EP2401514B1 - Soupape a regulation proportionnelle pour utilisations pneumatiques - Google Patents

Soupape a regulation proportionnelle pour utilisations pneumatiques Download PDF

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Publication number
EP2401514B1
EP2401514B1 EP10708109A EP10708109A EP2401514B1 EP 2401514 B1 EP2401514 B1 EP 2401514B1 EP 10708109 A EP10708109 A EP 10708109A EP 10708109 A EP10708109 A EP 10708109A EP 2401514 B1 EP2401514 B1 EP 2401514B1
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EP
European Patent Office
Prior art keywords
control valve
proportional control
signal
setpoint
valve
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Active
Application number
EP10708109A
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German (de)
English (en)
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EP2401514A1 (fr
Inventor
Max Schrobenhauser
Jochen Schaible
Günther RAUSCH
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Hoerbiger Automatisierungstechnik Holding GmbH
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Hoerbiger Automatisierungstechnik Holding GmbH
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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors

Definitions

  • the present invention relates to a proportional control valve for pneumatic applications comprising a piezoelectrically controllable valve element, a sensor for measuring an actual value of a controlled variable, an electrical interface for receiving a nominal value for the controlled variable representative setpoint signal and a control electronics. Furthermore, the present invention also relates to an assembly of a signal generator and a connected to the signal generator valve of the aforementioned type and a method for operating such a module.
  • Proportional control valves of the type mentioned, which are suitable for a variety of pneumatic applications, are known from the prior art, in the context of the present invention is particularly intended to such proportional control valves, in which the aforementioned components (ie the piezoelectrically controllable valve element, the control electronics, the electrical interface and the sensor) as a structural unit (eg within a housing) are realized.
  • Such valves are used for example in a pneumatic system of machines, such as printing or paper machines, where they - often in confined spaces - must be installed at certain points in the compressed air lines leading the pneumatic system of the machine.
  • Proportional control valves of the aforementioned type require for their operation a current or voltage supply, with which in particular the electrical power (or the electrical energy) for the operation of the control electronics and for adjusting the piezoelectrically actuable valve element is provided. Also, the actual value of the control variable determining and providing in the form of an electronic signal sensor requires as part of such a proportional control valve usually a supply of electrical energy.
  • an electrically pneumatic system with a piezoelectrically switchable 3/2 directional control valve is known in which the signal emitted by a controller for controlling a driver stage of the valve is generated and transmitted in the form of a digital pulse width modulated (PWM) signal.
  • PWM digital pulse width modulated
  • the in the DE 195 34 017 C2 With regard to the signal transmission by means of said PWM signal, the type of digital communication described relates exclusively to the communication path between the control electronics provided there and the electrical input of the 3/2-way valve functioning as a valve element and thus gives no indication, as in the case of a generic proportional control valve with integrated control electronics to a separate power or power supply, which supplies the entire proportional control valve (including control electronics) with electrical energy, can be omitted.
  • the shows DE 3717260 A1 a designed as a solenoid valve proportional valve, wherein the control and power supply of the power stage of the solenoid valve via a pulse width modulated control signal. It is not a control valve, in which with the aid of a control electronics from the actual value obtained by a sensor and represented by a desired signal Setpoint a control signal must be calculated. Rather, the control signal is supplied there by an external microprocessor, which obviously has a separate power / voltage supply. A continuous comparison between the actual value and the desired value in the sense of a closed control loop is, in the case of the magnetic valve or the circuit arrangement described for this purpose, different from generic proportional control valves according to US Pat DE 3717260 A1 not provided.
  • the object of the present invention to provide a cost-effective as possible and easy to install in pneumatic systems Proportionalregelventil in which can be dispensed with a separate power or power supply to operate the proportional control valve. Furthermore, the present invention is based on the provision of an assembly of a signal generator and a proportional control valve, which satisfies the above task, as well as a method for operating the module.
  • the electrical interface is a 2-wire interface for receiving a pulse width modulated digital command signal, wherein the proportional control valve is adapted to the entire electrical energy (or power) to operate of the proportional control valve from the digital target signal to win.
  • the entire electrical energy (or power) for operation of the proportional control valve can be obtained from the desired signal, it follows immediately that - in addition to the electrical 2-wire interface for receiving a digital and pulse width modulated setpoint signal - no further electrical interface to Power or voltage supply of the entire proportional control valve (including its components) is necessary or intended.
  • the electrical energy for operation of the control electronics, the operation of the sensor and the adjustment (or operation) of the piezoelectrically actuated valve element is completely recovered from the incoming to the electrical 2-wire interface digital command signal.
  • a proportional control valve for connection to digital signal transmitter with 2-wire interface, for example in the form of a commercially available 2-wire bus system provided.
  • the proportional control valve according to the invention need only be connected to the digital signal transmitter via commercially available 2-conductor connection cables, without the need for a separate line or a separate connection for an external power or voltage supply.
  • Corresponding cable break monitoring units are known from the prior art, for example as part of digital signal transmitters.
  • a piezoelectrically actuable valve element is used, which is characterized by a particularly low energy consumption.
  • This is preferably a valve element with a so-called pneumatic booster, that is to say a valve element with a piezopneumatic precursor and a pneumatic power stage connected downstream of it, as is the case for example in the case of the German patent application DE 10 2008 057 415.5 known proportional pressure control valve is the case.
  • the communication between the control electronics providing the actuating signal for the valve element and the piezoelectric actuator of the proportional control valve can take place in an analogue or digital manner.
  • the electronic control uses the algorithms known from the state of the art in order to calculate an appropriate control signal for the piezoelectric actuator of the (piezoelectrically controllable) valve element from the actual value and setpoint value.
