EP2417364A1 - Positionsmesseinrichtung zur erfassung der position wenigstens eines stellglieds eines fluidischen systems ohne positionssensor - Google Patents
Positionsmesseinrichtung zur erfassung der position wenigstens eines stellglieds eines fluidischen systems ohne positionssensorInfo
- Publication number
- EP2417364A1 EP2417364A1 EP10722606A EP10722606A EP2417364A1 EP 2417364 A1 EP2417364 A1 EP 2417364A1 EP 10722606 A EP10722606 A EP 10722606A EP 10722606 A EP10722606 A EP 10722606A EP 2417364 A1 EP2417364 A1 EP 2417364A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure sensor
- measuring device
- actuator
- position measuring
- volume flow
- 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
- 238000005259 measurement Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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
- F15B15/2838—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT with out using position sensors, e.g. by volume flow measurement or pump speed
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/632—Electronic controllers using input signals representing a flow rate
- F15B2211/6326—Electronic controllers using input signals representing a flow rate the flow rate being an output member flow rate
Definitions
- Position measuring device for detecting the position of at least one actuator of a fluidic system without position sensor
- the invention relates to a position measuring device for detecting the position of at least one actuator of a fluidic system without a position sensor.
- Position sensors and position measuring systems for controlling movements in fluidic systems, in particular working cylinders are known in many variations and are indispensable for process control. Under certain conditions, e.g. at very high temperatures, the use of position sensors and position measuring systems is very problematic and costly. Even if there are no high temperatures, position sensors and position measuring systems represent a cost factor that should be kept as low as possible, in particular if the measurement accuracy is not too high.
- An object of the present invention is to provide a position measuring device for detecting the position of at least one actuator of a fluidic system, can be dispensed with the position sensors or WegmessSysteme.
- the position-measuring device has the advantage that any position sensors or displacement measuring systems can be dispensed with and the position or positions can be determined indirectly via the detection of flow or volumetric flow and pressure. Therefore, the sensor system need not be arranged along the stroke path of the actuator, but may be arranged in the supply line to the fluidic system, so also externally, wherein the geometric position is variable. This allows a more variable geometric design of the arrangement with less cabling. By replacing position sensors or displacement measuring systems with cheaper flow and pressure sensors, the costs for position detection can be reduced.
- the fluidic system is in particular a pneumatic system which is operated with compressed air.
- volume flow and pressure sensor device has proven to be particularly advantageous as a measuring module, in particular as a surface-mounted or built-in module.
- a measuring module can be mounted in a simple manner on or in the fluidic system or on or in the at least one control valve in a variable manner.
- the volume flow and pressure sensor device can advantageously be arranged on or in one of the covers of the actuator or on the outside thereof.
- valve battery If a plurality of control valves form a valve battery, then this can expediently be provided with one or more volumetric flow and pressure sensor devices, in particular in the form of modules.
- the volume flow and pressure sensor device may also be advantageously assigned to a plurality of fluid-actuated actuators as a fluidic system. This proves to be particularly advantageous when the controller has means for temporally assigning the detected measurement signals of the volume flow and pressure sensor device to the actuated actuator in each case, so that the positions of the actuators of a plurality of actuators are detected with a volume flow and pressure sensor device can be.
- the at least one fluid-actuated actuator is, for example, a linear drive, for example a working cylinder, or a rotary drive.
- a linear drive for example a working cylinder, or a rotary drive.
- FIG. 1 shows a schematic view of a working cylinder controlled by a control valve, wherein a volumetric flow and pressure sensor device is arranged in one of the supply lines to the working cylinder,
- FIG. 2 shows an arrangement of two module-like volume flow and pressure sensor devices on a valve battery
- Figure 3 shows the arrangement of a volume flow and pressure sensor device in the cylinder cover of a working cylinder.
- a fluidic working cylinder 10 is controlled by a pressure source 11 having a pressure P via a valve assembly 12, which may be, for example, a 5/3 way valve or by two separate valves which are connected in the two supply lines 13, 14 to the two chambers of the fluidic working cylinder 10.
- a valve assembly 12 which may be, for example, a 5/3 way valve or by two separate valves which are connected in the two supply lines 13, 14 to the two chambers of the fluidic working cylinder 10.
- throttle check valves 15, 16 are connected, which represent expedient embodiments, but are not mandatory.
- one of the two leads 13 is also designed as a measuring module volume flow and
- Pressure sensor device 17 is connected, through which the guided to the corresponding working chamber of the working cylinder 10 or recirculated volume flow QN and the respective pressure p is measured.
