DE102022107441A1 - Team consisting of a battery-electric vehicle and a trailer with an overrun brake - Google Patents

Abstract

The invention relates to a combination (3) consisting of a battery-electric vehicle (1) and a trailer (2) with an overrun brake (4). In order to be able to use the kinetic energy of the trailer during recuperation, the trailer (2) has a controllable blocking device ( 6), which is coupled to the overrun brake (4) and which can be switched into a blocking state in which the blocking device (6) prevents the overrun brake (4) from functioning, and into a release state in which the blocking device (6). Function of the overrun brake (4) releases. A vehicle control (7) determines and/or receives information about the recuperation behavior of the vehicle (1) and about danger and safety parameters. A trailer control (8) for controlling the blocking device (6) is coupled to the blocking device (6) and to the vehicle control (7) and is configured so that it controls the blocking device (6) to switch to the blocking state during recuperation operation as long as the current danger and safety parameters are below a predetermined threshold value, and that during recuperation operation it controls the blocking device (6) to switch to the release state as soon as the current danger and safety parameters exceed the predetermined threshold value.

Description

The present invention relates to a combination of a battery-electric vehicle and a trailer with an overrun brake. The invention also relates to a battery-electric vehicle and a trailer for such a team.

Recuperation or recuperation operation is very important for the range of battery-electric vehicles. During recuperation operation, at least one electric motor of the vehicle is operated as a generator in order to convert kinetic energy into electrical energy, which is then used to charge the vehicle battery. Such recuperation is used when the vehicle is coasting, for example when the vehicle is not supposed to accelerate on a downhill gradient, as well as during light and medium braking processes in which the vehicle speed is to be reduced with a slight to medium deceleration, so that a mechanical braking system of the vehicle does not have to intervene yet.

A trailer is usually equipped with an overrun brake, which automatically activates a braking device of the trailer when the trailer hits the respective towing vehicle, i.e. wants to push the towing vehicle. The overrun brake thus relieves the load on the vehicle's braking system and is important for the operational safety of a vehicle combination.

In a combination with a battery-electric vehicle as a towing vehicle, there is a desire to also be able to use the kinetic energy of the trailer for recuperation. However, if the trailer has an overrun brake, this works in the opposite way, so that the kinetic energy of the trailer cannot be used for recuperation.

From the DE 10 2020 006 249 B3 an electrically powered push trailer is known which has a motor, a battery and a controller, wherein the push trailer can carry out a recuperation operation in which the battery of the trailer is charged.

From the DE 10 2020 105 787 A1 a combination of a battery-electric vehicle and a trailer with an overrun brake is known, in which, for the recuperation operation of the towing vehicle, care is taken to ensure that the deceleration caused by the recuperation remains below a predetermined braking deceleration at which the overrun brake responds. This makes it possible to use part of the trailer's kinetic energy to recuperate the vehicle battery. Stronger delays are then no longer possible in recuperation mode.

From the EP 3 696 032 B1 a trailer with an energy recovery device is known, the energy recovery device being designed to recover energy generated by braking the trailer. The trailer has an overrun brake that can be activated and deactivated as needed. This allows the kinetic energy of the trailer to be largely used for recuperation, although this requires a great deal of effort since the trailer must be equipped with its own energy recovery device.

From the DE 20 2018 106 549 U1 an electric drive and braking device for a trailer is known which has a recuperation brake. Here too, the kinetic energy of the trailer can be used for recuperation, but for a trailer-side drive system, so a lot of effort has to be made here too.

Other trailers with overrun brakes and recuperation braking devices are available DE 20 2018 003 774 U1 , the EP 3 388 297 B1 and the DE 10 2010 042 907 A1 known.

Another trailer with its own drive and recuperation is finally out of the picture EP 3 416 860 B1 known.

The present invention deals with the problem of providing an improved embodiment for a combination of a battery-electric vehicle and a trailer with an overrun brake as well as for a vehicle and a trailer for such a combination, in which in particular the kinetic energy of the trailer is used for recuperation of the battery of the vehicle can be used better.

