Zf Friedrichshafen Ag

Peter Spoerl

Franz-Josef Schuler

Detlef Plath

Peter Schiele

Bernd Allgaier

Friedemann Jauch

Johannes Kemler

Walter Hecht

A method for operating a motor vehicle, the motor vehicle including a prime mover (), a transmission (), and a driven end (), wherein the transmission () is an automatic or automated transmission and is connected between the prime mover () and the driven end (). The method includes activating a sailing mode of the motor vehicle depending on at least one operating condition of the motor vehicle; performing a gear select interlock in the transmission (), while maintaining the sailing mode, when the sailing mode is active; and deactivating the sailing mode is subsequently depending on at least one operating condition of the motor vehicle. The gear select interlock is implemented in the transmission () depending on a rotational speed of the prime mover () and depending on synchronous speeds of the gears of the transmission ().

Method and control device for operating a motor vehicle

A selector lever for a transmission of a vehicle may include a monostable control element. Actuation of the monostable control element, without moving the selector lever, may triggers engagement of a parked position of the transmission when the transmission is not in the parked position and the drive motor is running. Further, actuation of the monostable control element may trigger a start process of the drive motor when the drive motor is off. Further, actuation of the monostable control element may trigger a shutdown process of the drive motor when the transmission is in the parked position and the drive motor is in on.

Selector lever for an automatic transmission or an automated manual transmission of a motor vehicle

A method for operating an automatic transmission of a motor vehicle, whereas the automatic transmission features several interlockable shifting elements, involves determining, from the data made available from the driving operation of the motor vehicle, a change to consumption of the motor vehicle expected to be caused by an activated interlocking of the shifting elements and a change to the shifting dynamics of the motor vehicle expected to be caused by an activated interlocking of the shifting elements. The changes are evaluated such that, depending on the change to consumption and depending on the change to shifting dynamics, an interlocking of the shifting elements is permitted or not permitted.

Method and control device thereto for operating an automatic transmission

A method for operating a transmission of a vehicle drivetrain. A transmission ratio can be automatically changed during an operating state depending on a comparison of current operating state parameters with operating parameters stored in a control unit, and can be manually changed depending on a driver's request. Accordingly when the driver requests a change of the transmission ratio, the transmission ratio changes, and a timer starts. If the driver continues the ratio change from an actual transmission ratio value toward a larger or smaller transmission ratio value, the current operating parameters are compared with the stored operating parameters. Upon this comparison, the transmission shifts to higher ratios in comparison to the operating parameters stored in a control device at higher vehicle speeds, and/or a delay between sequential, cyclical transmission ratio changes varies depending on a vehicle deceleration and/or braking pressure in the region of a vehicle brake.

Method for operating a transmission unit of a vehicle driveline with an engine

A method of operating a transmission having a plurality of gears which can operate in an automatic shifting mode, during which a gear is selected automatically depending on the current driving situation, and also in a manual shifting mode during which a gear is selected depending on a driver's command. When the driver commands a shift, a change takes place from the automatic shifting mode to the manual shifting mode. A specific threshold value of the transmission output speed or an equivalent rotational speed value is associated with each gear and, when the driver commands a downshift, a target gear is determined as a function of the current transmission output speed or the equivalent rotational speed value. The gear selected as the target gear is the gear whose specific threshold value is higher than or equal to the current transmission output speed or the equivalent rotational speed value.

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Ravensburg, Germany

Peter Spoerl