Method of controlling clutch pressure of continuously variable t

Details Method of controlling clutch pressure of continuously variable t Method of controlling clutch pressure of continuously variable t

1988-08-08

1989-08-15

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

192 358, 3644241, B60K 4116

Patent

active

048563803

ABSTRACT:
A method of controlling clutch pressure in a continuously variable transmission system which can expand and contract the width of a channel between a stationary pulley member and a movable pulley member movable relative to the stationary pulley member in order to respectively contract and expand a radius of travel about the pulleys of a belt engaging the pulleys before eventually varying a belt ratio, a clutch-pressure control arrangement of the continuously variable transmission system including a controller unit which effects control by feeding an actually-detected clutch pressure back in determining an objective clutch pressure and including an oil-pressure circuit which controls oil pressure in response to signals from the controller unit; the method comprising the step of: causing the controller unit to calculate a clutch duty ratio in reference to the objective clutch pressure and an objective line pressure when a pressure sensor detecting the actually-detected clutch pressure outputs an abnormal signal before eventually causing the controller unit to control the clutch pressure in accordance with the calculated clutch duty ratio.

REFERENCES:
patent: 4393732 (1983-07-01), Suzuki et al.
patent: 4660440 (1987-04-01), Matsumura et al.
patent: 4662488 (1987-05-01), Hiramatsu et al.
patent: 4664235 (1987-05-01), Yokoyama et al.
patent: 4724724 (1988-02-01), Tezuka
patent: 4725951 (1988-02-01), Niikura
patent: 4744269 (1988-05-01), Greene et al.
patent: 4764156 (1988-08-01), Ohkumo

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