EP3827173A1 - Hydrauliksystem und verfahren zum steuern eines hydrauliksystems - Google Patents

Hydrauliksystem und verfahren zum steuern eines hydrauliksystems

Info

Publication number
EP3827173A1
EP3827173A1 EP19752429.1A EP19752429A EP3827173A1 EP 3827173 A1 EP3827173 A1 EP 3827173A1 EP 19752429 A EP19752429 A EP 19752429A EP 3827173 A1 EP3827173 A1 EP 3827173A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
consumers
load
pump
assignment unit
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.)
Pending
Application number
EP19752429.1A
Other languages
German (de)
English (en)
French (fr)
Inventor
Christian Ziemens
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.)
Putzmeister Engineering GmbH
Original Assignee
Putzmeister Engineering 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 Putzmeister Engineering GmbH filed Critical Putzmeister Engineering GmbH
Publication of EP3827173A1 publication Critical patent/EP3827173A1/de
Pending legal-status Critical Current

Links

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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • 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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • 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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
    • 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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F15B2211/20584—Combinations of pumps with high and low 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F15B2211/20592—Combinations of pumps for supplying high and low 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25—Pressure control functions
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/255—Flow control functions
    • 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
    • F15B2211/265—Control of multiple pressure sources
    • F15B2211/2656—Control of multiple pressure sources by control of the pumps
    • 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
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • 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
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple output members
    • 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
    • F15B2211/31547—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and multiple output members
    • 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31594—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and multiple output members
    • 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
    • F15B2211/605—Load sensing 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • 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
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6057—Load sensing circuits having valve means between output member and the load sensing circuit using directional 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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

