Method for controlling a continuously variable transmission

Details Method for controlling a continuously variable transmission Method for controlling a continuously variable transmission

2005-09-06

2005-09-06

Pang, Roger (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

C701S061000

Reexamination Certificate

active

06939264

ABSTRACT:
The transmission ratio of a stepless transmission is adjusted in accordance with a selectable closed loop control strategy, whereby the transmission ratio is infinitely variable between two transmission ratio end values by actuator forces effective on axially adjustable bevel discs forming part of the stepless transmission. High end position forces on the bevel discs in their end positions are limited, yet the entire control range of the bevel discs may be used. For this purpose the transmission ratio is modulated in an end position operating mode by modulating the actuator forces that axially shift the bevel discs. The actuator forces are controlled in a closed loop manner.

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