EP0528103B2 - Elektrohydraulische Stelleinheit - Google Patents
Elektrohydraulische Stelleinheit Download PDFInfo
- Publication number
- EP0528103B2 EP0528103B2 EP92104566A EP92104566A EP0528103B2 EP 0528103 B2 EP0528103 B2 EP 0528103B2 EP 92104566 A EP92104566 A EP 92104566A EP 92104566 A EP92104566 A EP 92104566A EP 0528103 B2 EP0528103 B2 EP 0528103B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- control
- force
- travel
- main piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- 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
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
- F15B13/0435—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being sliding valves
-
- 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
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
-
- 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
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
-
- 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
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
- F15B13/0433—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being pressure control valves
-
- 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
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
Definitions
- the invention relates to an electro-hydraulic control unit, in particular for control of construction machinery, according to the generic part of the first claim.
- an electro-hydraulic actuator is known, the one displaceable piston-like part, in particular has a control slide whose two end faces each have a control chamber arranged via control means can be pressurized or relieved of pressure to move the part is.
- the control means is an electro-magnetic associated with each control chamber actuatable control valve, which is mechanically fed back to the control valve acts.
- the mechanical feedback is designed as a spring that each on the mutually facing end faces of the movable part and Control valve supports. Further centering springs are provided for the piston-like part.
- This control unit is intended to provide feedback for the position control of the displaceable Part can be achieved, the setting should be particularly accurate.
- the Control valves are designed as 3/2-way valves.
- a disadvantage of this control unit is that due to the interaction a pressure of the magnetic force and spring force is set on the valve (after which Current divider principle), which over the surface of the movable part as adjusting force works. It follows that the control pressure only with constant proportional magnetic force is still set depending on the spool position, i.e. there is one Slider position only one setting value. But since the disturbances occurring which occur in a wide range adjust the spool must be constant Magnetic force, the control pressure can be adjusted in a wide range to be able to position the piston correctly. In addition, this actuator unit efficiency is poor because the control oil volume flow requirement is high due to the flow divider function for control pressure generation, furthermore is a high one Control pressure is required as the main piston is moved against a spring. As a result of the constant pressure, there is a high loss of performance due to the circulating oil.
- DE-C 28 35 771 shows a cartridge valve with a device its control by means of a hydraulic tracking system consisting of a Cartridge element for regulating a main flow valve flowing through hydraulic volume flow, with an inlet throttle between the flow Main power connection and the control side of the cartridge element and with one interacting via a linkage with an adjustable discharge throttle Pilot piston of a pilot valve and with a control valve for actuation of the pilot piston.
- the control valve forms an independent control device to connect the incoming main power connection with the upper or Bottom of the pilot piston with a return line leading the pilot piston moved proportional to a control signal, the control device with a Connection via a pipe to the top or bottom of the pilot spool and with a further connection via a pipeline to the other side of the Pilot piston is connected.
- a disadvantage of this design is that that only two positions can be brought about by this cartridge valve and a positioning of the main piston within the Housing is not feasible.
- DE-A 28 30 332 is an electro-hydraulic valve unit, known according to the preamble of claim 1 with a proportional servo valve, one with this coupled directional control valve for control a working cylinder and with an electro-mechanical converter for generation a linearly dependent force for the adjustment of the electrical input signal of the servo valve is known, the directional control valve having a valve spindle, which is a neutral position, a first working position for connecting one Fluid pressure source with a chamber of the working cylinder and a second working position to connect this chamber to the sump.
- the valve stem of the Directional control valve is coupled to the valve stem of the servo valve via a spring.
- a second spring On the other side of the valve stem of the servo valve is a second spring arranged and counteracts the first spring.
- the spring constant of the second Spring is larger than that of the first, the second spring being arranged so that in de-energized state of the electro-mechanical converter the valve spindle of the servo valve is in its neutral position.
- the spring constant of the second spring can be here be greater by a factor of 5-12 than the spring constant of the first spring.
- the change in force of the magnetic core with respect to the change in Position of the same is always smaller than the combined spring constants of the compression springs, so that the magnet, when excited, does not move to its maximum position can move.
- a variety of different spring constants are used having springs, so that one of disturbances of individual or all springs independent positioning of the main piston within the housing is not can be realized.
- the object of the invention is the further development of the generic electrohydraulic Actuator in that a closed position control loop is formed is the, even with occurring disturbances such as flow forces, pressure changes and the like. With high setting accuracy or reproducibility of position and speed of the components to be controlled can be maintained.
- the field of application of the subject matter of the invention essentially relates to control of hydraulic cylinders and hydraulic motors in the stationary industrial sector, whereby a preferred area of application is formed by the mobile construction machinery area becomes.
- FIG. 2 shows a schematic diagram of the electro-hydraulic actuating unit according to the invention, which essentially contains the following components: a longitudinally movable main piston 2 within a housing 1, a pilot valve 3 together with piston 4, electromagnets 5, 6 and a spiral spring 7 (can also be a different type of spring) as a displacement-force converter.
