Method and an arrangement for controlling an automatic transmission

US5514051A · kind A · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Gerhard Heid · Leonberg, DE
• Willi Seidel · Lambach, DE

Key dates

• Filing date: Jul 18, 1994
• Grant date: May 7, 1996
• Expiry date: Jul 18, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S477/904
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method and an arrangement for controlling an automatic transmission of a motor vehicle driven by an internal-combustion engine, in which the position of a throttle valve of the motor vehicle and the acceleration of the vehicle as the reaction thereto are determined and are related to one another. Subsequently, this relationship is compared with the relationship as it occurs during a normal drive on a level surface. As a function of the deviation between the actual relationship and the normal relationship, the ratios of the transmission are displaced in the direction of higher rotational engine speeds, which means that the ratio assigned to a throttle valve position and to a rotational engine speed will now be achieved at a lower rotational engine speed, or the rotational engine speed level is raised. For a stepped transmission, several characteristic shifting diagrams are provided and the displacement of the ratio is carried out by changing the characteristic shifting diagram according to the deviation. For a continuous transmission, which has several characteristic control curves, the displacement of the ratio is carried out by a change of the characteristic control curve accord…