Definitions

  • the invention relates to a hydraulic system with a plurality of hydraulic consumers and with a plurality of load-sensing valves for adjusting the pumping power of the hydraulic pump.
  • the invention also relates to a method for controlling a hydraulic system.
  • the delivery pressure of the hydraulic pump is set under the control of the load-sensing valves to a value which is greater than the highest current load pressure, which is demanded by one of the hydraulic consumers.
  • the hydraulic pressure is reduced by pressure compensators.
  • an assignment unit is arranged between the hydraulic pump and the hydraulic consumers, which defines a first hydraulic path between the hydraulic pump and the hydraulic consumers in a first switching state and which defines a second hydraulic path between the hydraulic pump and the hydraulic consumers in a second switching state.
  • the system includes a controller that processes a status value of a hydraulic consumer as an input variable and that determines a control signal for the switching status of the assignment unit.
  • the invention has recognized that it is possible to adapt the hydraulic paths between the hydraulic pump and the hydraulic consumers in a targeted manner to the requirements, by controlling the control unit as a function of the current state of the hydraulic consumers.
  • a state value of a hydraulic consumer is a quantity that represents the current operating state of the hydraulic consumer.
  • the status value can relate to the current load pressure of the hydraulic consumer.
  • the controller can determine a control signal for the switching status of the assignment unit.
  • the control signal can be transmitted to the assignment unit.
  • the assignment unit can be set to a switching state corresponding to the control signal.
  • a hydraulic path denotes a path through which a hydraulic consumer is supplied by a hydraulic pump.
  • a hydraulic path in the sense of the invention generally extends from a hydraulic pump via a load-sensing valve to a hydraulic consumer.
  • a load-sensing valve has the function of the pump output of the hydraulic pump depending on the current operating state of the hydraulic consumers.
  • the load-sensing valve can be designed to set the delivery pressure of the hydraulic pump to a value which is higher by a predetermined pressure difference than the highest load pressure of a consumer supplied by the hydraulic pump.
  • the load-sensing valves can be designed as proportional valves. It is also possible for the plurality of load-sensing valves to comprise one or more proportional valves and / or one or more constant flow valves (flow control valves).
  • the assignment unit is arranged between a plurality of load-sensing valves and a plurality of hydraulic consumers.
  • the switching states of the assignment unit can be defined such that in the first switching state a first hydraulic consumer is supplied by a first load-sensing valve and that in the second switching state a second hydraulic consumer is supplied by the first load-sensing valve. This can apply to any combination of load-sensing valves and hydraulic consumers.
  • the assignment unit can be designed in such a way that in the first switching state a first group of hydraulic consumers is supplied by a first load-sensing valve and in the second state a second group of hydraulic consumers are supplied by the first load-sensing valve ,
  • the assignment unit and / or the controller can be designed in such a way that any group of hydraulic consumers can be assigned to each load-sensing valve. It is also possible that certain assignments are allowed, while other assignments are excluded from the outset.
  • the allocation unit is set up in such a way that a load-sensing valve in each switching state supplies exactly one hydraulic consumer. So there is a first switching state of the assignment unit, in which a load-sensing valve supplies exactly one first hydraulic consumer, and a second switching state, in which the load-sensing valve supplies exactly one second hydraulic consumer.
  • the switching states of the assignment unit can be defined such that each hydraulic consumer is supplied by exactly one load-sensing valve. It is also possible for one or more hydraulic consumers to be supplied by a load-sensing valve in a first switching state and to be supplied by more than one load-sensing valve in a second switching state.
  • the connection of several load-sensing valves to a hydraulic consumer can be useful if a hydraulic sensor was previously assigned to a load-sensing valve that provides a sufficient volume flow for common operating conditions of the hydraulic consumer.
  • the actuation speed of the hydraulic consumer can be temporarily increased by connecting a second load-sensing valve to the hydraulic consumer. In other words, the volume flow supplied to a hydraulic consumer can be increased while the valve size remains the same and / or the individual load-sensing valve can be reduced, the volume flow being temporarily increased by connecting a second load-sensing valve.
  • the normal actuation speed can be defined by the fact that the mast tip should not exceed a certain speed when the mast is stretched.
  • a second load-sensing valve By connecting a second load-sensing valve to the hydraulic consumer, a higher actuation speed can be made possible when the mast is folded in.
  • the hydraulic system according to the invention can comprise more than one hydraulic pump. Each hydraulic pump can be assigned exactly one load-sensing valve.
  • the invention opens up the possibility that a particular hydraulic consumer is temporarily supplied by a first hydraulic pump and temporarily by a second hydraulic pump.
  • the assignment unit according to the invention can be used to switch between the hydraulic paths in a suitable manner.
  • the assignment unit can be designed in such a way that the hydraulic consumers are assigned to the hydraulic pumps in groups, the composition of the groups being able to vary depending on the switching state of the assignment unit.
  • an assignment unit in the sense of the invention is arranged between a plurality of hydraulic pumps and a plurality of load-sensing valves.
  • the allocation unit can be provided in addition or alternatively to the allocation unit between the plurality of load-sensing valves and the plurality of hydraulic consumers.
  • the various possibilities of hydraulic paths in the assignment unit correspond to the options mentioned above.
  • the hydraulic system comprises only one allocation unit between the load-sensing valves and the hydraulic consumers, but no allocation unit between the hydraulic pumps and the load-sensing valves, there is the possibility of temporarily connecting more than one hydraulic pump to a hydraulic consumer.
