IMPROVED HYDRAULIC SYSTEM FOR VIBRATION GENERATION

Description

Technical Field

[0001] The present invention relates to a hydraulic circuit for an electric compactor. Previous technique

[0002] The generation of vibration in a machine or device such as an electric compactor responds to specific constraints, which lead to the creation of dedicated circuits.

[0003] Conventional circuits for vibration generation commonly employ a hydraulic pump supplying one or more hydraulic motors to drive one or more eccentric rotating masses forming an imbalance, via an on / off selector.

[0004] It is important to achieve rapid start-up and stopping of the vibrating masses so that the number of cycles per unit length traveled is as constant as possible over the compactor's working length, in order to avoid deforming the surface being compacted. It is also important to achieve the operating frequencies for which the machine is designed, particularly with regard to the masses of the vibrating sub-assemblies and the stiffness of the assembly elements, in order to avoid unwanted resonance phenomena in the machine's structure.

[0005] Conventional circuits have complex structures using a multitude of components, which is detrimental in terms of cost, mass, size, energy efficiency and autonomy.

[0006] Document US2021047790 presents an example of a known system designed to improve the retention effect of a compactor, particularly on downhill slopes. This document proposes actuating the rotating masses either intermittently or alternately in both directions of rotation to generate additional inertia and create a braking effect. However, it is understood that operating the rotating masses in this manner over a working length is not acceptable due to the resulting deformations in the ground on a construction site.

[0007] The present invention thus aims to address at least partially these problems. Description of the invention

[0008] The present invention thus proposes a system for driving a compactor, comprising: a primary pump, suitable for supplying a primary hydraulic circuit, a secondary pump, suitable for supplying a secondary hydraulic circuit, an electric motor, suitable for jointly driving the primary and secondary pumps in rotation, in which The primary pump and the secondary pump are variable displacement hydraulic pumps, the primary hydraulic circuit is adapted to perform a rotation of moving parts of the compactor, said moving parts comprising at least one roller, the primary pump being a variable displacement hydraulic pump, the secondary hydraulic circuit is adapted to perform a rotation of vibrating parts adapted to generate vibrations, the secondary pump being a variable displacement hydraulic pump, the system includes a controller, adapted to drive the primary motor so as to provide sufficient torque to drive the primary and secondary pumps.

[0009] For example, the primary hydraulic circuit is a closed loop circuit, the secondary hydraulic circuit is a closed loop circuit.

[0010] According to one example, the secondary hydraulic circuit includes a calibrated relief device, adapted to achieve a pressure relief from a line of the secondary hydraulic circuit to a line of the secondary hydraulic circuit having a lower pressure or to a reservoir, said calibration device being conducting when the pressure is greater than or equal to a calibration pressure, and in which the controller is configured to drive the primary motor and secondary pump so that the pressure in the secondary circuit remains below the calibration pressure.

[0011] In one example, the controller is configured to drive the primary motor and secondary pump so that the pressure in the secondary circuit remains below the set pressure while maintaining a constant travel speed of the compactor.

[0012] In one example, the controller is configured to drive the primary motor, primary pump and secondary pump so that the vibrating elements are driven in the same direction of rotation as the moving parts, typically continuously.

[0013] In one example, the controller is configured to control the rotational speed of the primary motor, the displacement of the primary pump, and the displacement of the secondary pump.

[0014] According to the invention, the system further comprises a feed pump adapted to supply a feed circuit, the primary motor being adapted to drive the feed pump in rotation jointly with the primary pump and the secondary pump.

[0015] The system then includes a braking element disposed at a discharge of the lift pump, the braking element being adapted to be passing or to define a restriction at the discharge of the lift pump, so as to generate a resisting torque on a shaft of the primary motor driving in rotation the lift pump, the primary pump and the secondary pump.

[0016] According to one example, the braking device is a flow limiter with a fixed setting defining a flow rate beyond which it is open, said setting being set to a value greater than a pressure value corresponding to nominal system operation.

