EP2171286B1 - Verfahren und hydraulische steueranordnung zur druckmittelversorgung zumindest eines hydraulischen verbrauchers - Google Patents

Verfahren und hydraulische steueranordnung zur druckmittelversorgung zumindest eines hydraulischen verbrauchers Download PDF

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Publication number
EP2171286B1
EP2171286B1 EP08773546.0A EP08773546A EP2171286B1 EP 2171286 B1 EP2171286 B1 EP 2171286B1 EP 08773546 A EP08773546 A EP 08773546A EP 2171286 B1 EP2171286 B1 EP 2171286B1
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EP
European Patent Office
Prior art keywords
pressure
pump
valve
control arrangement
consumer
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.)
Not-in-force
Application number
EP08773546.0A
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German (de)
English (en)
French (fr)
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EP2171286A1 (de
Inventor
Matthieu Desbois-Renaudin
Wolfgang Kauss
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP2171286A1 publication Critical patent/EP2171286A1/de
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Publication of EP2171286B1 publication Critical patent/EP2171286B1/de
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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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • 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
    • F15B11/003—Systems with load-holding 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • F15B11/0445—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out" with counterbalance valves, e.g. to prevent overrunning or for braking
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3057—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having two valves, one for each port of a double-acting output member
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves
    • F15B2211/5059—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves using double counterbalance 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the invention relates to a method for controlling a hydraulic consumer according to the preamble of claim 1 and a hydraulic control arrangement for supplying pressure medium to the consumer according to the independent claim 7.
  • a hydraulic control arrangement in which a consumer, for example a differential cylinder via a valve device with two continuously adjustable directional valves with pressure medium is supplied, which is provided by a pump.
  • a continuously adjustable directional control valve In the flow to and in the return from the consumer, each a continuously adjustable directional control valve is arranged.
  • the directional control valves are biased in their neutral position into a blocking position and can be adjusted via pressure reducing valves in each case in one direction, in which the pump with the associated pressure chamber and in another direction, in each of which the associated pressure chamber is connected to the tank.
  • this known control arrangement can be operated by a suitable control of the two-way valves, the consumer with a so-called regeneration circuit.
  • the decreasing annular space is connected via the associated directional control valve to the pressure medium inlet to the enlarging pressure chamber, so that the cylinder is extended in rapid traverse.
  • a disadvantage of the regeneration / differential circuit is that due to the clamping of the load (effective effective area corresponds approximately to the piston rod surface) of the consumer can not be operated with the maximum power.
  • the retrievable tomb performance in the regeneration mode is too low due to the clamping of the consumer.
  • the regeneration mode is accordingly preferably used when lowering the equipment of the mobile implement. To operate the consumer with high performance, such as when digging or lifting a load is then switched to the normal function in which the increasing pressure chamber with the pump and the decreasing pressure chamber is connected to the tank.
  • a lowering brake valve can be provided in the return from the consumer, as for example from the DE 196 08 801 C2 or from the data sheet VPSO-SEC-42; 04.52.12-X-99-Z of the company Oil Control, a subsidiary of the applicant is known.
  • the invention has for its object to optimize the switching from regeneration to normal operation in terms of the energy savings associated with the regeneration and the load available at the consumer.
  • a supply-side and a discharge-side pressure chamber of a hydraulic consumer are connected to a pump or a tank via a valve device which can be activated by means of a control unit in order to actuate the consumer.
  • the valve device is moved into a regeneration mode in which the pressure medium flowing from the return-side pressure chamber is summed to the flow rate of the pump, so that it can be adjusted to a lower flow or the consumer extends at a higher speed.
  • the adjustment of the pressure medium requirement by means of an actuator, such as a joystick. According to the adjustment of the pump takes place after a pressure control.
  • the actual pump delivery flow can be determined, for example, from the swivel angle of the pump designed as a variable displacement pump and the pump speed at a given pump pressure.
  • variable displacement pump is preferably designed with an electro-proportional swivel angle control, wherein preferably a control signal of a pressure control loop is then proportional to the swivel angle of the pump.