  • the sensor comes - depending on the controlled variable provided in the specific pneumatic application - different types of sensor in question (eg pressure or flow sensors), which, in view of the only limited available from the PWM signal electrical energy as possible resorted to a - in energy terms - particularly economical sensor.
  • sensors are - also in a cost-effective design - known from the prior art.
  • a proportional control valve which is characterized by great flexibility in a variety of installation situations.
  • the distance between the proportional control valve to an external power supply is irrelevant, since the - the control electronics preferably in unit-containing - proportional control valve just does not have to be connected to an external power or voltage source.
  • the valve according to the invention can serve as a low-cost component for a pneumatic system and there for the replacement of - for cost reasons, still popular today - are used manual regulators.
  • the proportional control valve has a decoupling circuit arranged between electrical interface and control electronics, with which from the digital reference signal on the one hand for the operation of the proportional control valve necessary electrical power and on the other one for the desired value characteristic input signal for the control electronics is coupled out.
  • the aforementioned decoupling circuit is preferably designed in structural unit with the other components of the proportional control valve according to the invention, which is preferably done by an arrangement within a housing containing the entire proportional control valve incl. Control electronics and sensor.
  • the proportional control valve is a pressure regulating valve for pneumatic applications, in which case a sensor is preferably to be selected as the sensor. Alternatively, however, it may also be a flow control valve with a flow sensor.
  • the pressure sensor is then advantageously arranged such that the output-side pressure on the valve element is determined as the actual value for the controlled variable.
  • the digital command signal received at its electrical interface by the proportional control valve according to the invention is preferably a pulse width modulated signal from DC pulses (emitted at predetermined time intervals) with an amplitude in the range of about 20 to about 30 V, common signal transmitters having a voltage amplitude of 24 volts to have. Other voltage amplitudes are However, in the context of the present invention conceivable in principle.
  • the design of the RC element is to be made in a suitable function of the repetition rate of the voltage pulses in the desired signal.
  • valve element is adjustable or adjusted from a predefined fail-safe position against a spring force.
  • a predefined fail-safe position for example a venting position.
  • a spring force can e.g. be applied by a suitably arranged spring.
  • the present invention relates not only to the proportional control valve according to the invention as such, but also an assembly of a digital signal transmitter and at least one connected via a connecting cable to the signal generator and proportional control valve according to the invention.
  • the signal generator and connection cable for generating and transmitting the digital pulse width modulated signal in 2-wire design in the form of commercially available and relatively cheap bus systems are available.
  • Such signal generators are in particular also available with a plurality of output interfaces which can be controlled independently of one another, so that preferably a connection of a plurality of proportional control valves of the type according to the invention to a signal transmitter is also made possible in an assembly according to the invention.
  • interconnect cable used in the assembly may be a non-shielded 2-conductor cable of conventional design. Expensive shielded cables, as they must be used in previously known 3-conductor systems with separate power supply or power supply, it is therefore not necessary in the context of the present invention.
  • control signal provided by the control electronics is an analog signal, whereby a particularly cost-effective way to control the piezoelectric actuator of the proportional control valve according to the invention is taken.
  • valve element of the proportional control valve in the absence of a desired signal under the action of a spring force in a pre specified fail-safe state is switched. This is, for example, a blocking or venting position of the valve element.
  • the drawing shows a schematic representation of an assembly 1 according to the invention from a digital signal transmitter 2 and a proportional control valve 3 connected thereto via a 2-conductor cable.
  • the presently designed as a pressure control valve proportional control valve 3 is formed as a unit of a piezoelectrically controllable valve element 4, an electrical 2-wire interface 5a for receiving a digital pulse width modulated command signal 6, a control electronics 7 and a pressure sensor 8.
  • the PWM signal generated by the digital signal generator 2 -if possibly by evaluating a programmable logic controller for this purpose-is made available there at a 2-conductor interface 5b and transmitted via a two-wire connection cable 5c to the corresponding 2-conductor interface 5a of the proportional control valve 3 according to the invention.
  • the valve element 4 has an input 9 and an output 10, with which it is input and output side with a pressure-carrying line of a pneumatic Systems (not shown) can be connected. It is, as the valve element 4 can be schematically seen in the drawing, executed in the manner of a 3/3-valve and thus adjustable between a passage, a blocking and a venting position, wherein the valve element 4 via a piezoelectric actuator 11 is activated or actuated.
  • the proportional control valve further comprises a decoupling circuit 12, with which decoupled from the applied to the 2-wire interface 5 target signal 6 for operating the entire proportional control valve 3 (including all its components) necessary energy and the control electronics 7 is supplied. This is done by using an RC element formed by a resistor 13a and a capacitor 13b by voltage tapping the voltage applied at point 14 of the circuit diagram on the capacitor 13b against the ground potential.
  • the resistor 13a of the RC element upstream diode 15 prevents unwanted discharge of the voltage applied to the capacitor 13b.
  • the RC element is dimensioned such that the voltage which can be tapped off by the control loop never falls below a minimum voltage necessary for the operation of the proportional valve 3 between two successive DC voltage pulses of the digital command signal 6.
  • the piezoelectrically controlled Valve element 4 requires only in the case of its adjustment of a (low) power consumption.
  • control electronics 7 This is compared by the control electronics 7 with the provided by the pressure sensor 8 in the form of an electrical signal available actual value for the voltage applied to the output 10 of the valve output pressure, whereupon a suitable control signal for the piezoelectric actuator 11 of the valve element 4 is generated.
  • valve element 4 By a suitably arranged spring 18 (shown here only schematically), the valve element 4 can be biased in a suitable fail-safe state.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Claims (13)

