EP2642132B1 - Agencement de soupape hydraulique avec un agencement de soupape pilote hydraulique - Google Patents

Agencement de soupape hydraulique avec un agencement de soupape pilote hydraulique Download PDF

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Publication number
EP2642132B1
EP2642132B1 EP13001128.1A EP13001128A EP2642132B1 EP 2642132 B1 EP2642132 B1 EP 2642132B1 EP 13001128 A EP13001128 A EP 13001128A EP 2642132 B1 EP2642132 B1 EP 2642132B1
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EP
European Patent Office
Prior art keywords
valve
pilot
control
pilot valve
connector
Prior art date
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Active
Application number
EP13001128.1A
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German (de)
English (en)
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EP2642132A3 (fr
EP2642132A2 (fr
Inventor
Stefan Schmidt
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2642132A3 publication Critical patent/EP2642132A3/fr
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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • 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
    • F15B2211/30—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
    • F15B2211/30575—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 in a Wheatstone Bridge arrangement (also half bridges)
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F15B2211/328—Directional control characterised by the type of actuation electrically or electronically with signal modulation, e.g. pulse width modulation [PWM]
    • 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
    • F15B2211/355—Pilot pressure 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
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • 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
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • 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
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6656—Closed loop control, i.e. control using feedback
    • 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
    • F15B2211/67—Methods for controlling pilot pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87193—Pilot-actuated

Definitions

  • the invention relates to a hydraulic valve arrangement according to the preamble of patent claim 1.
  • a pressure medium volume flow can be controlled in a conventional manner via a continuously variable proportional directional control valve with n connections and m switching positions.
  • this conventional analog control of the pressure medium volume flow brings considerable device and control engineering expenses with it.
  • Each control edge of a conventional proportional directional valve is dissolved via at least one valve with at least one basic and one switching position.
  • this control edge is preferably dissolved in more than one, for example in four or five, switching valves, wherein a ratio of the respective nominal values based on the smallest of the switching valves, for example 2, 4, 8, 16 , ... is.
  • a valve with four control edges is thus replaceable over at least four switching valves.
  • PCM pulse-coded modulation
  • the concept of pulse width modulation can be used.
  • a nominal volume flow of the thus controlled valves can be reduced in that the actuating element of the valve is not continuous but only approximately in the time frame of a pulse or its pulse duration is turned on or fully open.
  • the pulse duration there is a pulse pause in which the valve falls from its switching position to the basic position.
  • the duty cycle about a ratio of the pulse duration to the sum of pulse duration and pulse pause, the duty cycle, the size of the pressure medium volume flow can be adjusted. In this way, a comparatively fine adjustment of the pressure medium volume flow is already possible. From the DE 10 2009 052285 A1 is a balancing valve is known that behaves ballistically.
  • the European patent EP 0 828 946 B1 shows to a pilot valve assembly with a four-way valves having bridge circuit, wherein a valve body of a proportional directional control valve is hydraulically clamped in a first diagonal or in a bridge of the bridge circuit.
  • a pressure medium input of a second diagonal of the bridge circuit is connected to a pressure medium source and a pressure medium output of the second diagonal with a pressure medium sink.
  • Each switching valve has a basic position and a switching position and is for controlling a pressure medium volume flow of the pilot valve arrangement pulse width modulated electromagnetically actuated.
  • a disadvantage of this solution is that a large number of switching valves of different nominal size would still be required for a required large bandwidth of the pressure medium volume flow.
  • a very fast switching switching valve large nominal diameter could be used, but this is expensive.
  • the switching speed can not be increased arbitrarily and also subject to the switching valve due to the fast switching an increased risk of wear.
  • the invention is based on the object to provide a hydraulic valve assembly with a vorzuberichtnden valve in which compared to the prior art with the same or lower device complexity, a pressure medium flow rate for pilot control of the valve is finer controllable.
  • a hydraulic valve arrangement has at least one pilot valve arrangement and, in addition, at least one valve which can be precontrolled via the pilot valve arrangement.
  • the pilot hydraulic valve arrangement for precontrol of the, in particular hydraulic, valve has at least one or a first pulse width modulated actuatable pilot valve, and has a high pressure port for connection to a pressure medium source, a low pressure port for connection to a pressure sink and a first control port for connection to a first Control chamber of the valve to be controlled.
  • the first control connection of the pilot valve arrangement is connected to the first control chamber of the valve to be controlled or at least connectable.
  • the first control connection can be connected to the high-pressure connection or to the low-pressure connection.