  • the actual pump pressure can be detected and compared with a predetermined pump pressure via the actuator.
  • the pressure difference is then fed as input to a controller, such as a PI or a PID controller whose output is a measure of the swing angle and forms the input signal of the pump controller.
  • the control of the consumer is further optimized if the regeneration mode is preset in certain directions of movement of the consumer, for example when lowering an excavator equipment as a starting situation. That as soon as the actuator (joystick) is moved in the direction of lowering, the regeneration mode is automatically set. This is maintained until the operator moves the joystick back to the zero position or moves beyond this zero position. The switch to normal operation then runs in the manner described above.
  • the switching between the regeneration mode and the normal operation is preferably carried out via a ramp, wherein the pressure medium connection between the variable displacement pump and the increasing pressure chamber remains open and the pressure medium connection of the decreasing pressure chamber is opened in accordance with the course of the ramp.
  • variable displacement pump with a suitable design, also allows power control.
  • the device complexity of the control arrangement can be reduced if a continuously adjustable directional control valve with two switching positions and a lowering brake valve are arranged in the flow and in the return of each consumer, so that flow and return are independently controlled.
  • the electrically or electro-hydraulically adjustable directional control valves are preferably open in their neutral position towards the tank.
  • the reliability of the control arrangement is improved when the lowering brake valves are designed with a secondary pressure limiting function.
  • FIG. 1 shows a hydraulic control arrangement 1 for pressure medium supply to two consumers 2, 4 of a mobile implement, such as an excavator, a backhoe loader, a mini and compact excavator or a telehandler.
  • a mobile implement such as an excavator, a backhoe loader, a mini and compact excavator or a telehandler.
  • EFM system electronic flow management
  • the input of the setpoints is carried out via a joystick 8, which is actuated by the operator to control the equipment (for example, boom, bucket) of the implement in terms of speed and position.
  • the two consumers 2, 4 are each designed as a differential cylinder with a bottom-side pressure chamber 10 and 12 and a piston rod side annular space 14 and 16 respectively.
  • These pressure chambers 10, 14; 12, 16 can each be connected via a directional control valve section 18, 20 with a variable displacement pump 22 or a tank 24 to the cylinder on or extend.
  • the variable displacement pump 22 is pressure-controlled via a pump regulator 26, via which, after reaching the predetermined pressure, the delivery flow of the pump is adjusted so that the pressure in the system remains constant independently of the delivery flow. With a pressure medium volume flow change virtually no pressure change should be connected.
  • the pump controller 25 allows via an electro-proportional swivel angle control directly controlled via a pivoting cradle of the variable displacement continuous and reproducible adjustment of the displacement of the pump.
  • Such pump regulators are known, for example, from the data sheet RE 92 708 - see here in particular the variants EP and EK, so that only the features of the pump controller 25 required for understanding the invention are explained here.
  • Such a pump regulator 25 has a pump control valve 26, which is designed with three connections and which is biased via a control spring 27 in the direction of a neutral position in which the three connections of the pump control valve 26 are shut off.
  • the control spring 27 is supported on the actuating piston 28 of an actuating cylinder 29, over which the pivoting cradle of the variable displacement pump 22 is pivotable.
  • the adjusting piston 28 is biased by a spring in a basic position in which the pivot angle of the variable displacement pump 22 is maximum.
  • the actuation of the valve spool of the pump control valve 26 via a proportional solenoid 30 which is energized via a connected to the control unit 6 signal line 51.
  • the channel 32 is connected via a nozzle 33 with a connecting channel 34, in which two pressure-limiting valves 35, 36 connected in series are arranged.
  • the output of in FIG. 2 downstream pressure relief valve 36 is connected via a tank control channel 37 to the tank 24.
  • the two pressure limiting valves 35, 36 are biased in the direction of their illustrated basic position in which the pressure medium connection to the tank control channel 37 is opened.
  • the two pressure relief valves 35, 36 are set to different pressures. Upon reaching the respective pressure, the relevant pressure relief valve 35, 36 adjusted from its illustrated home position, so that a Control oil flow path from the pump line 38 via the control line 31, the pressure limiting line 39, the relevant pressure relief valve 35, 36, the connecting channel 34 and the branch line 40 is opened to the spring chamber of the control spring, so that in this spring chamber as the pump pressure is effective. Accordingly, then the actuator piston 28 against the force of the return spring in the illustration according to FIG. 2 moved to the left and the swing angle is reset to zero, so that the delivery volume is correspondingly minimal or equal to zero.
