EP0164602B2 - Device for regulating the pressure and the capacity of a variable-capacity pump - Google Patents

Device for regulating the pressure and the capacity of a variable-capacity pump Download PDF

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Publication number
EP0164602B2
EP0164602B2 EP85105969A EP85105969A EP0164602B2 EP 0164602 B2 EP0164602 B2 EP 0164602B2 EP 85105969 A EP85105969 A EP 85105969A EP 85105969 A EP85105969 A EP 85105969A EP 0164602 B2 EP0164602 B2 EP 0164602B2
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EP
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Prior art keywords
capacity
pressure
pump
regulating
control valve
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EP85105969A
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German (de)
French (fr)
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EP0164602A2 (en
EP0164602A3 (en
EP0164602B1 (en
Inventor
Volker Dipl.-Ing. Palm
Berthold Pfuhl
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to AT85105969T priority Critical patent/ATE46561T1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity

Definitions

  • the invention is based on a device of the type (DE 31 19 095 C2) of claim 1.
  • an adapted controller is usually required for the regulation of the pressure and the delivery rate in connection with corresponding actual value sensors for each production phase.
  • the controllers used are each switched over or work as a limiter circuit with an automatic transition from speed to pressure control. If such a device or pump is used to control injection molding machines, the problem with a last-mentioned regulator arises that the pressure regulator runs within the control limits during the speed phase of the pressure cylinder and therefore an optimal transition from speed to pressure control is not possible.
  • an electrical control system which comprises a sensor coupled to the actuator of the pump, as well as a setpoint current generator for generating a setpoint current signal indicating the setpoint for the delivery flow of the pump , furthermore a device for combining the desired current signal and the position signal to form a resulting signal which indicates a desired position for the actuator, and a signal converter for converting the resulting signal into a pressure medium pressure signal which is proportional thereto and which is applied to the actuator.
  • the drawing shows a control device for an adjustable pump in a schematic representation.
  • 10 denotes an adjustable pump, which sucks in pressure medium from a container 12 via a suction line 11 and displaces it into a delivery line 13.
  • the delivery line 13 leads to a working cylinder 14; in it a directional valve 15 (control valve) with three switching positions with a continuous transition is arranged, for. B. an electromagnetically actuated proportional valve.
  • the actuator 16 determining the delivery rate of the pump 10 z. B. the swash plate of an axial piston pump - is set with the help of two opposing actuating pistons 17, 18 with areas of unequal size.
  • the actuating piston 18 is acted upon via a line 19 which starts from the delivery line 13, specifically from a point downstream of the directional control valve 15 lies.
  • the actuating piston 17 is acted upon by a control line 20, which is also connected to the delivery line 13, specifically at a point which lies between the pump 10 and the directional control valve 15.
  • the directional control valve 15 is set by an electromagnet 23, which is connected via an electrical line 24 to an electronic control unit 25, from which a first electrical line 26 leads to an electronic flow limiter 27 and a second electrical line 28 to a position transducer 29 of the directional control valve 15
  • the position sensor 29 continuously signals the position of the directional valve 15 to the electronic control unit 25; this in turn specifies, by means of a signal received from line 26, correspondingly processed values via line 24 to electromagnet 23, which adjusts directional valve 15 accordingly.
  • An electrical pressure transmitter 31 is connected to the delivery line 13 and leads an actual value reserve 33 via an electrical line 32 and the differentiated actual pressure value to a control amplifier 35 via a line 42.
  • An electrical line 34 branches off from the electrical line 32 and also leads to the control amplifier 35, to which the pressure setpoint P to be generated by the pump is input via an input 36.
  • the quantity limiter 27 has a 3 input 37, via which the delivery volume to be provided by the pump is input; it also limits their maximum Output. Furthermore, a tracking 39 is provided in the control device, which brings the control amplifier 35 into operative connection with the quantity limiter 27.
  • the individual units 33, 35, 27 and 39 contain various amplifiers, resistors and capacitors, the mode of operation of which has not been discussed in detail, since this does not contribute to a better understanding of the invention. Only one diode 40 in the actual value reserve 33 is mentioned Function is discussed below.
  • the working cylinder 14 is designed to be single-acting and in the exemplary embodiment represents the pressure cylinder of an injection molding machine.
  • the speed and pressure curve on the working cylinder 14 is important.
  • the speed curve refers to the feed movement of the piston.
  • the function of the directional control valve 15 is to adjust the delivery quantity or the delivery pressure of the pump in accordance with the above-mentioned setpoint specifications. As long as the quantity limiter 27 is not effective, the setpoint quantity M prevails unchanged.
  • the electronic control unit is controlled with this value and the directional control valve is positioned according to the setpoint.
  • control piston 18 is connected via the control line 19 to the delivery line 13 in front of the directional control valve, the force on this - because its area is larger - prevails so that the force on the piston 17 is overcome and the pump 10 is set to a larger delivery rate. A constant pressure difference and thus a quantity adjustment of the pump proportional to the setpoint is achieved via this control piston.
  • the pressure setpoint and actual value are compared at the control amplifier 35, and after appropriate amplification, this signal acts on the quantity limiter 27 and corrects the setpoint of the delivery quantity until the actual value determined on the pressure transmitter 31 corresponds to the pressure setpoint entered at the input 36

