EP4065850A1 - Hydraulic system with a switch valve block for a hydraulically actuatable working machine - Google Patents
Hydraulic system with a switch valve block for a hydraulically actuatable working machineInfo
- Publication number
- EP4065850A1 EP4065850A1 EP20820813.2A EP20820813A EP4065850A1 EP 4065850 A1 EP4065850 A1 EP 4065850A1 EP 20820813 A EP20820813 A EP 20820813A EP 4065850 A1 EP4065850 A1 EP 4065850A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve block
- pressure
- hydraulic
- hydraulic system
- steering
- 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
Links
- 239000012530 fluid Substances 0.000 claims abstract description 62
- 238000013461 design Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- F15B11/17—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
- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check 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
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
- F15B2211/41518—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve being connected to multiple pressure sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/426—Flow 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
- F15B2211/63—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
- 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
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6654—Flow rate 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
- F15B2211/70—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
- F15B2211/781—Control of multiple output members one or more output members having priority
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/862—Control during or prevention of abnormal conditions the abnormal condition being electric or electronic failure
- F15B2211/8626—Electronic controller failure, e.g. software, EMV, electromagnetic interference
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
- F15B2211/8633—Pressure source supply failure
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/87—Detection of failures
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/875—Control measures for coping with failures
- F15B2211/8757—Control measures for coping with failures using redundant components or assemblies
Definitions
- Hydraulic system with a switch valve block for a hydraulically operated machine
- the present invention relates to a hydraulic system with a diverter valve block for a hydraulically actuated work machine.
- Work machines typically have several hydraulic consumers, for example a hydraulic steering system or a hydraulic lifting or tilting cylinder for lifting or tipping a load. If these various hydraulic consumers are actuated by a common hydraulic fluid pump, the pump must continuously provide the highest pressure required by the hydraulic consumers. This leads to the fact that under certain circumstances fluid is supplied to a consumer under very high pressure, although this consumer does not need such a high pressure and this only because the other consumer is currently requesting a very high fluid pressure to carry out its movement. This leads to considerable losses, which reduce the efficiency of such a work machine.
- a vehicle control unit While the machine is in operation, a vehicle control unit records and determines the oil requirement (or hydraulic fluid requirement) of each hydraulic work function depending on the driver's specifications (e.g. an operator joystick). Depending on this requirement, the vehicle control decides on the interconnection of inputs and outputs in the switch valve block or on the actuation / adjustment of the valves contained ("switch position"). The result is the required amount of oil for each work function.
- the hydraulic system according to the invention for a hydraulically actuated work machine comprises a switch valve block with several
- Valve block inputs for connecting to a pressure output of one or more hydraulic fluid pumps, several valve block outputs for
- Dispensing a pressurized hydraulic fluid and at least one valve, which is arranged between valve block inlets and valve block outlets and is designed to produce a fluid connection between a first valve block inlet and a first valve block outlet or the first valve block inlet and a second valve block outlet.
- Hydraulic system further comprises several pressure sources, preferably several separately controllable pressure sources, several, but not necessarily all, of which are connected to a respective valve block inlet, and several hydraulic consumers, each of which is connected to a respective valve block outlet.
- the hydraulic system is characterized in that the first valve block outlet also already has a fixed fluid connection, preferably a fixed exclusive fluid connection, with a second valve block inlet, and the steering is connected to the first valve block outlet. Since it is now possible according to the present invention that two different pressure sources can be used to actuate the steering, it can still be supplied with pressurized fluid if one of the pressure sources fails and the valve is in a corresponding position.
- the at least one valve is a diverter valve which connects a valve block inlet exclusively to one of the multiple valve block outlets.
- the diverter valve therefore connects the valve block input with one of the multiple valve block outputs, but can also switch the valve block input to at least one other valve block output in a different switching position.
- the multiple pressure sources are provided by at least two hydraulic fluid pumps, each of which has at least one pressure outlet, preferably at least one separately controllable pressure outlet.
- first valve block input is connected to a pressure output of the first hydraulic fluid pump and the second valve block input is connected to a pressure output of the second hydraulic fluid pump.
- one of the multiple hydraulic fluid pumps can fail without a total failure of the hydraulic fluid supplied to the steering system.
- the hydraulic fluid pump that has not failed is still able to deliver pressurized fluid to operate the steering.
- each of the at least two hydraulic fluid pumps has its own control unit, which are preferably connected to different power supplies.
- At least one of the two hydraulic fluid pumps can thus continue to be operated even in the event of a power failure in one of the two power supplies.
- the separate control units of the at least two hydraulic fluid pumps are connected to one another in order to open the valve independently of other control requirements in the event of a fault in the pressure source that is connected to the second valve block input and represents the fixed and non-switchable fluid connection for the steering to switch the first valve block output in order to continue to ensure a fluid supply for the steering.
- the switch valve is switched so that the other pressure source, the fluid of which can be routed to the steering or another valve block outlet depending on the switch position, is routed to the steering.
- the failure of the pressure source that is permanently linked to the steering is at least partially compensated for.
