Zf Friedrichshafen Ag

Alexander Pfau

Thomas Lemp

Anton Fritzer

Tobias Zollner

Patrick Peter

Tobias Zöllner

Stefan Gierer

A method of operating a vehicle hybrid drive-train in which, depending on the operating situation, the engine and electric machine either operate individually or together. The engine and the electric machine can be coupled or separated by a clutch. The engine can be started by the electric machine or a separate starting device. To co-ordinate transmission shifts and required engine starts, during a transmission shifting process, if the engine needs to be started, then based on whether the shift is an upshift, a downshift, a traction shift or an overdrive shift and also depending on the type of engine start required, it is first determined whether the shift should be completed, at least partially completed or discontinued before carrying out the start and, based on this determination, measures for continuing, at least partially continuing or discontinuing the shift process are initiated.

Method for operating a hybrid drive train of a vehicle

A method of accelerating decoupling of the starting clutch () that is able to connect the electric machine () to the transmission input in a hybrid drive-train of a motor vehicle, when a decoupling command is issued, at the same time as the regulation of the starting clutch begins for the purpose of decoupling the starting clutch () or a specified time after the regulation of the starting clutch begins. The electric machine is regulated in such manner that a torque is built up such that the transition to sliding friction, and thus decoupling and the onset of slip, are sped up while maintaining the nominal driving torque.

Method for accelerating the decoupling of a starting clutch, which releasable connects an electric machine to a transmission input, in a hybrid drive train of a vehicle

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Fronreute, Germany

Alexander Pfau