Method for operating an automatic gearbox

US8162796B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Christian Popp · Kreßbronn, DE
• Klaus Steinhauser · Kreßbronn, DE
• Peter Schiele · Kreßbronn, DE
• Bernd Allgaier · Kreßbronn, DE
• Thilo Schmidt · Meckenbeuren, DE

Key dates

• Filing date: Feb 27, 2007
• Grant date: Apr 24, 2012
• Expiry date: Jul 26, 2029

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2200/2043
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for operating an automatic transmission of a motor vehicle, in particular a variable-speed automatic transmission. The automatic transmission has five shift elements and for transferring torque or force in a forward gear and in a reverse gear at least three of the five shift elements are engaged. In a neutral position of the automatic transmission, to prevent torque or force flow at least one of the shift elements that are engaged in the respective forward or reverse gear is fully disengaged.