The problem underlying the invention is solved by the subject matter of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The invention is based on the general idea of equipping the trailer with a controllable blocking device, with the help of which the function of the overrun brake can be blocked and released as required. A vehicle control determines and/or receives information about the recuperation behavior of the vehicle and about danger and safety parameters of the combination, i.e. the vehicle and/or the trailer. A trailer control is coupled to the vehicle control and to the blocking device. As long as the current danger and safety parameters are below a predetermined threshold value, the trailer control controls the blocking device to block the braking function of the overrun brake when the vehicle is in recuperation mode. In this case, the entire kinetic energy of the trailer can be used for the vehicle-side recuperation system. However, as soon as the current dangers and safety parameters exceed the predetermined threshold value, the trailer control controls the blocking device to release the braking function of the overrun brake, so that the overrun brake can brake the trailer. In this case, the vehicle's kinetic energy can still be used for recuperation. By blocking the braking function of the overrun brake, recuperation can also be carried out at higher braking decelerations at which the released overrun brake would normally respond. This enables efficient recuperation for the team.

Specifically, the trailer has a controllable blocking device which is coupled to the overrun brake and which can be switched into a blocking state in which the blocking device prevents the overrun brake from functioning and into a release state in which the blocking device releases the overrun brake function. The vehicle has a vehicle control system that determines and/or receives information about the recuperation behavior of the vehicle and about danger and safety parameters. The trailer, preferably the vehicle, also has a trailer control for controlling the blocking device, which is coupled to the blocking device and to the vehicle control. The trailer control is now configured, i.e. designed or programmed, in such a way that the trailer control controls the blocking device to switch to the blocking state during recuperation operation as long as the current danger and safety parameters are below a predetermined threshold value, with the trailer control controlling the blocking device during recuperation operation Switching to the release state is activated as soon as the current danger and safety parameters exceed the predetermined threshold value.

It can expediently be provided that the blocking device is in the release state in an uncontrolled initial state. It can also be provided that the blocking device switched to the blocking state automatically switches back to the release state in the event of a power failure or a signal failure.

According to an advantageous embodiment, the blocking device can have a piston-cylinder unit which has a cylinder and a piston which is adjustable and/or guided in the cylinder, the piston in the cylinder separating two chambers filled with hydraulic fluid from one another and at least one piston rod guided out of the cylinder having. The blocking device is also equipped with a hydraulic line which hydraulically connects the two chambers to one another and which contains a controllable valve for blocking and opening the hydraulic line. The trailer control is now expediently coupled to this valve and controls the valve to block in order to switch the blocking device to the blocking state. To switch the blocking device to the release state, the trailer control controls the valve to open the hydraulic line. As long as the hydraulic line is open, the piston in the cylinder can be adjusted almost freely, with the hydraulic fluid being moved from one chamber via the hydraulic line to the other chamber. However, as soon as the valve closes and the hydraulic line is blocked, the incompressible hydraulic fluid prevents further displacement of the piston within the cylinder. The piston is then positioned or blocked in a stationary manner relative to the cylinder. If this piston-cylinder unit is appropriately integrated into the overrun brake, its function can be blocked and released. The function of the overrun brake is typically based on a relative adjustment, namely on an approach of the trailer to the towing vehicle, whereby a relative adjustment between two components must take place within the trailer, expediently in a drawbar. By cleverly integrating the piston-cylinder unit, e.g. by coupling it with the adjustable components, the possibility of relative adjustment within the trailer can now be blocked and released in a controlled manner.

According to an advantageous embodiment, the overrun brake can be a drawbar element that is firmly or rigidly connected to the trailer, a coupling element that is adjustable in a pushing and pulling direction of the trailer relative to the drawbar element, which is coupled to a trailer hitch of the vehicle and which is connected to a braking device of the Trailer is coupled to actuate the braking device, and have a biasing spring which drives the coupling element and the drawbar element apart in the pushing and pushing direction into a starting position in which the braking device is unactuated. The coupling element and the drawbar element are usually located on a drawbar of the trailer, via which the trailer is coupled to the respective towing vehicle.

The cylinder of the piston-cylinder unit can now expediently be firmly connected to one element of the coupling element and drawbar element, while the piston of the piston-cylinder unit is firmly connected to the other element of the coupling element and drawbar element via the respective piston rod. As a result, a relative adjustment between the coupling element and the drawbar element is inevitably coupled with a relative adjustment of the piston in the cylinder. As long as the hydraulic line, which hydraulically connects the two chambers in the cylinder, is open, the coupling element and drawbar element can move relative to one another. The function of the overrun brake is then enabled. However, as soon as the hydraulic line is blocked, the piston in the cylinder is blocked, so that the coupling element and the drawbar element are no longer adjustable relative to one another. The function of the overrun brake is then blocked.

