Patent Document ID: 20140350817
Application ID: 14349701
Patent Flag: 0

Claim One:
1. A method for determining a model upstream pressure (P TMC — mod ) by means of a mathematical model in an electronically regulated motor vehicle brake system, in which the regulation of an electrically controllable hydraulic valve causing a build-up of brake pressure on at least one wheel brake is carried out using the model upstream pressure (P TMC — mod ) as at least one parameter, and the brake system having wheel sensors for providing a vehicle speed signal indicating the speed of the vehicle and having a brake pedal that can be operated, comprising the steps of; from the vehicle speed signal (v ref ) generating at least a first low pass filtered vehicle speed signal by means of a at least a first low pass filter with a first limit frequency (f g1 , f g2 , f g3 ), from whose time profile a first point in time (t 1 ) of a significant decrease in speed is detected, which decrease is used as a starting criterion for determining a time duration (Timer) starting with a deceleration of the vehicle initiated by a braking process, which braking process ends at a second point in time (t 2 ) of the onset of regulation of the braking process, for the classification of an actuation speed of the brake pedal, comparing the time duration (Timer) with at least one of a first or a second threshold time value (SW 1 , SW 2 ), and depending on the result of the comparing step, determining the model upstream pressure (P TMC — mod ) by means of the mathematical model.