Method and control unit for operating a drivetrain of a motor vehicle comprising a power take-off

US11339862B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Ulf Lang · Friedrichshafen, DE
• Markus Eisele · Friedrichshafen, DE
• Ralf Baus · Friedrichshafen, DE
• Friedrich Reiter · Kreßbronn, DE

Key dates

• Filing date: Oct 21, 2020
• Grant date: May 24, 2022
• Expiry date: Nov 11, 2040

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2200/0004
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for operating a drive-train of a motor vehicle. The drive-train having a transmission connected between a drive aggregate and a drive output. A hydrodynamic starting element is connected between the drive aggregate and transmission. The starting element includes a converter and converter lock-up clutch. A Power Take-Off (PTO) can be coupled to the drive aggregate on the drive aggregate side to take up drive torque delivered by the drive aggregate. In order to determine the torque taken up by the PTO, the lock-up clutch is operated in a rotational-speed-regulated manner at least when the PTO is coupled to the drive aggregate in order to set a defined target slip at the lock-up clutch. As a function of the actuation pressure of the lock-up clutch required for setting the target slip when the PTO is coupled, the torque taken up by the PTO is determined.