Abstract: A method of determining an initial pressure prevailing between a master brake cylinder and an inlet valve of a wheel brake cylinder of a motor vehicle determines the initial pressure taking into consideration the variation of a voltage of a PWMoperated motor of a pump, which is used for the return delivery of brake fluid from a low-pressure accumulator into the master brake cylinder. Several characteristic quantities of the voltage variation are measured and converted to respective initial pressure values. The characteristic quantities or the initial pressure values determined therefrom are filtered or conditioned in the event of lack in quality or reliability of the measured characteristic quantities. The respective initial pressure values of similar size are averaged, and the averaged initial pressure values are temporally averaged in order to dampen fluctuations.

Abstract: In a brake-by-wire system, upon application of the brake pedal (3), the actuator (55) will deactivate the device (5), which connects and disconnects the simulator, during a predefined switching time (T2-T3). The movement of the brake pedal (3) in the direction of actuation, which movement occurs during the switching time, or the reaction of the connecting and disconnecting device (5), which reaction is caused by movement of the brake pedal (3), is sensed and evaluated.

Abstract: A method of determining an initial pressure which prevails between a master brake cylinder and an inlet valve of a wheel brake cylinder of a motor vehicle brake system. It determines the initial pressure taking into consideration the variation of a follow-up voltage of a clock-operated motor of a pump, which is used for the return delivery of brake fluid from a low-pressure accumulator into the master brake cylinder. Several characteristic quantities of the voltage variation are measured and in each case taken into account to determine an initial pressure value, and the quality and/or reliability of the measured characteristic quantities is evaluated. The characteristic quantities and/or the initial pressure values determined therefrom are filtered and/or conditioned in the event of lack in quality and/or reliability of the measured characteristic quanitites.

Abstract: Disclosed is an electronic control method for a slip-controlled motor vehicle brake system (1), featuring a distributor device (5) with an electronic unit (7,ECU) and hydraulic unit (6,HCU) having a housing body for hydraulic components, such as electrohydraulic inlet and outlet valves (9,10) for wheel brakes (8) organized in brake circuits, and with a motor-pump-aggregate with an electric motor (15) for redirecting hydraulic fluid from wheel brakes (8) in the direction of a pressure sensor (3). Antilock control is facilitated through the build-up, maintenance and release of pressure in the electrohydraulic inlet and outlet valves (9,10), while the admission pressure input by the driver is analyzed by means of the pressure sensor (3) in the brake system.