  • a corresponding effect can also be achieved if an assignment unit is only arranged between the hydraulic pumps and the load-sensing valves, but not between the load-sensing valves and the hydraulic consumers.
  • the hydraulic system comprises a first assignment unit, which is arranged between the load-sensing valves and the consumers, and a second assignment unit, which is arranged between the pumps and the load-sensing valves, the hydraulic paths between the hydraulic pump can and be designed to be particularly flexible for consumers.
  • the control of the hydraulic system can be set up such that it forms a first group of hydraulic consumers and a second group of hydraulic consumers based on the state values of the hydraulic consumers.
  • a group in the sense of the invention can consist of individual hydraulic consumers.
  • the groups can be defined, for example, in that the current load pressure is below a threshold value for all hydraulic consumers in the first group, while the current load pressure is above the threshold value for all hydraulic consumers in the second group. If the hydraulic consumers are sorted according to load level and assigned to the hydraulic pumps, the compensation losses can be kept low.
  • the composition of the groups can be dynamically adjusted depending on the current operating status of the hydraulic consumers. For this purpose, the control can continuously check the operating state of the hydraulic consumers and, if necessary, generate a control signal by means of which the switching state of the assignment unit is changed.
  • the controller can be designed to determine the threshold value as a function of the operating state of the hydraulic consumers. For example, the load pressures of the hydraulic consumers can be viewed in ascending order and the threshold value can be placed between those neighboring load pressures that have the greatest distance from one another. If there is a subdivision into more than two groups, the threshold values can be placed in the next smallest distances.
  • control system can be designed to determine on the basis of a suitable criterion whether load pressure vibrations occur in a hydraulic consumer. Fluctuations in the load pressure can indicate that a mechanical vibration has occurred in an element connected to the consumer. If an oscillation characteristic value is greater than a predetermined threshold value, the control can generate a control specification according to which the hydraulic consumer in question is separated from other hydraulic consumers. In other words, if the allocation unit had previously a switching state in which the hydraulic consumer in question was supplied together with other consumers, the allocation unit can be brought into a different switching state in which the hydraulic consumer in question is supplied by one of its hydraulic pumps than the others Hydraulic consumer of the previous group. In this way it can be prevented that the vibrations are transmitted from one hydraulic consumer to other hydraulic consumers.
  • the controller can take into account inputs by an operator as a further input variable. If the operating state of the hydraulic consumer changes according to an input by the operator, this can have the consequence that the previous switching state of the assignment unit is no longer optimal.
  • the controller can process the operator's input in order to determine a new control specification for the assignment unit. In a corresponding manner, the control can process information about the global operating state of the hydraulic system as an input variable.
  • the controller can also make control specifications for the state of the load sensing valves. In particular, the opening cross section of the load-sensing valves can be adjusted under the control of the control. The feedback between the load states of the hydraulic consumers and the
  • Pumping capacity of the hydraulic pump can take place hydraulically. It is also possible that the load pressures are recorded electronically and that the hydraulic pumps can be adjusted electrically. In this case, the pumps can be controlled via the controller.
  • the consumers of the hydraulic system can be, for example, linear drives or rotary drives.
  • the hydraulic system can be designed to drive elements of a concrete pump.
  • the consumers of the hydraulic system can include, for example, a linear drive for folding a mast arm of a concrete pump and / or a rotary drive for driving a rotary movement of the mast arm.
  • the invention also relates to a concrete pump with a plurality of hydraulic consumers, in which the hydraulic consumers are elements of such a hydraulic system.
  • the invention also relates to a method for controlling egg NES hydraulic system, in which a plurality of Hydraulikver consumers is supplied with a hydraulic pump and in which the pumping power of the hydraulic pump is adjusted with a plurality of load-sensing valves.
  • An assignment unit is arranged between the hydraulic pump and the hydraulic consumers, with which it is possible to switch between different hydraulic paths from the hydraulic pump to the hydraulic consumers.
  • a controller processes a state value of a hydraulic consumer as an input variable in order to determine a control signal for the switching state of the assignment unit.
  • the method can be further developed with further features that are described in connection with the hydraulic system according to the invention.
  • the hydraulic system can be further developed with further features that are described in connection with the method according to the invention.
  • FIG. 2 the concrete pump according to FIG. 2 in a different state
  • Fig. 3 shows a comparative example according to the prior art
  • Fig. 4 is a schematic representation of an inventive
  • a truck 14 shown in FIG. 1 is equipped with a concrete pump 15 which conveys liquid concrete from a prefilling container 16 through a delivery line 17.
  • the delivery line 17 it extends along a mast arm 18 which is rotatably mounted on a slewing ring 19.
  • the mast arm 18 comprises three mast arm segments 20, 21, 22 which are connected to one another in an articulated manner. By pivoting the mast arm segments 20, 21, 22 relative to one another via the joints, the mast arm 18 can change between a folded-in state (FIG. 1) and an unfolded state (FIG. 2).
  • the delivery line 17 extends beyond the outer end of the third mast arm segment 22, so that the liquid concrete can be applied in an area distant from the concrete pump 15.
  • the mobile concrete pump according to FIGS. 1 and 2 comprises a hydraulic system with at least one hydraulic pump and a plurality of hydraulic consumers. To the hydraulic consumption Rather, a first linear drive 23, a second linear drive 24, a third linear drive 25 and a rotary drive 26. With the linear drives 23, 24, 25, the mast arm segments 20, 21, 22 can be pivoted relative to one another around the mast arm fold in or fold out. With the rotary drive 26, the mast arm 18 can be rotated relative to the chassis of the truck 14 via the slewing ring 19.
