Method for controlling a separating clutch in a hybrid drive train, and drive train

US9108637B2 · kind B2 · utility

Assignee

• Schaeffler Technologies AG & Co. KG · DE

Inventors

• Willi Ruder · Lahr (Eifel), DE
• Martin Dilzer · Laufenburg (Baden), DE

Key dates

• Filing date: Jan 9, 2014
• Grant date: Aug 18, 2015
• Expiry date: Jan 9, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S903/902
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hybrid drivetrain and method for controlling a friction clutch of a hybrid drivetrain of a motor vehicle having a combustion engine which is coupled by means of a freewheel to a transmission input shaft of a transmission to transmit the engine torque, and having an electric machine which starts the combustion engine and/or propels the motor vehicle, which friction clutch transmits to the combustion engine a summed torque formed of a starting torque for starting the combustion engine by means of the electric machine and a drag torque which acts on the combustion engine when the drivetrain is in drag mode. To be able to operate the friction clutch reliably and to avoid over-dimensioning of the friction clutch as a result of high summed torques, a torque present at the friction clutch is limited to a predefined transmission torque which can be transmitted via the friction clutch.