WO1997014012A2 - Measurement system for sensing the position of a piston - Google Patents

Measurement system for sensing the position of a piston Download PDF

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Publication number
WO1997014012A2
WO1997014012A2 PCT/DE1996/001973 DE9601973W WO9714012A2 WO 1997014012 A2 WO1997014012 A2 WO 1997014012A2 DE 9601973 W DE9601973 W DE 9601973W WO 9714012 A2 WO9714012 A2 WO 9714012A2
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
piston
cylinder
detecting
drive
Prior art date
Application number
PCT/DE1996/001973
Other languages
German (de)
French (fr)
Other versions
WO1997014012A3 (en
Inventor
Detlev Schuckar
Manfred Wege
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to JP9514635A priority Critical patent/JP2000502178A/en
Priority to EP96945358A priority patent/EP0855014A2/en
Publication of WO1997014012A2 publication Critical patent/WO1997014012A2/en
Publication of WO1997014012A3 publication Critical patent/WO1997014012A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/48—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/02—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means
    • G01D5/06—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means acting through a wall or enclosure, e.g. by bellows, by magnetic coupling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/42—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using fluid means
    • G01D5/425—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using fluid means characterised by a first part whose movement represents the measuring value, and by a second part which is moved by an external force in order to follow the movement of the first part
    • 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 measuring system for detecting the position of a piston movable in a pressurizable cylinder.
  • Such a measuring system is known, for example, from the operating instructions for the Siemens 3AT2 high-voltage circuit breaker, pages 300/6 to 300/7.
  • a cylinder is described there in which a piston which seals on the cylinder wall slides and in which hydraulic oil is provided on one side of the piston and nitrogen in gaseous form on the other side of the piston.
  • the cylinder serves as an energy store for driving the switch and is charged with energy by injecting hydraulic oil and correspondingly compressing the nitrogen.
  • the pressure in the cylinder is checked by pressure switches and hydraulic oil is pumped in if necessary.
  • the amount of nitrogen present in the cylinder should remain constant and only pressure and temperature should change. If, however, nitrogen is lost through the non-ideal seals, a change in the position of the piston results at the same hydraulic pressure, which position is detected via several stationary proximity switches.
  • DE 92 18 883 U1 discloses a device for position determination in a pressure-operated working cylinder, in which a sensor responds to a movable position transmitter and the sensor can be displaced along the movement path of the position transmitter for adjustment purposes. In operation, however, the sensor only provides information as to whether the position transmitter is in its vicinity or not.
  • the present invention has for its object to provide a measuring system of the type mentioned with a to enable a precise and reliable position measurement.
  • a position sensor connected to the piston, a sensor which can be driven along the movement path of the position sensor outside the cylinder by means of a drive and which detects a signal strength as a function of its distance from the position sensor, a control device connected to the sensor, issues the commands to the drive and thereby sets the position of the sensor in which it detects a maximum signal strength, and a device for detecting the position of the sensor.
  • the sensor is moved along the cylinder by the control device by means of the drive until it detects a maximum signal strength and thus indicates that it has moved as close as possible to the position transmitter.
  • the position of the position transmitter in the cylinder can be inferred from the position of the sensor.
  • a possibly existing distance between the position transmitter and the sensor in the direction of movement of the piston with a maximum signal strength can first be measured to calibrate the measuring system without pressurizing the cylinder and later taken into account during measurements during operation.
  • One such simple verification option is in a system with a plurality of sensors which are fixed at a distance from one another and difficult to detect a position transmitter.
  • the position of the sensor can be measured very simply using conventional methods outside the cylinder which can be pressurized, for example by means of a resistance tap or by one of the devices described below.
  • the partial volume of the cylinder separated by the piston can be determined in a simple manner from the position of the position transmitter determined by means of the measuring system.
  • a temperature measurement sensor can be provided in the area of the cylinder, so that the temperature of the filling medium is also available as a measurement variable.
  • the partial volume can be filled, for example, with a gas, in particular with stiff substance, which serves as an energy store for a high-voltage circuit breaker.
  • the amount of nitrogen present in the volume or the number of molecules can then be determined with known constants or a reference amount of nitrogen relate substance.
  • the amount of gas still available in the cylinder can be determined and a decision can be made as to whether this is sufficient for storing the energy required to switch a high-voltage switch. If the gas quantity is no longer sufficient, for example a warning signal can be issued or the switch can be blocked or switched off.
  • the device for detecting the position of the sensor can advantageously be an evaluation device for detecting and evaluating Have evaluation of the control signals given by the control system to the drive and to determine the position of the piston from its initial position and the control signals.
  • control signals are usually already in the form of electrical signals and can be output directly to an evaluation device.
  • Detection of the activity of the drive and a device for determining the position of the piston from its starting position and the activity of the drive.
  • the device for recording the activity of the drive can be formed, for example, by a counter which counts the revolutions of the motor.
  • An advantageous embodiment of the invention provides that the position transmitter has a magnet and that the sensor is suitable for detecting magnetic fields.
  • Such magnetic fields can also be detected by means of sensitive sensors through relatively thick, metallic cylinder walls. This type of signal transmission is less susceptible to contamination and malfunction, particularly under the harsh operating conditions of a high-voltage circuit breaker. It can be guaranteed to work for years.
  • An ultrasound transmitter can also advantageously be provided for irradiating ultrasound signals into the cylinder, and in this case the sensor can be an ultrasound sensor. This also makes it possible to locate a position transmitter which is connected to a piston in the interior of a cylinder. In this case, a piston surface can already serve as the position transmitter, which forms a sharp reflection edge in the ultrasound image.
