Control system for belt-type continuously variable transmission

Details Control system for belt-type continuously variable transmission Control system for belt-type continuously variable transmission

1993-09-30

1995-06-27

Buiz, Michael Powell

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

474 69, F16H 5900

Patent

active

054275792

ABSTRACT:
A belt-type continuously variable transmission has a drive pulley coupled to an input shaft, a driven pulley coupled to an output shaft, a V-belt trained around the drive and driven pulleys, a drive-pulley cylinder for varying the pulley width of the drive pulley, and a driven-pulley cylinder for varying the pulley width of the driven pulley. The belt-type continuously variable transmission is controlled by a control system including a high-pressure regulator valve for producing high-pressure control oil under a high control pressure, a low-pressure regulator valve for producing low-pressure control oil under a low control pressure which is lower than the high control pressure, a shift valve for selectively supplying the high-pressure control oil and the low-pressure control oil to the drive-pulley cylinder and the driven-pulley cylinder, and a shift controller for controlling the shift valve to move in a direction to eliminate an difference between a target speed ratio control value and a present speed ratio control value from a reference position in which an axial thrust force ratio between an axial thrust force required to be applied by the drive-pulley cylinder and an axial thrust force required to be applied by the driven-pulley cylinder to keep a present speed ratio i constant.

REFERENCES:
patent: 5169366 (1992-12-01), Reniers
patent: 5183439 (1993-02-01), Yumoto et al.
patent: 5273492 (1993-12-01), Kashiwase et al.
English language of Japanese Abstract 62-196447; Aug. 1987.

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