  • the first pilot valve is ballistically actuated.
  • a device-type simplified hydraulic valve arrangement is provided, by means of which, moreover, a pressure medium volume flow for precontrol of the valve can be controlled more finely.
  • the term “ballistic” encompasses ballistic and, alternatively, inverse ballistic activity.
  • ballistic activity For a detailed description of the ballistic activity, reference should be made here to the publication " A Novel Model For Optimized Development And Application Of Switching Valves In Closed Loop Control "(International Journal of Fluid Power 12, 2011, No. 3 ) of the Applicant.
  • the first pilot valve can assume intermediate positions (partial openings) which have an opening cross section which is smaller than a maximum open position and greater than a closed position of the first pilot valve.
  • An electromagnetic actuating element of the first pilot valve for example an armature of an electromagnet, can either be de-energized or energized in a basic position.
  • the basic position of the pilot valve may be a flow position or a blocking position, or vice versa.
  • the basic position is preferably spring-biased. If one considers the basic position and the switching position of the first pilot valve as a bit with the values zero or one, then this bit is "divisible" via the principle of ballistic actuation.
  • a pulse duration t i of a ballistic actuation pulse of the at least one pilot valve is greater than a minimum pulse duration t i, min of the at least one pilot valve, starting from a throw of a valve body of the at least one pilot valve out of its basic position in the direction a switching position takes place.
  • the pulse duration t i is so small that no complete throw of the valve body takes place up to the switching position.
  • the pulse duration t i of the actuating pulse of the first pilot valve is at least so great that a complete throw of the valve body of the first pilot valve into its switching position takes place.
  • a following the actuation pulse pause duration t p, in which no actuation pulse is present, is less than a minimum pause duration t p, min, which is necessary for a complete discarding or relapse of the valve body is in its basic position into it.
  • the valve body is thus again thrown by a renewed actuation pulse in the direction of the switching position before it reaches its basic position.
  • the pulse duration t i is preferably between 2 and 3 ms and is shorter than a switching delay time of the first pilot valve, for example 7 ms.
  • the first pilot valve is such configured to have a switching time t s for switching into the switching position of about 7 ms and a switching delay time t i, min of about 2 ms.
  • the pulse duration t i can also assume values equal to or greater than the switching time t s , so that the switching position is switched through after the switching time t s at least for the rest of the pulse duration t i .
  • a fundamental frequency of the pulse width modulation is smaller than a maximum switching frequency of the first pilot valve.
  • the fundamental frequency is about 0.5 to 1.0 times the maximum switching frequency.
  • a preferred variant of the hydraulic pilot valve arrangement of the valve arrangement has a second pilot valve which is connected in series with the first pilot valve in a pressure medium flow path from the high-pressure port to the low-pressure port.
  • the first or the second pilot valve is arranged in a pressure medium flow path from the high pressure port to the first control port and the other of these two pilot valves, ie the second or the first, is arranged in a pressure fluid flow path from the first control port to the low pressure port.
  • the second pilot valve is electromagnetically pulse width modulated ballistically actuated.
  • a preferred development of the hydraulic pilot valve arrangement of the valve arrangement has a second control connection for connection to a second control chamber of the valve to be controlled. In this way, by simply acting on the respective control connection, a valve body of the valve to be controlled can be moved or thrown in opposite directions.
  • a particularly preferred development of the hydraulic pilot valve arrangement of the valve arrangement has a third and a fourth pilot valve. These two pilot valves are connected in series in a pressure fluid flow path from the high pressure port to the low pressure port. Furthermore, the third or the fourth pilot valve in a pressure fluid flow path from the high pressure port to the second control port and the other of these two pilot valves, that is, the fourth or third, is arranged in a pressure fluid flow path from the second control port to the low pressure port.
  • This construction of the hydraulic pilot valve arrangement corresponds to a bridge circuit with two diagonals, wherein a first diagonal is formed via the first and the second control connection and a second diagonal via the high-pressure and the low-pressure connection.
  • pilot valve arrangement in each case a pressure medium volume flow from the high-pressure connection to the low-pressure connection, from the high-pressure connection to the second control connection or second control chamber of the valve to be controlled and from this to the low-pressure connection can be set.
  • at least the third or fourth pilot valve can also be activated by electromagnetic pulse width modulated ballistics. Particularly preferred are both.
  • At least the first pilot valve is designed as a 2/2 switching valve.
  • a force in particular a spring force, which biases a valve body, in particular a valve spool or valve piston, of the switching valve into a basic position, is small compared with an actuating force of the switching valve resulting from the actuating pulse. Therefore, a switching valve can be switched very quickly after application of the actuating pulse in the switching position.
