Control device for a braking system of a vehicle, and method for operating a braking system of a vehicle

A control device for a braking system of a vehicle, comprising:

• an activating unit that sets a first setpoint brake pressure in at least one first wheel brake cylinder of a first brake circuit of the braking system, and that sets a second setpoint brake pressure in at least one second wheel brake cylinder of a second brake circuit of the braking system, wherein the activating unit sets the first setpoint brake pressure and the second setpoint brake pressure taking into consideration an input signal regarding a setpoint vehicle deceleration, the setpoint vehicle deceleration being predefined at least one of:
• i) by a driver using an actuation of a brake actuating element of the vehicle, and ii) by an automatic speed control of the vehicle, at least one component of the braking system being controlled with the aid of the activating unit so that a first actual brake pressure present in at least the first wheel brake cylinder of the first brake circuit is variable taking into account the established first setpoint brake pressure, and a second actual brake pressure present in the at least second wheel brake cylinder of the second brake circuit is variable taking the established second setpoint brake pressure into account;
• wherein at least one of:
• (a) the first actual brake pressure is reduced according to the established first setpoint brake pressure, and the second actual brake pressure is reduced according to the established second setpoint brake pressure, the activating unit being configured to output at least one first control signal to a master brake cylinder pressure varying device, which is controlled with the aid of the at least one first control signal in such a way that a master brake cylinder pressure is set in a master brake cylinder of the braking system to be no greater than a minimum of the first setpoint brake pressure and the second setpoint brake pressure, and output at least one second control signal to at least one of a first switchover valve of the first brake circuit and a second switchover valve of the second brake circuit, the first and second switchover valves being respectively controlled with the aid of the at least one second control signal in such a way that at least one of the first actual brake pressure and the second actual brake pressure is additionally reduced;
• and
• (b) the first actual brake pressure is increased according to the established first setpoint brake pressure, and the second actual brake pressure is increased according to the established second setpoint brake pressure, the activating unit being configured to output at least one third control signal to the master brake cylinder pressure varying device, which is controlled with the aid of the at least one third control signal in such a way that the master brake cylinder pressure is set to be no smaller than a maximum of the first setpoint brake pressure and the second setpoint brake pressure, and output at least one fourth control signal to at least one of a first wheel inlet valve of the first brake circuit and a second wheel inlet valve of the second brake circuit, the first and second wheel inlet valves being respectively controlled with the aid of the at least one fourth control signal in such a way that at least one of the first actual brake pressure and the second actual brake pressure is additionally increased.