Method of operation of a drive unit and device for execution of the method

US5730682A · kind A · utility

Assignee

• Voith Turbo GmbH & Co. KG · DE

Inventors

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

Key dates

• Filing date: May 10, 1996
• Grant date: Mar 24, 1998
• Expiry date: May 10, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0096
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention concerns a method for operation of a drive unit of a vehicle, including a drive machine and a transmission with at least two gears. A quantity that characterizes acceleration of the vehicle and a quantity that characterizes the power of the drive engine are continuously determined. A gear shift speed range and a second speed range bounded by a lowest and highest attainable speed in the target gear can be established for a gear shift process in the initial gear. The gear shift speed range is bounded at least by a lower gear shift speed and an upper gear shift speed and the second speed range is bounded by a lower target speed, as well as an additional speed. The gear shift process is initiated as a function of the determined acceleration. The lower target speed is achieved in a gear shift process in a first limiting stage (high acceleration at low input speeds or limited deceleration at low input speeds) during initiation of a gear shift at a number of gear shift speeds. The gear shift process between the first limiting state and the highest attainable speed in the target gear is initiated as a function of the determined quantities in the gear shift speed range in the …