EP3597941A1 - Procédé de fonctionnement d'un consommateur hydraulique par une soupape de commande actionnée électriquement - Google Patents

Procédé de fonctionnement d'un consommateur hydraulique par une soupape de commande actionnée électriquement Download PDF

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Publication number
EP3597941A1
EP3597941A1 EP19185918.0A EP19185918A EP3597941A1 EP 3597941 A1 EP3597941 A1 EP 3597941A1 EP 19185918 A EP19185918 A EP 19185918A EP 3597941 A1 EP3597941 A1 EP 3597941A1
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EP
European Patent Office
Prior art keywords
control unit
valve
control
swivel angle
hydraulic
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.)
Granted
Application number
EP19185918.0A
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German (de)
English (en)
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EP3597941B1 (fr
Inventor
Andreas Remmelmann Dr.
Christian Brüser Dr.
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.)
Deere and Co
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Deere and Co
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Publication date
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Publication of EP3597941A1 publication Critical patent/EP3597941A1/fr
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    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/002—Calibrating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/28—Control of machines or pumps with stationary cylinders
    • F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002—Hydraulic systems to change the pump delivery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/082—Servomotor systems incorporating electrically operated control means with different modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F04B49/106—Responsive to pumped volume
    • 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
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • 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
    • F15B2211/6055—Load sensing circuits having valve means between output member and the load sensing circuit using pressure relief 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
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply 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
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    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
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    • 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
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    • 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
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    • 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
    • F15B2211/6653—Pressure control
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    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
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    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
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    • F15B2211/6658—Control using different modes, e.g. four-quadrant-operation, working mode and transportation mode
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    • 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
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    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8643—Control during or prevention of abnormal conditions the abnormal condition being a human failure
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    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
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    • F15B2211/88—Control measures for saving energy

