EP4278044A1 - Verdichtungsfahrzeug, bei welchem ein fahrantrieb und eine vibrationseinheit von einer gemeinsamen versorgungstelle her mit druckfluid versorgt werden - Google Patents
Verdichtungsfahrzeug, bei welchem ein fahrantrieb und eine vibrationseinheit von einer gemeinsamen versorgungstelle her mit druckfluid versorgt werdenInfo
- Publication number
- EP4278044A1 EP4278044A1 EP22700286.2A EP22700286A EP4278044A1 EP 4278044 A1 EP4278044 A1 EP 4278044A1 EP 22700286 A EP22700286 A EP 22700286A EP 4278044 A1 EP4278044 A1 EP 4278044A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydraulic machine
- hydraulic
- supply point
- displacement volume
- pressure
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
- E01C19/286—Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll
Definitions
- Compaction vehicle in which a travel drive and a vibration unit are supplied with pressurized fluid from a common supply point
- the invention relates to a compaction vehicle according to the preamble of claim 1.
- a compaction vehicle in the form of a road roller is known from EP 1342849 B1.
- the compaction vehicle has two circular-cylindrical rollers, which roll on a subsoil in order to smooth it out. At least one of the rollers can be equipped with a vibrating unit to improve soil compaction.
- the aim of the invention is to create a compression vehicle with a hydraulic drive, with any configuration of hydraulic motors or first and second hydraulic machines being able to be implemented.
- a single pump or third hydraulic machine should be used in order to supply all hydraulic motors or first and second hydraulic machines with pressure fluid. Valves and the associated throttling losses in the primary energy transmission from the third hydraulic machine to the first and second hydraulic machines should be dispensed with as completely as possible.
- the at least one first, the at least one second and one third hydraulic machine are each connected to a common supply point on the high-pressure side and to a common tank on the low-pressure side, so that they form an open hydraulic circuit, with said connection to supply point can be continuously released in such a way that a high pressure in the at least one first, in the at least one second and in the third hydraulic machine is essentially equal to the pressure at the supply point, with the at least one first, the at least one second and the third hydraulic machine each have an adjustable displacement volume, wherein a displacement volume of the at least one second hydraulic machine can be adjusted in such a way that the desired vibration intensity results while the said connections to the supply point are released.
- the vibration unit preferably comprises at least one mass which can be rotated with respect to an axis of rotation and whose center of gravity is arranged away from said axis of rotation, the at least one mass being in rotary drive connection with an associated second hydraulic machine.
- a plurality of masses are preferably provided, the eccentricity and direction of rotation of which are matched to one another in such a way that the sum total is an oscillating acceleration force which is aligned essentially perpendicularly to the substrate.
- the vibration unit is preferably arranged inside the roll in question.
- a continuously releasable connection is to be understood on the one hand as a connection that is permanently open, it most preferably having a constant, small flow resistance.
- the continuously releasable connection can also be formed by a switching valve which has at least two discrete switching positions, the connection having a constant, small flow resistance in each switching position.
- a switching position that is designed as a locked position, so that the associated hydraulic machine is clamped hydraulically in a torque-proof manner.
- the direction of rotation of the associated hydraulic machine can be reversed with the switching valve, without the hydraulic machine having to be adjustable beyond the displacement volume of zero.
- the supply point is preferably a space filled with pressurized fluid, with essentially the same pressure prevailing in the entire space mentioned.
- the supply point is preferably formed by an elongated line.
- the supply point is preferably not small in the form of a point, rather it has a spatial extent.
- a hydraulic machine is to be understood as meaning a machine which converts hydraulic power into mechanical power in the form of a rotary movement and vice versa.
- the hydraulic machines mentioned are preferably axial piston machines.
- the at least one first and/or the at least one second hydraulic machine and the third hydraulic machine are preferably designed in a bent-axis design. This means that all hydraulic machines can be designed in such a way that they can be adjusted beyond the displacement volume of zero. For this reason, the bent-axis design that is otherwise preferred for hydraulic motors is not preferred.
- Said open hydraulic circuit is preferably operated with a liquid pressurized fluid, most preferably hydraulic oil being used.
- a direction of rotation of the at least one first hydraulic machine can be reversed by adjusting the displacement volume in question while the flow direction of the first hydraulic machine in question remains the same.
- the displacement volume of the at least one first hydraulic machine can therefore be adjusted beyond the zero displacement volume. This allows the direction of travel of the compaction vehicle to be reversed while the vibratory drive continues to run unchanged.
