Control device for belt-and-pulley type continuously variable tr

Details Control device for belt-and-pulley type continuously variable tr Control device for belt-and-pulley type continuously variable tr

1988-08-16

1989-09-19

Bui, Thuy M.

Endless belt power transmission systems or components

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

Fluid pressure actuator for adjustment of member

74866, F16H 1102

Patent

active

048677329

ABSTRACT:
A hydraulic control device for controlling a belt-and-pulley type continuously variable transmission for an automotive vehicle which includes an input and an output shaft, a pair of variable-diameter pulleys provided on the input and output shafts, respectively, a transmission belt connecting the pair of pulleys, and a pair of hydraulic actuators for changing effective diameters of the variable-diameter pulleys. The hydraulic control device further includes a shift control valve device for controlling pressures applied to the hydraulic actuators, to change the speed ratio of the continuously variable transmission over a mechanically defined range, and a controller for applying a drive signal to the shift control valve device. The controller includes a device for limiting a value of the drive signal, so as to prevent the actual speed ratio of the transmission from reaching upper and lower limits of the mechanically defined range.

REFERENCES:
patent: 4152947 (1979-05-01), van Deursen et al.
patent: 4557706 (1985-12-01), Tanaka et al.
patent: 4663990 (1987-05-01), Itoh et al.
patent: 4663991 (1987-05-01), Nakamura et al.
patent: 4704683 (1987-11-01), Osanai
patent: 4772249 (1988-09-01), Kouno et al.

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