Variable control device for a continuously variable transmission

Details Variable control device for a continuously variable transmission Variable control device for a continuously variable transmission

1998-09-01

2000-03-28

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

701 61, F16H 6100

Patent

active

060425016

ABSTRACT:
A variable control device which controls the rotations of a step motor in a continuously variable transmission and maintains the variable ratio is provided with a feed back control system and a feed forward control system. These control systems are switched on the basis of the driving conditions. The feed back control is provided with an actual pulley compensator 108b which calculates the external disturbance compensation from the actual pulley ratio (Aip) and a command value external disturbance compensator 108a which calculates the external disturbance compensation from the command pulley ratio. When switching from open loop control to feed back control, the actual pulley ratio compensator 108b is initialized to the actual variable ratio (Aip). On the other hand, the command value compensator 108a is initialized to the command pulley ratio (ip.sub.R). Hence it is possible to prevent the command pulley ratio from varying greatly immediately after switching and control the generation of variable shocks when transferring from open loop control to feed back control.

REFERENCES:
patent: 4670843 (1987-06-01), Matsumura et al.

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