Method and apparatus for control of gear changing under load in a transmission

US4584905A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Eschrich · Tettnang, DE
• Alfred Muller · Krefeld, DE
• Joseph Sauer · Strullendorf, DE
• Achim Schreiber · Schwieberdingen, DE

Key dates

• Filing date: Apr 11, 1983
• Grant date: Apr 29, 1986
• Expiry date: Apr 11, 2003

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H59/38
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method and an apparatus are proposed for control of gear changing under load in a transmission of a vehicle driven by an internal combustion engine. In all gear changing instances, the hydraulic pressure upon the frictionally engaged elements is established with a constant slippage time proportionally to the sum of the engine torque and the product of the engine speed and a constant factor. The constant factor depends on the slippage time and on the gear changing instance (FIG. 1).