Robert Boschgmbh

Eberhard Sonntag

Bernd Grossardt

Rudiger Poggenburg

Peter Dominke

Alfred Strehle

Thomas Meier

Gebhard Wuerth

Elmar Mueller

Stefan Diehle

Claus Beyer

Ruediger Poggenburg

Rüdiger Poggenburg

An instability value for at least one wheel is derived from the detected variables such as rotational velocity of the wheels, and as a function of this instability value, the brake systems are actuated to change the brake pressure, such that in addition, the present invention can calculate a variable which modifies or represents the driving dynamics of the vehicle and wherein the instability value can be modified as a function of the calculated driving dynamics variable.

System for actuating a brake system

Wheel speeds on each side of the vehicle are added, and the sums are subtracted to form a difference VXU which is time filtered to produce a filtered difference VXG. As long as VXU does not exceed VXG by more than a speed dependent threshold, a signal indicating straight line travel is produced. This signal can be cancelled when VXG exceeds a vehicle dependent threshold and is also blocked when the vehicle speed falls below a minimum, when the ABS is operating, or when the vehicle is decelerating. The signal indicating straight line travel accounts for tire tolerance and can be used to control vehicle dynamics, for example by preventing an increase in brake pressure or engine braking when the vehicle is travelling in a curve.

Method of producing a straight-on travel signal

Method for minimizing the amplitude of pressure modulation in an ABS

In an anti-lock braking system in which pressure is reduced in pulses separated by pressure maintenance phases, the duration of the first maintenance phase is dependent upon the vehicle deceleration and the wheel slip. A second pressure reduction pulse is triggered only when the wheel acceleration is less than a predetermined low threshold.

Method for minimizing amplitude of pressure modulation in an ABS

Brake system

Anti-locking control system

Anti lock braking system

Growing community of inventors

Gerlingen, Germany

Eberhard Sonntag