  • the invention also relates to a method for detecting the position of a piston which can be moved in a pressurizable cylinder, in which a position transmitter is connected to the piston and, by means of a control device, a sensor which is dependent on its distance from the Position transmitter detects a signal strength, is driven along the movement path of the position transmitter outside the cylinder by means of a drive in such a way that a position of the sensor is set at which it reaches a maximum
  • the invention also includes a method for detecting the amount of gas stored within a cylinder by means of the measuring system according to the invention, in which the position of the piston is first detected by means of the above-mentioned method and the gas volume is determined from the position of the piston and from the hydraulic pressure acting on the piston Gas pressure is determined and the temperature is measured, and that the quantity of gas inside the cylinder is determined from the quantities of pressure, temperature and volume and is related to a reference gas quantity.
  • FIG. 1 schematically shows the system according to the invention with a first device for detecting the position of the sensor
  • 2 shows the measuring system according to the invention with a second device for detecting the position of the sensor
  • FIG. 3 shows a further embodiment of the device for detecting the position of the sensor.
  • a first area 2 of the cylinder 1 is filled with a hydraulic oil.
  • the cylinder 1 has two connections 3, 4, a hydraulic pump 5 being connected to the one connection 3, which acts on the hydraulic oil with a certain, adjustable pressure of several bars.
  • the piston 6 moves within the cylinder 1 to make room for the hydraulic oil and thereby reduces the gas volume 7, which is filled with nitrogen, for example.
  • the gas pressure in the gas volume 7 essentially corresponds to the hydraulic pressure present, since the piston 6 is freely movable.
  • the piston 6 is sealed by means of seals 8, 9 on the inner wall of the cylinder 1.
  • the cylinder 1 has a further connection 4, to which a drive cylinder which is actuable by means of the hydraulic oil and which is not shown is connected. Hydraulic oil is drained from cylinder 1 suddenly via a valve to actuate the drive cylinder. The expanding compressible gas in the gas volume 7 serves as an energy store. Because of its extensive incompressibility, the hydraulic oil is hardly able for me to store energy to any appreciable extent.
  • a pressure switch 10 monitors the hydraulic pressure and controls the pump 5 to replenish hydraulic oil.
  • the number of gas molecules in the gas volume 7 can be determined from the volume, the prevailing pressure and the temperature with knowledge of the gas constant, taking into account the gas equation. Since the pressure is essentially with the aid of a pressure switch 10 Determinable and also the temperature measurable, all that remains is to determine the position of the piston 6 and thus the gas volume in order to then be able to calculate the amount of gas in the gas volume 7 from the given quantities.
  • a magnet 11 is attached to the piston 6 as a position transmitter, the magnetic field of which at least partially reaches through the wall of the cylinder 1 and is registered by a sensor 12.
  • the sensor 12 is on a spindle 13 by rotating the spindle 13 by means of a motor
  • the sensor 12 is in a holder
  • the sensor 12 can, for example, be a Hall sensor.
  • the sensor 12 By actuating the motor 14, the sensor 12 can be moved along the cylinder 1.
  • the intensity of the magnetic field can be measured continuously and thus an intensity distribution can be detected.
  • the highest magnetic field strength is measured at the position of the magnet 11.
  • a control device 17 which issues commands via a line 18 to the motor 14 and at the same time the respectively detected magnetic field intensity from the sensor 12 registered.
  • the motor is actuated until a maximum magnetic field intensity is registered by the sensor 12. In this situation it is assumed that the sensor 12 is exactly opposite the magnet 11 serving as a position transmitter.
  • the movement transmitted by the motor 14 is registered by a counter 19 attached to the motor 14 and the position of the sensor 12 can thus be read directly on the counter 19. As a result, the position is directly
  • Magnet 11 or de ⁇ piston 6 can be determined.
  • the gas temperature in the gas volume 7 can also be determined by means of a temperature sensor 20.
  • the variables volume, temperature of the gas and gas pressure and the type of gas are thus available for further determination of the gas quantity.
  • an automatic device can be provided, which is connected to a pressure switch 10, the temperature sensor 20 and the counter 19 of the engine and automatically inputs its measured values, and taking into account the given gas type-dependent constants determined and, if the gas quantity falls below a predetermined lower limit, issues a warning or blocks or switches off the high-voltage circuit breaker.
  • FIGS. 2 and 3 elements that are already shown in the same form in FIG. 1 are provided with the same reference symbols.
  • the position of sensor 2 is regulated in the same way as in the embodiment according to FIG. 1.
  • the position of the sensor 12 is not registered on the motor 14 via a counter, but rather by means of a commercially available ultrasonic distance measuring device 21 which is arranged on the cylinder 1 and which detects the distance. determined to the sensor 12 or to the bracket 15 and provides for further determination of the amount of gas.
  • the position of the sensor 12 is not carried out by measuring the sensor itself, but rather by registering the commands directed to the motor 14.
  • an evaluation device 22 is provided for detecting and evaluating the control signals output by the control system 17 to the drive, in which the respective position of the sensor 12 is determined from the control signals and is available for a further determination of the gas quantity in the gas volume 7 is provided.
  • the motor 14 can be a stepper motor, for example, which is rotated further by a defined angle by means of individual actuating pulses. With such a stepper motor, a particularly precise control of the sensor 12 and a reliable registration of the movement and corresponding detection of the position of the sensor 12 are possible.

Abstract

In a measurement system for sensing the position of a piston (6) capable of moving within a cylinder (1) to which a pressure may be applied, a position transmitter (11), for example a magnet, is linked to the piston (6) inside the cylinder (1), and a sensor (12) that may be driven outside the cylinder (1) by a drive (13, 14) along the path of displacement of the position transmitter (11) senses a signal intensity depending on its distance from the position transmitter (11). The sensor (12) is driven by a regulator (17) in such a way that it presents a maximum signal intensity. By detecting the position of the sensor (12), the position of the position transmitter (11) may be deducted.

Description

Beschreibungdescription
Meßsystem zur Erfassung der Position eines KolbensMeasuring system for detecting the position of a piston
Die Erfindung bezieht sich auf ein Meßsystem zur Erfassung der Position eines in einem druckbeaufschlagbaren Zylinder bewegbaren Kolbens.The invention relates to a measuring system for detecting the position of a piston movable in a pressurizable cylinder.
