System for controlling a continuously variable transmission

Details System for controlling a continuously variable transmission System for controlling a continuously variable transmission

1991-02-14

1992-05-12

Bui, Thuy M.

Endless belt power transmission systems or components

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

Load responsive

F16H 5900

Patent

active

051122804

ABSTRACT:
A power transmitting system has a belt drive continuously variable transmission for transmitting power of an engine to wheels of a motor vehicle through a torque converter with a lockup clutch. The transmission comprises a primary pulley connected to an output member of the torque converter, a secondary pulley operatively connected to the wheels, a primary cylinder and a secondary cylinder for changing effective diameters of both pulleys, a secondary pressure control valve for controlling secondary pressure applied to the secondary cylinder. Vehicle driving conditions for engaging and disengaging the lockup clutch are detected for producing an engagement or a disengagement signal. In response to the engagement signal, the locked up clutch is locked and the secondary pressure is reduced after a predetermined delay time. In response to the disengagement signal, the secondary pressure is increased and the lockup clutch is disengaged after a predetermined delay time.

REFERENCES:
patent: 4658360 (1987-04-01), Osanai et al.
patent: 4674363 (1987-06-01), Miyawaki
patent: 4734082 (1988-03-01), Tezuka
patent: 4850935 (1989-07-01), Morimoto

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