Control method and system for an infinitely variable automatic automobile transmission

US6718247B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Friedrich Graf · Eggenfelden, DE
• Kai Heesche · Munich, DE

Key dates

• Filing date: Apr 23, 2001
• Grant date: Apr 6, 2004
• Expiry date: Apr 23, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0081
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In the method, the transmission ratio of the speed transmission (i_act) is set automatically using stored adjustment characteristic curves, as a function of a variable (FP, tv) which characterizes the engine output, and a variable (v) which characterizes the vehicle speed. The transmission ratio is varied as required by means of a manual intervention by the driver. The transmission ratio of the speed transmission is set as a stepped deviation from a setpoint engine speed (n_eng).