Method for determining the rotational speed of a part, ascertaining the slipping of a continuously variable transmission (CVT), and for controlling a CVT, and a conical disc flexible drive transmission

US7603893B2 · kind B2 · utility

Assignee

• LuK Lamellen und Kupplungsbau Beteiligungs KG · DE

Inventors

• Franz Bitzer · Friedrichshafen, DE
• Martin Vornehm · Neu-Anspach, DE
• Christian Lauinger · Baden-Baden, DE
• Michael Reuschel · Ottersweier, DE
• Christian Späth · Baden-Baden, DE
• Christoph Angele · Birkenfeld, DE
• Thomas Pfund · Leiberstung, DE
• André Linnenbrügger · Bogen, DE

Key dates

• Filing date: Apr 10, 2003
• Grant date: Oct 20, 2009
• Expiry date: Feb 24, 2025

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2059/704
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The input rotational speed of a belt-driven conical-pulley transmission is determined by measuring a wheel rotational speed and the transmission ratio and by calculating the input rotational speed therefrom. In order to ascertain the slipping of a CVT transmission, the rate of change in the transmission ratio is drawn upon, or an acoustic parameter of the transmission is used. In the fluid control system, a valve is used whose opening cross-section is controlled according to the one differential pressure. In order to oil the conical discs, injection holes of an injection tube are used that passes through a slot provided in a slide rail resting against a strand of a flexible torque transmitting member of a conical disc flexible drive.