Method for starting a piston engine and hybrid drive for performing the method

US8047959B2 · kind B2 · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Martin Fuechtner · Stuttgart, DE
• Dieter Kraxner · Wurmberg, DE
• Markus Goehring · Herrenberg, DE
• Marco Fleckner · Leonberg, DE
• Nils Sauvlet · Bad Essen, DE

Key dates

• Filing date: Jan 8, 2008
• Grant date: Nov 1, 2011
• Expiry date: Sep 2, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/64
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method is provided for starting a piston engine of a hybrid drive in an electric travel state. The hybrid drive includes at least the piston engine, an electric motor, a transmission, and a clutch situated between the piston engine and the electric motor. A converter lockup clutch, which is switchable into a slip state, is also provided. A slip is set at the converter lockup clutch, and a speed of the electric motor is then increased. The speed and the torque either do not change or only change in a predefined range at the output side of the converter lockup clutch. The clutch is closed to transmit a torque pulse, so that a first top dead center of the piston of the piston engine may be overcome. A predefined slip is then set at the clutch.