[0017] According to the invention, the system also includes a current storage element adapted to power the primary motor, in which the controller is configured to determine a state of charge of the current storage element, and to condition the actuation of the braking element on the detection of a state of charge of the current storage element greater than a predetermined threshold value.

[0018] The present invention also relates to a method for controlling a system comprising a primary hydraulic circuit adapted to drive in rotation the movement components of a compactor comprising at least one roller, said primary hydraulic circuit comprising a variable displacement hydraulic primary pump, a secondary hydraulic circuit adapted to drive in rotation vibrating elements to generate vibrations, said secondary hydraulic circuit comprising a variable displacement hydraulic secondary pump, an electric primary motor, adapted to jointly drive in rotation the primary pump and the secondary pump, said method being characterized in that the primary motor is driven so as to provide sufficient torque to jointly drive the primary pump and the secondary pump in rotation.

[0019] For example, the rotational speed of the primary motor, the displacement of the primary pump and the displacement of the secondary pump are controlled.

[0020] According to one example, the primary motor is controlled so that the pressure in the secondary hydraulic circuit remains below a set pressure of a relief device, said relief device being adapted to be open and to create a flow leak when the pressure in the secondary hydraulic circuit is greater than said set pressure.

[0021] According to the invention, the primary motor is also driven so as to drive in rotation a feed pump of a feed circuit jointly with the primary pump and the secondary pump.

[0022] According to the invention, a braking element is provided at the discharge of the fuel pump, so as to selectively generate a resisting torque on the primary motor.

[0023] According to one example, the braking device is a flow limiter having a fixed setting defining a flow rate beyond which it is open, and in which said setting is established at a value greater than a pressure value corresponding to a nominal operation of the system.

[0024] According to the invention, the primary motor is connected to a current storage unit adapted to supply the primary motor, and in which the controller determines a state of charge of the current storage unit, and conditions the actuation of the braking unit on the detection of a state of charge of the current storage unit greater than a predetermined threshold value. Brief description of the drawings

[0025] The invention and its advantages will be better understood upon reading the detailed description below of various embodiments of the invention given by way of non-limiting examples. [ Fig. 1 ] There figure 1 is a schematic representation of a system according to one aspect of the invention. Fig. 2 ] There figure 2 is a more detailed representation of the figure 1 . [ Fig. 3 ] There figure 3 is a graph that represents the evolution of circuit parameters during its use.

[0026] Across all figures, common elements are identified by identical numerical references. Description of the implementation methods

[0027] The figures show an example of a system according to one aspect of the invention.

[0028] This is illustrated schematically on the figures 1 And 2 two representations of a system according to one aspect of the invention.

[0029] The system as represented includes a traction circuit or primary circuit 100, a vibration circuit or secondary circuit 200 and an optional feeding circuit 300.

[0030] The primary circuit 100 includes a primary pump 110 adapted to power one or more hydraulic motors adapted to drive the rotation of moving parts of a compactor. The primary pump 110 is a variable displacement hydraulic pump. In the example illustrated on the figure 2 The hydraulic pump 110 is connected to two hydraulic motors 120 and 130, adapted to drive the rotation of moving parts of a vehicle or machine, 125 and 135 respectively, for example, balls or rollers. The nature of the moving parts varies depending on the type of machine, particularly whether it is a simple compactor, with a single roller and an axle equipped with wheels, or a tandem compactor with two rollers. The primary circuit 100, as shown, is a closed-loop hydraulic circuit.

[0031] The secondary circuit 200 includes a secondary pump 210 connected to two hydraulic motors 220 and 230 adapted to drive rotating components designed to generate vibrations, for example, eccentric masses. The secondary pump 210 is a variable displacement hydraulic pump.

[0032] In the illustrated example, the secondary circuit 200 comprises two hydraulic motors, 220 and 230, adapted to drive the rotation of two vibrating elements, 225 and 235 respectively, which typically corresponds to a tandem roller compactor with two rollers. It is understood that in the case of a compactor with a single roller, the secondary circuit 200 may then consist of only a single hydraulic motor driving the rotation of a single vibrating element.