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Transmission Device (AREA)

Abstract

A pressure and delivery regulating device for an adjustable pump includes a directional control valve connected in a discharge conduit and to a control conduit branching from the discharge conduit between the pump and the directional control valve. The control conduit leads to a setting piston for the adjustment of the pump. The directional control valve is controlled by a solenoid which in turn is controlled by a control system consisting of a regulating circuit, a delivery limiting circuit and a control circuit for the solenoid. The output signal from the regulating circuit controls a desired delivery value signal supplied to the delivery limiting circuit. A follow-up circuit connected between the regulating circuit and the delivery limiting circuit corrects the regulating signal and a circuit for producing a direction dependent signal from the actual pressure provides a damping of the regulating circuit.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Einrichtung nach der Gattung (DE 31 19 095 C2) des Anspruchs 1. Bei derartigen bekannten Einrichtungen ist üblicherweise für die Regelung des Druckes und der Fördermenge in Verbindung mit entsprechenden Istwertaufnehmern für jede Proteßphase ein angepaßter Regler erforderlich. Die verwendeten Regler werden jeweils umgeschaltet oder arbeiten als Begrenzerschaltung mit automatischem Übergang von Geschwindigkeits- in Druckregelung. Wird eine derartige Einrichtung bzw. Pumpe zur Steuerung von Spritzgießmaschinen verwendet, so tritt bei einem zuletzt genannten Regler das Problem auf, daß während der Geschwindigkeitsphase des Druckzylinders der Druckregler in die Stellgrenzen läuft und somit ein optimaler Übergang von Geschwindigkeits- in Druckregelung nicht möglich ist.The invention is based on a device of the type (DE 31 19 095 C2) of claim 1. In such known devices, an adapted controller is usually required for the regulation of the pressure and the delivery rate in connection with corresponding actual value sensors for each production phase. The controllers used are each switched over or work as a limiter circuit with an automatic transition from speed to pressure control. If such a device or pump is used to control injection molding machines, the problem with a last-mentioned regulator arises that the pressure regulator runs within the control limits during the speed phase of the pressure cylinder and therefore an optimal transition from speed to pressure control is not possible.

Weiterhin ist eine Einrichtung zum Regeln des Druckes und der Fördermenge einer verstellbaren Pumpe bekanntgeworden, in der ein elektrisches Steuerungssystem vorgesehen ist, das einen mit dem Stellglied der Pumpe gekoppelten Sensor umfaßt, ferner einen Sollstromvorgeber zum Erzeugen eines den Sollwert für den Förderstrom der Pumpe anzeigenden Sollstromsignals, ferner eine Einrichtung zum Kombinieren des Sollstromsignals und des Positionssignals zu einem resultierenden Signal, das eine Sollstellung für das Stellglied angibt, sowie einen Signalumsetzer zum Umsetzen des resultierenden Signals in ein dazu proportionales Druckmittel-Drucksignal, mit dem der Stellantrieb beaufschlagt wird. (FR-A-24 58 840).Furthermore, a device for regulating the pressure and the delivery rate of an adjustable pump has become known, in which an electrical control system is provided, which comprises a sensor coupled to the actuator of the pump, as well as a setpoint current generator for generating a setpoint current signal indicating the setpoint for the delivery flow of the pump , furthermore a device for combining the desired current signal and the position signal to form a resulting signal which indicates a desired position for the actuator, and a signal converter for converting the resulting signal into a pressure medium pressure signal which is proportional thereto and which is applied to the actuator. (FR-A-24 58 840).