Ein solches Meßsystem ist beispielsweise aus der Betriebsan- leitung zu dem Siemens-Hochspannungs-Leistungsschalter 3AT2, Seite 300/6 bis 300/7 bekannt. Dort ist ein Zylinder be¬ schrieben, in dem ein an der Zylinderwand dichtender Kolben gleitet und in dem auf einer Seite des Kolbens Hydrauliköl und auf der anderen Seite des Kolbens Stickstoff in Gasform vorgesehen ist. Der Zylinder dient als Energiespeicher für den Antrieb des Schalters und wird durch Einpressen von Hy¬ drauliköl und entsprechendes Komprimieren des Stickstoffs mit Energie aufgeladen. Der in dem Zylinder herrschende Druck wird über Druckwächter kontrolliert und ggf. wird Hydrauliköl nachgepumpt. Die Stickstoffmenge, die in dem Zylinder vorhan¬ den ist, soll konstant bleiben und es sollen sich nur Druck und Temperatur ändern. Geht jedoch Stickstoff durch die nicht idealen Dichtungen verloren, so ergibt sich bei gleichem Hy¬ draulikdruck eine veränderte Stellung des Kolbens, die über mehrere ortsfeste Näherungsschalter erfaßt wird.Such a measuring system is known, for example, from the operating instructions for the Siemens 3AT2 high-voltage circuit breaker, pages 300/6 to 300/7. A cylinder is described there in which a piston which seals on the cylinder wall slides and in which hydraulic oil is provided on one side of the piston and nitrogen in gaseous form on the other side of the piston. The cylinder serves as an energy store for driving the switch and is charged with energy by injecting hydraulic oil and correspondingly compressing the nitrogen. The pressure in the cylinder is checked by pressure switches and hydraulic oil is pumped in if necessary. The amount of nitrogen present in the cylinder should remain constant and only pressure and temperature should change. If, however, nitrogen is lost through the non-ideal seals, a change in the position of the piston results at the same hydraulic pressure, which position is detected via several stationary proximity switches.
Aus der DE 92 18 883 Ul ist eine Einrichtung zur Positionser¬ mittlung bei einem druckmittelbetriebenen Arbeitszylinder be¬ kannt, bei der ein Sensor auf einen beweglichen Positionsge- ber anspricht und der Sensor längs der Bewegungsbahn des Po¬ sitionsgebers zu Justagezwecken verschiebbar ist. Der Sensor gibt im Betrieb jedoch nur eine Information darüber, ob sich der Positionsgeber in seiner Nähe befindet oder nicht.DE 92 18 883 U1 discloses a device for position determination in a pressure-operated working cylinder, in which a sensor responds to a movable position transmitter and the sensor can be displaced along the movement path of the position transmitter for adjustment purposes. In operation, however, the sensor only provides information as to whether the position transmitter is in its vicinity or not.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei einem Meßsystem der eingangs genannten Art mit einem mög- liehst geringen konstruktiven Aufwand und geringen Kosten ei¬ ne genaue und zuverlässige Positionsmessung zu ermöglichen.The present invention has for its object to provide a measuring system of the type mentioned with a to enable a precise and reliable position measurement.
Die Aufgabe wird erfindungsgemäß gelöst durch einen mit dem Kolben verbundenen Positionsgeber, einen entlang der Bewe¬ gungsbahn des Positionsgebers außerhalb des Zylinders mittels eines Antriebs antreibbaren Sensors, der in Abhängigkeit von seiner Entfernung zu dem Positionsgeber eine Signalstärke erfaßt, eine mit dem Sensor verbundene Regeleinrichtung, die Befehle an den Antrieb abgibt und hierdurch die Position des Sensors einstellt, in der dieser eine maximale Signalstärke erfaßt, und eine Vorrichtung zur Erfassung der Position des Sensors .The object is achieved according to the invention by a position sensor connected to the piston, a sensor which can be driven along the movement path of the position sensor outside the cylinder by means of a drive and which detects a signal strength as a function of its distance from the position sensor, a control device connected to the sensor, issues the commands to the drive and thereby sets the position of the sensor in which it detects a maximum signal strength, and a device for detecting the position of the sensor.
Der Sensor wird durch die Regeleinrichtung mittels des An¬ triebs solange an dem Zylinder entlang bewegt, bis daß er ei¬ ne maximale Signalstärke nachweist und damit anzeigt, daß er bis auf den nächstmöglichen Abstand an den Positionsgeber herangerückt ist .The sensor is moved along the cylinder by the control device by means of the drive until it detects a maximum signal strength and thus indicates that it has moved as close as possible to the position transmitter.
In dieser Stellung kann aus der Position des Sensors auf die Position des Positionsgebers in dem Zylinder geschlossen wer¬ den. Ein eventuell vorhandener Abstand zwischen Positions¬ geber und Sensor in Bewegungsrichtung des Kolbens bei maxima- 1er Signalstärke kann zur Eichung des Meßsystems zunächst ohne Druckbeaufschlagung des Zylinders ausgemessen und später im Betrieb bei Messungen berücksichtigt werden.In this position, the position of the position transmitter in the cylinder can be inferred from the position of the sensor. A possibly existing distance between the position transmitter and the sensor in the direction of movement of the piston with a maximum signal strength can first be measured to calibrate the measuring system without pressurizing the cylinder and later taken into account during measurements during operation.