- the back and forth driving of the compaction vehicle which is often encountered when compacting a road surface, with the vibration unit continuing to run constantly, can therefore be carried out without any problems. Changing the direction of travel can be done very gently.
- the direction of rotation of the at least one second hydraulic machine can also be reversed by adjusting the displacement volume. Depending on the design of the vibration unit, different vibration properties can be achieved in this way.
- the pressure at the supply point maintains an essentially constant predetermined value.
- This predetermined value can change if the desired operating state changes, so it is only temporarily constant as long as the desired operating state does not change.
- this pressure value is preferably set by adjusting the displacement volume of the third hydraulic machine.
- this regulation reacts comparatively sluggishly when the pressure at the supply point changes abruptly due to rapidly changing external loads on the at least one first or the at least one second hydraulic machine.
- the filling and discharging speed of the hydraulic accumulator is preferably set in each case in such a way that the entire compaction vehicle has an optimally low energy consumption.
- a valve unit can be assigned to the hydraulic accumulator, which valve unit controls the exchange of pressurized fluid between the supply point and the hydraulic accumulator depending on the pressure at the supply point. This is intended in particular to prevent the hydraulic accumulator from being excessively filled. Next should prevent an empty hydraulic accumulator from interfering with the function of the hydraulic drive.
- Two or more rollers can be provided, each of which is in rotary drive connection with its own first hydraulic machine, with all of the first and all of the second hydraulic machines being connected to the same supply point and the same tank.
- a separate first hydraulic machine is preferably assigned to each roller.
- Each roller is preferably assigned its own vibration unit with its own second hydraulic machine.
- the present invention is particularly useful since, compared to a conventional compression vehicle, a particularly large number of pumps or third hydraulic machines can be dispensed with.
- the corresponding relationship is preferably stored in a characteristic map.
- the adjustment preferably takes place in the form of a control or a pilot control. This means that expensive controllers can be dispensed with.
- the positioning accuracy that can be achieved is often sufficient for a vibration unit.
- a pressure control working with a hydraulic pressure regulator at this point, since this has proven itself and works very reliably.
- the hydraulic pressure control also copes well with the strong pressure fluctuations that are often encountered in a hydraulic drive.
- Electronic pressure control is nevertheless preferred within the scope of the present invention, even though a high level of computing power has to be installed in the control device in order to achieve a control quality that is comparable to conventional hydraulic pressure control.
- the setpoint of this control should be very flexible to the current working conditions of the Compaction vehicle to be adjusted.
- the proposed pressure sensor can be used when adjusting the at least one first and the at least one second hydraulic machine, this representing a preferred embodiment of the invention.
- the single pressure sensor can therefore be used for three different purposes.
- a first control circuit can be provided, the actual variable of which is the pressure measured with the pressure sensor, the manipulated variable of which is the displacement volume of the third hydraulic machine.
- the pressure at the supply point is adjusted to a value specified by a target variable.
- the pressure mentioned is therefore no longer dependent on the driving resistance that the compaction vehicle has to overcome when driving. It is likewise not dependent on the set vibration strength or on the drive torque of the at least one second hydraulic machine.
- the corresponding setpoint variable is preferably selected in such a way that the desired speed can be achieved at the at least one first hydraulic machine, with the stated speed determining the driving speed of the compression vehicle.
- the aim is to keep the pressure at the supply point as low as possible in order to save energy.
- the speed of the at least one first hydraulic machine is preferably measured at least indirectly with a first speed sensor. It should be noted here that all rollers typically rotate at the same peripheral speed, which is equal to the travel speed of the compactor vehicle. Accordingly, a single first speed sensor is normally sufficient. If slippage on the rolls is to be feared, a plurality of first speed sensors are preferably used in order to detect this slippage.
- the rotational speed of the third hydraulic machine is preferably measured with a third rotational speed sensor, the corresponding measured value being taken into account in the regulation mentioned, in particular in determining the setpoint of the first control loop.
- a target value of the first control circuit depends on the desired driving speed of the Compaction vehicle and / or is selected depending on the desired vibration level.
- the driving speed for example, the drive torque of the rollers can be determined, which is necessary to reach the driving speed.
- the minimum required pressure at the supply point results from the maximum displacement volume of the first hydraulic machine. The same can be done with regard to the vibration intensity. The highest of the pressures determined in this way is decisive for determining the target value.
- the setpoint variable of the first control loop is preferably set in the form of a control, ie without feedback.
