Method for determination of characteristics of a transmission

US6779418B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Otto Lutz · Bad Königshofen im Grabfeld, DE
• Markus Eisele · Friedrichshafen, DE
• Harry Nolzen · Tettnang, DE
• Torsten Buchner · Friedrichshafen, DE

Key dates

• Filing date: May 16, 2003
• Grant date: Aug 24, 2004
• Expiry date: May 16, 2023

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 determining characteristic parameter values within a transmission that includes, for example, hydraulically-operated shifting elements, hydro-dynamic brakes, and hydro-dynamic torque converters. Slip regulation is used to determine the actual slip at a transmission element, whose characteristic parameter values are to be determined, before engagement. This element to be adapted is activated by means of pressure application, and thus a specified slip is set that is clearly different from the actual slip at lower torques. The applied pressure or flow may be determined from the set slip, and occurrence of a set slip allows the occurring pressures to be determined.