- the measured values QN and p of the volume flow and pressure sensor device 17 are fed to a controller 18, which may be designed as an external control center or as an individually assigned control device. Feeding can be wired or wireless. In this controller 18, from the measured values QN and p according to the relationship
- A is the pressurizable area of the actuator 19, that is, the piston of the working cylinder 10
- QK is the compression flow proportional to the actuator volume and the pressure change according to the relationship
- V is the volume consisting of the dead volume, that is the volume of lines, hoses and the like, and the stroke-dependent cylinder volume.
- K P i and K P 2 are pressure-dependent correction factors for the volume flow QN and the compression flow Qk. These correction factors take into account the actual pressure as well as temperature / heat effects which are taken into account with a polytropic coefficient. This coefficient is automatically determined by the size of the pressure, the pressure change and the traversing speed of the cylinder. The calculated position value x results from the integral of the piston speed, so that this is also obtained in a simple manner by omitting the integration.
- the volumetric flow and pressure sensor device 17 can be used both during feeding and during discharge of pressure medium the associated supply line 13 are used. If the measurement takes place during the fluid feed, both correction factors are expediently taken into account as positive values. For a measurement during fluid removal, the two correction factors are expediently taken into account as negative values.
- the volume flow and pressure sensor device 17 can also be switched on in the other (14) of the two supply lines. It is also possible, at the same time, to switch on a separate volume flow pressure sensor device in all feed lines 13, 14, which are then expediently connected to one and the same controller 18.
- the determined position value x can be displayed and / or stored or recorded in a display and / or registration device 20.
- the measurements start from the control signal for the valve arrangement 12, through which a volume flow is initiated.
- the method can be made even more robust and simplified for pure end position determination by subjecting plausibility checks to pressure and volume flow patterns. For example, the measured values for pressure and volume flow at the beginning of the process are equal to zero. If the actuator 9 leaves an end position, pressure and flow rate reach their maximum. Upon reaching the opposite end position by the actuator 9, a final value is determined for the pressure, while the volume flow is zero.
- the volume flow and pressure sensor device 17 and additional diagnoses can be realized, for example, the detection of the switching time via the pressure sensor by the pressure rise time is measured.
- a valve arrangement 21 designed as a valve battery is shown as a fluidic system which consists of a multiplicity of plate valves 22 or other valves arranged side by side.
- Two of the plate valves 22 are each equipped with a volume flow and pressure sensor device 17 lo, which is mounted as an add-on module to the respective plate valve 22.
- each of the plate valves 22 may be provided with its own volume flow and pressure sensor device 17, wherein in addition to an installation, an installation can be realized.
- Measuring signals of a volume flow and pressure sensor device 17 are assigned to the respective active valve or plate valve 22 with a corresponding actuator. For this purpose, only a single volume flow and pressure sensor device 17 for
- valves or plate valves 22 may be provided, which is arranged in a common fluidic supply line.
- An appropriate evaluation with the switching matrix can be equal to integrated in the valve battery.
- 3o facilities 17 vary. If only the end positions are of interest, only the volumetric flow measuring signal can be evaluated for rough statements regarding the end positions then a pressure detection or a pressure sensor contained in the module is not required.
- FIG. 3 shows a portion of the fluidic working cylinder 10 with its piston as an actuator 19 enlarged.
- the working cylinder 10 has a cylinder tube 23 which is closed by a cover 24 at the illustrated end region.
- the volume flow and pressure sensor device 17 is integrated as a built-in module in this lid 24, designed in particular as a cylinder cover. Alternatively, it may also be externally attached to the cover 24 or outside of the cylinder tube 23 as a module.
- a fluidic working cylinder is shown as the fluidic system.
- the invention is also applicable to actuators other than fluidic systems, wherein a fluidic system can also have a plurality of actuators or working cylinders.
- the object of the present invention is the indirect position detection in fluidic systems or actuators, such as drives, cylinders and the like, by the use of volume flow and pressure sensor means. Advantages are the reduction of susceptibility, the reduction of commissioning - And cabling and a lower maintenance.