- This allows the vibration strength to be adjusted very precisely.
- the intensity of the vibrations essentially does not fluctuate on changing surfaces with different damping characteristics.
- the target variable of the second control circuit corresponds to the speed desired at the second hydraulic motor in question. This in turn is proportional to the desired vibration intensity.
- the second control loop is preferably combined with the characteristics map explained further above, which then works as a so-called pilot control.
- the supply point can be formed by a line which extends over at least 50% of the length of the compaction vehicle in the direction of travel. This means that all hydraulic machines of the compaction vehicle can be connected to the supply point without any problems. It goes without saying that the free cross-sectional area of the named line is preferably selected to be large enough that essentially the same pressure prevails at all points in the line.
- Said adjusting device preferably works hydraulically. It preferably includes an actuating cylinder, an actuating valve and a position sensor. Preferably, it includes a fourth control circuit, which regulates the displacement volume to a desired value specified by the control signal using the aforementioned components.
- FIG. 1 shows a roughly schematic side view of a compaction vehicle according to the invention
- FIG. 2 shows a circuit diagram of the hydraulic drive of the compression vehicle according to FIG. 1;
- FIG. 3 shows the activation control of the second hydraulic machine missing in FIG. 2; and 4 shows an alternative connection of the second hydraulic machine to the supply point and the tank.
- FIG. 1 shows a roughly schematic side view of a compaction vehicle 10 according to the invention.
- the present compaction vehicle 10 is designed in the form of a road roller, with which a subsurface 11 in the form of a freshly asphalted road can be rolled smooth.
- the compaction vehicle 10 has two rotatable, circular-cylindrical rollers 20 which roll on the subsoil in order to smooth it.
- the front roller 20 is driven by a first hydraulic machine 21 .
- FIG. 1 shows an extremely simple embodiment of an inventive
- Compaction vehicle shows.
- the present invention saves a particularly large amount of costs when many first and second hydraulic machines 21 ; 31 find use, for example, when all rollers 20 are driven and provided with a vibration unit 30 at the same time.
- the compaction vehicle can also have more than two rollers 20 .
- a vibration unit 30 Only the rear roller 20 is provided with a vibration unit 30 here.
- a pulsating force acting perpendicularly to the subsoil 11 is to be exerted on the assigned roller 20, so that the subsoil 11 is better compacted.
- a rotatably mounted mass 33 can be used for this purpose, for example, the center of gravity of which is arranged off the axis of rotation or eccentrically. This mass 33 is in rotary drive connection with an associated second hydraulic machine 31 .
- FIG. 2 shows a circuit diagram of the hydraulic drive of the compression vehicle 10 according to FIG. 1.
- the hydraulic drive comprises a supply point 50 in the form of an elongated line 54.
- the first, the second and the third hydraulic machine 21; 31; 41 connected to its high pressure side, with a there is a permanently open, low-resistance fluid exchange connection. No valves, throttles or the like are installed in this connection, so that the high pressure in the hydraulic machines 21; 31 ; 41 is substantially equal to the pressure at the supply point 50.
- the first, the second and the third hydraulic machine 21; 31; 41 are each designed as axial piston machines with adjustable displacement volume.
- the first and the second axial piston machine 21; 31 are preferably designed in a swash plate design, whereby they are operated as a motor during most of the operating time. They are preferably adjustable beyond the displacement volume of zero.
- the third hydraulic machine 41 is preferably designed in the form of a swash plate, with it being operated as a pump most of the time. All hydraulic machines 21; 31 ; 41 are equipped with an adjusting device 13, which is set up in such a way that the displacement volume of the relevant hydraulic machine 21; 31; 41 is adjusted essentially proportionally to an associated control signal 14 . Accordingly, there is no hydraulic pressure and/or power control on the hydraulic machine 21; 31; 41 itself instead. Instead, the hydraulic drive is controlled as described below, with electronic control devices preferably being used.
- the third hydraulic machine 41 is rotated by an associated drive motor 43 .
- the drive motor 43 is preferably a diesel engine, but any other type of motor, in particular an electric motor, can be used.
- the drive motor 43 preferably runs with a fixed direction of rotation.
- the third hydraulic machine 41 delivers pressurized fluid from the tank 12 to the supply point 50, working as a pump.
- pressure fluid flows from the supply point 50 via the third hydraulic machine 41 to the tank, with the third hydraulic machine 41 working as a motor and thus temporarily relieving the drive motor 43 .
