Method of controlling clutch of continuously variable transmissi

Details Method of controlling clutch of continuously variable transmissi Method of controlling clutch of continuously variable transmissi

1988-08-08

1991-06-11

Herrmann, Allan D.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, 192 358, 192103F, 192109F, B60K 4114, B60K 4122

Patent

active

050222872

ABSTRACT:
A method of controlling a clutch of a continuously variable transmission system which controls a transmission system by either expanding or contracting the width of a channel between a stationary pulley member and an axially movable pulley member to expand or contract the radius of rotation of a belt wound on the pulleys to eventually vary the belt ratio. The continuously variable transmission system includes a controller unit which executes a control operation by feeding actually detected clutch pressure back to an objective clutch pressure, and an oil-pressure circuit which controls oil pressure in response to signals from the controller unit. The control system implements the sequential steps of (a) delivering a variety of signals denoting the status of the driven vehicle to said controller unit, and (b) causing the controller unit to output signals to the oil-pressure circuit when the controller unit identifies the presence of a hold mode before eventually causing the oil-pressure circuit to control the clutch pressure to a predetermined level.

REFERENCES:
patent: 4616530 (1986-10-01), Tanaka et al.
patent: 4648496 (1987-03-01), Petzold et al.
patent: 4714145 (1987-12-01), Kurihara et al.
patent: 4765450 (1988-08-01), Kurihara et al.
patent: 4793454 (1988-12-01), Petzold et al.
patent: 4807132 (1989-02-01), Arai et al.
patent: 4858498 (1989-08-01), Bouda

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