  • at least one of these further pilot valves is preferably designed as a 2/2 switching valve. Particularly preferably, all pilot valves are configured in this way.
  • the basic position of the pilot valve (s) may be an open cross-sectional flow position or a shut-off restricted position, or vice versa.
  • the first pilot valve is a directional control valve which has at least three connections: the high-pressure connection, the low-pressure connection and the first control connection.
  • the directional control valve is preferably configured such that the first control connection connects the first control connection to the high-pressure connection or to the low-pressure connection.
  • the directional control valve is a 3/3-way valve.
  • the hydraulic pilot valve arrangement of the valve arrangement also has the second control connection in an advantageous development.
  • the directional control valve is preferably designed as a 4/3-way valve.
  • At least the first and / or second and / or third and / or fourth pilot valve is designed as a seat valve or as a slide valve.
  • the inventive hydraulic pilot valve arrangement of the valve assembly also has a control unit which is designed such that it is at least the first of the pilot valves electromagnetically pulse width modulated ballistically actuated.
  • a control unit which is designed such that it is at least the first of the pilot valves electromagnetically pulse width modulated ballistically actuated.
  • a multiple or multiplicity of pilot valves, in particular all pilot valves are actuated by means of electromagnetic pulse width modulated ballistics.
  • pilot valve arrangement of the valve arrangement can also have more than four, for example five, six, seven or eight, or more, pilot valves as described above.
  • a preferred variant of the hydraulic valve arrangement has a pilot valve arrangement, which also has the above-described second control connection, which is connectable, in particular connected, to a second control chamber of the valve to be controlled.
  • the first control chamber of the valve to be controlled is limited at least in sections via a first control surface of a valve body of the valve to be controlled and a second control chamber of the vorzuêtnden valve at least partially via a second, the first counteracting control surface of the valve body.
  • the second control chamber can be connected to a connection of essentially constant pressure, in particular connected.
  • the second control chamber of the valve to be controlled is connectable, in particular connected, to the high-pressure connection of the pilot valve arrangement.
  • the pressure medium source of substantially constant pressure is then the high pressure source, whereby in the second control chamber either the high pressure or a pressure dependent thereon is present.
  • maximum pressure is at.
  • the first control surface is preferably larger than the second control surface.
  • the second control chamber of the vorzu tenunden valve with the low pressure port of the pilot valve assembly or with a tank or with the atmosphere connected, in particular connected, and / or the valve body of vorzu tenunden valve is with a force, in particular the force of a spring , acted upon, in particular acted upon, which is directed opposite to a direction of action of the pressure acting on the first control surface pressure.
  • the variant of the connection to the low-pressure connection or the tank is preferred when the valve to be controlled is a slide valve and thus a leakage flow from the first to the second control chamber is possible.
  • the variant of the connection with the atmosphere is preferred when the second control chamber is sealed via a valve seat and thus "dry".
  • FIG. 1 shows a valve assembly 1 with a pilot valve assembly 2, which is flanged to a valve block 8 of the valve 6 for actuating a valve body 4, or a valve piston of a valve formed as a 4/3-way directional control valve 6.
  • the pilot valve assembly 2 opposite to the valve block 8, an end plate 10 is flanged.
  • the valve 6 has a high pressure chamber 12 which is connectable to a high pressure port, not shown.
  • the valve 6 has low-pressure channels 14 and 16, which are connectable to a tank connection (not shown).
  • two consumer ports 18, 20 are arranged, via which the valve 6 is connectable to one or more consumers.
  • the valve body 4 is located according to FIG. 1 in a centered blocking position, so that the high-pressure chamber 12 is shut off against the consumer ports 18, 20 and the low-pressure channels 14, 16.
  • a control surface 22 can be acted upon by control pressure and a second control surface 24 of the valve body 4, both the end plate 10 and a housing 26 of the pilot valve assembly 2, a first control chamber 28 and a second control chamber 30 on.
  • the Control chambers 28, 30 acted upon by the pilot valve assembly 2 with a pressure medium volume flow. Since the two control surfaces 22, 24 are equal, there is a displacement of the valve body 4 at different pressures in the control chambers 28, 30. The displacement continues until no pressure difference between the control chambers 28, 30 is present.
  • the pilot valve arrangement 1 has a bridge circuit 32 with a first, second, third and fourth pilot valve 34, 36, 38 and 40.
