Methods and apparatus for controlling shifting processes in a vehicle transmission

US5995896A · kind A · utility

Assignee

• Voith Turbo GmbH & Co. KG · DE

Inventors

• Herbert Depping · Giengen an der Brenz, DE
• Friedrich Haberle · Lauchheim, DE
• Erwin Rotter · Nattheim, DE
• Voker Schempp · Holzmaden, DE
• Wilfried Maier · Eppingen, DE

Key dates

• Filing date: Sep 18, 1997
• Grant date: Nov 30, 1999
• Expiry date: Sep 18, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S477/901
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for the control of shifting processes in a vehicle transmission from an initial gear to the next higher target gear includes the steps of continuously determining the vehicle acceleration (a) and the driven rpm (n.sub.2) behind the vehicle transmission. A shifting process is triggered when the acceleration value (a) and the essentially simultaneously recorded driven rpm value (n.sub.2) fall on a shifting point which lies on a shifting characteristic (n.sub.2 (a)) in an acceleration-driven rpm diagram, where the shifting characteristic (n.sub.2 (a)) has a stepped course with at least two break points (a.sub.-- max; a.sub.-- min) and the slope of the shifting characteristic for acceleration values a.sub.-- min<a<a.sub.-- max is always smaller than or equal to the slope of the shifting characteristic for acceleration values a.ltoreq.a.sub.-- min or a.gtoreq.a.sub.-- max. In other words, the following applies: PA1 .linevert split.n.sub.2 (a.sub.1).linevert split..ltoreq..linevert split.n.sub.2 (a.sub.2).linevert split. where PA1 a.sub.1 .di-elect cons. [a.sub.-- min<a<a.sub.-- max] and PA1 a.sub.2 .di-elect cons. ]a.sub.-- max<a<.infin.[ or PA1 a.sub.2 .di-elect cons. [0<a<a.s…