device 14 is electrically connected to a signal converter 17, the temperature detection device 15 to a signal converter 18.
- a signal processing device 19 which, taking into account pressure and temperature correction functions from the signals obtained from the device 16 at a first output 20, the actual position of the piston 2 in the cylinder 1 and a second output 21 emits a signal which is generated at a movement of the piston 2 from a rest position.
- Fig. 2 shows the piston 2 in a displaced from the middle to the first cover 6 position, with the aid of the radiation source 12, a beam of a nearly monochromatic wave, here a laser beam 22 is emitted to the second piston side 8.
- the second piston side 8 is provided with a mirror 23 which is aligned at least almost perpendicular to the central longitudinal axis L. Since the load beam 22 impinges on the mirror 23 at an angle oblique to the direction of the longitudinal central axis L, the reflected beam 24 is reflected to the detection device 13 at a corresponding angle of departure of opposite sign.
- the gas volume 10 is separated from the device 11 by a glass pane inserted from outside into a stepped bore 25. Between the step of the bore and the glass sheet is a seal 27 is inserted. against this seal, the glass sheet is pressed by means of a threaded sleeve 28 which is screwed into a threaded bore 29.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Claims (6)
- Procédé de détection de la position et/ou du mouvement d'un piston (2) dans un cylindre (1) présentant un axe médian longitudinal (L) dans lequel un liquide est présent au niveau d'une première face du piston (4) et un gaz est présent au niveau d'une seconde face du piston (8), dans lequel,
sous un angle d'irradiation différent de 90°, en direction de l'axe médian longitudinal (L), un rayon (22) d'une onde pratiquement monochromatique est irradié sur la seconde face du piston (8), réfléchi par celle-ci et l'emplacement de l'incidence (P) du rayon réfléchi (24) est détecté, caractérisé en ce que la pression du gaz présent au niveau de la seconde face du piston (8) est détectée, et que la température du gaz présent au niveau de la seconde face du piston (8) est détectée, et qu'il est tenu compte de l'influence de la pression du gaz et/ou de la température sur l'emplacement de l'incidence (P) du rayon réfléchi (24) lors de la détection de position et/ou de mouvement du piston (2). - Procédé selon la revendication 1, caractérisé en ce que le rayon (22) d'une onde pratiquement monochromatique est un rayon laser.
- Dispositif à cylindre comportant un cylindre (1) et un piston (2) mobile dedans le long de l'axe médian longitudinal (L) du cylindre (1), lequel dispositif est apte à séparer du gaz présent sur une première face du piston (4) d'un gaz présent sur une seconde face du piston (8),
dans lequel
le dispositif à cylindre comprend une source de rayons (12) au moyen de laquelle un rayon (22) d'une onde pratiquement monochromatique peut être dirigé sous un angle différent de 90° sur la seconde face du piston (8),
et la seconde face du piston (8) présente un dispositif de réflexion du rayon,
et le dispositif à cylindre comprend un dispositif de détection (13) au moyen duquel l'emplacement de l'incidence (P) du rayon réfléchi (24) est détectable, caractérisé en ce qu'un dispositif de détection de pression de gaz (14) permettant de détecter la pression du gaz présent au niveau de la seconde face du piston (8) est prévu, et/ou qu'un dispositif de détection de température (15) permettant de détecter la température du gaz présent au niveau de la seconde face du piston (8) est prévu et qu'un dispositif d'exploitation permettant de tenir compte de l'influence de la pression et/ou de la température sur l'emplacement de l'incidence (P) du rayon réfléchit (24) lors de la détection de position et/ou de mouvement du piston (2) est prévu. - Dispositif à cylindre selon la revendication 3, caractérisé en ce que la source de rayons (12) est une source de laser.
- Dispositif à cylindre selon la revendication 3 ou 4, caractérisé en ce que le dispositif de détection (13) présente un capteur de surface qui est de préférence conçu en fonction des propriétés de l'onde monochromatique en ce qui concerne sa sensibilité.
