Braking system for an electric motor vehicle

Abstract

The invention relates generally to a braking system, in particular for a motor vehicle with an electric drive, as well as to a motor vehicle with such a braking system. The braking system can comprise at least one front wheel brake and one further rear wheel brake, as well as at least one brake control unit. At least one front wheel brake and / or one rear wheel brake can be designed as a regeneratively actuated wheel brake without a friction function.

Description

The invention relates generally to a brake system, in particular for a motor vehicle with an electric drive, and to a motor vehicle with such a brake system.Brake-by-wire brake systems are becoming increasingly widely used in vehicle technology. These are understood to mean brake systems which can be operated partially or completely without operating fluids, for example brake fluid.With respect to the wheel brakes, it may be provided in this case to configure individual wheel brakes as electromechanical (dry) brakes. In this way, for example, the wheels assigned to the front axle of a motor vehicle can be equipped in a conventional manner with known hydraulic brake components as front wheel brakes, and the rear wheel brakes can be designed as electromechanical brakes. The respective hydraulic or electromechanical wheel brake can be designed as a disc brake or as a drum brake, wherein a friction lining can be pressed against a friction partner for braking in each case.A brake system, also referred to as a hybrid brake system, is specified, for example, in the document DE 10 2009 041 449 A1 by the applicant.Even if brake systems with electromechanical wheel brakes offer many advantages, for example a saving in hydraulic components which are complicated to mount and operate, such wheel brakes are also complex and therefore cost-intensive systems.The complexity of electromechanical wheel brakes and can lead to a higher weight of these components and thus also to a higher total weight of the motor vehicle, which can be disadvantageous particularly with regard to electrically driven motor vehicles with a heavy battery.The use of friction brakes in general can also lead to dust loads from the friction partners.In addition, in friction brakes, the friction partners are subject to a certain degree of wear during operation, which can lead to corresponding subsequent costs.Accordingly, braking systems which reduce or ideally do not have these disadvantages are desirable.The inventors have assumed this task.Surprisingly simply, this object is achieved by a brake system, in particular for a motor vehicle having at least four wheels, and a motor vehicle having a corresponding brake system according to one of the independent claims. Preferred embodiments and developments of the invention can be taken from the respective dependent claims.The invention accordingly relates in a first aspect to a brake system, in particular for a motor vehicle having preferably at least four wheels, wherein at least two wheels are assigned to a first axle and two further wheels are assigned to a further, second axleat least one front wheel brake which is assigned to the first axle, at least one rear wheel brake which is assigned to the second axle, wherein the at least one front wheel brake is designed for braking at least one of the wheels of the first axle,wherein the at least one rear wheel brake is configured to brake at least one of the wheels of the second axle, at least one brake control unit,wherein the brake control device is designed to actuate the at least one front wheel brake and / or the at least one rear wheel brake, andwherein at least one front wheel brake and / or at least one rear wheel brake is designed as a wheel brake that can be activated regeneratively alone, in particular without a friction function.A motor vehicle in the sense of the invention means a vehicle having axles, wherein at least one of these axles can comprise at least one, preferably at least two steerable wheels and, in addition, the drive of the wheels of at least one axle can be adjusted in a wheel-specific manner. The motor vehicle advantageously has an electric drive.In a two-axle motor vehicle, the first axle can relate to the front axle and the second axle can relate to the rear axle. Accordingly, a wheel brake associated with the first axle can also be referred to below as a front wheel brake and a wheel brake associated with the second axle as a rear wheel brake. The present invention is, however, also suitable in principle for motor vehicles having more than two axles. The present invention is also suitable in principle for motor vehicles having two or more than two axles, wherein one axle can also have only one wheel.The front wheel brake can accordingly be designed for braking at least one of the wheels of the first axle, preferably both or all of the wheels of the first axle. Accordingly, the rear wheel brake can be designed for braking at least one of the wheels of the second axle, preferably both or all of the wheels of the second axle.The brake system according to the invention can furthermore comprise at least one brake control unit, wherein the brake control unit can be designed to actuate the at least one front wheel brake and / or the at least one rear wheel brake.According to the invention, at least one front wheel brake and / or at least one rear wheel brake can be designed as a wheel brake that can be actuated only regeneratively without a friction