Zf Friedrichshafen Ag

Bernd Aumann

Hugo Burkhart

A method for controlling a desired speed of a vehicle having a retarder operating in an overrun condition is proposed, such that the desired speed of the vehicle is controlled by a continuously adjustable retarder braking system and/or an engine braking control system.

Method for controlling the desired speed in an overrun condition for a vehicle comprising a retarder

A method for activating and deactivating the four-wheel drive of a service or a working vehicle not having interaxle differential locks. According to the method, the activation and deactivation of the four-wheel drive is derived from at least one of the following parameters, namely, the driving and load conditions of the vehicle (), the vehicle speed and the output torque of the gearbox.

Method for activating and deactivating the four-wheel drive of service and working vehicles without interactive differential locks

A method for automatically actuating longitudinal blocks in four-wheel vehicles, particularly in working machines and service vehicles. The longitudinal blocks are always open when driving situations occur in which the blocking effect is absolutely unnecessary. The longitudinal blocks are closed in all other situations.

Method for automatically actuating longitudinal blocks in four wheel drive vehicles, in particular in working machines and service vehicles

In a drive train for a working machine, in particular, a wheel loader, the driving speed is preselected via a driving pedal () and the working hydraulic system is actuated via a selector lever (), whose signals are fed to an electronic control unit () which regulates a drive engine () and a clutch () arranged between the drive engine () and a pump impeller () of a hydrodynamic torque converter in such a manner that an auxiliary drive () for a pump () of the working hydraulic system is operated at a sufficient speed, while the preselected driving speed is not exceeded.

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Amtzell, Germany

Bernd Aumann