- the working cylinder 10 shown has a piston rod, but could also be formed rodless. Instead of the illustrated working cylinder 10, another fluid-actuated actuator could also be present, for example a rotary drive, a crust breaker cylinder, a handling device or a gripping device.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Measuring Fluid Pressure (AREA)
- Measuring Volume Flow (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009023168A DE102009023168A1 (de) | 2009-05-29 | 2009-05-29 | Positionsmesseinrichtung zur Erfassung der Position wenigstens eines Stellglieds eines fluidischen Systems ohne Positionssensor |
PCT/EP2010/002973 WO2010136131A1 (de) | 2009-05-29 | 2010-05-14 | Positionsmesseinrichtung zur erfassung der position wenigstens eines stellglieds eines fluidischen systems ohne positionssensor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2417364A1 true EP2417364A1 (de) | 2012-02-15 |
EP2417364B1 EP2417364B1 (de) | 2013-03-20 |
Family
ID=42670512
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10722606A Active EP2417364B1 (de) | 2009-05-29 | 2010-05-14 | Positionsmesseinrichtung zur erfassung der position wenigstens eines stellglieds eines fluidischen systems ohne positionssensor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2417364B1 (de) |
CN (1) | CN102483079B (de) |
DE (1) | DE102009023168A1 (de) |
WO (1) | WO2010136131A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2975089B1 (fr) | 2011-05-10 | 2013-04-26 | Manitou Bf | Dispositif de mesure de bras telescopique de manutention |
US9506225B2 (en) | 2011-10-11 | 2016-11-29 | Volvo Construction Equipment Ab | Actuator displacement measurement system in electronic hydraulic system of construction equipment |
DE102012202903A1 (de) * | 2012-02-27 | 2013-08-29 | Zf Friedrichshafen Ag | Verfahren zum Bestimmen eines Betriebszustandes eines formschlüssigen Schaltelementes einer Getriebeeinrichtung |
DE102012222074A1 (de) * | 2012-12-03 | 2014-06-05 | Pleiger Maschinenbau Gmbh & Co. Kg | Verfahren und vorrichtung zur stellungsanzeige von hydraulisch betätigten armaturen |
DE102014004879B4 (de) | 2014-04-04 | 2022-02-17 | Festo Se & Co. Kg | Aktor, Fluidantriebssystem und Verfahren zur Ermittlung einer Position eines Arbeitskolbens |
DE102014004877B3 (de) * | 2014-04-04 | 2015-09-17 | Festo Ag & Co. Kg | Antriebssystem und Verfahren zum Betreiben eines Antriebssystems |
DE102014004876B3 (de) * | 2014-04-04 | 2015-09-17 | Festo Ag & Co. Kg | Antriebssystem und Verfahren zum Betreiben eines Antriebssystems |
DE102016122632A1 (de) * | 2016-11-23 | 2018-05-24 | Bizerba SE & Co. KG | Vorrichtung zum Aussondern eines Artikels |
CN107939785B (zh) * | 2017-11-21 | 2019-09-20 | 中国兵器装备集团自动化研究所 | 一种用于气缸动作控制方法 |
DE102019211880A1 (de) * | 2019-08-07 | 2021-02-11 | Tadano Faun Gmbh | Verfahren zum Bestimmen eines Hubwegs eines Teleskopiersystems, Teleskopausleger für einen Kran und Kran |
CN112855632B (zh) * | 2019-11-12 | 2024-03-01 | 许继电气股份有限公司 | 充电装置及其电极控制系统 |
CN116892985B (zh) * | 2023-09-11 | 2023-11-21 | 瑞星久宇燃气设备(成都)有限公司 | 一种基于调压器流量特性的流量计量方法及系统 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4220333A1 (de) * | 1992-06-22 | 1993-12-23 | Marco Systemanalyse Entw | Verfahren zum Bestimmen des Kolbenweges in einem hydraulischen Arbeitszylinder |
AU2001245483A1 (en) * | 2000-03-08 | 2001-09-17 | Rosemount, Inc. | System for controlling hydraulic actuator |
WO2001066954A2 (en) * | 2000-03-08 | 2001-09-13 | Rosemount Inc. | Piston position measuring device |
DE10355250B4 (de) | 2003-11-26 | 2005-09-01 | Festo Ag & Co. | Verfahren und Vorrichtung zur Leckage-Ermittlung |
EP1812718B1 (de) * | 2004-11-19 | 2008-08-20 | Festo AG & Co. KG | Diagnosevorrichtung für wenigstens eine pneumatische ventil-aktuator-anordnung |
-
2009
- 2009-05-29 DE DE102009023168A patent/DE102009023168A1/de not_active Ceased
-
2010
- 2010-05-14 EP EP10722606A patent/EP2417364B1/de active Active
- 2010-05-14 CN CN201080024909.0A patent/CN102483079B/zh active Active
- 2010-05-14 WO PCT/EP2010/002973 patent/WO2010136131A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010136131A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102483079B (zh) | 2015-06-17 |
DE102009023168A1 (de) | 2010-12-02 |
WO2010136131A1 (de) | 2010-12-02 |
CN102483079A (zh) | 2012-05-30 |
EP2417364B1 (de) | 2013-03-20 |
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