  • the hydraulic consumers 23, 24, 25, 26 are actuated by inputs from an operator. If the folding state of the mast arm 18 is to be changed, the corresponding input by the operator is converted into an actuation of the linear drives 23, 24, 25. The same applies to a rotation of the mast arm 18 relative to the chassis.
  • the delivery pressure of the hydraulic pump is set by load-sensing valves so that it is slightly higher than the highest load pressure that one of the hydraulic consumers 23, 24, 25, 26 demands at the moment.
  • the pressure is reduced by pressure compensators.
  • the pressure reduction results in power losses in the form of compensation losses, which according to FIG. 3 are particularly pronounced when individual hydraulic consumers are currently demanding a high load pressure at a low volume flow, while the volume flow is high at another hydraulic consumer at a low load pressure.
  • Fig. 3 for the three hydraulic consumers 23, 24, 25, the load pressure P against the volume flow Q is plotted for a certain point in time.
  • the load pressure P is high and the volume flow Q is low.
  • the load pressure P is low and the volume flow Q is high.
  • An inevitable loss of performance in the hydraulic system results from the delivery pressure 29 of the hydraulic pump is slightly higher than the highest load pressure 27, which is required in this case by the hydraulic consumer 23.
  • the compensation loss 28, which results from the throttling from the load pressure 27 to the load pressure of the hydraulic consumer 25, is significantly greater. In the hydraulic system according to the invention, the compensation losses can be kept lower.
  • the hydraulic system comprises a first hydraulic pump 31 and a second hydraulic pump 32. Both hydraulic pumps 31,
  • the hydraulic consumers of the system include the three linear drives 23, 24, 25. Between the hydraulic pumps 31, 32 and the hydraulic consumers 23, 24, 25, load-sensing valves 33, 34, 35 are arranged, with which the delivery pressure of the hydraulic pumps 31 , 32 is adapted to the current load pressure of the linear drives 23, 24, 25.
  • the feedback required for this to the controller of the hydraulic pumps 31, 32 can take place hydraulically or electronically.
  • a first allocation unit 36 is arranged between the load-sensing valves 33, 34, 35 and the hydraulic consumers 23, 24, 25.
  • the assignment unit 36 comprises different switching states with which different hydraulic paths between the load-sensing valves 33, 34, 35 and the hydraulic consumers 23, 24, 25 can be made available.
  • the switching states are defined such that each of the hydraulic consumers 23, 24, 25 can be connected individually or in any group to one of the load-sensing valves 33, 34, 35.
  • a second assignment unit 37 is arranged with the correspondingly the hydraulic pumps 31, 32 and the load-sensing valves 33,
  • the hydraulic system comprises a controller 38, which is coupled to an operating unit 39 of the hydraulic system and a superordinate information system 44. Via signal lines 40, the controller 38 receives information about the momentary load pressures of the hydraulic consumers 23, 24, 25 as an input variable. Control signals can be sent to the first assignment unit 36, the load-sensing valves 33, 34, 35 and the second assignment unit 37 via control lines 41, 42, 43.
  • control 38 receives the information via the signal lines 40 that, according to the state shown in FIG. 3, the load pressure at the first and second hydraulic consumers 23, 24 is high, while the load pressure at the third hydraulic consumer 25 is low, then the Control 38 separate a group from the first two hydraulic consumers 23, 24 and separate the third hydraulic consumer 25 from the group.
  • This can be converted by the controller 38 into control signals, which are passed via the control lines 41, 43 to the first assignment unit 36 and the second assignment unit 37.
  • the assignment units 36, 37 are switched by the control signals such that the first two hydraulic consumers 23, 24 are supplied by the first hydraulic pump 31 and that the third hydraulic consumer 25 is supplied by the second hydraulic pump 32.
  • the controller 38 can evaluate the load pressure data received via the signal lines 40 for vibrations. If, for example, a state occurs in the first hydraulic consumer 23 in which the oscillation of the load pressure is greater than a predefined threshold value, then The controller 38 can form a group of the second and third hydraulic consumers 24, 25 and separate the first hydraulic consumer 23 from the group. Via the control lines 41, 43, the assignment units 36, 37 can be activated such that the first hydraulic consumer 23 is connected to the first hydraulic pump 31 and the second and third hydraulic consumers 24, 25 are connected to the second hydraulic pump 32. The separation of the first hydraulic consumer 23 ensures that the vibrations occurring in this hydraulic consumer 23 have no disadvantageous effects on the other hydraulic consumers 24, 25.
  • Another control approach of the controller 38 is to determine a state in which two of the hydraulic consumers 23, 24, 25 are at a standstill or require little power, while a rapid movement is required by a third hydraulic consumer. 1 and 2, it is evident that, with the mast arm 18 almost completely unfolded, even a slow movement of the linear drives 23, 24, 25 can cause the mast tip to move quickly.
  • the load-sensing valves 33, 34, 35 can be dimensioned such that the maximum volume flow through one of the valves permits the slow movements of the linear drive 23, 24, 25 required in the stretched state.
  • a faster movement of the linear drives 23, 24, 25 may be desired when the mast arm 18 is almost folded.
  • the controller 38 detects a state in which, for example, the first two linear drives 23, 24 are at a standstill, while rapid movement is required by the third linear drive 25, it can send control signals to the assignment units 36, 37 according to which a further load-sensing valve is connected to the third linear drive 25 becomes. This enables a higher actuation speed for the third linear drive 25.
  • a plurality of control approaches can be implemented in parallel in the controller 38.
  • a ranking between the control approaches can be defined. For example, avoiding vibrations can be given the highest priority. If all hydraulic consumers of the system are free of vibrations, the hydraulic consumers can be sorted into groups based on the current load pressures in order to keep the compensation losses low. In the third priority, several hydraulic pumps can be switched on to a hydraulic consumer in order to increase the actuation speed.

