Method and device for operating a drive unit

US8423251B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dirk Hartmann · Aßling, DE
• Georg Mallebrein · Stuttgart, DE
• Werner Mezger · Weinsberg, DE
• Andreas Roth · Karlsruhe, DE
• Henri Barbier · Schwieberdingen, DE
• Nikolas Poertner · Stuttgart, DE
• Frank Schiller · Amberg, DE
• Juergen Rappold · Beilstein, DE
• Ingo Fecht · Ludwigsburg, DE

Key dates

• Filing date: Aug 1, 2006
• Grant date: Apr 16, 2013
• Expiry date: Aug 14, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/84
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method and a device are provided for operating a drive unit having an engine and a transmission, which make possible an improved shifting strategy. In a first operating state, the engine is operated using a first number of active cylinders. In a second operating state, the engine is operated using a second number of active cylinders. The first number is different from the second number. A gear ratio is set as a function of at least one operating variable of the drive unit. The gear ratio is also set as a function of the current or the attainable operating state of the engine with respect to the number of the active cylinders.