Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Joerg-Michael Birkhold

Nils Sauvlet

Martin Fuechtner

Markus Oel

A motor vehicle has an internal combustion engine and at least one electric motor as a drive motor arranged on a common shaft. The internal combustion engine and/or the electric motor can introduce torque into a transmission downstream in the drivetrain, and a separating clutch is provided between the internal combustion engine and the electric motor. The method increases torque of the electric machine, increasing the rotational speed of the electric machine and setting slip conditions at a clutch of the downstream transmission, engaging the separating clutch to a torque between the reserve torque of the electric motor and the maximum transmissible torque, reducing the transmissible torque of the separating clutch when the rotational speed of the internal combustion engine has reached the ignition rotational speed, ending the slip conditions of the at least one clutch of the downstream transmission, ending the increase of the torque of the electric motor.

Engine starting method

A drivetrain () for a parallel hybrid vehicle has an internal combustion engine (), an electric machine () and a transmission (). The engine () and the electric machine () interact with a common input shaft () of the transmission (). At least one axle of the vehicle can be driven by the internal combustion engine () and/or the electric machine () via an output shaft () of the transmission (). A clutch () is between the internal combustion engine () and electric machine () and can open to decouple the internal combustion engine () from the input shaft () of the transmission (). The clutch () has a first element () for positive locking connection of the electric machine () to the internal combustion engine () and a second element () for frictional locking connection of the electric machine () to the internal combustion engine ().

Drivetrain for a parallel hybrid vehicle

A vehicle has an internal combustion engine, an electric drive device and a transmission with two component transmissions that can be selected simultaneously. Torque can be transmitted from the electric drive device and/or the internal combustion engine to at least one axle of the vehicle, and a torque can be transmitted from the axle to the electric drive device and/or the internal combustion engine. The internal combustion engine is adjusted from a deactivated state to an energized state. Torque is transmitted to the internal combustion engine by the axle and/or the electric drive device via one of two shifting elements to increase rotational speed of the internal combustion engine. The internal combustion engine is adjusted to a target rotational speed via one of the shifting elements. The connection between the internal combustion engine and the axle is produced via one of the shifting elements upon reaching the target rotational speed.

Growing community of inventors

Gerlingen, Germany

Joerg-Michael Birkhold