  • the pilot valves 34 to 40 are designed as 2/2-way valves. Each of the pilot valves 34 to 40 has a spring-biased basic position and an electromagnetically operable switching position.
  • the bridge circuit 32 has a high pressure port 42, which is connected via a pressure medium channel 44 to a pressure medium source 46. In the pressure medium channel 44, a filter 48 is arranged.
  • the bridge circuit 32 is designed analogously to a Wheatstone bridge. Accordingly, the first and third pilot valves 34 and 38 are connected in parallel with the high pressure port 42.
  • the second and fourth pilot valves 36 and 40 are connected in parallel with a low-pressure port 50 of the bridge circuit 32, wherein the low-pressure port 50 is in turn connected to a pressure medium sink 52 or a tank.
  • the low-pressure connection 50 is preceded by a throttle 54.
  • the bridge circuit 32 thus has between its high pressure port 42 and its low pressure port 50 two parallel pressure fluid flow paths 56, 58, wherein in a first pressure fluid flow path 56, the first pilot valve 34 is arranged in series with the second pilot valve 36.
  • the third pilot valve 38 is arranged in series with the fourth pilot valve 40 in analogy thereto.
  • the first pilot valve 34 is connected via a connecting line to the second pilot valve 36 and the third pilot valve 38 via a different connecting line with the fourth pilot valve 40.
  • a control line 60, 62 branches off from each of the two connection lines from a control connection 59, 61.
  • a pressure medium output of the first pilot valve 34 is connected via the first control connection 59 and the first control line 60 to the first control chamber 28 and a pressure medium output of the third pilot valve 38 via the second control connection 61 and the second control line 62 to the second control chamber 30.
  • the two Control lines 60, 62 form in this way a first diagonal or bridge, in which the valve body 4 of the valve 6 is hydraulically clamped.
  • This is connected to an operating unit 64, via which an operator can specify a desired value for a hydraulic consumer, which can be connected to one or both of the consumer connections 18, 20.
  • the operating unit 64 is connected via a signal line 66 to a control unit 68 of the valve arrangement 1.
  • the pilot valves 34, 36 and 38, 40 are connected to the control unit 68.
  • Said signal lines 70 to 76 represent a signal connection between the control unit 68 and the respective electromagnets 78 to 84 of the pilot valves 34 to 40, or allow their energization.
  • a signal connection between a displacement transducer 88 of the valve body 4 and the control unit 68 continues via a signal line 86. Via the position transducer 88, a position or deflection of the valve body 4 is permanently transmitted to the control unit 68 during normal operation.
  • Each of the pilot valves 34 to 40 is configured as a 2/2-way switching valve and has in each case a spring-biased basic position and an electromagnetically operable switching position.
  • the first pilot valve 34 and the third pilot valve 38 which are arranged adjacent to the high-pressure connection 42 in the bridge circuit, have a spring-biased closed position as the basic position.
  • the pilot valves 36 and 40 which are arranged adjacent to the low-pressure connection 50, have a spring-biased open position as their basic position.
  • valve body 4 in FIG. 1 be moved to the right so that a projecting into a control groove 90 Steuerfase 92 of the valve body 4 projects into the high-pressure chamber 12.
  • the high-pressure chamber 12 from the observation level of FIG. 1 out to the viewer, partially extending around a control collar 94 of the valve body 4 around.
  • a pressure medium connection from the high-pressure chamber 12 via a control gap which is bounded by the Steuerfase 92 and a wall of the valve block 8, towards Consumer connection 20 manufactured.
  • the farther the valve body 4 is moved to the right, the greater the control gap can flow over the pressure medium from the high-pressure chamber 12 to the load port 20.
  • FIG. 1 It can be clearly seen that when the valve body 4 is to be displaced to the right as described above, the second control chamber 30 must be pressurized from the high pressure port 42 via the third pilot valve 38 and the second control line 62, so that in the second control chamber 30th From the subsequent displacement of the valve body 4 and the incompressibility of the pressure medium resulting from the first control chamber 28, a pressure medium volume flow through the control line 60 and the second pilot valve 36 to the low pressure port 50 are enabled got to.
  • the control unit 68 in this example thus has the task of keeping the first pilot valve 34 in its closed basic position, to control the third pilot valve 38 in the direction of its switching position or open position, to leave the second pilot valve 36 in its open position or to ballistically restrict it in the direction of its closed position and to drive the fourth pilot valve 40 in its closed position. Then, a pressure medium volume flow from the high pressure port 42 to the second control chamber 30 and an approximately equal pressure medium volume flow from the first control chamber 28 to the low pressure port 50 to flow.
