Method and apparatus for controlling an automatic shift transmission

US5025684A · kind A · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Heinz Stehle · Marloffstein, DE
• Thomas Wehr · Ditzingen, DE
• Joseph Petersmann · Wimsheim, DE
• Willi Seidel · Lambach, DE
• Ludwig Hamm · Sindelfingen, DE
• Thomas Foeldi · Stuttgart, DE
• Gerhard Eschrich · Tettnang, DE
• Ronald Schwamm · Gerlingen, DE
• Wolfgang Runge · Ravensburg, DE
• Wolf-Dieter Gruhle · Tettnang, DE
• Peter Wendel · Saint Joseph, US

Key dates

• Filing date: Jul 5, 1990
• Grant date: Jun 25, 1991
• Expiry date: Jul 5, 2010

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H61/21
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In order to improve the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission particularly during cornering and braking, the driving speed (v), the lateral acceleration (aq), and the time variation of the throttle valve position are sensed in addition to the throttle valve position (alpha) and the engine rotational speed (nmot). From the time variation of the throttle valve position, a signal can be derived for the prevention of an upshifting operation since a motor vehicle driver's foot moves away faster from the accelerator pedal when approaching a bend in the road than would be the case for the normal deceleration of the motor vehicle.