A particularly simple structure results when a longitudinal direction of the piston-cylinder unit, in which the piston is adjustable relative to the cylinder, is aligned parallel to the pushing and pulling direction, i.e. parallel to the degree of freedom in which the coupling element is adjustable relative to the drawbar element .

In an advantageous development, the piston-cylinder unit can form or replace the actuating element. For example, a first piston rod, which is led out of the cylinder at a first end face, can then be coupled to the braking device of the trailer, while a second piston rod, which is led out of the cylinder at a second end face, can be coupled to the trailer coupling. This results in a high degree of integration of the blocking device or the piston-cylinder unit in the trailer, especially in its drawbar.

Additionally or alternatively, the spring element can be arranged in one of the chambers of the cylinder and can be supported on the cylinder and the piston. This also results in a structural integration of a further component of the overrun brake into the blocking device or into the piston-cylinder unit. Such integration has particular advantages in terms of installation space.

In another embodiment, the vehicle combination may have an electrical interface having a plurality of electrical lines, which has a socket arranged on the vehicle and a plug arranged on the trailer. At least one of the lines of the interface can now expediently electrically couple the trailer control with the blocking device if the trailer control is arranged on the vehicle. If, on the other hand, the trailer control is arranged on the trailer, the vehicle control can be electrically connected to the trailer control via the respective cable.

The arrangement of the trailer control on the vehicle is preferred because, for example, it can be integrated into the vehicle control in terms of hardware and/or implemented in software. If further embodiments are described below using the preferred variant, it is clear that these embodiments can also be implemented accordingly with the other, non-preferred variant.

Electrical consumers of the trailer can be connected to the vehicle's on-board electrical system via the electrical interface mentioned above. Electrical consumers of the trailer are, in particular, lighting of the trailer that is required for road operation. Additional electrical consumers of the trailer can also be supplied with electrical energy via this interface, such as a refrigerator in a trailer designed as a caravan. The use of a line from such an interface, which is regularly present anyway, for coupling the trailer control with the blocking device reduces the manufacturing costs. Alternatively, it is also fundamentally conceivable for the trailer and vehicle to be equipped with a separate electrical interface in order to electrically couple the trailer control with the blocking device. This separate interface can be wireless or wired.

According to another advantageous embodiment, the trailer can have a monitoring sensor which monitors the driving behavior of the trailer and which is coupled to the trailer control or, in addition to the trailer control, to the blocking device. Such a monitoring sensor can, for example, detect a rocking of the trailer. This monitoring sensor can now expediently generate danger and safety parameters depending on the driving behavior of the trailer. These danger and safety parameters can, for example, correlate with a rocking condition of the trailer. The monitoring sensor can now transmit the determined danger and safety parameters to the trailer control and / or control the blocking device to switch to the release state as soon as the danger and safety parameters exceed a predetermined limit value. In particular, this makes it possible for the trailer-side monitoring sensor to monitor the situation caused by the vehicle-side trailer control Blocking the overrun brake during recuperation operation is overridden to release the overrun brake.

A battery-electric vehicle according to the invention is suitable for use in a trailer of the type described above. For this purpose, the vehicle has a trailer hitch for coupling the trailer of the trailer and a trailer control for controlling a blocking device of the trailer. Furthermore, the vehicle is equipped with a vehicle control system that determines or receives information about the vehicle's recuperation behavior and about danger and safety parameters. The trailer control is also configured here so that during recuperation operation it controls the blocking device to switch to the blocking state as long as the current danger and safety parameters are below a predetermined threshold value, and to switch to the release state as soon as the current danger and safety parameters are reached exceed the predetermined threshold value.

The vehicle can expediently have a socket which forms a vehicle-side component of an electrical interface between the vehicle and trailer comprising several electrical conductors, the trailer control being coupled to the socket via at least one line of this interface.

A trailer according to the invention is suitable for use in a trailer of the type described above or for use with a vehicle of the type described above. For this purpose, the trailer has an overrun brake and a controllable blocking device which is coupled to the overrun brake and which is in a blocked state , in which the blocking device prevents the function of the overrun brake, and can be switched to a release state in which the blocking device releases the function of the overrun brake. Furthermore, the blocking device is configured so that it can be controlled in particular by the trailer control of the vehicle in order to switch the blocking device into the blocking state or into the release state.