function. This means that for the wheel brake that can be actuated regeneratively alone, in particular no friction partners can be provided for exerting a friction brake, but instead the generation of a desired braking torque of the wheels of this axle takes place solely by means of recuperation. A wheel brake which can be actuated only regeneratively on a wheel or on an axle is to be understood in the sense of the invention to mean that no further wheel brakes are provided on this wheel or on this axle. In other words, a wheel brake that can be actuated only regeneratively means the presence of only a single wheel brake on the wheel or on the axle, which is correspondingly configured only for recuperation.Regenerative braking or recuperation means that kinetic energy of the motor vehicle can be converted into electrical energy during a generator operation of the electrical machine by means of an electrical machine or an electric motor which can be used for recuperation, as can be the case, for example, in motor vehicles having an electrical drive. The converted electrical energy can then be used to supply an electrical energy store, typically a vehicle battery or a capacitor. This conversion of the kinetic energy of the motor vehicle into electrical energy is also referred to as (electrical) recuperation. For recuperation, a recuperation torque is typically set on the electric machine, which counteracts the movement of the motor vehicle and decelerates or brakes it.The recuperation by means of the electric drive can be used, for example, when a brake pedal is actuated, for decelerating the motor vehicle. In the case of brakes, also referred to as brake recuperation, a recuperation torque or a recuperation power is set during a vehicle brake actuation, for example as a function of a brake pedal travel or a brake pedal force as a function of the actuation by a driver, during the actuation of a brake pedal.The invention is based on the underlying idea that for braking a motor vehicle, in particular a motor vehicle with an electric drive, friction brakes need not be provided on all axles present, in particular not on more than one axle. In other words, only the wheel brakes of one axle can comprise friction brakes, while the wheel brakes of at least one further axle of this motor vehicle do not comprise friction brakes and generate the braking torque solely via recuperation.This results in several advantages of the invention.Thus, the complexity of the brake system as a whole can be reduced, whereby the brake system according to the invention can be produced and assembled more easily.Furthermore, the total weight of the motor vehicle can also be reduced, since ideally an electric drive motor can be used as a generator for regenerative operation and therefore hardly any additional components are required to fulfil the braking function.As a result, the brake system according to the invention can also be more cost-effective.Furthermore, a contribution to dust avoidance can be made, since the friction function can be omitted at least on one axis. For the sake of clarity, the following explanations relate to two-axle motor vehicles, which should not be understood as restrictive with respect to the invention, however.According to a preferred embodiment of the invention, the wheel brake assigned to the wheels of the first axle, and therefore the front wheel brake, can be designed as a friction brake. In this embodiment, the wheel brake assigned to the wheels of the second axle, and therefore the rear wheel brake, can be designed as a wheel brake that can be actuated only regeneratively without a friction function.According to another, likewise preferred embodiment of the invention, the wheel brake assigned to the wheels of the second axle, and therefore the rear wheel brake, can be designed as a friction brake. In this embodiment, the wheel brake assigned to the wheels of the first axle, and therefore the front wheel brake, can be designed as a wheel brake that can be actuated only regeneratively without a friction function.In both of the above-mentioned embodiments of a brake system for motor vehicles, friction brakes can accordingly be completely dispensed with in the case of at least the wheels assigned to an axle of the motor vehicle.According to one embodiment of the invention, the wheel brake designed as a friction brake can be dimensioned accordingly in order to be able to generate the entire required braking torque, if appropriate. This may become necessary, for example, when the capacities of the in-vehicle energy store are exhausted, since, for example, the batteries are fully charged.The additional outlay for the formation of this friction brake that possibly results from this can, however, be compensated for in that no friction brake has to be reserved any longer for the other axle.According to one embodiment of the invention, the friction brake can be designed as a hydraulically actuatable wheel brake. Constructions as hydraulically actuatable disc brakes or also as hydraulically actuatable drum brakes are possible.According to another embodiment of the invention, the friction brake can also be designed as an electromechanically actuatable wheel brake. Constructions as an electromechanically actuatable disc brake or also as an electromechanically actuatable drum brake are possible.In principle, other embodiments of friction brakes are also possible, so that the above list is not to be understood as exhaustive.According to one embodiment