Apparatus for decreasing jolts during gear shifts in automatic transmissions in motor vehicles

US4403527A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Helmut Mohl · Schwieberdingen, DE
• Alfred Muller · Krefeld, DE
• Manfred Schwab · Gerlingen, DE
• Walter Stroh · Cleebronn, DE

Key dates

• Filing date: Jul 25, 1980
• Grant date: Sep 13, 1983
• Expiry date: Jul 25, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H63/502
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The automatic transmission control unit in a motor vehicle furnishes a signal which signifies that motor torque is to be decreased, thereby decreasing jolts or wear on friction elements in the transmission. In response to this signal, the input or output signals of a motor control unit, for example either an ignition control stage or an injection control stage, are changed in such a way that the motor torque will be decreased. Circuits for delaying ignition timing, shortening the pulse width of injection pulses, etc. are disclosed. The present invention is essentially an adapter unit so that the desired decrease in motor torque can be effected with the injection or ignition timing units already present in the motor vehicle.