Es ist Aufgabe der Erfindung eine Einrichtung zum Regeln des Druckes und der Fördermenge einer verstellbaren Pumpe nach der Gattung des Anspruchs 1 zu schaffen, mit der es möglich ist, die Menge bzw. den Druck einer verstellbaren Pumpe entsprechend einer Sollwertvorgabe so einzustellen, daß der Übergang von einer Mengen- zur Druckregelung verbessert wird, wobei durch einen Istwertvorhalt eine gute Dämpfung und ein gutes Einschwingverhalten erreicht wird.It is an object of the invention to provide a device for regulating the pressure and the delivery rate of an adjustable pump according to the preamble of claim 1, with which it is possible to adjust the amount or pressure of an adjustable pump according to a setpoint specification so that the transition from quantity to pressure control is improved, good damping and good transient behavior being achieved by maintaining the actual value.

Die erfindungsgemäße Lösung dieser Aufgabe ist durch die kennzeichnenden Merkmale des Anspruchs 1 definiert.The achievement of this object is defined by the characterizing features of claim 1.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind Weiterbildungen der im Anspruch 1 angegebenen Merkmale möglich.The measures listed in the dependent claims further developments of the features specified in claim 1 are possible.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Zeichnung zeigt eine Regeleinrichtung für eine verstellbare Pumpe in schematischer Darstellung.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The drawing shows a control device for an adjustable pump in a schematic representation.

Beschreibung des AusführungsbeispielesDescription of the embodiment

In der Zeichnung ist mit 10 eine verstellbare Pumpe bezeichnet, die über eine Saugleitung 11 Druckmittel aus einem Behälter 12 ansaugt und dieses in eine Förderleitung 13 verdrängt. Die Förderleitung 13 führt zu einem Arbeitszylinder 14; in ihr ist ein Wegeventil 15 (Steuerventil) mit drei Schaltstellungen mit stetigem Übergang angeordnet, z. B. ein elektromagnetisch betätigbares Proportionalventil.In the drawing, 10 denotes an adjustable pump, which sucks in pressure medium from a container 12 via a suction line 11 and displaces it into a delivery line 13. The delivery line 13 leads to a working cylinder 14; in it a directional valve 15 (control valve) with three switching positions with a continuous transition is arranged, for. B. an electromagnetically actuated proportional valve.

Das die Fördermenge der Pumpe 10 bestimmende Stellglied 16 z. B. die Schrägscheibe einer Axialkolbenpumpe - wird mit Hilfe zweier einander entgegenwirkender Stellkolben 17, 18 mit ungleich großen Flächen eingestellt Der Stellkolben 18 wird über eine Leitung 19 beaufschlagt, welche von der Förderleitung 13 ausgeht, und zwar von einer Stelle, die stromabwärts des Wegeventils 15 liegt. Der Stellkolben 17 wird über eine Steuerleitung 20 beaufschlagt, die ebenfalls an die Förderleitung 13 angeschlossen ist, und zwar an einer Stelle, die zwischen der Pumpe 10 und dem Wegeventil 15 liegt. In der Schaltstellung 11 des Wegeventils 15 sind sämtliche Anschlüsse gesperrt; in seiner Schaltstellung 1 ist der Arbeitszylinder 14 zu einer zum Behälter führenden Rückleitung 22 verbunden, während in der Schaltstellung 111 Verbindung von der Förderleitung hergestellt ist zum flächengrößeren Stellkolben 18 und zum Arbeitszylinder 14. Der flächenkleinere Stellkolben 17 ist stets vom Förderdruck der Pumpe beaufschlagt.The actuator 16 determining the delivery rate of the pump 10 z. B. the swash plate of an axial piston pump - is set with the help of two opposing actuating pistons 17, 18 with areas of unequal size. The actuating piston 18 is acted upon via a line 19 which starts from the delivery line 13, specifically from a point downstream of the directional control valve 15 lies. The actuating piston 17 is acted upon by a control line 20, which is also connected to the delivery line 13, specifically at a point which lies between the pump 10 and the directional control valve 15. In the switching position 11 of the directional control valve 15, all connections are blocked; In its switching position 1, the working cylinder 14 is connected to a return line 22 leading to the container, while in the switching position 111 a connection is made from the delivery line to the larger-area actuating piston 18 and to the working cylinder 14. The smaller-area actuating piston 17 is always acted upon by the delivery pressure of the pump.