  • All four pilot valves 34 to 40 are pulse-width modulated electromagnetically actuated. This type of operation is in FIG. 1 symbolized over four schematically illustrated pulse trains. Under ballistic is to be understood that an actuating pulse is not sufficient to turn on the corresponding pilot valve to its switching position, if an intermediate position of the corresponding pilot valve is desired.
  • the solenoid of the pilot valve 38 is applied via the signal line 74 and the control unit 68 with pulses having a pulse duration t i , which is only slightly greater than a minimum pulse duration t i, min , which is necessary, the valve body of the third pilot valve 38 from to take off his basic position.
  • the fourth pilot valve 40 Periodically recurring the valve body of the pilot valve 38 is thrown in this way in an intermediate position with a minimum opening cross-section and falls in the following pulse break back into the spring-biased home position or closed position.
  • the fourth pilot valve 40 is controlled via the control unit 68 and the signal line 76 such that it is permanently shut off in its switching position or closed position.
  • the pulse duration t i can have a value which exceeds the switching time t s of the fourth pilot valve 40.
  • the fourth pilot valve 40 is therefore permanently closed.
  • the second pilot valve 36 remains open in its spring-biased home position or open position. Meanwhile, it is ensured that the first pilot valve 34 is also shut off in its spring-biased home position or closed position. In this way, a pressure medium volume flow generated by the displacement of the valve body 4 into the first control chamber 28 can flow out via the control line 60 and the second pilot valve 36 to the low-pressure connection 50 and into the tank 52.
  • the measured value of the displacement transducer 88 or the position of the valve body 4 is permanently fed back to the control unit 68 via the signal line 86. If the pressure medium volume flow at the consumer connection 20 now corresponds to the desired value preset via the operating unit 64, then the control unit 68 causes an end of the movement of the valve body 4 in the valve block 8. For this purpose, the quantities of pressure medium that are present in the control lines 60 and 62 and in the control chambers 28 and 30 are held constant. Assuming that no leakage occurs in the system under consideration, this is achieved by the first and the third pilot valve 34 and 38 are energized, whereby they fall into their spring-biased closed positions or basic positions. Furthermore, the second and fourth pilot valves 36 and 40 are connected through the control unit 68 and the signal lines 72 and 76 in their closing or switching position.
  • an opening cross-section of the pilot valves 34 (first) or 38 (third) is to be increased depending on the intended direction of movement of the valve body 4. This is achieved particularly fine-scale on the ballistic pulse width modulated electromagnetic actuation.
  • the pulse duration it is t i of the operating pulse compared with the case described above to enlarge for the intended larger volume flows.
  • a pressure medium volume flow actually conveyed into the second control chamber 30 can be reduced by the open position of the fourth pilot valve 40.
  • a degree of reduction can be set as described above ballistic pulse width modulated.
  • the control unit 68 acts on the electromagnet 84 of the fourth pilot valve 40 with pulses of corresponding pulse duration. Each pulse throws the valve body against the spring force in the direction of the switching position or closed position.
  • the fourth pilot valve 40 fulfills an even more throttling function, the longer the pulse duration t i .
  • the fourth pilot valve 40 is then completely closed when the pulse duration t i is sufficiently large and the pulse pause t p is sufficiently small, so that the valve body remains in its switching position.
  • the second pilot valve 36 assumes the above-described Function of the fourth pilot valve 40.
  • a pressure medium volume flow conveyed into the control chambers 28 and 30 can not only be influenced as described above, but also via throttling of the pressure center volume flow flowing out of the respective other control chamber 30 or 28. The more strongly this is throttled, the slower the filling of the control chamber to be filled with pressure medium, resulting in a slower displacement of the valve body 4.
  • FIG. 2 shows a valve assembly 101 with a pilot valve assembly 102, via which the valve 6 is piloted.
  • This corresponds to the vorzuêtnden valve 6 of the first embodiment according to FIG. 1
  • the pilot valve arrangement 102 corresponds but largely with respect to a second and a fourth pilot valve 136, 140 of this.
  • the pilot valve 136, 140 spring-biased in its closed position.
  • the second embodiment corresponds to FIG. 2 according to the first embodiment FIG. 1 ,
  • FIG. 3 shows a technically analogous solution to the second embodiment according to FIG. 2
  • a valve arrangement 201 in this case has a pilot valve arrangement 202 for pilot control of the valve 6.
  • the pilot valve assembly 202 now instead of a plurality of pilot valves only a first pilot valve 234, which is designed as a 4/3-way valve.
