System for controlling a continuously variable transmission havi

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

1990-11-02

1991-10-22

Bui, Thuy M.

Endless belt power transmission systems or components

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

Load responsive

474 28, F16H 5900

Patent

active

050591576

ABSTRACT:
A continuously variable belt drive transmission has a torque converter with a lockup clutch. The lockup clutch is engaged in accordance with conditions of an engine and the transmission. Torque of the torque converter is estimated based on engine operating conditions and transmission conditions, and torque of the lockup clutch is estimated based on engine operating conditions and detected transmission conditions. The estimated converter torque and the estimated clutch torque are compared with each other for determining larger torque. The lockup clutch is disengaged when the estimated converter torque is larger than the estimated lockup clutch torque.

REFERENCES:
patent: 4781655 (1988-11-01), Tezuka
patent: 4850935 (1989-07-01), Morimoto
patent: 4923433 (1990-05-01), Tanaka et al.

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