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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)
EP19752429.1A 2018-07-25 2019-07-25 Hydrauliksystem und verfahren zum steuern eines hydrauliksystems Pending EP3827173A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018117949.9A DE102018117949A1 (de) 2018-07-25 2018-07-25 Hydrauliksystem und Verfahren zum Steuern eines Hydrauliksystems
PCT/EP2019/070012 WO2020020997A1 (de) 2018-07-25 2019-07-25 Hydrauliksystem und verfahren zum steuern eines hydrauliksystems

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EP3827173A1 true EP3827173A1 (de) 2021-06-02

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US (1) US11434936B2 (zh)
EP (1) EP3827173A1 (zh)
JP (1) JP7234486B2 (zh)
KR (1) KR20210036361A (zh)
CN (1) CN112513473B (zh)
DE (1) DE102018117949A1 (zh)
WO (1) WO2020020997A1 (zh)

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DE102018206271A1 (de) * 2018-04-24 2019-10-24 Putzmeister Engineering Gmbh Verfahren zur Bewegungssteuerung eines Masts und Arbeitsmaschine

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US3987623A (en) * 1976-01-23 1976-10-26 Caterpillar Tractor Co. Controlled priority fluid system of a crawler type vehicle
US4369625A (en) * 1979-06-27 1983-01-25 Hitachi Construction Machinery Co., Ltd. Drive system for construction machinery and method of controlling hydraulic circuit means thereof
GB8822901D0 (en) * 1988-09-29 1988-11-02 Mactaggart Scot Holdings Ltd Apparatus & method for controlling actuation of multi-piston pump &c
US5456581A (en) * 1994-08-12 1995-10-10 The United States Of America As Represented By The Secretary Of The Navy Control system for a multi-piston pump with solenoid valves for the production of constant outlet pressure flow
JPH08200309A (ja) * 1995-01-30 1996-08-06 Caterpillar Inc 流体力補償装置
DE19603899A1 (de) 1996-02-03 1997-08-07 Rexroth Mannesmann Gmbh Hydraulische Steuervorrichtung zur Druckmittelversorgung mehrerer hydraulischer Verbraucher
GB0614534D0 (en) * 2006-07-21 2006-08-30 Artemis Intelligent Power Ltd Fluid power distribution and control system
US7487707B2 (en) 2006-09-27 2009-02-10 Husco International, Inc. Hydraulic valve assembly with a pressure compensated directional spool valve and a regeneration shunt valve
DE102008008102A1 (de) * 2008-02-08 2009-08-13 Robert Bosch Gmbh Verfahren und Vorrichtung zur Druckmittelversorgung von zumindest drei hydraulischen Verbrauchern
DE102009050007A1 (de) * 2009-10-21 2011-05-05 Alpha Fluid Hydrauliksysteme Müller GmbH Hydraulische Parallelweiche
JP6021226B2 (ja) * 2013-11-28 2016-11-09 日立建機株式会社 建設機械の油圧駆動装置
JP6005088B2 (ja) * 2014-03-17 2016-10-12 日立建機株式会社 建設機械の油圧駆動装置
JP6934454B2 (ja) * 2018-06-25 2021-09-15 日立建機株式会社 建設機械
JP6975102B2 (ja) * 2018-06-26 2021-12-01 日立建機株式会社 建設機械

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JP7234486B2 (ja) 2023-03-08
WO2020020997A1 (de) 2020-01-30
CN112513473A (zh) 2021-03-16
DE102018117949A1 (de) 2020-01-30
CN112513473B (zh) 2024-01-16
US11434936B2 (en) 2022-09-06
US20210190103A1 (en) 2021-06-24
JP2021532314A (ja) 2021-11-25
KR20210036361A (ko) 2021-04-02

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