  • the first pilot valve 234 has a high-pressure connection 142 connected to the pressure medium source 46, a low-pressure connection 250 connected to a tank, a first control connection 259 connected to the first control chamber 28 of the valve 6 via the first control line 60 and one to the second control chamber 30 of the valve 6 Connected via the second control line 62 second control terminal 261.
  • the actuation of the first pilot valve 234 is carried out electromagnetically pulse width modulated and ballistic over the signal lines indicated by dashed lines.
  • FIG. 4 shows a device-simplified valve assembly 301 with a pilot valve assembly 302, unlike the second embodiment according to FIG. 2 between the high-pressure port 42 and the low-pressure port 50 has only one pressure medium flow path with the first pilot valve 34 and the second pilot valve 136.
  • the two pilot valves 34, 136 correspond to the same named pilot valves of the embodiment according to FIG. 2 , Notwithstanding all previous embodiments, in this case the high-pressure port 42 is connected directly via the second control line 62 to a second control chamber 330 of the valve 306. In the second control chamber 330 is thus always on the high pressure. This is preferably substantially constant, but may also be variable.
  • a fourth embodiment according to FIG. 4 shows the fifth embodiment of a valve assembly 401 according to FIG. 5 , It differs from the valve assembly 301 according to FIG. 4 only in the embodiment of its pilot valve assembly 402.
  • This has only a first pilot valve 434, which is designed as a 3/3-way valve.
  • the first pilot valve 434 has a high-pressure port 242 connected to the pressure medium source 46, a low-pressure port 250 connected to the tank, and the first control port 259 connected to the first control chamber 28 via the first control line 60.
  • the valve 306 corresponds to that of the fourth embodiment FIG. 4
  • the first pilot valve 434 corresponds to the first pilot valve 434 of the still following seventh embodiment according to FIG. 7 and is also in both switch positions a, b electromagnetically pulse width modulated and ballistically actuated.
  • FIG. 6 shows a sixth embodiment of a valve assembly 501 with the pilot valve assembly 302, as already described in the fourth embodiment FIG. 4 and a valve 506 to be controlled.
  • the valve arrangement 501 differs from the valve arrangement 301 according to FIG. 4 only in the area of a second control surface 524 of a second control chamber 530 and its pressure medium supply.
  • the second control chamber 530 is, unlike in all previous embodiments, connected to neither a second control port nor with a high pressure port of the pilot valve assembly. Instead, it is connected via a tank line 596 to a tank T, which has a low pressure level.
  • valve body 4 Since this pressure level is insufficient to establish a balance of forces on the valve body 4, when the first control chamber 28 is acted upon by pressure medium via the high-pressure port 42, the valve body 4 is supported on a valve spring 598 via its second control surface 524. In a displacement of the valve body 4 in FIG. 6 to right, in which the first control chamber 28 is filled by the corresponding ballistic actuation of the first pilot valve 34 with pressure medium, the valve spring 598 is compressed accordingly. With a larger displacement of the valve body 4 thus increases their spring force, which counteracts a resulting from the high pressure applied to the first control surface 22 compressive force. If the valve body 4 in FIG.
  • the first pilot valve 34 is no longer (ballistic) driven and falls back into its spring-biased closed position.
  • the second pilot valve 136 is controlled ballistically in the direction of its switching position or opening position, so that pressure medium from the first control chamber 28 via the first control line 60 and the second pilot valve 136 to the tank T can flow out.
  • the seventh and last embodiment according to FIG. 7 shows a valve assembly 601 extending from the valve assembly 501 according to FIG. 6 only differs by a valve assembly 602.
  • the valve assembly 302 is according to FIG. 6 by a first pilot valve 434, as already described in the fifth embodiment FIG. 5 shown is replaced.
  • the control and operation of the valve 506 corresponds to that of the embodiment according to FIG. 6
  • the structure and operation of the first pilot valve 434 in FIG. 7 correspond to the pilot valve 434 according to FIG. 5 ,
  • pilot valves shown are not limited to the ballistic or inverse ballistic operation, but may also be designed such that a conventional, in particular pulse width modulated, actuation is possible.
  • Each of the pilot valves can have the closed position or the open position as the basic position. Likewise, each of the pilot valves can be controlled ballistically or inversely ballistic. The choice of the basic position and / or the type of ballistic actuation depends on the particular application of the valve assembly or pilot valve assembly.
  • the pilot valve arrangement can have more than four pilot valves, for example six or eight.
