Continuously variable transmission line pressure control

Details Continuously variable transmission line pressure control Continuously variable transmission line pressure control

1989-10-17

1991-10-29

Cangialosi, Salvatore

Boots, shoes, and leggings

74866, 192 358, B60K 4122

Patent

active

050620509

ABSTRACT:
A line pressure control system for a continuously variable transmission which includes a continuously variable member, a clutch and a pressure transducer for providing a feedback signal for both closed loop line pressure and closed loop clutch control. The line pressure control system includes a closed loop control strategy and an open loop control strategy which operate independently, and initial conditions are determined and set to prevent discontinuities in the output. The closed loop control strategy includes proportional and integral gain terms. The control system is adaptable to utilize of a variety of different open loop control strategies to provide a schedule response to a desired line pressure or a maximum or minimum line pressure when appropriate. The control system also optionally provides for a transition from closed loop control to open loop control and vice versa in response to the output parameters generated.

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