Methods for regulating the gear ratio of an automatic power-branched transmission, and automatic power-branched transmission

US7493203B2 · kind B2 · utility

Assignee

• LuK Lamellen und Kupplungsbau Beteiligungs KG · DE

Inventors

• Franz Bitzer · Friedrichshafen, DE
• Christian Lauinger · Baden-Baden, DE
• Michael Reuschel · Ottersweier, DE
• Martin Vornehm · Neu-Anspach, DE
• Andre Teubert · Bogen, DE
• Manfred Homm · Bühl, DE
• Eric Muller · Contz-les-Bains, FR
• Reinhard Stehr · Bogen, DE
• Bernhard Walter · Oberkirch, DE

Key dates

• Filing date: Jan 27, 2003
• Grant date: Feb 17, 2009
• Expiry date: Aug 26, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/6616
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for regulating or controlling the transmission ratio of an automatic power-branched transmission. Power is transmitted through a shaft driven by an engine, a variable speed drive, a gear transmission, a driven shaft, and at least two control clutches. The variable speed drive and the gear transmission are connected to each other in such a way that the regulating range of the variable speed drive is traversed in one direction within a first range of transmission ratios, and is traversed in the opposite direction within a second range of transmission ratios during traversing of the entire range of transmission ratios. The shifting strategies result in reduced wear of the endless belt device and allow for comfortable changing between the transmission ratio ranges.