  • two or more of the pilot valve arrangements can be interconnected, in particular connected in parallel with one another.
  • a hydraulic valve arrangement with a pilot valve arrangement and with a valve which can be precontrolled via the pilot valve arrangement.
  • the hydraulic pilot valve arrangement for precontrol of the valve has at least one electromagnetic pulse width modulated actuated pilot valve.
  • the pilot valve is ballistically or inversely ballistically actuated.

Claims (13)

  1. Agencement de soupape hydraulique comprenant au moins un agencement de soupape pilote hydraulique (2 ; 102 ; 202 ; 302 ; 402 ; 602) pour la commande pilote d'une soupape, et comprenant au moins une soupape (6 ; 306 ; 506) dont la commande pilote doit être effectuée par l'agencement de soupape pilote (2 ; 102 ; 202 ; 302 ; 402 ; 602), l'agencement de soupape pilote (2 ; 102 ; 202 ; 302 ; 402 ; 602) présentant une première soupape pilote (34 ; 234 ; 434) pouvant être actionnée électromagnétiquement de manière modulée en largeur d'impulsion, un raccord haute pression (42 ; 242) pour le raccordement à une source de fluide sous pression (46) et un raccord basse pression (50 ; 250) pour le raccordement à un puits de fluide sous pression (52), et l'agencement de soupape pilote (2 ; 102 ; 202 ; 302 ; 402 ; 602) présentant un premier raccord de commande (59 ; 259) qui est raccordé ou au moins peut être raccordé à un premier espace de commande (28) de la soupape (6 ; 306 ; 506) dont la commande pilote doit être effectuée, le premier raccord de commande (59 ; 259) pouvant être raccordé au raccord haute pression (42 ; 242) ou au raccord basse pression (250) par le biais d'une position d'ouverture de la première soupape pilote (34 ; 234 ; 434), caractérisé en ce que l'agencement de soupape pilote présente une unité de commande (68) qui est configurée de telle sorte qu'elle permette d'actionner au moins la première soupape pilote (34 ; 234 ; 434) de manière balistique et électromagnétique avec modulation de largeur d'impulsion.
  2. Agencement de soupape selon la revendication 1, dans lequel l'agencement de soupape pilote (2 ; 102 ; 302) présente une deuxième soupape pilote (36 ; 136) qui est montée en série avec la première soupape pilote (34) dans un chemin d'écoulement de fluide sous pression (56) allant depuis le raccord haute pression (42) jusqu'au raccord basse pression (50), et dans lequel la première soupape pilote (34) ou la deuxième soupape pilote (36 ; 136) est disposée dans un chemin d'écoulement de fluide sous pression allant du raccord haute pression (42) jusqu'au premier raccord de commande (59) et dans lequel l'autre respective de ces deux soupapes pilotes (36 ; 136, 34) est disposée dans un chemin d'écoulement de fluide sous pression allant du premier raccord de commande (59) jusqu'au raccord basse pression (50) .
  3. Agencement de soupape selon l'une quelconque des revendications 1 ou 2, dans lequel l'agencement de soupape pilote (2 ; 102 ; 202) présente un deuxième raccord de commande (61 ; 261) pour le raccordement à un deuxième espace de commande (30) de la soupape (6) dont la commande pilote doit être effectuée.
  4. Agencement de soupape selon la revendication 3, dans lequel l'agencement de soupape pilote (2 ; 102) présente une troisième soupape pilote (38) et une quatrième soupape pilote (40), la troisième soupape pilote (38) étant montée en série avec la quatrième soupape pilote (40) dans un chemin d'écoulement de fluide sous pression (58) allant depuis le raccord haute pression (42) jusqu'au raccord basse pression (50), et dans lequel la troisième soupape pilote (38) ou la quatrième soupape pilote (40) est disposée dans un chemin d'écoulement de fluide sous pression allant depuis le raccord haute pression (42) jusqu'au deuxième raccord de commande (61), et dans lequel l'autre respective de ces deux soupapes pilotes (40, 38) est disposée dans un chemin d'écoulement de fluide sous pression allant du deuxième raccord de commande (61) jusqu'au raccord basse pression (50).
  5. Agencement de soupape selon l'une quelconque des revendications 1 à 4, dans lequel au moins la première soupape pilote (34) est réalisée sous forme de soupape de commutation à 2/2 voies.
  6. Agencement de soupape selon la revendication 1, dans lequel la première soupape pilote (234 ; 434) est une soupape de distribution qui présente le raccord haute pression (242) et le raccord basse pression (250) et le premier raccord de commande (259).
