Shift control method of continuously variable transmission

Details Shift control method of continuously variable transmission Shift control method of continuously variable transmission

1991-02-28

1992-07-21

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

3644241, F16H 1106

Patent

active

051312972

ABSTRACT:
A shift control method is provided for controlling shifting in a continuously variable transmission. The transmission changes a gear ratio by increasing or decreasing the turning radius of a belt installed on a pair of pulleys. Each pulley includes a fixed pulley member and a movable pulley member, and the belt turning radius is varied by varying the width of a groove defined between the respective pulley members. The transmission has a shift control range associated therewith which is determined on the basis of the component structural elements thereof, and this shift control range is bounded by a ratio line. The shift control method includes providing a control means for setting a target engine speed according to input throttle opening and vehicle speed information, and setting a limit value of said target engine speed in the vicinity of the ratio line but outside of the shift control range.

REFERENCES:
patent: 4663990 (1987-05-01), Itoh et al.
patent: 4743223 (1988-05-01), Tekero et al.
patent: 4767382 (1988-08-01), Tezuka et al.
patent: 4811225 (1989-03-01), Petzold et al.
patent: 4867732 (1989-09-01), Soga et al.
patent: 4913005 (1990-04-01), Ishikawa et al.

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