The trailer can expediently have a plug which forms a trailer-side component of an electrical interface between the vehicle and the trailer which has a plurality of electrical lines, the blocking device being connected to the plug via at least one line.

Additionally or alternatively, the blocking device can be equipped with the piston-cylinder unit described above. Additionally or alternatively, the overrun brake according to the embodiment described above can be equipped with a drawbar element and a coupling element that is adjustable relative thereto. Furthermore, the piston-cylinder unit can also be integrated into the overrun brake here. In particular, the piston-cylinder unit can form the coupling element of the overrun brake. In addition, the trailer can be equipped with the monitoring sensor described above.

A configuration is particularly advantageous in which the piston-cylinder unit has two piston rods that are firmly connected to the piston and are led out of the cylinder at opposite ends, one piston rod being coupled to the trailer hitch, while the other piston rod is connected to the braking device is coupled. In this respect, in this embodiment, the two piston rods together with the piston form the coupling element, while the cylinder forms the drawbar element or is firmly connected to it.

Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures based on the drawings.

It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or alone, without departing from the scope of the invention. The above-mentioned and below-mentioned components of a higher-level unit, such as a device, a device or an arrangement, which are designated separately, can form separate parts or components of this unit or can be integral areas or sections of this unit, even if this shown differently in the drawings.

Preferred exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description, with the same reference numbers referring to the same or similar or functionally the same components.

• 1 eine stark vereinfachte, schaltplanartige Prinzipdarstellung eines Gespanns, bei dem ein Fahrzeug über einen Kupplungsbereich mit einem Anhänger gekuppelt ist,
• 2 eine stark vereinfachte, schaltplanartige Prinzipdarstellung des Kupplungsbereichs,
• 3 eine Ansicht des Kupplungsbereichs wie in 2, jedoch bei einer anderen Ausführungsform.

It shows, schematically,

• 1 a highly simplified, circuit diagram-like schematic representation of a vehicle combination in which a vehicle is coupled to a trailer via a coupling area,
• 2 a greatly simplified, circuit diagram-like schematic representation of the clutch area,
• 3 a view of the coupling area as in 2 , but in a different embodiment.

Accordingly 1 A battery-electric vehicle 1 and a trailer 2 form a trailer 3. The trailer 2 has an overrun brake 4, which is coupled in a suitable manner to a braking device 5 of the trailer 2. Furthermore, the trailer 2 has a controllable blocking device 6, which is in 1 is indicated by a switch symbol. The blocking device 6 is coupled to the overrun brake 4 and can be switched into a blocking state and a release state. The open switch in 1 symbolizes the blocking state of the blocking device 6. In the blocking state, the blocking device 6 prevents the function of the overrun brake 4. In the release state, however, the blocking device 6 enables the function of the overrun brake 4. In other words, the overrun brake 4 functions properly in the released state, but not in the blocked state.

The vehicle 1 has a vehicle control 7, which determines and/or receives information about the recuperation behavior of the vehicle 1 as well as about danger parameters and safety parameters. It is clear that the vehicle control 7 is coupled to corresponding other systems, in particular sensors, of the vehicle 1, which, however, are not shown here for simplicity. The trailer 3 also has a trailer control 8, which is used to control the blocking device 6. For this purpose, the trailer control 8 is coupled on the one hand with the vehicle control 7 and on the other hand with the blocking device 6. According to 1 For this purpose, the trailer control 8 is electrically coupled to the blocking device 6 via a control line 21. In the example shown, the trailer control 8 is arranged on the vehicle 1. In another embodiment, not shown here, the trailer control 8 can also be arranged on the trailer 2.

The trailer control 8 is now configured so that when the vehicle 1 is in recuperation mode, it controls the blocking device 6 to switch to the blocking state as long as the current danger and safety parameters are below a predetermined threshold value. Furthermore, the trailer control 8 is configured so that during recuperation operation of the vehicle 1 it controls the blocking device 6 to switch to the release state as soon as the current danger and safety parameters exceed the predetermined threshold value. In addition, the trailer control 8 is configured so that outside the recuperation operation of the vehicle 1, i.e. in particular during towing operation of the vehicle 1, it controls the blocking device 6 to switch to the release state, so that the overrun brake 4 is ready for operation.

