Robert Boschgmbh

Martin Pfau

Eberhardt Schunck

Dirk Hofmann

Juergen Binder

Andreas Kaessmann

Anton Van Zanten

Wolf-Dieter Jonner

Ulrich Gottwick

Peter Dominke

Juergen Hachtel

Michael Schubert

Ortwin Engfer

Ewald Stuible

Frank Sager

Walter Berger

Jurgen Binder

Heinz-Jurgen Koch-Ducker

The invention relates to a hydraulic vehicle brake system ( ), having a hydraulic pump ( ) and a high-pressure hydraulic reservoir ( ) for external-force braking, as well as a conventional master cylinder ( ), which serves as a set-point brake force transducer for the external-force braking and serves the purpose of muscle-powered secondary braking if the external-force service brake system fails. To embody the vehicle brake system ( ) with an active pedal travel simulator, the invention proposes connecting the master cylinder ( ) to a low-pressure hydraulic reservoir ( ) via a disconnecting valve ( ) and to the high-pressure hydraulic reservoir ( ) via a return valve ( ).

Hydraulic vehicle brake system

The invention proceeds from a system for detecting a condition of the wheels of a motor vehicle. For this purpose, means are provided for generating rpm signals, which represent the rotational movements of the wheels, and evaluation means, by means of which a signal is outputted in dependence upon the generated signals, which signal represents the display-relevant condition. The essence of the invention is that the evaluation means are so configured that, first, and dependent upon the generated rpm signals, first difference values are formed for the rpm differences of at least two vehicle wheels on the two sides of the vehicle. Depending upon a first comparison of the formed difference values to each other and/or to pregivable first threshold values, the signal, which represents a display-relevant condition, is outputted. With the invention, one obtains a very simple and cost-effective wheel condition detection (emergency wheel detection, tire air loss detection) which operates correctly also when the vehicle drives through a curve.

System for monitoring tire status

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

Hydraulic brake system for a vehicle

The invention relates to a hydraulic motor vehicle power brake system having a hydraulic pump which is connected to a hydraulic reservoir as an external energy reservoir and is connected to wheel brake cylinders, wherein the wheel brake cylinders are preceded by inlet valves and are followed by outlet valves. To improve the adjustability of a desired brake pressure in the wheel brake cylinders and to cut costs, the inlet and outlet valves are identical as continuous pressure limiting solenoid valves or as continuous pressure differential solenoid valves.

Vehicle power brake system including a motor driven hydraulic pump

Anti-locking control system

Method of error recognition for rotary speed sensors

Wheel speed sensor signals are monitored to determine whether physically impossible values of change in wheel speed occur during wheel acceleration. Changes are compared to two different comparison thresholds which are brought into effect alternately depending on whether the wheel is found to be accelerating continuously or not.

Method for filtering a wheel speed signal

Growing community of inventors

Weissach, Germany

Martin Pfau