REDUNDANT ELECTROMECHANICAL BRAKE SYSTEM AND ACTUATOR THEREFOR

Description

[0001] The present invention relates to an electromechanical braking system for a vehicle, comprising at least one first actuator and at least one first energy supply device, wherein one of the energy supply devices is assigned to the first actuator as a primary source for supplying electrical energy, and the first actuator has a connection to this energy supply device assigned as the primary source. Furthermore, the present invention relates to an actuator, in particular an electromechanical braking device for a vehicle, which has an energy absorption device for connection to an energy supply device. The invention further relates to a vehicle, a trailer, and a commercial vehicle combination having such a braking system and / or such an actuator.

[0002] Vehicles with electromechanical braking systems, for example, have several electromechanical braking devices as actuators, each of which is supplied with power for operation in groups by different power supply devices. For example, the braking devices attached to a front axle of the vehicle are supplied with power by a first power supply device, and the braking devices attached to a rear axle of the vehicle are supplied with power by a second power supply device.

[0003] If the power supply to at least one of the braking devices fails, for example, due to a cable break in a distribution network of the associated power supply device, this braking device can no longer be used for braking. This reduces the braking performance of the braking system. This poses an increased safety risk, especially if only braking devices located on wheels that are relieved of load during the braking process are supplied with power, as the maximum transferable braking force is significantly reduced, thus making sufficient deceleration of the vehicle impossible.

[0004] From DE 100 36 287 A1 it is known to supply control devices for hydraulic braking systems on different vehicle axles with electrical energy from independent energy circuits.

[0005] DE 10 2007 021 286 A1 proposes to implement a redundant energy supply for braking devices by means of a main energy supply unit and two additional emergency energy supply units.

[0006] From DE 10 2011 084 534 A1 an electronic control unit for a braking system of a motor vehicle is known, which has two or more independent computing units, each of which is assigned a power supply.

[0007] Against this background, it is the object of the present invention to improve the operational reliability of an electromechanical braking system, an actuator, a vehicle, a trailer and / or a commercial vehicle combination.

[0008] The object is achieved by an electromechanical braking system having the features of patent claim 1, an actuator having the features of patent claim 12, a vehicle having the features of patent claim 14, a trailer having the features of patent claim 17, and a commercial vehicle combination having the features of patent claim 18. Advantageous embodiments are the subject of the dependent claims.

[0009] To achieve this objective, an electromechanical braking system for a vehicle is proposed, comprising at least one first actuator, at least one first energy supply device, and a second energy supply device. One of the energy supply devices is assigned to the first actuator as a primary source for supplying electrical energy, and the first actuator has a connection to this energy supply device assigned as a primary source. The first actuator additionally has a connection to an energy supply device assigned to it as a secondary source for supplying the first actuator with electrical energy from the energy supply device assigned as the primary source.

[0010] This provides two independent power supply units for supplying the actuator with electrical energy. If one of the power supply units fails, the other supplies the actuator with power. This allows the first actuator to be used even if it is not receiving power from its primary source. This increases the operational reliability of a vehicle equipped with this type of braking system.

[0011] In a further embodiment, the braking system has at least one second actuator to which one of the energy supply devices is assigned as a primary source for supplying electrical energy, wherein the second actuator has a connection to this energy supply device assigned as a primary source, and wherein the second actuator additionally has a connection to an energy supply device assigned to it as a secondary source for supplying the actuator with electrical energy from the energy supply device assigned as the primary source.

[0012] Thus, two independent power supply units are available for each actuator. This improves operational reliability by preventing failures or at least mitigating their effects, particularly loss of braking force.

[0013] In a further embodiment, at least one of the actuators is assigned one of the energy supply devices that is not assigned to it as a primary source as a secondary source.

[0014] For example, if the braking system has a first power supply device and a second power supply device, the actuators can be divided into first and second actuators, with the first actuators being assigned the first power supply device as the primary source and the second actuators being assigned the second power supply device as the primary source. The other power supply device is then assigned to each actuator as a secondary source. This allows additional redundancy of the power supply for the actuators to be achieved with the existing power supply devices.

[0015] In a further embodiment, at least one of the actuators has a primary energy absorption device and a secondary energy absorption device, each for connection to an energy supply device.

[0016] This simplifies the connection to the power supply devices. In particular, each of the energy absorption devices can be configured and / or designed for different properties of the power supply device to be connected to it.

[0017] In a further embodiment, at least one of the energy absorption devices has a signal input for receiving a control signal for controlling the actuator.

