Method for control of an automatic transmission of a motor vehicle

US5549519A · kind A · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Willi Seidel · Lambach, DE
• Joseph Petersmann · Wimsheim, DE

Key dates

• Filing date: Dec 21, 1993
• Grant date: Aug 27, 1996
• Expiry date: Dec 21, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/163
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for control of a preferably electro-hydraulically activated automatic transmission of a motor vehicle equipped with an internal combustion engine provides for prevention of upshifting, i.e. reduction in translation in and before a curve. The upshift prevention is initiated if pressure is removed quickly from the gas pedal in idle operation. The upshift prevention is cancelled if the vehicle does not drive through a curve after elapse of a certain time period after traction operation is recognized. If idle operation is again recognized during elapse of the time period, the upshift prevention is maintained for another time period. After termination of the upshift prevention, step by step adjustment of the gear level to the value determined by the shifting characteristic field takes place.