- the pilot valve 3 is a directionally proportional 4/3 valve. Through the electronic control of the magnet 6, for example, the valve 3 opens the connection P to A and B to T.
- the piston 4 moves in the direction of the main piston 2 and the control oil flows into the control chamber 8 and moves the main piston 2 in the direction of the piston 4.
- the main piston 2 is connected via the spiral spring 7 designed as a compression spring to the piston 4 of the pilot valve 3, in such a way that it is attached to the mutually facing end faces 9, 10 of the two pistons 2, 4.
- the main piston 2 is adjusted until the compression spring 7 has adjusted due to its characteristic curve so that the spring force of the compression spring 7 and the magnetic force of the magnet 6 are in equilibrium. This means that the main piston 2 closes the piston 4 of the pilot valve 3 via the compression spring 7. Any positive or negative positional deviation of the main piston 2 causes a force imbalance between the compression spring 7 and the electronic magnetic force, so that the piston 4 moves into the control position until the main piston 2 is positioned again.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Servomotors (AREA)
- Fluid-Pressure Circuits (AREA)
Description
- hohe Stellgenauigkeit von Hydrauliksystemen bei robuster, unempfindlicher Ausführung des Regelkreises,
- Optimierung des Energiehaushaltes,
- Verwendung geringerer Anzahl von Steuermitteln,
- kein Ölumlauf im ausgeregelten Zustand,
- störgrößenunabhängige Positioniergenauigkeit des Hauptkolbens
- Erhöhung der Feinsteuerbarkeit.
- Figur 1 -
- Blockschaltbild
- Figur 2 -
- Prinzipskizze der Anordnung bzw. Verknüpfung der erfindungsgemäßen Stelleinheit.
- s
- = Weg des Hauptkolbens
- A
- = Additionsstelle Magnet + Feder
- FStör
- = Störkräfte auf den Hauptkolben
- FSt
- = Stellkräfte
- pSt
- = Steuerdruck
- F
- = Kraftdifferenz am Steuerkolben
- FR
- = Kraft der Regelfeder
- FI
- = Kraft des Proportionalmagneten
einen innerhalb eines Gehäuses 1 in Längsrichtung bewegbaren Hauptkolben 2, ein Vorsteuerventil 3 samt Kolben 4, Elektro-Magnete 5,6 sowie eine Spiralfeder 7 (kann auch eine andersgeartete Feder sein) als Weg-Kraft-Wandler. Das Vorsteuerventil 3 ist ein wege-proportionales 4/3-Ventil. Durch die elektronische Ansteuerung beispielsweise des Magneten 6 öffnet das Ventil 3 die Verbindung P nach A und B nach T. Hierbei bewegt der Kolben 4 sich in Richtung des Hauptkolbens 2 und das Steueröl fließt in die Steuerkammer 8 und bewegt den Hauptkolben 2 in Richtung des Kolbens 4. Der Hauptkolben 2 ist über die als Druckfeder ausgebildete Spiralfeder 7 mit dem Kolben 4 des Vorsteuerventils 3 verbunden, dergestalt, daß sie an den einander zugewandten Stirnseiten 9,10 der beiden Kolben 2,4 befestigt ist. Der Hauptkolben 2 wird solange verstellt, bis sich die Druckfeder 7 aufgrund ihrer Kennlinie so eingestellt hat, daß die Federkraft der Druckfeder 7 und die magnetische Kraft des Magneten 6 im Gleichgewicht befinden. Dies bedeutet, daß der Hauptkolben 2 über die Druckfeder 7 den Kolben 4 des Vorsteuerventils 3 schließt. Jede positive oder negative Positionsabweichung des Hauptkolbens 2 bedingt ein Kräfteungleichgewicht zwischen Druckfeder 7 und elektronischer Magnetkraft, so daß der Kolben 4 in Regelstellung geht, bis der Hauptkolben 2 wieder positioniert ist.
Claims (5)
- Elektro-hydraulische Stelleinheit, insbesondere zur Steuerung von Baumaschinen, mit einem verschiebbaren Hauptkolben, an dessen Stirnseiten Steuerkammern vorgesehen sind, die über elektro-magnetisch betätigbare Steuermittel mit Druckmittel beaufschlagbar bzw. entlastbar sind, wobei durch ein einziges mittels zweier Elektro-Magnete (5,6) betätigbares Steuermittel (3) in Form eines Vorsteuer-Wegeventils (3), das mit dem Hauptkolben (2) in Reihe angeordnet ist sowie mindestens einen Weg-Kraft-Wandler (7), der in Wirkverbindung mit dem Hauptkolben (2) und einem Kolben (4) des Vorsteuer-Wegeventils (3) steht, durch Betätigen eines der Elektro-Magnete (5 oder 6) über das Vorsteuer Wegeventil (3) Steueröl in die zugehörige Steuerkammer (8 oder 9) fließt dadurch gekennzeichnet, daß das Vorsteuer-Wegeventil (3) ein Wegeproportionales Ventil ist, und daß der Weg-Kraft-Wandler (7) mit den einander zugewandten Stirnseiten (9, 10) des Hauptkolbens (2) sowie des Kolbens, (4) des Vorsteuer-Wegeventils (3) verbunden ist, wobei der Hauptkolben (2) in die entsprechende Richtung (s) und der Kolben (4) des Vorsteuer-Wegeventils (3) über den Weg-Kraft-Wandler (7) durch den Hauptkolben (2) solange bewegt werden, bis die Federkraft des mit den Kolben (2, 4) verbundenen Weg-Kraft-Wandlers (7) und die magnetische Kraft im Gleichgewicht sind, und wobei ein geschlossener Lageregelkreis, unabhängig von Störgrößen, dadurch gebildet wird, daß bei jeder Positionsabweichung des Hauptkolben (2) ein Kräfteungleichgewicht zwischen der Federkraft des mit den Kolben (2, 4) verbundenen Weg-Kraft-Wandlers (7) und der elektrischen Magnetkraft sich einstellt, wobei der Kolben (4) in Regelstellung geht, bis der Hauptkolben (4) störgrößenunabhängig wieder positioniert ist.