[0018] In certain cases, for example when using a CAN bus, signals for controlling the actuator can be transmitted together with the required energy over the same connection.

[0019] In a further embodiment, the energy absorption device having the signal input is configured to absorb a power that is smaller than the power that the other energy absorption device is configured to absorb.

[0020] The power that can be transmitted over a connection, such as a CAN bus, may be limited. The energy absorption device containing the signal input, for example, limits the current it can absorb to prevent damage to the connection and the associated power supply device. This further increases operational reliability.

[0021] In a further embodiment, at least one of the actuators is assigned a recuperation device as a secondary source.

[0022] In the event of a failure, the energy required to operate the actuators that exert a braking effect is also recovered from the vehicle's motion, thus achieving additional braking. Furthermore, even if the first and second power supply units fail, braking can still be achieved.

[0023] In a further embodiment, at least one of the actuators is assigned a third energy supply device as a secondary source.

[0024] This means that even if both the first and second power supply units have failed, a braking effect can still be achieved.

[0025] In a further embodiment, one of the connections between one of the actuators and the power supply device assigned to it as a secondary device has a direct electrical connection.

[0026] This is the easiest way to connect multiple power supply devices to one actuator.

[0027] In a further embodiment, one of the connections between one of the actuators and the energy supply device assigned to it as a secondary source comprises a connection between a first distribution network connected to the primary source and a second distribution network connected to the secondary source.

[0028] A connection between the two energy supply facilities via the distribution grid may allow at least partial use of the facilities of the other energy supply facility. For example, supply lines, control devices, power limiters, etc., can be shared with the other energy supply facility.

[0029] In a further embodiment, one of the connections between one of the actuators and the energy supply device assigned to it as a secondary source has a control device for controlling and / or regulating an energy flow between the secondary source and the actuator.

[0030] This makes it possible to take into account the power limits of the power supply device assigned as a secondary source. For example, if the first and second power supply devices are not designed to fully supply all actuators with power, then if one of the power supply devices fails, the remaining power supply device can dissipate the same amount of power for the actuators affected by the failure, preventing the remaining power supply device from becoming overloaded.

[0031] In a further embodiment, the first actuators are arranged on a front axle of the vehicle, wherein the first actuators are assigned the first energy supply device as a primary source, and the second actuators are arranged on a rear axle of the vehicle, wherein the second actuators are assigned the second energy supply device as a primary source.

[0032] The fact that the actuators of each axle in this case are very likely to fail simultaneously or can only be operated with reduced power prevents a rotational movement of the vehicle from being initiated by asymmetric braking power on one axle.

[0033] In a further embodiment, the braking system has a control device for controlling energy absorption of the braking devices.

[0034] Such control devices and units can, for example, regulate the applied braking force or prevent overloading of the energy supply devices. Furthermore, the braking force of certain actuators, such as the actuators on the front axle, can be prioritized using such a control device. The energy flow from a control line, such as a CAN bus, can also be limited by such a control device. In the case of a limitation, the maximum braking force is reduced but still sufficient to ensure adequate deceleration of the vehicle. Adequate deceleration can, for example, be defined by a legal requirement and / or a standard.

[0035] The object is further achieved by an actuator, in particular an electromechanical braking device for an electromechanical braking system, which has a primary energy absorption device and a secondary energy absorption device, each for connection to a power supply device and a controllable selection device for selecting one of the power supply devices for supplying the actuator with electrical energy.

[0036] This improves the operational and failure safety of the actuator.

[0037] In further embodiments, the selection device is configured to select energy from the energy supply device connected to the secondary energy absorption device for use by the actuator in the event of a malfunction of the energy supply device connected to the primary energy absorption device.

[0038] In a redundant setup with multiple power supply units, the actuator can automatically switch from the failed power supply unit to a still functioning power supply unit, thus increasing reliability.

[0039] The object is further achieved by a vehicle comprising one of the aforementioned electromechanical braking systems and / or one of the aforementioned actuators.

[0040] Such a vehicle has improved operational and failure safety because its braking system can still exert braking force even if a primary source fails.

[0041] The object is further achieved by a trailer comprising one of the aforementioned electromechanical braking systems and / or one of the aforementioned actuators.

[0042] Such a trailer has improved operational and failure safety because its braking system can still exert braking force even if a primary source fails.

[0043] The task is further solved by a commercial vehicle combination comprising one of the aforementioned vehicles and one of the aforementioned trailers.