Definitions

  • the invention relates to a method for operating a hydraulic consumer on an electrically actuable control valve which, in an open valve position, establishes a connection between a valve inlet and a pilot line connected to a control connection for influencing a pivoting angle which can be set on an axial piston pump and which adjoins a valve inlet , provides system pressure dependent on the swivel angle.
  • Such hydraulic consumers are used, for example, in agricultural add-on devices or auxiliary devices for performing a wide variety of work functions, these being connected via associated hydraulic hoses to a control valve block comprised by an agricultural tractor.
  • the control valve block consists of a large number of electrically actuable control valves, each of which has a first and second hydraulic connection, which acts as a feed or return, for attaching a respective hydraulic consumer.
  • the valve position of the control valve can be set as desired by the operator via a control terminal provided in the agricultural tractor.
  • hydraulic consumers where, due to the principle, no (appreciable) flow volume flows during operation, so that the system pressure built up by the axial piston pump unnecessarily assumes a maximum value due to the hydraulic back pressure that occurs.
  • hydraulic consumers designed as hydraulic linear actuators.
  • the two different approaches reflect two different types of consumers.
  • the first type of consumer according to (i) is generally a hydraulic rotary drive with continuous hydraulic consumption, whereas the second type of consumer according to (ii) typically includes hydraulic linear actuators with a more or less limited travel.
  • the method according to the invention makes it possible for each of the two consumer types to reliably detect a misadjustment which leads to corresponding hydraulic power losses and to remedy it by initiating suitable countermeasures.
  • Operator information indicating the incorrect setting is preferably output via a display terminal connected to the control unit.
  • the operator information can indicate the type of incorrect setting and / or on the affected hydraulic consumer as well as recommendations or instructions for the initiation of suitable countermeasures.
  • suitable countermeasures can be initiated so that if the control valve is incorrectly set, the control unit adjusts the valve position to the delivery volume flow resulting from the current swivel angle of the axial piston pump.
  • the detection of the swivel angle takes place here by means of a rotary encoder, the angle information of which is fed to the control unit, for example via a CAN data bus, for evaluation.
  • the control valve is closed until the value of the delivery volume flow to be expected on the basis of the valve position of the control valve matches the (actual) delivery volume flow resulting from the respective swivel angle.
  • the need for subsequent throttling, including the associated hydraulic power losses, can accordingly be avoided.
  • the control unit can easily determine whether the value of the delivery volume flow at the control valve corresponding to the current swivel angle has been reached on the basis of a drop in the speed of the hydraulic consumer which occurs when the valve is closed further.
  • the speed is available, for example, on an ISOBUS data network communicating with the agricultural implement, via which speed information from a speed sensor assigned to the hydraulic consumer is transmitted to the control unit.
  • the associated valve position can then be in a storage unit connected to the control unit stored so that it is available when the same hydraulic consumer is reconnected and does not have to be determined again.
  • an overpressure valve that is adjustable with regard to a pressure threshold value is arranged on the control valve between the pilot line and the valve outlet, in the event of a detected incorrect setting of the system pressure, the pressure threshold value from the control unit corresponding to a specific pressure requirement of the hydraulic Consumer is reduced.
  • Control valves of this type equipped with an adjustable pressure relief valve are available as standard, so that the implementation of such a function is possible without any problems.
  • the specific pressure requirement can be predetermined and stored in a storage unit connected to the control unit. It is conceivable here that the associated pressure threshold value on the part of the operator can be specified by selecting the agricultural implement to be operated from a device database via an operator terminal connected to the control unit. It is therefore unnecessary to enter the pressure threshold value (which is usually unknown to the operator). Deviating from this, the agricultural implement to be operated can be selected from the implement database on the basis of a implement identifier transmitted to the control unit via an ISOBUS data network or via RFID data transmission. In addition, a transfer of the pressure threshold value to be set per se is also possible. Generally speaking, there is the possibility that the control unit has the specific pressure requirement or corresponding information be communicated by the hydraulic consumer via a data network communicating with the control unit.
  • the specific pressure requirement is determined by the control unit on the basis of an operating pressure drop occurring at the hydraulic consumer and to be stored in an associated storage unit with an identifier of the hydraulic consumer in question, so that it can be used again at a later point in time Use is available.
  • This procedure is particularly useful for agricultural attachments with hydraulic consumers whose specific pressure requirements cannot be called up by selecting them from a device database and are therefore unknown.
  • the device database can then be supplemented with the determined specific pressure requirement with regard to the agricultural implement.
  • the operating pressure in question is available, for example, on an ISOBUS data network communicating with the agricultural implement, via which operating pressure information from an operating pressure sensor assigned to the hydraulic consumer is transmitted to the control unit.
  • the adjustment of the valve position or the reduction of the pressure threshold value can also be carried out manually via an operator terminal connected to the control unit, so that the operator has full control over the adjustment process at all times.
