System for controlling the pressure of oil in a system for a con

Details System for controlling the pressure of oil in a system for a con System for controlling the pressure of oil in a system for a con

1987-03-27

1988-11-01

Bui, Thuy M.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

74866, 74868, 3644241, 474 12, F16H 1102, B60K 4112

Patent

active

047816554

ABSTRACT:
A control system for a continuously variable transmission has a line pressure control valve having ports and a spool for controlling the line pressure of oil supplied to a cylinder of a driven pulley. The pressure of the oil supplied to control the spool is controlled by an on-off control valve in accordance with engine operating conditions to control the line pressure. The duty ratio of pulses for operating the on-off control valve is obtained by positioning a desired line pressure between the lowest line pressure and the highest line pressure corresponding to duty ratios of 100% and 0%, respectively.

REFERENCES:
patent: 4663991 (1987-05-01), Nakamura et al.
patent: 4672864 (1987-06-01), Morimoto

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