Durch die erfindungsgemäße Konstruktion wird nur ein einziger Sensor benötigt und die Position des Kolbens kann dennoch sehr genau erfaßt werden. Es ergibt sich auch zwanglos eine automatische Funktionsprüfung des Sensors, da dieser in jeder Stellung des Kolbens in eine Position gefahren werden kann, in der er Signale empfängt. Wenn der Sensor trotz seiner Be- wegung entlang der Bewegungsbahn des Positionsgebers keineDue to the construction according to the invention, only a single sensor is required and the position of the piston can nevertheless be detected very precisely. An automatic functional test of the sensor also results, since it can be moved to a position in any position of the piston in which it receives signals. If the sensor does not move in spite of its movement along the movement path of the position sensor
Signale nachweist, so ist dies ein Hinweis auf einen Funkti- onsmangel . Eine solche einfache Überprüfungsmöglichkeit ist bei einem System mit mehreren im Abstand voneinander festste¬ henden Sensoren zur Erfassung eines Positionsgebers schwieri¬ ger.If signals are detected, this is an indication of a lack of functionality. One such simple verification option is in a system with a plurality of sensors which are fixed at a distance from one another and difficult to detect a position transmitter.
Die Messung der Position des Sensors ist mit herkömmlichen Methoden außerhalb des druckbeaufschlagbaren Zylinders sehr einfach möglich, beispielsweise mittels eines Widerstandsab¬ griffs oder durch eine der im folgenden beschriebenen Vor¬ richtungen.The position of the sensor can be measured very simply using conventional methods outside the cylinder which can be pressurized, for example by means of a resistance tap or by one of the devices described below.
Aus der mittels des Meßsystems bestimmten Position des Posi¬ tionsgebers kann auf einfache Weise das durch den Kolben ab¬ getrennte Teilvolumen des Zylinders bestimmt werden. Es kann im Bereich des Zylinders ein Temperaturmeßsensor vorgesehen sein, so daß auch die Temperatur des Füllmediums als Meßgröße zur Verfügung steht.The partial volume of the cylinder separated by the piston can be determined in a simple manner from the position of the position transmitter determined by means of the measuring system. A temperature measurement sensor can be provided in the area of the cylinder, so that the temperature of the filling medium is also available as a measurement variable.
Das Teilvolumen kann beispielsweise mit einem Gas, insbeson¬ dere mit Stiffstoff gefüllt sein, das als Energiespeicher für eien Hochspannungs-Leistungsschalter dient.The partial volume can be filled, for example, with a gas, in particular with stiff substance, which serves as an energy store for a high-voltage circuit breaker.
Aus dem Volumen, der Temperatur und dem Druck des Stick¬ stoffs, der im wesentlichen dem anstehenden Hydraulikdruck entspricht, läßt sich dann mit bekannten Konstanten die Menge des in dem Volumen vorhandenen Stickstoffs bzw. die Anzahl der Moleküle bestimmen oder zu einer Referenzmenge von Stick¬ stoff in Beziehung setzen. Auf diese Weise kann beispielswei¬ se mittels einer Auswerteinrichtung die noch in dem Zylinder zur Verfügung stehende Gasmenge ermittelt und entschieden werden, ob diese für die Speicherung der zum Schalten eines Hochspannungsschalters notwendigen Energie ausreicht. Reicht die Gasmenge nicht mehr aus, so kann beispielsweise ein Warnsignal abgegeben oder der Schalter gesperrt oder ausge¬ schaltet werden.From the volume, the temperature and the pressure of the nitrogen, which essentially corresponds to the hydraulic pressure present, the amount of nitrogen present in the volume or the number of molecules can then be determined with known constants or a reference amount of nitrogen relate substance. In this way, for example by means of an evaluation device, the amount of gas still available in the cylinder can be determined and a decision can be made as to whether this is sufficient for storing the energy required to switch a high-voltage switch. If the gas quantity is no longer sufficient, for example a warning signal can be issued or the switch can be blocked or switched off.
Die Vorrichtung zur Erfassung der Position des Sensors kann vorteilhaft eine Auswerteeinrichtung zur Erfassung und Aus- Wertung der von dem Regelsystem an den Antrieb abgegebenen Stellsignale und zur Bestimmung der Position des Kolbens aus dessen Ausgangsstellung und den Stellsignalen aufweisen.The device for detecting the position of the sensor can advantageously be an evaluation device for detecting and evaluating Have evaluation of the control signals given by the control system to the drive and to determine the position of the piston from its initial position and the control signals.
Die Stellsignale liegen üblicherweise bereits in Form von elektrischen Signalen vor und können an eine Auswerteeinrich¬ tung direkt abgegeben werden.The control signals are usually already in the form of electrical signals and can be output directly to an evaluation device.
Es kann auch vorteilhaft vorgesehen sein, daß die Vorrichtung zur Erfassung der Position des Sensors eine Einrichtung zurIt can also be advantageously provided that the device for detecting the position of the sensor has a device for
Erfassung der Aktivität des Antriebs und eine Einrichtung zur Bestimmung der Position des Kolbens aus dessen Ausgangsstel¬ lung und der erfolgten Aktivität des Antriebs aufweist.Detection of the activity of the drive and a device for determining the position of the piston from its starting position and the activity of the drive.
Die Einrichtung zur Erfassung der Aktivität des Antriebs kann beispielsweise, wenn der Antrieb einen rotierenden Motor auf¬ weist, durch ein Zählwerk gebildet sein, das die Umdrehungen des Motors zählt.If the drive has a rotating motor, the device for recording the activity of the drive can be formed, for example, by a counter which counts the revolutions of the motor.
Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, daß der Positionsgeber einen Magneten aufweist und daß der Sensor zum Nachweis von magnetischen Feldern geeignet ist.An advantageous embodiment of the invention provides that the position transmitter has a magnet and that the sensor is suitable for detecting magnetic fields.
Solche magnetischen Felder lassen sich mittels sensibler Sen- soren auch durch relativ dicke, metallische Zylinderwände nachweisen. Diese Art der Signalύbertragung ist besonders un¬ ter den harten Einsatzbedingungen eines Hochspannungs-Lei¬ stungsschalters wenig verschmutzungs- und störungsanfällig. Es kann ein Funktionieren über Jahre hinaus gewährleistet werden.Such magnetic fields can also be detected by means of sensitive sensors through relatively thick, metallic cylinder walls. This type of signal transmission is less susceptible to contamination and malfunction, particularly under the harsh operating conditions of a high-voltage circuit breaker. It can be guaranteed to work for years.