  1. Soupape de régulation proportionnelle (3) pour applications pneumatiques comprenant un élément de soupape (4) à commande piézoélectrique, un capteur (8) pour mesurer une valeur effective d'une grandeur de réglage, une interface électrique (5a) pour recevoir un signal de consigne (6) représentant la valeur de consigne pour la grandeur de réglage ainsi qu'une électronique de régulation (7), caractérisée en ce que l'interface électrique (5a) est une interface à 2 conducteurs pour recevoir un signal de consigna (6) numérique modulé par largeur d'impulsion, dans laquelle la soupape de régulation proportionnelle (3) est conçue afin de récupérer du signal de consigne numérique (6) l'énergie électrique totale pour mettre en fonctionnement la soupape de régulation proportionnelle (3).
  2. Soupape de régulation proportionnelle (3) selon la revendication 1, caractérisée en ce que la soupape de régulation proportionnelle (3) présente un circuit de découplage (12) disposé entre une interface électrique (5a) et une électronique de régulation (7), avec lequel d'une part l'énergie électrique nécessaire au fonctionnement de la soupape de régulation proportionnelle (3) et d'autre part un signal d'entrée pour l'électronique de régulation (7), caractéristique de la valeur de consigne sont découplés du signal de consigne numérique (6).
  3. Soupape de régulation proportionnelle (3) selon la revendication 1, caractérisée en ce que la soupape de régulation proportionnelle (3) est une soupape de régulation de pression et le capteur (8) est un capteur de pression.
  4. Soupape de régulation proportionnelle (3) selon la revendication 3, caractérisée en ce que la grandeur de réglage est la pression de sortie sur l'élément de soupape (4).
  5. Soupape de régulation proportionnelle (3) selon la revendication 1, caractérisée en ce que le signal de consigne (6) numérique modulé par largeur d'impulsion est un signal composé d'impulsions de tension continue avec une amplitude dans la plage d'environ 20 à environ 30 V.
  6. Soupape de régulation proportionnelle (3) selon la revendication 5, caractérisée en ce que le signal de consigne (6) numérique modulé par largeur d'impulsion est modulé avec des taux de répétition dans la plage de 1Hz à 10KHz.
  7. Soupape de régulation proportionnelle (3) selon la revendication 5, caractérisée en ce que le circuit de découplage pour découpler la puissance électrique pour la soupape de régulation proportionnelle comprend un organe RC (13a, 13b), qui est dimensionné dans sa constante temporelle (τ) de telle sorte que la tension découplée entre deux signaux de tension continue du signal de consigne ne baisse jamais en dessous d'une tension minimale nécessaire au fonctionnement de la soupape de régulation proportionnelle (3).
  8. Soupape de régulation proportionnelle (3) selon la revendication 1, caractérisée en ce que l'élément de soupape (4) est réglable à partir d'une position à sûreté intégrée prédéfinie en sens contraire à une force de ressort.
  9. Module (1) composé d'un générateur de signaux numériques (2) et d'au moins une soupape de régulation proportionnelle (3) selon une des revendications précédentes reliée par l'intermédiaire d'un câble de liaison (5c) au générateur de signaux (2).
  10. Module selon la revendication 9, dans lequel le câble de liaison (5c) est un câble à 2 conducteurs non blindé.
  11. Procédé de fonctionnement d'un module (2) selon une des revendications 9 à 10 comprenant les étapes suivantes consistant à :
    a) émettre en continu par le générateur de signaux (2), un signal de consigne numérique, modulé par largeur d'impulsion, moyennant quoi le signal de consigne représente la valeur de consigne pour la grandeur de réglage,
    b) recevoir le signal de consigne sur l'interface électrique (5a) de la soupape de régulation proportionnelle (3),
    c) découpler du signal de consigne une alimentation en courant ou en tension pour la soupape de régulation proportionnelle (3) et un signal d'entrée pour l'électronique de régulation (7),
    d) comparer par l'électronique de régulation (7) la valeur effective pour la grandeur de réglage représentée par un signal de capteur avec la valeur de consigne pour la grandeur de réglage représentée par le signal d'entrée sur l'électronique de régulation (7) et
    e) émettre par l'électronique de régulation (7) un signal de réglage approprié pour un actionneur piézoélectrique (11) de l'élément de soupape (4) quand la valeur effective et la valeur de consigne ne concordent pas, moyennant quoi
    f) la puissance électrique pour faire fonctionner l'électronique de régulation (7) et le capteur (8) ainsi que pour régler l'élément de soupape (4) est complètement découplée du signal de consigne.
  12. Procédé selon la revendication 11, caractérisé en ce que le signal de réglage est un signal analogique.
  13. Procédé selon la revendication 11, caractérisé en ce que l'élément de soupape (4) de la soupape de régulation proportionnelle (3) est commuté sous l'action d'une force de ressort en un état de sureté intégrée prescrit au préalable quand subsiste un signal de consigne.
EP10708109A 2009-02-25 2010-02-25 Soupape a regulation proportionnelle pour utilisations pneumatiques Active EP2401514B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009010339A DE102009010339A1 (de) 2009-02-25 2009-02-25 Proportionalregelventil für pneumatische Anwendungen
PCT/EP2010/001154 WO2010097215A1 (fr) 2009-02-25 2010-02-25 Soupape à régulation proportionnelle pour utilisations pneumatiques

