Technique for clutch control in continuously variable transmissi

Details Technique for clutch control in continuously variable transmissi Technique for clutch control in continuously variable transmissi

1989-08-31

1991-04-16

Bonck, Rodney H.

192 clutches and power-stop control

Transmission control and clutch control

192 363, 74866, B60K 4122

Patent

active

050075128

ABSTRACT:
An improved clutch control system in a continuously variable transmission driven vehicle monitors driver selection of forward or reverse and implements the specific parameters for each. The control logic provides a preselected time interval for sensing of a pressure drop associated with the transition from one operating mode to another, such as from neutral to forward. The system provides for sensing that pressure drop and providing a desired fluid flow rate for clutch actuation consistent with the desired performance. The system also monitors pressure in the fluid actuation system at the end of the predetermined interval to ascertain when the pressure reaches a desired higher level indicative of a control characteristic to provide desired vehicle response to driver demand. Fluid flow to the clutch is controlled at a corresponding rate to provide a desired operating characteristic and to facilitate transition into a subsequent vehicle operating mode. Length of time frame for the associated timer depends upon characteristics of specific engines. The timer times out in a time normally required for reaching the desired, second pressure level to allow transition to subsequent operating mode.

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