Robert Boschgmbh

Jurgen Binder

Ulrich Gottwick

Hermann Winner

Anton Van Zanten

Wolf-Dieter Jonner

Helmut Wiss

Juergen Hachtel

Michael Schubert

Eberhardt Schunck

Martin Pfau

Ortwin Engfer

Michael Wolf

Gunther Schmidt

Andreas Kaessmann

A hydraulic vehicle brake system in which normal service brake operation can be carried out by using external hydraulic energy, and in the event of a lack of external hydraulic energy, auxiliary brake operation by muscle power is possible, with a hydraulic transmission that comes from a master cylinder that can be actuated by means of the brake pedal. The external hydraulic energy is stored, for example, in an accumulator with a gas buffer, which can lead to a gas content in the hydraulic fluid for the service brake operation. The system includes a dual-circuit master cylinder associated with those wheel brakes of a vehicle axle that make a higher contribution to the vehicle deceleration and at the same time, cylinder/piston devices are installed between these wheel brakes and their associated service brake valves for the purpose of preventing hydraulic fluid from getting into these wheel brakes from the external energy source. The advantage is that neither gas nor air is carried into the wheel brakes where it could lead to the formation of bubbles in the event of a pressure drop and would be disadvantageous for an auxiliary brake operation by the master cylinder. The cylinder/piston devices increase the operational safety of the vehicle brake system when braking by muscle power.

Hydraulic vehicle braking system

A method and a device for controlling a braking system of a motor vehicle in open loop, in which a driver's braking input is converted into setpoint wheel-brake pressures for the individual wheel brakes, and the wheel-brake pressure is adjusted to the setpoint wheel-brake pressure in view of the measured wheel-brake pressure. Various secondary braking operations are initiated as a function of the type of fault. In response to a serious fault such as failure of the electrical energy supply, of the pressure supply, or an electrical fault in the control unit of the braking system, the valve arrangements controlling the wheel-brake pressures are switched over into a currentless state, and in response to a fault in detecting the driver's braking input, only the valve arrangements allocated to the front axle are switched into a currentless state. Furthermore, in response to a fault affecting the ability to build up or reduce pressure at only one wheel, an electrical open-loop control is implemented at only three wheel brakes, and in response to a fault which affects the ability to build up or reduce pressure at only one wheel of an axle without impairing the ability to build up and reduce pressure at this wheel, a shared control of one axle is carried out within the framework of a closed pressure-control loop.

Method and device for controlling a braking system in open loop

Process and device for determining a pressure value

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Stuttgart, Germany

Jurgen Binder