In the example of 1 the vehicle 1 has four wheels 9. The trailer 2 is equipped with two wheels 9, each of which is assigned a brake unit 10 of the braking device 5. The coupling between vehicle 1 and trailer 2 can be designed as a conventional ball coupling and takes place in a coupling area 11, which is in the 2 and 3 shown enlarged as a side view.

According to the 2 and 3 the blocking device 6 has a piston-cylinder unit 12 which has a cylinder 13 and a piston 14 which can be adjusted in the cylinder 13. The piston 14 separates two chambers 15 and 16 in the cylinder 13, which are filled with a hydraulic fluid. The piston 14 is firmly connected to at least one piston rod 17, which is led axially out of the cylinder 13. In the example of 1 the piston-cylinder unit 12 only has a single piston rod 17. In the example of 3 On the other hand, exactly two piston rods 17 and 18 are shown, which are led axially out of the cylinder 13 at two ends facing away from one another, i.e. at opposite ends or end faces.

The blocking device 6 also has a hydraulic line 19, which is connected to the cylinder 13 in such a way that it hydraulically connects both chambers 15, 16 to one another. The blocking device 6 also has a controllable valve 20 arranged in the hydraulic line 19, which is in the 2 and 3 is indicated by a switch symbol. With the help of the valve 20, the hydraulic line 19 can be opened and closed. The valve 20 can also be arranged directly on the cylinder 13, that is to say at one end of the hydraulic line 19.

The trailer control 8 is in the embodiments 2 and 3 electrically coupled to the valve 20 via the control line 21. The trailer control 8 controls the valve 20 to block the hydraulic line 19 in order to switch the blocking device 6 to the blocking state. The open switch in the 2 and 3 symbolizes the blocked hydraulic line 19 and thereby again represents the blocking state of the blocking device 6. The trailer control 8 controls the valve 20 to open the hydraulic line 19 in order to switch the blocking device 6 to the release state.

According to the 2 and 3 The overrun brake 4 can be a coupling element 22, a dike Selelement 23 and a biasing spring 24 have. The coupling element 22 is coupled to a trailer coupling 25 of the vehicle 1. The drawbar element 23 is firmly connected to the trailer 2 or to a support frame of the trailer 2. The coupling element 22 is in one in the 1 until 3 Push and pull direction 26 indicated by a double arrow is arranged adjustable relative to the drawbar element 23 and is also coupled to the braking device 5, so that an adjustment movement directed towards or into one another between the coupling element 22 and the drawbar element 23 actuates the braking device 5 for braking the trailer 2. When adjusting the coupling element 22 and the drawbar element 23 towards each other, the coupling element 22 moves in the direction of the trailer 2. The biasing spring 24 is supported on the coupling element 22 and on the drawbar element 23 in such a way that it moves the coupling element 22 and the drawbar element 23 into an initial position from one another drives away or apart. In this starting position, the braking device 5 is not actuated.

According to the 2 and 3 The piston-cylinder unit 12 of the blocking device 6 is now coupled to the overrun brake 4 in such a way that the cylinder 13 is firmly connected to one element of the coupling element 22 and the drawbar element 23, while the piston 14 is firmly connected to the other element of the coupling element 22 and Drawbar element 23 is firmly connected.

The braking device 5 is actuated when the coupling element 22 is retracted into the drawbar element 23 in that the coupling element 22 drives a deflection lever 30 mounted on the drawbar element 23, which then pulls on a tension element 31, for example a rope or a rod. The tension element 31 is coupled to the braking device 5 in such a way that pulling on the tension element 31 causes the desired braking actuation of the braking device 5. The relative movements required for the braking process are in the 2 and 3 indicated by arrows and labeled 32.

In the example of 2 the cylinder 13 is firmly connected to the coupling element 22, for example via a linkage 27. The piston 14 is firmly connected to the drawbar element 23 via the piston rod 17, for example via a linkage 28. In 2 a bellows 29 is also indicated, which envelops the movable area of the coupling element 22 and drawbar element 23 as well as the spring element 24 and protects it from contamination.