[0044] Such a commercial vehicle combination has improved operational and failure safety, as its braking system can still exert braking force even if a primary source fails.

[0045] The invention will be explained in more detail below using exemplary embodiments, which are shown only schematically in the attached figures. They show in detail: Fig. 1 is a schematic representation of a braking system according to an embodiment of the invention; Fig. 2 is a schematic representation of a braking system according to an embodiment of the invention; Fig. 3 is a schematic representation of a braking system according to an embodiment of the invention; and Fig. 4 is a schematic representation of a braking system according to an embodiment of the invention.

[0046] One in Fig. 1 The electromechanical braking system 10 shown for a vehicle has two first actuators, for example, first electromechanical braking devices 12, 14, arranged on a first axle 16 of the vehicle. Furthermore, the braking system 10 has two second actuators, here electromechanical braking devices 18, 20, arranged on a second axle 22 of the vehicle.

[0047] The first axle 16 can, for example, be a front axle of the vehicle. The second axle 22 can, for example, be a rear axle of the vehicle.

[0048] To supply the first braking devices 12, 14 with electrical energy, a first energy supply device 24 is provided, which has a first energy storage device 26. A first distribution network 28 is provided for the electrical connection of any devices of the vehicle to one another and connects the first energy supply device 24 connected thereto to the first braking devices 12, 14. The first braking devices 12, 14 each have a primary input 30 for connection to the first distribution network 28. During normal operation, the energy required to operate the first braking devices 12, 14 is received via the primary input 30 from a primary source assigned to them, which here is formed by the first energy supply device 24.

[0049] To supply the second braking devices 18, 20 with electrical energy, a second energy supply device 32 is provided, which has a second energy storage device 34. Analogous to the first distribution network 28, a second distribution network 36 connects the second energy supply device 32 to primary inputs 30 of the second braking devices 18, 20. The second energy supply device 32 is thus assigned to the second braking devices 18, 20 as a primary source.

[0050] The braking devices 12, 14, 18, 20 each have a secondary input 38 for connection to an energy supply device 24, 32 assigned to the braking devices 12, 14, 18, 20 as a secondary source.

[0051] Since only two energy supply devices 24, 32 are present, each of the braking devices 12, 14, 18, 20 is assigned one of the energy supply devices 24, 32 as the primary source, and the other energy supply device 24, 32 as the secondary source. In the present embodiment, the first braking devices 12, 14 are assigned the first energy supply device 24 as the primary source, and the second energy supply device 32 as the secondary source. The second braking devices 18, 20 are assigned the second energy supply device 32 as the primary source, and the first energy supply device 24 as the secondary source.

[0052] The secondary inputs 38 are therefore each connected to the distribution network 28, 36, to which the energy supply device 24, 32 assigned as a secondary source is connected.

[0053] During normal operation, the first braking devices 12, 14 receive the energy required for their operation from their primary source, i.e., the first energy supply device 24. Likewise, the second braking devices 18, 20 receive the energy required for their operation from their assigned primary source, i.e., the second energy supply device 32. This serves to provide redundancy between the braking devices 12, 14, 18, 20. If, for example, the second energy supply device 32 fails, and thus the second braking devices 18, 20 are no longer functional, the vehicle can still be braked using the first braking devices 12, 14, which draw their energy from the still-functioning first energy supply device 24. The vehicle therefore remains controllable even if only one of the energy supply devices 24, 32 fails or malfunctions.

[0054] In order to increase the possible braking effect in the event of a failure of one of the energy supply devices 24, 32, the braking devices 12, 14, 18, 20 can use energy from the secondary source assigned to it for their operation if their primary source fails. For this purpose, the braking devices 12, 14, 18, 20 each have a control device configured to detect a failure and / or malfunction of the energy supply device 24, 32 assigned as the primary source and, upon detection of a failure and / or malfunction of the energy supply device 24, 32 assigned as the primary source, to switch the energy supply device used from the primary source to the energy supply device 24, 32 assigned as the secondary source.As a result, in addition to the braking effect of the braking devices 12, 14, 18, 20, whose primary source does not exhibit any malfunction and / or disturbance, a braking effect of the further braking devices 12, 14, 18, 20 can be provided.

[0055] In a further embodiment, the control device can be configured to limit the power drawn from the secondary source. This is particularly advantageous when the power available from the energy supply devices 24, 32 is not sufficient to operate all braking devices 12, 14, 18, 20 simultaneously. By limiting the power, the maximum braking effect achievable with one energy supply device 24, 32 is achieved.

