Method to check for disturbances in an electronically slip-controllable brake system for a motor vehicle

A method for an electronically slip-controllable brake system of a motor vehicle, wherein the brake system includes a plurality of mutually separate brake circuits configured to supply connected wheel brakes with pressurizing medium, an actuatable pressure generator configured to charge the brake circuits with a brake pressure, sensor devices configured to generate an actuating signal quantifying an actuation of the pressure generator and to measure an actual value of the brake pressure in at least one brake circuit, and an electronic control unit configured to evaluate the signal generated by the sensor devices, the method comprising:

• determining that a disturbance exists if:
• the measured actual value of the brake pressure is less than a limiting value that is determined by the electronic control unit for a setpoint value for the brake pressure to be obtained in the brake circuits, which setpoint value is ascertained based on the actuating signal;
• or
• an actual value of a volume of the pressurizing medium that is displaced into the brake circuits, which ascertainable from the actuating signal, is greater than a limiting value that is determined by the electronic control unit for a setpoint value for the pressurizing-medium volume to be displaced into the brake circuits in order to generate the actual value of the brake pressure;
• and
• in response to the determination of the existence of the disturbance, closing inlets by which the pressurizing medium is suppliable to a first subset of the wheel brakes and subsequently performing at least one of the following two steps (a)-(b):
• (a) in response to a wheel locking pressure being reached at a second subset of the wheel brakes, reopening the inlets by which the pressurizing medium is suppliable to the first subset of the wheel brakes;
• and
• (b) based on the determination of the existence of the disturbance, performing a slip control of the second subset of the wheel brakes by switching open and close states of only inlets by which the pressurizing medium is suppliable to the second subset of the wheel brakes with no switching of states of relief valves by which the pressurizing medium is removable from the second subset of the wheel brakes, wherein the electronically slip-controllable brake system is configured to switch the states of the relief valves for the slip control when the disturbance is not determined to exist.