  • the two pressure relief valves 35, 36 are biased in their basic position shown.
  • a predetermined stand-by pressure of, for example, 20 bar is required, only then can the force of the return spring be overcome.
  • the pivot angle of the variable displacement pump 22 is set to its maximum value.
  • the control piston of the pump control valve 26 in the illustration in accordance FIG. 2 shifted to the left, so that the control line 31 is connected to the channel 32 and a pressure corresponding to the pump pressure in the spring chamber of the control spring 27 is effective.
  • the return piston 28 is then adjusted against the force of its return spring in the direction of minimizing the pivot angle, so that the pump delivery flow goes to zero.
  • the pump control valve 26 Upon further adjustment of the pump control valve 26 to the left, the pressure medium connection between the control line 31 and the channel 32 is controlled and the spring chamber of the control spring 27 via the branch line 40 to the connecting channel 34 and thus connected to the tank control channel 37, so that the control oil from the spring chamber to Can flow out tank 24 and is adjusted according to the actuating piston 28 by the force of the return spring in the direction of increasing the pivot angle. Accordingly, the pump delivery flow increases proportional to the current at the proportional solenoid 30. In the event of a cable break or a loss of control signal, the variable-displacement pump 22 shown returns to its basic position, in which the maximum pivoting angle is set.
  • the pressure in the pump line 38 is detected by a pressure sensor 48 and reported via a signal line 46 to the control unit 6.
  • This corresponding to the actual pump pressure Pressure signal is compared with the target pressure set by means of the joystick 8 and the output signal is applied to an electronic PI or PID controller 47. Its output signal is then taken into account via the control unit 6 by software in the control of the directional control valve sections 18, 20.
  • the output signal is further applied via a signal amplifier 49 and a signal line 51 to the proportional solenoid 30 to adjust the control piston of the pump control valve 26, wherein in the control position of the control piston equilibrium between the force applied by the proportional magnet 30 and the force over the control spring 27th and adjusts the actuator piston 28 in the opposite direction applied force to the control piston.
  • the suction connection of the variable displacement pump 22 is connected to the tank 24 via a suction line 50 and a filter.
  • the pressure medium conveyed by the variable displacement pump 22 flows via the pump line 38 and the two directional control valve sections 18, 20, the structure of which is described below FIG. 2 is explained to the consumers 2, 4.
  • the pressure medium flows from the back of the consumers 2, 4 via the associated directional control valve sections 18, 20 and a tank line 52 to the tank 24, wherein in the end portion of the tank line 52, a further filter is provided over a pressure relief valve is bypassed and that opens when the filter clogging and thus the increase in pressure drop across the filter.
  • the temperature of the pressure medium received in the tank 24 is detected by a temperature sensor 54 and reported to the control unit 6 via a signal line.
  • a purge valve 57 is provided between the tank line 52 and the pump line 38. This purge valve 57 also has a pressure limiting function, so that the pressure in the pump line 38 can be limited to a maximum pressure.
  • the control of the flushing valve 57 is also carried out electrically in response to a signal of the control unit 6.
  • FIG. 3 shows the basic structure of the two-way valve sections 18, 20, wherein for example the directional control valve segment 18 is shown and the variable displacement pump 22 and the tank 24 are shown in simplified form.
  • the directional valve section 18 has two pressure ports P, which are each connected via a feed line 56, 58 to the pump line 38.
  • Two tank connections T of the directional valve section 18 are connected to the tank line 52 via discharge lines 60, 62.
  • Each connection pair P, T of the directional control valve section 18 is associated with a working port A and B, which is connected via a flow line 64 and a return line 66 to the pressure chamber 10 and the annular space 14 of the consumer 2.
  • a continuously adjustable 3-way valve 68, 70 with two switching positions and three terminals and a lowering brake valve 72 and 74 are respectively arranged.
  • Each directional control valve 68,70 is biased via a control spring in its neutral position shown, in which the drain line 60, 62 is in fluid communication with a connecting channel 76, 78, which extends in each case to the adjacent lowering brake valve 72, 74.
  • the two-way valves 68, 70 with their open to the tank 24 neutral position an extremely simple structure, wherein the adjustment - in contrast to the prior art described above - only a pilot valve and a proportional solenoid 80, 82 is required, while in the known Solutions with closed center position each two expensive proportional magnets must be used.
  • the directional control valves 68, 70 can also be controlled directly via proportional solenoids.
