Continental Teves, Ag and Company Ohg

Michael Stein

Jochen Zimmermann

Dieter Burkhard

Joachim Borneis

Method for determining a model upstream pressure (P) using a mathematical model in a motor vehicle brake system. An electrically controllable hydraulic valve () control brake pressure on a wheel brake. Wheel sensors () provide a vehicle speed signal. From the vehicle speed signal (v) generating at least a first low pass filtered vehicle speed signal (V, V, V) for using with a first limit frequency (f, f, f), from whose time profile the point in time (t) of a significant decrease is detected, used for determining a time duration (Timer) starting with deceleration of the vehicle, which ends at the onset of regulation of the braking process. For the classification of the actuation speed of the brake pedal () the time duration (Timer) is compared with one or more threshold values (SW, SW). Depending on the comparison, determining a model upstream pressure (P) using the mathematical model.

Method for determining a model upstream pressure by means of a mathematical model in an electronically regulated motor vehicle brake system

A method and system for measuring pressure in a pressure regulation unit of a motor vehicle braking system, without using pressure sensors and having a motor pump unit with an electric motor and a hydraulic pump. The steps include producing a relative motor characteristic diagram for a series of the units. The diagram includes the data of motor-rotational-speed-dependent parameters, intensity of the motor actuation, and parameters relating to the level of the motor load. Further steps include; determining individual motor characteristic variables, determining a current rotational-speed-dependent parameter of an individual motor during the operation of the pump, and calculating a pressure which is characteristic of the braking system, by means of the diagram parameter of the individual motor and the value of the current motor actuation which determines the intensity of the motor actuation, wherein the individual motor characteristic variables are taken into account.

Method for measuring pressure in a pressure regulation unit of a motor vehicle braking system, and a motor vehicle braking system in which the method is implemented

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Idstein, Germany

Michael Stein