Procedure for controlling continuous variable transmissions in motor vehicles

US5906649A · kind A · utility

Assignees

• Temic Telefunken Microelectronik · DE
• AUDI AG · DE

Inventors

• Michael Genzel · Roßtal, DE
• Rodolfo Moller · Nürnberg, DE
• Armin Tonn · Roth, DE
• Willem Kuster · Ingolstadt, DE
• Andreas Leicht · Gaimersheim, DE

Key dates

• Filing date: Jan 8, 1997
• Grant date: May 25, 1999
• Expiry date: Jan 8, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H59/42
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A continuously variable transmission in a motor vehicle is regulated using a controller comprising a first control circuit as a speed controller for regulating the transmission input speed as the product calculated from the transmission output speed and the transmission ratio, complete with a summation element at the controller input as well as with a control element, and a second control circuit post-connected to the first control circuit as a speed gradient controller for regulating the time derivative of the transmission input speed, complete with a summation element at the controller input. To preset a variable control response of the controller, different filter functions are defined, in relation to the operating conditions of the motor vehicle, as a fixed relationship between the input quantity control deviation as the difference calculated from nominal and actual values of the transmission input speed and the output quantity nominal gradient value of the transmission input speed, and fed to the control element of the first control circuit, which control element has been designed as a filter element. Depending on the current operating conditions of the motor vehicle, and usin…