  7. Agencement de soupape selon au moins les revendications 1 et 3 et 6, dans lequel la soupape de distribution présente le deuxième raccord de commande (261).
  8. Agencement de soupape selon l'une quelconque des revendications précédentes, dans lequel au moins la première soupape pilote (34 ; 234 ; 434) est réalisée sous forme de soupape à siège ou sous forme de soupape à tiroir.
  9. Agencement de soupape selon l'une quelconque des revendications précédentes, dans lequel la deuxième soupape pilote (36 ; 136) et/ou la troisième soupape pilote (38) et/ou la quatrième soupape pilote (40 ; 140) doivent être commandées de manière balistique et électromagnétique avec modulation de largeur d'impulsion.
  10. Agencement de soupape selon la revendication 3 ou selon l'une quelconque des revendications se rapportant à la revendication 3, dans lequel le deuxième raccord de commande (61 ; 261) de l'agencement de soupape pilote (2 ; 102 ; 202) peut être raccordé à un deuxième espace de commande (30) de la soupape (6) dont la commande pilote doit être effectuée.
  11. Agencement de soupape selon l'une quelconque des revendications précédentes, dans lequel le premier espace de commande (28) de la soupape (306 ; 506) dont la commande pilote doit être effectuée est limité au moins en partie par le biais d'une première surface de commande (22) d'un corps de soupape (304 ; 4) de la soupape (306 ; 506) dont la commande pilote doit être effectuée et un deuxième espace de commande (330 ; 530) de la soupape (306 ; 506) dont la commande pilote doit être effectuée est limité au moins en partie par le biais d'une deuxième surface de commande (324 ; 524) du corps de soupape (306 ; 506) agissant à l'opposé de la première, et le deuxième espace de commande (330 ; 530) pouvant être raccordé à un raccord avec une pression essentiellement constante.
  12. Agencement de soupape selon la revendication 11, dans lequel le deuxième espace de commande (330) de la soupape (306) dont la commande pilote doit être effectuée peut être raccordé au raccord haute pression (42 ; 242) de l'agencement de soupape pilote (302 ; 402) et la première surface de commande (22) est plus grande que la deuxième surface de commande (324).
  13. Agencement de soupape selon la revendication 11, dans lequel le deuxième espace de commande (530) de la soupape (506) dont la commande pilote doit être effectuée peut être raccordé au raccord basse pression de l'agencement de soupape pilote (302 ; 602) ou à un réservoir (T) ou à l'atmosphère et/ou dans lequel le corps de soupape (4) de la soupape (506) dont la commande pilote doit être effectuée peut être sollicité avec une force qui est orientée à l'encontre d'une direction d'action de la pression agissant au niveau de la première surface de commande (22).
EP13001128.1A 2012-03-20 2013-03-06 Agencement de soupape hydraulique avec un agencement de soupape pilote hydraulique Active EP2642132B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210005593 DE102012005593A1 (de) 2012-03-20 2012-03-20 Hydraulische Pilotventilanordnung und hydraulische Ventilanordnung damit

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EP2642132A2 EP2642132A2 (fr) 2013-09-25
EP2642132A3 EP2642132A3 (fr) 2017-07-12
EP2642132B1 true EP2642132B1 (fr) 2019-06-12

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EP13001128.1A Active EP2642132B1 (fr) 2012-03-20 2013-03-06 Agencement de soupape hydraulique avec un agencement de soupape pilote hydraulique

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US (1) US20130248032A1 (fr)
EP (1) EP2642132B1 (fr)
CN (1) CN103321978B (fr)
DE (1) DE102012005593A1 (fr)

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CN105593536B (zh) * 2013-07-18 2017-07-07 Abb 技术有限公司 具有故障冻结模式的分立式先导级阀装置
CN104235098B (zh) * 2013-12-23 2016-08-17 江苏恒立液压科技有限公司 液压阀装置
DK3141971T3 (da) * 2015-09-11 2021-12-06 Alfa Laval Corp Ab Opsætning af ventilstyreenhed
CN107339275A (zh) * 2017-08-22 2017-11-10 谭振达 一种高速数字开关先导阀

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Also Published As

Publication number Publication date
EP2642132A3 (fr) 2017-07-12
US20130248032A1 (en) 2013-09-26
CN103321978A (zh) 2013-09-25
CN103321978B (zh) 2017-03-01
EP2642132A2 (fr) 2013-09-25
DE102012005593A1 (de) 2013-09-26

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