EP0907031B1 - Dispositif de commande d'un vérin hydraulique d'une moissonneuse automotrice - Google Patents

Dispositif de commande d'un vérin hydraulique d'une moissonneuse automotrice Download PDF

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Publication number
EP0907031B1
EP0907031B1 EP19980115143 EP98115143A EP0907031B1 EP 0907031 B1 EP0907031 B1 EP 0907031B1 EP 19980115143 EP19980115143 EP 19980115143 EP 98115143 A EP98115143 A EP 98115143A EP 0907031 B1 EP0907031 B1 EP 0907031B1
Authority
EP
European Patent Office
Prior art keywords
variable displacement
displacement pump
valve
control unit
hydraulic cylinder
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
Application number
EP19980115143
Other languages
German (de)
English (en)
Other versions
EP0907031A3 (fr
EP0907031A2 (fr
Inventor
Günter Eis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Claas Selbstfahrende Erntemaschinen GmbH
Original Assignee
Claas Selbstfahrende Erntemaschinen GmbH
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 Claas Selbstfahrende Erntemaschinen GmbH filed Critical Claas Selbstfahrende Erntemaschinen GmbH
Publication of EP0907031A2 publication Critical patent/EP0907031A2/fr
Publication of EP0907031A3 publication Critical patent/EP0907031A3/fr
Application granted granted Critical
Publication of EP0907031B1 publication Critical patent/EP0907031B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members

