Zf Friedrichshafen Ag

Hans Höfler

Wolfgang Rebholz

Thomas Kurz

Andreas Schwarz

Matthias Duller

Joachim Sauter

Norbert Brugger

Karl Kühner

A method of starting or holding a mobile vehicle and, in particular, a working machine. The method determines whether the vehicle is rolling backward on an inclined surface and, as a function of that knowledge, the rotational speed of the drive engine is increased, or a downshift by one gear is carried out in the transmission.

Method for starting a mobile vehicle

A rotational speed-regulated internal combustion engine in a working machine, for example a wheel loader, shortly before the engaging a bridging clutch of a hydrodynamic torque converter, is switched over in such manner that the internal combustion engine operates under torque regulation when the bridging clutch of the hydrodynamic torque converter is engaged.

Method for operating a drive train

A method of transmitting power of an inching clutch of a working machine, the power transmitted by the inching clutch is determined and the transmitted power exceeds a predefined inching clutch power, first the rotational speed of the drive engine is reduced and then the torque, that can be transmitted by the inching clutch, is reduced.

Method for transmitting power of an inch clutch

A method and a device for controlling functions of an occupational vehicle () comprising a driving motor (), a clutch (), a service brake () that acts upon the wheels () of the vehicle, a working device (), and a hydraulic pump () which supplies the actuators () of the clutch (), the service brake (), and the actuators () of the working device () with pressure, via hydraulic pressure pipes. In order to reduce the fuel consumption, distribute in an optimal and user-relevant manner, the hydraulic pressure generated by the pump (), and facilitate operation of such a vehicle, the clutch () is automatically opened and the service brake () is automatically closed when the load acting upon the working device () of the vehicle exceeds a preset threshold or is actuated so as to exceed the threshold.

Method and device for controlling functions of an occupational vehicle

A clutch () is arranged between the drive engine () and the hydrodynamic torque converter (), which is actuated partially in the opening direction during the reversing process to influence the reversing time in a working machine, such as a wheel loader or a floor-level conveyor vehicle.

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Immenstaad am Bodensee, Germany

Hans Höfler