Das Wegeventil 15 wird durch einen Elektromagneten 23 eingestellt, der über eine elektrische Leitung 24 mit einem elektronischen Steuergerät 25 verbunden ist, von dem eine erste elektrische Leitung 26 zu einem elektronischen Mengenbegrenzer 27 führt und eine zweite elektrische Leitung 28 zu einem Wegaufnehmer 29 des Wegeventils 15. Der Wegaufnehmer 29 signalisiert laufend die Position des Wegeventils 15 dem elektronischen Steuergerät 25; dieses wiederum gibt durch ein von der Leitung 26 empfangenes Signal entsprechend verarbeitete Werte über die Leitung 24 dem Elektromagneten 23 vor, der das Wegeventil 15 entsprechend einstellt.The directional control valve 15 is set by an electromagnet 23, which is connected via an electrical line 24 to an electronic control unit 25, from which a first electrical line 26 leads to an electronic flow limiter 27 and a second electrical line 28 to a position transducer 29 of the directional control valve 15 The position sensor 29 continuously signals the position of the directional valve 15 to the electronic control unit 25; this in turn specifies, by means of a signal received from line 26, correspondingly processed values via line 24 to electromagnet 23, which adjusts directional valve 15 accordingly.

An die Förderleitung 13 ist ein elektrischer Druckgeber 31 angeschlossen, der über eine elektrische Leitung 32 einem Istwertvorhalt 33 und über eine Leitung 42 den differenzierten Druck-Istwert zu einem Regelverstärker 35 führt. Von der elektrischen Leitung 32 zweigt eine elektrische Leitung 34 ab, die ebenfalls zum Regelverstärker 35 führt, dem über einen Eingang 36 der von der Pumpe zu erzeugende DruckSollwert P eingegeben wird. Der Mengenbegrenzer27 hat eine 3 Eingabe 37, über die ihm die von der Pumpe bereitzustellende Fördermenge eingegeben wird; er begrenzt gleichzeitig deren maximale Fördermenge. Weiterhin ist in der Regeleinrichtung eine Nachführung 39 vorgesehen, welche den Regelverstärker 35 mit dem Mengenbegrenzer 27 in Wirkverbindung bringt. In den einzelnen Einheiten 33, 35, 27 und 39 sind diverse Verstärker, Widerstände und Kondensatoren enthalten, auf deren Wirkungsweise im einzelnen nicht eingegangen ist, da dies nicht zum besseren Verständnis der Erfindung beiträgt Erwähnt sei lediglich eine Diode 40 im Istwertvorhalt 33, auf deren Funktion weiter unten eingegangen ist.An electrical pressure transmitter 31 is connected to the delivery line 13 and leads an actual value reserve 33 via an electrical line 32 and the differentiated actual pressure value to a control amplifier 35 via a line 42. An electrical line 34 branches off from the electrical line 32 and also leads to the control amplifier 35, to which the pressure setpoint P to be generated by the pump is input via an input 36. The quantity limiter 27 has a 3 input 37, via which the delivery volume to be provided by the pump is input; it also limits their maximum Output. Furthermore, a tracking 39 is provided in the control device, which brings the control amplifier 35 into operative connection with the quantity limiter 27. The individual units 33, 35, 27 and 39 contain various amplifiers, resistors and capacitors, the mode of operation of which has not been discussed in detail, since this does not contribute to a better understanding of the invention. Only one diode 40 in the actual value reserve 33 is mentioned Function is discussed below.