[0033] In the illustrated example, a bypass valve 240 is mounted in parallel with the hydraulic motor 230, which allows either both hydraulic motors 220 and 230 to be activated, or only the hydraulic motor 220. The bypass valve 240 is typically an electrically operated valve.

[0034] The secondary circuit 200 as illustrated is a closed-loop hydraulic circuit.

[0035] The system includes an electric primary motor M. The primary motor M has a drive shaft 10 adapted to jointly drive the primary pump 110 and the secondary pump 210. The two pumps 110 and 210 are, for example, coupled to the same shaft 10 of the primary motor M. In the figures, for clarity, the shaft 10 is shown partially, i.e., interrupted along its length. The primary motor M is coupled to a current storage device 450, such as a battery.

[0036] The primary pump 110 can, for example, be a through-shaft pump, allowing coupling with the secondary pump 210. Alternatively, each pump may include a shaft segment and a connection between the primary pump 110 and the secondary pump 210, such as a concentric shaft joint with splines, a flat coupling, a universal joint, or an Oldham joint. Alternatively, the primary motor M can be connected to the primary pump 110 and the secondary pump 210 via a parallel connection, for example, with a belt, chain, or gear drive, enabling joint drive by the primary motor M.

[0037] Thus, in operation, the primary motor M will drive in rotation both the primary pump 110 and the secondary pump 210, so as to allow these two hydraulic pumps to deliver a flow to supply respectively the primary circuit 100 and the secondary circuit 200.

[0038] The system as proposed is also reversible, and allows for an energy recovery function when the secondary circuit 200 is stopped, as explained below.

[0039] Advantageously, the primary motor M can operate as a generator when the secondary circuit 200 is stopped. When it is desired to stop the secondary circuit 200, the primary motor M is controlled to provide a resisting torque. The vibrating elements 225 and 235 will temporarily continue to rotate due to their inertia. They will thus drive the hydraulic motors 220 and 230, which will then operate as hydraulic pumps and generate a flow. This flow will supply the secondary pump 210, which will then operate as a hydraulic motor and drive the shaft 10 of the primary motor M, which will then perform the function of an electric generator, charging a current storage device 450, for example, an electrical accumulator such as a battery. Thus, all or part of the energy of the vibrating elements is recovered during braking.

[0040] The system as proposed also includes a controller 20, typically a computer or electronic control unit commonly referred to by the acronym ECU in English.

[0041] The controller 20 is designed to drive the primary motor M to provide sufficient torque to drive the primary pump 110 and the secondary pump 210, thereby achieving the desired performance in terms of speed and vibration. Generally, the electric primary motor M is driven to provide sufficient torque to simultaneously rotate the primary pump 110 and the secondary pump 210. To do this, the controller 20 sums the required displacement and speed of the primary pump 110 and the secondary pump 210. For example, knowing the speed requirements of the motors 120, 130, 220, and 230, and therefore the flow requirements in the primary circuit 100 and the secondary circuit 200, the controller 20 determines the displacement of the primary pump 110 and the secondary pump 210, as well as the speed of the motor M.In this way it controls the motor M to provide a power equal to the sum of the powers required for the primary 100 and secondary 200 circuits.

[0042] The control performed by the controller 20 is typically carried out according to information and instructions applied by a user, including the desired speed of movement and the desired vibration frequency.

[0043] Such a system offers significant advantages in terms of cost, size, and weight compared to systems requiring a separate motor to drive each pump. By using a single electric motor for at least two pumps with different drive requirements, it reduces costs by decreasing the number of electric motors and their drivers, and it also allows for a very compact installation if the pumps are coupled as close together as possible.

[0044] During operation, the primary motor M drives the primary pump 110 and the secondary pump 210. Modulating the displacement of the hydraulic pumps 110 and 210, typically by the controller 20, allows the flow rate delivered in the primary circuit 100 and the secondary circuit 200 to be varied. Alternatively, the primary pump 110 is a manually operated pump. A displacement sensor then provides a displacement value to the controller 20 so that it can control the secondary pump 210 based, in particular, on the displacement and direction of rotation of the primary pump 110. Alternatively, a control law for the secondary pump 210 allows the displacement obtained to be determined with sufficient precision as a function of the setpoint applied to the control of the secondary pump 210. For example, a position sensor on a control lever operated by the user can then be used to determine the displacement.A proportional electrical control can also be used, with the pump control inputs communicated to the controller 20. The secondary circuit 200 can, for example, be actuated beyond a threshold value of the speed of movement of the moving parts.