of the invention, the wheel brake that can be actuated only regeneratively can be designed as an axle brake. A configuration as an axle brake can mean, within the meaning of the invention, that all wheels of this axle can be braked with only a single wheel brake. Such an embodiment is distinguished by a very low complexity of the brake system with regard to the required components and installation in the motor vehicle.Another embodiment of the invention can provide that the only regeneratively actuatable wheel brake is designed individually for each wheel. This means that a regeneratively actuatable wheel brake can be provided on each wheel of the corresponding axle.The wheel brake that can be actuated only regeneratively can, according to a preferred embodiment of the invention, be integrated into an electric drive unit or be combined with an electric drive unit. Electric drives for motor vehicles with an integrated regenerative braking function are generally known and are very well suited for the invention. As explained above, the electric drive unit can be placed very easily in a generator mode in order to achieve recuperation. In contrast to known systems, however, the additional friction brake on the respective wheel can be dispensed with according to the invention. The wheel brake that can be activated regeneratively alone and the electric drive unit can accordingly be designed for wheel-specific driving and / or wheel-specific braking of the wheels of an axle.According to a preferred embodiment of the invention, it can also be provided to provide only one wheel brake that can be actuated regeneratively alone and only one electric drive unit for the corresponding axle. This combined drive / brake unit can be placed approximately centrally between the wheels of the axle, which is not mandatory, however. Drive and braking torque can be transmitted to the individual wheels of the axle via corresponding drive shafts. This represents a particularly simple embodiment of the brake system according to the invention. According to another, likewise preferred embodiment of the invention, the combined drive / brake unit can also be designed individually for each wheel.The at least one brake control device can be designed to actuate the at least one front wheel brake and / or the at least one rear wheel brake, wherein the actuation of hydraulically actuatable wheel brakes can take place via hydraulic lines and the actuation of electromechanically actuatable wheel brakes and / or the wheel brake that can be actuated solely regeneratively can take place via signal or data lines.The brake control unit can be connected via a further signal or data line in terms of signal technology to a brake pedal for detecting a driver's braking request. In a known manner, a corresponding pedal sensor system with, for example, force and / or travel gauges can be provided for detecting an actuation by a driver.According to a preferred embodiment of the invention, the at least one brake control device can be connected to a first voltage supply and the electric drive unit can be connected to a second voltage supply separate therefrom. Separated from this can mean that two structurally and electrically separated voltage supplies or voltage sources are present, from which separate electrical lines are each routed to the brake control units. If the wheel brake that can be actuated only regeneratively is combined with this electric drive unit or integrated into it, this embodiment of the energy supply also enables operation of at least one wheel brake if a voltage supply should fail. This results in redundancy in the braking functions.According to a further, likewise preferred embodiment of the invention, a further, second brake control device can be provided, which can be connected to the first brake control device by signal technology via a data line. This second brake control device can preferably have at least the essential braking functions of the first brake control device required for safety reasons, in order to provide a corresponding redundancy. The second brake control unit can accordingly have at least the basic functions for activating the at least one front wheel brake and the at least one rear wheel brake.According to yet another, likewise preferred embodiment of the invention, it can also be provided to connect the first and / or the second brake control device via a data line in terms of signal technology to a central control unit. This central control unit can likewise comprise braking functions and / or generate braking requests and transmit them to the brake control units. In this way, functions for autonomous driving can also be integrated.In a further aspect of the invention, the invention also includes a motor vehicle comprising a brake system as set out above.Further details of the invention will become apparent from the description of the illustrated embodiments and the appended claims.The drawings show: FIG. 1 shows an exemplary architecture of a brake system according to the invention with a hydraulically actuatable friction brake on the front wheels and a wheel brake, which can be actuated only regeneratively, on the rear axle, FIG. 2 shows a further exemplary architecture of a brake system according to the invention with a hydraulically actuatable friction brake on the front wheels and in each case a wheel brake which can be actuated solely regeneratively on the wheels of the rear axle, and FIG. 3 shows yet another exemplary architecture of a