Definitions

  • the invention relates to a device for controlling a hydraulic cylinder in a self-propelled harvester with a variable displacement pump for conveying a hydraulic fluid and at least one associated with the hydraulic cylinder valve.
  • a device for controlling a hydraulic cylinder in a self-propelled harvester with a variable displacement pump for conveying a hydraulic fluid and at least one associated with the hydraulic cylinder valve is known from US-A-5,249,421 known.
  • variable displacement and proportional directional control valves For the actuation of hydraulic cylinders, which, for example, a header of a harvester or a conveyor is assigned to the same, a hydraulic control circuit is known, the variable displacement and proportional directional control valves and adjusts depending on the respective needs of a consumer connected to the hydraulic cylinder, a corresponding delivery volume.
  • the object of the invention is therefore to provide a device for controlling a hydraulic cylinder in a self-propelled harvester, which ensures a simple way a cost effective and effective control of hydraulic cylinders.
  • the invention is characterized in that the valve is designed as a switching valve and that the switching valve and the variable displacement pump are electrically controlled so that the delivery of the variable displacement pump is adapted to the needs of the hydraulic cylinder.
  • the particular advantage of the invention is the fact that, on request, the required delivery volume for actuating the hydraulic cylinder can be provided quickly and to a sufficient extent. This is made possible by the combination of a fast-switching switching valve and a variable displacement pump, which are each electrically actuated.
  • variable displacement pump on the one hand and the switching valve on the other hand connected to an electrical control unit having means for generating actuating signals in response to a predetermined actuation signal.
  • the electric control unit allows a demand-driven control of the variable, so that centrally a consumer-dependent control of the corresponding associated hydraulic cylinder is effected.
  • the electrical control unit generates a pump control signal which enables a continuous adjustment of the delivery volume delivered by the variable displacement pump.
  • the electrical control unit has means for storing cams for a plurality of hydraulic cylinders, so that hydraulic cylinders can be automatically operated in a predetermined order.
  • the switching valves are each preceded by a flow valve, by means of which the delivery flow directed to the respective hydraulic cylinders can be adjusted.
  • a flow control valve is designed as a 3-way flow control valve, which is assigned to a first hydraulic cylinder, wherein a constant volume flow is diverted to further hydraulic cylinders.
  • the device according to the invention can be used to actuate consumers of self-propelled harvesting machines.
  • a harvester attachment can be moved in the vertical direction or pivoted about a horizontal axis.
  • the device for operating a pivotable grain tank outlet pipe, conveyor or inclined conveyor for the crop or for the pivoting of a mounted chopper can be used as a consumer.
  • the device has a single hydraulic cylinder 1 for actuating a consumer.
  • a variable displacement pump 2 is provided for conveying a hydraulic fluid in a delivery line 3 from a tank 4 to a switching valve 5.
  • the switching valve 5 is connected by means of a further delivery line 6 to a terminal of the hydraulic cylinder 1.
  • a connected on the opposite side of the hydraulic cylinder 1 drain line 7 leads the hydraulic fluid without pressure via the switching valve 5 back to the tank. 4
  • the hydraulic cylinder 1 has a piston rod 8 with a piston 9 adjoining it at the same end, which are movably mounted in the hydraulic cylinder 1.
  • a free end of the piston rod 8 extends outside of the hydraulic cylinder 1 and is operatively connected to a consumer, not shown.
  • the variable displacement pump 2 is designed as an axial piston pump and is electrically actuated.
  • the variable displacement pump 2 is electrically connected by an electrical line 10 to an electrical control unit 11.
  • the switching valve 5 is designed as a 4/3-way valve and electromagnetically actuated.
  • the switching valve 5 has an electrical connection line 12 to the electrical control unit 11.
  • the control unit 11 is electrically connected on the input side with a key element 13, which is preferably arranged in a cab of the harvester.
  • a consumer connected to the hydraulic cylinder 1 can be pivoted into a predetermined position.
  • the key element 13 outputs an actuating signal to the control unit 11, which has means for generating a pump control signal on the one hand and for generating a valve control signal on the other hand.
  • the pump control signal is transmitted via the electric line 10 to the variable displacement pump 2, wherein the size of the pump control signal corresponds to a consumer-dependent volume flow.
  • the valve actuating signal acting on the switching valve 5 via the electrical connection line 12 switches the valve 5 such that the piston 9 is moved in a predetermined direction.
  • control unit 11 can also serve to control a plurality of variable displacement pumps 2 or switching valves 5, wherein consumer-dependent data are assigned to the respective variable displacement pumps 2 and valves 5.
  • electrical control unit 11 has an integrated circuit.
  • an electrical control unit 15 which serves for controlling a variable displacement pump 16 and a plurality of switching valves 17, 17 ', 17 ".
  • the control unit 15 via a control line 18 with the variable displacement pump 16 and control lines 19, 19', 19" with
  • the variable displacement pump 16 is connected on the pressure side to a 3-way flow control valve 20 whose first output is connected via the switching valve 17 to a first hydraulic cylinder 21.
  • a second output of the 3-way flow control valve 20 is connected to a second hydraulic cylinder 21 'and a third hydraulic cylinder 21 "respectively via a 2-way flow control valve 22, 22' and corresponding switching valves 17 ', 17".
  • the 3-way flow control valve 20 is configured such that a constant flow in the direction of the two hydraulic cylinders 21 ', 21 "is branched off, wherein the 2-way flow control valves 22, 22' a uniform distribution on the hydraulic cylinder 21 ', the second 1 "effect.
  • the control unit 15 each with a key element 23, a lever member 24 and a multi-function handle 25 connected as input elements.
  • These input elements 23, 24, 25 are in each case associated with a hydraulic cylinder 21, 21 ', 21 ".
  • a pump control signal directed to the variable displacement pump 16 takes place at such a height that a demand-based volume flow is generated which is conveyed to the hydraulic cylinder 21 via a switching valve 17 addressed by means of a valve actuating signal of the control unit 15.
  • a correspondingly higher pump control signal is delivered to the variable displacement pump 16.
  • the 3-way Flow control valve 20 in conjunction with the 2-way flow control valves 22, 22 'ensures a uniform distribution of the volume flow to the hydraulic cylinders 21, 21', 21 ".
  • a sensor 26 may be electrically connected to the electrical control unit 15 so that a specific hydraulic cylinder 21, 21 ', 21 "is addressed as a function of a sensor signal Control unit 15 a correspondingly long pump control signal of a certain height and a corresponding valve associated valve control signal is generated so that the corresponding associated with the cutting hydraulic cylinder can ensure a certain height of cut
  • consumer-dependent control data can be stored in a memory of the microcontroller 28 when the change is made or extension of the actuated consumers can be used.
  • the senor 26 together with the multi-function handle 25 act on a first hydraulic cylinder 21.
  • the sensor signal causes a default setting of the cutting unit in the presence of a bump.
  • the operator can readjust the direction of the cutting mechanism movement by pivoting a handle 29 of the multi-function handle 25 in one or in an opposite direction.
  • the sensor 26 in cooperation with the control unit 15 as an actuator, while later or simultaneously an accurate adjustment of the consumer is made manually. In this way, it is possible to respond more quickly to external disturbances, whereby the operator is relieved of his concentration.
  • the multi-function handle 25 may be connected to the control unit 15 such that by pressing a button 30 of the multi-function handle 25 a hydraulic actuator 21 controlling pump control signal is delivered, while by pivoting the handle 29 additionally the speed of movement of the piston 9 of the hydraulic cylinder 21st being affected. For example, by moving the handle 29 from a zero forward position, an increased speed of the piston in a first direction and movement of the handle 29 rearwardly may cause an increased speed of the piston in an opposite direction.
  • a corresponding pump control signal to the Pump delivered which is infinitely adjustable and generates a correspondingly adapted volume flow.
  • circuitry connection of the variable displacement pump 2 on the one hand with the Sachltventil 5 on the other hand is that noise due to movements of the hydraulic lines 3, 6, 7 or further largely avoided in strong pressure fluctuations in the hydraulic circuit.
  • the invention is not limited to the specified number of hydraulic cylinders. Of course, other consumers can be connected to the hydraulic circuit, with appropriate flow control valves are connected upstream.
  • variable displacement pump 2 can be controlled by a ramp-shaped pump control signal, wherein a predetermined piston stroke of the variable displacement pump 2 is fixed. The piston of the variable displacement pump 2 is moved in this case in one direction and then in the opposite direction after a certain characteristic. Thereafter, the corresponding switching valve can be switched off.
  • variable displacement pump 2 Due to the high frequency of the variable displacement pump 2, which corresponds to the switching time of the switching valve, the variable displacement pump 2 can be swung back into the zero stroke within the switching time of the switching valve.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Claims (9)