- a sensor for detecting the load pressure is arranged downstream of the first valve block outlet, preferably directly in front of a steering cylinder, which is connected to the control units of the at least two hydraulic fluid pumps, preferably to enable the steering in one Pressure control mode is working.
- two independent sensors for the respective detection of the load pressure can preferably be arranged downstream of the first valve block output, each of which is connected to the control units of the at least two hydraulic fluid pumps, the two independent sensors preferably having a different design and / or a different measuring range.
- the implementation of the two sensors creates a redundancy that reduces the probability of failure of a pressure measurement at this point. It is advantageous if the sensors are not structurally identical and / or cover different pressure value ranges.
- control units are designed to apply a constant pressure to the in the event of a fault Provide steering.
- This constant pressure can, for example, be in the middle of the normal working range of the steering pressure. The result of this would be less sensitive steering, but this would not be of importance in terms of functional safety.
- a check valve is provided at each pressure output of the at least two hydraulic pumps and the control units are designed to monitor the functionality of the sensors at the pressure output by using the value of the sensor to detect the steering supply pressure , preferably by means of a test, according to which the pump outputs connected to the steering can never show higher values than the higher-level pressure sensor. If one assumes that the pressure sources connected to the steering generate a pressure which is never above the superordinate steering supply pressure, this information can be used to identify faulty pressure sensors at the pressure outputs of a respective hydraulic fluid pump.
- the check valves ensure that there is no unwanted outflow of hydraulic fluid from the diverter valve block, but that it can only leave the block via the valve block outputs.
- a check valve is provided at each pressure output of the at least two hydraulic pumps and, if one of the control units detects a failure of a sensor at the pressure output, control of the pressure source linked to the failed sensor is continued using the sensor to detect the steering supply pressure becomes.
- the sensor for detecting the steering supply pressure is arranged immediately after the valve block outlet.
- the second valve block outlet is connected to working hydraulics, for example a tilting cylinder or a lifting cylinder.
- the invention also relates to a work machine, in particular a wheel loader with a hydraulic system according to one of the preceding variants.
- valve block inlet and outlet a direct connection, e.g. from the pressure source P1, bypassing a physically formed diverter valve block to a hydraulic consumer is also covered by the scope of protection of the present invention.
- the switch block as well as the valve block inlet and outlet are structures to be defined abstractly, so that a direct connection of a pressure source with a hydraulic consumer, in particular a steering control, also falls within the scope of protection of the present application.
- the direct connection does not necessarily have to take place via a (physical) switch valve block. It is essential for the invention that the hydraulic consumer is linked to a direct connection to a pressure source so that the fluid flowing therefrom is immediately available.
- a direct hose connection for example, from a pressure source to a hydraulic consumer, in particular the steering, is included in the scope of the invention.
- Fig. 2 a schematic representation of an inventive
- FIG. 3 a schematic representation of a further embodiment of the hydraulic system according to the invention in an abstract form.
- Fig. 1 shows a schematic representation of a hydraulic system.
- a motor 1 can be seen which drives two pumps 3 via a transfer case 2.
- One of the two pumps 3 has a pressure source P1, which is directly connected to a steering control 4, so that the fluid pressure or fluid quantity provided by the pressure source P1 is used to actuate the steering cylinder 6.
- the control valve block 5 On the right-hand side of FIG. 1, next to the diverter valve block 9, the control valve block 5 is arranged, in which the hydraulic consumers tilting 51 and lifting 52, as well as other consumers 53, 54 not named by name are arranged.
- the tilt control 51 With the appropriate valve position of the switch valves V1 to V7 in the Switch valve block 9, the tilt control 51 can be linked to the pressure sources P2 and P4 to P8, so that there is sufficient power for the tilting function to actuate the tilting cylinder 7.
- the situation is similar with the lifting control 52, which can also be connected to the associated pressure sources P3 to P8 when the valves V2 to V7 are in the appropriate position.
- the lifting control 52 can also pass on pump power to the other consumers 53, 54, which are not shown in detail for reasons of simplicity.
- the pumping power of the multiple pressure sources can accordingly be directed to a respective consumer 6, 7, 8 depending on the current requirement, with the typically associated disadvantages of poor response behavior being cushioned by the fact that particularly sensitive consumers, e.g. the steering, are permanently and is connected exclusively to one pressure source (here the pressure source P1).
- FIG. 2 shows an implementation of the present invention in which not only the steering control 4 now has an exclusive pump capacity, but also the lifting control 52.
- the pumps P7 and P8 are exclusive and unchangeable to the hydraulic consumer “lifting” for actuating the lifting cylinder 8 assigned.
- the tilt control 51 can be connected to a total of four pressure sources P2 to P4 and P6 when the valves V1-V3 and V5 are in the appropriate position. It is also possible that the further consumers 53 and 54 are supplied via the tilt control 51 (and not, as shown in FIG. 2, via the lifting control 52).
- the pressure output P1 of the left pump 3 is already firmly connected to the steering control 4, so that the fluid flowing out of the pressure output P1 is completely available for the steering control.