- Dispositif à cylindre selon une des revendications 3 à 5, caractérisé en ce qu'un second dispositif de détection de position et/ou de mouvement est prévu et détecte de préférence la position et/ou le mouvement du piston par système électrique, électromagnétique, acoustique et/ou mécanique.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014105154.8A DE102014105154A1 (de) | 2014-04-11 | 2014-04-11 | Verfahren zur Positions- und/oder Bewegungserfassung eines Kolbens in einem Zylinder sowie Zylinderanordnung |
PCT/EP2015/057726 WO2015155290A1 (fr) | 2014-04-11 | 2015-04-09 | Procédé de détection de position et/ou de mouvement d'un piston dans un cylindre et dispositif cylindrique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3129661A1 EP3129661A1 (fr) | 2017-02-15 |
EP3129661B1 true EP3129661B1 (fr) | 2018-07-11 |
Family
ID=52988033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15717128.1A Not-in-force EP3129661B1 (fr) | 2014-04-11 | 2015-04-09 | Methode pour acquisition de la position ou mouvement d'un piston dans un cylindre |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP3129661B1 (fr) |
JP (1) | JP6661604B2 (fr) |
DE (1) | DE102014105154A1 (fr) |
DK (1) | DK3129661T3 (fr) |
ES (1) | ES2687295T3 (fr) |
WO (1) | WO2015155290A1 (fr) |
ZA (1) | ZA201606800B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019207533A1 (de) * | 2019-05-23 | 2020-11-26 | Robert Bosch Gmbh | Kolbenspeicher mit Füllstandsmessung |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3475583B1 (fr) | 2016-06-25 | 2023-06-07 | Hydac Technology GmbH | Accumulateur hydropneumatique à piston |
DE102016007824A1 (de) | 2016-06-25 | 2017-12-28 | Hydac Technology Gmbh | Hydropneumatischer Kolbenspeicher |
DE102016007798A1 (de) * | 2016-06-25 | 2017-12-28 | Hydac Technology Gmbh | Hydropneumatischer Kolbenspeicher |
DE102021107886A1 (de) | 2021-03-29 | 2022-09-29 | Weber-Hydraulik Gmbh | Zylinder/Kolben-Aggregat mit Wegmesssystem |
DE102021002023A1 (de) | 2021-04-17 | 2022-10-20 | Hydac Technology Gmbh | Hydrospeicher |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS596465A (ja) * | 1982-06-30 | 1984-01-13 | Hitachi Constr Mach Co Ltd | 測長器付シリンダ |
US4643577A (en) * | 1983-07-15 | 1987-02-17 | Wero Ohg Roth & Co. | Length measuring apparatus based on the dual laser beam interferometer principle |
DE9012280U1 (de) * | 1990-07-16 | 1990-10-18 | Hommelwerke GmbH, 7730 Villingen-Schwenningen | Durch ein Druckmittel betätigte Kolben-Zylinder-Anordnung |
US6473189B1 (en) * | 1999-08-09 | 2002-10-29 | Caterpillar Inc | Apparatus and method for determining a distance to a reflective surface |
US6484620B2 (en) * | 2000-12-28 | 2002-11-26 | Case Corporation | Laser based reflective beam cylinder sensor |
US6710327B2 (en) * | 2001-06-04 | 2004-03-23 | Case, Llc | Multi-fiber multi-cylinder position method and apparatus using time-of-flight technique |
US7059238B2 (en) * | 2003-10-17 | 2006-06-13 | Clark Equipment Company | Method and apparatus for stroke position sensor for hydraulic cylinder |
US7478489B2 (en) * | 2006-06-01 | 2009-01-20 | Deere & Company | Control system for an electronic float feature for a loader |
US7934561B2 (en) * | 2007-04-10 | 2011-05-03 | Intermoor, Inc. | Depth compensated subsea passive heave compensator |
DE102011007765A1 (de) * | 2011-04-20 | 2012-10-25 | Robert Bosch Gmbh | Kolbenspeicher mit Vorrichtung zur Positionsbestimmung eines in dem Kolbenspeicher verlagerbaren Trennelementes |
-
2014
- 2014-04-11 DE DE102014105154.8A patent/DE102014105154A1/de not_active Ceased
-
2015
- 2015-04-09 JP JP2017504265A patent/JP6661604B2/ja not_active Expired - Fee Related
- 2015-04-09 ES ES15717128.1T patent/ES2687295T3/es active Active
- 2015-04-09 DK DK15717128.1T patent/DK3129661T3/da active
- 2015-04-09 EP EP15717128.1A patent/EP3129661B1/fr not_active Not-in-force
- 2015-04-09 WO PCT/EP2015/057726 patent/WO2015155290A1/fr active Application Filing
-
2016
- 2016-10-03 ZA ZA2016/06800A patent/ZA201606800B/en unknown
Non-Patent Citations (1)
Title |
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None * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019207533A1 (de) * | 2019-05-23 | 2020-11-26 | Robert Bosch Gmbh | Kolbenspeicher mit Füllstandsmessung |
Also Published As
Publication number | Publication date |
---|---|
JP2017514150A (ja) | 2017-06-01 |
ZA201606800B (en) | 2019-02-27 |
JP6661604B2 (ja) | 2020-03-11 |
ES2687295T3 (es) | 2018-10-24 |
DK3129661T3 (da) | 2018-09-24 |
DE102014105154A1 (de) | 2015-10-15 |
WO2015155290A1 (fr) | 2015-10-15 |
EP3129661A1 (fr) | 2017-02-15 |
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