  • the two Senkbremsventile 72, 74 have a known structure, such as, for example, from the aforementioned DE 196 08 801 C2 or the publication of the company Oil Control is known.
  • Such lowering brake valves allow the controlled lowering of a load and simultaneously act as a secondary pressure relief valve.
  • the lowering brake valves are biased by an adjustable biasing spring 84, 86 in a locking position.
  • the spring chambers of the two bias springs 84, 86 are vented to the atmosphere. In the opening direction of the respective pressure acts on the associated working port A, B, which is tapped in each case via a pressure limiting control line 88, 90.
  • connection channel 76, 78 acts, which is tapped, as it were, "crosswise" by means of control lines 92, 94.
  • control lines 92, 94 may also be the consumer 2 attacking load are supported leak-free.
  • the pressure medium supply from the directional control valve 68, 70 to the respective pressure chamber of the consumer 2 is in each case via a bypass channel 96, 98 which connects the connecting channel 76, 78 with the respective flow line 64, 66, wherein in each bypass channel 96, 98 in the direction of the consumer 2 opening check valve 100, 102 is arranged.
  • the two pressure chambers of each consumer 2, 4 are connected to the tank 24.
  • the load F acting on the load 2 is supported leak-free by the lowering brake valve 72, 74 designed as a seat valve.
  • the load F can be designed as a pulling or pushing load.
  • About the pressure limiting function of the two lowering brake valves 72, 74 ensures that a maximum pressure in the lines 64, 66 can not be exceeded.
  • the pressure medium is pumped by the pump 22 via the pressure port P, the directional control valve 68, the connecting line 76, the bypass channel 96, the check valve 100 and the supply line 64 in the increasing bottom pressure chamber 10.
  • the pressure medium displaced from the annular space 14 flows via the return line 66 and the counterbalancing valve 74, which is completely opened by the pressure in the connecting channel 76 in the pressure limiting function, the connecting channel 78 and the directional control valve 70 to the inlet line 56 and from there into the pump line 38, so that the pressure from the Consumables running pressure fluid flow is summed to the funded by the pump 22 pressure fluid flow.
  • a pressure should be set in the bottom pressure chamber 10 , which is the difference of the pressure in the annular space 14 minus the load divided by the area ratio of the differential cylinder (for example 2), so that at 250 bar in the annular space 14 and a load of 50 bar, a pressure of about 100 bar results in the pressure chamber 10 ,
  • the directional control valve section 18 When the cylinder and pulling or pushing load, the directional control valve section 18 is in the in FIG. 6 shown switched position in which the directional control valve 68 controls the pressure medium connection to the tank 24 and via the directional control valve 70 pressure medium from the pump 22 is conveyed into the annular space 14. The pressure in the inlet to the annular space 14 then depends on the load, the opening cross section of the directional control valve 70 and the set pump pressure.
  • the pressure medium is conveyed via the bypass channel 98 and the opening check valve 102 and the return line 66 into the annular space 14 and flows from the decreasing pressure chamber 10 via the feed line 64 and the pressure in the inlet (connecting channel 78) open lowering brake valve 72 and the in the direction of its neutral position adjusted directional valve 68 and the drain line 62 to the tank 24 from.
  • the pressure level in the process is limited by the lowering brake valve 72.
  • the pressure level in the inlet is between the maximum pump pressure and 0 bar (pushing load, minimum retraction speed).
  • the regeneration mode is activated as the default for a specific direction of movement of the consumers 2, 4. This may for example be the case when the equipment of an excavator, such as the boom is lowered with a shovel.
  • the pump pressure of the variable displacement pump 22 increases accordingly and limited by the pump controller to a maximum value. Upon reaching this maximum value is - as described above - the swivel angle and thus also the control signal for the swivel angle of the variable 22, so that the pressure fluid flow provided by this no longer corresponds to the pre-set via the joystick 8 pressure medium requirement.
  • variable displacement pump 22 may be designed with a swivel angle sensor.
  • FIG. 7 is a simplified embodiment of the control arrangement 1 according to FIG. 2 shown.
  • the only difference from the above-described embodiment according to FIG. 2 is that in the designated there with return line 66, connected to the consumer 2 line no Senkbremsventil and associated with this directional control valve with two so-called “switching positions" but a single continuously variable directional control valve 104 is biased via a Zentrierfederan onion 105 in a basic position (0) and by operating two pilot valves 108, 83 in the direction of FIG. 7 shown positions (a) and (b) is adjustable.
  • the two pilot valves 83, 108 are - as in the above-described embodiment - designed as pressure reducing valves, which are each controlled by a proportional solenoid 82, 106.
