Arrangement for controlling a frictional connection in a gear-changing appliance of an automatic discrete step gearbox of a motor vehicle

US5790967A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Thomas Kull · Waiblingen, DE
• Frank Tietze · Stuttgart, DE

Key dates

• Filing date: Apr 1, 1996
• Grant date: Aug 4, 1998
• Expiry date: Apr 1, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19251
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In an automatic discrete step gearbox of a motor vehicle, the working pressure of a frictional connection (clutch or brake) to be engaged is set at the beginning of a gear-change by an electronic control unit in accordance with a specified required value variation and additionally as a function of correction values. The correction values are determined as a function of deviations between the required transmission torque value and the actual transmission torque value of the frictional connection.