Method of operating a vehicle transmission

US6095948A · kind A · utility

Assignee

• Playtex Products, LLC · US

Inventors

• Herbert Depping · Giengen an der Brenz, DE
• Wilfried Maier · Eppingen, DE
• Erwin Rotter · Nattheim, DE
• Friedrich Haberle · Lauchheim, DE
• Thomas Schonhaar · Oberkochen, DE

Key dates

• Filing date: Oct 21, 1998
• Grant date: Aug 1, 2000
• Expiry date: Oct 21, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0087
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A process is provided for operating a vehicle transmission with preferably electrohydraulically actuatable friction elements for shifting between different transmission steps, in a vehicle with at least one drive engine in which an actual value of at least one of the quantities characterizing the shift process is determined for each shift process, which actual value is compared with a theoretical value that can be established and stored. When the actual value deviates from the theoretical value, a regulated quantity for at least direct influencing is changed by a correction value that can be established. For each shift process, the time duration for the output of a gear shift signal up to the beginning of the synchronization process and/or the change of the drive rpm during this time period is determined as a first and/or second actual value of the quantity characterizing the process. When the time period up to the beginning of the synchronization process deviates from the pre-given theoretical time period or if the drive rpm change given in advance is not achieved after a shift process, the initial pressure value is changed by the correction value in order to introduce the necessa…