[0045] The system typically includes a 300 feed circuit. The 300 feed circuit as shown in the figures includes a 310 feed pump adapted to deliver a feed flow rate.

[0046] Optionally, the feed pump 310 can be coupled to the shaft 10 of the primary motor M or via belts, a chain or gears so as to be driven in rotation jointly with the primary pump 110 and the secondary pump 210, in the same way as the drive between the primary pump 100 and the secondary pump 210, or the feed pump 310 can be driven in rotation by another source, for example by another motor.

[0047] The 300 fuel supply circuit typically includes components adapted, in particular, to draw a pilot pressure enabling the control of various hydraulic components, and to define a fuel supply pressure. These components are generally designated by the numerical reference 315; the details of these components are not the subject of the invention.

[0048] The 300 feed circuit is connected to the primary circuit 100 and the secondary circuit 200 via safety blocks, respectively 150 and 250.

[0049] Each safety block 150 and 250 performs a function of overpressure protection and priming of the associated hydraulic circuit, and optionally a function of purging the associated hydraulic circuit. Thus, for safety block 150, a priming device 152 and a discharge device 154 are defined, and for safety block 250, a priming device 252 and a discharge device 254. Each priming device 152 and 252 typically includes one or more check valves and calibrated relief valves forming a pressure limiter adapted to prime the inlet of the associated hydraulic pump 110 or 210, as well as overpressure protection.

[0050] Each safety block 150 and 250 ensures a minimum pressure in the primary circuit 100 and the secondary circuit 200 via the feed valves 152 and 252 as soon as the feed pump 310 is activated, and releases pressure when the pressure in either of these circuits (primary 100 or secondary 200) exceeds a set value via the relief valves 154 and 254. For example, the relief valve 154 associated with the primary circuit 100 can be calibrated to a pressure of approximately 350 bar, and the relief valve 254 associated with the secondary circuit 200 can be calibrated to a pressure of approximately 210 bar. These pressures depend on the components chosen for each circuit, primary or secondary.

[0051] Each relief device 154 and 254 typically includes a valve or calibrated valve, configured to release fluid when the pressure in one of the lines of the associated circuit exceeds the set pressure threshold. This fluid release can, for example, be directed from a high-pressure line of the circuit to a low-pressure line of the circuit, or to the reservoir R. The set pressure of each relief device 154 and 254 is typically defined according to the permissible pressures of the various components of the primary 100 and secondary 200 hydraulic circuits, in particular according to the maximum permissible pressures of the hydraulic motors 120, 130, 220, and 230.

[0052] Optionally, the primary motor M and the secondary pump 210 can be controlled, typically via the controller 20, so that the pressure in the secondary circuit 200 remains below the set pressure of the discharge device, whether during system start-up, operation or shutdown.

[0053] Such control makes it possible to avoid losses, particularly during the commissioning and shutdown of the secondary circuit 200, which could result from overpressure in the secondary circuit and heating of the fluid in the secondary circuit 200.

[0054] As an example, controller 20 manages the speed of motor M and the displacement of primary pump 110 and secondary pump 210 to achieve accelerations that do not exceed a limit. Specifically, controller 20 can manage the machine's start-up, which includes acceleration of the traction combined with acceleration of the vibrating elements. It can also generate the controlled acceleration of the vibrating elements while maintaining a constant forward speed. To achieve this, controller 20 determines at any given moment an operating point for the primary motor M that provides the necessary power, pressure, and flow rate to drive the primary pump 110 and the secondary pump 210, and optionally, to drive the feed pump. If necessary, the primary motor M can be accelerated.The controller 20 adjusts the displacement of the primary pump 110 and the secondary pump 210 accordingly, for example, to maintain a constant forward speed and the desired vibration acceleration. Generally, the controller 20 can adjust the speed of the primary motor M and the displacements of the primary pump 110 and the secondary pump 210 according to the pressure and flow requirements of each circuit 100, 200, 300.