Es kann auch vorteilhaft ein Ultraschallsender zur Einstrah¬ lung von Ultraschallsignalen in den Zylinder vorgesehen sein und der Sensor kann in diesem Fall ein Ultraschallsensor sein. Auch hierdurch ist die Lokalisierung eines Positionsgebers möglich, der im Inneren eines Zylinders mit einem Kolben ver¬ bunden ist. Als Positionsgeber kann in diesem Fall bereits eine Kolbenfläche dienen, die im Ultraschallbild eine scharfe Reflexionskante bildet.An ultrasound transmitter can also advantageously be provided for irradiating ultrasound signals into the cylinder, and in this case the sensor can be an ultrasound sensor. This also makes it possible to locate a position transmitter which is connected to a piston in the interior of a cylinder. In this case, a piston surface can already serve as the position transmitter, which forms a sharp reflection edge in the ultrasound image.
Die Erfindung bezieht sich außerdem auf ein Verfahren zur Er¬ fassung der Position eines in einem druckbeaufschlagbaren Zy¬ linder bewegbaren Kolbens, bei dem mit dem Kolben ein Positi- onsgeber verbunden ist und mittels einer Regeleinrichtung ein Sensor, der in Abhängigkeit von seiner Entfernung zu dem Po¬ sitionsgeber eine Signalstärke erfaßt, entlang der Bewe¬ gungsbahn deε Positionsgebers außerhalb des Zylinders mittels eines Antriebs derart angetrieben wird, daß eine Position des Sensors eingestellt wird, an der dieser eine maximaleThe invention also relates to a method for detecting the position of a piston which can be moved in a pressurizable cylinder, in which a position transmitter is connected to the piston and, by means of a control device, a sensor which is dependent on its distance from the Position transmitter detects a signal strength, is driven along the movement path of the position transmitter outside the cylinder by means of a drive in such a way that a position of the sensor is set at which it reaches a maximum
Signalstärke mißt und daß danach die Position des Sensors erfaßt und hieraus die Position des Kolbens bestimmt wird.Measures signal strength and that the position of the sensor is then detected and from this the position of the piston is determined.
Die Erfindung umfaßt außerdem ein Verfahren zur Erfassung der innerhalb eines Zylinders gespeicherten Gasmenge mittels des erfindungsgemäßen Meßssystems, bei dem zunächst mittels des obengenannten Verfahrens die Position des Kolbens erfaßt wird und aus der Position des Kolbens das Gasvolumen bestimmt und aus dem auf den Kolben wirkenden Hydraulikdruck der Gasdruck bestimmt sowie die Temperatur gemessen wird und daß aus den Größen Druck, Temperatur und Volumen die innerhalb des Zylinders befindliche Gasmenge bestimmt und zu einer Referenzgasmenge in Beziehung gesetzt wird.The invention also includes a method for detecting the amount of gas stored within a cylinder by means of the measuring system according to the invention, in which the position of the piston is first detected by means of the above-mentioned method and the gas volume is determined from the position of the piston and from the hydraulic pressure acting on the piston Gas pressure is determined and the temperature is measured, and that the quantity of gas inside the cylinder is determined from the quantities of pressure, temperature and volume and is related to a reference gas quantity.
Im folgenden wird die Erfindung anhand eines Ausfuhrungsbei¬ spiels in einer Zeichnung gezeigt und anschließend beschrie¬ ben.In the following, the invention is shown on the basis of an exemplary embodiment in a drawing and then described.
Dabei zeigt Figur 1 schematisch das erfindungsgemäße System mit einer ersten Vorrichtung zur Erfassung der Position des Sensors, Figur 2 das erfindungsgemäße Meßsystem mit einer zweiten Vor¬ richtung zur Erfassung der Position des Sensors, Figur 3 eine weitere Ausgestaltung der Vorrichtung zur Erfas¬ sung der Position des Sensors.1 schematically shows the system according to the invention with a first device for detecting the position of the sensor, 2 shows the measuring system according to the invention with a second device for detecting the position of the sensor, FIG. 3 shows a further embodiment of the device for detecting the position of the sensor.
In der Figur 1 ist ein Hydraulikzylinder 1 für den Antrieb eines nicht dargestellten Hochspannungs-Leistungsschalters dargestellt. Ein erster Bereich 2 des Zylinders 1 ist mit ei¬ nem Hydrauliköl gefüllt. Der Zylinder 1 weist zwei Anschlüsse 3, 4 auf, wobei an den einen Anschluß 3 eine Hydraulikpumpe 5 angeschlossen ist, die das Hydrauliköl mit einem bestimmten, einstellbaren Druck von mehreren Bar beaufschlagt. Mit an¬ steigendem Druck wandert der Kolben 6 innerhalb des Zylinders 1, um dem Hydrauliköl Platz zu machen und verringert dabei das Gasvolumen 7, das beispielsweise mit Stickstoff gefüllt ist. Dabei entspricht der Gasdruck in dem Gasvolumen 7 im we¬ sentlichen dem anstehenden Hydraulikdruck, da der Kolben 6 frei beweglich ist. Der Kolben 6 ist mittels Dichtungen 8, 9 an der Innenwand des Zylinders 1 abgedichtet.1 shows a hydraulic cylinder 1 for driving a high-voltage circuit breaker, not shown. A first area 2 of the cylinder 1 is filled with a hydraulic oil. The cylinder 1 has two connections 3, 4, a hydraulic pump 5 being connected to the one connection 3, which acts on the hydraulic oil with a certain, adjustable pressure of several bars. With increasing pressure, the piston 6 moves within the cylinder 1 to make room for the hydraulic oil and thereby reduces the gas volume 7, which is filled with nitrogen, for example. The gas pressure in the gas volume 7 essentially corresponds to the hydraulic pressure present, since the piston 6 is freely movable. The piston 6 is sealed by means of seals 8, 9 on the inner wall of the cylinder 1.