- a further pressure source P5 of the other hydraulic fluid pump 3 (in FIG. 2 the right pump 3) of the steering control 4 pass through the valve V4.
- the pressure outputs P1 and P2 can no longer deliver sufficient hydraulic fluid due to a pump defect, or if hydraulic fluid is only available under very low pressure, it can be ensured by switching the valve V4 that the steering control continues to be supplied with sufficient hydraulic fluid.
- the amount and the pressure of the hydraulic fluid, which is made available via the pressure outlet P5, are at least sufficient for emergency steering capability. In such a state, the usual steering comfort is not provided, but safe steering and maintaining maneuverability are guaranteed. As a result, a more fault-tolerant steering is created which continues to work reliably even if one of the two pumps 3, 3 shown fails.
- the switch block 9 is now shown in a simplified manner and no longer shows the complete interconnection of the pressure outputs of the pumps 3, 3 but only those of the pressure outputs P1 and P5.
- the pressure output of the pressure source P1 is permanently and unchangeably connected to the steering control 4.
- the pressure output of the Pressure source P5 runs to a switch valve 10, which optionally connects the pressure output P5 with the working hydraulics A (not shown) or the steering control 4. It can also be seen that each of the two hydraulic fluid pumps 3, 3 has its own control unit 13, 14, which are connected to one another.
- control units 13, 14 are different.
- Supply voltages 15, 16 are supplied with energy, so that even if one of the two supply voltages 15, 16 fails, at least one of the two pumps 3, 3 can still be controlled.
- a further pressure sensor 18 is arranged directly after the switch block, which measures the pressure entering the steering control. This measured pressure is passed on to the two control units 13, 14 via a data line, it being possible for this to take place via an optional vehicle control.
- this value can be used if a pressure measurement from a pressure source P1 or P5 should fail.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019132884.5A DE102019132884A1 (en) | 2019-12-03 | 2019-12-03 | Hydraulic system with a switch valve block for a hydraulically operated machine |
PCT/EP2020/084525 WO2021110866A1 (en) | 2019-12-03 | 2020-12-03 | Hydraulic system with a switch valve block for a hydraulically actuatable working machine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4065850A1 true EP4065850A1 (en) | 2022-10-05 |
Family
ID=73748044
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20820813.2A Pending EP4065850A1 (en) | 2019-12-03 | 2020-12-03 | Hydraulic system with a switch valve block for a hydraulically actuatable working machine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230009724A1 (en) |
EP (1) | EP4065850A1 (en) |
JP (1) | JP2023505480A (en) |
CN (1) | CN115038880A (en) |
DE (1) | DE102019132884A1 (en) |
WO (1) | WO2021110866A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5857504A (en) * | 1981-10-02 | 1983-04-05 | Hitachi Constr Mach Co Ltd | Controller for hydraulic circuit |
JPH11181842A (en) * | 1997-12-18 | 1999-07-06 | Komatsu Ltd | Hydraulic pump circuit for wheel loader |
JP2004150115A (en) * | 2002-10-30 | 2004-05-27 | Komatsu Ltd | Hydraulic control device |
GB0614534D0 (en) * | 2006-07-21 | 2006-08-30 | Artemis Intelligent Power Ltd | Fluid power distribution and control system |
DE102008008102A1 (en) * | 2008-02-08 | 2009-08-13 | Robert Bosch Gmbh | Method for supplying pressure medium to e.g. hydraulic cylinders of hydraulic excavator, involves attaching consumer similar with respect to load pressure or required stream to one pump |
DE102012010847A1 (en) * | 2012-05-31 | 2013-12-05 | Liebherr-France Sas | Hydraulic control block and hydraulic system |
DE112013003540B4 (en) * | 2012-09-20 | 2019-06-19 | Hitachi Construction Machinery Co., Ltd. | Drive device for a work machine and thus equipped work machine |
WO2014097423A1 (en) * | 2012-12-19 | 2014-06-26 | 株式会社 島津製作所 | Hydraulic circuit and cargo-handling vehicle |
DK3009689T3 (en) * | 2014-10-15 | 2021-07-05 | Danfoss Power Solutions Aps | A vehicle's hydraulic system |
DE102017005479A1 (en) * | 2017-06-08 | 2018-12-13 | Hydac Systems & Services Gmbh | Pressure supply device |
-
2019
- 2019-12-03 DE DE102019132884.5A patent/DE102019132884A1/en active Pending
-
2020
- 2020-12-03 JP JP2022533216A patent/JP2023505480A/en active Pending
- 2020-12-03 WO PCT/EP2020/084525 patent/WO2021110866A1/en unknown
- 2020-12-03 CN CN202080084203.7A patent/CN115038880A/en active Pending
- 2020-12-03 US US17/782,221 patent/US20230009724A1/en active Pending
- 2020-12-03 EP EP20820813.2A patent/EP4065850A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US20230009724A1 (en) | 2023-01-12 |
CN115038880A (en) | 2022-09-09 |
WO2021110866A1 (en) | 2021-06-10 |
DE102019132884A1 (en) | 2021-06-10 |
JP2023505480A (en) | 2023-02-09 |
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