[0055] Alternatively, for a simple and economical embodiment, the primary pump 110 is a manually controlled hydraulic pump. In this way, a user can manually adjust the forward speed of a compactor, which remains constant during operation. Specifically, the controller 20 sets the speed of the primary motor M to a fixed value, thus ensuring a constant forward speed. The controller 20 then adjusts the displacement of the secondary pump 210 to achieve the desired vibration acceleration.

[0056] There figure 3presents several curves which illustrate the evolution of different parameters as a function of such control which maintains a pressure in the secondary circuit 200 lower than the set pressure of the discharge member 254 via a control of the rotation speed of the primary motor M and the displacement of the secondary pump 210, it being understood that these curves are also transposed for the control of the primary circuit 100.

[0057] This figure represents an evolution of the acceleration A of the primary motor M as a function of time t, an evolution of the rotational speed V of the primary motor M as a function of time t, and an evolution of the pressure P within the vibration circuit 200 as a function of time t in the high-pressure pipe of the vibration circuit 200.

[0058] Time t1 designates the sending of a command to activate the vibration circuit 200. At this time, the primary motor M is set to rotate to reach a target speed Vc. The acceleration of the primary motor M is typically constant and equal to a maximum permissible acceleration value Amax, which maintains a pressure P in the high-pressure line of the hydraulic circuit strictly lower than the set pressure Pt of the relief valve 254. The rotational speed V of the primary motor M2 then increases steadily, along a constant slope. When the target speed Vc is reached, the acceleration becomes zero. The speed is maintained at the target speed Vc, and the pressure in the circuit settles at a substantially constant value, maintaining the rotational speed while compensating for various pressure losses and friction.

[0059] Time t3 designates the sending of a command to stop the vibration circuit 200. The system then aims to bring the speed to zero as quickly as possible. The primary motor M is therefore braked, with a constant deceleration equal to a maximum permissible deceleration value, for example -Amax. This maximum permissible deceleration value is sized so that the pressure in the high-pressure line of the vibration circuit 200 remains below the set pressure Pt of the discharge device 254. Note here that the low-pressure and high-pressure lines are reversed between the acceleration and deceleration phases. The rotational speed of the primary motor M then decreases regularly, along a constant slope, until it stops at time t4.

[0060] Optionally, the controller 20 can control the motor M taking into account the power and speed requirements of the feed pump 300, while also taking into account the requirements of the primary pumps 110 and secondary pumps 210. For example, if during certain phases the need for feed increases, for example during acceleration and pressure rise phases, then the primary motor M can be accelerated to increase the feed flow, while adjusting the displacement of the primary pumps 110 and secondary pumps 210 to maintain the required speeds.

[0061] Optionally, the controller 20 is configured to drive the primary motor M, the primary pump 110, and the secondary pump 210 so that the vibrating elements are driven in the same direction of rotation as the moving parts. This is because the vibrating elements are often supported by a rotation shaft with bearings, which are themselves supported by the inside of the roller. In this way, the relative speed of the bearings is reduced, which decreases friction and losses in the vibrating mass bearings. Furthermore, the force exerted by driving the vibrating masses contributes to driving the compactor roller, thus improving its start-up. This also reduces bearing wear. This contributes to energy savings and increases the machine's operating time. This embodiment can be applied by the controller 20, in particular, in a system operating configuration with a vibration requirement.

[0062] In the case of a simplified circuit with manual control of the primary pump 110, a direction of advance sensor allows the controller 20 to know the direction of rotation.