  • the operator receives feedback via a display terminal connected to the control unit as soon as the valve position with the flow volume flow of the axial piston pump resulting from the current swivel angle or at the valve inlet system pressure corresponds to the specific pressure requirement of the hydraulic consumer.
  • Fig. 1 shows an arrangement encompassed by a commercial vehicle for carrying out the method according to the invention.
  • the commercial vehicle (not shown in more detail) is an agricultural tractor 10 to which an agricultural attachment or additional device 12 is attached to a coupling device located in a rear or front area.
  • the coupling device is, for example, as Three-point linkage or designed as a pull or coupling mouth.
  • the arrangement 14 comprises a microprocessor-controlled control unit 16 and a control valve block 20 consisting of a plurality of electrically actuable control valves 18a, 18b. Typically, up to eight control valves are combined in a common control valve block 20, but in the present case only two are shown for reasons of clarity.
  • Each of the control valves 18a, 18b has an inlet or return in the form of first hydraulic connections 22a, 22b and second hydraulic connections 24a, 24b for operating a respective hydraulic consumer 26a, 26b of the agricultural implement 12.
  • connection is made via hydraulic hoses 28a, 28b, 30a, 30b communicating with the hydraulic consumers 26a, 26b, at the open ends of which hydraulic couplers 32a, 32b, 34a, 34b are attached, which are connected to a respective coupling socket 36a, 36b, 38a, 38b of the respective one Let the control valve 18a, 18b releasably connect.
  • each of the control valves 18a, 18b has a valve inlet 42a, 42b connected to an axial piston pump 40 and a valve outlet 46a, 46b opening into a hydraulic sump 44.
  • a pilot line 50 connected to a control connection 48a, 48b of the control valve 18a, 18b serves to influence a swivel angle ⁇ adjustable on the axial piston pump 40, so that a system pressure p sys which is dependent on the swivel angle ⁇ is provided at the valve inlet 42a, 42b.
  • the control valves 18a, 18b can be moved from a closed valve position 56a, 56b into a first opened valve position 58a, 58b or a second opened valve position 60a, 60b by means of associated solenoids 52a, 54a, 52b, 54b, against a restoring spring force, whereby these differentiate in each case with regard to the direction of the hydraulic flow to the hydraulic consumer 26a, 26a.
  • the function of the first and second hydraulic connections 22a, 22b, 24a, 24b as inlet or return is therefore reversible depending on the opening direction of the control valve 18a, 18b.
  • control valve 18a, 18b when the control valve 18a, 18b is opened, a connection is established between the valve inlet 42a, 42b and the pilot line 50 communicating with the control connection 48a, 48b.
  • the control pressure present at the control connection 48a, 48b or the pilot line 50 results here from the degree of opening of the control valve 18a, 18b and assumes the system pressure p sys present at the valve inlet 42a, 42b if it is fully open.
  • the one-way valves 62a, 62b connected downstream of the control connections 48a, 48b ensure that the control valves 18a, 18b each have the highest of the control pressures at the pilot line 50 leading to the axial piston pump 40.
  • Fig. 1 two different control valve types 64a, 64b are shown.
  • the first control valve type 64a is of a conventional type
  • the second control valve type 64b has a pressure relief valve 66 which can be set with respect to a pressure threshold and which is arranged between the pilot line 50 and the valve outlet 46a, 46b.
  • the two control valve types 64a, 64b can be present in any combination within the control valve block 20.
  • Two different consumer types 68a, 68b are each connected to the two representatively shown control valve types 64a, 64b.
  • the first consumer type 68a is a hydraulic rotary drive 70 with continuous hydraulic consumption
  • the second consumer type 68b is formed by a hydraulic linear actuator 72.
  • the two hydraulic consumers 26a, 26b are intended to be part of an agricultural attachment 12 designed as a sowing unit 74 and serve to drive a blower 76 or to actuate a contact pressure control comprised by a row sowing unit 78.
  • the operation of the first consumer type 68a is compatible with both control valve types 64a, 64b, while the operation of the second consumer type 68b absolutely requires the second control valve type 64b.
  • each control valve 18a, 18b can be adjusted on the operator side via a control terminal 80 provided in the agricultural tractor 10.
  • the control unit 16 is next to the operator terminal 80, also with a display terminal 82, a storage unit 84, a data interface 88 communicating with an ISOBUS data network 86 of the agricultural implement 12, a rotary encoder 90 for detecting the swivel angle ⁇ set on the axial piston pump 40 and a pressure sensor 92 for detecting that at the valve inlets 42a, 42b applied system pressure p sys in connection.
  • the angle information of the rotary encoder 90 is fed to the control unit 16 together with the system pressure information provided by the pressure sensor 92 via a CAN data bus 94 of the agricultural tractor 10 for evaluation.
  • the ISOBUS data network 86 transmits, among other things, speed information from a speed sensor 96 assigned to the hydraulic rotary drive 70 and operating pressure information from an operating pressure sensor 98 assigned to the hydraulic linear actuator 72, which represent the operating pressure applied to the hydraulic linear actuator 72 on the input side.
  • an individual device identifier of the connected agricultural implement 12 is transmitted to the control unit 16 via the ISOBUS data network 86.
  • the display terminal 82 is either designed as a separate unit from the operator terminal 80 or else combined with the operator terminal 80 in the form of a touch-sensitive screen.
  • Fig. 2 shows an embodiment of the method according to the invention illustrated in a flow chart.
  • the method is initiated in a starting step 100 when the agricultural tractor 10 is started up.
  • the control unit 16 is supplied with the information obtained by sensors with respect to the current system pressure p sys and the current swivel angle ⁇ of the axial piston pump 40 via the CAN data bus 94.
