Method and apparatus for controlling a continuously variable tra

Details Method and apparatus for controlling a continuously variable tra Method and apparatus for controlling a continuously variable tra

1983-05-19

1985-07-02

Novosad, Stephen J.

Endless belt power transmission systems or components

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

Load responsive

474 17, 74857, 74861, F16H 1106, F16H 4700, B60K 4114, B60K 4122

Patent

active

045265577

ABSTRACT:
A continuously variable transmission includes a hydrodynamic device, such as a fluid coupling or a torque converter, having a lock-up clutch. The reduction ratio of the continuously variable transmission is controlled by a shift motor. The shift motor is controlled such that each of rotary positions thereof corresponds uniquely to a desired optimum reduction ratio. Upon detecting a state wherein a rapid down shift is needed, the lock-up clutch is temporarily disengaged to allow the hydrodynamic device to slip during the rapid down shift.

REFERENCES:
patent: 4291594 (1981-09-01), Baudoin
patent: 4387608 (1983-06-01), Mohl et al.

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