Hydraulic control apparatus for a continuously variable transmis

Details Hydraulic control apparatus for a continuously variable transmis Hydraulic control apparatus for a continuously variable transmis

1997-10-14

1999-03-30

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 46, 474 28, F16H 6324, F16H 910

Patent

active

058881689

ABSTRACT:
A hydraulic control apparatus for a continuously variable transmission which can produce stable drive pulley pressure and driven pulley pressure and also control the speed change time. The line pressure regulated by the regulator valve 22 is supplied to the control valve 24.sub.DR of the drive pulley 5 and to the control valve 24.sub.DN of the driven pulley 7. These control valves regulate the line pressure according to the PB pressure and the PC pressure output from the solenoid valves SOL-B, SOL-C, respectively, and produce the drive pulley pressure P.sub.DR and the driven pulley pressure P.sub.DN. When the PB pressure and the PC pressure are both zero, and P.sub.DR =P.sub.DN, the control apparatus maintains the same gear ratio. When the PB pressure is increased from zero while keeping the PC pressure at zero, i.e. P.sub.DR >P.sub.DN, the gear ratio changes toward the high-speed overdrive. When the PC pressure is increased from zero while holding the PB pressure at zero, i.e. P.sub.DR <P.sub.DN, the gear ratio changes toward the low-speed gear.

REFERENCES:
patent: 4680990 (1987-07-01), Ohgami
patent: 4721019 (1988-01-01), Nakamura et al.
patent: 4790214 (1988-12-01), Hattori et al.
patent: 5319999 (1994-06-01), Morishigo et al.

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