Method for determining characteristics of an automatic transmission

US9002598B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

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

Key dates

• Filing date: Apr 5, 2012
• Grant date: Apr 7, 2015
• Expiry date: Feb 20, 2033

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2342/044
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method of determining a fill current value of at least one frictionally engaging shift element of an automatic transmission. The automatic transmission includes a hydrodynamic converter at which a speed ratio arises and an output shaft. In a control sequence, with a stationary output shaft, the speed ratio is influenced by changing a control current, and the fill current value is determined from the progression of the speed ratio arising during the control sequence, in conjunction with the progression of the control current.