brake system according to the invention with an electromechanically actuatable wheel brake on the front wheels.In the following detailed description of preferred embodiments, for the sake of clarity, like reference numerals designate substantially like parts in or on those embodiments. However, for better clarification of the invention, the preferred embodiments shown in the figures are not always drawn to scale.FIG. 1 shows an exemplary architecture of a brake system 1 according to the invention with a hydraulically actuatable friction brake on the front axle 11 and a wheel brake on the rear axle 12 that can be actuated only regeneratively.The brake system 1 can be used in particular for a motor vehicle 10. FIG. 1 shows, by way of example, a motor vehicle 10 of this type having four wheels 13, 14, 15, 16, two wheels 13, 14 being assigned to a first axle 11 and two further wheels 15, 16 being assigned to a further, second axle 12. A suitable motor vehicle can, however, also have more than two axles 11, 12. It is also possible for only one wheel 13, 14, 15, 16 to be provided on one axle 11, 12.The brake system 1 according to the exemplary embodiment shown in FIG. 1 comprisesa front wheel brake 22, which is associated with the first axle 11,a rear wheel brake 25 which is associated with the second axle 12, wherein the at least one front wheel brake 22 is designed to brake at least one of the wheels 13, 14 of the first axle 11,wherein the at least one rear wheel brake 25 is designed to brake at least one of the wheels 15, 16 of the second axle 12,at least one brake control device 20,wherein the brake control device 20 is designed to actuate the at least one front wheel brake 22 and / or the at least one rear wheel brake 25, andwherein at least one front wheel brake 22 and / or at least one rear wheel brake 25 is designed as a wheel brake 26 that can be activated only regeneratively without a friction function.The front wheel brake 22 is configured to brake the wheels 13, 14 of the first axle 11. The rear wheel brake 25 is designed for braking the wheels 15, 16 of the second axle 12. The depicted brake system 1 further comprises a brake control unit 20, wherein the brake control unit 20 is designed to actuate the at least one front wheel brake 22 and the at least one rear wheel brake 25.In the embodiment of the invention depicted in FIG. 1, the front wheel brake 22 assigned to the wheels 13, 14 of the first axle 11 is designed as a friction brake. Consequently, the rear wheel brake 25 assigned to the wheels 15, 16 of the second axle 12 is designed as a wheel brake 26 that can be actuated only regeneratively and has no friction function.In principle, a reverse arrangement of the friction brake and the wheel brake that can be actuated only regeneratively is also provided, wherein one friction brake is assigned to the wheels 15, 16 of the second axle 12 and one wheel brake that can be actuated only regeneratively is assigned to the wheels 13, 14 of the first axle 11.In the case of the wheel brake 26 that can be actuated only regeneratively, the friction function is dispensed with in the sense of the invention; that is to say, in particular no friction partners are provided for carrying out friction braking. Instead, the generation of a desired braking torque of the wheels 13, 14, 15, 16 of the associated axle 11, 12 takes place solely by recuperation. This can relate to all wheels 13, 14, 15, 16 of the corresponding axle. In the example of FIG. 1, this means that only regeneratively actuatable wheel brakes 26 without a friction function are provided for all wheels 15, 16 of the second axle 12.As can be seen from FIG. 1, the brake system 1 is distinguished by a low complexity, as a result of which the total weight of the motor vehicle 10 can also be reduced in an advantageous manner. In particular, no friction brakes or other brakes that do not act regeneratively are provided on the rear axle 12.In the exemplary embodiment of FIG. 1, the friction brake assigned to the front axle 11 is designed as a hydraulically actuatable wheel brake 23, in the example as a hydraulically actuatable disc brake. Other embodiments may also include hydraulically actuatable drum brakes.According to another embodiment of the invention, which is shown in FIG. 3 on the basis of a further exemplary embodiment, the friction brake can also be designed as an electromechanically actuatable wheel brake 24. Embodiments as an electromechanically actuatable disc brake as illustrated in FIG. 3 or as an electromechanically actuatable drum brake are also possible.In the brake system 1 shown in FIG. 1, the wheel brake 26 that can be actuated only regeneratively is designed as an axle brake. This axle brake is designed to brake all wheels 15, 16 of the associated axle 12 with only a single wheel brake. As a result, the brake system 1 can be simplified once again. In other words, the wheels 15, 16 assigned to the second axle 12 can be braked solely by a single wheel brake 26 that can be actuated solely regeneratively.Another embodiment of the invention is shown in Fig. 2. FIG. 2 shows an exemplary architecture of a brake system 1 according to the invention with a hydraulically actuatable friction brake on the front wheels 13, 14 and a regeneratively actuatable wheel brake 26 on the wheels 15, 16 of the rear axle 12, respectively. This means that a wheel brake 26 that can be activated only regeneratively is provided on each wheel 15, 16 of the corresponding axle 12.In the exemplary