  • the structure of the formed in the flow line 64 valves, with the lowering brake valve 72, the check valve 100 and the biased in an open position directional control valve 68 which is adjustable only in one direction via a single pilot valve 81 and the pressure medium supply correspond to the above-described embodiment, so that respect Explanations are dispensable.
  • the corresponding hydraulic components are provided with the same reference numerals as in the embodiment described above and referred to the relevant description.
  • the pressure medium connection between the drain line 60, the supply line 56 and the return line 66 is shut off.
  • a control pressure can be adjusted via the pressure reducing valve 108, so that the valve spool of the directional control valve 104 is adjusted to the right in the direction of (a) marked positions in which the connection between the return line 66 and the drain line 60 is turned on , The pressure medium connection to the supply line 56 remains blocked.
  • the valve slide of the directional valve 104 is adjusted in the direction (b), so that the pressure medium connection between the supply line 56 and the return line 66 acting as a supply line is correspondingly opened, and the pressure medium connection between the return line 66 and the discharge line 60 is controlled.
  • the directional control valve 104 can also be integrated into the supply line 64, so that then the lowering brake valve 74 and the directional control valve 70 from FIG. 3 are arranged in the return line 66.
  • the directional control valve 104 For retracting the hydraulic cylinder (consumer 2), the directional control valve 104 is adjusted in the direction of its position (b), so that pressure medium of variable displacement pump 22 via the pump line 38, the supply line 56, the directional control valve 104 and then acting as a supply line return line 66 for Annular space 14 of the consumer is promoted. About the directional control valve 104 is then set according to the pressure medium flow rate and the effective pressure in the annular space 14. Due to the pressure in the return line 66, the lowering brake valve 72 is adjusted to its open position, so that, for example cavitations are prevented at a pressing load, since then the consumer 2 remains clamped. In the case of a pulling load, the lowering brake valve 72 is completely or almost completely opened by the preselected pressure via the control line 92, so that the pressure medium can flow to the tank 24 via the lowering brake valve 72 and the corresponding directional control valve 68.
  • the control arrangement can also be operated again in the regeneration mode, in which case the directional control valve 68 is switched over the pilot valve 81 and the directional valve 104 is adjusted via the pilot valve 83 in the direction of its position (b), so that Pressure fluid from the annular space 14 via the directional control valve 104 in the supply line 58 and from there via the directional control valve 68 and the check valve 100, the bypass channel 96 and the flow line 64 to the pressure chamber 10 flows, so that the consumer 2 is extended at great speed.
  • the directional control valve 104 is adjusted in the direction of its positions (a), so that the pressure medium flows from the annular space 14 to the tank 24.
  • a hydraulic control arrangement and a method for controlling a hydraulic consumer which has a flow-side and a return-side pressure chamber, which can be connected via a valve device with a pump or a tank.
  • the control of the valve device by means of a control unit, via which the valve device is adjustable in a regeneration mode, in which both pressure chambers are connected to the pump.
  • the pump is pressure-controlled, wherein in the regeneration mode automatically switching to normal operation, in which the inlet-side pressure chamber with the pump and the return-side pressure chamber is connected to the tank, then takes place when the pump flow drops below the pressure medium requirement.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
EP08773546.0A 2007-06-26 2008-06-20 Verfahren und hydraulische steueranordnung zur druckmittelversorgung zumindest eines hydraulischen verbrauchers Not-in-force EP2171286B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007029358A DE102007029358A1 (de) 2007-06-26 2007-06-26 Verfahren und hydraulische Steueranordnung zur Druckmittelversorgung zumindest eines hydraulischen Verbrauchers
PCT/EP2008/004990 WO2009000472A1 (de) 2007-06-26 2008-06-20 Verfahren und hydraulische steueranordnung zur druckmittelversorgung zumindest eines hydraulischen verbrauchers

Publications (2)

Publication Number Publication Date
EP2171286A1 EP2171286A1 (de) 2010-04-07
EP2171286B1 true EP2171286B1 (de) 2013-11-06

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EP08773546.0A Not-in-force EP2171286B1 (de) 2007-06-26 2008-06-20 Verfahren und hydraulische steueranordnung zur druckmittelversorgung zumindest eines hydraulischen verbrauchers

Country Status (6)

Country Link
US (1) US8499552B2 (da)
EP (1) EP2171286B1 (da)
JP (1) JP5216085B2 (da)
DE (1) DE102007029358A1 (da)
DK (1) DK2171286T3 (da)
WO (1) WO2009000472A1 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010052528B4 (de) 2010-11-25 2021-09-02 Linde Hydraulics Gmbh & Co. Kg Load-Sensing geregeltes hydrostatisches Antriebssystem

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DK2171286T3 (da) 2014-01-27
JP2010531420A (ja) 2010-09-24
JP5216085B2 (ja) 2013-06-19
US20100186401A1 (en) 2010-07-29
WO2009000472A1 (de) 2008-12-31
EP2171286A1 (de) 2010-04-07
US8499552B2 (en) 2013-08-06

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