Publications (2)

Publication Number Publication Date
EP2401514A1 EP2401514A1 (fr) 2012-01-04
EP2401514B1 true EP2401514B1 (fr) 2013-01-09

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EP10708109A Active EP2401514B1 (fr) 2009-02-25 2010-02-25 Soupape a regulation proportionnelle pour utilisations pneumatiques

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EP (1) EP2401514B1 (fr)
DE (1) DE102009010339A1 (fr)
WO (1) WO2010097215A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011018873A1 (de) 2011-04-28 2012-10-31 Hydac Electronic Gmbh Pneumatisches Ventil und seine Verwendung für einen angeschlossenen Verbraucher
DE102011109983B3 (de) * 2011-08-11 2013-01-17 Festo Ag & Co. Kg Fluidelektrisches Netzgerät

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1945883A (en) * 1982-09-27 1984-04-24 Foxboro Company, The Valve converter/positioner with remote feedback and memory
DE3717260A1 (de) * 1987-05-22 1988-12-01 Rexroth Mannesmann Gmbh Schaltungsanordnung zum uebertragen einer versorgungsspannung und eines steuersignals
DE4333358B4 (de) * 1993-09-30 2004-07-15 Robert Bosch Gmbh Schaltungsanordnung zur Informationsübertragung auf einer Zweidrahtleitung
DE19534017C2 (de) 1995-09-14 1997-10-09 Samson Ag Elektrisch-pneumatisches System
DE19632691A1 (de) * 1996-07-23 1998-01-29 Joucomatic Gmbh Wandlervorrichtung
DE102006039985A1 (de) * 2006-08-25 2008-02-28 Robert Bosch Gmbh Kommunikationsvorrichtung und Datenübertragungsverfahren
DE102008057415B3 (de) 2008-11-14 2010-06-17 Hoerbiger Automatisierungstechnik Holding Gmbh Maschine zur Bearbeitung eines Werkstücks mittels eines Laserstrahls

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Publication number Publication date
WO2010097215A1 (fr) 2010-09-02
DE102009010339A1 (de) 2010-08-26
EP2401514A1 (fr) 2012-01-04

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