[0056] In further embodiments in which further energy supply devices are present, one of the further energy supply devices can also be assigned as a secondary source, for example.

[0057] An example of such an embodiment is shown in Fig. 2 shown. The first power supply device 24 has only connections to the primary inputs 30 of the first braking devices 12, 14. The second power supply device 32 has only connections to the primary inputs 30 of the second braking devices 18, 20.

[0058] A third energy supply device 40 has a third energy storage device 42 and a third distribution network 44. The third energy supply device 40 is connected to the secondary inputs 38 of the braking devices 12, 14, 18, 20. Furthermore, the third energy supply device 40 is assigned to the braking devices 12, 14, 18, 20 as a secondary source. If one of the energy supply devices 24, 32 malfunctions or fails, the energy provided by the third energy supply device 40 is available to perform braking operations.

[0059] This energy provided by the third energy supply device 40 may, for example, be limited in its available power. However, even this limited power can be used, for example, to generate a braking effect that, for example, in combination with the functioning braking devices 12, 14, 18, 20, is sufficient to meet corresponding safety standards.

[0060] In further embodiments, the third energy supply device 40 has, for example, a control device for controlling the braking effect of the braking devices 12, 14, 18, 20. Furthermore, the third distribution network 44 has, for example, signal lines for transmitting control signals from the control device to the braking devices 12, 14, 18, 20, for example, a CAN bus. The power available via the third distribution network 44 can be limited. Therefore, the secondary input 38 is configured, for example, to receive a power that is less than the power that the primary input 30 is configured to receive. For example, the secondary input 38 has a power limiting device so as not to overload the third distribution network 44.This can be particularly important if the cables and plugs used to connect the third distribution network 44 are dimensioned for the respective transportable power and could be damaged or destroyed if the transported power is too high.

[0061] The third energy supply device 40 can, in a further embodiment, as in Fig. 3 shown, instead of an energy storage device 42, a recuperation device 46. The recuperation device 46 is suitable for generating electrical energy from a rotational movement of an axle 16, 22, which is passed on to the secondary inputs 38 by means of the third distribution network 44. This results in an additional braking effect due to the recuperation in the event of a failure of the first or second energy supply device 24, 32.

[0062] In further embodiments, one of which is exemplified in Fig. 4As shown, the braking devices 12, 14, 18, 20 do not have secondary inputs 38. Instead, a controllable energy conducting device 48 is provided, which is connected to the distribution networks 28, 36. The energy conducting device 48 is designed and configured to detect a malfunction and / or a failure of the energy supply via one of the distribution networks 28, 36. Furthermore, the energy conducting device 48 is designed and configured, for example in the event of a malfunction of the energy supply devices 24, 32 connected to one of the distribution networks 28, 36, to introduce energy from the respective other distribution network 28, 36 into the distribution network 28, 36 with the malfunctioning energy supply device 24, 32.

[0063] In further embodiments, the energy conducting device 48 is designed and configured to limit the power introduced into the distribution network 28, 36 to which the malfunctioning energy supply device 24, 32 is connected.

[0064] In further embodiments, the third energy supply device 40 is connected to the energy conduction device 48 via the third distribution network 44, so that in the event of a malfunction of one of the energy supply devices 24, 32, the third energy supply device 40 can feed energy from the third energy supply device 40 into the distribution network 28, 36 with the malfunctioning energy supply device 24, 36. The third energy supply device 40 is thus assigned, for example, to all braking devices 12, 14, 18, 20 as a secondary source.

[0065] In further embodiments, another element in the vehicle, in particular of the electromechanical braking system, for example a foot brake module, electric compressor or another element from another vehicle electrical system or its energy supply, in particular the 24 V vehicle electrical system, is provided as the third energy supply device 40.

[0066] In further embodiments, only a portion of the braking devices 12, 14, 18, 20 is assigned a secondary source. For example, the braking devices 12, 14 arranged on a front axle 16 of the vehicle may be provided with an assigned secondary source, while the braking devices 18, 20 arranged on a rear axle 22 of the vehicle may not have a secondary source available. The function of the brakes of the front axle 16 is particularly important in the event of a malfunction of a power supply device 24, 32, since the front axle 16 experiences an increase in axle load during braking.

[0067] In further embodiments, all braking devices 12, 14, 18, 20 arranged jointly on an axle 16, 22 are designed either with or without a secondary power source. For example, the first braking devices 12, 14 arranged on the front axle 16 are designed either both with or both without a secondary power source, whereby the second energy supply device 32, for example, can be assigned to them as a secondary power source. This is particularly advantageous for avoiding a yaw moment due to an uneven braking process.

