Electronic evaluation device and method for estimating master brake cylinder pressure in vehicle brake system with electromechanical braking force booster

摘要

The present invention relates to an electronic evaluation device (50) for a vehicle brake system equipped with an electromechanical braking force booster (52), and a method for estimating a master brake cylinder pressure in a vehicle brake system equipped with an electromechanical braking force booster (52). This method relates to at least one first current intensity [I (t1)] of the motor current of the motor of the electromechanical braking force booster 52 at a first time and to a first rotation angle of the rotor at a first time. estimating a first output value of the master brake cylinder pressure in consideration of [φ (t1)]; Determining a correction value [Delta] _C as a difference between the first output value of the master brake cylinder pressure and the measured value [x _measured (t1)]; Taking into account one or more second current intensities I (t1 + Δt) of the motor current of the motor at the second time and the second rotation angle φ (t1 + Δt) of the rotor at the second time, Estimating a second output value of the brake cylinder pressure; Includes; said method comprising: 2 in consideration of the output value and the correction value (Δ _C), determining a first estimated value of the pressure within the master brake cylinder of the master brake cylinder 2 hours [p (t1 + Δt)] .