[0063] The displacement of the primary pump 110 and / or the displacement of the secondary pump 210 can thus be controlled, typically via the controller 20. In the invention, the system includes a braking element 330 located at a discharge of the feed pump 310. The braking element 330 is typically a valve adapted to be either open or to define a variable restriction at the discharge of the feed pump 310. Thus, the braking element 330 allows for the selective generation of a resisting torque on a shaft of the motor driving the feed pump 310, typically the primary motor M which also drives the primary pump 110 and the secondary pump 320 via the shaft 10. The braking element 330 is then typically controlled by the controller 20.The braking device 330 is typically a flow limiter with a fixed setting, strictly above a predetermined flow rate corresponding, for example, to the flow rate of normal or nominal use of the feed circuit 300. Thus, in the event of a malfunction during the braking of the vibrating elements or moving parts, inertia will tend to accelerate the hydraulic machines and the primary motor M, even though their displacements will have been reduced. This will lead to an increase in the flow rate delivered by the feed pump 310, which will then activate the flow limiter. Therefore, in such an embodiment, control of the braking device 330 by the controller is not required, as the activation threshold is defined by the sizing of the braking device 330.

[0064] The use of such a braking element 330 makes it possible, in particular, to apply braking torque, and thus to perform an energy dissipation function when storage devices such as batteries are already charged during braking and can therefore no longer provide engine braking. The controller 20 is therefore adapted to determine the state of charge of the current storage element 450, and to condition the actuation of the braking element 330 on the detection of a state of charge of the current storage element 450 exceeding a predetermined threshold value, typically greater than or equal to 90%, greater than or equal to 95%, or equal to 100%. Thus, when the current storage element 450 has a state of charge below this threshold value, the energy is dissipated by the primary motor M, which is driven in such a way as to restore energy and charge to the current storage element 450.When the current storage device 450 has a state of charge greater than or equal to the aforementioned threshold value, it can no longer be used to perform an energy dissipation function. The controller 20 then typically actuates the braking device 330.

[0065] The proposed system and method thus make it possible to optimize energy dissipation while maintaining an energy recovery and charging function of the 450 current storage unit. In addition, the proposed system and method make it possible to achieve continuous braking without using vibrating elements for the energy dissipation function which are likely to generate undesirable vibrations.

[0066] According to one example, for the simplest possible control, the braking element 330 can also be of the pressure-compensated flow limiter type, that is to say, it will act automatically when the flow threshold for which it is calibrated is exceeded, without intervention from the controller 20. In such an embodiment, it is therefore understood that the primary pump 110 is not necessarily controlled by the controller 20.

[0067] Although the present invention has been described with reference to specific embodiments, it is evident that modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the claims. In particular, individual features of the various embodiments illustrated / mentioned can be combined in additional embodiments. Therefore, the description and drawings should be considered in an illustrative rather than restrictive sense.

[0068] It is also evident that all the characteristics described with reference to a process are transposable, alone or in combination, to a device, and conversely, all the characteristics described with reference to a device are transposable, alone or in combination, to a process.

Claims

1. A system for driving a compactor, comprising: - a primary hydraulic circuit (100) adapted to perform a rotation of movement members (125, 135) of the compactor, said movement members (125, 135) comprising at least one roller, said primary hydraulic circuit comprising a primary pump (110) adapted to supply the primary hydraulic circuit (100), - a secondary hydraulic circuit (200) is adapted to perform a rotation of vibrating elements (225, 235) adapted to generate vibrations, the secondary hydraulic circuit (200) comprising a secondary pump (210) adapted to supply the secondary hydraulic circuit (200), - a primary motor (M) adapted to jointly drive in rotation the primary pump (110) and the secondary pump (210), wherein the primary pump (110) and the secondary pump (210) are variable displacement hydraulic pumps, the system comprises a controller (20), adapted to pilot the primary motor (M) so as to provide sufficient torque to drive the primary pump (110) and the secondary pump (210) characterized in that the primary motor is an electric motor and in that the system further comprises a booster pump (310) adapted to supply a booster circuit (300), the primary motor (M) being adapted to drive in rotation the booster pump (310) together with the primary pump (110) and the secondary pump (210), a braking member (330) disposed at a discharge of the booster pump (310), the braking member (330) being adapted to be in the on-state or to define a restriction at the discharge of the booster pump (310), so as to generate a resistive torque on a shaft (10) of the primary motor (M) driving in rotation the booster pump (310), the primary pump (110) and the secondary pump (210), a current storage member (450) adapted to supply the primary motor (M), wherein the controller (20) is configured so as to determine a state of charge of the current storage member (450), and to condition the actuation of the braking member (330) on the detection of a state of charge of the current storage member (450) greater than a predetermined threshold value.