[0068] In further embodiments, other actuators are provided instead of the braking devices 12, 14, 18, 20.

[0069] In further embodiments, the energy conducting device 48 is formed by a control unit, for example a control unit of an EMBS system.

[0070] In further embodiments, the secondary inputs 38 have, for example, a control device for controlling the energy consumption of the braking device 12, 14, 18, 20, which avoids overloading the secondary source. In further embodiments, the braking device 12, 14, 18, 20 has, for example, a controllable selection device for selecting one of the energy supply devices 24, 32, 40 connected to it. Such a controllable selection device can, for example, be configured to select energy from the energy supply device 24, 32, 40 connected to a secondary energy consumption device, for example, the secondary input 38, for use in the braking device in the event of a malfunction of the energy supply device 24, 32, 40 connected to a primary energy consumption device, for example, the primary input 30.

[0071] The energy supply devices 24, 32, 40 are shown only schematically here. When using an energy storage device 26, 34, 42 configured, for example, as a battery, in particular as a lithium-ion battery, the energy supply devices 24, 32, 40 can have additional devices, such as a charging and / or discharging current controller or a temperature monitoring device. Each of the energy supply devices 24, 32, 40, regardless of their assignment as a primary or secondary source, can also be configured in any other suitable manner, for example, as a battery or fuel cell.

[0072] In particular, commercial vehicles can have multiple front and / or rear axles 16, 22 in further embodiments, for example, in a 6x2 or 6x4 configuration. In these cases, braking devices 12, 14, 18, 20 can be arranged on multiple front axles 16 and / or multiple rear axles 22.

[0073] A malfunction of the respective distribution network 28, 36, 44 is equivalent to a malfunction of the connected energy supply device 24, 32, 40 from the perspective of the braking device 12, 14, 18, 20. Such a malfunction of a distribution network 28, 36, 44 is often indistinguishable from a malfunction of the energy supply device 24, 32, 40, even from the perspective of the braking device. Such a distinction is not relevant for the function, since the essential indication of a malfunction within the meaning of this invention is that insufficient energy is available to operate the braking device 12, 14, 18, 20. A malfunction of the energy supply device 24, 32, 40 is therefore understood to mean any malfunction that leads to an insufficient energy supply to one of the braking devices 12, 14, 18, 20.

[0074] The designation "first braking device 12, 14" is to be understood as meaning that the braking devices 12, 14 so designated are assigned to a first group of braking devices. Likewise, the designation "second braking devices 18, 20" is to be understood as meaning that the braking devices 18, 20 so designated are assigned to a second group of braking devices. In further embodiments, each of the groups can be assigned, for example, fewer than two or more than two braking devices 12, 14, 18, 20. In further embodiments, the braking devices 12, 14, 18, 20 can, for example, each be constructed and / or designed identically or differently. LIST OF REFERENCE SYMBOLS

[0075] 10 (electromechanical) braking system 12 first (electromechanical) braking device / first actuator 14 first (electromechanical) braking device / first actuator 16 first axle (front axle) 18 second (electromechanical) braking device / second actuator 20 second (electromechanical) braking device / second actuator 22 second axle (rear axle) 24 first energy supply device 26 first energy storage device 28 first distribution network 30 primary input 32 second energy supply device 34 second energy storage device 36 second distribution network 38 secondary input 40 third energy supply device 42 third energy storage device 44 third distribution network 46 recuperation device 48 energy control device (control device)

Claims

1. An electromechanical braking system (10) for a vehicle, having at least one first actuator (12, 14), at least one first energy supply device (24) and one second energy supply device (32), wherein one of the energy supply devices (24, 32) is assigned to the first actuator (12, 14) as a primary source for supplying electrical energy and the first actuator (12, 14) has a connection to this energy supply device (24, 32) assigned as the primary source, wherein the first actuator (12, 14) additionally has a connection to an energy supply device (24, 32, 40) assigned to it as a secondary source for supplying the first actuator (12, 14) with electrical energy (24, 32, 40), wherein the electromechanical braking system (10) has at least one second actuator (18, 20) to which one of the energy supply devices (24, 32) is assigned as the primary source for supplying electrical energy, wherein the second actuator (18, 20) has a connection to this energy supply device (24, 32) assigned as the primary source, and wherein the second actuator (18, 20) additionally has a connection to an energy supply device (24, 32, 40) assigned to it as a secondary source for supplying the actuator (12, 14) with electrical energy, characterized in that one of the connections between one of the actuators (12, 14, 18, 20) and the energy supply device (24, 32, 40) assigned to it as the secondary source has a connection between a distribution network (28) connected to the primary source and a second distribution network (36) connected to the secondary source, wherein the connection has a controllable energy management device (48) which is connected to the distribution networks (28, 36) and is designed and configured to detect a malfunction and / or a failure of the energy supply via one of the distribution networks (28, 36) and to introduce energy from the respective other distribution network (28, 36) into the distribution network (28, 36) with the malfunctioning energy supply device (24, 32).

