Method for operating an automatic gearbox

US7957869B2 · 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: Jun 7, 2011
• Expiry date: Jul 8, 2028

Classification

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

Abstract

A method of operating an automatic transmission of a motor vehicle, in particular a variable-speed transmission. The automatic transmission includes at least five shift elements, at least three of which are engaged in a forward and a reverse gear to transfer torque or force. When disengaging gears for shifting the automatic transmission from a forward or reverse gear to a neutral position, at least one of the at least three shift elements that are engaged in the respective forward or reverse gear is completely disengaged.