Continuously variable transmission and control

Details Continuously variable transmission and control Continuously variable transmission and control

1997-08-27

1999-07-20

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

701 61, B60K 4112

Patent

active

059249544

ABSTRACT:
A continuously variable transmission control system determines the desired speed ratio for a continuously variable transmission from various input data received from the vehicle and operator. The desired speed ratio is compared with a commanded speed ratio to provide an error signal which establishes a new commanded speed ratio for the continuously variable transmission. The comparing process of desired speed ratio to commanded speed ratio is repeated until the error signal is substantially null. Also, the control provides an adaptive modifier for the actuator of the continuously variable transmission such that a comparison of actual transmission ratio to commanded speed ratio will determine if an adaptive modification is necessary. The control further provides a step control function which is operable when the ratio of the continuously variable transmission is moving toward an underdrive ratio. The step input commands a large change in the actuator control valve to thereby accommodate reducing the pressure in the controls of the continuously variable transmission and thereby change the ratio rapidly.

REFERENCES:
patent: 5062049 (1991-10-01), Taylor
patent: 5175685 (1992-12-01), Hibi
patent: 5218541 (1993-06-01), Sakakibara et al.
patent: 5558596 (1996-09-01), Adachi et al.
patent: 5788599 (1998-08-01), Adachi et al.
patent: 5803862 (1998-09-01), Ochiai et al.

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