2. The electromechanical braking system as claimed in claim 1, characterized in that at least one of the actuators (12, 14, 18, 20) is assigned one of the energy supply devices (24, 32, 40) as a secondary source that is not assigned to it as a primary source.

3. The electromechanical braking system as claimed in any one of the preceding claims, characterized in that at least one of the actuators (12, 14, 18, 20) has a primary energy absorption device (30) and a secondary energy absorption device (38), each for connection to an energy supply device (24, 32, 40).

4. The electromechanical braking system as claimed in claim 3, characterized in that at least one of the energy absorption devices (30, 38) has a signal input for receiving a control signal for controlling the actuator (12, 14, 18, 20).

5. The electromechanical braking system as claimed in claim 4, characterized in that the energy absorption device (30, 38) having the signal input is set up to receive power that is less than the power that the other energy absorption device (30, 38) is set up to receive.

6. The electromechanical braking system as claimed in any one of the preceding claims, characterized in that at least one of the actuators (12, 14, 18, 20) is assigned a recuperation device (46) as a secondary source.

7. The electromechanical braking system as claimed in any one of the preceding claims, characterized in that at least one of the actuators (12, 14, 18, 20) is assigned a third energy supply device (40) as a secondary source.

8. The electromechanical braking system as claimed in any one of the preceding claims, characterized in that one of the connections between one of the actuators (12, 14, 18, 20) and the energy supply device (24, 32, 40) assigned to it as a secondary source has a direct electrical connection.

9. The electromechanical braking system as claimed in any one of the preceding claims, characterized in that one of the connections between one of the actuators (12, 14, 18, 20) and the energy supply device (24, 32, 40) assigned to it as a secondary source has a control device (48) for controlling and / or regulating an energy flow between the secondary source and the actuator (12, 14, 18, 20).

10. The electromechanical braking system as claimed in any one of the preceding claims, characterized in that the first actuators (12, 14) are arranged on at least one front axle (16) of the vehicle, wherein the first actuators (12, 14) are assigned the first energy supply device (24) as the primary source, and in that the second actuators (18, 20) are arranged on at least one rear axle (22) of the vehicle, wherein the second actuators (18, 20) are assigned the second energy supply device (32) as the primary source.

11. The electromechanical braking system as claimed in any one of the preceding claims, characterized by a control device for controlling the energy absorption of the braking devices and / or for controlling a braking force of the braking devices.

12. An actuator (12, 14, 18, 20), in particular an electromechanical braking device for an electromechanical braking system, having a primary energy absorption device (30), a secondary energy absorption device (38), each for connection to an energy supply device (24, 32, 40), and a controllable selection device for selecting one of the energy supply devices (24, 32, 40) for supplying the actuator (12, 14, 18, 20) with electrical energy.

13. The actuator as claimed in claim 12, characterized in that the selection device is set up, in the event of a malfunction of the energy supply device (24, 32, 40) connected to the primary energy absorption device (30), to select energy from the energy supply device (24, 32, 40) connected to the secondary energy absorption device (38) for use by the actuator (12, 14, 18, 20).

14. A vehicle, in particular a utility vehicle, wherein the vehicle has an electromechanical braking system as claimed in any one of claims 1 to 11 and / or an actuator as claimed in claim 12 or 13.

15. The vehicle as claimed in claim 14, characterized in that the vehicle has an electric drive.

16. The vehicle as claimed in claim 15, characterized in that the vehicle has a traction battery and / or a fuel cell.

17. A trailer for a utility vehicle, wherein the trailer has an electromechanical braking system as claimed in any one of claims 1 to 11 and / or an actuator as claimed in claim 12 or 13.

18. A utility vehicle combination, characterized in that the utility vehicle combination has a vehicle as claimed in any one of claims 14 to 16 and at least one trailer as claimed in claim 17.