At the in 3 In the embodiment shown, the piston 14 is firmly connected to the deflection lever 30 via one piston rod 17 and to the trailer coupling 25 via the other piston rod 18. In this respect, the piston 14 with the two piston rods 17 and 18 forms the actuating element 22 in this embodiment. The cylinder 13 is firmly connected to the drawbar element 23. Furthermore, in this embodiment, the biasing spring 24 is arranged in one of the chambers 15, 16, here in the chamber 16 facing away from the vehicle 1, such that it is supported on the cylinder 13 and the piston 14 and drives it apart to enlarge the chamber 16.

According to 1 The team 3 can have an electrical interface 33, which in turn has several electrical lines. The interface 33 has a socket 34 arranged on the vehicle and a plug 35 arranged on the trailer 2. In the usual way, the plug 35 is coupled to electrical consumers of the trailer 2 via a cable, not shown here. At least one line of the interface 33 forms the signal line 21, via which the trailer control 8 is connected to the blocking device 6.

According to the 2 and 3 The trailer 2 can be equipped with a monitoring sensor 36, which monitors the driving behavior of the trailer 2 and thus generates correlating danger and safety parameters. For example, the monitoring sensor 36 can detect a rocking of the trailer 2. The monitoring sensor 36 can be coupled to the trailer control 8 via a signal line 37. Additionally or alternatively, the monitoring sensor 36 can be coupled to the blocking device 6, in particular to the valve 20, via a control line 38. The monitoring sensor 36 can thus transmit the determined danger and safety parameters of the trailer 2 to the trailer control 8, so that the trailer control 8 can take these danger and safety parameters into account when controlling the blocking device 6. In particular, the trailer control 8 can be configured so that it controls the blocking device 6 to switch to the release state as soon as the danger and safety parameters of the trailer 2 exceed a predetermined limit value. It is also conceivable that the monitoring sensor 36 is configured so that it directly controls the blocking device 6 to switch to the release state as soon as the danger and safety parameters of the trailer 2 exceed the predetermined limit value.

According to 1 the vehicle 1 has at least one electric motor 39 for driving at least one wheel 3 of the vehicle 1 and a battery 40 for supplying the electric motor 39 with electrical energy. The electric motor 39 can be operated as a generator for recuperation. The battery 40 is charged in recuperation mode.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102020006249 B3 [0005]
• DE 102020105787 A1 [0006]
• EP 3696032 B1 [0007]
• DE 202018106549 U1 [0008]
• DE 202018003774 U1 [0009]
• EP 3388297 B1 [0009]
• DE 102010042907 A1 [0009]
• EP 3416860 B1 [0010]

Claims (10)

