Method for controlling rate of change of ratio in a...

Details Method for controlling rate of change of ratio in a... Method for controlling rate of change of ratio in a...

2007-12-04

2007-12-04

Le, David D. (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

C477S037000, C477S043000, C477S054000, C477S068000, C477S107000, C477S110000

Reexamination Certificate

active

11303390

ABSTRACT:
A method for controlling a rate of change of speed ratios in a continuously variable transmission (CVT) includes sensing a vehicle speed, sensing an engine speed, and sensing a change in a position of an accelerator pedal. The method includes determining a desired engine speed based on the change in the position of the accelerator pedal, the vehicle speed, and the engine speed. The method includes increasing a target engine speed at a first rate to a predetermined value, wherein the target engine speed corresponds to a speed ratio. The method includes measuring a difference between the target engine speed that is held at the predetermined value and an actual engine speed, and increasing the target engine speed to the desired engine speed at a second rate when the difference substantially equals a predetermined threshold, wherein the second rate is less than the first rate.

REFERENCES:
patent: 4658360 (1987-04-01), Osanai et al.
patent: 4817469 (1989-04-01), Shigematsu et al.
patent: 5114383 (1992-05-01), Hirano et al.
patent: 6066070 (2000-05-01), Ito et al.
patent: 2006/0035749 (2006-02-01), Kanafani et al.

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