Zf Friedrichshafen Ag

Matthias Dietlmeier

Michael Sohler

Kai Leingruber

Gerd Muellerschoen

A method for operating a motor vehicle with a prime mover (), a transmission (), a driven end (), and a parking lock system () is provided. A shift element () of the transmission () and a parking lock actuator () of the parking lock system () utilize a common pressure control. When the shift element () is actuated with the aid of a pressure control effecting an at least partial engagement of the shift element () and when the pressure control is less than a limiting value for holding the parking lock system () in the disengaged position, the method includes monitoring a parking lock sensor () to determine whether the parking lock sensor () detects a movement of the parking lock actuator () or a signal corresponding to the movement of the parking lock actuator () despite a parking lock detent () having been actuated for locking.

Method and control unit for operating a motor vehicle

A method for operating an automatic transmission with resistance change in a control system of the automatic transmission includes detecting an electrical resistance increase in a control loop for a shift element actuator of the automatic transmission, adjusting an electrical current to the shift element actuator in response to the electrical resistance increase, and shifting the automatic transmission to a gear in which the shift element is in the open operating state. A related control device for an automatic transmission is also provided.

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Friedrichshafen, Germany

Matthias Dietlmeier