- the low-pressure sides of the first, second and third hydraulic machines 21 ; 31 ; 41 are each connected to the tank 12, resulting in an open hydraulic circuit. These connections to the tank are also open permanently and with little resistance, with preferably no valves, throttles or the like being arranged there. So the whole hydraulic drive comes basically without any valves, the desired movement being achieved solely by adjusting the stroke volumes of the hydraulic machines 21; 31; 41 is brought about.
- the supply point 50 is assigned a valve unit 52 which is connected between the supply point 50 and an optional hydraulic accumulator 51 .
- the hydraulic accumulator 51 intercepts peaks in the power requirement, for example when accelerating the vibration drive (no. 30 in FIG. 1), so that they do not overload the drive motor 43 so that it does not have to be designed to be excessively large. Furthermore, pressure peaks at the supply point 50 are intercepted by the hydraulic accumulator 51 .
- the valve unit 52 initially brings about an adjustment of a high pressure in the hydraulic accumulator 51 to a lower pressure at the supply point 50, so that the hydraulic accumulator 51 is discharged when it is sufficiently filled.
- the valve unit 52 can be purely hydro-mechanical. It is preferably electrically adjustable, being adjusted by the electronic control device 16 .
- the hydraulic accumulator 51 is preferably provided with a pressure sensor (not shown), which is connected to the electronic control device 16 so that the pressure in the hydraulic accumulator 51 can be regulated electronically.
- first control circuit 60 With the first control circuit 60, a pressure is adjusted at the supply point 50, which is equal to the desired variable 63 of the first control circuit 60.
- This target variable 63 is selected as a function of the desired driving speed of the compaction vehicle and the desired vibration intensity of the vibration drive (no. 30 in FIG. 1).
- setpoint value 63 of first control circuit 60 is preferably selected to be so small that the adjustment range of first and second hydraulic machine 21; 31 is just about sufficient to achieve the desired operating parameters (travel speed, vibration intensity).
- the corresponding first controller 64 is designed as a PID controller, in which case a PI or an I controller can also be used.
- the first controller 64 is preferably implemented by an electronic controller 16 that includes a programmable digital computer.
- the first controller 64 is the Difference between the setpoint variable 63 explained above and the actual variable 61 is supplied, with a manipulated variable 62 being present at its output, which forms the manipulated variable 14 of the third hydraulic machine 41 .
- the actual variable 61 of the first control loop 60 is the measured value of a pressure sensor 53 which is connected to the supply point 50 .
- FIG. 3 shows the control of the second hydraulic machine 31 that is missing in FIG. 2.
- FIGS. 2 and 3 together show a uniform hydraulic drive. 3 shows the most complex variant of the control, in which a pilot control is carried out by means of a characteristics map 80, with the pilot control being superimposed on a regulation with the second control circuit 70.
- a pilot control is carried out by means of a characteristics map 80, with the pilot control being superimposed on a regulation with the second control circuit 70.
- the pilot control alone, without the second control loop 70 results in sufficiently good system behavior.
- the second control circuit 70 alone, without the pilot control results in sufficiently good system behavior.
- the second control circuit 70 includes a second controller 74, which is designed here as a PID controller, although it can also be designed as a PI or I controller.
- the difference between the actual variable 71 and the setpoint variable 73 is fed to its input.
- Actual variable 71 is formed from the measured value of second speed sensor 32 , ie from the speed of second hydraulic machine 31 .
- Setpoint variable 73 corresponds to the rotational speed of second hydraulic machine 31, with which desired vibration strength 81 is achieved.
- this control basically has an integral control behavior, in which case it subsequently reacts comparatively sluggishly to changes in setpoint variable 73 . This problem can be remedied with the pilot control.
- the pilot control includes a characteristic map 80, which has the desired vibration intensity 81 and the measured value of the pressure sensor 53, ie the pressure at the supply point, as input variables.
- the characteristic map 80 gives the displacement volume to be set on the second hydraulic machine 31 as an output variable, with which the desired vibration intensity 81 is achieved at the current pressure at the supply point.
- Characteristic map 80 preferably includes a corresponding table of values, from which intermediate values are most preferably obtained by interpolation. This pre-control does not take into account, for example, that Changing ambient temperatures also affect the required setting of the second hydraulic machine 31.
- the second control circuit 70 counteracts this problem.
- the output variables of characteristics map 80 and of second controller 74 are added, resulting in control signal 14 for second hydraulic machine 31 .