embodiments shown, the wheel brake 26 that can be actuated only regeneratively is integrated into an electric drive unit 30 or combined with an electric drive unit 30. This makes it possible to use known electric drives for motor vehicles with an integrated regenerative braking function for the invention.FIG. 1 shows a preferred embodiment of the invention, wherein only one wheel brake 26 that can be regeneratively operated alone and only one electric drive unit 30 are provided for the axle 12. This combined drive / brake unit is placed centrally between the wheels 15, 16 of the axle 12, which is not mandatory, however. Drive and braking torque can be transmitted via corresponding drive shafts 31 to the individual wheels 15, 16 of the axle 12. This represents a particularly simple embodiment of the brake system 1.According to another, likewise preferred embodiment of the invention, such a combined drive / brake unit is designed individually for each wheel, i.e. is assigned to a respective wheel 15, 16 of the axle 12, as shown in FIG. 2.Within the meaning of the invention, however, such an integration or combination of electric drive unit 30 and only regeneratively actuatable wheel brake 26 is not absolutely necessary. Rather, other arrangements and designs are also possible, for example an arrangement with an axle drive unit which is designed to drive the wheels of an axle 11, 12 and wheel brakes 26 which are individual to the wheel and can be actuated only regeneratively on the wheels 13, 14, 15, 16 of this axle 11, 12.In the example of FIG. 1, the brake control unit 20 is designed to actuate the hydraulically actuatable wheel brakes 23 via hydraulic lines 21. For activating the wheel brake 26 that can be activated regeneratively alone, corresponding signal or data lines 72 are provided. In this exemplary embodiment, brake control unit 20 is configured to convert signals of a brake pedal 17, which relate to the detection of the driver's braking request, into corresponding brake signals and to transmit them hydraulically and / or electrically to the respective wheel brakes in a known manner.Corresponding algorithms and functions for determining the brake signals can be stored in the brake control unit 20. However, as shown in the examples of FIGS. 1 and 2, signal or data lines 71 may also be provided between the brake control unit 20 and a vehicle computer or a central control unit 28. The central control unit 28 is also directly connected via data lines 71 to the wheel brake 26 that can be actuated solely regeneratively, so that the wheel brake 26 that can be actuated solely regeneratively can also receive brake signals from the central control unit 28.The brake control unit 20 is connected via a signal or data line to a brake pedal 17 for detecting the driver's braking request.If the friction brake is designed as an electromechanical wheel brake 24, as shown in the exemplary embodiment in FIG. 3, no hydraulic lines are required. The brake control device 20 is advantageously connected to the individual wheel brakes via at least two signal or data lines 71, 72 for actuation, so that there is redundancy. At least one signal or data line 71, 72 can also be provided by a vehicle bus.In order to detect the driver braking request, a corresponding pedal sensor system 18 may also be provided, which may include force and / or travel gauges for detecting an actuation by a driver, for example.In the brake system 1 shown in FIG. 3, the brake control unit 20 is designed to be at least partially redundant. This can be realized by twice the presence of at least the minimum functions within the brake control unit 20, for example by two separate printed circuit boards. In the example from FIG. 3, the redundancy in the at least safety-critical brake functions is carried out by a second brake control unit 27. A corresponding signal or data connection is provided between the two brake control units 20, 27. In addition, both brake control units 20, 27 are connected by signal technology to the pedal sensor system 18.The second brake control unit 27 comprises at least the essential braking functions required for safety reasons. The second brake control unit 27 thus has the basic functions for activating the at least one front wheel brake and the at least one rear wheel brake independently of the first brake control unit 20.In order to further increase the fail-safe, the first brake control device 20 is connected to a first voltage supply 50 and the second brake control device 27 is connected to a second voltage supply 51 separate therefrom.In the case of electromechanical wheel brakes 24 on one axle 11, as shown in FIG. 3, it is advantageous to connect the electromechanical wheel brakes 24 on this axle 11 and the wheel brakes 26 that can be activated only regeneratively on the further axle 12 to different voltage supplies 50, 51. Accordingly, the electromechanical wheel brakes 24 are supplied with a first voltage source 50 and the wheel brakes 26 that can be activated regeneratively alone are supplied with a second voltage source 51 that is separate therefrom.In a further development of the invention, it is provided to connect the at least one electromechanical wheel brake 24 not only to a voltage supply 50, 51 but to two separate voltage sources 50, 51. As a result, the operability can be increased once more, since in the event of failure of one of the voltage supplies 50, 51, at least one wheel brake still remains operational.The invention also relates to a motor vehicle 10 which has a brake system 1 as explained above.List of reference numbers:1 Brake system 10 Motor vehicle 11 Axle 12 Axle 13 Wheel, front left 14 Wheel, front right 15 Wheel, rear left 16 Wheel, rear right 17 Brake pedal 18 Pedal sensor system 20 Brake control unit 21 Hydraulic line 22 Front wheel brake 23 Hydraulic wheel brake 24 Electromechanical wheel brake 25 Rear wheel brake 26 Regenerative wheel brake 27 Brake control unit 28 Central control unit 30 Drive unit 31 Drive shaft 50 Voltage supply 51 Voltage supply 71 Data line 72 Data lineReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2009 041 449 A1

