Method for controlling an automatic transmission and controller suitable for such a method

US6684143B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Friedrich Graf · Eggenfelden, DE
• Tibor Kiss · Regensburg, DE
• Martin Lachmayr · Regensburg, DE
• Bernd Last · Reutlingen, DE
• Stefan Lauer · Erlangen, DE
• Martin Manz · Birkenfeld, DE
• Stephan Pindl · Ergoldsbach, DE
• Tanja Roy · Burglengenfeld, DE

Key dates

• Filing date: Apr 3, 2002
• Grant date: Jan 27, 2004
• Expiry date: Jun 10, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2306/18
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for controlling an automatic transmission in a drive train of a motor vehicle having a transmission controller selecting and shifting gears of the transmission includes determining a new gear by reference to gear shift characteristic curves and generating a gear shift instruction as soon as a working point of the drive train exceeds a gear shift characteristic curve. The transmission controller determines a new gear that is expected to be engaged shortly. If the new gear differs from the current gear, an initial phase of the gear shift is carried out and the gear shift is completed as soon as the gear shift instruction has been generated. The initial phase is carried out as soon as the working point drops below a predefined distance from the gear shift characteristic curve.