Der Zylinder 1 weist einen weiteren Anschluß 4 auf, an den ein mittels des Hydrauliköls betätigbarer Antriebszylinder angeschlossen ist, der nicht dargestellt ist. Zur Betätigung des Antriebszylinders wird schlagartig über ein Ventil Hy- drauliköl aus dem Zylinder 1 abgelassen. Als Energiespeicher dient dabei das sich ausdehnende kompressible Gaε in dem Gas- volumen 7. Das Hydrauliköl ist wegen seiner weitgehenden In- kompressibilität für εich kaum in der Lage, Energie in nen¬ nenswertem Maß zu speichern.The cylinder 1 has a further connection 4, to which a drive cylinder which is actuable by means of the hydraulic oil and which is not shown is connected. Hydraulic oil is drained from cylinder 1 suddenly via a valve to actuate the drive cylinder. The expanding compressible gas in the gas volume 7 serves as an energy store. Because of its extensive incompressibility, the hydraulic oil is hardly able for me to store energy to any appreciable extent.
Ein Druckwächter 10 überwacht den Hydraulikdruck und steuert zum Nachpumpen von Hydrauliköl die Pumpe 5 an.A pressure switch 10 monitors the hydraulic pressure and controls the pump 5 to replenish hydraulic oil.
Es muß verhindert werden, daß Gas aus dem Gasvolumen 7 ent- weicht, da mit abnehmender Gasmenge die Fähigkeit zur Ener- giespeicherung abnimmt. Dies ist insbesondere deshalb wichtig, da Hochspannungs-Lei- stungεschalter sehr wartungsfreundlich εind und oft über Jahre nicht gewartet zu werden brauchen.It must be prevented that gas escapes from the gas volume 7, since the ability to store energy decreases as the amount of gas decreases. This is particularly important because high-voltage circuit breakers are very easy to maintain and often do not require maintenance for years.
Eε ist daher notwendig, die in dem Gasvolumen 7 verbliebene Gasmenge zu bestimmen.It is therefore necessary to determine the amount of gas remaining in the gas volume 7.
Die Anzahl der Gasmoleküle, die sich im Gasvolumen 7 befin¬ den, läßt sich aus dem Volumen, dem herrschenden Druck und der Temperatur bei Kenntnis der Gaskonstante unter Berück¬ sichtigung der Gasgleichung bestimmen.Da der Druck im wesent¬ lichen unter Zuhilfenahme eines Druckwächters 10 bestimmbar und auch die Temperatur meßbar ist, bleibt lediglich die Po¬ sition des Kolbens 6 und damit das Gasvolumen zu bestimmen, um danach aus den gegebenen Größen die Gasmenge in dem Gas¬ volumen 7 berechnen zu können.The number of gas molecules in the gas volume 7 can be determined from the volume, the prevailing pressure and the temperature with knowledge of the gas constant, taking into account the gas equation. Since the pressure is essentially with the aid of a pressure switch 10 Determinable and also the temperature measurable, all that remains is to determine the position of the piston 6 and thus the gas volume in order to then be able to calculate the amount of gas in the gas volume 7 from the given quantities.
Zu diesem Zweck ist an dem Kolben 6 als Positionsgeber ein Magnet 11 befestigt, desεen Magnetfeld wenigεtens teilweise durch die Wand des Zylinders 1 hindurchgreift und von einem Sensor 12 registriert wird. Der Sensor 12 ist auf einer Spindel 13 durch Drehung der Spindel 13 mittels eines MotorsFor this purpose, a magnet 11 is attached to the piston 6 as a position transmitter, the magnetic field of which at least partially reaches through the wall of the cylinder 1 and is registered by a sensor 12. The sensor 12 is on a spindle 13 by rotating the spindle 13 by means of a motor
14 verschiebbar. Dabei ist der Sensor 12 in einer Halterung14 slidable. The sensor 12 is in a holder
15 befestigt, die durch eine Stange 16 bei Betätigung der Spindel 13 gegen Mitdrehen gesichert ist.15 attached, which is secured against rotation by a rod 16 when the spindle 13 is actuated.
Der Sensor 12 kann beispielsweiεe ein Hall-Senεor εein.The sensor 12 can, for example, be a Hall sensor.
Durch Betätigung deε Motorε 14 kann der Senεor 12 an dem Zy- linder 1 entlang bewegt werden. Dabei kann laufend die Inten¬ sität des Magnetfeldes gemesεen und somit eine Intensitäts¬ verteilung erfaßt werden. Die höchste magnetische Feldstärke wird an der Position des Magneten 11 gemessen.By actuating the motor 14, the sensor 12 can be moved along the cylinder 1. The intensity of the magnetic field can be measured continuously and thus an intensity distribution can be detected. The highest magnetic field strength is measured at the position of the magnet 11.
Es ist nun eine Regeleinrichtung 17 vorgesehen, die Befehle über eine Leitung 18 an den Motor 14 abgibt und gleichzeitig die jeweils nachgewiesene Magnetfeldintensität von dem Sensor 12 regiεtriert. Der Motor wird εolange betätigt, bis daß eine maximale Magnetfeldintensität von dem Sensor 12 registriert wird. In dieser Situation wird davon ausgegangen, daß der Sensor 12 dem als Positionsgeber dienenden Magneten 11 genau gegenübersteht .A control device 17 is now provided, which issues commands via a line 18 to the motor 14 and at the same time the respectively detected magnetic field intensity from the sensor 12 registered. The motor is actuated until a maximum magnetic field intensity is registered by the sensor 12. In this situation it is assumed that the sensor 12 is exactly opposite the magnet 11 serving as a position transmitter.