2. The system according to claim 1, wherein the primary hydraulic circuit (100) is a closed-loop circuit, the secondary hydraulic circuit (200) is a closed-loop circuit.

3. The system according to any of claims 1 or 2, wherein the secondary hydraulic circuit (200) comprises a calibrated relief member (254), adapted to perform a pressure relief from a duct of the secondary hydraulic circuit (200) to a duct of the secondary hydraulic circuit (200) having a lower pressure or to a reservoir (R), said calibration member being in the on-state when the pressure is greater than or equal to a calibration pressure, and wherein the controller (20) is configured to pilot the primary motor (M) and the secondary pump (210) such that the pressure in the secondary circuit (200) remains lower than the calibration pressure.

4. The system according to claim 3, wherein the controller (20) is configured to pilot the primary motor (M) and the secondary pump (210) such that the pressure in the secondary circuit (200) remains lower than the calibration pressure while maintaining a constant movement speed of the compactor.

5. The system according to any of claims 1 to 4, wherein the controller (20) is configured to pilot the primary motor (M), the primary pump (110) and the secondary pump (210) such that the vibrating elements (225, 235) are driven in the same direction of rotation as the movement members (125, 135).

6. The system according to any of claims 1 to 5, wherein the controller (20) is configured to pilot the rotational speed of the primary motor (M), the displacement of the primary pump (110) and the displacement of the secondary pump (210).

7. The system according to any one of claims 1 to 6, wherein the braking member (330) is a flow rate limiter having a fixed adjustment defining a flow rate beyond which it is in the on-state, said adjustment being set to a value greater than a pressure value corresponding to nominal operation of the system.

8. A method for piloting a system comprising: - a primary hydraulic circuit (100) adapted to drive in rotation movement members (125, 135) of a compactor comprising at least one roller, said primary hydraulic circuit (100) comprising a variable displacement hydraulic primary pump (110), - a secondary hydraulic circuit (200) adapted to drive in rotation vibrating elements (225, 235) to generate vibrations, said secondary hydraulic circuit (200) comprising a variable displacement hydraulic secondary pump (210), - an electric primary motor (M), adapted to jointly drive in rotation the primary pump (110) and the secondary pump (210), said method being characterized in that the primary motor (M) is piloted so as to provide sufficient torque to jointly drive in rotation the primary pump (110) and the secondary pump (210), wherein the primary motor (M) is also piloted so as to drive in rotation a booster pump (310) of a booster circuit (300) jointly with the primary pump (110) and the secondary pump (210), wherein a braking member (330) is provided at the discharge of the booster pump (310), so as to selectively generate a resistive torque on the primary motor (M) wherein the primary motor (M) is connected to a current storage member (450) adapted to supply the primary motor (M), and wherein the controller (20) determines a state of charge of the current storage member (450), and conditions the actuation of the braking member (330) on the detection of a state of charge of the current storage member (450) greater than a predetermined threshold value.

9. The method according to claim 8, wherein the rotational speed of the primary motor (M), the displacement of the primary pump (110) and the displacement of the secondary pump (210) are piloted.

10. The method according to any of claims 8 or 9, wherein the primary motor (M) is piloted so that the pressure in the secondary hydraulic circuit (200) remains lower than a calibration pressure of a relief member (254), said relief member (254) being adapted to be in the on-state and to perform a pressure leak when the pressure in the secondary hydraulic circuit (200) is higher than said calibration pressure.

11. The method according to any one of claims 8 to 10, wherein the braking member (330) is a flow rate limiter having a fixed adjustment defining a flow rate beyond which it is in the on-state, and wherein said adjustment is set to a value greater than a pressure value corresponding to nominal operation of the system.