  1. Dispositif de commande de plusieurs vérins hydrauliques dans une moissonneuse automotrice avec une pompe à cylindrée variable pour le refoulement d'un liquide hydraulique et avec respectivement au moins une soupape associée aux vérins hydrauliques,
    caractérisé en ce
    que la soupape est réalisée comme une soupape de commutation (5, 17, 17', 17") et en ce que la soupape de commutation (5, 17, 17', 17") et la pompe à cylindrée variable (2, 16) peuvent être commandées électriquement de telle sorte que le volume aspiré fourni par la pompe à cylindrée variable (2, 16) soit adapté au besoin respectif des vérins hydrauliques (1, 21, 21', 21"), à chaque vérin hydraulique (21, 21', 21") étant associée respectivement une soupape de régulation de débit (20, 22, 22').
  2. Dispositif selon la revendication 1, caractérisé en ce que la pompe à cylindrée variable (2, 16) et la soupape de commutation (5, 17, 17', 17") sont reliées électriquement à une unité de commande électrique (11, 15) qui présente des moyens pour la génération de signaux de réglage en fonction d'un signal d'actionnement prescrit d'un élément de saisie (23, 24, 25).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'unité de commande (11, 15) transmet un signal de réglage de pompe à la pompe à cylindrée variable (2, 16) de sorte que cette dernière génère en continu un débit volumétrique aspiré correspondant en fonction de la taille du signal de réglage de pompe.
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'au vérin hydraulique (21, 21', 21") est associée respectivement une soupape de régulation de débit (20, 22, 22').
  5. Dispositif selon la revendication 4, caractérisé en ce qu'à une seule pompe à cylindrée variable (16) sont raccordés plusieurs vérins hydrauliques (21, 21', 21"), une soupape de régulation de débit associée à un premier vérin hydraulique (21) étant réalisée comme une soupape de régulation de débit à trois voies (20) et les autres soupapes de régulation de débit associées respectivement aux vérins hydrauliques (21', 21") étant réalisées comme des soupapes de régulation de débit à deux voies (22, 22').
  6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'unité de commande électrique (11) présente un circuit de commutation intégré qui transmet les fonctions de commande déclenchées par un élément de saisie (13) à la pompe à cylindrée variable (2).
  7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'unité de commande électrique (15) présente un microcontrôleur qui génère en fonction du nombre et du type de récepteurs à actionner, un signal de réglage correspondant pour la commande d'une pompe à cylindrée variable (16).
  8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'unité de commande électrique (15) est reliée électriquement côté entrée à un capteur (26) et génère en fonction d'un signal du capteur (26) un signal de réglage pour la commande de la pompe à cylindrée variable (16) et à l'attention de la soupape de commutation (17, 17', 17") correspondante.
  9. Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce que l'unité de commande électrique (15) est reliée à une manette multifonction (25) se composant d'au moins une touche (30) et d'une poignée de retenue mobile (29), les signaux d'actionnement de la poignée de retenue (29) et de la touche (30) étant traités dans l'unité de commande électrique (15) pour la génération d'un signal de réglage.
EP19980115143 1997-10-02 1998-08-12 Dispositif de commande d'un vérin hydraulique d'une moissonneuse automotrice Expired - Lifetime EP0907031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997143801 DE19743801A1 (de) 1997-10-02 1997-10-02 Vorrichtung zur Steuerung eines Hydraulikzylinders in einer selbstfahrenden Erntemaschine
DE19743801 1997-10-02