Der Arbeitszylinder 14 ist einfach wirkend ausgebildet und stellt im Ausführungsbeispiel den Druckzylinder einer Spritzgießmaschine dar. Dabei ist der Geschwindigkeits- und Druckverlauf am Arbeitszylinder 14 von Bedeutung. Unter Geschwindigkeitsverlauf ist dabei auf die Vorschubbewegung des Kolbens Bezug genommen. Die Aufgabe des Wegeventils 15 ist es, die Fördermenge bzw. den Förderdruck der Pumpe entsprechend den obengenannten Sollwertvorgaben einzustellen. Solange der Mengenbegrenzer27 nicht wirksam ist, setzt sich die Sollwertmenge M unverändert durch. Das elektronische Steuergerät wird mit diesem Wert angesteuert und das Wegeventil entsprechend des Sollwerts positioniert. Wenn der Stellkolben 18 über die Steuerleitung 19 mit der Förderleitung 13 vor dem Wegeventil verbunden ist, überwiegt die Kraft an diesem - da seine Fläche größer ist - so daß die Kraft am Kolben 17 überwunden wird und die Pumpe 10 auf größere Fördermenge eingestellt wird. Über diesen Stellkolben wird eine konstante Druckdifferenz und- somit eine dem Sollwert proportionale Mengenverstellung der Pumpe erreicht.The working cylinder 14 is designed to be single-acting and in the exemplary embodiment represents the pressure cylinder of an injection molding machine. The speed and pressure curve on the working cylinder 14 is important. The speed curve refers to the feed movement of the piston. The function of the directional control valve 15 is to adjust the delivery quantity or the delivery pressure of the pump in accordance with the above-mentioned setpoint specifications. As long as the quantity limiter 27 is not effective, the setpoint quantity M prevails unchanged. The electronic control unit is controlled with this value and the directional control valve is positioned according to the setpoint. If the control piston 18 is connected via the control line 19 to the delivery line 13 in front of the directional control valve, the force on this - because its area is larger - prevails so that the force on the piston 17 is overcome and the pump 10 is set to a larger delivery rate. A constant pressure difference and thus a quantity adjustment of the pump proportional to the setpoint is achieved via this control piston.

Am Regelverstärker 35 werden Drucksoll- und Istwertverglichen, und nach entsprechenderVerstärkung wirkt dieses Signal auf den Mengenbegrenzer 27 und korrigiert dem Sollwert der Fördermenge so lange, bis der am Druckgeber 31 festgestellte Istwert dem an der Eingabe 36 eingegebenen Drucksollwert entsprichtThe pressure setpoint and actual value are compared at the control amplifier 35, and after appropriate amplification, this signal acts on the quantity limiter 27 and corrects the setpoint of the delivery quantity until the actual value determined on the pressure transmitter 31 corresponds to the pressure setpoint entered at the input 36

Um auch bei kleinen Differenzen zwischen Drucksoll- und Istwert noch die eingestellte Menge zu erreichen, ist es notwendig, im Regelverstärker 35 eine hohe statische Verstärkung zu erreichen. Da dies nicht mit reiner proportionaler Verstärkung möglich ist, weist dieser ein integrales Verhalten auf. Dieses führt dazu, daß der Regler bei Soll-Istdifferenz in die Stellgrenze läuft. Durch die Nachführung 39 des Regelverstärkers 35 wird erreicht, daß dessen Stellgröße nicht größer als der Sollwert « Fördermenge » werden kann und somit bei Gleichheit von Drucksoll-und Druckistwert der Regler unverzüglich die Mengenvorgabe zurücknimmt.In order to achieve the set quantity even with small differences between the pressure setpoint and actual value, it is necessary to achieve a high static gain in the control amplifier 35. Since this is not possible with a purely proportional gain, this has an integral behavior. This causes the controller to run within the control limit if the target / actual difference is reached. The adjustment 39 of the control amplifier 35 ensures that its manipulated variable cannot become larger than the “delivery quantity” setpoint and, if the pressure setpoint and actual pressure value are the same, the controller immediately withdraws the quantity specification.

