Method for shifting actuation of an automated transmission

US7878942B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Josef Bader · Friedrichshafen, DE
• Andreas Graf · Gottmadingen, DE
• Martin Miller · Markdorf, DE
• Mario Steinborn · Friedrichshafen, DE
• Thomas Hafen · Salem, DE

Key dates

• Filing date: Sep 9, 2008
• Grant date: Feb 1, 2011
• Expiry date: Sep 9, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19251
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for shifting an automated transmission situated in a drive train of a motor vehicle between an engine and a drive axle and having at least one multi-speed main transmission and a two-speed range change group rear-mounted thereon. The main transmission has at least one counter-shaft with an transmission brake. A clutch engages the prime mover and the main transmission and the range change group is shifted via unsynchronized dog clutches, which are combined in pairs in a common shift set having two shift positions and one neutral position such that during a range change gearshift, both in the main transmission and in the range change group, a change between two ratio stages occurs. A range change up-shift and down-shift each include active synchronization of the dog clutch by way of the transmission brake and of the separating clutch.