- Elektrohydraulische Stelleinheit nach Anspruch 1,
dadurch gekennzeichnet, daß der mit den Kolben (2, 4) verbundene Weg-Kraft-Wandler (7) als Spiralfeder ausgebildet ist. - Elektrohydraulische Stelleinheit nach Anspruch 2
dadurch gekennzeichnet, daß die Spiralfeder (7) eine Druckfeder ist. - Elektrohydraulische Stelleinheit nach Anspruch 2
dadurch gekennzeichnet, daß die Spiralfeder (7) eine kombinierte Zug-Druck-Feder ist. - Elektrohydraulische Stelleinheit nach Anspruch 2,
dadurch gekennzeichnet, daß der mit den Kolben (2, 4) verbundene Weg- Kraft- Wandler (7) als Tellerfeder ausgebildet ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4124140A DE4124140C2 (de) | 1991-07-20 | 1991-07-20 | Einrichtung zur lagegerechten Positionierung des Hauptkolbens einer elektro-hydraulischen Stelleinheit |
| DE4124140 | 1991-07-20 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0528103A1 EP0528103A1 (de) | 1993-02-24 |
| EP0528103B1 EP0528103B1 (de) | 1995-10-11 |
| EP0528103B2 true EP0528103B2 (de) | 2000-06-28 |
Family
ID=6436652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92104566A Expired - Lifetime EP0528103B2 (de) | 1991-07-20 | 1992-03-17 | Elektrohydraulische Stelleinheit |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0528103B2 (de) |
| DE (2) | DE4124140C2 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4302130C2 (de) * | 1993-01-27 | 1995-04-13 | Orenstein & Koppel Ag | Elektro-hydraulische Stelleinheit |
| US5921279A (en) * | 1998-04-29 | 1999-07-13 | Husco International, Inc. | Solenoid operated dual spool control valve |
| DE19823529A1 (de) * | 1998-05-26 | 1999-12-09 | Mannesmann Rexroth Ag | Wegbestimmungssystem |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3783901A (en) † | 1972-03-20 | 1974-01-08 | Bosch Gmbh Robert | Electro hydraulic control unit |
| DE2830332A1 (de) † | 1977-07-11 | 1979-01-25 | Cessna Aircraft Co | Elektro-hydraulische ventileinheit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2835771A1 (de) * | 1978-08-16 | 1980-02-28 | Schwelm & Towler Hydraulics | Anordnung zur aussteuerung eines cartridgeelementes |
| DE3125386A1 (de) * | 1981-06-27 | 1983-01-13 | Robert Bosch Gmbh, 7000 Stuttgart | Elektro-hydraulische stelleinrichtung insbesondere zur fernsteuerung eines wegeventils |
| DE3527026A1 (de) * | 1985-07-27 | 1987-01-29 | Bosch Gmbh Robert | Elektrohydraulische stelleinheit |
-
1991
- 1991-07-20 DE DE4124140A patent/DE4124140C2/de not_active Expired - Fee Related
-
1992
- 1992-03-17 DE DE59203972T patent/DE59203972D1/de not_active Expired - Fee Related
- 1992-03-17 EP EP92104566A patent/EP0528103B2/de not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3783901A (en) † | 1972-03-20 | 1974-01-08 | Bosch Gmbh Robert | Electro hydraulic control unit |
| DE2830332A1 (de) † | 1977-07-11 | 1979-01-25 | Cessna Aircraft Co | Elektro-hydraulische ventileinheit |
Non-Patent Citations (1)
| Title |
|---|
| Prospect Nr. 625 D 1.80 der Firma MOOG GmbH mit der Titel: "Servoverstellgeräte für Verstellpumpen und Verstellmotoren" † |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0528103B1 (de) | 1995-10-11 |
| EP0528103A1 (de) | 1993-02-24 |
| DE59203972D1 (de) | 1995-11-16 |
| DE4124140C2 (de) | 1995-04-13 |
| DE4124140A1 (de) | 1993-01-21 |
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