Durch den Istwertvorhalt 33 wird eine zusätzliche Dämpfung und damit ein besseres Einschwingverhalten des Drukkes erreicht. Mit dem Widerstand 41 und der Diode 40 läßt sich die Dämpfung richtungsabhängig einstellen; somit kann diese dem unterschiedlichen Verhalten der Regelstrecke optimal angepaßt werden. Damit werden erhebliche Verbesserungen gegenüber bisherigen Einrichtungen erreicht.Additional damping and thus better transient response of the pressure is achieved by the actual value reserve 33. With the resistor 41 and the diode 40, the damping can be set depending on the direction; Thus, this can be optimally adapted to the different behavior of the controlled system. This will result in significant improvements over previous facilities.

Anstelle der zwei Stellkolben 17, 18 ist es auch möglich, nur einen Stellkolben vorzusehen und als Gegenkraft eine Feder einzusetzen. Solche Stellvorrichtungen sind hinlänglich bekannt und nicht erfindungswesentlich.Instead of the two actuating pistons 17, 18, it is also possible to provide only one actuating piston and to use a spring as a counterforce. Such actuators are well known and not essential to the invention.

Claims (3)

1. Device for regulating the pressure and the capacity of a variable-capacity pump (10), the final control element (16) of which is adjustable by means of a pressure-stressed piston (18) controlled through a control valve (15), whereby a constant pressure difference is achieved through the control valve (15), and having an electrical control device to regulate the capacity and the pressure of the pump, the actual pressure value being determined by a pressure transducer (31) connected to the delivery pipe (13) of the pump, characterized in that the actual pressure value (31) prevailing in the delivery pipe (13) is fed as an electrical signal parallel is also fed, to an actual pressure value lead (33) to an electrical regulating amplifier (35), to which the desired pressure value (P), in that the desired capacity value (M) is fed to a capacity limiter (27) which, through an electronic position control (25), adjusts the control valve (15), the position of which corresponding to the capacity is likewise fed as an electrical signal (29) to the electronic position control (25), and in that desired pressure value and actual pressure value are compared in the regulating amplifier (35), taking into account the actual pressure value lead, and its actuating variable is conveyed to the capacity limiter (27) and the output variable (26) of the capacity limiter (27) is corrected until the capacity limiter has established the desired pressure value by corresponding adjustment of the capacity, and in that the actuating variable of the regulating amplifier (35), due to a follow-up unit (39) connected between the latter and the capacity limiter (27), cannot be greater than the desired value of the capacity.
2. Device according to Claim 1, characterized in that an actual value lead unit (33) adjusts a directional damping means formed by a diode (40) and resistors (41).
3. Device according to Claim 1 or 2, characterized in that the position of the control valve (15), and therefore the actual value of the capacity, is determined by a position sensor (29) connected to the control valve.
EP85105969A 1984-06-14 1985-05-15 Device for regulating the pressure and the capacity of a variable-capacity pump Expired - Lifetime EP0164602B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85105969T ATE46561T1 (en) 1984-06-14 1985-05-15 DEVICE FOR ADJUSTING THE PRESSURE AND DELIVERY OF AN ADJUSTABLE PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843422089 DE3422089A1 (en) 1984-06-14 1984-06-14 DEVICE FOR REGULATING THE PRESSURE AND FLOW RATE OF AN ADJUSTABLE PUMP
DE3422089 1984-06-14

Publications (4)

Publication Number Publication Date
EP0164602A2 EP0164602A2 (en) 1985-12-18
EP0164602A3 EP0164602A3 (en) 1987-12-16
EP0164602B1 EP0164602B1 (en) 1989-09-20
EP0164602B2 true EP0164602B2 (en) 1994-12-28

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EP85105969A Expired - Lifetime EP0164602B2 (en) 1984-06-14 1985-05-15 Device for regulating the pressure and the capacity of a variable-capacity pump

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US (1) US4708596A (en)
EP (1) EP0164602B2 (en)
JP (1) JP2654770B2 (en)
AT (1) ATE46561T1 (en)
DE (2) DE3422089A1 (en)

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JP2654770B2 (en) 1997-09-17
DE3422089A1 (en) 1985-12-19
JPS614881A (en) 1986-01-10
EP0164602A2 (en) 1985-12-18
DE3573150D1 (en) 1989-10-26
US4708596A (en) 1987-11-24
EP0164602A3 (en) 1987-12-16
ATE46561T1 (en) 1989-10-15
EP0164602B1 (en) 1989-09-20

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