Method for operating a vehicle drive train having a driving machine and having a transmission apparatus having a plurality of shift elements

US8652004B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Valentine Herbeth · Friedrichshafen, DE
• Jörg Arnold · Markdorf, DE
• Georg Mihatsch · Gettorf, DE
• Thilo Schmidt · Meckenbeuren, DE
• Klaus Steinhauser · Kreßbronn, DE

Key dates

• Filing date: Dec 21, 2010
• Grant date: Feb 18, 2014
• Expiry date: Feb 1, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2312/14
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method of operating a vehicle drive train having a drive machine, a transmission apparatus having a plurality of shift elements and an output drive. The plurality of shift elements are engaged or disengaged in a power flow for achieving different transmission ratios within the transmission apparatus. The output drive is coupled to a transmission output shaft and the drive machine is coupled to a transmission input shaft of the transmission apparatus. Upon a request to interrupt power flow within the transmission apparatus, between the transmission input shaft and the transmission output shaft, a maximum number of shift elements are transferred to and/or held in an engaged operating state, and the remaining portion of the shift elements are transferred to and/or held in a disengaged operating state with the transmission output shaft being rotatable.