[0004]

Claims

Brake system (1), in particular for a motor vehicle (10) having at least four wheels (13, 14, 15, 16), wherein at least two wheels (13, 14) are assigned to a first axle (11) and two further wheels (15, 16) are assigned to a further, second axle (12), comprising at least one front wheel brake (22) which is assigned to the first axle (11), at least one rear wheel brake (25) which is assigned to the second axle (12), wherein the at least one front wheel brake (22) is designed to brake at least one of the wheels (13, 14) of the first axle (11), wherein the at least one rear wheel brake (25) is designed to brake at least one of the wheels (15, 16) of the second axle (12), at least one brake control unit (20, 27, 28), wherein the brake control unit (20, 27, 28) is designed to actuate the at least one front wheel brake (22) and / or the at least one rear wheel brake (25), and wherein at least one front wheel brake (22) and / or at least one rear wheel brake (25) is designed as a wheel brake (26) that can be operated solely regeneratively without a friction function.Brake system (1) according to the preceding claim, characterized in that the at least one front wheel brake (22) is designed as a friction brake, wherein the at least two wheels (13, 14) of the first axle (11) preferably each comprise a friction brake.Brake system (1) according to one of the preceding claims, characterized in that the at least one rear wheel brake (25) is designed as a friction brake, wherein the at least two wheels (15, 16) of the second axle (12) preferably each comprise a friction brake.Brake system (1) according to one of the preceding claims, characterized in that the friction brake is designed as a hydraulically actuatable wheel brake (23), preferably as a disc brake or as a drum brake.Brake system (1) according to one of the preceding claims, characterized in that the friction brake is designed as an electromechanically actuatable wheel brake (24), preferably as a disc brake or as a drum brake.Brake system (1) according to one of the preceding claims, characterized in that the wheel brake (26) which can be actuated solely regeneratively is designed as an axle brake and is configured to brake the wheels (13, 14, 15, 16) of one of the axles (11, 12) during operation, and wherein the wheels (13, 14, 15, 16) of this axle (11, 12) preferably do not comprise any further wheel brakes, in particular no friction brakes.Brake system (1) according to one of the preceding claims, characterized in that the wheel brake (26) which can be actuated solely regeneratively is designed individually for each wheel and is assigned to the wheels (13, 14, 15, 16) of one of the axles (11, 12), and wherein the wheels (13, 14, 15, 16) of this axle (11, 12) preferably do not comprise any further wheel brakes, in particular no friction brakes.Brake system (1) according to one of the preceding claims, characterized in that the wheel brake (26) which can be actuated solely regeneratively is integrated into an electrical drive unit (30) or is combined with an electrical drive unit (30).Brake system (1) according to one of the preceding claims, characterized in that the wheel brake (26) which can be actuated solely regeneratively and the electric drive unit (30) are designed for wheel-specific driving and / or wheel-specific braking of the wheels (13, 14, 15, 16) of an axle (11, 12), and wherein the wheels (13, 14, 15, 16) of this axle (11, 12) preferably do not comprise any further wheel brakes, in particular no friction brakes.Brake system (1) according to one of the preceding claims, characterized in that the hydraulically actuatable wheel brakes (23) are actuated via hydraulic lines (21).Brake system (1) according to one of the preceding claims, characterized in that the actuation of the wheel brake (26) which can be actuated solely regeneratively takes place via signal or data lines (72).Brake system (1) according to one of the preceding claims, characterized in that the at least one brake control unit (20) is connected to a first voltage supply (50) and the drive unit (30) is connected to a second voltage supply (51) separate therefrom.Brake system (1) according to one of the preceding claims, characterized in that a further, second brake control unit (27) is provided, which is connected to the brake control unit (20) by signal technology via at least one data line, and wherein the second brake control unit (27) comprises at least the safety-relevant brake functions of the brake control unit (20).Brake system (1) according to one of the preceding claims, characterized in that the first and / or the second brake control unit (20, 27) is connected by signal technology to a central control unit (28) via a data line.Motor vehicle (10) comprising a braking system (1) according to one of the preceding claims.

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