Torque-control system for automatic speed changer shiftable under load

US4485443A · kind A · utility

Assignee

• Zahnradfabrik Friedrichshafen AG · DE

Inventors

• Dietrich Knodler · Friedrichshafen, DE
• Werner Boes · Friedrichshafen, DE
• Anton Ott · Tettnang, DE
• Kurt O. Venger · Friedrichshafen, DE

Key dates

• Filing date: May 27, 1981
• Grant date: Nov 27, 1984
• Expiry date: May 27, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H61/684
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A system for controlling the torque to be transmitted by a fluid-operated friction coupling (clutch or brake) in an automatic speed changer comprises a processor which receives readings of the rotary speeds of an input member and an output member to be interengaged by that coupling and calculates the instantaneous relative angular acceleration .alpha.=-d.vertline..DELTA.n.vertline./dt from these data, the value .alpha. being supplied to a comparator. A computer receiving the same readings determines the optimum acceleration and feeds the result to the comparator whose output actuates a governor controlling the fluid pressure supplied to the coupling.