Trailer (3) consisting of a battery-electric vehicle (1) and a trailer (2) with an overrun brake (4), - wherein the trailer (2) has a controllable blocking device (6) which is coupled to the overrun brake (4) and which is in a blocking state, in which the blocking device (6) prevents the overrun brake (4) from functioning, and in a release state can be switched by the blocking device (6) releasing the function of the overrun brake (4), - wherein the vehicle (1) has a vehicle control (7) which determines and/or receives information about the recuperation behavior of the vehicle (1) and about danger and safety parameters, - wherein the trailer (3) has a trailer control (8) for controlling the blocking device (6), which is coupled to the blocking device (6) and to the vehicle control (7), - wherein the trailer control (8) is designed and/or programmed in such a way that during recuperation operation it controls the blocking device (6) to switch to the blocking state as long as the current danger and safety parameters are below a predetermined threshold value, and that during recuperation operation controls the blocking device (6) to switch to the release state as soon as the current danger and safety parameters exceed the predetermined threshold value. Team (3) after Claim 1 , characterized in that - the blocking device (6) has a piston-cylinder unit (12) which has a cylinder (13) and a piston (14) which is guided in the cylinder (13) and has two pistons (14) in the cylinder (13). separates chambers (15, 16) filled with hydraulic fluid from one another and has at least one piston rod (17, 18) led out of the cylinder (13), - that the blocking device (6) has a hydraulic line (19) which connects the two chambers (15, 16) hydraulically connects to one another and which contains a controllable valve (20) for blocking and opening the hydraulic line (19), - that the trailer control (8) is coupled to the valve (20) and controls the valve (20) for blocking to switch the blocking device (6) to the blocking state, and to open it in order to switch the blocking device (6) to the release state. Team (3) after Claim 1 or 2 , characterized in that - the overrun brake (4) has a coupling element (22) which is coupled to a trailer coupling (25) of the vehicle (1), a drawbar element (23) which is firmly connected to the trailer (2), and has a biasing spring (24), - that the coupling element (22) is adjustable in a pushing and pulling direction (26) of the trailer (3) relative to the drawbar element (23) and is coupled to a braking device (5) of the trailer (2), in such a way that an adjustment of the coupling element (22) and drawbar element (23) towards one another actuates the braking device (5) for braking the trailer (2), - that the biasing spring (24) is supported on the coupling element (22) and on the drawbar element (23). is, such that it drives the coupling element (22) and the drawbar element (23) apart into a starting position in which the braking device (5) is deactivated, - that the cylinder (13) of the piston-cylinder unit (12) also one element of the coupling element (22) and drawbar element (23) is firmly connected, while the piston (14) is firmly connected to the other element of the coupling element (22) and drawbar element (23). Team (3) after Claim 3 , characterized in - that the piston-cylinder unit (12) forms the coupling element (22), and / or - that the spring element (24) is arranged in one of the chambers (15, 16) of the cylinder (13) and on the cylinder (13) and on the piston (14), and / or - that the piston-cylinder unit (12) has two piston rods (17, 18) led out of the cylinder (13) at opposite ends, each of which is firmly attached are connected to the piston (14), one piston rod (17) being coupled to the braking device (5), while the other piston rod (18) is coupled to the trailer coupling (25). Team (3) according to one of the Claims 1 until 4 , characterized in that - the trailer (3) has an electrical interface (33) which has several electrical lines and which has a socket (34) arranged on the vehicle (1) and a plug (35) arranged on the trailer (2), - that at least one electrical line of the interface (33) electrically couples the trailer control (8) to the blocking device (6). Team (3) according to one of the Claims 1 until 5 , characterized in that - the trailer (2) has a monitoring sensor (36) which monitors the driving behavior of the trailer (2) and which is connected to the trailer control (8) and/or in addition to the trailer control (8) with the blocking device (6). is coupled, - that the monitoring sensor (36) depends ness of the driving behavior of the trailer (2) generates danger and safety parameters of the trailer (2), - that the monitoring sensor (36) transmits the determined danger and safety parameters of the trailer (2) to the trailer control (8) and / or the blocking device (6 ) to switch to the release state as soon as the danger and safety parameters of the trailer (2) exceed a predetermined limit value. Battery-electric vehicle (1) for a team (3) according to one of the preceding claims, - with a trailer coupling (25) for coupling the trailer (2) of the team (3), - with a trailer control (8) for controlling a blocking device (6) of the trailer (2), - with a vehicle control (7), which determines and/or receives information about the recuperation behavior of the vehicle (1) and about danger and safety parameters, - wherein the trailer control (8) is coupled to the vehicle control (7) and is designed and/or programmed in such a way that it controls the blocking device (6) to switch to the blocking state during recuperation operation, as long as the current danger and safety parameters are below one predetermined threshold value, and that during recuperation operation it controls the blocking device (6) to switch to the release state as soon as the current danger and safety parameters exceed the predetermined threshold value. Vehicle (1) after Claim 7 , characterized in that - the vehicle (1) has a socket (34) which forms a vehicle-side component of an electrical interface (33) having several electrical lines between the vehicle (1) and the trailer (2), the trailer control ( 8) is coupled to the socket (34) via at least one line. Trailer (2) for a team according to one of the Claims 1 until 6 , - with an overrun brake which is coupled to a braking device (5) of the trailer (2), - with a blocking device (6) which is coupled to the overrun brake (4) and which is in a blocking state in which the blocking device (6 ) prevents the function of the overrun brake (4) and can be switched to a release state in which the blocking device (6) releases the function of the overrun brake (4). Trailer (2) after Claim 9 , characterized in that - the trailer (2) has a plug (35) which forms a trailer-side component of an electrical interface (33) having several electrical lines between the vehicle (1) and the trailer (2), the blocking device ( 6) is connected to the plug (35) via at least one line, and/or - that the blocking device (6) according to Claim 2 is designed, and / or - that the overrun brake (4) after Claim 3 is designed, and / or - that the blocking device (6) and the overrun brake (4) according to Claim 4 are designed, and / or - that the trailer (2) has a monitoring sensor (36). Claim 6 having.

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