Brake system, vehicle and method for operating a brake system

1 . A brake-by-wire brake system for a vehicle having at least two wheels which can be braked, comprising:

at least two brake actuator units, each of the two brake actuator units having a brake actuator assigned to one of the wheels, which can be braked, for braking the vehicle during a driving operation,

a driver brake actuation unit for actuation by a driver for a braking operation, the driver brake actuation unit having at least one sensor for detecting an activation of the driver brake actuation unit by the driver,

at least one electronic control unit of the brake system which is configured, during normal operation, to activate one or more brake actuator units in order to impart a braking force to an associated wheel,

wherein the driver brake actuation unit is coupled, for transmission of signals, to the at least one electronic control unit of the brake system, and

wherein the driver brake actuation unit has an interface for a controller that is independent of the brake system,

wherein the controller that is independent of the brake system is a vehicle controller that during normal operation, performs a vehicle function other than braking and is not part of the brake system, and is configured to activate the brake actuator units only in a fallback operating mode when activation of the brake actuator units by the at least one electronic control unit of the brake system is impaired.

2 . The brake system according to claim 1 , wherein the driver brake actuation unit comprises at least two sensors, wherein one sensor is assigned to the control unit such that the control unit can receive an output signal from the sensor, and a further sensor is assigned to the interface such that an output signal from the sensor can be transmitted via the interface.

3 . The brake system according to claim 2 , wherein the sensor assigned to the controller is configured to provide, at the interface, those parameters which are also available to the control unit during the normal operation of the brake system.

4 . The brake system according to claim 1 , wherein the brake system has at least one further interface for the controller, wherein a communication line runs from at least one brake actuator unit to the further interface.

5 . A vehicle having a brake-by-wire brake system according to claim 1 , wherein the vehicle controller is configured to control a non-braking vehicle function during normal operation, and which is connected via the interface of the driver brake actuation unit, for transmission of signals, to the brake system and which is configured to activate the brake actuator units in the fallback operating mode.

6 . The vehicle according to claim 5 having a brake system, that has at least one further interface for the vehicle controller, wherein a communication line runs from at least one brake actuator unit to the further interface, wherein the vehicle controller is connected via the further interface, for transmission of signals, to the brake actuator units.

7 . The vehicle according to either one of claim 5 , wherein the vehicle controller is coupled via a communication line to the at least one control unit of the brake system.

8 . The vehicle according to claim 5 , wherein the vehicle controller is a central controller of the vehicle.

9 . The vehicle according to claim 5 , wherein the brake system comprises at least one energy supply unit which is configured to supply energy to the at least one control unit and/or at least one brake actuator unit, and the vehicle comprises at least one further energy supply unit which is configured to supply energy to the vehicle controller.

10 . The brake system according to claim 1 , wherein the sensor, the control unit and/or the energy supply of the brake actuator units are provided in each case in redundant form.

11 . A method for operating a brake-by-wire brake system according to claim 1 , wherein parameters are detected, and transmitted to the control unit, by the at least one sensor of the driver brake actuation unit, and the control unit activates the brake actuator units on the basis of the transmitted parameters, and wherein, if an activation of the brake actuator units by the control unit is impaired, those parameters which are available to the control unit during normal operation are provided at the interface for the vehicle controller that is independent of the brake system.

12 . The brake system according to claim 2 , wherein the brake system has at least one further interface for the vehicle controller, wherein a communication line runs from at least one brake actuator unit to the further interface.

13 . The brake system according to claim 3 , wherein the brake system has at least one further interface for the vehicle controller, wherein a communication line runs from at least one brake actuator unit to the further interface.

14 . The vehicle according to claim 6 , wherein the vehicle controller is coupled via a communication line to the at least one control unit of the brake system.

15 . The vehicle according to claim 7 , wherein the vehicle controller is a central controller of the vehicle.

16 . The vehicle according to claim 15 , wherein the brake system comprises at least one energy supply unit which is configured to supply energy to the at least one control unit and/or at least one brake actuator unit, and the vehicle comprises at least one further energy supply unit which is configured to supply energy to the controller.

17 . The brake system according to claim 13 , wherein the sensor, the control unit and/or the energy supply of the brake actuator units are provided in each case in redundant form.