  • these are used by the control unit 16 in order to infer a possible incorrect setting of the first control valve 18a or the system pressure p sys generated by the axial piston pump 40. There are different procedures for this, depending on the connected consumer types 68a, 68b.
  • the control unit 16 concludes in a second step 104 that the first control valve 18a is incorrectly set when it detects that a delivery volume flow of the axial piston pump 40 resulting from the current swivel angle ⁇ is smaller than that due to the valve position of the first control valve 18a expected value.
  • the latter is derived by the control unit 16 from the control current flowing to actuate the respective solenoid 52a, 54a, for which purpose it uses a control curve stored in the storage unit 84 for the first control valve 18a.
  • control unit 16 concludes in a second step 104 that the system pressure p sys is incorrectly set , if it recognizes that the system pressure p sys present at the valve inlets 42a, 42b is at a maximum without a (significant) delivery volume flow flowing from the second control valve 18b in the direction of the hydraulic linear actuator 72.
  • operator information indicating an incorrect setting is output via the display terminal 82 connected to the control unit 16.
  • the operator information contains information on the type of incorrect setting and / or on the hydraulic consumer 26a, 26b concerned, as well as recommendations for action or instructions for initiating suitable countermeasures. These are explained below.
  • a fourth step 108 to initiate suitable countermeasures it is provided that if the incorrect setting of the first control valve 18a is detected, the valve position of the control unit 16 (either upon the operator's prior request or automatically - see the following description in this regard ) is adapted to the delivery volume flow resulting from the current swivel angle ⁇ of the axial piston pump 40.
  • the first control valve 18a is closed by the control unit 16 until the value of the delivery volume flow to be expected on the basis of the valve position of the first control valve 18a matches the (actual) delivery volume flow of the axial piston pump 40 resulting from the respective swivel angle ⁇ within predetermined tolerances.
  • the control unit 16 detects in the fourth step 108 whether the value of the delivery volume flow corresponding to the current swivel angle ⁇ is set on the first control valve 18a, due to a drop in the speed of the hydraulic rotary drive 70 that occurs when the valve is closed further, for which purpose the speed information transmitted via the ISOBUS data network 86 the speed sensor 96 assigned to the hydraulic rotary drive 70 can be evaluated by the control unit 16.
  • the first control valve 18a is then opened again so far that the observed speed drop does not yet occur.
  • the associated valve position is then stored in a fifth step 110 in the storage unit 84 connected to the control unit 16, so that it is available when the same hydraulic rotary drive 70 or the agricultural attachment 12 comprising it is reconnected and does not have to be determined again ,
  • a sixth step 112 to initiate suitable countermeasures it is provided that in the event of a detected incorrect setting of the system pressure p sys, the pressure threshold value of the pressure relief valve 66 is reduced by the control unit 16 in accordance with a specific pressure requirement of the hydraulic linear actuator 72.
  • the specific pressure requirement of the hydraulic consumer 26b in question (here the hydraulic linear actuator 72) is fixed and that with the Control unit 16 stored related storage unit 84.
  • the associated pressure threshold value is selected by the operator by selecting the agricultural attachment 12 to be operated from a device database via the operator terminal 80 connected to the control unit 16.
  • the agricultural implement 12 to be operated is selected from the implement database on the basis of the implement identifier transmitted via the ISOBUS data network 86.
  • the specific pressure requirement is determined by the control unit 16 in a sixth step 112 on the basis of an operating pressure drop occurring at the hydraulic linear actuator 72 and is stored in the memory unit 84 connected to the control unit 16 by assigning an identifier to the hydraulic linear actuator 72 so that it can be used again later.
  • the control unit 16 evaluates the operating pressure information of the operating pressure sensor 98 assigned to the hydraulic linear actuator 72 and transmitted via the ISOBUS data network 86. This procedure is particularly useful for agricultural attachments with hydraulic consumers whose specific pressure requirements cannot be called up by selecting them from a device database and are therefore unknown.
  • the adjustment of the valve position or the reduction of the pressure threshold value is carried out manually in the sixth step 112 by the operator via the operating terminal 80 connected to the control unit 16.
  • the operator receives feedback via the display terminal 82 connected to the control unit 16 as soon as the valve position with the delivery volume flow of the axial piston pump 40 resulting from the current swivel angle ⁇ or at the valve inlets 42a, 42b applied system pressure p sys corresponds to the specific pressure requirement of the respective hydraulic consumer 26a, 26b within predetermined tolerances.
  • the method is then ended in a final step 114.
  • the method according to the invention makes it possible for each of the two consumer types 68a, 68b to reliably detect an incorrect setting which leads to corresponding hydraulic power losses and to correct it by taking suitable countermeasures.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Fluid-Pressure Circuits (AREA)
EP19185918.0A 2018-07-19 2019-07-12 Procédé de fonctionnement d'un consommateur hydraulique par une soupape de commande actionnée électriquement Active EP3597941B1 (fr)

Applications Claiming Priority (1)

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DE102018212077.3A DE102018212077A1 (de) 2018-07-19 2018-07-19 Verfahren zum Betreiben eines hydraulischen Verbrauchers an einem elektrisch betätigbaren Steuerventil

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EP3597941B1 (fr) 2021-12-01
US11326592B2 (en) 2022-05-10
DE102018212077A1 (de) 2020-01-23
US20200025193A1 (en) 2020-01-23

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