Method of controlling a continuously variable transmission automatically or as a driver-controlled manual stepped transmission

US6086506A · kind A · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Joseph Petersmann · Wimsheim, DE
• Willi Seidel · Lambach, DE
• Heinz Stehle · Marloffstein, DE
• Werner Mollers · Wiernsheim, DE
• Uwe Froschke · Wimsheim, DE

Key dates

• Filing date: Apr 8, 1997
• Grant date: Jul 11, 2000
• Expiry date: Apr 8, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19251
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for controlling a continuously variable transmission with an electrohydraulic control, a selector device, and a controllable engaging clutch of a motor vehicle, especially one powered by an internal combustion engine, with a control device in a first operating mode automatically selecting and adjusting a gear ratio for the transmission from signals of the selector device and the operating parameters of the motor vehicle such as the throttle angle, driving speed and engine rpm, by means of curves selectable by the driver. It is proposed, in a second operating mode, to simulate a multi-step transmission influenceable directly by the driver. In order to permit use of this operating mode, only a few preset gear ratios are made available to the driver. In addition, from the operating parameters of the vehicle, but at least from a throttle signal value, as described in DE-OS 39 22 051, a parameter called driving activity SK(t) is obtained which evaluates the driving style of the driver or his behavior as a function of traffic situations relative to the control of the motor vehicle. The preset gear ratios are combined in groups. Depending on the driving a…