Zf Transmission Technologies, L.l.c.

Steffen Braun

Andreas Piepenbrink

Stefan Sommer

The invention describes a method and a device for controlling a drive train of a motor vehicle with a drive assembly and a continuously variable automatic transmission with a variable speed gear, wherein an electronic control unit for controlling at least the continuously variable automatic transmission and an emergency device are provided, with this unit being activated in the event of failure of the electronic control unit and a constant pressure/force ratio being established in the variable speed gear. Pursuant to the invention, in the event of failure of the electronic control unit the frictional connection between the drive assembly and the continuously variable automatic transmission is interrupted before the emergency driving mode is made available through the emergency device by re-establishing the frictional connection.

Growing community of inventors

Langenargen, Germany

Steffen Braun