Method for controlling gear-shifting processes of a powershift gearbox and corresponding powershift gearbox

US7367924B2 · kind B2 · utility

Assignee

• LuK Lamellen und Kupplungsbau Beteiligungs KG · DE

Inventors

• Reinhard Berger · Bühl, DE
• Gunter Hirt · Steinach, DE
• Alexander Schweizer · Laufenburg (Baden), DE
• Boris Serebrennikov · Laufenburg (Baden), DE
• Lidvar Budal · Kongsberg, NO
• Brad Shellhammer · Bogen, DE
• Jeremy Whitmer · Bogen, DE
• Dietmar Lang · Regenstauf, DE

Key dates

• Filing date: Mar 31, 2005
• Grant date: May 6, 2008
• Expiry date: Jan 1, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19274
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for controlling gear-shifting processes of a powershift gearbox which can be coupled to a drive motor and has gear steps including two friction clutches and a plurality of clutches, and at least one gearbox actuator for actuating the gear steps. The method includes the following steps: the torque of the drive motor is received by the new friction clutch associated with the new gear step to be engaged; before the disengagement of the old gear step and before or during the torque reception, a pre-determined pre-tensioning force is applied to the clutch of the old gear step by the gearbox actuator; and the old gear step is disengaged when the motor torque and the clutch torque are balanced.