Method for operating a vehicle hybrid drive train having an internal combustion engine and having an electric machine

US8465392B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Bernd Allgaier · Kreßbronn, DE
• Michael Sohler · Isny im Allgäu, DE
• Peter Schiele · Kreßbronn, DE

Key dates

• Filing date: Nov 18, 2009
• Grant date: Jun 18, 2013
• Expiry date: Feb 25, 2030

Classification

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

Abstract

A method of operating a vehicle hybrid drive train comprising an internal combustion engine and electric machine whose torque is applicable to a drive output of the drive train. The drive train comprises a clutch arranged between the internal combustion engine and electric machine, an oil pump connected in the drive train downstream of the clutch in relation to the internal combustion engine, and the oil pump can be driven by the internal combustion engine and the electric machine, and a transmission which comprises a shifting elements for producing various gear ratios and which is supplied with hydraulic fluid by the oil pump in an operating-status-dependent manner. The speed of the electric machine is set independently of the speed of the internal combustion engine, in order to supply the transmission with a flow of a volume hydraulic fluid required for the operating point of the transmission present at the time.