Vehicle transmission comprising a parking brake and method for controlling the same

US7810626B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Peter Schiele · Kreßbronn, DE
• Peter Ziemer · Tettnang, DE

Key dates

• Filing date: Jul 13, 2005
• Grant date: Oct 12, 2010
• Expiry date: May 31, 2027

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2312/12
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A vehicle transmission having shifting elements (A-E) and a parking brake for locking a drive train output and a method for controlling the transmission. Activation of the parking brake depends on a driver's control action. Deactivating the parking brake, when the vehicle is on a slope greater or lesser than a preset value and depending on the slope, a combination of shifting elements (A, D) or (B, D) frictionally slip, such that the output rotates against the strain on a parking brake locking element, caused by the slope, to partially eliminate this strain. Next, one of shifting elements (C, A or B) engages locking the output. The parking brake is then released and finally, the engaged shifting element (C or A or B) is disengaged in a regulated manner, such that the output can be driven according to the driver's control action.