Publications (3)

Publication Number Publication Date
EP0907031A2 EP0907031A2 (fr) 1999-04-07
EP0907031A3 EP0907031A3 (fr) 2001-01-10
EP0907031B1 true EP0907031B1 (fr) 2011-01-05

Family

ID=7844534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980115143 Expired - Lifetime EP0907031B1 (fr) 1997-10-02 1998-08-12 Dispositif de commande d'un vérin hydraulique d'une moissonneuse automotrice

Country Status (2)

Country Link
EP (1) EP0907031B1 (fr)
DE (2) DE19743801A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009020046B4 (de) * 2009-05-05 2012-08-16 Kraussmaffei Technologies Gmbh Elektrisch betriebene hydraulische Antriebseinrichtung als Nebenaggregat für eine Spritzgiessmaschine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2902264A1 (de) * 1979-01-22 1980-07-24 Bosch Gmbh Robert Steuereinrichtung fuer eine hydraulikanlage
DE2904293A1 (de) * 1979-02-05 1980-08-07 Claas Ohg Hydraulisches steuerventil
DE3546336A1 (de) * 1985-12-30 1987-07-02 Rexroth Mannesmann Gmbh Steueranordnung fuer mindestens zwei von mindestens einer pumpe gespeiste hydraulische verbraucher
DE69112375T2 (de) * 1990-09-28 1996-03-07 Hitachi Construction Machinery Co., Ltd., Tokio/Tokyo Steuerungssystem für hydraulische pumpe.
DE59105057D1 (de) * 1990-12-15 1995-05-04 Barmag Barmer Maschf Hydrauliksystem.
US5261234A (en) * 1992-01-07 1993-11-16 Caterpillar Inc. Hydraulic control apparatus
US5249421A (en) * 1992-01-13 1993-10-05 Caterpillar Inc. Hydraulic control apparatus with mode selection
JPH05256303A (ja) * 1992-01-15 1993-10-05 Caterpillar Inc 油圧回路制御装置
DE4235380C2 (de) * 1992-06-19 1995-05-11 Weimar Werk Maschinenbau Gmbh Anordnung zur Steuerung von Erntemaschinen
US5383390A (en) * 1993-06-28 1995-01-24 Caterpillar Inc. Multi-variable control of multi-degree of freedom linkages
US5666806A (en) * 1995-07-05 1997-09-16 Caterpillar Inc. Control system for a hydraulic cylinder and method

Also Published As

Publication number Publication date
DE59814480D1 (de) 2011-02-17
EP0907031A3 (fr) 2001-01-10
EP0907031A2 (fr) 1999-04-07
DE19743801A1 (de) 1999-04-08

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