- FIG. 4 shows an alternative connection of the second hydraulic machine 31 to the supply point 50 and the tank 12. In the embodiment according to FIG. 2, these connections were permanently open.
- the embodiment according to FIG. 4 is intended for cases in which the direction of rotation of the second hydraulic machine 31 is to be reversible, in which case no hydraulic machine adjustable beyond the displacement volume of zero is to be used in order to save costs.
- the second hydraulic machine 31 is therefore connected to a switching valve 34, which is designed as a 4/3-way valve.
- the switching valve 43 therefore has four connections and three switching positions.
- the switch positions are discrete switch positions, with essentially no intermediate positions in which the opening cross sections of the various connections change constantly.
- the middle position is a locked position in which the second hydraulic machine 31 in question cannot move because it is hydraulically clamped.
- the connections to the tank 12 and the supply point 50 are blocked.
- the second hydraulic machine rotates, for example, to the right, while in the right-hand position of the switching valve 34 in FIG. 4 it rotates to the left.
- the displacement volume is preferably set to zero or almost zero on the second hydraulic machine 31, while the switching valve 34 is adjusted.
- the connections between the second hydraulic motor 31 and the tank 12 or the supply point 50 are continuously released.
- a continuous adjustment of the corresponding opening cross sections preferably does not take place while the vibration unit (No. 30 in FIG. 1) is running.
- the first hydraulic machine (number 21 in FIG. 2) can be connected to the supply point 50 and the tank 12 in an analogous manner with an analog switching valve.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021200285.4A DE102021200285A1 (de) | 2021-01-14 | 2021-01-14 | Verdichtungsfahrzeug, bei welchem ein Fahrantrieb und eine Vibrationseinheit von einer gemeinsamen Versorgungstelle her mit Druckfluid versorgt werden |
| PCT/EP2022/050103 WO2022152596A1 (de) | 2021-01-14 | 2022-01-05 | Verdichtungsfahrzeug, bei welchem ein Fahrantrieb und eine Vibrationseinheit von einer gemeinsamen Versorgungstelle her mit Druckfluid versorgt werden |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4278044A1 true EP4278044A1 (de) | 2023-11-22 |
| EP4278044B1 EP4278044B1 (de) | 2025-05-21 |
Family
ID=79731040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22700286.2A Active EP4278044B1 (de) | 2021-01-14 | 2022-01-05 | Verdichtungsfahrzeug, bei welchem ein fahrantrieb und eine vibrationseinheit von einer gemeinsamen versorgungstelle her mit druckfluid versorgt werden |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4278044B1 (de) |
| DE (1) | DE102021200285A1 (de) |
| WO (1) | WO2022152596A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022209497B4 (de) | 2022-09-12 | 2025-10-30 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zur Steuerung eines hydrostatischen Antriebs |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10210049B4 (de) | 2002-03-07 | 2004-03-25 | Abg Allgemeine Baumaschinen-Gesellschaft Mbh | Verdichtungswalze |
| US8374766B2 (en) * | 2007-11-29 | 2013-02-12 | Caterpillar Paving Products Inc. | Power management system for compaction vehicles and method |
| US20110158745A1 (en) | 2009-12-31 | 2011-06-30 | Caterpillar Paving Products Inc. | Vibratory system for a compactor |
| DE102010006993A1 (de) * | 2010-02-05 | 2011-08-11 | Robert Bosch GmbH, 70469 | Vibrationsantrieb |
| DE102013227007B4 (de) * | 2013-12-20 | 2024-05-16 | Hamm Ag | Selbstfahrende Baumaschine, insbesondere Bodenverdichter |
| US20170121917A1 (en) * | 2015-10-30 | 2017-05-04 | Caterpillar Paving Products Inc. | Compaction System and Method for Determining Roller Decoupling |
| CN110621825B (zh) | 2017-06-07 | 2022-09-06 | 沃尔沃建筑设备公司 | 用于工程机械的液压系统 |
| JP6749351B2 (ja) * | 2018-01-19 | 2020-09-02 | 酒井重工業株式会社 | 建設車両 |
-
2021
- 2021-01-14 DE DE102021200285.4A patent/DE102021200285A1/de not_active Withdrawn
-
2022
- 2022-01-05 WO PCT/EP2022/050103 patent/WO2022152596A1/de not_active Ceased
- 2022-01-05 EP EP22700286.2A patent/EP4278044B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP4278044B1 (de) | 2025-05-21 |
| DE102021200285A1 (de) | 2022-07-14 |
| WO2022152596A1 (de) | 2022-07-21 |
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