Zf Friedrichshafen Ag

Manfred Sieger

Eckehard Münch

Andreas Schwarz

Mauro Cesar Zanella

Uwe Heitz

Norbert Sommer

Jörg Geis

Joerg Geis

Karl Kühner

J&ouml;rg Geis

Karl K&uuml;hner

Eckehard MÜNCH

The shift sequence for a transmission ratio change of a vehicle drive train is determined depending on an operating state of the vehicle drive train existing upon the actual transmission ratio of the transmission device. The operating state is characterized by various operating state quantities of the vehicle drive train, which represent input quantities of a model representing the vehicle drive train. Output quantities of the model supply at least one target value that determines the shift sequence in terms of characterization and application as input quantities of an optimization routine, by which a minimization of the functional connection of at least one target value is carried out. The torque characteristics representing the shift sequence of devices of the vehicle drive train are determined depending on the minimum of the functional connection of at least one target value, taking into account the limits of the operating state quantities.

Method for determining the shift sequence of a change of transmission ratio of a transmission device in a vehicle drive train

A method of determining displacement of a radial piston machine () having adjustable eccentricity (e). The radial piston machine () includes cylinders () arranged in a pivoting manner and a drive shaft that drives an eccentric (). The rotation angle of the drive shaft is labeled as &#x3b1; and the pivoting angle of the cylinders () is labeled &#x3b2;. The pivoting angle &#x3b2; is measured and from the measured values for the pivoting angle &#x3b2;, the eccentricity (e) and hence the displacement (v) are calculated.

Method for determining the displacement of a radial piston machine

A mobile vehicle comprising a shiftable transmission with fixed gear ratio steps and a controllable friction clutch contains a distance sensor, which is connected to an inch pedal and in which the starting position and the end position of the inch pedal are adjusted by an electronic control unit and allocated to an inch effect from 0% to 100%. Due to the electronic adjusting process of the inch pedal path via the inch effect and the service brake, the intersecting time between the service brake and the actuating force of the clutch can be adjusted. The driving comfort of the vehicle is increased and the risk of damage to the multi-disk clutch is reduced.

Mobile vehicle comprising a friction clutch and an inch pedal

The invention is based on a process for determination of a coefficient of friction (&mgr;) of a hydraulically activated coupling ( ) or brake ( ) in a load-shifting transmission ( ). It is proposed that a drive shaft ( ) of the transmission ( ) be driven with a specified torque (T), that an output shaft ( ) of the transmission ( ) is blocked with a closed coupling ( ) or brake ( ) during a calibration run, the activation pressure (p) of coupling ( ) or brake ( ) is reduced in accordance with a specified course over time, the differential rotational speed (&Dgr;n) between the input ( ) and the output ( ) of the coupling ( ) or brake ( ) is recorded, the activation pressure (p) is ascertained in which the differential rotation speed (&Dgr;n) is greater than zero and a separation coefficient of friction (&mgr; ) is computed on the basis of torque (T), activation pressure (p) and a construction-conditioned coupling constant. By ascertaining the coefficient of friction &mgr;, the shifting can be conducted over the lifetime of the transmission ( ) with a constant shift quality.

Method for determining a friction value

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Freudenstadt, Germany

Manfred Sieger