Durch ein an dem Motor 14 angebrachtes Zählwerk 19 wird die durch den Motor 14 übertragene Bewegung registriert und es kann somit an dem Zählwerk 19 direkt die Position des Sensorε 12 abgeleεen werden. Hierdurch iεt direkt die Poεition deεThe movement transmitted by the motor 14 is registered by a counter 19 attached to the motor 14 and the position of the sensor 12 can thus be read directly on the counter 19. As a result, the position is directly
Magneten 11 bzw. deε Kolbens 6 bestimmbar. Mittels eines Tem- peratursenεors 20 ist außerdem die Gaεtemperatur in dem Gas¬ volumen 7 bestimmbar. Es εtehen εomit die Größen Volumen, Temperatur deε Gases und Gasdruck εowie die Art deε Gases zur weiteren Bestimmung der Gasmenge zur Verfügung. Es kann zu diesem Zweck eine automatische Vorrichtung vorgesehen sein, die mit einem Druckwächter 10, dem Temperatursensor 20 und dem Zählwerk 19 des Motors verbunden ist und automatisch de¬ ren Meßwerte einlieεt εowie unter Berückεichtigung der gege- benen, von der Gasart abhängigen Konstanten die Gasmenge be¬ stimmt und bei Unterschreiten einer vorgegebenen unteren Grenze der Gasmenge eine Warnung ausgibt oder den Hochspan- nungs-Leistungsschalter blockiert oder ausschaltet.Magnet 11 or deε piston 6 can be determined. The gas temperature in the gas volume 7 can also be determined by means of a temperature sensor 20. The variables volume, temperature of the gas and gas pressure and the type of gas are thus available for further determination of the gas quantity. For this purpose, an automatic device can be provided, which is connected to a pressure switch 10, the temperature sensor 20 and the counter 19 of the engine and automatically inputs its measured values, and taking into account the given gas type-dependent constants determined and, if the gas quantity falls below a predetermined lower limit, issues a warning or blocks or switches off the high-voltage circuit breaker.
In den Figuren 2 und 3 sind Elemente, die in gleicher Form bereits in der Figur 1 dargestellt sind, mit gleichen Bezugs¬ zeichen versehen.In FIGS. 2 and 3, elements that are already shown in the same form in FIG. 1 are provided with the same reference symbols.
Bei der Ausführungεform gemäß der Figur 2 wird die Poεition des Sensors 2 ebenso geregelt wie bei der Ausführungsform ge¬ mäß Figur 1.In the embodiment according to FIG. 2, the position of sensor 2 is regulated in the same way as in the embodiment according to FIG. 1.
In diesem Fall wird die Position deε Sensors 12 nicht über ein Zählwerk an dem Motor 14 registriert, sondern mittels ei- ner handelsüblichen Ultraschallentfernungεmeßeinrichtung 21, die an dem Zylinder 1 ortεfeεt angeordnet ist und die Entfer- nung zu dem Sensor 12 bzw. zu der Halterung 15 bestimmt und zur weiteren Bestimmung der Gasmenge zur Verfügung stellt.In this case, the position of the sensor 12 is not registered on the motor 14 via a counter, but rather by means of a commercially available ultrasonic distance measuring device 21 which is arranged on the cylinder 1 and which detects the distance. determined to the sensor 12 or to the bracket 15 and provides for further determination of the amount of gas.
Bei der Ausführungsform gemäß der Figur 3 wird die Position des Sensors 12 nicht durch Messung an dem Sensor selbst, son¬ dern durch Registrierung der an den Motor 14 gerichteten Be¬ fehle vorgenommen. Zu diesem Zweck ist eine Auswerteeinrich¬ tung 22 zur Erfasεung und Auswertung der von dem Regelsystem 17 an den Antrieb abgegebenen Stellsignale vorgesehen, in der aus den Stellsignalen die jeweilige Position des Sensors 12 bestimmt und für eine weitere Bestimmung der Gasmenge in dem Gasvolumen 7 zur Verfügung gestellt wird.In the embodiment according to FIG. 3, the position of the sensor 12 is not carried out by measuring the sensor itself, but rather by registering the commands directed to the motor 14. For this purpose, an evaluation device 22 is provided for detecting and evaluating the control signals output by the control system 17 to the drive, in which the respective position of the sensor 12 is determined from the control signals and is available for a further determination of the gas quantity in the gas volume 7 is provided.
Es kann sich bei dem Motor 14 beispielsweise um einen Schrittmotor handeln, der durch einzelne Stellimpulse jeweils um einen definierten Winkel weitergedreht wird. Mit einem solchen Schrittmotor ist eine beεonders genaue Steuerung des Sensors 12 und eine zuverläsεige Regiεtrierung der Bewegung und entsprechende Erfassung der Stellung des Sensorε 12 mög- lieh. The motor 14 can be a stepper motor, for example, which is rotated further by a defined angle by means of individual actuating pulses. With such a stepper motor, a particularly precise control of the sensor 12 and a reliable registration of the movement and corresponding detection of the position of the sensor 12 are possible.

Claims

Patentansprüche claims
1. Meßsystem zur Erfassung der Position eines in einem druck- beaufschlagbaren Zylinder (1) bewegbaren Kolbens (6), g e k e n n z e i c h n e t d u r c h einen mit dem Kol¬ ben (6) verbundenen Positionsgeber (11), einen entlang der Bewegungsbahn des Positionsgebers (11) außerhalb des Zylin¬ ders (1) mittels eines Antriebs (13, 14) antreibbaren Sensors (12) , der in Abhängigkeit von seiner Entfernung zu dem Positionsgeber (11) eine Signalstärke erfaßt, eine mit dem Sensor verbundene Regeleinrichtung (17), die Befehle an den Antrieb (13, 14)abgibt und hierdurch die Position des Sensorε (12) einstellt, an dem dieser eine maximale Signalstärke er¬ faßt, und eine Vorrichtung (19; 21; 22) zur Erfasεung der Position des Sensors.1. Measuring system for detecting the position of a piston (6) movable in a pressurizable cylinder (1), characterized by a position transmitter (11) connected to the piston (6), one along the movement path of the position transmitter (11) outside the Zylin¬ ders (1) by means of a drive (13, 14) drivable sensor (12), which detects a signal strength depending on its distance from the position transmitter (11), a control device (17) connected to the sensor, the commands to the Outputs drive (13, 14) and thereby adjusts the position of the sensor (12), at which it detects a maximum signal strength, and a device (19; 21; 22) for detecting the position of the sensor.
