Robert Boschgmbh

Knorr-bremse Systeme Fuer Nutzfahrzeuge Gmbh

Bernhard Schwendemann

Werner Stumpe

Matthias Horn

Andreas Schlichenmaier

Juergen Wrede

Michael Herges

Heinz Kaechele

Martin Blanc

Andreas Seiche

Volker Graf

Jurgen Knott

The invention relates to a pressure medium-actuated brake system of a tractor-trailer combination comprising at least one first brake circuit and one second brake circuit. The inventive brake system contains a multiple-circuit braking power sensor, which is connected to a first compressed-air reservoir for the first brake circuit and to a second compressed-air reservoir for the second brake circuit. The brake system also contains an electronic controlling and regulating unit, a control valve device and a tractor protection valve, which can be brought into connection with at least one compressed-air reservoir and via which a brake pressure for a brake system of the trailer can be controlled. The invention provides that at least the multiple-circuit braking power sensor and the control device are placed in immediate proximity to one another and are combined to form a modular unit.

Pressure medium-actuated brake system of a tractor-trailer combination

In a vehicle having a duty brake and a sustained-action brake (retarder), the actual braking moment produced by the sustained-action brake, as well as the braking command of the driver, are taken into consideration in the electrically controlled adjustment of the duty brake.

Method and apparatus for controlling the brake system of a vehicle

An electronic control unit adjusts the pressure in the brake cylinders of at least one axle during the braking process on the basis of measured static and dynamic loads at the other axle.

Process and apparatus for controlling the brake system of a vehicle

The onset and the end of the braking action, especially the braking action of the component vehicles of a combination vehicle, are determined on the basis of the course of the deceleration of the vehicle. On the basis of the values found for the onset and end of the braking action, the hysteresis between the component vehicles is compensated, so that the braking action begins and ends at essentially the same time at all the wheel brakes.

During one or more braking processes, the application pressures of the wheel brakes and the characteristic brake values of the wheel brakes of at least one axle are determined. The application pressure represents the beginning of brake action at the wheels and can be determined from an inflection point in the curve representing brake pressure at the wheels as it increases in response to a driver's command, and further from the wheel velocity or a derivative thereof. The characteristic brake values are determined based on the brake pressure, the application pressure, and the deceleration of the vehicle. The application pressures and the characteristic brake values are stored for use in subsequent brake actions, in order to control the brakes so that wheels at each axle are uniformly braked.

Process and apparatus for determining the application pressures and

At least one measurement device detects the wheel load or axle load of the vehicle on at least one wheel, and an electronic control unit produces control signals for the wheel brakes at least as a function of the braking demand from the driver and of the detected wheel load or axle load selecting from characteristic brake pressure profiles the profile prescribing the required brake pressure based on driver's braking demand and the load state of the vehicle determined from the load state of the wheel or of the axle, and controlling the brakes in accordance with this profile during the braking process.

Method and apparatus for regulating the brake system of a vehicle

A method and apparatus for calculating the axle load on a motor vehicle having at least one axle, wherein the axle is coupled to the vehicle body, or the like, by a spring assembly. The frequency of the vibrations of the vehicle body opposite the axle that occur when driving are measured. The frequency measurements are in turn used to calculate a first axle load. A second axle load is calculated based on the displacement of the vehicle body relative to the axle due to the axle load. The first and second axle loads are evaluated to calculate a final axle load.

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Schorndorf, Germany

Bernhard Schwendemann