2. Meßsystem nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Vorrichtung (22) zur Erfasεung der Position des Sensors (12) eine Auswerte-Einrichtung zur Erfasεung und Auεwertung der von dem Regelεystem (17) an den Antrieb (13, 14) abgege¬ benen Stellεignale und zur Beεtimmung der Position des Kol¬ bens (6) aus desεen Auεgangεεtellung und den Stellsignalen aufweist .2. Measuring system according to claim 1, characterized in that the device (22) for detecting the position of the sensor (12) is an evaluation device for detecting and evaluating the from the control system (17) to the drive (13, 14) Has actuating signals and for determining the position of the piston (6) from its initial position and the actuating signals.
3. Meßεyεtem nach Anεpruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Vorrichtung (19; 21) zur Erfaεεung der Position des Sen¬ sors (12) eine Einrichtung zur Erfassung der Aktivität des Antriebs (13, 14) und eine Einrichtung zur Bestimmung der Po¬ sition des Kolbens (6) aus deεsen Auεgangεεtellung und der erfolgten Aktivität deε Antriebs (13, 14) aufweist.3. Measuring system according to claim 1, characterized in that the device (19; 21) for detecting the position of the sensor (12) has a device for detecting the activity of the drive (13, 14) and a device for determining the position of the piston (6) from its initial position and the activity of the drive (13, 14).
4. Meßεystem nach Anspruch 1 oder einem der folgenden, d a d u r c h g e k e n n z e i c h n e t , daß der Poεitionεgeber (11) einen Magneten aufweiεt und daß der Sensor (12) zum Nachweis von magnetischen Feldern geeignet iεt.4. Messεystem according to claim 1 or one of the following, characterized in that the position sensor (11) has a magnet and that the sensor (12) is suitable for detecting magnetic fields.
5. Meßsystem nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , daß der Sensor (12) ein Ultraschallεensor ist und das zusätzlich ein Ultraschallεender zur Einstrahlung von Ultraεchallsigna- len in den Zylinder (1) vorgesehen ist.5. Measuring system according to one of claims 1 to 3, so that the sensor (12) is an ultrasound sensor and that an ultrasound transmitter is also provided for irradiating ultrasound signals into the cylinder (1).
6. Verfahren zur Erfassung der Position eineε in einem druck- beaufschlagbaren Zylinder bewegbaren Kolbens (6), d a d u r c h g e k e n n z e i c h n e t , daß mit dem Kolben (6) ein Positionsgeber (11) verbunden ist und daß mittels einer Regeleinrichtung (17) ein Sensor (12) ent¬ lang der Bewegungsbahn deε Poεitionεgeberε (11) außerhalb deε Zylinders (1) mittels eines Antriebs (13, 14) derart an¬ getrieben wird, daß eine Position des Sensors (12) einge¬ stellt wird, an der dieser eine maximale Signalstärke mißt und daß danach die Position des Sensorε (12) erfaßt und hierauε die Poεition deε Kolbenε (6) beεtimmt wird.6. A method for detecting the position of a piston (6) movable in a pressurizable cylinder, characterized in that a position sensor (11) is connected to the piston (6) and that a sensor (12) is ent by means of a control device (17) ¬ along the path of movement of the position transmitter (11) outside the cylinder (1) by means of a drive (13, 14) is driven such that a position of the sensor (12) is set at which it measures a maximum signal strength and that the position of the sensor (12) is then detected and the position of the piston (6) is determined therefrom.
7. Verfahren zur Erfaεεung der innerhalb eineε Zylinderε (1) geεpeicherten Gaεmenge mittelε eineε Meßsystems gemäß Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß zunächεt mittelε deε Verfahrens gemäß Anspruch 6 die Position des Kolbens (6) erfaßt wird, daß aus der Position des Kolbens (6) das Gaεvolumen beεtimmt wird, daß aus dem auf den Kolben (6) wirkenden Hydraulikdruck der Gasdruck bestimmt wird, daß die Temperatur gemesεen wird und daß aus den Größen Druck, Temperatur und Volumen die innerhalb des Zylinderε (1) be¬ findliche Gasmenge bestimmt und zu einer Refernzgasmenge in7. A method for detecting the gas quantity stored within a cylinder (1) by means of a measuring system according to claim 1, characterized in that first the position of the piston (6) is detected by means of the method according to claim 6, that from the position of the piston (6) the gas volume is determined, that the gas pressure is determined from the hydraulic pressure acting on the piston (6), that the temperature is measured, and that the gas quantity inside the cylinder (1) is determined and increased from the pressure, temperature and volume a reference gas quantity in
Beziehung geεetzt wird. Relationship is set.
PCT/DE1996/001973 1995-10-12 1996-10-11 Measurement system for sensing the position of a piston WO1997014012A2 (en)

Priority Applications (2)

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EP96945358A EP0855014A2 (en) 1995-10-12 1996-10-11 Measurement system for sensing the position of a piston

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DE19539551.4 1995-10-12
DE1995139551 DE19539551C2 (en) 1995-10-12 1995-10-12 Measuring system and method for detecting the position of a piston

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EP2647849A3 (en) * 2012-04-02 2017-08-16 MARCO SYSTEMANALYSE UND ENTWICKLUNG GmbH Position determining device
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WO1997014012A3 (en) 1997-05-15
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JP2000502178A (en) 2000-02-22
EP0855014A2 (en) 1998-07-29

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